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V. S. Alexandrov E. E. Donets G. I. Konnov V. V. Kosukhin V. O. Sidorova A. I. Sidorov V. S. Shvetsov G. V. Trubnikov 《Physics of Particles and Nuclei Letters》2014,11(5):656-659
A high-voltage platform that has been developed for the KRION ion source is described. The platform design concept is explained. The calculations that have been performed of the influence of the design and materials on the source magnetic field make it possible to define a range of materials suitable for manufacturing the platform. The major components of the high-voltage platform, such as a high-voltage power supplier, and decoupling insulators of the high-voltage power source, and the main and supplementary platforms, are chosen and described. It is determined that, to exclude electric breakdowns and corona discharges, one should use an electrically shielded channel with a cryocooler and power supplies for the KRION-source coupling cables. 相似文献
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Physics of the Solid State - The dependence of the exciton-light coupling on the size of a quantum well in an external electric field is theoretically analyzed. It is shown that in a sufficiently... 相似文献
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The frequency dependence of magnetic loss in ferrites at various exciting field amplitudes is studied. A model is constructed from which losses due to microeddy currents in hysteresis cyclical magnetization are estimated. Both the level and frequency dependence of losses observed in the vicinity of 100 kHz are explained within the framework of this model.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 6–10, June, 1985. 相似文献
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N. N. Agapov A. V. Alfeev V. A. Andreev V. I. Batin O. I. Brovko A. V. Butenko B. -R. V. Vasilishin V. I. Volkov A. I. Govorov E. D. Donets E. E. Donets D. E. Donets A. V. Eliseev I. B. Issinskii V. N. Karpinskii V. D. Kekelidze A. D. Kovalenko O. S. Kozlov I. N. Meshkov V. A. Mikhailov V. A. Monchinskii P. A. Rukoyatkin N. V. Semin A. O. Sidorin A. N. Sissakian V. M. Slepnev A. S. Sorin G. V. Trubnikov G. G. Khodzhibagiyan 《Physics of Particles and Nuclei Letters》2010,7(7):442-445
The Nuclotron superconducting synchrotron was constructed in 1987–1992 [1]; it is the world’s first synchrotron based on fast cycling “window frame” electromagnets with a superconducting coil. For a design field of dipole magnets of 2 T, the magnetic rigidity is 45 T m, which corresponds to the energy of heavy nuclei (for example, gold) of 4.5 GeV/nucleon. The Nuclotron accelerator complex is currently being upgraded (the Nuclotron-M project); this upgrade is considered a key part of the first stage of fulfilling the new Joint Institute for Nuclear Research (JINR) project: the Nuclotron-based Ion Collider fAcility and Multi-Purpose Detector (NICA/MPD). The most important task of this new project is the preparation of basic Nuclotron systems for its reliable operation as part of the NICA accelerator complex. Basic results of activity on the project, which started in 2007, are presented and the results of the last Nuclotron runs are analyzed. 相似文献
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Nickel(0)‐Catalyzed Enantioselective Annulations of Alkynes and Arylenoates Enabled by a Chiral NHC Ligand: Efficient Access to Cyclopentenones 下载免费PDF全文
Joachim S. E. Ahlin Dr. Pavel A. Donets Prof. Dr. Nicolai Cramer 《Angewandte Chemie (International ed. in English)》2014,53(48):13229-13233
Cyclopentenones are versatile structural motifs of natural products as well as reactive synthetic intermediates. The nickel‐catalyzed reductive [3+2] cycloaddition of α,β‐unsaturated aromatic esters and alkynes constitutes an efficient method for their synthesis. Here, nickel(0) catalysts comprising a chiral bulky C1‐symmetric N‐heterocyclic carbene ligand were shown to enable an efficient asymmetric synthesis of cyclopentenones from mesityl enoates and internal alkynes under mild conditions. The bulky NHC ligand provided the cyclopentenone products in very high enantioselectivity and led to a regioselective incorporation of unsymmetrically substituted alkynes. 相似文献
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A. V. Bogatskii G. L. Kamalov N. G. Luk'yanenko E. A. Donets 《Chemistry of Heterocyclic Compounds》1972,8(1):1-4
Methods were developed for the synthesis of 2-ethoxy-1,4-butanediol and 2-ethoxy-1,4-pentanediol. The latter was a mixture of diastereomers. These diols were used to synthesize 5-ethoxy-1,3-dioxepan and 2,2,4-trimethyl-6-ethoxy-1,3-dioxepan. Gas-liquid chromatography was used to demonstrate that 2,2,4-trimethyl-6-ethoxy-1,3-dioxepan is a mixture of cis and trans isomers; the ratio of these isomers is similar to the ratio of diastereomers in the starting 2-ethoxy-1,4-pentanediol. The configurations of the indicated isomers were evaluated by conformational analysis.See [1] for communication XIII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 3–6, January, 1972. 相似文献
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E. D. Donets E. E. Donets E. M. Syresin A. E. Dubinov I. V. Makarov S. A. Sadovoi S. K. Saikov V. P. Tarakanov 《Technical Physics》2011,56(5):690-696
The results of 2.5D particle-in-cell simulation of a coaxial electron trap with an internal anode are reported. It is found
that, when the circulating current reaches the value of the ultimate vacuum current, first a virtual cathode arises in the
trap and then the beam compresses (distributed virtual cathode). The transient preceding the compressed state exhibits complicated
nonlinear dynamics, when compressed regions alternate with regions that are in a two-flow state (phase-space bubbles or phase-space
holes). Physically, phase-space holes are similar to the well-known Bernstein-Greene-Kruskal plasma structures. Three types
of phasespace holes with different dynamics (oscillating holes, flying holes, and chaotic holes) are revealed. Consideration
of phase-space holes as quasi-particles makes it possible to find several channels of their interaction in pair collisions.
The feasibility of the coaxial trap as a source of highly charged ions is analyzed. Although the compressed beam mode provides
a larger amount of accumulated electrons compared with the conventional two-flow mode, the mean kinetic energy in the presence
of a virtual cathode turns out to be much lower. A way of elevating the mean kinetic energy is suggested that consists in
increasing the limit vacuum current in the axial configuration with an internal electrode. 相似文献
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A new multiscale modeling method for simulating the loss processes in polymer solar cell nanodevices
The photoelectric power conversion efficiency of polymer solar cells is till now, compared to conventional inorganic solar cells, still relatively low with maximum values ranging from 7% to 8%. This essentially relates to the existence of exciton and charge carrier loss phenomena, reducing the performance of polymer solar cells significantly. In this paper we introduce a new computer simulation technique, which permits to explore the causes of the occurrence of such phenomena at the nanoscale and to design new photovoltaic materials with optimized opto-electronic properties. Our approach consists in coupling a mesoscopic field-theoretic method with a suitable dynamic Monte Carlo algorithm, to model the elementary photovoltaic processes. Using this algorithm, we investigate the influence of structural characteristics and different device conditions on the exciton generation and charge transport efficiencies in case of a novel nanostructured polymer blend. More specifically, we find that the disjunction of continuous percolation paths leads to the creation of dead ends, resulting in charge carrier losses through charge recombination. Moreover, we observe that defects are characterized by a low exciton dissociation efficiency due to a high charge accumulation, counteracting the charge generation process. From these observations, we conclude that both the charge carrier loss and the exciton loss phenomena lead to a dramatic decrease in the internal quantum efficiency. Finally, by analyzing the photovoltaic behavior of the nanostructures under different circuit conditions, we demonstrate that charge injection significantly determines the impact of the defects on the solar cell performance. 相似文献