2024-03-28T19:00:59Zhttp://nur.nu.edu.kz/oai/requestoai:nur.nu.edu.kz:123456789/23662018-08-15T03:50:27Zcom_123456789_127col_123456789_2364
2017-03-29T03:52:47Z
urn:hdl:123456789/2366
КОРПОРАТИВНЫЕ R&D ЦЕНТРЫ: Платформа для устойчивого роста бизнеса
Жакупов, А. Б.
Султангазин, Б. Н.
Утегулов, А. К.
Тулегенова, Г. Е.
Алтынбеков, А. А.
инновационные проекты
корпоративные центры исследований и разработок
корпоративные R&D центры
Настоящий обзор посвящен анализу деятельности корпоративных центров исследований и разработок (R&D) в мире. В частности,
проведен сравнительный анализ различных моделей корпоративных R&D, включающий в себя описание эволюции данных моделей
за последние 60 лет, опыт применения принципов открытых инноваций и реализации инновационных стратегий компаний. В обзоре
также рассмотрены актуальные вопросы организации R&D деятельности в крупных компаниях, такие, как модель управления R&D,
управление портфелем инновационных проектов, вопросы коммерциализации результатов исследований и разработок, проблемы,
связанные с инфраструктурой и расположением R&D центра, и, один из самых важных вопросов — вопрос обеспечения кадрами.
Завершается обзор целостными кейсами — лучшими практиками R&D на примере шести крупных компаний из разных отраслей.
Настоящее издание рассчитано на широкий круг казахстанских и зарубежных читателей — лидеров крупного и среднего бизнеса,
представителей государственных органов, институтов развития и других организаций, вовлеченных в процесс развития инновационной
деятельности вокруг крупных корпоративных R&D центров
2017-03-29T03:52:47Z
2017-03-29T03:52:47Z
2016
Book
Корпоративные R&D центры: платформа для устойчивого роста бизнеса / А.Б. Жакупов, Б. Н. Султангазин, А.К. Утегулов, Г. Е. Тулегенова, А. А. Алтынбеков. – Aстана: ЧУ «Nazarbayev University Research and Innovation System», 2016 – 84 c., http://nur.nu.edu.kz/handle/123456789/2366
http://nur.nu.edu.kz/handle/123456789/2366
ru
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
ЧУ «Nazarbayev University Research and Innovation System»
oai:nur.nu.edu.kz:123456789/24602018-08-15T03:49:50Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T08:36:36Z
urn:hdl:123456789/2460
ASTANA SOLAR LLP. Manufacture of photovoltaic panels in the Republic of Kazakhstan
Kikbayev, Alexander
solar power station
solar power
solar
2017-08-03T08:36:36Z
2017-08-03T08:36:36Z
2017-07
Presentation
Kikbayev, Alexander (2017) ASTANA SOLAR LLP. Untertitelformat bearbeiten Manufacture of photovoltaic panels in the Republic of Kazakhstan. International Seminar “Towards Smart Sustainable Cities – Integrated Approaches” on 15-16 June 2017.
http://nur.nu.edu.kz/handle/123456789/2460
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction"
oai:nur.nu.edu.kz:123456789/24612018-08-15T03:50:27Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T08:44:53Z
urn:hdl:123456789/2461
FUTURE POWER SYSTEMS: CHALLENGES AND SOLUTIONS
Ni, Alexander
future power systems
power
2017-08-03T08:44:53Z
2017-08-03T08:44:53Z
2017-07
Presentation
Ni, Alexander (2017) FUTURE POWER SYSTEMS: CHALLENGES AND SOLUTIONS.
http://nur.nu.edu.kz/handle/123456789/2461
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction".12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24622018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T08:49:25Z
urn:hdl:123456789/2462
KAZAKHSTAN LEGISLATION IN GREEN ENERGY ENHANCEMENT
Stamkulov, Alzhan
green energy enhancement
green energy
2017-08-03T08:49:25Z
2017-08-03T08:49:25Z
2017-07
Presentation
Stamkulov, Alzhan (2017) KAZAKHSTAN LEGISLATION IN GREEN ENERGY ENHANCEMENT. International Seminar “Towards Smart Sustainable Cities – Integrated Approaches” on 15-16 June 2017
http://nur.nu.edu.kz/handle/123456789/2462
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction".12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24652018-08-15T03:50:27Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T09:12:30Z
urn:hdl:123456789/2465
The most important aspects of personnel training for the "green" future of the Planet
Anufriev, Valeriy
green economy
green future
2017-08-03T09:12:30Z
2017-08-03T09:12:30Z
2017-07-12
Presentation
http://nur.nu.edu.kz/handle/123456789/2465
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24682018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:01:40Z
urn:hdl:123456789/2468
THE MISSING LINK TO GREEN ENERGY – ENERGY STORAGE
Nurpeissova, Arailym
green energy
energy storage
2017-08-03T10:01:40Z
2017-08-03T10:01:40Z
2017-07-12
Presentation
Nurpeissova, Arailym (2017) THE MISSING LINK TO GREEN ENERGY – ENERGY STORAGE.International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2468
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24692018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:08:36Z
urn:hdl:123456789/2469
Association of renewable energy of Kazakhstan
Kashkinbekov, Arman
renewable energy
2017-08-03T10:08:36Z
2017-08-03T10:08:36Z
2017-07-12
Article
Kashkinbekov, Arman (2017) Association of renewable energy of Kazakhstan.International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017.
http://nur.nu.edu.kz/handle/123456789/2469
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24702018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:11:55Z
urn:hdl:123456789/2470
A Personal View on a Zero Carbon Future
Winter, Axel
Zero Carbon
2017-08-03T10:11:55Z
2017-08-03T10:11:55Z
2017-07-12
Presentation
Winter, Axel (2017) A Personal View on a Zero Carbon Future. A Personal View on a Zero Carbon Future.
http://nur.nu.edu.kz/handle/123456789/2470
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24712018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:15:48Z
urn:hdl:123456789/2471
Deep decarbonisation and growth: challenges and prospects
Safonov, Georgy
decarbonisation scenarios
2017-08-03T10:15:48Z
2017-08-03T10:15:48Z
2017-07-12
Presentation
Safonov, Georgy (2017) Deep decarbonisation and growth: challenges and prospects. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2471
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
National Research University “Higher School of Economics” Moscow, Russia. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24722018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:22:01Z
urn:hdl:123456789/2472
ZERO CARBON FUTURE: CHALLENGE AND OPPORTUNITY FOR RESEARCH AND INDUSTRIAL APPLICATIONS
Vernazza, Gianni
Zero Carbon
Zero Carbon Future
2017-08-03T10:22:01Z
2017-08-03T10:22:01Z
2015-07-13
Presentation
Vernazza, Gianni (2017) ZERO CARBON FUTURE: CHALLENGE AND OPPORTUNITY FOR RESEARCH AND INDUSTRIAL APPLICATIONS. National Inter-University Consortium for Telecommunications. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction".
http://nur.nu.edu.kz/handle/123456789/2472
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
National Inter-University Consortium for Telecommunications. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction"
oai:nur.nu.edu.kz:123456789/24732020-07-14T04:29:57Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:30:52Z
urn:hdl:123456789/2473
The Political Economy of Green Energy
Lodhi, Iftikhar
green energy
2017-08-03T10:30:52Z
2017-08-03T10:30:52Z
2017-07-12
Presentation
Lodhi, Iftikhar (2017) The Political Economy of Green Energy. Nazarbayev University, Graduate School of Public Policy
http://nur.nu.edu.kz/handle/123456789/2473
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Nazarbayev University Graduate School of Public Policy
oai:nur.nu.edu.kz:123456789/24742018-08-15T03:50:09Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T10:39:37Z
urn:hdl:123456789/2474
Smart monitoring system for dry type transformer
Soltanbayev, Ilyas
dry type transformer
2017-08-03T10:39:37Z
2017-08-03T10:39:37Z
2017-07-12
Presentation
http://nur.nu.edu.kz/handle/123456789/2474
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Astana Electronic Laboratory
oai:nur.nu.edu.kz:123456789/24752018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T11:00:26Z
urn:hdl:123456789/2475
Russia’s stance in Paris accord implementation
Sinyugin, Oleg
renewable energy
Russia
2017-08-03T11:00:26Z
2017-08-03T11:00:26Z
2017-07
Presentation
Sinyugin, Oleg (2017) Russia’s stance in Paris accord implementation. M.V.Lomonosov Moscow State University, geography department, laboratory for renewable sources of energy. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2475
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
M.V.Lomonosov Moscow State University, geography department, laboratory for renewable sources of energy. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24762018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T11:06:37Z
urn:hdl:123456789/2476
Renewable Energy in Chile: “Where do we stand and where we are headed”
Pérez, Paulina
renewable energy
2017-08-03T11:06:37Z
2017-08-03T11:06:37Z
2017-07
Presentation
Pérez, Paulina (2017) Renewable Energy in Chile: “Where do we stand and where we are headed”. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2476
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24772018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T11:11:28Z
urn:hdl:123456789/2477
The German “Energiewende” — Making Energy Transitions Successful
Hefele, Peter
energy transitions
2017-08-03T11:11:28Z
2017-08-03T11:11:28Z
2017-07
Presentation
Hefele, Peter (2017) The German “Energiewende” — Making Energy Transitions SuccessfulKonrad-Adenauer-Stiftung. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction". 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2477
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Konrad-Adenauer-Stiftung. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction"
oai:nur.nu.edu.kz:123456789/24782018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-03T11:16:05Z
urn:hdl:123456789/2478
ENERGY, SCIENCE AND INNOVATION IN SWITZERLAND
Roesle, Phillippe
energy
science
innovation
SWITZERLAND
2017-08-03T11:16:05Z
2017-08-03T11:16:05Z
2017-07
Presentation
Roesle Phillippe (2017) ENERGY, SCIENCE AND INNOVATION IN SWITZERLAND. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2478
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24792018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T05:48:42Z
urn:hdl:123456789/2479
ELECTRIFYING AFRICA
Andrieu, Priscillia
Africa
climate change
2017-08-04T05:48:42Z
2017-08-04T05:48:42Z
2017-07
Presentation
Andrieu, Priscillia (2017) ELECTRIFYING AFRICA. Untertitelformat bearbeiten International efforts in fighting climate change: Part 2.International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017.
http://nur.nu.edu.kz/handle/123456789/2479
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24802018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T05:56:04Z
urn:hdl:123456789/2480
Towards a Low Carbon Energy Future
Pachauri, Rajendra
low carbon energy
2017-08-04T05:56:04Z
2017-08-04T05:56:04Z
2017-07-12
Presentation
Pachauri, Rajendra (2017) Towards a Low Carbon Energy Future. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2480
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24812018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:02:45Z
urn:hdl:123456789/2481
Energy Storage: a Critical Component of Future Energy
Rakymbay, Ruslan
energy storage
future energy
2017-08-04T06:02:45Z
2017-08-04T06:02:45Z
2017-07-13
Presentation
Rakymbay, Ruslan (2017) Energy Storage: a Critical Component of Future Energy.International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2481
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24822018-08-15T03:50:09Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:07:48Z
urn:hdl:123456789/2482
INNOVATION FOR THE GLOBE: JAPANESE LONG-TERM CLIMATE STRATEGY
Sugiyama, Taishi
Japanese
climate strategy
2017-08-04T06:07:48Z
2017-08-04T06:07:48Z
2017-07-13
Presentation
Sugiyama, Taishi (2017) INNOVATION FOR THE GLOBE: JAPANESE LONG-TERM CLIMATE STRATEGY.The Canon Institute of Global Studies (CIGS). International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12- 13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2482
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
The Canon Institute of Global Studies (CIGS). International Scientific and University Conference. "Climate Change and CO2 Emission Reduction"
oai:nur.nu.edu.kz:123456789/24832018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:17:22Z
urn:hdl:123456789/2483
THE CURRENT STATUS AND FUTURE PROSPECTS OF JAPAN’S ENERGY AND CLIMATE POLICY
Toichi, Tsutomu
Japanese
Japan
climate strategy
climate policy
2017-08-04T06:17:22Z
2017-08-04T06:17:22Z
2017-07-12
Presentation
Toichi, Tsutomu (2017) THE CURRENT STATUS AND FUTURE PROSPECTS OF JAPAN’S ENERGY AND CLIMATE POLICY. The Institute of Energy Economics, Japan.
http://nur.nu.edu.kz/handle/123456789/2483
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
The Institute of Energy Economics, Japan. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24842018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:23:13Z
urn:hdl:123456789/2484
EDUCATION FOR SUSTAINABLE DEVELOPMENT
Vukotic, Veselin
education
2017-08-04T06:23:13Z
2017-08-04T06:23:13Z
2017-07
Presentation
Vukotic, Veselin (2017) EDUCATION FOR SUSTAINABLE DEVELOPMENT. UNIVERSITY OF DONJA GORICA, MONTENEGRO. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2484
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
UNIVERSITY OF DONJA GORICA, MONTENEGRO. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017. Astana. Kazakhstan.
oai:nur.nu.edu.kz:123456789/24852018-08-15T03:50:27Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:27:18Z
urn:hdl:123456789/2485
KAZMUNAYGAS CONTRIBUTION TO THE LOW-CARBON DEVELOPMENT OF KAZAKHSTAN
Kuanbayeva, Yelena
low carbon energy
low carbon
2017-08-04T06:27:18Z
2017-08-04T06:27:18Z
2017
Presentation
Kuanbayeva, Yelena (2017) KAZMUNAYGAS CONTRIBUTION TO THE LOW-CARBON DEVELOPMENT OF KAZAKHSTAN. KazMunayGas. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
http://nur.nu.edu.kz/handle/123456789/2485
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
KazMunayGas. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24862018-08-15T03:49:47Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:30:51Z
urn:hdl:123456789/2486
ALIGNING CLIMATE CHANGE ACTION AND SUSTAINABLE DEVELOPMENT GOALS
Sokona, Youba
climate change
2017-08-04T06:30:51Z
2017-08-04T06:30:51Z
2017
Presentation
Sokona_, Youba (2017) ALIGNING CLIMATE CHANGE ACTION AND SUSTAINABLE DEVELOPMENT GOALS. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017.
http://nur.nu.edu.kz/handle/123456789/2486
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24872018-08-15T03:50:09Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:36:46Z
urn:hdl:123456789/2487
TRANSITION TO A GREEN ECONOMY IN KAZAKHSTAN
Kapsalyamova, Zhanna
green economy
solid waste management
2017-08-04T06:36:46Z
2017-08-04T06:36:46Z
2017
Presentation
Kapsalyamova, Zhanna (2017) TRANSITION TO A GREEN ECONOMY IN KAZAKHSTAN. International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017.
http://nur.nu.edu.kz/handle/123456789/2487
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International Scientific and University Conference. "Climate Change and CO2 Emission Reduction" 12-13 July, 2017
oai:nur.nu.edu.kz:123456789/24882018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2467
2017-08-04T06:43:26Z
urn:hdl:123456789/2488
ЭНЕРГОЭФФЕКТИВНОСТЬ В КАЗАХСТАНЕ КАК МЕРА ПЕРЕХОДА К ЗЕЛЕНОЙ ЭНЕРГЕТИКЕ
Кабыкенов, Алмат
зеленая энергетика
энергоэффективность
2017-08-04T06:43:26Z
2017-08-04T06:43:26Z
2017-07
Presentation
Кабыкенов, Алмат (2017) АО «ИНСТИТУТ РАЗВИТИЯ ЭЛЕКТРОЭНЕРГЕТИКИ И ЭНЕРГОСБЕРЕЖЕНИЯ (КАЗАХЭНЕРГОЭКСПЕРТИЗА)».
http://nur.nu.edu.kz/handle/123456789/2488
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
АО «ИНСТИТУТ РАЗВИТИЯ ЭЛЕКТРОЭНЕРГЕТИКИ И ЭНЕРГОСБЕРЕЖЕНИЯ (КАЗАХЭНЕРГОЭКСПЕРТИЗА)»
oai:nur.nu.edu.kz:123456789/25422018-08-15T03:50:11Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T09:56:10Z
urn:hdl:123456789/2542
Witnessing the reionization history using Cosmic Microwave Background observation from Planck
Hazra, Dhiraj Kumar
Smoot, George F.
reionization
cosmic microwave
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
We constrain the history of reionization using the data from Planck 2015 Cosmic Microwave Background (CMB) temperature and polarization anisotropy observations. We also use prior constraints on the reionization history at redshifts ~7-8 obtained from Lyman- emission observations. Using the free electron fractions at different redshifts as free parameters, we construct the complete reionization history using polynomials. Our construction provides an extremely exible framework to search for the history of reionization as a function of redshifts. We present a conservative and an optimistic constraint on reionization that are categorized by the exibilities of the models and datasets used to constrain them, and we report that CMB data marginally favors extended reionization histories. In both the cases, we nd the mean values of optical depth to be larger ( 0:09 and 0:1) than what we nd in standard step like reionization histories (0:079 0:017). At the same time we also nd that the maximum free electron fraction allowed by the data for redshifts more than 15 is 0:25 at 95.4% con dence limit in the case of optimistic constraint.
