全文获取类型
收费全文 | 11482篇 |
免费 | 828篇 |
国内免费 | 1548篇 |
专业分类
化学 | 3435篇 |
晶体学 | 47篇 |
力学 | 369篇 |
综合类 | 190篇 |
数学 | 8181篇 |
物理学 | 1636篇 |
出版年
2024年 | 14篇 |
2023年 | 130篇 |
2022年 | 159篇 |
2021年 | 257篇 |
2020年 | 275篇 |
2019年 | 327篇 |
2018年 | 313篇 |
2017年 | 355篇 |
2016年 | 265篇 |
2015年 | 251篇 |
2014年 | 408篇 |
2013年 | 1138篇 |
2012年 | 388篇 |
2011年 | 521篇 |
2010年 | 459篇 |
2009年 | 639篇 |
2008年 | 715篇 |
2007年 | 888篇 |
2006年 | 705篇 |
2005年 | 680篇 |
2004年 | 560篇 |
2003年 | 612篇 |
2002年 | 549篇 |
2001年 | 443篇 |
2000年 | 439篇 |
1999年 | 407篇 |
1998年 | 371篇 |
1997年 | 345篇 |
1996年 | 245篇 |
1995年 | 133篇 |
1994年 | 155篇 |
1993年 | 95篇 |
1992年 | 85篇 |
1991年 | 67篇 |
1990年 | 51篇 |
1989年 | 51篇 |
1988年 | 51篇 |
1987年 | 46篇 |
1986年 | 28篇 |
1985年 | 51篇 |
1984年 | 37篇 |
1983年 | 21篇 |
1982年 | 26篇 |
1981年 | 24篇 |
1980年 | 17篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1977年 | 14篇 |
1976年 | 6篇 |
1974年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 515 毫秒
121.
Arthur W. Apter 《Mathematical Logic Quarterly》2006,52(5):457-463
We construct models for the level by level equivalence between strong compactness and supercompactness in which for κ the least supercompact cardinal and δ ≤ κ any cardinal which is either a strong cardinal or a measurable limit of strong cardinals, 2δ > δ + and δ is < 2δ supercompact. In these models, the structure of the class of supercompact cardinals can be arbitrary, and the size of the power set of κ can essentially be made as large as desired. This extends and generalizes [5, Theorem 2] and [4, Theorem 4]. We also sketch how our techniques can be used to establish a weak indestructibility result. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
122.
S. De Winter 《Advances in Mathematics》2007,214(1):146-156
We solve a long-standing open problem by proving that the automorphism group of any thick Payne derived generalized quadrangle with ambient quadrangle S a thick generalized quadrangle of order s, s?5 and odd, with a center of symmetry, is induced by the automorphism group of S. 相似文献
123.
Henrik Stetkær 《Journal of Functional Analysis》2007,252(1):1-33
We extend results on square integrable representations of a locally compact group to subrepresentations of a representations induced from a character of a closed subgroup. We do so working in the framework of quotient representations of ∗-algebras. 相似文献
124.
Salvador Hernández 《Topology and its Applications》2007,154(10):2089-2098
Let C(X,G) be the group of continuous functions from a topological space X into a topological group G with pointwise multiplication as the composition law, endowed with the uniform convergence topology. To what extent does the group structure of C(X,G) determine the topology of X? More generally, when does the existence of a group homomorphism H between the groups C(X,G) and C(Y,G) implies that there is a continuous map h of Y into X such that H is canonically represented by h? We prove that, for any topological group G and compact spaces X and Y, every non-vanishing C-isomorphism (defined below) H of C(X,G) into C(Y,G) is automatically continuous and can be canonically represented by a continuous map h of Y into X. Some applications to specific groups and examples are given in the paper. 相似文献
125.
126.
Wei Gang SU Huai Jie ZHONG 《数学学报(英文版)》2006,22(2):515-522
This paper introduces the concept of the generalized Riesz operators and the concept of the generalized West decomposition of a general operator which generalizes the definition of the West decomposition of Riesz operators, and proves that the following three statements are equivalent on a general Banach space:
(a) Every generalized Riesz operator has the generalized West decomposition;
(b) Every operator makes strong Stampfli theorem true; Every operator has Apostol's compact correction. 相似文献
127.
128.
Applied Biochemistry and Biotechnology - 相似文献
129.
130.
对股份制公司的综合投资方案的决策问题进行了研究.首先依据多个投资方案的风险与收益并存的实际情况,建立了最佳投资组合方案的多目标决策模型.然后,由董事会综合各股东所持股份和相互评价权值,利用群决策的方法得到一个最终投资方案,此方案在理论上能使公司获得最大收益. 相似文献