检索结果-南通市图书馆

ON REdUCTION OF MULTICOMPONENT COSMOLOGY TO TOdA LATTICE

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1990年第3期7卷 97-100页

作者： V.d.Ivashchuk V.N.melnikov USSR State Committee for Standards 9 Leninsky prospectMoscow 117049USSR

We prove that Gibbons-Maeda reduction of two-component cosmology to the Toda lattice can not be generalyzed for n-component case.

关键词： MULTI lattice component

On Charged Black Hole in Multidimensional Theory with Ricci-Flat Internal Spaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1991年第9期8卷 439-441页

作者： S.B.Fadeev V.d.Ivashchuk V.N.melnikov USSR State Committee for Standards 9 Leninski Prospect117049MoscowUSSR

A generalization of the Reissner-Nordstrom solution for the case of n internal Ricci-flat spaces is obtained.

关键词： Ricci generalization Reissner

Application of integrated simulation environment SIEMNEd to the analysis of the MEPHIST-0 tokamak operation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2023年第3期25卷 222-233页

作者： d Yu SYCHUGOV S Yu SOLOVIEV A S ZHILKIN A V melnikov S A KRAT Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University National Research Centre Kurchatov Institute National Research Nuclear University Moscow Engineering Physics Institute National University Moscow Institute of Physics and Technology

This paper presents the results of numerical simulation of plasma equilibrium and stability in the MEPHIST-0 tokamak with SIEMNEd software and comparison of simulation results with *** determined characteristics of the vacuum chamber show that it significantly affects the entire *** various scenarios of the inductor operation,a comparison of experimental data and simulated currents and magnetic fields induced in the chamber was carried *** steady-state tokamak operation,a numerical study of equilibrium plasma configurations was carried out depending on the currents in the poloidal magnetic field coils and plasma *** vertical plasma instability was *** limiting values of plasma ellipticity preventing the vertical plasma instability were numerically *** simulations show that plasma equilibrium is supported by induced *** was shown numerically that magnetic configuration with‘zero of higher order’were obtained before the plasma shot,suggesting consistency between the simulation results and observations.

关键词： mathematical modelling tokamak installation MEPHIST-0

在线全文

学校读者我要写书评

暂无评论

中国东北兴安岭地区年冻融频次的分布规律

冰川冻土 2022年第2期44卷 415-426页

作者：魏豪张泽 Andrey melnikov 金豆豆高思如冯文杰中国科学院西北生态环境资源研究院冻土工程国家重点实验室甘肃兰州730000 东北林业大学土木工程学院/寒区科学与工程研究院黑龙江哈尔滨150040 东北林业大学东北多年冻土区地质环境系统教育部野外科学观测研究站/东北多年冻土区环境、道路建设与养护协同创新中心黑龙江哈尔滨150040 俄罗斯科学院西伯利亚分院梅尔尼科夫冻土研究所俄罗斯联邦雅库茨克117997 中国科学院大学北京100049

冻融循环是影响寒区工程和环境变化的重要因素之一,而年冻融频次(冻融循环的年累计量)是可以直接标定冻融循环对寒区工程和环境造成影响大小的物理量,对寒区环境下年冻融频次的调查有重要意义。以中国东北兴安岭地区为研究对象,选取兴... 详细信息

冻融循环是影响寒区工程和环境变化的重要因素之一,而年冻融频次(冻融循环的年累计量)是可以直接标定冻融循环对寒区工程和环境造成影响大小的物理量,对寒区环境下年冻融频次的调查有重要意义。以中国东北兴安岭地区为研究对象,选取兴安岭地区18个气象站点1990—2017年地表温度数据进行整理,得出兴安岭地区各个站点的年冻融频次,并在空间分布和时间序列上分析了年冻融频次的变化情况。结果表明:年冻融频次在中国东北兴安岭地区随着纬度增加逐渐增多,随着经度的增加逐渐减少,随着海拔升高而逐渐增多,且均具有良好的线性趋势;年冻融频次在1990—2017年呈明显的减少趋势,在2004年前后发生突变。进一步分析发现,在影响年冻融频次空间分布的3个因素中,经纬度影响较大,海拔影响相对较小;在时间上年冻融频次变化与东北地区NdVI变化情况呈现良好的负相关性,表明年冻融频次在一定程度上与当地植被覆盖度有关,且随植被覆盖度的增加而减少。

关键词：年冻融频次兴安岭中国东北经度纬度海拔

disease modifying treatment of spinal cord injury with directly reprogrammed neural precursor cells in non-human primates

