全文获取类型
收费全文 | 647篇 |
免费 | 0篇 |
专业分类
化学 | 373篇 |
晶体学 | 2篇 |
力学 | 14篇 |
数学 | 25篇 |
物理学 | 233篇 |
出版年
2022年 | 8篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 17篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 23篇 |
2015年 | 7篇 |
2014年 | 14篇 |
2013年 | 15篇 |
2012年 | 13篇 |
2011年 | 16篇 |
2010年 | 22篇 |
2009年 | 21篇 |
2008年 | 15篇 |
2007年 | 23篇 |
2006年 | 15篇 |
2005年 | 18篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 18篇 |
2001年 | 13篇 |
2000年 | 8篇 |
1999年 | 15篇 |
1997年 | 10篇 |
1995年 | 6篇 |
1994年 | 10篇 |
1992年 | 9篇 |
1989年 | 15篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1984年 | 6篇 |
1983年 | 7篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1978年 | 7篇 |
1976年 | 11篇 |
1974年 | 8篇 |
1973年 | 9篇 |
1970年 | 11篇 |
1969年 | 18篇 |
1968年 | 23篇 |
1967年 | 13篇 |
1966年 | 11篇 |
1964年 | 8篇 |
1962年 | 9篇 |
1961年 | 5篇 |
1956年 | 5篇 |
1955年 | 6篇 |
排序方式: 共有647条查询结果,搜索用时 0 毫秒
1.
2.
A. Yu. Anisimov 《Physics of Atomic Nuclei》2004,67(3):640-647
We provide a detailed numerical study of the influence of thermal effects on the original picture of the Affleck-Dine baryogenesis. These effects are found to modify the results greatly in some cases. We estimate the baryon/entropy ratio and provide numerical results on the typical behavior of the charge as a function of the strength of the potential and other parameters. 相似文献
3.
We investigate the properties of maximum likelihood estimators in observation schemes of random variables that arrive at random time moments on a Poisson trajectory defined on some ergodic process.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 59, pp. 98–105, 1986. 相似文献
4.
Young C. Kim Mikhail A. Anisimov Jan V. Sengers Erik Luijten 《Journal of statistical physics》2003,110(3-6):591-609
The character of critical behavior in physical systems depends on the range of interactions. In the limit of infinite range of the interactions, systems will exhibit mean-field critical behavior, i.e., critical behavior not affected by fluctuations of the order parameter. If the interaction range is finite, the critical behavior asymptotically close to the critical point is determined by fluctuations and the actual critical behavior depends on the particular universality class. A variety of systems, including fluids and anisotropic ferromagnets, belongs to the three-dimensional Ising universality class. Recent numerical studies of Ising models with different interaction ranges have revealed a spectacular crossover between the asymptotic fluctuation-induced critical behavior and mean-field-type critical behavior. In this work, we compare these numerical results with a crossover Landau model based on renormalization-group matching. For this purpose we consider an application of the crossover Landau model to the three-dimensional Ising model without fitting to any adjustable parameters. The crossover behavior of the critical susceptibility and of the order parameter is analyzed over a broad range (ten orders) of the scaled distance to the critical temperature. The dependence of the coupling constant on the interaction range, governing the crossover critical behavior, is discussed. 相似文献
5.
Russian Chemical Bulletin - 相似文献
6.
N. S. Prostakov A. V. Varlamov M. Torres B. N. Anisimov M. A. Ryashentseva 《Chemistry of Heterocyclic Compounds》1982,18(3):283-284
3-Methyl-4-benzyl-2,6-diphenylpiperidine was obtained by hydrogenation of 3-methyl-4-benzyl-2,6-diphenylpyridine in the presence of rhenium heptasulfide; this confirms the common character of the method of selective hydrogenation of aryl(aralkyl)-substituted pyridine bases to give similarly substituted piperidines. Dehydrocyclization of this pyridine base by heating with sulfur leads to 10-mercapto-1,3-diphenyl-2-azaanthracene, which was obtained under the same conditions from 1,2-diphenyl-1,2-bis(3-methyl-2,6-diphenyl-4-pyridyl)ethane.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 375–376, March, 1982. 相似文献
7.
A. N. Nesmeyanov I. B. Zlotina M. A. Khomutov I. F. Leshcheva N. E. Kolobova K. N. Anisimov 《Russian Chemical Bulletin》1977,26(3):642-643
Conclusions The cis-trans isomers of the vinylic fluorine substitution product were isolated and characterized when Na[5-C5H5Fe(CO)2] is reacted with ethyl perfluoromethacrylate.Deceased.The authors express their gratitude to E. M. Rokhlin and U. Utebaev for supplying the ethyl perfluoromethacrylate.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 705–706, March, 1977. 相似文献
8.
9.
Published data of the last 10-15 years on the use of the reactions of sulfur dichloride with various unsaturated compounds for the synthesis of oxathia- and thiacrown compounds and study of their extraction characteristics toward various transition and heavy metals are reviewed. Some previously unpublished results and associated experimental data are also included. 相似文献
10.
E. V. Tulyakova O. A. Fedorova Yu. V. Fedorov G. Jonusauskas A. V. Anisimov 《Russian Chemical Bulletin》2007,56(11):2166-2174
Using 1H NMR spectroscopy and steady-state and time-resolved electronic spectroscopy, the optical properties of mono-and bis(styryl)pyridinium
perchlorates and their complexes with Mg2+, Ba2+ cations were studied. The stability constants of the complexes were determined using spectrophotometric titration. The formation
of inclusion complexes for Mg2+ and sandwich type complexes for Ba2+ results in fluorescence enhancement and increases the lifetimes of the excited states of the initial bis-styryl ligands.
The variation of position of the styryl fragment in the pyridinium aromatic ring gives rise to photochromic crown ethers with
different optical and photophysical characteristics and is also an easy route to bis(crown-ethers) of symmetrical and unsymmetrical
structure.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2092–2100, November, 2007. 相似文献