全文获取类型
收费全文 | 356107篇 |
免费 | 2341篇 |
国内免费 | 640篇 |
专业分类
化学 | 170369篇 |
晶体学 | 5411篇 |
力学 | 18521篇 |
综合类 | 9篇 |
数学 | 52541篇 |
物理学 | 112237篇 |
出版年
2019年 | 2291篇 |
2018年 | 11088篇 |
2017年 | 11869篇 |
2016年 | 8210篇 |
2015年 | 3410篇 |
2014年 | 4388篇 |
2013年 | 10777篇 |
2012年 | 12033篇 |
2011年 | 21168篇 |
2010年 | 13568篇 |
2009年 | 13464篇 |
2008年 | 18860篇 |
2007年 | 22218篇 |
2006年 | 9055篇 |
2005年 | 13927篇 |
2004年 | 10448篇 |
2003年 | 9878篇 |
2002年 | 7943篇 |
2001年 | 7474篇 |
2000年 | 5963篇 |
1999年 | 4396篇 |
1998年 | 3897篇 |
1997年 | 3861篇 |
1996年 | 3756篇 |
1995年 | 3434篇 |
1994年 | 3580篇 |
1993年 | 3266篇 |
1992年 | 3731篇 |
1991年 | 3735篇 |
1990年 | 3672篇 |
1989年 | 3540篇 |
1988年 | 3655篇 |
1987年 | 3543篇 |
1986年 | 3359篇 |
1985年 | 4444篇 |
1984年 | 4730篇 |
1983年 | 3959篇 |
1982年 | 4091篇 |
1981年 | 4017篇 |
1980年 | 3990篇 |
1979年 | 3975篇 |
1978年 | 4293篇 |
1977年 | 4140篇 |
1976年 | 4229篇 |
1975年 | 3897篇 |
1974年 | 3938篇 |
1973年 | 4127篇 |
1972年 | 2883篇 |
1971年 | 2399篇 |
1970年 | 2205篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
891.
This paper deals with a computational analysis of the influence of the pressing method and part geometry on the final density
distribution in the cold compaction process of ceramic alumina powders. The analysis is based on the explicit finite-element
model proposed and validated in a previous study. The mechanical behavior of the processing material is described using a
multisurface elastoplastic model, the modified Drucker-Prager/Cap model
Published in Prikladnaya Mekhanika, Vol. 43, No. 10, pp. 129–134, October 2007. 相似文献
892.
Günter F. Steinke 《Journal of Geometry》2007,87(1-2):160-178
893.
V. Goryunov 《Proceedings of the Steklov Institute of Mathematics》2007,258(1):44-52
We establish a natural correspondence between the finite order automorphisms of the function singularities X
9 and the complex crystallographic groups. A complete list of the related objects is obtained.
To Vladimir Igorevich on the occasion of his 70th birthday 相似文献
894.
This is a write-up on the foundation of the Sobolev Institute of Mathematics in 1957. 相似文献
895.
S. Al-Homidan 《Journal of Optimization Theory and Applications》2007,135(3):583-598
Given a data matrix, we find its nearest symmetric positive-semidefinite Toeplitz matrix. In this paper, we formulate the
problem as an optimization problem with a quadratic objective function and semidefinite constraints. In particular, instead
of solving the so-called normal equations, our algorithm eliminates the linear feasibility equations from the start to maintain
exact primal and dual feasibility during the course of the algorithm. Subsequently, the search direction is found using an
inexact Gauss-Newton method rather than a Newton method on a symmetrized system and is computed using a diagonal preconditioned
conjugate-gradient-type method. Computational results illustrate the robustness of the algorithm. 相似文献
896.
897.
898.
E. V. Suchilkina 《Journal of Mathematical Sciences》2007,147(1):6510-6516
At the end of the twentieth century, in mathematical physics, the Knizhnik-Zamolodchikov equations for the root systems A
n
and their generalizations for the root systems of types B
n
, C
n
, and D were constructed. For the root system of type G
2, the vector version of the Knizhnik-Zamolodchikov equations was obtained by M. P. Zamakhovskii and V. P. Leksin. However,
the tensor version of these equations has remained unstudied. In this paper, the Knizhnik-Zamolodchikov equations associated
with the root system of type G
2 are considered.
__________
Translated from Sovremennaya Matematika i Ee Prilozheniya (Contemporary Mathematics and Its Applications), Vol. 38, Suzdal
Conference-2004, Part 3, 2006. 相似文献
899.
900.