全文获取类型
收费全文 | 276686篇 |
免费 | 19128篇 |
国内免费 | 8058篇 |
专业分类
化学 | 170352篇 |
晶体学 | 3552篇 |
力学 | 14310篇 |
综合类 | 522篇 |
数学 | 30980篇 |
物理学 | 84156篇 |
出版年
2022年 | 2925篇 |
2021年 | 4069篇 |
2020年 | 5305篇 |
2019年 | 6834篇 |
2018年 | 6349篇 |
2017年 | 5968篇 |
2016年 | 9934篇 |
2015年 | 7831篇 |
2014年 | 10037篇 |
2013年 | 15250篇 |
2012年 | 13772篇 |
2011年 | 14303篇 |
2010年 | 11984篇 |
2009年 | 12040篇 |
2008年 | 12495篇 |
2007年 | 11448篇 |
2006年 | 10278篇 |
2005年 | 9316篇 |
2004年 | 8373篇 |
2003年 | 7290篇 |
2002年 | 7923篇 |
2001年 | 7664篇 |
2000年 | 6231篇 |
1999年 | 4683篇 |
1998年 | 3953篇 |
1997年 | 3639篇 |
1996年 | 3476篇 |
1995年 | 3117篇 |
1994年 | 3008篇 |
1993年 | 2904篇 |
1992年 | 2839篇 |
1991年 | 3042篇 |
1990年 | 2869篇 |
1989年 | 2865篇 |
1988年 | 2626篇 |
1987年 | 2642篇 |
1986年 | 2422篇 |
1985年 | 2955篇 |
1984年 | 2872篇 |
1983年 | 2491篇 |
1982年 | 2515篇 |
1981年 | 2385篇 |
1979年 | 2439篇 |
1978年 | 2599篇 |
1977年 | 2689篇 |
1976年 | 2777篇 |
1975年 | 2592篇 |
1974年 | 2516篇 |
1973年 | 2690篇 |
1972年 | 2180篇 |
排序方式: 共有10000条查询结果,搜索用时 812 毫秒
51.
Nonlinear Dynamics - This paper proposes an optimal parameter design of control scheme for mechanical systems by adopting the Stackelberg game theory. The goal of the control is to drive the... 相似文献
52.
Journal of Theoretical Probability - A definition of d-dimensional n-Meixner random vectors is given first. This definition involves the commutators of their semi-quantum operators. After that we... 相似文献
53.
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54.
Dzhun I. O. Babaitsev G. V. Kozin M. G. Romashkina I. L. Shanova E. I. Chechenin N. G. 《Physics of the Solid State》2021,63(6):825-831
Physics of the Solid State - The external factors which influence the ferromagnetic resonance (FMR) line width in bilayer (ferromagnet/antiferromagnet) exchange-biased systems are studied. The... 相似文献
55.
Mathematical Programming - Convergence analysis of accelerated first-order methods for convex optimization problems are developed from the point of view of ordinary differential equation solvers. A... 相似文献
56.
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
57.
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
58.
Avrutskiy V. I. Ishkhanyan A. M. Krainov V. P. 《Theoretical and Mathematical Physics》2021,208(3):1201-1206
Theoretical and Mathematical Physics - The fractional derivative method is used to take wave dispersion into account in the wave equation when describing the propagation of gravitational soliton... 相似文献
59.
Journal of Experimental and Theoretical Physics - This article presents a survey of many nontrivial effects connected with the coupling of electric and magnetic degrees of freedom in... 相似文献
60.
Aequationes mathematicae - For $$p\in (1,\infty )$$ , we establish several criteria of one-sided invertibility on spaces $$l^p=l^p(\mathbb {Z})$$ for discrete band-dominated operators being either... 相似文献