全文获取类型
收费全文 | 256035篇 |
免费 | 1093篇 |
国内免费 | 636篇 |
专业分类
化学 | 112994篇 |
晶体学 | 3411篇 |
力学 | 16019篇 |
综合类 | 7篇 |
数学 | 52542篇 |
物理学 | 72791篇 |
出版年
2019年 | 2289篇 |
2018年 | 13676篇 |
2017年 | 13598篇 |
2016年 | 10128篇 |
2015年 | 2674篇 |
2014年 | 3862篇 |
2013年 | 7331篇 |
2012年 | 9216篇 |
2011年 | 16891篇 |
2010年 | 11034篇 |
2009年 | 11578篇 |
2008年 | 12823篇 |
2007年 | 14894篇 |
2006年 | 5810篇 |
2005年 | 6225篇 |
2004年 | 6287篇 |
2003年 | 6299篇 |
2002年 | 5497篇 |
2001年 | 5230篇 |
2000年 | 3971篇 |
1999年 | 2962篇 |
1998年 | 2780篇 |
1997年 | 2592篇 |
1996年 | 2448篇 |
1995年 | 2162篇 |
1994年 | 2082篇 |
1993年 | 2130篇 |
1992年 | 2127篇 |
1991年 | 2443篇 |
1990年 | 2362篇 |
1989年 | 2445篇 |
1988年 | 2320篇 |
1987年 | 2351篇 |
1986年 | 2183篇 |
1985年 | 2702篇 |
1984年 | 2715篇 |
1983年 | 2352篇 |
1982年 | 2412篇 |
1981年 | 2312篇 |
1980年 | 2122篇 |
1979年 | 2437篇 |
1978年 | 2581篇 |
1977年 | 2657篇 |
1976年 | 2745篇 |
1975年 | 2551篇 |
1974年 | 2478篇 |
1973年 | 2659篇 |
1972年 | 2169篇 |
1971年 | 1981篇 |
1970年 | 1850篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
V. A. Khitrov C. Panteleev A. M. Sukhovoj J. Honzátko I. Tomandl 《Physics of Atomic Nuclei》2004,67(10):1818-1822
Main properties of the excited states of 118Sn manifesting themselves in cascade γ decay of its compound state are studied. As in heavier nuclei studied earlier, qualitative interpretation of the whole set
of observed properties of the nucleus appears to be impossible without accounting for coexistence and interaction of quasiparticle
and collective nuclear excitations and their considerable influence on the main parameters of the process under study.
From Yadernaya Fizika, Vol. 67, No. 10, 2004, pp. 1845–1849.
Original English Text Copyright ? 2004 by Khitrov, Panteleev, Sukhovoj, Honzátko, Tomandl.
This article was submitted by the authors in English. 相似文献
992.
993.
The classes ofL
1-matrices,L
2-matrices,L
3-matrices andW-matrices are introduced to study solvability of a linear complementarity problem via solving a linear program. Three sufficient
conditions are presented to guarantee that a linear complementarity problem is solvable via a linear program. The new sufficient
conditions are weaker than the ones introduced by Mangasarian. This fact is also illustrated by an example.
Partially supported by NSFC.
This author is also with College of Business Administration of Human University as a Lotus chair professor. 相似文献
994.
Processes of the inelastic magnetic and weak scattering of tritium-beta-source antineutrinos on the bound electrons of a germanium atom are considered. The results obtained by calculating the spectra and cross sections are presented for the energy-transfer range between 10 eV and 18 keV. 相似文献
995.
The precession motion of magnetization in a longitudinal alternating magnetic field for a system of two antiferromagnetically coupled magnetoactive layers is studied. New dynamic modes characterized by large precession amplitudes and doubling of the period are found. The modes can be efficiently controlled using an external magnetic bias field. A new effect consisting in the unsusceptibility of a magnetic subsystem to excitation by an alternating field has been revealed. 相似文献
996.
The existing model for multivariate skew normal data does not cohere with the joint distribution of a random sample from a
univariate skew normal distribution. This incoherence causes awkward interpretation for data analysis in practice, especially
in the development of the sampling distribution theory. In this paper, we propose a refined model that is coherent with the
joint distribution of the univariate skew normal random sample, for multivariate skew normal data. The proposed model extends
and strengthens the multivariate skew model described in Azzalini (1985,Scandinavian Journal of Statistics,12, 171–178). We present a stochastic representation for the newly proposed model, and discuss a bivariate setting, which confirms
that the newly proposed model is more plausible than the one given by Azzalini and Dalla Valle (1996,Biometrika,83, 715–726). 相似文献
997.
998.
M Khouja 《The Journal of the Operational Research Society》2003,54(9):984-994
Supply chain management literature calls for coordination between the different members of the chain. Materials should be moved from one supplier to the next according to a just-in-time schedule. In this paper, we show that for many supply chain configurations, complete synchronization will result in some members of the chain being ‘losers’ in terms of cost. We develop an algorithm for optimal synchronization of supply chains and provide some guidelines for incentive alignment along the supply chain. In developing the model, we use the economic delivery and scheduling problem model and analyze supply chains dealing with single and multiple components. For single-component supply chains, we derive a closed-form expression for the optimal synchronized cycle time. For multi-component supply chains, we develop an algorithm for finding the optimal synchronized cycle time. We test the performance of the algorithm and show that it provides optimal solutions for a wide range of problems. We illustrate the models with numerical examples. 相似文献
999.
1000.
Aminova G. A. Manuiko G. V. Bronskaya V. V. Bronskii S. N. Ismagilova A. I. D'yakonov G. S. 《Kinetics and Catalysis》2004,45(2):288-296
Based on an analysis of experimental results and published data, the main elementary steps of the anionic coordination polymerization of butadiene rubber on a cobalt-containing catalyst in the presence of ethylene were found, and a mathematical model of the periodic process at an optimum water content was developed. The molecular-weight characteristics of the process depending on ethylene concentration were studied with the use of this model. 相似文献