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Test particles and quasiperiodic oscillations around Kiselev black hole with cloud of str.ngs

Chinese Physics C 2024年第5期48卷 293-308页

作者： Javlon Rayimbaev Uktambek Eshimbetov Bushra Majeed Ahmadjon Abdujabbarov Alisher Abduvokhidov Bakhrom Abdulazizov Akram Xalmirzayev School of Mathematics and Natural Sciences New Uzbekistan UniversityMovarounnahr Str.1Tashkent 100000Uzbekistan School of Engineering Central Asian UniversityTashkent 111221Uzbekistan university of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan National university of Uzbekistan Tashkent 100174Uzbekistan Ulugh Beg Astr.nomical Institute Astronomy Str.33Tashkent 100052Uzbekistan Tashkent state Technical university Tashkent 100095Uzbekistan College of Electrical and Mechanical Engineering(CEME) National University of Sciences and TechnologyRawalpindiPakistan Andijan state university Universitet Str.129Andijan 170100Uzbekistan Namangan state university Boburshoh Str.161Namangan 160107Uzbekistan

In the present study,we investigate the dynamics of test particles around a Schwarzschild black hole surrounded by quintessence and immersed in a scalar str.ng cloud *** start our study by defining the possible values of the quintessence and cloud of str.ng parameters corresponding to the existence of the black hole horizon for fixed values of the parameters of the equation of state for dark *** also study the effects of the effective potential on the circular motion,energy,and angular momentum of the test particles together with the innermost stable circular orbits(ISCOs).We investigate the fundamental frequencies in the particle oscillations along stable circular *** relate the stability of the orbits to the Lyapunov exponent,and the chaotic behavior is studied ***,we apply the fundamental frequencies to describe quasiperiodic oscillations(QPOs)and find that,in the presence of both fields,low-frequency twin-peak QPOs are not *** addition,we obtain the constr.int values for the str.ng cloud parameter and mass of the black hole candidates located in the center of the microquasars GRO J1655-40 and GRS 1915+105 as well as the Milky Way galaxy.

关键词： quintessential field black holes str.ng cloud quasiperiodic oscillations

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Development and testing of a high-power S-band klystr.n at BINP SB RAS

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Nuclear Science and Techniques 2024年第7期35卷 58-67页

作者： A.Levichev A.Barnyakov S.Samoylov D.Nikiforov V.Ivanov M.Arsentyeva D.Chekmenev O.Pavlov I.Pivovarov Budker Institute of Nuclear Physics Lavrentyeva Av.11NovosibirskRussia630090 Novosibirsk state university Pirogova Str.2NovosibirskRussia630090

This paper details the development and testing of the first working prototype of the S-band high-power klystr.n,accomplished at the Budker Institute of Nuclear Physics,Siberian Branch,Russian Academy of Sciences(BINP SB RAS).Upon testing,the klystr.n demonstr.ted the following parameters:an operating frequency of 2856 MHz and a peak power output of 50 *** paper presents the klystr.n's design,its constituent units,and pertinent processing procedures,along with discussions on the measurement of its parameters.

关键词： Klystr.n Linear accelerator Electron beam

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Elucidating elusive quaternary selenide EuCeCuSe3:Synthesis,crystal str.cture,properties and theoretical studies

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Journal of Rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim V.Grigoriev Anna V.Ruseikina Maxim S.Molokeev Vladimir A.Chernyshev Aleksandr S.Aleksandrovsky Alexander S.Krylov Svetlana N.Krylova Nikolai P.Shestakov Dmitriy A.Velikanov Alexander A.Garmonov Alexey V.Matigorov Evgeny A.Ostapchuk Thomas Schleid Damir A.Safin Laboratory of Theory and Optimization of Chemical and Technological Processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of Physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation Department of Physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural Sciences and Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation Department of Photonics and Laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of Physics and Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistr. University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany Scientific and Educational and Innovation Center for Chemical and Pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation university of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenide EuCeCuSe3,the fabrication of which has been a challenge until this *** str.cture of the reported selenide was elucidated from the powder X-ray diffraction data,which revealed the formation of EuCeCuSe3with excellent yield(96.7%)accompanied with a minor fraction of CeSe2(3.3%),and was best solved in orthorhombic space group Pnma with the BaLaCuS3str.ctural ***,the crystal str.cture of the title compound completes the row of the heterometallic quaternary selenides EuRECuSe3(RE=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y),of which the cerium-based derivative exclusively belongs to the BaLaCuS3str.ctural *** distortion of the CuSe4polyhedron was compared for the whole series of EuRECuSe3compounds using theτ4-descriptor for four coordinated ions,which revealed the highest degree of distortion for the Ce3+-containing selenide,followed by the La3+-based ***,the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3and *** initio calculations of the crystal str.cture,a phonon spectrum and elastic constants for the crystal of EuCeCuSe3were also *** types and wavenumbers of fundame ntal modes were determined and the involvement of ions participating in the phonon modes was *** experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated *** experimental direct band gap of EuCeCuSe3was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f(valence band)and 5d(conduction band)levels of the Eu2+*** dependence of the Young’s modulus on the direction demonstr.tes the anisotropy of the elastic properties,while the Vickers hardness for EuCeCuSe3was calculated to be 5.2 ***,the title compound is paramagnetic above 4 K.