2017-08-24T09:56:10Z
2017-08-24T09:56:10Z
2017-08-16
Article
Hazra, Dhiraj Kumar. Smoot, George F. (2017) Witnessing the reionization history using Cosmic Microwave Background observation from Planck. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://nur.nu.edu.kz/handle/123456789/2542
https://arxiv.org/abs/1708.04913
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25432018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:02:59Z
urn:hdl:123456789/2543
Slicing the Vacuum: New Accelerating Mirror Solutions of the Dynamical Casimir Effect
Good, Michael R.R.
Linder, Eric V.
mirror solutions
dynamical casimir effect
radiation
energy
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
Radiation from accelerating mirrors in a Minkowski spacetime provides insights into the nature of horizons, black holes, and entanglement entropy. We introduce new, simple, symmetric and analytic moving mirror solutions and study their particle, energy, and entropy production. This includes an asymptotically static case with nite emission that is the black hole analog of complete evaporation. The total energy, total entropy, total particles, and spectrum are the same on both sides of the mirror. We also study its asymptotically inertial, drifting analog (which gives a black hole remnant) to explore di erences in nite and in nite production.
2017-08-24T10:02:59Z
2017-08-24T10:02:59Z
2017-07-17
Article
Good, Michael R.R. Linder, Eric V. (2017) Slicing the Vacuum: New Accelerating Mirror Solutions of the Dynamical Casimir Effect. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://nur.nu.edu.kz/handle/123456789/2543
https://arxiv.org/abs/1707.03670
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25442018-08-15T03:50:27Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:10:14Z
urn:hdl:123456789/2544
Accelerated Parameter Estimation with DALEX
Daniel, Scott F.
Linder, Eric V.
Markov chain Monte Carlo
DALEX
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
We consider methods for improving the estimation of constraints on a high-dimensional parameter space with a computationally expensive likelihood function. In such cases, Markov chain Monte Carlo (MCMC) can take a long time to converge and concentrates on finding the maxima rather than the often-desired confidence contours
for accurate error estimation. We employ DALEχ (Direct Analysis of Limits via the Exterior of χ2) for determining confidence contours by minimizing a cost function parametrized to incentivize points in parameter space which are both on the confidence limit and far from previously sampled points. We compare DALEχ to the nested sampling algorithm implemented in MultiNest on a toy likelihood function that is highly non-Gaussian and non-linear in the mapping between parameter values and χ2. We find that in high-dimensional cases DALEχ finds the same confidence limit as Multi-Nest using roughly an order of magnitude fewer evaluations of the likelihood function. DALEχ is open-source and available at https://github.com/danielsf/Dalex.git .
2017-08-24T10:10:14Z
2017-08-24T10:10:14Z
2017-05-02
Article
Daniel, Scott F. Linder, Eric V. (2017) Accelerated Parameter Estimation with DALEX. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://nur.nu.edu.kz/handle/123456789/2544
http://arxiv.org/abs/1705.02007v1
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25452018-08-15T03:50:27Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:16:23Z
urn:hdl:123456789/2545
Constraining Dark Energy Dynamics in Extended Parameter Space
Valentino, Eleonora Di
Melchiorri, Alessandro
Linder, Eric V.
Silk, Joseph
dark energy
parameter space
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
Dynamical dark energy has been recently suggested as a promising and physical way to solve the 3 sigma tension on the value of the Hubble constant H0 between the direct measurement of Riess et al. (2016) (R16, hereafter) and the indirect constraint from Cosmic Microwave Anisotropies obtained by the Planck satellite under the assumption of a CDM model. In this paper, by parameterizing dark energy evolution using the w0-wa approach, and considering a 12 parameter extended scenario, we find that: a) the tension on the Hubble constant can indeed be solved with dynamical dark energy, b) a cosmological constant is ruled out at more than 95% c.l. by the Planck+R16 dataset, and c) all of the standard quintessence and half of the "downward going" dark energy model space (characterized by an equation of state that decreases with time) is also excluded at more than 95% c.l. These results are further confirmed when cosmic shear, CMB lensing, or SN Ia luminosity distance data are also included. However, tension remains with the BAO dataset. A cosmological constant and small portion of the freezing quintessence models are still in agreement with the Planck+R16+BAO dataset at between 68% and 95% c.l. Conversely, for Planck plus a phenomenological H0 prior, both thawing and freezing quintessence models prefer a Hubble constant of less than 70 km/s/Mpc. The general conclusions hold also when considering models with non-zero spatial curvature.
2017-08-24T10:16:23Z
2017-08-24T10:16:23Z
2017-04-03
Article
Valentino, Eleonora Di et al. (2017) Constraining Dark Energy Dynamics in Extended Parameter Space. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://nur.nu.edu.kz/handle/123456789/2545
https://arxiv.org/abs/1704.00762
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25462018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:30:59Z
urn:hdl:123456789/2546
Cosmic Growth Signatures of Modified Gravitational Strength
Denissenya, Mikhail
Linder, Eric V.
cosmic structure
gravity
gravitational strength
cosmic growth signature
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
Cosmic growth of large scale structure probes the entire history of cosmic expansion and gravitational coupling. To get a clear picture of the effects of modification of gravity we consider a deviation in the coupling strength (effective Newton’s constant) at different redshifts, with different durations and amplitudes. We derive, analytically and numerically, the impact on the growth rate and growth amplitude. Galaxy redshift surveys can measure a product of these through redshift space distortions and we connect the modified gravity to the observable in a way that may provide a useful parametrization of the ability of future surveys to test gravity. In particular, modifications during the matter dominated era can be treated by a single parameter, the “area” of the modification, to an accuracy of 0.3% in the observables. We project constraints on both early and late time gravity for the Dark Energy Spectroscopic Instrument and discuss what is needed for tightening tests of gravity to better than 5% uncertainty.
2017-08-24T10:30:59Z
2017-08-24T10:30:59Z
2017-03-02
Article
Denissenya, Mikhail. Linder, Eric V. (2017) Cosmic Growth Signatures of Modified Gravitational Strength. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://arxiv.org/abs/1703.00917v1
http://nur.nu.edu.kz/handle/123456789/2546
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25472018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:38:44Z
urn:hdl:123456789/2547
Λ is Coming: Parametrizing Freezing Fields
Linder, Eric V.
freezing fields
dark energy
cosmology
Hubble parameter
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
We explore freezing dark energy, where the evolution of the field approaches that of a cosmological constant at late times. We propose two general, two parameter forms to describe the class of freezing field models, in analogy to ones for thawing fields, here based on the physics of the flow parameter or the calibrated w–w′ phase space. Observables such as distances and Hubble parameters are fit to within 0.1%, and the dark energy equation of state generally to within better than 1%, of the exact numerical solutions.
2017-08-24T10:38:44Z
2017-08-24T10:38:44Z
2017-03-21
Article
Linder, Eric V. (2017) Λ is Coming: Parametrizing Freezing Fields. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://arxiv.org/abs/1701.01445v2
http://nur.nu.edu.kz/handle/123456789/2547
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25482018-08-15T03:50:11Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:46:13Z
urn:hdl:123456789/2548
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: constraining modi ed gravity
Mueller, Eva-Maria
Percival, Will
Linder, Eric
Alam, Shadab
Zhao, Gong-Bo
Sanchez, Ariel G.
Beutler, Florian
gravitation
cosmology
large scale structure of the universe
dark energy
cosmological parameters
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
We use baryon acoustic oscillation and redshift space distortion from the completed Baryon Oscillation Spectroscopic Survey, corresponding to data release 12 of the Sloan Digital Sky Survey, combined sample analysis in combination with cosmic microwave background, supernova and redshift space distortion measurements from additional spectroscopic surveys to test deviations from general relativity. We present constraints on several phenomenological models of modi ed gravity: First, we parametrise the growth of structure using the growth index, nding = 0:566 0:058 (68% C.L.). Second, we modify the relation of the two Newtonian potentials by introducing two additional parameters, GM and GL. In this approach, GM refers to modi cations of the growth of structure whereas GL to modi cation of the lensing potential. We consider a power law to model the redshift dependency of GM and GL as well as binning in redshift space, introducing four additional degrees of freedom, GM(z < 0:5), GM(z > 0:5), GL(z < 0:5), GL(z > 0:5). At 68% C.L. we measure GM = 0:980 0:096 and GL = 1:082 0:060 for a linear model, GM = 1:01 0:36 and GL = 1:31 0:19 for a cubic model as well as GM(z < 0:5) = 1:26 0:32, GM(z > 0:5) = 0:986 0:022, GL(z < 0:5) = 1:067 0:058 and GL(z > 0:5) = 1:037 0:029. Thirdly, we investigate general scalar tensor theories of gravity, nding the model to be mostly unconstrained by current data. Assuming a one-parameter f(R) model we can constrain B0 < 7:7 105 (95% C.L). For all models we considered we nd good agreement with general relativity.
2017-08-24T10:46:13Z
2017-08-24T10:46:13Z
2016-12-02
Article
Mueller, Eva-Maria et al. (2016) The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: constraining modi ed gravity. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
https://arxiv.org/abs/1612.00812
http://nur.nu.edu.kz/handle/123456789/2548
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/25492018-08-15T03:50:10Zcom_123456789_2466com_123456789_127col_123456789_2541
2017-08-24T10:51:13Z
urn:hdl:123456789/2549
Cosmic Growth and Expansion Conjoined
Linder, Eric V.
cosmology
dark energy
cosmic growth
gravity
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
Cosmological measurements of both the expansion history and growth history have matured, and the two together provide an important test of general relativity. We consider their joint evolutionary track, showing that this has advantages in distinguishing cosmologies relative to considering them individually or at isolated redshifts. In particular, the joint comparison relaxes the shape degeneracy that makes f 8(z) curves difficult to separate from the overall growth amplitude. The conjoined method further helps visualization of which combinations of redshift ranges provide the clearest discrimination. We examine standard dark energy cosmologies, modified gravity, and “stuttering” growth, each showing distinct signatures.
2017-08-24T10:51:13Z
2017-08-24T10:51:13Z
2016-10-17
Article
Linder, Eric V. (2016) Cosmic Growth and Expansion Conjoined. International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
http://arxiv.org/abs/1610.05321v1
http://nur.nu.edu.kz/handle/123456789/2549
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
International conference "ECL17: Exploring the Energetic Universe 2017", Nazarbayev University Energetic Cosmic Laboratory
oai:nur.nu.edu.kz:123456789/27742018-08-15T03:50:14Zcom_123456789_127col_123456789_2365
2017-11-09T08:39:19Z
urn:hdl:123456789/2774
Optical Emission of the Nuclear-Induced Plasmas of Gas Mixtures
Khasenov, Mendykhan U.
nuclear pumping
heteronuclear ionic molecules
ionizing radiation
The characteristic properties of the inverted-population-forming processes in lasers with ionizing pumping are considered. Results obtained fromresearch of active lasermedia concerning the p-s transitions of atoms of neon, mercury, and cadmium are presented.
The feasibility of ion-ion recombination in lasers with nuclear pumping is discussed. The excitation kinetics of the first negative system of CO, heteronuclear ionic molecules of inert gases, and halogenides of inert gases under ionizing radiation are considered.
2017-11-09T08:39:19Z
2017-11-09T08:39:19Z
2014-04-24
Article
Khasenov Mendykhan U., 2014(April 24), Optical Emission of the Nuclear-Induced Plasmas of Gas Mixtures, International Journal of Optics, Volume 2014, 16 pages
http://dx.doi.org/10.1155/2014/748763
http://nur.nu.edu.kz/handle/123456789/2774
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Open Access - the content is available to the general public
Attribution-NonCommercial-ShareAlike 3.0 United States
International Journal of Optics
oai:nur.nu.edu.kz:123456789/28832021-02-05T05:56:43Zcom_123456789_127col_123456789_2365
2017-12-14T04:20:45Z
urn:hdl:123456789/2883
Using Von Mises-fisher Distribution for Polymer Conformation Analysis in Multi-scale Framework
Abzhanov, Aidos
Kallemov, Bakytzhan
von Mises-Fisher
multi-scale model
polymer conformation
GPGPU
Abstract In this study we consider the statistical representation of polymer conformations, which is very important when modeling rheology at macroscopic scales. It is impossible to track all relevant microscopic variables for each polymer in a polymer-laden solution due to the huge number degrees of freedom associated with such fluids. We applied this approach to one of the most descriptive kinetic models of polymer, Kramers bead-rod model, where the probability density function models the angle of each rod with respect to the fixed coordinate axes. Towards this goal we apply mixture of von Mises-Fisher distribution for modeling a polymer conformation. The Expectation-Maximization based clustering algorithms are used to estimate the conformation given the ensemble of polymers. Both distribution sampling and parameters estimation have been implemented in parallel using CPU and GPU based platforms.
2017-12-14T04:20:45Z
2017-12-14T04:20:45Z
2013-01-01
Article
Aidos Abzhanov, Bakytzhan Kallemov, Using Von Mises-fisher Distribution for Polymer Conformation Analysis in Multi-scale Framework, In Procedia Engineering, Volume 61, 2013, Pages 111-116
18777058
https://www.sciencedirect.com/science/article/pii/S1877705813011685
http://nur.nu.edu.kz/handle/123456789/2883
Procedia Engineering
Copyright © 2013 The Authors. Published by Elsevier Ltd.
oai:nur.nu.edu.kz:123456789/29162021-02-05T05:56:48Zcom_123456789_127col_123456789_2365
2017-12-15T03:44:49Z
urn:hdl:123456789/2916
A new step in the development of Zn/LiFePO4 aqueous battery
Molkenova, A.
Belgibayeva, A.
Ibrayeva, D.
Sultanov, M.
Zhumagali, S.
Akhmetova, N.
Hara, T.
Bakenov, Z.
3D structured electrode
aqueous rechargeable lithium-ion battery
electrodeposition
electropolymerization
polymer coating
Abstract In recent years, aqueous batteries have gained much attention due to their low production cost and exceptional safety compared to commercial Li-ion battery systems. Three-dimensional (3D) structure could be promising to enhance these batteries energy capacity. In this work, the electrochemical performance of 3D Zn electrode, developed for aqueous rechargeable Zn/LiFePO4 (Zn/LFP) battery system, was studied. Formation of uniformly coated Zn metal on the three-dimensionally organized carbon fibers was verified by field emission scanning electron microscopy (FE-SEM). The electrochemical performance of the battery with this anode was tested for over 50 cycles, where the initial capacity decayed by 11%. Further, poly(methyl methacrylate) (PMMA) and poly(p-phenylene oxide) (PPO) polymer coatings were extensively investigated as a potential separator for the 3D aqueous battery system. Cyclability of PMMA-coated Zn anode was better than that of “plane” Zn; however, the initial capacity of 3D Zn anode was lower than that for the counterpart system.
