• PPI_SNCP_AFM_COMPARSION 

  Nazir, Faisal (School of Sciences and Humanities, 2023)
• MECHANO-CHEMICAL PROPERTIES OF ELECTRON BEAM IRRADIATED POLYETHERETHERKETONE 

  Almas, Nurlan; Kurbanova, Bayan; Zhakiyev, Nurkhat; Rakhadilov, Baurzhan; Sagdoldina, Zhuldyz; Andybayeva, Gaukhar; Serik, Nurzhan; Alsar, Zhanna; Utegulov, Zhandos; Insepov, Zinetula (Polymers, 2022)

  In this study, the mechano-chemical properties of aromatic polymer polyetheretherketone (PEEK) samples, irradiated by high energy electrons at 200 and 400 kGy doses, were investigated by Nanoindentation, Brillouin light ...
• SIZE-DEPENDENT PHONON-ASSISTED ANTI-STOKES PHOTOLUMINESCENCE IN NANOCRYSTALS OF ORGANOMETAL PEROVSKITES 

  Sekerbayev, Kairolla; Taurbayev, Yerzhan; Mussabek, Gauhar; Baktygerey, Saule; Pokryshkin, Nikolay S.; Yakunin, Valery G.; Utegulov, Zhandos; Timoshenko, Victor Yu. (Nanomaterials, 2022)

  Anti-Stokes photoluminescence (ASPL), which is an up-conversion phonon-assisted process of the radiative recombination of photoexcited charge carriers, was investigated in methylammonium lead bromide (MALB) perovskite ...
• IMPROVING PHOTOELECTROCHEMICAL ACTIVITY OF MAGNETRON-SPUTTERED DOUBLE-LAYER TUNGSTEN TRIOXIDE PHOTOANODES BY IRRADIATION WITH INTENSE PULSED ION BEAMS 

  Abduvalov, Alshyn; Kaikanov, Marat; Atabaev, Timur Sh.; Tikhonov, Alexander (Nanomaterials, 2022)

  The photoelectrochemical (PEC) activity of metal oxide photoelectrodes for water-splitting applications can be boosted in several different ways. In this study, we showed that PEC activity can be significantly improved ...
• ELECTRICAL AND STRUCTURAL CHARACTERIZATION OF FEW-LAYER GRAPHENE SHEETS ON QUARTZ 

  Aimaganbetov, Kazybek; Almas, Nurlan; Kurbanova, Bayan; Muratov, Dauren; Serikkanov, Abay; Insepov, Zinetula; Tokmoldin, Nurlan (Materials, 2022)

  Despite the impressive performance and incredible promise for a variety of applications, the wide-scale commercialization of graphene is still behind its full potential. One of the main challenges is related to preserving ...
• NOVEL ORGANIC TANDEM SOLAR CELLS 

  Ernest, Adiyiah Asare (School of Sciences and Humanities, 2023)

  Organic tandem solar cells have attracted significant attention as a promising technology for next-generation photovoltaics due to their potential to achieve high power conversion efficiencies. In this study, we present a ...
• ULTRA-SHARP ANGULAR FILTERING OF FAR-FIELD SIGNALS WITH GRADED-INDEX MULTILAYERS 

  Shukurov, Sanat (School of Sciences and Humanities, 2023)

  Dielectric multilayers with graded index treat the propagating waves impinging at different angles very differently, due to total internal reflection. Such an ultra-sharp change in the response can be exploited for ...
• DISSIPATIVE COLLAPSE OF THE SPHERICAL STELLAR OBJECT 

  Aryngazin, Ansar (School of Sciences and Humanities, 2023)

  In this research we investigate the shear-free, non-viscous perfect fluid model describing stellar object that emits radiation that leads to dissipation. We study matching of the interior metric with the exterior outgoing ...
• VORTEX RING RECONNECTIONS IN PARAXIAL LASER BEAMS 

  Kulchukova, Zhamila (School of Sciences and Humanities, 2023)

  In recent years, optical vortex knots have been the subject of active research. The knots appear in various areas of physics and understanding the mechanism that is responsible for their formation is a problem that extends ...
• GRAVITATIONAL COLLAPSE MODEL WITH DISSIPATION 

  Abilmazhinova, Madina (School of Sciences and Humanities, 2023)

  Radiating spherically-symmetric collapsing model is studied. Exterior Vaidya spacetime is matched with the interior of a perfect fluid with a heat flow. Junction conditions and field equations are derived, revealing that ...
• STAR CLUSTER MEMBERSHIP IDENTIFICATION BY SUPERVISED MACHINE LEARNING MODELS APPLIED TO N-BODY SIMULATIONS 