关键词： Quaternary selenide Synthesis Crystal str.cture Ab initio calculations Magnetic measurements Spectroscopy

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Comparison of extraction abilities of deep eutectic solvents and aqueous acid solutions for extraction of rare earths and transition metals

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Journal of Rare Earths 2024年第6期42卷 1157-1164,I0006页

作者： Svetlana Drogobuzhskaya Margarita Frolova Andrey Shishov Nikita Tsvetov Tananaev Institute of Chemistr.-Subdivision of the Federal Research Centre《Kola Science Centre of the Russian Academy of Sciences》 18420926a AcademgorodokApatityRussia Murmansk state Technical university 183010Sportivnaja str.13MurmanskRussia Department of Analytical Chemistr. Institute of ChemistrySaint Petersburg State UniversitySpbSU.1990347/9 Universitetskaya embSt.Petersburg Russia

In recent years,deep eutectic solvents have attracted increasing interest as effective extractants for the separation of both organic substances and metals from various ***-based deep eutectic solvents are most often used as extractants for the extraction of *** this work,for the first time,the extraction efficiency of transition metals and rare earth elements(Y,Zr,Nb,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Hf and Ta)from mining tailings and Na,K,Ca,Mg,Cu,Fe,Mn,Pb,Ba,Ni and Sr from biodiesel samples using acidic deep eutectic solvents and saturated aqueous solutions of the same acids(malonic,malic,tartaric and citric)is *** this,deep eutectic solvents based on acids and their aqueous saturated solutions were prepared and *** prepared mixtures were analyzed by IR spectroscopy to confirm the formation of eutectic *** such as the density and viscosity of the resulting mixtures were also investigated,as this can be of key importance for the efficiency of metal *** extraction of rare earth metals from mining tailings took a long time(up to several days),while the extraction of metals from fuel took no more than 30 *** emission spectral methods were used as an analysis *** is shown that the extraction efficiency with aqueous solutions is better than that with eutectic solvents,which casts doubt on the need for deep eutectic solvents use in this area.

关键词： Deepeutectic solvent Metal separation Elemental analysis Rare earth metals Biodiesel

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Reactions induced by 30 MeV 3He beam on 9Be:cluster transfer reactions

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Chinese Physics C 2024年第1期48卷 61-70页

作者： B.A.Urazbekov T.Issatayev S.M.Lukyanov A.Azhibekov A.S.Denikin K.Mendibayev D.M.Janseitov Yu E.Penionzhkevich K.A.Kuterbekov T.K.Zholdybayev Gumiliyev Eurasian National university 2 Satpayev StrAstanaKazakhstan Institute of Nuclear Physics 1 Ibragimov StrAlmatyKazakhstan Bogolubov Laboratory of Theoretical Physics JINR20 Joliot Curie StrDubnaRussia Flerov Laboratory of Nuclear Reactions JINR20 Joliot Curie StrDubnaRussia Korkyt-ata state university 29A Aiteke-Byi StrKyzylordaKazakhstan Dubna state university 19 Universitetskaya StrDubnaRussia Al-Farabi Kazakh National university AlmatyKazakhstan

An experiment was conducted for studying the cluster str.cture of Be induced by He ions at an energy of 30 *** results of the nuclear reaction^(3)He+^(9)Be,the differential cross sections for the exit channels–elastic,inelastic,α+^(8)Be,^(6)He+^(6)Be,^(6)Li+^(6)Li,and^(7)Be+^(5)He–were *** and inelastic scattering data were treated within both the optical model and coupled channel method.A new set of optical potentials was considered for the elastic *** deformation parameter was established for the transition 3/2→5/*** transfer reactions were analyzed via the coupled reaction channel *** nuclear reactions with the exit channels^(6)He+^(6)Be,^(6)Li+^(6)Li,and^(7)Be+^(5)He were complemented by two-step transfer *** contribution of each reaction mechanism were shown and compared with the findings of other authors.