2017-12-15T03:44:49Z
2017-12-15T03:44:49Z
2017-01-01
Article
A. Molkenova, A. Belgibayeva, D. Ibrayeva, M. Sultanov, S. Zhumagali, N. Akhmetova, T. Hara, Z. Bakenov, A new step in the development of Zn/LiFePO4 aqueous battery, In Materials Today: Proceedings, Volume 4, Issue 3, Part A, 2017, Pages 4452-4457
22147853
https://www.sciencedirect.com/science/article/pii/S2214785317305643
http://nur.nu.edu.kz/handle/123456789/2916
Materials Today: Proceedings
© 2017 Elsevier Ltd. All rights reserved.
oai:nur.nu.edu.kz:123456789/29172021-02-05T05:59:51Zcom_123456789_127col_123456789_2365
2017-12-15T03:47:51Z
urn:hdl:123456789/2917
Electrodeposited Ni-Sn intermetallic alloy electrode for 3D sulfur battery
Tolegen, B.
Adi, A.
Aishova, A.
Bakenov, Z.
Nurpeissova, A.
3D structured electrode
3D nickel foam
tin-nickel alloy
electrodeposition
Abstract 3D architecture appeared to be a promising design to enhance the performance of the Lithium-ion batteries by shortening the lithium ion diffusion path and increasing the energy density per unit area. In this paper, we report preliminary results of facile electrodeposition of intermetallic tin-nickel alloy from electrolyte solution onto 3D structured nickel foam for 3D lithium-sulfur battery. The coated films were characterized for their morphologies, structural and electrochemical properties. Scanning electron microscope images revealedthin and homogenous film while XRD revealed the expected phase of intermetallic alloy Ni3Sn4. The electrochemical activity of the film showed to be a promising start to be used as an anode material and needs further works to be optimized.
2017-12-15T03:47:51Z
2017-12-15T03:47:51Z
2017-01-01
Article
B. Tolegen, A. Adi, A. Aishova, Z. Bakenov, A. Nurpeissova, Electrodeposited Ni-Sn intermetallic alloy electrode for 3D sulfur battery, In Materials Today: Proceedings, Volume 4, Issue 3, Part A, 2017, Pages 4491-4495
22147853
https://www.sciencedirect.com/science/article/pii/S2214785317305734
http://nur.nu.edu.kz/handle/123456789/2917
Materials Today: Proceedings
© 2017 Elsevier Ltd. All rights reserved.
oai:nur.nu.edu.kz:123456789/29672021-02-05T05:59:53Zcom_123456789_127col_123456789_2365
2017-12-20T09:06:49Z
urn:hdl:123456789/2967
Thiol-modified activated carbon material for sensor technology
Zhexembekova, Anar
Akhmetova, Nuriya
Molkenova, Anara
Bakenov, Zhumabay
O'Hare, Danny
Thiol-modified carbon
Sensors
Absorbance
Working electrode
Sensing electrode
Microporous membrane
Surface area
Abstract Activated carbon (AC) is a material of great potential in production of membranes for a construction of novel electrochemical sensors due to highly microporous structure and greater surface area per unit volume [1]. Herein we report the production of thiol-modified activated-carbon-based composite. It was obtained by treatment of ketjen black (KB) with concentrated nitric acid (69 wt.%) and further mixing with sulfur (5 wt.%) through high-energy ball milling process. The obtained composite underwent two-stage heat treatment in a tubular furnace under an atmosphere of Ar followed by 4% H2 in N2. All samples were characterized using thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR). The presence of thiol functional was validated by absorbance peaks at around 665 cm-1 and 2360 cm-1. As revealed by TGA, sulfur doped activated KB (KB/S) underwent significant mass loss (70.5%) compared with KB (0.8%), which corresponds to an increase in the effective surface area.
2017-12-20T09:06:49Z
2017-12-20T09:06:49Z
2017-01-01
Article
22147853
https://www.sciencedirect.com/science/article/pii/S221478531730603X
http://nur.nu.edu.kz/handle/123456789/2967
Materials Today: Proceedings
© 2017 Elsevier Ltd. All rights reserved.
oai:nur.nu.edu.kz:123456789/29682021-02-05T05:59:54Zcom_123456789_127col_123456789_2365
2017-12-20T09:06:51Z
urn:hdl:123456789/2968
Thiol-modified activated carbon material for sensor technology
Zhexembekova, Anar
Akhmetova, Nuriya
Molkenova, Anara
Bakenov, Zhumabay
O'Hare, Danny
Thiol-modified carbon
Sensors
Absorbance
Working electrode
Sensing electrode
Microporous membrane
Surface area
Abstract Activated carbon (AC) is a material of great potential in production of membranes for a construction of novel electrochemical sensors due to highly microporous structure and greater surface area per unit volume [1]. Herein we report the production of thiol-modified activated-carbon-based composite. It was obtained by treatment of ketjen black (KB) with concentrated nitric acid (69 wt.%) and further mixing with sulfur (5 wt.%) through high-energy ball milling process. The obtained composite underwent two-stage heat treatment in a tubular furnace under an atmosphere of Ar followed by 4% H2 in N2. All samples were characterized using thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR). The presence of thiol functional was validated by absorbance peaks at around 665 cm-1 and 2360 cm-1. As revealed by TGA, sulfur doped activated KB (KB/S) underwent significant mass loss (70.5%) compared with KB (0.8%), which corresponds to an increase in the effective surface area.
2017-12-20T09:06:51Z
2017-12-20T09:06:51Z
2017-01-01
Article
Anar Zhexembekova, Nuriya Akhmetova, Anara Molkenova, Zhumabay Bakenov, Danny O'Hare, Thiol-modified activated carbon material for sensor technology, In Materials Today: Proceedings, Volume 4, Issue 3, Part A, 2017, Pages 4599-4602
22147853
https://www.sciencedirect.com/science/article/pii/S221478531730603X
http://nur.nu.edu.kz/handle/123456789/2968
Materials Today: Proceedings
© 2017 Elsevier Ltd. All rights reserved.
oai:nur.nu.edu.kz:123456789/30092018-08-15T03:50:23Zcom_123456789_127col_123456789_2365
2017-12-22T02:53:36Z
urn:hdl:123456789/3009
Cooperation benefits of Caspian countries in their energy sector development
De Miglio, Rocco
Akhmetbekov, Yerbol
Baigarin, Kanat
Bakdolotov, Aidyn
Tosato, GianCarlo
Caspian oil and gas
Export-oriented scenarios
Cross-country infrastructures
Energy systems analysis
Technical economic growth models
Energy balances and statistics
Abstract This paper studies the development possibilities of the energy systems of four Central Asia and Caspian countries. It explores options that improve their domestic energy efficiencies and increase their export of fossil energy commodities. Using the MARKAL-TIMES modelling tool, it represents their energy system with a bottom-up partial economic equilibrium growth model. With the help of scenario analyses, it evaluates the direct economic advantage of improving the domestic energy efficiencies. Furthermore it calculates the direct economic advantage of cooperation. It finds out that a new/different geo-economic attitude brings USD billions of annual economic benefits, particularly if the countries aim to differentiate their export routes, increase the amount of export and contribute to climate change mitigation.
2017-12-22T02:53:36Z
2017-12-22T02:53:36Z
2014-08-01
Analysis
Rocco De Miglio, Yerbol Akhmetbekov, Kanat Baigarin, Aidyn Bakdolotov, GianCarlo Tosato, Cooperation benefits of Caspian countries in their energy sector development, In Energy Strategy Reviews, Volume 4, 2014, Pages 52-60
2211467X
https://www.sciencedirect.com/science/article/pii/S2211467X14000406
http://nur.nu.edu.kz/handle/123456789/3009
Energy Strategy Reviews
Copyright © 2014 The Authors. Published by Elsevier Ltd.
oai:nur.nu.edu.kz:123456789/30162021-02-05T05:59:55Zcom_123456789_127col_123456789_2365
2017-12-22T03:23:50Z
urn:hdl:123456789/3016
Using pyridal[2,1,3]thiadiazole as an acceptor unit in a low band-gap copolymer for photovoltaic applications
Ibraikulov, Olzhas A.
Bechara, Rony
Chavez, Patricia
Bulut, Ibrahim
Tastanbekov, Dias
Leclerc, Nicolas
Hebraud, Anne
Heinrich, Benoît
Berson, Solenn
Lemaitre, Noëlla
Chochos, Christos L.
Lévêque, Patrick
Heiser, Thomas
Polymer solar cells
Energy disorder
Charge transport
Field-effect mobility
Space-charge-limited current
Morphology
Abstract In this report, we explore the optoelectronic properties of a low band-gap copolymer based on the alternation of electron rich (thiophene and thienothiophene units) and electron deficient units (pyridal[2,1,3]thiadiazole (Py)). Initial density functional theory calculations point out the interest of using the Py unit to optimize the polymer frontier orbital energy levels. A high molecular weight (Mn=49kg/mol) solution-processable copolymer, based on Py, thiophene and thienothiophene units, has been synthesized successfully. From cyclic-voltammetry and UV–visible absorption measurements a relatively deep HOMO level (−5.1eV) and an optical band-gap (1.48eV) have been estimated. Charge transport both in horizontal and vertical directions were extracted from field-effect transistors and space charge limited current diodes, respectively, and led to a relatively high in-plane hole mobility in pure polymer films (0.7×10−2cm2V−1s−1). GIWAXS results showed almost identical in-plane lamellar morphologies, with similar average size and orientation of the polymer crystalline domains in both, pure polymer films and polymer:fullerene blends. Also, the gate-voltage dependence of the field-effect mobility revealed that the energy disorder in the polymer domains was not altered by the introduction of fullerenes. The nevertheless significantly higher out-of-plane hole mobility in blends, in comparison to pure polymer films, was attributed to the minor amorphous polymer phase, presumably localized close to the donor/acceptor interface, whose signature was observed by UV–vis absorption. Promising photovoltaic performances could be achieved in a standard device configuration. The corresponding power conversion efficiency of 4.5% is above the value achieved previously with a comparable polymer using benzo [2,1,3]thiadiazole instead of Py as acceptor unit.
2017-12-22T03:23:50Z
2017-12-22T03:23:50Z
2015-08-01
Article
Olzhas A. Ibraikulov, Rony Bechara, Patricia Chavez, Ibrahim Bulut, Dias Tastanbekov, Nicolas Leclerc, Anne Hebraud, Benoît Heinrich, Solenn Berson, Noëlla Lemaitre, Christos L. Chochos, Patrick Lévêque, Thomas Heiser, Using pyridal[2,1,3]thiadiazole as an acceptor unit in a low band-gap copolymer for photovoltaic applications, In Organic Electronics, Volume 23, 2015, Pages 171-178
15661199
https://www.sciencedirect.com/science/article/pii/S1566119915001858
http://nur.nu.edu.kz/handle/123456789/3016
Organic Electronics
Copyright © 2015 Elsevier B.V. All rights reserved.
oai:nur.nu.edu.kz:123456789/30612021-02-05T06:00:10Zcom_123456789_127col_123456789_2365
2017-12-22T09:19:46Z
urn:hdl:123456789/3061
MoS2 nanopowder as anode material for lithium-ion batteries produced by self-propagating high-temperature synthesis
Bozheyev, Farabi
Zhexembekova, Anar
Zhumagali, Shynggys
Molkenova, Anara
Bakenov, Zhumabay
Lithium-ion batteries
Molybdenum sulfide
Self-propagating high-temperature synthesis
Nanopowder
Abstract Due to continuous rise of demand for powerful energy sources for portable applications, high energy density and efficiency rechargeable batteries are under constant development. Currently, the most widely used power source for such applications is rechargeable lithium-ion batteries (LIBs). To increase the energy density, rate capability and cyclability of LIBs, alternative anode materials, such as MoS2, are under intensive investigation. The layered structure of MoS2 resembles graphite, and its theoretical specific capacity is about twice higher than that of graphite (670 mAh g-1 against 372 mAh g-1) due to its higher interlayer spacing (∼0.6 nm) for a Li-ion intercalation. In this work MoS2 nanopowder (MoS2-NP), prepared by self-propagating high-temperature synthesis (SHS), is used as an anode material (MoS2/C composition) for LIBs, and its electrochemical properties were analyzed. The MoS2-NP anode exhibited the initial charge capacity of 567 mAh g-1 at a current density of 50 mAh g-1. This performance will be improved by introduction of MoS2-NP into various carbon-containing composites.
2017-12-22T09:19:46Z
2017-12-22T09:19:46Z
2017-01-01
Article
Farabi Bozheyev, Anar Zhexembekova, Shynggys Zhumagali, Anara Molkenova, Zhumabay Bakenov, MoS2 nanopowder as anode material for lithium-ion batteries produced by self-propagating high-temperature synthesis, In Materials Today: Proceedings, Volume 4, Issue 3, Part A, 2017, Pages 4567-4571
22147853
https://www.sciencedirect.com/science/article/pii/S2214785317305953
http://nur.nu.edu.kz/handle/123456789/3061
Materials Today: Proceedings
© 2017 Published by Elsevier Ltd.
oai:nur.nu.edu.kz:123456789/30892021-02-05T05:59:57Zcom_123456789_127col_123456789_2365
2018-01-04T08:26:37Z
urn:hdl:123456789/3089
Computer simulation and visualization of supersonic jet for gas cluster equipment
Ieshkin, A.
Ermakov, Y.
Chernysh, V.
Ivanov, I.
Kryukov, I.
Alekseev, K.
Kargin, N.
Insepov, Z.
Cluster ions
Flow visualization
Supersonic nozzle
Abstract Supersonic nozzle is a key component of a gas cluster condensation system. We describe a flow visualization system using glow discharge with annular or plane electrodes. The geometric parameters of a supersonic jet under typical conditions used in a gas cluster ion beam accelerator are investigated. As well numerical simulations were performed. Dependence of inlet and ambient pressures and nozzle throat diameter on the shock bottle dimensions is described for different working gases. Influence of condensation rate on shock bottle axial size is discussed.
