Zholdasbek, Aknur(Nazarbayev University School of Sciences and Humanities, 2024-05-03)
The modern cosmological models tell us that the early universe has gone through a phase of accelerated expansion, known as inflation, which solves the horizon and flatness problems. In this thesis, I present an inflationary ...
Asanov, Nurzhan(Nazarbayev University School of Sciences and Humanities, 2024-04-30)
The performance of organic bulk-heterojunction solar cells is closely tied to the morphology of their active layer, a disordered mixture of organic donor and acceptor materials, where photoexcitation and charge generation ...
Telman, Yerassyl(Nazarbayev University School of Sciences and Humanities, 2024-04)
Modern Astrophysics, and the study of Core-Collapse Supernovae in particular, require
an intense computational power and convenient code for different machines. A portable
versatile code IDEFIX is able to deal with these ...
Abdukhairov, Ilyar(Nazarbayev University School of Sciences and Humanities, 2024-04-21)
The absorption and oxidation of NOx gases by potassium persulfate has been
implemented to remove the NOx gases from the air by forced ventilation through wet
silica gel beads soaked with K2S2O8
/K2CO3 and (NH4)2S2O8
...
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 ...
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 ...
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 ...
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 ...
Asare, Ernest Adiyiah(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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...