关键词： cluster transfer reaction mechanisms coupled equations

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Insight into vertical piezoelectric characteristics regulated thermal transport in van der Waals two-dimensional materials

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Rare Metals 2024年第2期43卷 770-779页

作者： Dong-Hai Wei E Zhou Jin-Yuan Xu Hui-Min Wang Chen Shen Hong-Bin Zhang Zhen-Zhen Qin Guang-Zhao Qin state Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China Hunan Key Laboratory for Micro-Nano Energy Materials and Device and School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105China Institute of Materials Science Technical University of DarmstadtAlarich-Weiss-Str.264287DarmstadtGermany School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China

The urgent demand of extreme(ultra-high/low)thermal conductivity materials is triggered by the high-power device,where exploring the theories and mechanisms of regulating thermal transport properties plays a key ***,we elaborately investigate the effect of vertical(out-of-plane)piezoelectric characteristics on thermal transport,which is historically *** different stacking-order(AA and AB)bilayer boron nitride(Bi-BN)in two-dimensional(2D)materials are selected as study *** performing state-of-the-art first-principles calculations,it is found that the polarization charge along the out-of-plane orientation ascends significantly with the increasing piezoelectric response in AB stacked Bi-BN(Bi-BN-AB)followed by the enhanced interlayer B–N atomic ***,the amplitude of phonon anharmonicity in Bi-BN-AB increases larger than that in the AA stacked Bi-BN(Bi-BN-AA),resulting in the dramatic weakening of the thermal conductivity by 20.34%under 18%*** research reveals the significant role of the vertical(out-of-plane)piezoelectric characteristic in regulating thermal transport and provides new insight into accurately exploring the thermal transport performance of 2D van der Waals materials.

关键词： Thermal conductivity Piezoelectric effect 2D materials Bilayer BN str.in engineering

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Catalytic co-combustion of biomass and brown coal in a fluidized bed:Economic and environmental benefits

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Journal of Environmental Sciences 2024年第6期140卷 24-36页

作者： Yury V.Dubinin Nikolay A.Yazykov Petr M.Yeletsky Roman B.Tabakaev Aleksandra I.Belyanovskaya Vadim A.Yakovlev Federal Research Center Boreskov Institute of Catalysis SB RAS Lavrentiev Ave.5Novosibirsk630090Russia university of Tyumen Volodarskogo str.6Tyumen625003Russia

The work is devoted to the study of combustion of brown coal,pine sawdust,and their mixtures in a fluidized bed of catalyst at 600-750℃.It is shown that an increase in the content of sawdust in a mixture with brown coal leads to an increase in the burnout degree of solid fuel from 94.4%to 99.9%,while the emission of greenhouse gases in the form of CO_(2)CO and NOxis reduced(CO_(2)from the biomass is not included in the balance).The high content of alkaline earth metal oxides(CaO and MgO)in the mineral part of brown coal,sawdust,and their mixtures eliminates the emission of sulfur oxides and the slagging of heat-exchange surfaces during the combustion in a fluidized bed of *** optimal temperature,when the highest burnout degree of the above fuels is achieved in the combustion is 750℃.It is also shown that the increase in temperature and the content of sawdust in the composition of the fuel mixtures has a positive effect on the economic and environmental process indicators.

关键词： Co-combustion Fluidized catalyst bed Biomass Coal Economic effect Environmental impact

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Exploring the shadow of a rotating charged ModMax black hole

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Communications in Theoretical Physics 2024年第2期76卷 89-101页

作者： Khurshid Karshiboev Farruh Atamurotov Ahmadjon Abdujabbarov Ali Övgün Anvar Reyimberganov Institute of Theoretical Physics National University of UzbekistanTashkent 100174Uzbekistan New Uzbekistan university Movarounnahr Street 1Tashkent 100000Uzbekistan Central Asian university Milliy Bog'Street 264Tashkent 111221Uzbekistan university of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Tashkent state Technical university Tashkent 100095Uzbekistan Ulugh Beg Astr.nomical Institute Astronomy Street 33Tashkent 100052Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan Physics Department Eastern Mediterranean UniversityFamagusta99628 North Cyprusvia Mersin 10Turkey Urgench state university Urgench 220100Uzbekistan