2018-01-04T08:26:37Z
2018-01-04T08:26:37Z
2015-09-21
Article
A. Ieshkin, Y. Ermakov, V. Chernysh, I. Ivanov, I. Kryukov, K. Alekseev, N. Kargin, Z. Insepov, Computer simulation and visualization of supersonic jet for gas cluster equipment, In Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 795, 2015, Pages 395-398
01689002
https://www.sciencedirect.com/science/article/pii/S0168900215007767
http://nur.nu.edu.kz/handle/123456789/3089
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Copyright © 2015 Elsevier B.V. All rights reserved.
oai:nur.nu.edu.kz:123456789/30902018-01-04T08:33:21Zcom_123456789_127col_123456789_2365oai:nur.nu.edu.kz:123456789/31022020-12-29T08:44:49Zcom_123456789_127col_123456789_2365
2018-01-04T10:06:49Z
urn:hdl:123456789/3102
Corrigendum to “Three-dimensional imaging of polymer materials by scanning probe tomography” [Eur. Polym. J. 52 (2014) 154–165]
Alekseev, Alexander
Efimov, Anton
Loos, Joachim
Matsko, Nadejda
Syurik, Julia
2018-01-04T10:06:49Z
2018-01-04T10:06:49Z
2014-06-01
Article
Alexander Alekseev, Anton Efimov, Joachim Loos, Nadejda Matsko, Julia Syurik, Corrigendum to “Three-dimensional imaging of polymer materials by scanning probe tomography” [Eur. Polym. J. 52 (2014) 154–165], In European Polymer Journal, Volume 55, 2014, Page 245
00143057
https://www.sciencedirect.com/science/article/pii/S0014305714000627
http://nur.nu.edu.kz/handle/123456789/3102
European Polymer Journal
Copyright © 2014 Elsevier Ltd. All rights reserved.
oai:nur.nu.edu.kz:123456789/31032020-12-29T08:41:46Zcom_123456789_127col_123456789_2365
2018-01-04T10:20:30Z
urn:hdl:123456789/3103
Three-dimensional imaging of polymer materials by Scanning Probe Tomography
Alekseev, Alexander
Efimov, Anton
Loos, Joachim
Matsko, Nadejda
Syurik, Julia
Scanning Probe Microscopy
Scanning Probe Tomography
Tomography
Three-dimensional reconstruction
Abstract Scanning Probe Tomography (SPT) is a new method for nanoscale volume imaging of sample morphology and property distribution based on Scanning Probe Microscopy (SPM). In this review we describe and discuss recent results obtained with different SPT techniques on polymer samples. The design of the existing SPM based instruments used for tomography in principle allows for volume reconstruction of any kind of mechanical, functional or chemical property distribution, which can be measured by SPM. We describe some recent volume reconstruction results from several types of polymer materials and critically discuss limitations and future prospects of SPM tomography.
2018-01-04T10:20:30Z
2018-01-04T10:20:30Z
2014-03-01
Abstract
Alexander Alekseev, Anton Efimov, Joachim Loos, Nadejda Matsko, Julia Syurik, Three-dimensional imaging of polymer materials by Scanning Probe Tomography, In European Polymer Journal, Volume 52, 2014, Pages 154-165
00143057
https://www.sciencedirect.com/science/article/pii/S0014305714000044
http://nur.nu.edu.kz/handle/123456789/3103
European Polymer Journal
Copyright © 2014 Elsevier Ltd. All rights reserved.
oai:nur.nu.edu.kz:123456789/35662018-10-31T18:45:23Zcom_123456789_127col_123456789_2365
2018-10-31T04:14:43Z
urn:hdl:123456789/3566
Start-up of Nazarbayev University Student Received Foreign Investment of $ 110,000
Kamiyeva, Magrifa
Yessekenova, Zhanetta
Miras Sovetov
ABC Business Incubation Program
ABC Quick Start Acceleration Program
start-up
We interviewed the alumni of the ABC Business Incubation Program and the ABC Quick Start Acceleration Program, a 3rd year student majoring in Electrical Engineering at Nazarbayev University, Miras Sovetov. It is a matter of great pride and joy for us, because his startup originates in the Incubation and Acceleration Program of Nazarbayev University, for which he has achieved extraordinary results to date. Miras as an independent participant joined us in February 2018, when he had only one idea, and now he has an amazing team. But how does Miras find his start-up idea? What you will have to go through for building a successful start-up? How to market your idea to potential foreign investors? All answers of these questions may be found in the interview.
2018-10-31T04:14:43Z
2018-10-31T04:14:43Z
2018-10
Other
Kamiyeva Magrifa, Yessekenova Zhanetta. 2018. Start-up of Nazarbayev University Student Received Foreign Investment of $ 110,000. Communications Department, Nazarbayev University Research and Innovation System
http://nur.nu.edu.kz/handle/123456789/3566
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Communications Department, Nazarbayev University Research and Innovation System
oai:nur.nu.edu.kz:123456789/37132019-02-04T06:00:30Zcom_123456789_127col_123456789_2365
2019-01-31T09:16:29Z
urn:hdl:123456789/3713
Nanometer size hole fabrication in 2d ultrathin films with cluster ion beams
Ainabayev, A.
Kirkpatrick, S.
Walsh, M.
Vyatkin, A. F.
Insepov, Z.
Gas cluster ion beams are proposed as a new tool for producing nanometer sized holes in
ultrathin 2D films. Surfaces of films of graphene, graphene oxide, MoS2, and HOPG, and also
silicon as a reference, were irradiated by Ar gas cluster ion beams (Exogenesis Corporation,
Billerica, MA USA). The results were analyzed using atomic force microscopy (AFM) and
Raman spectroscopy. Ar gas cluster ion acceleration energy was 30 keV and total ion fluences
ranged from 1108 to 11013 cm-2. Uniformly distributed holes, typically in the range of 10 to 25
nanometers in diameter, produced by the cluster ions, were observed on the surface of graphene
oxide. To the best of our knowledge, this is first experimental observation of such holes
2019-01-31T09:16:29Z
2019-01-31T09:16:29Z
2017-07-24
Article
Insepov, Z., Ainabayev, A., Kirkpatrick, S., Walsh, M., & Vyatkin, A. F. (2017). Nanometer size hole fabrication in 2d ultrathin films with cluster ion beams. AIP Advances, 7(7), [075014]. https://doi.org/10.1063/1.4996185
21583226
//dx.doi.org/10.1063/1.4996185
http://nur.nu.edu.kz/handle/123456789/3713
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
American Institute of Physics Inc.
oai:nur.nu.edu.kz:123456789/37142019-02-04T06:03:23Zcom_123456789_127col_123456789_2365
2019-01-31T09:45:48Z
urn:hdl:123456789/3714
SEM imaging of acoustically stimulated charge transport in solids
Emelin, E.
Cho, H. D.
Lee, J.
Kang, Tae Won
Panin, Gennady
Roshchupkin, Dmitry
Tynyshtykbayev, Kurbangali B.
Insepov, Z.
Applications of surface acoustic waves (SAWs) are of
great interest for solar energy for the acoustically stimulated
transport of charge carriers generated in semiconductors and
dielectrics under the influence of light.1–4 A prospective application of SAWs in solar cells could provide a 90% increase
in the cell efficiency. SAWs propagating in piezoelectric
crystals (piezoelectric semiconductor GaN and GaAs crystals
included) have opposite potential values in the SAW minima
and maxima due to the piezoelectric effect. Electrons and
holes generated by light in a semiconductor or in the subsurface layer of a piezoelectric crystal are correspondingly distributed between SAW minima and maxima. The charges are
then transported by SAWs to the solar cell exit at the acoustic
wave velocity. Taking advantage of the SAW presence in
solar cells, the area of charge “harvest” from the surface of a
semiconductor structure or a piezoelectric crystal can be
increased, and correspondingly, the solar cell efficiency can
be increased too.
2019-01-31T09:45:48Z
2019-01-31T09:45:48Z
2017-06-29
Article
Emelin, E., Cho, H. D., Insepov, Z., Lee, J. C., Kang, T. W., Panin, G., Tynyshtykbayev, K. (2017). SEM imaging of acoustically stimulated charge transport in solids. Applied Physics Letters, 110(26), [264103]. https://doi.org/10.1063/1.4986779
dx.doi.org/10.1063/1.4986779
http://nur.nu.edu.kz/handle/123456789/3714
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Applied Physics Letters
oai:nur.nu.edu.kz:123456789/37152019-02-04T04:04:01Zcom_123456789_127col_123456789_2365
2019-01-31T10:04:17Z
urn:hdl:123456789/3715
Low temperature synthesis of graphene nanocomposites using surface passivation of porous silicon nanocrystallites with carbon atoms
Tynyshtykbayev, Kurbangali B.
Ainabаyev, Ardak
Kononenko, O.
Chichkov
Insepov, Z.
Abstract This work presents the experimental investigation of the synthesis of graphene carbon nanocomposites (CNC-G) by carbonization of porous silicon (PS) using CVD method at low temperature of T = 350–500 °C. The low-temperature synthesis of CNC-G is explained by a low melting temperature of porous silicon nanocrystallites (nc-PS) formed during electrochemical etching.
2019-01-31T10:04:17Z
2019-01-31T10:04:17Z
2019-02-28
Article
09259635
https://www.sciencedirect.com/science/article/pii/S0925963518305569
http://nur.nu.edu.kz/handle/123456789/3715
en
Diamond and Related Materials
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
© 2018 Elsevier B.V. All rights reserved.
Attribution-NonCommercial-ShareAlike 3.0 United States
oai:nur.nu.edu.kz:123456789/37162019-02-01T04:21:18Zcom_123456789_127col_123456789_2365
2019-01-31T11:29:33Z
urn:hdl:123456789/3716
Computer simulation and visualization of supersonic jet for gas cluster equipment
Ermakov, Y.
Chernysh, V.
Ivanov, I.
Ieshkin, A.
Kryukov, I.
Alekseev, K.
Kargin, N.
Insepov, Z.
Abstract Supersonic nozzle is a key component of a gas cluster condensation system. We describe a flow visualization system using glow discharge with annular or plane electrodes. The geometric parameters of a supersonic jet under typical conditions used in a gas cluster ion beam accelerator are investigated. As well numerical simulations were performed. Dependence of inlet and ambient pressures and nozzle throat diameter on the shock bottle dimensions is described for different working gases. Influence of condensation rate on shock bottle axial size is discussed.
2019-01-31T11:29:33Z
2019-01-31T11:29:33Z
2015-09-21
Article
Ieshkin, A., Ermakov, Y., Chernysh, V., Ivanov, I., Kryukov, I., Alekseev, K., ... Insepov, Z. (2015). Computer simulation and visualization of supersonic jet for gas cluster equipment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 795, 395-398. [57827]. https://doi.org/10.1016/j.nima.2015.06.026
01689002
https://www.sciencedirect.com/science/article/pii/S0168900215007767
http://nur.nu.edu.kz/handle/123456789/3716
en
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Copyright © 2015 Elsevier B.V. All rights reserved.
Attribution-NonCommercial-ShareAlike 3.0 United States
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
oai:nur.nu.edu.kz:123456789/37172019-02-04T06:14:08Zcom_123456789_127col_123456789_2365
2019-02-01T05:05:39Z
urn:hdl:123456789/3717
A multiscale method for the analysis of defect behavior in Mo during electron irradiation
Rest, J.
Ye, B.
Yun, D.
Insepov, Z.
Abstract In order to overcome a lack of experimental information on values for key materials properties and kinetic coefficients, a multiscale modeling approach is applied to defect behavior in irradiated Mo where key materials properties, such as point defect (vacancy and interstitial) migration enthalpies as well as kinetic factors such as dimer formation, defect recombination, and self interstitial–interstitial loop interaction coefficients, are obtained by molecular dynamics calculations and implemented into rate-theory simulations of defect behavior. The multiscale methodology is validated against interstitial loop growth data obtained from electron irradiation of pure Mo. It is shown that the observed linear behavior of the loop diameter vs. the square root of irradiation time is a direct consequence of the 1D migration of self-interstitial atoms.
2019-02-01T05:05:39Z
2019-02-01T05:05:39Z
2014-10-31
Article
est, J., Insepov, Z., Ye, B., & Yun, D. (2014). A multiscale method for the analysis of defect behavior in Mo during electron irradiation. Computational Materials Science, 93, 169-177. https://doi.org/10.1016/j.commatsci.2014.06.044
09270256
https://www.sciencedirect.com/science/article/pii/S0927025614004558
http://nur.nu.edu.kz/handle/123456789/3717
en
Computational Materials Science
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Copyright © 2014 Elsevier B.V. Published by Elsevier B.V. All rights reserved.
Attribution-NonCommercial-ShareAlike 3.0 United States
Computational Materials Science
oai:nur.nu.edu.kz:123456789/37182019-02-04T06:13:25Zcom_123456789_127col_123456789_2365
2019-02-01T05:26:45Z
urn:hdl:123456789/3718
A ternary EAM interatomic potential for U-Mo alloys with xenon
Smirnova, D.E.
Kuksin, A. Y.
Starikov, S. V.
Stegailov, V. V.
Rest, J.
Yacout, A. M.
Insepov, Z.
A new interatomic potential for a uranium-molybdenum system with xenon is developed in the framework of an embedded atom model using a force-matching technique and a dataset of ab initio atomic forces. The verification of the potential proves that it is suitable for the investigation of various compounds existing in the system as well as for simulation of pure elements: U, Mo and Xe. Computed lattice constants, thermal expansion coefficients, elastic properties and melting temperatures of U, Mo and Xe are consistent with the experimentally measured values. The energies of the point defect formation in pure U and Mo are proved to be comparable to the density-functional theory calculations. We compare this new U-Mo-Xe potential with the previously developed U and Mo-Xe potentials. A comparative study between the different potential functions is provided. The key purpose of the new model is to study the atomistic processes of defect evolution taking place in the U-Mo nuclear fuel. Here we use the potential to simulate bcc alloys containing 10 wt% of intermetallic Mo and U2Mo.
2019-02-01T05:26:45Z
2019-02-01T05:26:45Z
2013-04
Article
Smirnova, D. E., Kuksin, A. Y., Starikov, S. V., Stegailov, V. V., Insepov, Z., Rest, J., & Yacout, A. M. (2013). A ternary EAM interatomic potential for U-Mo alloys with xenon. Modelling and Simulation in Materials Science and Engineering, 21(3), [035011]. https://doi.org/10.1088/0965-0393/21/3/035011
dx.doi.org/10.1088/0965-0393/21/3/035011
http://nur.nu.edu.kz/handle/123456789/3718
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Modelling and Simulation in Materials Science and Engineering, 21(3)
oai:nur.nu.edu.kz:123456789/37192019-02-04T06:12:41Zcom_123456789_127col_123456789_2365
2019-02-01T05:42:16Z
urn:hdl:123456789/3719
In situ TEM investigation of Xe ion irradiation induced defects and bubbles in pure molybdenum single crystal
Yun, D.
Kirk, Marquis A.
Baldo, Peter M.
Rest, J.
Yacout, A. M.
Insepov, Z.
Abstract In order to study irradiation damage and inert gas bubble formation and growth behaviors, and to provide results and insights useful towards the validation of a multi-scale simulation approach based on a newly developed Xe–Mo inter-atomic potential, in situ Transmission Electron Microscopy (TEM) studies of Xe implantations in pure single crystal Molybdenum (Mo) have been conducted. 300keV and 400keV Xe+ ion beams were used to implant Xe in pre-thinned TEM Mo specimens. The irradiations were conducted at 300°C and 600°C to ion fluence up to 4×1016ions/cm2.In situ TEM characterization allows detailed behaviors of defect clusters to be observed and is very useful in illustrating defect interaction mechanisms and processes. Dislocation loops were found to form at relatively low irradiation fluence levels. The characterization results showed that the free surfaces, formed in the process of producing pre-thinned specimens, play an important role in influencing the behaviors of dislocation loops. Similar characterizations were conducted at high fluence levels where Xe gas bubbles can be clearly observed. Xe gas bubbles were observed to form by a multi-atom nucleation process and they were immobile throughout the irradiation process at both temperatures. Measurements on both the number density and the size of dislocation loops and gas bubbles were taken. The results and implications of the measurements are discussed in this paper.
2019-02-01T05:42:16Z
2019-02-01T05:42:16Z
2013-06-30
Article
Yun, D., Kirk, M. A., Baldo, P. M., Rest, J., Yacout, A. M., & Insepov, Z. Z. (2013). In situ TEM investigation of Xe ion irradiation induced defects and bubbles in pure molybdenum single crystal. Journal of Nuclear Materials, 437(1-3), 240-249. https://doi.org/10.1016/j.jnucmat.2013.01.305
00223115
https://www.sciencedirect.com/science/article/pii/S0022311513003462
http://nur.nu.edu.kz/handle/123456789/3719
en
Journal of Nuclear Materials
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Published by Elsevier B.V.
