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Subgrade-reinforcement techniques for the dangerously deforming sections of railway lines in the north of the Russian Far East

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Research in Cold and Arid Regions 2017年第3期9卷 197-204页

作者： alexey Piotrovich Svetlana Zhdanova Far Eastern State Transport University

This paper lists difficult railway construction conditions that are typical for the northern areas of the Russian Far ***-bound issues of railway and highway construction and operation are *** of the authors'developme... 详细信息

关键词： permafrost subgrade reinforcement techniques

Optical spectra of plasmon-exciton core-shell nanoparticles:an anisotropic classical model eliminates discrepancies in experiments

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Chinese Optics Letters 2024年第9期22卷 142-147页

作者： alexey D.Kondorskiy P.N.Lebedev Physical Institute of the Russian Academy of Sciences Leninskiy prosp.53119991 MoscowRussia

The optical properties of hybrid core-shell nanostructures composed of a metallic core and an organic shell of molecular J-aggregates are determined by the electromagnetic coupling between plasmons localized at the surface of the metallic core and Frenkel excitons in the *** cases of strong and ultra-strong plasmon-exciton coupling,the use of the traditional isotropic classical oscillator model to describe the J-aggregate permittivity may lead to drastic discrepancies between theoretical predictions and the available experimental spectra of hybrid *** show that these discrepancies are not caused by limitations of the classical oscillator model itself,but by considering the organic shell as an optically isotropic *** assuming a tangential orientation of the classical oscillators of the molecular J-aggregates in a shell,we obtain excellent agreement with the experimental extinction spectra of TDBC-coated gold nanorods,which cannot be treated with the conventional isotropic shell *** results extend the understanding of the physical effects in the optics of metal-organic nanoparticles and suggest an approach for the theoretical description of such hybrid systems.

关键词： nanomaterials plasmonics polaritons organic materials optical properties anisotropic optical materials scattering particles

采用丝网印刷法基于Bi_(2)Te_(2.8)Se_(0.2)和Bi_(0.5)Sb_(1.5)Те_(3)悬浮液制备柔性热电发电机

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Journal of Central South University 2023年第9期30卷 2906-2918页

作者： VOLOSHCHUK Irina BABICH alexey PEREVERZEVA Svetlana TEREKHOV Dmitry SHERCHENKOV alexey National Research University of Electronic Technology Bld.1Shokin SquareZelenogradMoscowRussia

本研究开发了利用磷酸锌水泥和碱性硅酸钠水溶液作为黏合剂的丝网印刷形成n型和p型热元件腿的技术,研究了厚膜的热电性能。以碱性硅酸钠水溶液为黏合剂,利用基于Bi_(2)Te_(3)-Sb_(2)Te_(3)(p型)和Bi_(2)Te_(3)-Bi_(2)Se_(3)(n型)的悬浮... 详细信息

本研究开发了利用磷酸锌水泥和碱性硅酸钠水溶液作为黏合剂的丝网印刷形成n型和p型热元件腿的技术,研究了厚膜的热电性能。以碱性硅酸钠水溶液为黏合剂,利用基于Bi_(2)Te_(3)-Sb_(2)Te_(3)(p型)和Bi_(2)Te_(3)-Bi_(2)Se_(3)(n型)的悬浮液的丝网印刷结果,制备了柔性热电发电机(TEG)的原型。开发的原型包括6对由铜线连接的n型和p型腿,和一个硅胶基质被用作柔性底座。对样机的研究表明,在室温(298 K)下,柔性厚膜TEG在温差?T=2.5 K和10.0 K下的输出电压分别为0.8 mV和14.8 mV。

关键词：热电装置柔性热电发电机能量收集热电材料丝网印刷热电性能

Recent strategies to improve moisture stability in metal halide perovskites materials and devices

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Journal of Energy Chemistry 2022年第2期31卷 219-235页

作者： Chenxiao Zhou alexey B.Tarasov Eugene A.Goodilin Pengwan Chen Hao Wang Qi Chen School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Faculty of Materials Science Lomonosov Moscow State UniversityLenin Hills119991 MoscowRussia Department of Chemistry Lomonosov Moscow State UniversityLenin Hills119991 MoscowRussia State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

At present,the stability of the new generation of solar cells based on hybrid perovskites is the bottleneck for their practical *** effects,high temperature,ultraviolet light,humidity and other known or still unknown factors might cause reduction of effectiveness or even irreversible loss of materials properties due to decomposition of functional layers within perovskite solar cells(PSCs).These factors alone have a serious impact on each component of the device,while their combinations lead to much more complicated effects and *** review focuses on the stability of PSCs and the degradation of the device in a humid *** assess the instability factors and deep-seated principles of evolution of the device structure in a humidity environment with the emphasis on the influence on their *** related solutions are reviewed from the perspective of the encapsulation,perovskite active layer,carrier transport layer and *** with the latest research,we believe that the waterproof strategy of PSCs requires either tight encapsulation or thorough modifications in the device ***,it is important to develop feasible strategies to improve the overall device stability over humid according to the target characteristics of various devices.