The research presented in this paper discusses the impact that the parameters of charge(Q)and screening factor(γ)have on properties of the horizon and silhouette of rotating charged Mod Max black holes which were reviewed in[***.J.C(2022)82:1155]recently,building upon previous findings in the ***,the study explores the behavior of null geodesics,which can help us better understand the apparent shape of the black hole’s silhouette,as well as the distortion parameter and approximate radii of the silhouette that are influenced by the aforementioned parameters,and there are some values of parameter Q which corresponds to data from the Event Horizon Telescope(EHT).Notably,we explore the distortion parameter and approximate radii of the silhouette,revealing that while an increase inγleads to a growth in silhouette radius(Rs),it simultaneously reduces the distortion rate(δs).Conversely,heightened Q charge results in a reduction of Rsaccompanied by an increase inδ***,the paper analyzes the effects of the black hole’s parameters on the effective potential and energy emission:the peak value of the energy emission rate experiences a decrease as the screening factor(γ)increases,while it increases with higher values of the charge parameter(Q).

关键词： black hole ModMax gravity rotating black hole black hole shadow

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Tumor cell death visualization of renal cell carcinoma under the combined effect of the Gratiola officinalis extract and cyclophosphamide using fluorescent staining methods

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Journal of Innovative Optical Health Sciences 2021年第5期4卷 46-52页

作者： Artyom Mylnikov Nikita Navolokin Dmitry Mudrak Natalya Polukonova Alla Bucharskaya Galina Maslyakova saratov state medical university named after V.I.Razumovsky 112 Bolshaya Kazachia Street Saratov 410012Russia National Research saratov state university 83 Astrakhanskaya Street Saratov 410012Russia National Research Tomsk state university 36 Lenin Avenue Tomsk 634050Russia

Objective of the study:We used fluorescence imaging methods of apoptosis and necrosis in human renal carcinoma A498 tumor cells in vitro to reveal the indicated forms of cell death under the combined effect of flavonoid-containing extract of Gratiola officinalis and cytostatic(cyclo-phosphamide).Materials and methods:The dyes were propidium iodide and acridine orange,which were used in the"alive and dead"*** test helped us to identify the total number of dead cells in the forms of necrosis and apoptosis and the number of cells in which apoptosis had started,it was characterized by the appearance of apoptotic bodies or nucleus ***:We found the most pronounced cytotoxic activity at the ratio of extract of Gratiola officinalis and cyclophosphamide concentrations of 1∶*** number of living cells decreased when exposed to the ratio of extract and cytostatic concentrations of 2∶*** the ratio of concentration of the extract relative to the cytostatic increased to 3∶1,the cytostatic activity of the extract began to appear,the total number of tumor cells *** number of cells with nucleus pyknosis and the number of cells with apoptosis signs significantly increased at a 3∶1 ratio of extract and cytostatic concentrations,which confirms the presence of pro-apoptotic activity of the studied *** trend indicates the dependence of a certain form of cell death(apoptosis,necrosis)on the ratio of extract and cytostatic doses,and it also demon-str.tes the cytostatic and cytotoxic effects of this ***:Fluorescence methods of investigation in the"alive and dead"test allowed us to visualize the forms of cell death of human kidney carcinoma A498 by combined exposure to the fiavonoid-containing extract of Gratiola officinalis and cytostatic(cyclophosphamide)24 h after *** found that the combination with a concentration ratio of the extract and cyclophosphamide of 3:1 has the greatest effectiveness due to stimulation of t

关键词： A498 cell line Gratiola officinalis extract antitumor activity cytostatic activity flavonoids fluorescent methods kidney cancer

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Neutrino oscillations in the Non-Kerr black hole with quantum phenomenon

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Chinese Physics C 2024年第7期48卷 55-66页

作者： Husan Alibekov Farruh Atamurotov Ahmadjon Abdujabbarov Vokhid Khamidov Ulugh Beg Astr.nomical Institute Astronomy St.33Tashkent 100052Uzbekistan university of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan New Uzbekistan university Movarounnahr street 1Tashkent 100000Uzbekistan Tashkent state Technical university Tashkent 100095Uzbekistan Institute of Theoretical Physics National University of UzbekistanTashkent 100174Uzbekistan Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan Tashkent university of Information Technologies named after Muhammad al Khwarizmi Amir Temur 108Tashkent 100014Uzbekistan

In this study,we have investigated the mathematical components of the Dirac equation in curved spacetime and how they can be applied to the analysis of neutrino *** specifically,we have developed a method for calculating the phase shift in flavor neutrino oscillations by utilizing a Taylor series expansion of the action that takes into account△m^(4) *** addition,we have used this method to assess how the phase difference in neutrino mass eigenstates changes according to the gravitational field described by the Johannsen spacetime.

关键词： Dirac equation neutrino flavour oscillation curved spacetime D0I:10.1088/1674-1137/ad3c2c

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