Attribution-NonCommercial-ShareAlike 3.0 United States
Journ al of Nuclear Materials
oai:nur.nu.edu.kz:123456789/37202019-02-04T06:11:55Zcom_123456789_127col_123456789_2365
2019-02-01T11:21:51Z
urn:hdl:123456789/3720
Multiscale simulation models of Xe bubble formation in irradiated Mo
Starikov, S. V.
Yun, D.
Yacout, A. M.
Insepov, Z.
Multiscale simulation models for Xe bubble
nucleation and growth in irradiated Mo were developed
that consist Ab-initio calculations of the interatomic
potentials for the Mo and Xe-Mo systems, atomistic MD
simulations of the kinetic rate coefficients of radiation
defects, and nucleation mechanisms of Xe bubbles in Mo.
Simulations of various Xe concentrations, temperatures
and pressures were carried out. A critical concentration of
Xe atoms was determined at which the nucleation occurs
spontaneously.
2019-02-01T11:21:51Z
2019-02-01T11:21:51Z
2012
Article
Insepov, Z., Starikov, S. V., Yun, D., & Yacout, A. M. (2012). Multiscale simulation models of Xe bubble formation in irradiated Mo. Transactions of the American Nuclear Society, 106, 1374-1375.
http://nur.nu.edu.kz/handle/123456789/3720
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Transactions of the American Nuclear Society
oai:nur.nu.edu.kz:123456789/37212019-02-04T21:00:29Zcom_123456789_127col_123456789_2365
2019-02-04T06:08:33Z
urn:hdl:123456789/3721
Atomistic and Kinetic Simulations of Radiation Damage in Molybdenum
Rest, J.
Yacout, A. M.
Ye, B.
Yun, D.
Kuksin, A. Y.
Norman, G. E.
Stegailov, V. V.
Yanilkin, A. V.
Insepov, Z.
A new Mo potential, developed recently by using an ab initio quantum mechanics theory, was used to study formation and time evolution of radiation defects, such as self-interstitial atoms (SIAs), vacancies, and small clusters of SIAs, using molecular dynamics (MD). MD models were developed for calculation of the diffusion coefficients of vacancies, self-interstitials, and small dislocation loops containing 2 to 37 SIAs; and the rate constants were calculated. Interactions of small SIA loops with SIAs were simulated. The results show that rotation of SIA from one 〈111〉 to another equivalent direction is an important mechanism that significantly contributes to kinetic coefficients.
2019-02-04T06:08:33Z
2019-02-04T06:08:33Z
2012-04
Article
Insepov, Z., Rest, J., Yacout, A. M., Ye, B., Yun, D., Kuksin, A. Y., ... Yanilkin, A. V. (2012). Atomistic and kinetic simulations of radiation damage in molybdenum. In Actinides and Nuclear Energy Materials (Vol. 1444, pp. 15-21) https://doi.org/10.1557/opl.2012.1478
http://nur.nu.edu.kz/handle/123456789/3721
https://dx.doi.org/10.1557/opl.2012.1478
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
2012 MRS Spring Meeting
oai:nur.nu.edu.kz:123456789/37242019-03-11T09:49:41Zcom_123456789_127col_123456789_2365
2019-02-05T10:04:25Z
urn:hdl:123456789/3724
Systems-Level Characterization of Microchannel Plate Detector Assemblies, using a Pulsed sub-Picosecond Laser
Wetstein, M.
Adams, B.
Chollet, Matthieu
Webster, Preston
Jokela, Slade
Veryovkin, Igor
Zinovev, Alex
Elam, Jeffrey
Mane, Anil
Peng, Qing
Frisch, Henry
Insepov, Z.
Abstract Microchannel plate photomultiplier tubes (MCP-PMTs) are compact imaging detectors, capable of micron-level spatial imaging and timing measurements with resolutions well below 10 picoseconds. The Large Area Picosecond Photodetector Collaboration (LAPPD) is developing techniques for fabricating 8“x8”, thin, planar, glass-body MCP-PMTs at costs comparable to traditional PMTs. Collaboration between the High Energy Physics Division and the Advanced Photon Source (APS) at Argonne National Laboratory (ANL) has produced an advanced channel-plate characterization facility for testing the time response of MCPs using a pulsed laser capable of sub-picosecond pulses. The MCPs are tested in stacks of one or two plates with a simple photocathode and coupled to a microstripline anode board. LAPPD-made MCPs have already demonstrated gains larger than 105 and promising time resolving capabilities. These measurements will guide the systems-level optimization of LAPPD detectors and the development of signal processing algorithms. Predictions made by the LAPPD simulations group based on electron emmission properties of the MCP pore surface are compared with these tests to help further our understanding of MCP performance.
2019-02-05T10:04:25Z
2019-02-05T10:04:25Z
2012-12-31
Article
Wetstein, M. et.al. (2012) Systems-Level Characterization of Microchannel Plate Detector Assemblies, using a Pulsed sub-Picosecond Laser. Physics Procedia
18753892
https://www.sciencedirect.com/science/article/pii/S1875389212017543
http://nur.nu.edu.kz/handle/123456789/3724
en
Physics Procedia
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Copyright © 2012 Published by Elsevier B.V.
Attribution-NonCommercial-ShareAlike 3.0 United States
Physics Procedia
oai:nur.nu.edu.kz:123456789/40132019-07-19T21:00:31Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T04:41:17Z
urn:hdl:123456789/4013
Photometric Supernovae Redshift Systematics Requirements [Article]
Linder, Eric V.
Mitra, Ayan
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Imaging surveys will find many tens to hundreds of thousands of Type Ia supernovae in the next decade, and measure their light curves. In addition to a need for characterizing their types and subtypes, a redshift is required to place them on a Hubble diagram to map the cosmological expansion. We investigate the requirements on redshift systematics control in order not to bias cosmological results, in particular dark energy parameter estimation. We find that additive and multiplicative systematics must be constrained at the few ×10^(−3) level, effectively requiring spectroscopic followup for robust use of photometric supernovae. Catastrophic outliers need control at the subpercent level. We also investigate sculpting the spectroscopic sample.
2019-07-19T04:41:17Z
2019-07-19T04:41:17Z
2019-07-03
Article
Linder, E.V.,& Mitra, A. (2019, July). Photometric Supernovae Redshift Systematics Requirements. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1907.00985.pdf
http://nur.nu.edu.kz/handle/123456789/4013
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40142019-07-19T21:00:22Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T05:08:25Z
urn:hdl:123456789/4014
Modified Gravity Away from a Lambda CDM Background [Article]
Brando, Guilherme
Falciano, Felipe T.
Linder, Eric V.
Velten, Hermano E. S.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Within the effective field theory approach to cosmic acceleration, the background expansion can be specified separately from the gravitational modifications. We explore the impact of modified gravity in a background different from a cosmological constant plus cold dark matter (ΛCDM) on the stability and cosmological observables, including covariance between gravity and expansion parameters. In No Slip Gravity the more general background allows more gravitational freedom, including both positive and negative Planck mass running. We examine the effects on cosmic structure growth, as well as showing that a viable positive integrated Sachs-Wolfe effect crosscorrelation
easily arises from this modified gravity theory.
2019-07-19T05:08:25Z
2019-07-19T05:08:25Z
2019-05-01
Article
Brando, G., Falciano, F.T, Linder, E.V., & Velten, H. (2019). Modified Gravity Away from a Lambda CDM Background. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1904.12903.pdf
http://nur.nu.edu.kz/handle/123456789/4014
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40152019-07-19T21:00:43Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T05:34:38Z
urn:hdl:123456789/4015
Debiasing Cosmic Gravitational Wave Sirens [Article]
Keeley, Ryan E.
Shafieloo, Arman
L'Huillier, Benjamin
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Accurate estimation of the Hubble constant, and other cosmological parameters, from distances measured by cosmic gravitational wave sirens requires sufficient allowance for the dark energy evolution. We demonstrate how model independent statistical methods, specifically Gaussian process regression, can remove bias in the reconstruction of H(z), and can be combined model independently with supernova distances.
2019-07-19T05:34:38Z
2019-07-19T05:34:38Z
2019-05-27
Article
Eric V.Linder et al. (2019). Debiasing Cosmic Gravitational Wave Sirens. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1905.10216.pdf
http://nur.nu.edu.kz/handle/123456789/4015
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40162019-07-19T21:00:37Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T05:43:35Z
urn:hdl:123456789/4016
Developments in Cosmic Growth and Gravitation [Article]
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Cosmic surveys of large scale structure have imaged hundreds of millions of galaxies and mapped the 3D positions of over a million. Surveys starting over the next few years will increase these numbers more than tenfold. Simultaneously, developments in extracting information on dark energy, dark matter, neutrinos, and gravity on cosmic scales have advanced greatly, with many important works from Asian institutions.
2019-07-19T05:43:35Z
2019-07-19T05:43:35Z
2019-04-23
Article
Linder, E.V. (2019). Developments in Cosmic Growth and Gravitation. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/ftp/arxiv/papers/1904/1904.10544.pdf
http://nur.nu.edu.kz/handle/123456789/4016
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40172019-07-19T21:00:41Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T05:52:23Z
urn:hdl:123456789/4017
On the Use of Fast Radio Burst Dispersion Measures as Distance Measures[Article]
Kumar, Pawan
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Fast radio bursts appear to be cosmological signals whose frequency-time structure provides a dispersion measure. The dispersion measure is a convolution of the cosmic distance element and the electron density, and contains the possibility of using these events as new cosmological distance measures. We explore the challenges of extracting the distance in a robust manner, and estimate the systematics control needed for fast radio bursts to become a competitive distance probe. The methodology can also be applied to their use for mapping electron density fluctuations or helium reionization.
2019-07-19T05:52:23Z
2019-07-19T05:52:23Z
2019-03-19
Article
Kumar, P. & Linder, E.V. (2019). On the Use of Fast Radio Burst Dispersion Measures as Distance Measures. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1903.08175.pdf
http://nur.nu.edu.kz/handle/123456789/4017
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40182019-07-19T21:00:46Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T05:56:40Z
urn:hdl:123456789/4018
No Run Gravity[Article]
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Considering the dark energy/gravity landscape if next generation surveys of galaxies, cosmic microwave background radiation, and gravitational waves do not find clear modification of gravity, we develop No Run Gravity as a counterexample to the conclusion that this would imply general relativity with an expansion history described by an equation of state w(z). No Run Gravity is a cubic Horndeski theory with a constant Planck mass, no gravitational slip, and no modification of gravitational waves, but a rich phenomenology beyond w(z). We calculate the evolution of gravitational strength, sound speed, and cosmic growth within the theory and project sensitivities for upcoming DESI redshift space distortion data.
2019-07-19T05:56:40Z
2019-07-19T05:56:40Z
2019-03-05
Article
Linder, E.V. (2019). No Run Gravity. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1903.02010.pdf
http://nur.nu.edu.kz/handle/123456789/4018
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40192019-07-19T21:00:44Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T06:01:28Z
urn:hdl:123456789/4019
Will Gravitational Wave Sirens Determine the Hubble Constant? [Article]
Shafieloo, Arman
Keeley, Ryan E.
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
Lack of knowledge about the background expansion history of the Universe from independent observations makes it problematic to obtain a precise and accurate estimation of the Hubble constant H0 from gravitational wave standard sirens, even with electromagnetic counterpart redshifts. Simply fitting simultaneously for the matter density in a flat \lcdm\ model can reduce the precision on H0 from 1\% to 5\%, while not knowing the actual background expansion model of the universe (e.g.\ form of dark energy) can introduce substantial bias in estimation of the Hubble constant. When the statistical precision is at the level of 1\% uncertainty on H0, biases in non-\lcdm\ cosmologies that are consistent with current data could reach the 3σ level. To avoid model-dependent biases, statistical techniques that are appropriately agnostic about model assumptions need to be employed.
2019-07-19T06:01:28Z
2019-07-19T06:01:28Z
2018-12-19
Article
Shafieloo, A., Keeley, R.E. & Linder, E.V. (2019). Will Gravitational Wave Sirens Determine the Hubble Constant? The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1812.07775.pdf
http://nur.nu.edu.kz/handle/123456789/4019
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40202019-07-19T21:00:48Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T10:31:33Z
urn:hdl:123456789/4020
Model independent expansion history from supernovae: Cosmology versus systematics
L'Huillier, Benjamin
Shafieloo, Arman
Linder, Eric V.
Kim, Alex G.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
We examine the Pantheon supernovae distance data compilation in a model independent analysis to test the validity of cosmic history reconstructions beyond the concordance ΛCDM cosmology. Strong deviations are allowed by the data at z≳1 in the reconstructed Hubble parameter, Om diagnostic, and dark energy equation of state. We explore three interpretations: 1) possibility of the true cosmology being far from ΛCDM, 2) supernovae property evolution, and 3) survey selection effects.
2019-07-19T10:31:33Z
2019-07-19T10:31:33Z
2019-03-05
Article
L’Huillier, B., Shafieloo, A., Linder, E.V. &Kim, A.G. (2019) Model independent expansion history from supernovae: Cosmology versus systematics. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1812.03623.pdf
http://nur.nu.edu.kz/handle/123456789/4020
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40212019-07-19T21:00:39Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-19T11:02:56Z
urn:hdl:123456789/4021
No Slip CMB
Brush, Micah
Linder, Eric V.
Zumalacárregui, Miguel
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
No Slip Gravity is a simple modified gravity theory with only one free function and the interesting characteristic that -- unlike many modified gravity theories -- it suppresses growth. This allows it to fit current redshift space distortion and σ8 mass fluctuation amplitude data better than ΛCDM in general relativity, while retaining a ΛCDM background expansion and hence distances. Since it has no gravitational slip it alters equally CMB lensing and matter density growth, and in addition affects the CMB gravitational wave B-mode polarization power spectrum. We investigate and compute the effects of No Slip Gravity for CMB lensing and B-modes, and present a simple analytic approximation. Using a Monte Carlo analysis, we place constraints on the theory from current CMB data.
2019-07-19T11:02:56Z
2019-07-19T11:02:56Z
2018-10-29
Article
Brush, M., Linder, E.V. & Miguel Zumalacárregui, No Slip CMB. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1810.12337.pdf
http://nur.nu.edu.kz/handle/123456789/4021
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40222019-07-20T05:01:17Zcom_123456789_2466com_123456789_127col_123456789_4005oai:nur.nu.edu.kz:123456789/40232019-07-20T21:00:34Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:07:57Z
urn:hdl:123456789/4023
The End of Cosmic Growth
Linder, Eric V.
Polarski, David
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
The growth of large scale structure is a battle between gravitational attraction and cosmic acceleration. We investigate the future behavior of cosmic growth under both general relativity (GR)and modified gravity during prolonged acceleration, deriving analytic asymptotic behaviors and showing that gravity generally loses and growth ends. We also note the “why now” problem is equally striking when viewed in terms of the shut down of growth. For many models inside GR the gravitational growth indexγalso shows today as a unique time between constant behavior in the past and a higher asymptotic value in the future. Interestingly, while f(R) models depart in this respect dramatically from GR today and in the recent past, their growth indices are identical in the asymptotic future and past.
