全文获取类型
收费全文 | 1412295篇 |
免费 | 37180篇 |
国内免费 | 13274篇 |
专业分类
化学 | 722637篇 |
晶体学 | 20629篇 |
力学 | 77621篇 |
综合类 | 435篇 |
数学 | 248264篇 |
物理学 | 393163篇 |
出版年
2021年 | 15311篇 |
2020年 | 17631篇 |
2019年 | 17913篇 |
2018年 | 13241篇 |
2016年 | 29709篇 |
2015年 | 22944篇 |
2014年 | 33152篇 |
2013年 | 77889篇 |
2012年 | 43994篇 |
2011年 | 41292篇 |
2010年 | 39840篇 |
2009年 | 41740篇 |
2008年 | 39069篇 |
2007年 | 34256篇 |
2006年 | 41279篇 |
2005年 | 32277篇 |
2004年 | 33167篇 |
2003年 | 30925篇 |
2002年 | 32016篇 |
2001年 | 32286篇 |
2000年 | 27348篇 |
1999年 | 24337篇 |
1998年 | 22178篇 |
1997年 | 22070篇 |
1996年 | 21952篇 |
1995年 | 19905篇 |
1994年 | 19257篇 |
1993年 | 18696篇 |
1992年 | 19052篇 |
1991年 | 19260篇 |
1990年 | 18418篇 |
1989年 | 18303篇 |
1988年 | 17876篇 |
1987年 | 17766篇 |
1986年 | 16737篇 |
1985年 | 23051篇 |
1984年 | 24152篇 |
1983年 | 20223篇 |
1982年 | 21842篇 |
1981年 | 21021篇 |
1980年 | 20324篇 |
1979年 | 20694篇 |
1978年 | 21880篇 |
1977年 | 21534篇 |
1976年 | 21257篇 |
1975年 | 19977篇 |
1974年 | 19677篇 |
1973年 | 20091篇 |
1972年 | 14599篇 |
1967年 | 12781篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
Mathematical Notes - The notion of a $$\lambda$$ -generalized-search multivalued functional on an $$f$$ -quasimetric space is introduced. An existence theorem for zeros of such functionals is... 相似文献
142.
Theoretical and Mathematical Physics - We present a one-line closed-form expression for the three-parameter breather of the nonlinear Schrödinger equation. This provides an analytic proof of... 相似文献
143.
Zmushko V. V. Razin A. N. Sinelnikova A. A. 《Journal of Applied Mechanics and Technical Physics》2022,63(3):400-407
Journal of Applied Mechanics and Technical Physics - Turbulent mixing at interfaces of three-layer gas systems after shock-wave passage has been studied. The influence of the initial roughness of... 相似文献
144.
Mathematical Programming - In the general equilibrium with incomplete asset markets (GEI) model, the excess demand functions are typically not continuous at the prices for which the assets have... 相似文献
145.
Ukrainian Mathematical Journal - We establish new criteria of compatibility for a linear system of equations (equivalent to the Kronecker–Capelli theorem) or inequalities (equivalent to the... 相似文献
146.
Restricted testing conditions were considered recently. For the maximal operator, Hytönen, Li and Sawyer [8] first obtained parental testing condition. Later, they [9] showed that it suffices to restrict testing to doubling cubes. Chen and Lacey [3] gave a similar restricted testing condition. In our paper, we discuss a version of the latter in the multilinear setting.
相似文献147.
Journal of Fourier Analysis and Applications - We develop a theory of Sobolev orthogonal polynomials on the Sierpiński gasket ( $$SG$$ ), which is a fractal set that can be viewed as a limit... 相似文献
148.
Donglei Wei Huili Li Chuanqing Yang Jianmin Fu Hou Chen Liangjiu Bai Wenxiang Wang Huawei Yang Lixia Yang Ying Liang 《Journal of polymer science. Part A, Polymer chemistry》2022,60(10):1588-1594
Acridone as a new kind of visible light photocatalyst has been developed to catalyze metal free atom transfer radical polymerization (ATRP). The photocatalyst possess low excited state potential as can undergo an oxidative quenching pathway to initiate ATRP of vinyl monomers. Kinetic study and light on/off reaction demonstrate the “living”/controlled nature of the polymerization by light. Block copolymers can be achieved by using PMMA as macroinitiator to reinitiate polymerization of other vinyl monomers, which shows highly preserved Br chain-end functionality in the synthesized polymers. Moreover, the polymerization can be conducted under air atmosphere as most photocatalysts need anaerobic condition, which may give inspiration of further application of this kind of photocatalyst. 相似文献
149.
Chueshova A. G. Pavlova L. A. Peshcherova S. M. Nepomnyashchikh A. I. 《Crystallography Reports》2021,66(7):1206-1215
Crystallography Reports - The orientation of grains and the special boundaries formed by them in multicrystalline silicon has been studied by electron backscattered diffraction. It is found that... 相似文献
150.
Crystallography Reports - Some questions related to the establishment, development, and prospects of physical studies using inelastic thermal-neutron scattering are briefly reviewed. The directions... 相似文献