关键词： Perovskite solar cells Water Stability Composition Encapsulation

Dimethylammonium iodide stabilized bismuth halide perovskite photocatalyst for hydrogen evolution

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Nano Research 2021年第4期14卷 1116-1125页

作者： He Zhao Kalyani Chordiya Petri Leukkunen alexey Popov Mousumi Upadhyay Kahaly Krisztian Kordas Satu Ojala Environmental and Chemical Engineering Research Unit University of OuluP.O.Box 4300FI-90014 OuluFinland ELI-ALPS ELI-HU Non-Profit Ltd.Dugonicster 136720 SzegedHungary Institute of Physics University of Szegedf D6m ter 9H-6720 Szeged Hungary Nano and Molecular Systems Research Unit University of OuluP.O.Box 3000FI-90014 OuluFinland Optoelectronics and Measurement Techniques Unit University of OuluFI-90570 OuluFinland Microelectronics Research Unit University of OuluP.O.Box 4500FI-90014 OuluFinland VTT Technical Research Centre of Finland FI-90590 OuluFinland

Metal halide perovskites have emerged as novel and promising photocatalysts for hydrogen ***,their stability in water is a vital and urgent research *** this paper a novel approach to stabilize a bismuth halide perovskite[(CH_(3))_(2)NH_(2)]_(3)[Bil_(6)](DA_(3)Bil_(6))in water using dimethylammonium iodide(DAI)without the assistance of acids or coatings is *** DA3Bil6 powder exhibits good stability in DAI solutions for at least two *** concentration of DAI is found as a critical parameter,where the I^(-)ions play the key role in the *** stability of DA3Bil6 in water is realized via a surface dissolution-recrystallization *** DA3Bil6 demonstrates constant photocatalytic properties for visible light-induced photo-oxidation of I^(-)ions and with PtCI4 as a co-catalyst(Pt-DA_(3)Bil_(6)),photocatalytic H2 evolution with a rate of 5.7μmol·h^(-1)from HI in DAI solution,obtaining an apparent quantum efficiency of 0.83%at 535 *** study provides new insights on the stabilization of metal halide perovskites for photocatalysis in aqueous solution.

关键词： bismuth halide perovskite dimethylammonium iodide photocatalysis hydrogen evolution

Photocurrent in the Polyfluorene Copolymer/PTCDI Heterojunction Enhanced by Reabsorption of Fluorescence Emission

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Chinese Journal of Polymer Science 2024年第12期42卷 1941-1947,I0009页

作者： Dmitriy A.Lypenko alexey E.Aleksandrov Artem V.Dmitriev Anton A.Yakimanskiy Ilya E.Kolesnikov Tatiana G.Chulkova Alexander V.Yakimansky alexey R.Tameev Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences 31/bld.4 Leninskiy ProspectMoscow119071Russia Institute of Macromolecular Compounds of the Russian Academy of Sciences 31 Bolshoi pr.VOSaint Petersburg199004Russia Saint Petersburg State University 7/9 Universitetskaya nab.Saint Petersburg199034Russia

Copolyfluorenes are of great interest due to their ability to form thin films with tunable optical and electrical *** this paper,copolymers of polyfluorene with electron withdrawing dicyanostilbene and dicyanophenanthrene moieties were synthesized;their thin films were characterized by electron spectroscopy,cyclic voltammetry,electrical,and photoelectrical *** mobility of charge carriers in the copolymers was measured for the first time,with the acceptor components providing balanced electron and hole mobilities of the order of 10^(-6) cm^(2)·V^(-1)·s^(-1).Photodetectors based on the copolymer/PTCDI heterojunction exhibited the photoresponse band extended into the green region due to the absorption of PTCDI and an increased photocurrent in the UV-blue absorption band of the copolymer,which is related to the absorption of photoluminescent emission of the copolymers in *** presented approach to improving the performance of a polymer-based photodetector is promising in organic optoelectronics.