2019-07-20T05:07:57Z
2019-07-20T05:07:57Z
2018-10-24
Article
Linder, E.V. & Polarski, D. (2018). The End of Cosmic Growth. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1810.10547.pdf
http://nur.nu.edu.kz/handle/123456789/4023
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40242019-07-20T21:00:32Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:13:26Z
urn:hdl:123456789/4024
Gravity’s Islands: Parametrizing Horndeski Stability
Denissenya, Mikhail
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publication, 2019
Cosmic acceleration may be due to modified gravity, with effective field theory or property functions describing the theory. Connection to cosmological observations through practical parametrization of these functions is difficult and also faces the issue that not all assumed time dependence or parts of parameter space give a stable theory. We investigate the relation between parametrization and stability in Horndeski gravity, showing that the results are highly dependent on the function parametrization. This can cause misinterpretations of cosmological observations, hiding and even ruling out key theoretical signatures. We discuss approaches and constraints that can be placed on the property functions and scalar sound speed to preserve some observational properties, but find that parametrizations closest to the observations, e.g. in terms of the gravitational strengths, offer more robust physical interpretations. In addition we present an example of how future observations of the B-mode polarization of the cosmic microwave background from primordial gravitational wave scan probe different aspects of gravity
2019-07-20T05:13:26Z
2019-07-20T05:13:26Z
2018-07-31
Article
Denissenya, M. & Linder, E.V. (2018). Gravity's Islands: Parametrizing Horndeski Stability. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1808.00013.pdf
http://nur.nu.edu.kz/handle/123456789/4024
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40252019-07-20T21:00:24Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:18:15Z
urn:hdl:123456789/4025
Finite Energy but Infinite Entropy Production from Moving Mirrors
Good, Michael R.R.
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publication, 2019
Accelerating mirrors provide a simple conceptual laboratory for studying particle production and the relation between trajectory and particle, energy, and entropy fluxes. We focus on the relation between energy and entropy, studying some special cases with finite total energy but infinite integrated entropy (though the entropy flux may be finite at any particular moment). We present a new asymptotically static moving mirror trajectory with solvable beta Bogolyubov coefficients, total energy and fully relativistic particle count. The integrated entropy diverges despite finite global radiative particle and energy emission. Another class of models includes exponentially accelerated mirrors in proper time; one of its unexpected behaviors is finite energy emission but divergent entropy. We compare mirrors exponentially accelerated in other coordinates as well, showing their close relation and an interesting duality property.
2019-07-20T05:18:15Z
2019-07-20T05:18:15Z
2018-07-20
Article
Linder, E.V. & Good, M.R.R. (2018). Finite Energy but Infinite Entropy Production from Moving Mirrors. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1807.08632.pdf
http://nur.nu.edu.kz/handle/123456789/4025
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40262019-07-20T21:00:44Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:28:44Z
urn:hdl:123456789/4026
GW170817 Most Likely Made a Black Hole
Pooley, David
Kumar, Pawan
Wheeler, J. Craig
Grossan, Bruce
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication, 2019
There are two outstanding issues regarding the neutron-star merger event GW170817: the nature of the compact remnant and the interstellar shock. The mass of the remnant of GW170817, ∼2.7 M⊙, implies the remnant could be either a massive, rotating, neutron star, or a black hole. We report Chandra Director's Discretionary Time observations made in 2017 December and 2018 January, and we reanalyze earlier observations from 2017 August and 2017 September, in order to address these unresolved issues. We estimate the X-ray flux from a neutron star remnant and compare that to the measured X-ray flux. If we assume that the spin-down luminosity of any putative neutron star is converted to pulsar wind nebula X-ray emission in the 0.5-8 keV band with an efficiency of 10−3, for a dipole magnetic field with 3×1011 G < B < 1014 G, a rising X-ray signal would result and would be brighter than that observed by day 107, we therefore conclude that the remnant of GW170817 is most likely a black hole. Independent of any assumptions of X-ray efficiency, however, if the remnant is a rapidly-rotating, magnetized, neutron star, the total energy in the external shock should rise by a factor ∼102 (to ∼1052 erg) after a few years, therefore, Chandra observations over the next year or two that do not show substantial brightening will rule out such a remnant. The same observations can distinguish between two different models for the relativistic outflow, either an angular or radially varying structure.
2019-07-20T05:28:44Z
2019-07-20T05:28:44Z
2018-05-14
Article
Pooley, D., Kumar, P., Wheeler, C. & Grossan, B. (2018). GW170817 Most Likely Made a Black Hole. 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1712.03240.pdf
http://nur.nu.edu.kz/handle/123456789/4026
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40272019-07-20T21:00:46Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:35:37Z
urn:hdl:123456789/4027
The Well-Tempered Cosmological Constant
Appleby, Stephen
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication
Self tuning is one of the few methods for dynamically cancelling a large cosmological constantand yet giving an accelerating universe. Its drawback is that it tends to screen all sources of energydensity, including matter. We develop a model that tempers the self tuning so the dynamical scalarfield still cancels an arbitrary cosmological constant, including the vacuum energy through any highenergy phase transitions, without affecting the matter fields. The scalar-tensor gravitational actionis simple, related to cubic Horndeski gravity, with a nonlinear derivative interaction plus a tadpoleterm. Applying shift symmetry and using the property of degeneracy of the field equations we findfamilies of functions that admit de Sitter solutions with expansion rates that are independent ofthe magnitude of the cosmological constant and preserve radiation and matter dominated phases. That is, the method can deliver a standard cosmic history including current acceleration, despite the presence of a Planck scale cosmological constant.
2019-07-20T05:35:37Z
2019-07-20T05:35:37Z
2018-05-01
Article
Appleby, S. & Linder, E.V. (2018). The Well-Tempered Cosmological Constant. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1805.00470.pdf
http://nur.nu.edu.kz/handle/123456789/4027
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
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NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40282019-07-20T21:01:18Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:51:05Z
urn:hdl:123456789/4028
Dark Energy from α-attractors: Phenomenology and Observational Constraints
Garcia-Garcia, Carlos
Linder, Eric V.
Ruiz-Lapuente, Pilar
Zumalacaregui, Miguel
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publication
The possibility of linking inflation and late cosmic accelerated expansion using the α-attractor models has received increasing attention due to their physical motivation. In the early universe, α-attractors provide an inflationary mechanism compatible with Planck satellite CMB observations and predictive for future gravitational wave CMB modes. Additionally α-attractors can be written as quintessence models with a potential that connects a power law regime with a plateau or uplifted exponential, allowing a late cosmic accelerated expansion that can mimic behavior near a cosmological constant. In this paper we study a generalized dark energy α-attractor model. We thoroughly investigate its phenomenology, including the role of all model parameters and the possibility of large-scale tachyonic instability clustering. We verify the relation that 1+w∼1/α (while the gravitational wave power r∼α) so these models predict that a signature should appear in either the primordial B-modes or in late time deviation from a cosmological constant. We constrain the model parameters with current datasets, including the cosmic microwave background (Planck 2015 compressed likelihood), baryon acoustic oscillations (BOSS DR12) and supernovae (Pantheon compressed). Our results show that expansion histories close to a cosmological constant exist in large regions of the parameter space, not requiring a fine-tuning of the parameters or initial conditions.
2019-07-20T05:51:05Z
2019-07-20T05:51:05Z
2018-03-01
Article
Garcia-Garcia, C., Linder, E.V., Ruiz-Lapuente, P. & Zumalacaregui, M. (2018). Dark Energy from α-attractors: Phenomenology and Observational Constraints. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1803.00661v1.pdf
http://nur.nu.edu.kz/handle/123456789/4028
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40292019-07-20T21:01:19Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T05:59:16Z
urn:hdl:123456789/4029
Reinterpreting Low Frequency LIGO/Virgo Events as Magnified Stellar-Mass Black Holes at Cosmological Distances
Broadhurst, Tom
Diego, Jose M.
Smoot III, George
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publication
Gravitational waves can be focussed by the gravity of an intervening galaxy, just like light, thereby magnifying binary merging events in the far Universe. High magnification by galaxies is found to be responsible for the brightest sources detected in sky surveys, but the low angular resolution of LIGO/Virgo is insufficient to check this lensing possibility directly. Here we find that the first six binary black hole (BBH) merging events reported by LIGO/Virgo show clear evidence for lensing in the plane of observed mass and source distance. The four lowest frequency events follow an apparent locus in this plane, which we can reproduce by galaxy lensing, where the higher the magnification, the generally more distant the source so the wave train is stretched more by the Universal expansion, by factors of 2-4. This revises the reported BBH distances upwards by an order of magnitude, equal to the square root of the magnification. Furthermore, the reported black hole masses must be decreased by 2-4 to counter the larger stretch factor, since the orbital frequency is used to derive the black hole masses. This lowers the masses to 5-15 solar masses, well below the puzzlingly high values of 20-35 solar masses otherwise estimated, with the attraction of finding agreement in mass with black holes orbiting stars in our own Galaxy, thereby implying a stellar origin for the low frequency events in the far Universe. We also show that the other two BBH events of higher frequency detected by LIGO/VIRGO, lie well below the lensing locus, consistent with being nearby and unlensed. If this apparent division between local and distant lensed events is reinforced by new detections then the spins and masses of stellar black holes can be compared over a timespan of 10 billion years by LIGO/Virgo.
2019-07-20T05:59:16Z
2019-07-20T05:59:16Z
2018-02-14
Article
Broadhurst, T., Diego, J.M. & Smoot III, G. (2018). Reinterpreting Low Frequency LIGO/Virgo Events as Magnified Stellar-Mass Black Holes at Cosmological Distances. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1802.05273.pdf
http://nur.nu.edu.kz/handle/123456789/4029
en
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Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40302019-07-20T21:01:24Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T07:56:50Z
urn:hdl:123456789/4030
Cosmic Curvature Tested Directly from Observations
Denissenya, Mikhail
Linder, Eric V.
Shafieloo, Arman
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publication
Cosmic spatial curvature is a fundamental geometric quantity of the Universe. We investigate a model independent, geometric approach to measure spatial curvature directly from observations,without any derivatives of data. This employs strong lensing time delays and supernova distance measurements to measure the curvature itself, rather than just testing consistency with flatness.We define two curvature estimators, with differing error propagation characteristics, that can cross-check each other, and also show how they can be used to map the curvature in redshift slices, totest constancy of curvature as required by the Robertson-Walker metric. Simulating realizations ofredshift distributions and distance measurements of lenses and sources, we estimate uncertainties onthe curvature enabled by next generation measurements. Theresults indicate that the model independent methods, using only geometry without assuming forms for the energy density constituents,can determine the curvature at the∼6×10^−3 level.
2019-07-20T07:56:50Z
2019-07-20T07:56:50Z
2018-02-13
Article
Denissenya, M., Linder, E.V. & Shafieloo, A. (2018). Cosmic Curvature Tested Directly from Observations. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1802.04816.pdf
http://nur.nu.edu.kz/handle/123456789/4030
en
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Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40312019-07-20T21:01:26Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T08:02:29Z
urn:hdl:123456789/4031
No Slip Gravity
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
A subclass of the Horndeski modified gravity theory we call No Slip Gravity has particularly interesting properties: 1) a speed of gravitational wave propagation equal to the speed of light, 2) equality between the effective gravitational coupling strengths to matter and light, G matter and G light, hence no slip between the metric potentials, yet difference from Newton's constant, and 3) suppressed growth to give better agreement with galaxy clustering observations. We explore the characteristics and implications of this theory, and project observational constraints. We also give a simple expression for the ratio of the gravitational wave standard siren distance to the photon standard candle distance, in this theory and others, and enable a direct comparison of modified gravity in structure growth and in gravitational waves, an important crosscheck.
2019-07-20T08:02:29Z
2019-07-20T08:02:29Z
2018-01-04
Article
Linder, E.V. (2018). No Slip Gravity. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1801.01503.pdf
http://nur.nu.edu.kz/handle/123456789/4031
en
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NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40322019-07-20T21:01:20Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T08:07:51Z
urn:hdl:123456789/4032
Eternal and Evanescent Black Holes: It’s All Done With Mirrors
Good, Michael R.R.
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
The analogy between black hole radiation and accelerating mirror radiation (the dynamical Casimir effect) is particularly strong for mirror trajectories giving rise to a constant thermal flux of particles. We present new ways to achieve such thermal plateaus, and customize their finite, semi-infinite, and eternal presence, corresponding to forming/collapsing, complete-evaporation/remnants,and eternal black holes. We find simple expressions for the energy flux in terms of the mirror rapidity as a function of proper time and null time.
2019-07-20T08:07:51Z
2019-07-20T08:07:51Z
2017-11-27
Article
Linder, E.V. & Good, M.R.R. (2017). Eternal and Evanescent Black Holes: It’s All Done With Mirrors. The 2nd international conference of the Energetic Cosmos Laboratory (ECL) at Nazarbayev University. Retrieved from https://arxiv.org/pdf/1711.09922.pdf
http://nur.nu.edu.kz/handle/123456789/4032
en
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NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40332019-07-20T21:01:23Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T10:19:08Z
urn:hdl:123456789/4033
Vacuum phase transition solves the H0 tension
Di Valentino, Eleonora
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
Taking the Planck cosmic microwave background data and the more direct Hubble constant measurement data as unaffected by systematic offsets, the values of the Hubble constant $H_0$ interpreted within the $\Lambda$CDM cosmological constant and cold dark matter cosmological model are in $\sim 3.3 \sigma$ tension. We show that the Parker vacuum metamorphosis model, physically motivated by quantum gravitational effects and with the same number of parameters as $\Lambda$CDM, can remove the $H_0$ tension, and can give an improved fit to data (up to $\Delta\chi^2=-7.5$). It also ameliorates tensions with weak lensing data and the high redshift Lyman alpha forest data. We separately consider a scale dependent scaling of the gravitational lensing amplitude, such as provided by modified gravity, neutrino mass, or cold dark energy, motivated by the somewhat different cosmological parameter estimates for low and high CMB multipoles. We find that no such scale dependence is preferred.
2019-07-20T10:19:08Z
2019-07-20T10:19:08Z
2018-02-23
Article
Di Valentino, E., Linder, E. V., & Melchiorri, A. (2018). Vacuum phase transition solves the H0 tension. Physical Review D, 97(4). https://doi.org/10.1103/PhysRevD.97.043528
24700029
http://nur.nu.edu.kz/handle/123456789/4033
en
American Physical Society
oai:nur.nu.edu.kz:123456789/40342019-07-20T21:00:52Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T10:34:39Z
urn:hdl:123456789/4034
Probing features in inflaton potential and reionization history with future CMB space observations
Hazra, Dhiraj Kumar
Paoletti, Daniela
Ballardini, Mario
Finelli, Fabio
Shafieloo, Arman
Smoot, George F
Starobinsky, Alexei A.
CMBR experiments
CMBR polarization
inflation
reionization
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
We consider the prospects of probing features in the primordial power spectrum with future Cosmic Microwave Background (CMB) polarization measurements. In the scope of the inflationary scenario, such features in the spectrum can be produced by local non-smooth pieces in an inflaton potential (smooth and quasi-flat in general) which in turn may originate from fast phase transitions during inflation in other quantum fields interacting with the inflaton. They can fit some outliers in the CMB temperature power spectrum which are unaddressed within the standard inflationary ΛCDM model. We consider Wiggly Whipped Inflation (WWI) as a theoretical framework leading to improvements in the fit to the Planck 2015 temperature and polarization data in comparison with the standard inflationary models, although not at a statistically significant level. We show that some type of features in the potential within the WWI models, leading to oscillations in the primordial power spectrum that extend to intermediate and small scales can be constrained with high confidence (at 3σ or higher confidence level) by an instrument as the Cosmic ORigins Explorer (CORE). In order to investigate the possible confusion between inflationary features and footprints from the reionization era, we consider an extended reionization history with monotonic increase of free electrons with decrease in redshift. We discuss the present constraints on this model of extended reionization and future predictions with CORE. We also project, to what extent, this extended reionization can create confusion in identifying inflationary features in the data.
