全文获取类型
收费全文 | 156篇 |
免费 | 2篇 |
专业分类
化学 | 35篇 |
晶体学 | 2篇 |
力学 | 2篇 |
数学 | 5篇 |
物理学 | 114篇 |
出版年
2022年 | 6篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 4篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 8篇 |
2012年 | 8篇 |
2011年 | 6篇 |
2010年 | 1篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有158条查询结果,搜索用时 374 毫秒
1.
E. A. Bogdanov A. A. Kudryavtsev L. D. Tsendin R. R. Arslanbekov V. I. Kolobov V. V. Kudryavtsev 《Technical Physics》2003,48(9):1151-1158
Comprehensive self-consistent simulations of the positive column plasma of a dc oxygen discharge are performed with the help
of commercial CFDRC software (), which enables one to carry out computations in an arbitrary 3D geometry using fluid equations for heavy components and
a kinetic equation for electrons. The main scaling laws for the spatial distributions of charged particles are determined.
These scaling laws are found to be quite different in the parameter ranges that are dominated by different physical processes.
At low pressures, both the electrons and negative ions in the inner discharge region obey a Boltzmann distribution; as a result,
a flat profile of the electron density and a parabolic profile of the ion density are established there. In the ion balance,
transport processes prevail, so that ion heating in an electric field dramatically affects the spatial distribution of the
charged particles. At elevated pressures, the volume processes prevail in the balance of negative ions and the profiles of
the charged particle densities in the inner region turn out to be similar to each other. 相似文献
2.
A study is made of the laws governing high-temperature creep and the evolution of the substructure in dispersion-hardened
alloy Ni — 3 vol. % HfO2 during its free annealing and creep. The polygonized substructure was formed in the alloy prior to annealing. An analysis
is made of structural transformations at different structural levels and the mechanism of high-temperature creep in the alloy.
Institute of the Physics of Strength and Materials Science, Siberian Branch of the Russian Academy of Sciences. All-Republic
Engineering-Technical Center, Siberian Branch of the Russian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh
Zavedenii, Fizika, No. 3, pp. 83–89, March, 1998. 相似文献
3.
E. A. Bogdanov A. A. Kudryavtsev L. D. Tsendin R. R. Arslanbekov V. I. Kolobov V. V. Kudryavtsev 《Technical Physics》2003,48(8):983-994
Results from kinetic and fluid simulations of the positive column plasma of a dc oxygen discharge are compared using commercial
CFDRC software (), which enables one to perform numerical simulations in an arbitrary 3D geometry with the use of both the fluid equations
for all the components (fluid model) and the kinetic equation for the electron energy distribution function (kinetic model).
It is shown that, for both the local and nonlocal regimes of the formation of the electron energy distribution function (EEDF),
the non-Maxwellian EEDF can satisfactorily be approximated by two groups of electrons. This allows one to take into account
kinetic effects within the conventional fluid model in the simplest way by using the proposed two-temperature approximation
of the nonequilibrium and nonlocal EEDF (2T fluid model). 相似文献
4.
5.
We propose finitely convergent methods for solving convex feasibility problems defined over a possibly infinite pool of constraints. Following other works in this area, we assume that the interior of the solution set is nonempty and that certain overrelaxation parameters form a divergent series. We combine our methods with a very general class of deterministic control sequences where, roughly speaking, we require that sooner or later we encounter a violated constraint if one exists. This requirement is satisfied, in particular, by the cyclic, repetitive and remotest set controls. Moreover, it is almost surely satisfied for random controls.
相似文献6.
7.
A. N. Tyumentsev A. D. Korotaev Yu. P. Kolobov K. A. Markov Yu. P. Pinzhin S. F. Tyumentseva 《Russian Physics Journal》1982,25(5):447-451
The paper gives the results of investigations on the rate of coalescence of zirconium oxides in Nb-Mo-ZrO2 alloy. On the basis of experimental results and theoretical estimates, it is shown that the stability of zirconium oxides in a niobium matrix increases substantially when the oxygen content in the solid solution rises. A high stability of zirconium oxides in niobium, which ensures a considerable (up to T 1800°C) increase in the recrystallization temperature and enhancement of the mechanical properties of the alloys at T 1100°C can be attained at an oxygen content C0 0.2–0.5 at.% in the solid solution.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 76–79, May, 1982. 相似文献
8.
A. V. Kolobov H. Oyanagi S. A. Gurevich T. A. Zaraiskaya V. V. Horenko V. V. Poborchii K. Tanaka 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1997,40(1):520-522
Results of X-ray absorption studies of copper nanoclusters embedded in SiO2 matrix and selenium chains confined in channels of cancrinite are reported. Initially randomly distributed copper atoms mainly surrounded by silicon species in an as-made film upon annealing form copper nanoclusters with a characteristic size of 80 Å and the structure identical to that of bulk copper. The characteristic size of the clusters does not increase with further annealing. Selenium in cancrinite is shown to form strongly oriented linear dimerised chains with a bond length much larger than that in bulk forms of selenium. 相似文献
9.
O. N. Fedyaeva A. A. Vostrikov V. R. Antipenko A. V. Shishkin V. I. Kolobov M. Ya. Sokol 《Russian Journal of Physical Chemistry B, Focus on Physics》2017,11(7):1117-1128
The effect of supercritical water and pyrite on the transformations of propylene upon the uniform heating (1.5 K/min) of reagents to 718 K is studied. The products are analyzed by IR and 1H NMR spectroscopy, mass-spectrometry and gas chromatography/mass-spectrometry. It is established based on the temperature dependences of the pressure of reagents that the addition of pyrite in the absence of water gives rise to a decrease in the starting temperature of propylene oligomerization. In the absence of pyrite, the addition of water suppresses propylene oligomerization. A synergetic effect of supercritical water and pyrite on the degree of conversion of propylene is revealed. It is shown that hydrogen sulfide, thiols, and methyl-derivatives of thiophene are formed in the presence of pyrite, as well as the yield of aromatic and polyaromatic hydrocarbons increases. The mechanisms of the observed processes are discussed. 相似文献
10.
Yu. Yu. Morzherin M. Yu. Kolobov V. S. Mokrushin M. Brauer E. Anders V. A. Bakulev 《Chemistry of Heterocyclic Compounds》2000,36(1):22-36
A series of N-alkyl- and N-aryl-2-cyano-2-diazoacetamides was synthesized by the reaction of 2-amino-2-cyanoacetamides with sodium nitrite in hydrochloric acid. The mechanism of their heteroclectrocyclization to 5-hydroxy-1,2,3-triazoles was investigated kinetically and theoretically by the B3LYP/6-31+G* method. The conclusion was made on the basis of the determined activation energy of the cyclization process. reaction parameters , and kinetic isotope effects, that there is a difference between the mechanisms of cyclization of the N-alkyl and N-aryl derivatives of 2-cyano-2-diazoacetamide; cyclization of the N-alkyl derivatives takes place by a monorotatory mechanism, while cyclization of the N-aryl derivatives takes place by a mechanism where one of the stages is heteroelectrocyclization of 2-diazoacetimidates.For Communication 5, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 26–41, January, 2000. 相似文献