关键词： Polyfluorene copolymer Perylenedicarboximide derivative Charge carrier mobility Fluorescence Photoconductivity

Applications of two electric arc plasma torches for the beneficiation of natural quartz

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 267-273页

作者： Yuri-Mikhailovich Grishin Long Miao Lev-Alekseevich Borisov Nikolay-Mikhailovich Serykh alexey-Yurievich Kulagin Department of Thermal physics Bauman Moscow State Technical University Federal State Unitary Enterprise Tsentrkvarts

Experimental beneficiation processes of quartz concentrate in arc plasma torches of two different types and electric powers were studied. An emission scanning electron microscope and a universal laser analyzer were used to investigate the structures as well as the size distributions of grains and microparticles. Inductively coupled plasma–mass spectrometry was used to determine the chemical compositions of nonstructural solid-phase mineral impurities in quartz concentrate. Results related to the modified grains' structure and size distribution, the compositions of impurities, and the gas–liquid inclusions in the quartz concentrate were investigated. The total impurities concentrations in the processed grains were found to satisfy the IOTA-STD standard(industry standard for grading high quality fused quartz products). The optimal condition(i.e., the optimal specific plasma enthalpy) for the production of high-purity quartz in arc plasma torches was found to depend on the geological-genetic type and the structural and textural features(i.e., chemical composition and gas–liquid inclusions) of the quartz concentrate.

关键词： low-temperature plasma beneficiation high purity quartz arc plasma torch IOTA-STD standard

Surface and Subsurface Defects Studies of Dental Alloys Exposed to Sandblasting

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Acta Metallurgica Sinica(English Letters) 2019年第10期32卷 1181-1194页

作者： Krzysztof Siemek Miroslaw Kulik Marat Eseev Miroslaw Wrobel Andrey Kobets Oleg Orlov alexey Sidorin Joint Institute for Nuclear Research Joliot-Curie 6 Dubna Moscow Region Russian Federation 141980 Institute of Nuclear Physics PAS E. Radzikowskiego 152 31-342 Krakow Poland Institute of Physics Maria Curie-Sklodowska University pl. M. Curie-Skiodowskiej 1 20-031 Lublin Poland Northern Arctic Federal University Severnaya Dvina Emb. 17 Arkhangelsk Russian Federation 163002 AGH University of Science and Technology 30 Mickiewicza Ave 90-059 Krakow Poland Institute of Electrophysics and Radiation Technologies NAS of Ukraine Chernyshevsky St. 2& Kharkiv 61002 Ukraine

The defects created in commercial dental alloys during blasting with alumina particles propelled in compressed air under pressure 0.1 and 0.4 MPa have been studied using positron annihilation spectroscopy, scanning electron microscopy and X-ray diffraction. It was observed that higher pressure causes the increase in roughness and damaged zone range. The type of defects was determined as vacancies on dislocations. The defect concentration decreases with the depth and depends on alloys' type and applied pressure. The Rutherford backscattering spectroscopy and variable energy positron beam studies indicate shallow alumina deposition in material and show that small pressure of 0.1 MPa is not enough to remove metal surface oxides completely in 60 s in all studied dental alloys.

关键词： Sandblasting Positron annihilation technique Dental alloys Defects analysis Oxides

Evolution of parthenogenetic reproduction in Caucasian rock lizards:A review

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Current Zoology 2023年第2期69卷 128-135页

作者： Marine Arakelyan Victor Spangenberg Varos Petrosyan alexey Ryskov Oksana Kolomiets Eduard Galoyan Department of Zoology Yerevan State UniversityYerevanArmenia Vavilov Institute of General Genetics MoscowRussia Severtsov Institute of Ecology and Evolution RAS MoscowRussia Institute of Gene Biology RASMoscowRussia Zoological Museum of Moscow State University MoscowRussia

Despite numerous works devoted to hybrid origin of parthenogenesis in reptiles,the causes of hybridization between different species,resulting in the origin of parthenogenetic forms,remain *** studies demonstrate that sexual species considered parental to parthenogenetic rock lizards(Darevskia spp.)avoid interspecific mating in the secondary overlap areas.A specific combination of environmental factors during last glaciation period was critical for ectotherms,which led to a change in their distribution and sex *** population structure(e.g.,male bias)and limited available distributional range favored the deviation of reproductive behavior when species switched to interspecific *** date,at least 7 diploid parthenogenetic species of rock lizards(Darevskia,Lacertidae)originated through interspecific hybridization in the *** cytogenetic specifics of meiosis,in particular the weak checkpoints of prophase l,may have allowed the formation of hybrid karyotypes in rock *** and polyploidization are 2 important evolutionary forces in the genus *** present,throughout backcrossing between parthenogenetic and parental species,the triploid and tetraploid hybrid individuals appear annually,but no triploid species found among Darevskia *** current stage of *** speciation by hybridization with the long-term stage of diploid parthenogenetic species,non-distorted meiosis,together with the high ecological plasticity of Caucasian rock lizards provide us with a new model for considering the pathways and persistence of the evolution of parthenogenesis in vertebrates.

关键词： Caucasus glacial period hybridization reptiles reticulate evolution unisexual