2019-07-20T10:34:39Z
2019-07-20T10:34:39Z
2018-03-04
Article
Hazra, D. K., Paoletti, D., Ballardini, M., Finelli, F., Shafieloo, A., Smoot, G. F., & Starobinsky, A. A. (2018). Probing features in inflaton potential and reionization history with future CMB space observations. Journal of Cosmology and Astroparticle Physics, 2018(2). https://doi.org/10.1088/1475-7516/2018/02/017
http://nur.nu.edu.kz/handle/123456789/4034
en
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NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40352019-07-20T21:00:58Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T10:41:23Z
urn:hdl:123456789/4035
Subpercent Accurate Fitting of Modified Gravity Growth
Denissenya, Mikhail
Linder, Eric V.
galaxy clustering
modified gravity
redshift surveys
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
Adding to our previous method for dealing with gravitational modifications at redshiftz&3through a single parameter, we investigate treatment of lower redshift modifications to linear growth observables. We establish sub percent accurate fits to the redshift space distortion observablefσ8(a)using two parameters binned in redshift, testing the results for modifications with time dependence that rises, falls, is nonmonotonic, is multipeaked, and corresponds to f(R) and braneworld gravity. The residuals are then propagated to cosmological parameter biases for DESI observations, and found to cause a shift in the dark energy joint confidence contour by less than the equivalent of∼0.1σ. The proposed 2–3 parameter modified gravity description also can reveal physical characteristics of the underlying theory.
2019-07-20T10:41:23Z
2019-07-20T10:41:23Z
2017-09-25
Article
Denissenya, M., & Linder, E. V. (2017). Subpercent accurate fitting of modified gravity growth. Journal of Cosmology and Astroparticle Physics, 2017(11), 1–8. https://doi.org/10.1088/1475-7516/2017/11/052
14757516
http://nur.nu.edu.kz/handle/123456789/4035
en
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NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40362019-07-20T21:01:05Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T10:47:29Z
urn:hdl:123456789/4036
Witnessing the reionization history using Cosmic Microwave Background observation from Planck
Hazra, Dhiraj Kumar
Smoot, George F
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory. ECL Publications
We constrain the history of reionization using the data from Planck 2015 Cosmic Microwave Background (CMB) temperature and polarization anisotropy observations. We also use prior constraints on the reionization history at redshifts ∼7−8 obtained from Lyman-α emission observations. Using the free electron fractions at different redshifts as free parameters, we construct the complete reionization history using polynomials. Our construction provides an extremely flexible framework to search for the history of reionization as a function of redshifts. We present a conservative and an optimistic constraint on reionization that are categorized by the flexibilities of the models and datasets used to constrain them, and we report that CMB data marginally favors extended reionization histories. In both the cases, we find the mean values of optical depth to be larger (≈0.09 and 0.1) than what we find in standard steplike reionization histories (0.079±0.017). At the same time we also find that the maximum free electron fraction allowed by the data for redshifts more than 15 is ∼0.25 at 95.4\% confidence limit in the case of optimistic constraint.
2019-07-20T10:47:29Z
2019-07-20T10:47:29Z
2017-12-11
Article
Hazra, D. K., & Smoot, G. F. (2017). Witnessing the reionization history using Cosmic Microwave Background observation from Planck. 0–13. arXiv:1708.04913v2
http://nur.nu.edu.kz/handle/123456789/4036
en
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NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40372019-07-20T21:00:59Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T10:52:25Z
urn:hdl:123456789/4037
Slicing the vacuum: New accelerating mirror solutions of the dynamical Casimir effect
Good, Michael R.R.
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
Radiation from accelerating mirrors in a Minkowski spacetime provides insights into the nature of horizons, black holes, and entanglement entropy. We introduce new, simple, symmetric and analytic moving mirror solutions and study their particle, energy, and entropy production. This includes an asymptotically static case with finite emission that is the black hole analog of complete evaporation. The total energy, total entropy, total particles, and spectrum are the same on both sides of the mirror. We also study its asymptotically inertial, drifting analog (which gives a black hole remnant) to explore differences in finite and infinite production.
2019-07-20T10:52:25Z
2019-07-20T10:52:25Z
2017-12-22
Article
Good, M. R. R., & Linder, E. V. (2017). Slicing the vacuum: New accelerating mirror solutions of the dynamical Casimir effect. Physical Review D, 96(12), 1–9. https://doi.org/10.1103/PhysRevD.96.125010
24700029
http://nur.nu.edu.kz/handle/123456789/4037
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
American Physical Society
oai:nur.nu.edu.kz:123456789/40382019-07-20T21:00:57Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:00:03Z
urn:hdl:123456789/4038
Accelerated Parameter Estimation with DALE X
Daniel, Scott F.
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
We consider methods for improving the estimation of constraints on a high-dimensional parameter space with a computationally expensive likelihood function. In such cases Markov chain Monte Carlo (MCMC) can take a long time to converge and concentrates on finding the maxima rather than the often-desired confidence con-tours for accurate error estimation. We employ DALEχ(Direct Analysis of Limits via the Exterior ofχ2) for determining confidence contours by minimizing a cost function parametrized to incentivize points in parameter space which are both on the confidence limit and far from previously sampled points. We compare DALEχ to the nested sampling algorithm implemented in MultiNest on a toy likelihood function that is highly non-Gaussian and non-linear in the mapping between parameter values and χ2. We find that in high-dimensional cases DALEχfinds the same confidence limit as Multi-Nest using roughly an order of magnitude fewer evaluations of the likelihood function.DALE χ is open-source and available athttps://github.com/danielsf/Dalex.git.
2019-07-20T11:00:03Z
2019-07-20T11:00:03Z
2017-05-08
Article
Daniel, S. F., & Linder, E. V. (2017). Accelerated Parameter Estimation with DALE X. (2017), 1–36. Retrieved from http://arxiv.org/abs/1705.02007
1705.02007
http://nur.nu.edu.kz/handle/123456789/4038
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40392019-07-20T21:00:36Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:04:38Z
urn:hdl:123456789/4039
Constraining dark energy dynamics in extended parameter space
Di Valentino, Eleonora
Melchiorri, Alessandro
Linder, Eric V.
Silk, Joseph
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
Dynamical dark energy has been recently suggested as a promising and physical way to solve the 3 sigma tension on the value of the Hubble constant H0 between the direct measurement of Riess et al. (2016) (R16, hereafter) and the indirect constraint from cosmic microwave anisotropies obtained by the Planck satellite under the assumption of a ΛCDM model. In this paper, by parametrizing dark energy evolution using the w0−wa approach, and considering a 12 parameter extended scenario, we find that: (a) the tension on the Hubble constant can indeed be solved with dynamical dark energy, (b) a cosmological constant is ruled out at more than 95% c.l. by the Planck+R16 dataset, and (c) all of the standard quintessence and half of the “downward going” dark energy model space (characterized by an equation of state that decreases with time) is also excluded at more than 95% c.l. These results are further confirmed when cosmic shear, CMB lensing, or SN Ia luminosity distance data are also included. The best fit value of the χ2 for the Planck+R16 data set improves by Δχ2=−12.9 when moving to 12 parameters respect to standard ΛCDM. However, tension remains with the BAO dataset. A cosmological constant and small portion of the freezing quintessence models are still in agreement with the Planck+R16+BAO data set at between 68% and 95% c.l. Conversely, for Planck plus a phenomenological H0 prior, both thawing and freezing quintessence models prefer a Hubble constant of less than 70 km/s/Mpc. The general conclusions hold also when considering models with nonzero spatial curvature.
2019-07-20T11:04:38Z
2019-07-20T11:04:38Z
2017-07-19
Article
Di Valentino, E., Melchiorri, A., Linder, E. V., & Silk, J. (2017). Constraining dark energy dynamics in extended parameter space. Physical Review D, 96(2), 1–10. https://doi.org/10.1103/PhysRevD.96.023523
doi: 10.1103/PhysRevD.96.023523
http://nur.nu.edu.kz/handle/123456789/4039
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
American Physical Society
oai:nur.nu.edu.kz:123456789/40402019-07-20T21:01:27Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:11:19Z
urn:hdl:123456789/4040
Cosmic Growth Signatures of Modified Gravitational Strength
Denissenya, Mikhail
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
Cosmic growth of large scale structure probes the entire history of cosmic expansion and gravitational coupling. To get a clear picture of the effects of modification of gravity we consider a deviation in the coupling strength (effective Newton’s constant) at different redshifts, with different durations and amplitudes. We derive, analytically and numerically, the impact on the growth rate and growth amplitude. Galaxy redshift surveys can measure a product of these through redshift space distortions and we connect the modified gravity to the observable ina way that may provide a useful parametrization of the ability of future surveys to test gravity. In particular, modifications during the matter-dominated era can be treated by a single parameter, the “area” of the modification, to an accuracy of∼0.3% in the observables. We project constraints on both early and late time gravity for the Dark Energy Spectroscopic Instrument and discuss what is needed for tightening tests of gravity to better than 5% uncertainty
2019-07-20T11:11:19Z
2019-07-20T11:11:19Z
2018-09-05
Article
Denissenya, M., & Linder, E. V. (2018). Cosmic Growth Signatures of Modified Gravitational Strength. 2(1), 1–12. arXiv:1703.00917v1
arXiv:1703.00917v1
http://nur.nu.edu.kz/handle/123456789/4040
en
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Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40412019-07-20T21:01:28Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:15:41Z
urn:hdl:123456789/4041
Λ is Coming: Parametrizing Freezing Fields
Linder, Eric V.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
We explore freezing dark energy, where the evolution of the field approaches that of a cosmological constant at late times. We propose two general, two-parameter forms to describe the class of freezing field models, in analogy to ones for thawing fields, here based on the physics of the flow parameter or the calibrated w-w′ phase space. Observables such as distances and Hubble parameters are fit to within 0.1%, and the dark energy equation of state generally to within better than 1%, of the exact numerical solutions.
2019-07-20T11:15:41Z
2019-07-20T11:15:41Z
2018-03-21
Article
Linder, E. V. (2018). Λ is Coming: Parametrizing Freezing Fields. 2(1), 1–5. arXiv:1701.01445v2
10.1016/j.astropartphys.2017.02.008
http://nur.nu.edu.kz/handle/123456789/4041
en_US
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Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40422019-07-20T21:01:06Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:24:29Z
urn:hdl:123456789/4042
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity
Mueller, Eva-Maria
Percival, Will
Linder, Eric
Alam, Shadab
Zhao, Gong-Bo
Sanchez, Ariel G.
Beutler, Florian
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory. ECL Publications
We use baryon acoustic oscillation and redshift space distortion from the completed
Baryon Oscillation Spectroscopic Survey, corresponding to data release 12 of the Sloan
Digital Sky Survey, combined sample analysis in combination with the cosmic microwave
background, supernova and redshift space distortion measurements from additional
spectroscopic surveys to test deviations from general relativity. We present constraints
on several phenomenological models of modified gravity.
2019-07-20T11:24:29Z
2019-07-20T11:24:29Z
2016-12-02
Article
Mueller, E. M., Percival, W., Linder, E., Alam, S., Zhao, G. B., Sánchez, A. G., (2016). The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: Constraining modified gravity. Monthly Notices of the Royal Astronomical Society, 475(2), 2122–2131. https://doi.org/10.1093/MNRAS/STX3232
13652966
http://nur.nu.edu.kz/handle/123456789/4042
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
American Physical Society
oai:nur.nu.edu.kz:123456789/40432019-07-20T21:01:08Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:34:28Z
urn:hdl:123456789/4043
Cosmic growth and expansion conjoined
Linder, Eric V.
Cosmic acceleration
Growth of large scale structure
Modified gravity
Dark energy
Abstract Cosmological measurements of both the expansion history and growth history have matured, and the two together provide an important test of general relativity. We consider their joint evolutionary track, showing that this has advantages in distinguishing cosmologies relative to considering them individually or at isolated redshifts. In particular, the joint comparison relaxes the shape degeneracy that makes fσ8(z) curves difficult to separate from the overall growth amplitude. The conjoined method further helps visualization of which combinations of redshift ranges provide the clearest discrimination. We examine standard dark energy cosmologies, modified gravity, and “stuttering” growth, each showing distinct signatures.
2019-07-20T11:34:28Z
2019-07-20T11:34:28Z
2017-01-31
Article
09276505
https://www.sciencedirect.com/science/article/pii/S092765051630161X
http://nur.nu.edu.kz/handle/123456789/4043
en
Astroparticle Physics
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
© 2016 Elsevier B.V. All rights reserved.
Attribution-NonCommercial-ShareAlike 3.0 United States
oai:nur.nu.edu.kz:123456789/40442019-07-20T21:01:10Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:43:36Z
urn:hdl:123456789/4044
Reionization in the dark and the light from Cosmic Microwave Background
Hazra, Dhiraj Kumar
Paoletti, Daniela
Finelli, Fabio
Smoot, George F.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
Energetic Cosmos Laboratory (ECL)
ECL19
We explore the constraints on the history of reionization from Planck 2015 CosmicMicrowave Background (CMB) data and we derive the forecasts for future CMB observations.We consider a class of monotonic histories of reionization as parametrized by two additionalextra parameters with respect to the average optical depth used in the instantaneous reion-ization modeling. We investigate the degeneracies between the history of reionization andselected extensions of the standard cosmological model. In particular, we consider the de-generacies with the total mass of the neutrino sector and we discuss the possible correlationbetween the dark matter annihilation and the duration of reionization in the CMB. We usean extension to poly-reion model that was proposed in [1]. We compare the constraints fromPlanck 2015 data with the predicted constraints from possible future CMB mission as Lite-BIRD, and we also use the proposed CORE-like specifications as an example of what higherresolution can bring in addition. We find that the degeneracy between the averaged opticaldepth and the duration of reionization will be substantially removed by both concepts. De-generacies between the reionization history and either the total neutrino mass and propertiesof dark matter annihilation will also be improved by future surveys. We find only marginalimprovement in the constraints on reionization history for the higher resolution in the caseof long duration of reionization.
2019-07-20T11:43:36Z
2019-07-20T11:43:36Z
2018-07-14
Article
Hazra, D. K., Paoletti, D., Finelli, F., & Smoot, G. F. (2018). Reionization in the dark and the light from Cosmic Microwave Background. Journal of Cosmology and Astroparticle Physics, 2018(9). https://doi.org/10.1088/1475-7516/2018/09/016
arXiv:1807.05435v1
http://nur.nu.edu.kz/handle/123456789/4044
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40452019-07-20T21:01:07Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:50:38Z
urn:hdl:123456789/4045
Twin LIGO/Virgo Detections of a Viable Gravitationally-Lensed Black Hole Merger
Broadhurst, Tom
Smoot, George F.
Diego, Jose M.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
We identify a binary black hole (BBH) merger that appears to be multiply lensed by an intervening galaxy. The LIGO/Virgo events GW170809 and GW170814 have indistinguishable waveforms separated by 5 days, and overlap on the sky within the 90\% credible region. Their strain amplitudes are also similar, implying a modest relative magnification ratio, as expected for a pair of lensed gravitational waves. The phase of the two events is also consistent with being the same, adding more evidence in support of both events originating from the same BBH merger. The difference in the published inferred distances of each event can then be interpreted as following from their different magnifications.
2019-07-20T11:50:38Z
2019-07-20T11:50:38Z
2019-01-10
Article
Broadhurst, T., Diego, J. M., & Smoot, G. F. (2019). Twin LIGO/Virgo Detections of a Viable Gravitationally-Lensed Black Hole Merger. 1–18. Retrieved from http://arxiv.org/abs/1901.03190
1901.03190
http://nur.nu.edu.kz/handle/123456789/4045
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/40462019-07-20T21:01:13Zcom_123456789_2466com_123456789_127col_123456789_4005
2019-07-20T11:54:37Z
urn:hdl:123456789/4046
Joining bits and pieces of reionization history
Hazra, Dhiraj Kumar
Paoletti, Daniela
Finelli, Fabio
Smoot, George F.
