全文获取类型
收费全文 | 944篇 |
免费 | 12篇 |
专业分类
化学 | 507篇 |
晶体学 | 10篇 |
力学 | 39篇 |
数学 | 89篇 |
物理学 | 311篇 |
出版年
2022年 | 12篇 |
2021年 | 9篇 |
2020年 | 16篇 |
2019年 | 22篇 |
2018年 | 19篇 |
2017年 | 20篇 |
2016年 | 24篇 |
2015年 | 12篇 |
2014年 | 28篇 |
2013年 | 32篇 |
2012年 | 29篇 |
2011年 | 40篇 |
2010年 | 30篇 |
2009年 | 34篇 |
2008年 | 31篇 |
2007年 | 27篇 |
2006年 | 25篇 |
2005年 | 13篇 |
2004年 | 24篇 |
2003年 | 15篇 |
2002年 | 11篇 |
2001年 | 19篇 |
2000年 | 16篇 |
1999年 | 11篇 |
1998年 | 13篇 |
1997年 | 14篇 |
1996年 | 16篇 |
1995年 | 13篇 |
1994年 | 26篇 |
1993年 | 21篇 |
1992年 | 18篇 |
1991年 | 20篇 |
1990年 | 22篇 |
1989年 | 18篇 |
1988年 | 14篇 |
1987年 | 24篇 |
1986年 | 11篇 |
1985年 | 16篇 |
1984年 | 11篇 |
1983年 | 18篇 |
1982年 | 11篇 |
1980年 | 12篇 |
1979年 | 17篇 |
1978年 | 15篇 |
1977年 | 10篇 |
1976年 | 7篇 |
1972年 | 13篇 |
1971年 | 11篇 |
1970年 | 9篇 |
1968年 | 9篇 |
排序方式: 共有956条查询结果,搜索用时 15 毫秒
1.
2.
R. A. Kotel’nikova G. N. Bogdanov G. V. Zotina V. S. Romanova Z. N. Parnes 《Physics of the Solid State》2002,44(3):576-577
Efficient quenching of eosin phosphorescence by amino-acid derivatives of fullerene (AADFs) such as C60-alanine and C60-glycine in aqueous solutions indicates the possibility of transferring electrons from eosin to fullerene upon collisions or in the exciplex state. To investigate electron transfer in the protein structure, we studied the process of incorporation of C60-alanine and C60-glycine into the heme pocket of myoglobin by controlling Förster quenching. The dissociation constant for the protein-AADF complex was estimated. 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(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
4.
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
5.
A nonlocal Hamiltonian formalism for semi-Hamiltonian systems of the hydrodynamic type is constructed using the formal Baker-Akhiezer
functions for a (2+1)-dimensionaln-wave system.
Translated from Teoreticheskaya i Matematicheskaya Fizika. Vol. 116, No. 1, pp. 113–121 July, 1998. 相似文献
6.
Zusammenfassung Komplexometrische Methoden zur Bestimmung von Zink in Gegenwart von Palladium(II) wurden ausgearbeitet. Dabei wird Palladium(II) mit Kaliumcyanid getarnt und der Zinkgehalt entweder bei pH 5,8 oder nach Demaskierung mit Chloralhydrat bei pH 10 mit ÄDTA gegen Methylthymolblau titriert. Diese Zinkbestimmung läßt sich auch in Anwesenheit einer Mischung von Palladium(II), Kupfer(II), Nickel und Kobalt(II) durchführen.
Summary Complexometric methods have been developed for determining zinc in the presence of palladium(II). In these procedures, Pa(II) is masked with potassium cyanide and the zinc content is titrated either at pH 5.8 or after demasking with chloralhydrate is titrated with EDTA at pH 10 in the presence of methylthymol blue. This zinc determination may also be conducted in the presence of a mixture of palladium(II), copper(II), nickel(II),and cobalt(II).相似文献
7.
8.
Smirnov B. L. Tubolkin A. E. Britov V. P. Nikolaev O. O. Bogdanov V. V. 《Russian Journal of Applied Chemistry》2004,77(3):493-496
The applicability of the previously developed principles of activating mixing to modification of rubbers in solutions was tested, and a process was developed for mechanochemical modification of cis-1,4-polyisoprene in rotary pulsation apparatus. 相似文献
9.
V. S. Bogdanov S. V. Baranin A. Dib I. P. Yakovlev V. A. Dorokhov 《Russian Chemical Bulletin》1992,41(9):1693-1699
Mono- and binuclear boron chelates have been synthesized by the action of butylthiodibutylborane on the ethyl esters of 4-[N-(R-pyrid-2-yl)carbamoyl]-3-amino-2-cyanobuten-2-ic acids (codimers of N-(R-pyrid-2-yl) amides and the ethyl ester of cyanoacetic acid). Complexes of this type can exist in solution in the form of two tautomers: acetamide acid derivatives or the corresponding ketene N,O-acetals.N. D. Zelinski Institute of Organic Chemistry, Russian Academy of Sciences, 117913 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 9, pp. 2162–2170, September, 1992. 相似文献
10.
Ya. L. Gol'dfarb M. A. Kalik V. S. Bogdanov V. K. Zav'yalova 《Russian Chemical Bulletin》1985,34(12):2547-2549
Conclusions In polar solvents (ethanol and chloroform), 2,5-bis(methylthio)-3,4-bis-(o-hydroxyphenyliminomethyl) thiophene undergoes intramolecular rearrangement to 2,5-bis(methylthio)-3-(2-benzoxazolyl)-4-(o-hydroxyphenylaminomethyl) thiophene.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2750–2753, December, 1985. 相似文献