在线全文

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2021年第5期13卷 452-469页

作者： Vladimir P Baklaushev Oleg V durov Vladimir A Kalsin Eugene V Gulaev Sergey V Kim Ilya L Gubskiy Veronika A Revkova Ekaterina M Samoilova Pavel A melnikov dzhina d Karal-Ogly Sergey V Orlov Alexander V Troitskiy Vladimir P Chekhonin Alexander V Averyanov Jan-Eric Ahlfors Biomedical Research Federal Research and Clinical Center of Specialized Medical Care and Medical TechnologiesFMBA of RussiaMoscow 115682MoskvaRussia department of Neurosurgery Federal Research and Clinical Center of Specialized Medical Care and Medical TechnologiesFMBAMoscow 115682MoskvaRussia department of Anesthesiology N.N.Blokhin Russian Cancer Research CentreMoscow 115478MoskvaRussia Radiology and Clinical Physiology Scientific Research Center Federal center of brain research and neurotechnologies of the Federal Medical Biological AgencyMoscow 117997Russia department of Neurobiology Serbsky National Medical Research Center for Psychiatry and NarcologyMoscow 119992MoskvaRussia department of Primatology Russian Acad Med SciResearch Institute of Medical PrimatologySochi 119992SochiRussia department of Vascular Surgery Federal Research and Clinical Center of Specialized Medical Care and Medical TechnologiesFMBA of RussiaMoscow 115682MoskvaRussia department of Basic and Applied Neurobiology V.P.Serbsky Federal Medical Research Center for Psychiatry and NarcologyRussia department of Medical Nanobiotechnology Pirogov Russian National Research Medical University(RNRMU)Moscow 115682MoskvaRussia New World Laboratories Laval H7V 4A7QuebecCanada

BACKGROUNd The development of regenerative therapy for human spinal cord injury(SCI)is dramatically restricted by two main challenges:the need for a safe source of functionally active and reproducible neural stem cells and the need of adequate animal models for preclinical *** reprogramming of somatic cells into neuronal and glial precursors might be a promising solution to the first *** use of non-human primates for preclinical studies exploring new treatment paradigms in SCI results in data with more translational relevance to human *** To investigate the safety and efficacy of intraspinal transplantation of directly reprogrammed neural precursor cells(drNPCs).METHOdS Seven non-human primates with verified complete thoracic SCI were divided into two groups:drNPC group(n=4)was subjected to intraspinal transplantation of 5 million drNPCs rostral and caudal to the lesion site 2 wk post injury,and lesion control(n=3)was injected identically with the equivalent volume of *** Follow-up for 12 wk revealed that animals in the drNPC group demonstrated a significant recovery of the paralyzed hindlimb as well as recovery of somatosensory evoked potential and motor evoked potential of injured *** resonance diffusion tensor imaging data confirmed the intraspinal transplantation of drNPCs did not adversely affect the morphology of the central nervous system or cerebrospinal fluid *** immunohistochemical analysis showed that drNPCs maintained SOX2 expression characteristic of multipotency in the transplanted spinal cord for at least 12 wk,migrating to areas of axon growth *** Our data demonstrated that drNPC transplantation was safe and contributed to improvement of spinal cord function after acute SCI,based on neurological status assessment and neurophysiological recovery within 12 wk after *** functional improvement described was not associated with neuronal differentiation of th

关键词： direct cell reprogramming Neural precursor cells directly reprogrammed neural precursor cells Spinal cord injury Nonhuman primates Regenerative therapy,Evoked potentials

Russian VLBI network "Quasar":Current status and outlook

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2019年第2期10卷 150-156页

作者： N.Shuygina d.Ivanov A.Ipatov I.Gayazov d.Marshalov A.melnikov S.Kurdubov M.Vasilyev G.Ilin E.Skurikhina I.Surkis V.Mardyshkin A.Mikhailov A.Salnikov A.Vytnov I.Rakhimov A.dyakov V.Olifirov Institute of Applied Astronomy of the Russian Academy of Sciences

This paper presents the past,present and future status of the Russian VLBI network "Quasar".This network has been developed for at least 20 years by the Institute of Applied Astronomy of the Russian Academy of Sciences(IAA RAS). The equipment installed currently at each "Quasar" station and the facilities for processing observational data are described briefly. The latest results are presented, including the Earth orientation parameters(EOP) determined from the "Quasar" VLBI data and comparison with those from other processing centers. Our future plans to extend the "Quasar" VLB I network to the east and to the west will be carried out by establishing the Ussurijsk station in the Far East and the RussianCuban station in the west. They are considered in the context of the Russian section activity in the GGOS project. The expected improvement of the EOP determination accuracy can be obtained within the future configuration of the "Quasar" network,which is proved by simulation.