The 2nd international conference of the Energetic Cosmos Laboratory (ECL)
ECL19
Energetic Cosmos Laboratory (ECL)
Cosmic Microwave Background temperature and polarization anisotropies from Planck have estimated lower value of the optical depth to reionization (τ) compared to WMAP.
2019-07-20T11:54:37Z
2019-07-20T11:54:37Z
2019-04-02
Article
Hazra, D. K., Paoletti, D., Finelli, F., & Smoot, G. F. (2019). Joining bits and pieces of reionization history. Retrieved from http://arxiv.org/abs/1904.01547
1904.01547
http://nur.nu.edu.kz/handle/123456789/4046
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
NURIS; Energetic Cosmos Laboratory
oai:nur.nu.edu.kz:123456789/46012020-05-06T21:00:47Zcom_123456789_127col_123456789_2365
2020-05-06T10:11:34Z
urn:hdl:123456789/4601
Pole dark energy
Linder, E. V.
cosmology
nongalactic astrophysics
Research Subject Categories::NATURAL SCIENCES::Physics::Astronomy and astrophysics::Cosmology
Theories with a pole in the kinetic term have been used to great effect in studying inflation, owing to their quantum stability and attractor properties. We explore the use of such pole kinetic terms in dark energy theories, finding an interesting link between thawing and freezing models, and the possibility of enhanced plateaus with ``superattractor''-like behavior. We assess the observational viability of pole dark energy, showing that simple models can give dark energy equation of state evolution with w(z)<−0.9 even for potentials that could not normally achieve this easily. The kinetic term pole also offers an interesting perspective with respect to the swampland criteria for such observationally viable dark energy models....
2020-05-06T10:11:34Z
2020-05-06T10:11:34Z
2019-11
Article
Linder, E. V. (2019) Pole dark energy. Physical Review. https://doi.org/10.1119/1.5030543
https://doi.org/10.1119/1.5030543
http://nur.nu.edu.kz/handle/123456789/4601
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Physical Review
oai:nur.nu.edu.kz:123456789/46262020-05-11T21:00:55Zcom_123456789_127col_123456789_2365
2020-05-11T06:14:09Z
urn:hdl:123456789/4626
Intelligent voice system for kazakh
Yessenbayev, Z.
Saparkhojayev, N.
Tibeyev, T.
Intelligent voice system
Modern speech technologies are highly advanced and widely used in day-to-day
applications. However, this is mostly concerned with the languages of well-developed
countries such as English, German, Japan, Russian, etc. As for Kazakh, the situation is less prominent and research in this field is only starting to evolve. In this research and applicationoriented project, we introduce an intelligent voice system for the fast deployment of callcenters and information desks supporting Kazakh speech. The demand on such a system is obvious if the country’s large size and small population is considered....
2020-05-11T06:14:09Z
2020-05-11T06:14:09Z
2014-04-04
Article
Yessenbayev, Z., Saparkhojayev, N., Tibeyev, T. (2014) Intelligent voice system for kazakh. Journal of Physics: Conference Series.
https://doi.org/10.1088/1742-6596/495/1/012043
http://nur.nu.edu.kz/handle/123456789/4626
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
Journal of Physics: Conference Series
oai:nur.nu.edu.kz:123456789/46272020-05-11T21:00:40Zcom_123456789_127col_123456789_2365
2020-05-11T06:49:35Z
urn:hdl:123456789/4627
Emptying Water Towers? Impacts of Future Climateand Glacier Change on River Discharge in theNorthern Tien Shan, Central Asia
Zhumabayev, Dauren
Shahgedanova, Maria
Afzal, Muhammad
Hagg, Wilfried
Kapitsa, Vassiliy
Kasatkin, Nikolay
Mayr, Elizabeth
Rybak, Oleg
Saidaliyeva, Zarina
Severskiy, Igor
Usmanova, Zamira
Wade, Andrew
Yaitskaya, Natalia
Research Subject Categories::NATURAL SCIENCES::Earth sciences
mpacts of projected climate and glacier change on river discharge in five glacierized catchments in the northern Tien Shan, Kazakhstan are investigated using a conceptual hydrological model HBV-ETH. Regional climate model PRECIS driven by four different GCM-scenario combinations (HadGEM2.6, HadGEM8.5, A1B using HadCM3Q0 and ECHAM5) is used to develop climate projections. Future changes in glaciation are assessed using the Blatter–Pattyn type higher-order 3D coupled ice flow and mass balance model. All climate scenarios show statistically significant warming in the 21st Century. Neither projects statistically significant change in annual precipitation although HadGEM and HadCM3Q0-driven scenarios show 20–37% reduction in July–August precipitation in 2076–2095 in comparison with 1980–2005. Glaciers are projected to retreat rapidly until the 2050s and stabilize afterwards except under the HadGEM8.5 scenario where retreat continues. Glaciers are projected to lose 38–50% of their volume and 34–39% of their area. Total river discharge in July–August, is projected to decline in catchments with low (2–4%) glacierization by 20–37%. In catchments with high glacierization (16% and over), no significant changes in summer discharge are expected while spring discharge is projected to increase. In catchments with medium glacierization (10–12%), summer discharge is expected to decline under the less aggressive scenarios while flow is sustained under the most aggressive HadGEM8.5 scenario, which generates stronger melt.
2020-05-11T06:49:35Z
2020-05-11T06:49:35Z
2020-02-26
Article
Shahgedanova, M., Afzal, M., Hagg, W., Kapitsa, V., Kasatkin, N., Mayr, E., Rybak, O., et al. (2020). Emptying Water Towers? Impacts of Future Climate and Glacier Change on River Discharge in the Northern Tien Shan, Central Asia. Water, 12(3), 627. MDPI AG. Retrieved from http://dx.doi.org/10.3390/w12030627
https://doi.org/10.3390/w12030627
http://nur.nu.edu.kz/handle/123456789/4627
en
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
MDPI
oai:nur.nu.edu.kz:123456789/47992020-06-24T21:00:32Zcom_123456789_127col_123456789_2365
2020-06-24T08:56:12Z
urn:hdl:123456789/4799
Photon propagation in slowly varying inhomogeneous electromagnetic fields
Karbstein, Felix
Shaisultanov, Rashid
Research Subject Categories::TECHNOLOGY
Photon propagation
electromagnetic fields
photon polarization
Starting from the Heisenberg-Euler effective Lagrangian, we determine the photon current and photon polarization tensor in inhomogeneous, slowly varying electromagnetic fields. To this end, we consider background field configurations varying in both space and time, paying special attention to the tensor structure. As a main result, we obtain compact analytical expressions for the photon polarization tensor in realistic Gaussian laser pulses, as generated in the focal spots of high-intensity lasers. These expressions are of utmost importance for the investigation of quantum vacuum nonlinearities in realistic high-intensity laser experiments.
2020-06-24T08:56:12Z
2020-06-24T08:56:12Z
2015-04
Article
Karbstein, F., & Shaisultanov, R. (2015). Photon propagation in slowly varying inhomogeneous electromagnetic fields. Physical Review D, 91(8). https://doi.org/10.1103/physrevd.91.085027
2470-0010
10.1103/PhysRevD.91.085027
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.085027
https://doi.org/10.1103/PhysRevD.91.085027
http://nur.nu.edu.kz/handle/123456789/4799
en
Physical Review D;
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
American Physical Society
oai:nur.nu.edu.kz:123456789/49292023-11-11T14:45:14Zcom_123456789_2466com_123456789_127col_123456789_4928
2020-08-24T06:10:21Z
urn:hdl:123456789/4929
Сборник тезисов к научно-практической конференции: "Угольная теплоэнергетика в Казахстане: Проблемы, Решения и Перспективы развития"
Редакторы: Сулейменов, К.А.
Нургалиева, М.М.
Туматай, Д.
ГТУ
окружающая среда
метод галотер
ТЭЦ
золошлаковые отходы
угольная теплоэнергетика
ТЭС
Research Subject Categories::NATURAL SCIENCES::Earth sciences
В сборнике тезисов Научно-практической конференции «Угольная энергетика в
Казахстане: проблемы, решения и перспективы развития», состоявшейся в NURIS,
Назарбаев Университет, 27-28 февраля 2020 года, приведены результаты НИОКР в
области твердотопливной энергетики, включая исследования по сжиганию и газификации
угля с использованием различных технологий их переработки.
В работах приводятся результаты анализа текущего положения в угольной
электроэнергетике Казахстана, выявлены проблемы, связанные с необходимостью
обеспечения эффективного использования угля на ТЭС и проблемы, связанные с
ужесточающими требованиями к ТЭС с пылеугольным сжиганием твердого топлива в
плане обязательного снижения вредных выбросов в атмосферу: летучей золы, оксидов
серы и азота. Показана перспективность обогащения высокозольного Экибастузского угля
со сжиганием полученного концентрата на действующих ТЭС с традиционной
технологией пылеугольного сжигания, а образующиеся высокозольные отходы
обогащения в котлах с топками циркулирующего кипящего слоя (ЦКС). Приведены
результаты сжигания таких отходов, зольностью до 79%, на стендовых установках ЦКС.
Представлены результаты пуско-наладочных работ и начальной эксплуатации
энергоблока мощностью 330 МВТэл с котлом ЦКС на Новочеркасской ГРЭС в России.
Рассмотрены мировые тенденции развития угольной энергетики, и, в частности,
перспективы развития технологии сжигания твердых топлив в ЦКС. Приведен опыт
реконструкции котлоагрегатов угольных ТЭС Украины и возможные пути использования
этого опыта на электростанциях Казахстана.
Приведены результаты экспериментальных и расчетных исследований процессов
пиролиза, газификации и сжигания различных твердых топлив, включая биомассу на
различных экспериментальных установках, в том числе, и на установках циркулирующего
кипящего слоя, а также промышленных котлах. Приведены предложения по решению
некоторых общих проблем ТЭС Казахстана.
2020-08-24T06:10:21Z
2020-08-24T06:10:21Z
2020
Conference Paper
http://nur.nu.edu.kz/handle/123456789/4929
ru
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
ЧУ Nazarbayev University Research and Innovation System; АО Самрук-Энерго
oai:nur.nu.edu.kz:123456789/49432020-08-25T21:00:38Zcom_123456789_2466com_123456789_127col_123456789_4928
2020-08-25T05:22:46Z
urn:hdl:123456789/4943
Технология сжигания углей со сниженным воздействием на окружающую среду
Алияров, Б.К.
Мергалимова, А.К.
сжигание угля
экология
окружающая среда
выбросы летучей золы
Research Subject Categories::NATURAL SCIENCES::Earth sciences
Research Subject Categories::TECHNOLOGY
В последние годы за углем закрепилось название экологически недружелюбного
топлива [1]. На самом деле следует больше говорить о применяемой технологии сжигания
угля, приводящей к таким показателям. В наиболее общем случае неудачной
организацией процесса сжигания можно сделать любое топливо экологически менее
дружелюбным к окружащей среде.
В 50-е годы прошлого столетия, приход угля в сельскую местность был, по
существу революционнной технологией – население было избавлено от необходимости
заготавливания дров на весь отопительный период и от практически постоянного
закладывания дров в печки. Этот шаг - переход на сжигание угля в те годы, возможно
был более желательным и востребованным, даже относительно перехода на газовое
отопление в последние годы.Появление угля «спасло» скудный лес в большинстве
регионов Казахстана.
В последующем развитие тепловой энергетики происходило на основе слоевого
сжигания углей в топках котлов, при котором воздействие энергетических объектов на
окружающую среду было относительно незначительным (выбросы летучей золы и
окислов азота и серы. Более того при пробных экспериментах со сжиганием угля в слое с
заданной толщиной слоя было установлено, что уровень образования окислов азота
оказался близким к уровню, который традиционно наблюдается при сжигании природного
газа.
Однако стремительный рост единичной мощности котельных агрегатов потребовал
перехода на пылевидное сжигание углей, которое оказалось достоточно универсально по
требованиям к качеству сжигаемого угля.
2020-08-25T05:22:46Z
2020-08-25T05:22:46Z
2020
Conference Paper
http://nur.nu.edu.kz/handle/123456789/4943
ru
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
ЧУ Nazarbayev University Research and Innovation System; АО Самрук-Энерго
oai:nur.nu.edu.kz:123456789/49442020-08-25T21:00:17Zcom_123456789_2466com_123456789_127col_123456789_4928
2020-08-25T05:22:48Z
urn:hdl:123456789/4944
Результаты исследований термоокислительного пиролиза длиннопламенного угля в циркулирующем кипящем слое
Сулейменов, К.А.
Дюсеханов, Т.К.
термоокислительный перолиз
длиннопламенный уголь
циркулирующий кипящий слой
Research Subject Categories::TECHNOLOGY
В настоящее время полукокс в основном получают с использованием слоевой
технологии, обладающей рядом недостатков, таких как: образование фенольных
соединений; высокая влажность получаемого полукокса (18-22%); неравномерность
термообработки угля – встречается полукокс с содержанием летучих выше 5%, что
нежелательно; необходимость использования фракционированного угля, например, 20-80
мм и отсев мелкодисперсного угля 0-20 мм, имеющего, существенно меньшую стоимость
и незначительный по объему рынок, сбыта.
Развитие новых технологий производства металлов потребовало применения в
качестве восстановителей мелкодисперсного полукокса размером 0-10 мм. В связи с этим
использование отсевов фракцией 0-20 мм может существенно снизить стоимость
производимого кокса. Поэтому разработка новой технологии получения относительно
дешевого мелкодисперсного полукокса из отсевов угля и решение ряда недостатков,
присущих слоевой технологии, является актуальным.
2020-08-25T05:22:48Z
2020-08-25T05:22:48Z
2020
Conference Paper
http://nur.nu.edu.kz/handle/123456789/4944
ru
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
ЧУ Nazarbayev University Research and Innovation System; АО Самрук-Энерго
oai:nur.nu.edu.kz:123456789/49452020-08-25T21:00:35Zcom_123456789_2466com_123456789_127col_123456789_4928
2020-08-25T05:22:51Z
urn:hdl:123456789/4945
Стабилизация и микрофакельное горение за удобообтекаемыми телами камеры сгорания ГТУ
Катранова, Г.С.
стабилизация горения
микрофакельное горение
ANSYS Fluent
рециркуляционная зона
Research Subject Categories::TECHNOLOGY
Обеспечение стабильного горения при различных избытках воздуха является одной
из важных проблем камер сгорания газотурбинных установок. Стабилизация пламени
обеспечивается различными способами: к ним относятся закрутка топлива в горелочном
устройстве, создание рециркуляционной зоны за плохообтекаемыми телами и комбинация
двух способов. Особый интерес представляет изучение стабилизации при
микрофакельном горении топлива.
Принцип работы микрофакельных устройств заключается в распределении факелов
по сечению и объему на более мелкие. Такой принцип обеспечивает высокую степень
сжигания топлива, хорошую стабилизацию при тех же средних температурах в зоне
горения жаровой трубы. Устройства на базе хорошообтекамых (удобообтекаемых) тел
имеют высокий потенциал в виду малых гидравлических сопротивлений [1].
В статье [2] рассматривалось влияние коэффициента избытка топлива φ (избытка
воздуха α) на концентрацию оксидов азота и недожога топлива при использовании
турбинных профилей с накладками. Исследование показало, что турбинные профили
являются хорошими стабилизаторами с достаточно высокими показателями горения, в
первую очередь низким недожогом топлива. Также было показано, что профили имеют
достаточно широкий диапазон стабилизации при φ=0,2÷2,3(α=5÷0,43).
2020-08-25T05:22:51Z
2020-08-25T05:22:51Z
2020
Conference Paper
http://nur.nu.edu.kz/handle/123456789/4945
ru
http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Attribution-NonCommercial-ShareAlike 3.0 United States
ЧУ Nazarbayev University Research and Innovation System; АО Самрук-Энерго
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