  Bissekenov, Abylay (School of Sciences and Humanities, 2023)

  This thesis investigates possible ways to apply supervised machine learning algorithms on N-body simulations. Because of the limitations of observational data, there is a motivation to research star clusters by the N-body ...
• A REVIEW ON THE MATERIALS SCIENCE AND DEVICE PHYSICS OF SEMITRANSPARENT ORGANIC PHOTOVOLTAICS 

  Schopp, Nora; Brus, Viktor V. (Energies, 2022)

  In this review, the current state of materials science and the device physics of semitransparent organic solar cells is summarized. Relevant synthetic strategies to narrow the band gap of organic semiconducting molecules ...
• FABRICATION OF FLEXIBLE QUASI-INTERDIGITATED BACK-CONTACT PEROVSKITE SOLAR CELLS 

  Parkhomenko, Hryhorii P.; Shalenov, Erik O.; Umatova, Zarina; Dzhumagulova, Karlygash N.; Jumabekov, Askhat N. (Energies, 2022)

  Perovskites are a promising class of semiconductor materials, which are being studied intensively for their applications in emerging new flexible optoelectronic devices. In this paper, device manufacturing and characterization ...
• CONNECTION BETWEEN REGULAR BLACK HOLES IN NONLINEAR ELECTRODYNAMICS AND SEMICLASSICAL DUST COLLAPSE 

  Malafarina, Daniele; Toshmatov, Bobir (PHYSICAL REVIEW D, 2022)

  There exists a correspondence between black holes in nonlinear electrodynamics (NLED) and gravitational collapse of homogeneous dust with semiclassical corrections in the strong curvature regime that to our knowledge has ...
• UPON THE HORIZON'S VERGE: THERMAL PARTICLE CREATION BETWEEN AND APPROACHING HORIZONS 

  Fernández-Silvestre, Diego; Good, Michael R R; Linder, Eric V (Classical and Quantum Gravity, 2022)

  Quantum particle creation from spacetime horizons, or accelerating boundaries in the dynamical Casimir effect, can have an equilibrium, or thermal, distribution. Using an accelerating boundary in flat spacetime (moving ...
• MÖBIUS MIRRORS 

  Good, Michael R R; Linder, Eric V (Classical and Quantum Gravity, 2022)

  An accelerating boundary (mirror) acts as a horizon and black hole analog, radiating energy with some particle spectrum. We demonstrate that a Möbius transformation on the null coordinate advanced time mirror trajectory ...
• DETERMINATION OF THE CHARGE CARRIER DENSITY IN ORGANIC SOLAR CELLS: A TUTORIAL 

  Vollbrecht, Joachim; Tokmoldin, Nurlan; Sun, Bowen; Brus, Viktor V.; Shoaee, Safa; Neher, Dieter (Journal of Applied Physics, 2022)

  The increase in the performance of organic solar cells observed over the past few years has reinvigorated the search for a deeper understanding of the loss and extraction processes in this class of device. A detailed ...
• STUDY OF THE ELECTRON–ATOM COLLISIONS IN DENSE SEMICLASSICAL PLASMA OF NOBLE GASES 

  Dzhumagulova, Karlygash N.; Shalenov, Erik O.; Tashkenbayev, Yerkhan A.; Ramazanov, Tlekkabyl S. (Journal of Plasma Physics, 2022)

  We present the effective optical potential of the interaction of an electron with an atom in dense semiclassical plasma of noble gases. This potential takes into account the collective screening effect and the quantum ...
• MaLeFiSenta: Machine Learning for FilamentS Identification and Orientation in the ISM 

  Alina, Dana; Shomanov, Adai; Baimukhametova, Sarah (IEEE Access, 2022-07-22)

  Filament identification became a pivotal step in tackling fundamental problems in various fields of Astronomy. Nevertheless, existing filament identification algorithms are critically user-dependent and require individual ...
• EFFECTS OF GRAVITATIONAL LENSING ON NEUTRINO OSCILLATION IN Γ-SPACETIME 

  Chakrabarty, Hrishikesh; Borah, Debasish; Abdujabbarov, Ahmadjon; Malafarina, Daniele; Ahmedov, Bobomurat (The European Physical Journal C, 2022)

  We study the effects of gravitational lensing on neutrino oscillations in the γ-spacetime which describes a static, axially-symmetric and asymptotically flat solution of the Einstein’s field equations in vacuum. Using the ...

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