关键词： Russian VLBI network 'Quasar' VLBI co-location station Space geodesy technique Global Geodetic Observing System (GGOS)

Phase-matched third-harmonic generation via doubly resonant optical surface modes in 1d photonic crystals

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 424-429页

作者： Valery N Konopsky Elena V Alieva Sergey Yu Alyatkin Alexey A melnikov Sergey V Chekalin Vladimir M Agranovich Institute of Spectroscopy Fizicheskaya5TroitskMoscow 142190Russia Moscow Institute of Physics and Technology Institutskiy per.9Dolgoprudny 141700Russia

Efficient nonlinear conversion requires that interacting optical waves maintain a consistent phase relationship when traveling in a medium despite its *** phase-matching,which is often used to compensate for the dispersion,is not applicable to optically isotropic nonlinear ***,we present a one-dimensional photonic crystal structure that allows the propagation of optical surface waves,both at the fundamental and third-harmonic frequencies,as an efficient medium for phasematched third-harmonic generation.A unique advantage of this structure is that the effective refractive indices for the surface waves are similar to the refractive index of air at both *** allows phase-matching between the first and third harmonics,and a visible collinear beam of the third harmonic is produced at the prism-coupled ***,these optical surface waves propagate over long distances even if a lossy nonlinear nanofilm is deposited onto the photonic crystal *** provide experimental results for third-harmonic generation at a wavelength of 410 nm for a bare dielectric Ta2O5/SiO2 multilayer structure and for the same structure coated with a 15-nm GaAs film.

关键词： nonlinear optics optical surface waves photonic crystals

应用浅表静脉引流腹壁下动脉穿支皮瓣(dIEP)乳房再造术

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国医疗美容 2018年第10期8卷 27-29页

作者：陈阔 Reshetov I. Sinelnikov M. melnikov d. Starceva O. 莫斯科国立谢东诺夫第一医科大学俄罗斯莫斯科119435

目的总结应用浅表静脉引流腹壁下动脉穿支皮瓣(dIEP)乳房再造术的手术方法,探讨分析其适应证及优点。方法精细解剖浅表腹部静脉系统,并游离腹部浅表静脉及腹壁下动、静脉穿支,形成带有浅表静脉的腹壁下动脉穿支蒂皮瓣,将腹壁下动、静脉... 详细信息

目的总结应用浅表静脉引流腹壁下动脉穿支皮瓣(dIEP)乳房再造术的手术方法,探讨分析其适应证及优点。方法精细解剖浅表腹部静脉系统,并游离腹部浅表静脉及腹壁下动、静脉穿支,形成带有浅表静脉的腹壁下动脉穿支蒂皮瓣,将腹壁下动、静脉与患者胸廓内血管相吻合,浅表静脉与胸骨旁穿支血管静脉相吻合,进行乳房再造。结果自2016年起莫斯科国立谢东诺夫第一医科大学第一附属医院整形与重建外科此种术式临床应用35例,所有皮瓣全部存活,再造乳房外形满意。结论应用浅静脉吻合胸骨旁穿支血管静脉引流,可有效防止皮瓣灌注不足及静脉危象造成的危险并发症,使皮瓣成活率提高,达到手术最终目的。

关键词：静脉引流,腹壁下动脉穿支皮瓣,乳房再造术

Probing the Wave Nature of Light-Matter Interaction

在线全文

学校读者我要写书评

暂无评论

World Journal of Condensed Matter Physics 2018年第2期8卷 62-89页

作者： d.E.Boone C.H.Jackson A.T.Swecker J.S.Hergenrather K.S.Wenger O.Kokhan B.Terzic I.melnikov I.N.Ivanov E.C.Stevens G.Scarel College of Integrated Science and Engineering James Madison UniversityHarrisonburgVirginiaUSA department of Physics and Astronomy James Madison UniversityHarrisonburgVAUSA department of Chemistry and Biochemistry James Madison UniversityHarrisonburgVAUSA department of Physics Old Dominion UniversityNorfolkVAUSA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTNUSA department of Chemical and Biomolecular Engineering North Carolina State UniversityCentennial CampusRaleighNCUSA

The wave-particle duality of light is a controversial topic in modern physics. In this context, this work highlights the ability of the wave-nature of light on its own to account for the conservation of energy in light-matter interaction. Two simple fundamental properties of light as wave are involved: its period and its power P. The power P depends only on the amplitude of the wave’s electric and magnetic fields (Poynting’s vector), and can easily be measured with a power sensor for visible and infrared lasers. The advantage of such a wave-based approach is that it unveils unexpected effects of light’s power P capable of explaining numerous results published in current scientific literature, of correlating phenomena otherwise considered as disjointed, and of making predictions on ways to employ the electromagnetic (EM) waves which so far are unexplored. In this framework, this work focuses on determining the magnitude of the time interval that, coupled with light’s power P, establishes the energy conserved in the exchange of energy between light and matter. To reach this goal, capacitors were excited with visible and IR lasers at variable average power P. As the result of combining experimental measurements and simulations based on the law of conservation of energy, it was found that the product of the period of the light by its power P fixes the magnitude of the energy conserved in light’s interaction with the capacitors. This finding highlights that the energy exchanged is defined in the time interval equal to the period of the light’s wave. The validity of the finding is shown to hold in light’s interaction with matter in general, e.g. in the photoelectric effect with x-rays, in the transfer of electrons between energy levels in semiconducting interfaces of field effect transistors, in the activation of photosynthetic reactions, and in the generation of action potentials in retinal ganglion cells to enable vision in vertebrates. Finally, the validity of the find

关键词： Infrared Light-Matter Interaction Conservation Of Energy Wave Energy Harvesting