全文获取类型
收费全文 | 6274篇 |
免费 | 1240篇 |
国内免费 | 510篇 |
专业分类
化学 | 1328篇 |
晶体学 | 20篇 |
力学 | 1014篇 |
综合类 | 96篇 |
数学 | 1952篇 |
物理学 | 3614篇 |
出版年
2024年 | 14篇 |
2023年 | 49篇 |
2022年 | 156篇 |
2021年 | 167篇 |
2020年 | 164篇 |
2019年 | 165篇 |
2018年 | 169篇 |
2017年 | 254篇 |
2016年 | 285篇 |
2015年 | 212篇 |
2014年 | 391篇 |
2013年 | 448篇 |
2012年 | 354篇 |
2011年 | 391篇 |
2010年 | 304篇 |
2009年 | 318篇 |
2008年 | 421篇 |
2007年 | 402篇 |
2006年 | 349篇 |
2005年 | 342篇 |
2004年 | 267篇 |
2003年 | 268篇 |
2002年 | 267篇 |
2001年 | 242篇 |
2000年 | 221篇 |
1999年 | 207篇 |
1998年 | 176篇 |
1997年 | 155篇 |
1996年 | 153篇 |
1995年 | 96篇 |
1994年 | 82篇 |
1993年 | 55篇 |
1992年 | 69篇 |
1991年 | 54篇 |
1990年 | 34篇 |
1989年 | 41篇 |
1988年 | 21篇 |
1987年 | 31篇 |
1986年 | 32篇 |
1985年 | 27篇 |
1984年 | 28篇 |
1983年 | 20篇 |
1982年 | 34篇 |
1981年 | 12篇 |
1980年 | 16篇 |
1979年 | 21篇 |
1978年 | 14篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1936年 | 3篇 |
排序方式: 共有8024条查询结果,搜索用时 203 毫秒
51.
全纯函数族的正规定则 总被引:2,自引:0,他引:2
Let f be a holomorphic function on a domain D Lontaiu in C, and let a be a finite complex number. We denote by -↑Ef/(a) = {z ∈ D : f(z) = a, ignoring multiplicity} the set of all distinct α-points of f. Let F be a family of holomorphic functions on D. If there exist three finite values a, b(≠ O,α) and c(≠ O) such that for every f ∈F, -↑Ef′/(0) Lontain in -↑Ef(α) and -↑Ef′ (b) Lontain in -↑Ef(c), then F is a normal family on D. 相似文献
52.
53.
We study algebraic geometric codes obtained from rational normal scrolls. We determine the complete weight hierarchy and spectrum
of these codes.
相似文献
54.
物理实验课程考核、评估体系初探 总被引:4,自引:0,他引:4
对物理实验课程考核、评估方法进行了探讨,提出了物理实验课程考核、评估体系及实施细则.重点介绍了体系中的核心部分——正规的物理实验课程考试. 相似文献
55.
Ding-kang WANG~ Yan ZHANG Key Laboratory of Mathematics Mechanization Academy of Mathematics Systems Science Chinese Academy of Sciences Beijing China 《中国科学A辑(英文版)》2007,50(10):1441-1450
We present an algorithm to decompose a polynomial system into a finite set of normal ascending sets such that the set of the zeros of the polynomial system is the union of the sets of the regular zeros of the normal ascending sets.If the polynomial system is zero dimensional,the set of the zeros of the polynomials is the union of the sets of the zeros of the normal ascending sets. 相似文献
56.
利用集合在某点的相依切锥、法向锥和可行方向锥等研究向量优化问题的有效点、 弱有效点和真有效点的特征,对局部有效点、局部弱有效点和局部真有效点与集合的各 锥之间的关系作了刻画. 相似文献
57.
Considering external electric field as well as third- and fourth-order phonon anharmonic interaction terms in the pseudospin-lattice
coupled mode (PLCM) model Hamiltonian for KDP-type ferroelectrics, expressions for field-dependent shift, width, renormalized
soft mode frequency, Curie temperature, dielectric constant and dielectric loss are evaluated. For the calculation, method
of statistical double-time temperature-dependent Green’s function has been used. By fitting model values of physical quantities,
temperature and electric field dependences of soft mode frequency, dielectric constant and loss have been calculated which
compare well with experimental results of Baumgartner [8] and Choi and Lockwood [9]. Both dielectric constant and loss decrease
with electric field. 相似文献
58.
S. V. Dil’man 《Mathematical Notes》2006,79(5-6):625-631
In 1996, D. Deng established an analog of the Baum—Katz theorem on the convergence rate in the law of large numbers for multi-indexed random variables. The series describing the convergence rate depends, in a natural way, on the parameter characterizing the excess of the normalized sums over some level. In this paper, we find the precise asymptotics of the sum of this series with respect to the above-mentioned parameter. Thus, a generalization of a recent result due to A. Gut and A. Spataru is obtained. 相似文献
59.
Modern trends in designing mechatronic systems call for a synergic design of the separated subsystems (mechanic, electronic parts, control modules, etc.) concurring to the overall performance. Following this point of view, this paper presents a control oriented model and a nonlinear control design for a Common Rail injection system. First a model is developed, which is tuned in a virtual simulation environment, representing the injection system in details in a reliable replication of reality. Then a sliding mode control is developed. Both the model of the injection process and of the control law are validated by a virtual detailed simulation environment. The prediction capability of the model and the control efficiency are clearly shown. 相似文献
60.
本文给出了C^n中超球B上Hardy空间H^p,Bergman空间Lα^p,Bloch空间β,Besov空间Bp及Lipschitz空间Ak^p之间的系数乘子。 相似文献