全文获取类型
收费全文 | 702461篇 |
免费 | 6403篇 |
国内免费 | 2057篇 |
专业分类
化学 | 343105篇 |
晶体学 | 10120篇 |
力学 | 37138篇 |
综合类 | 19篇 |
数学 | 112538篇 |
物理学 | 208001篇 |
出版年
2021年 | 5675篇 |
2020年 | 6228篇 |
2019年 | 7057篇 |
2018年 | 18994篇 |
2017年 | 18902篇 |
2016年 | 18917篇 |
2015年 | 8122篇 |
2014年 | 12497篇 |
2013年 | 28719篇 |
2012年 | 25155篇 |
2011年 | 35413篇 |
2010年 | 24416篇 |
2009年 | 24748篇 |
2008年 | 30431篇 |
2007年 | 32173篇 |
2006年 | 22484篇 |
2005年 | 21023篇 |
2004年 | 19853篇 |
2003年 | 18498篇 |
2002年 | 17417篇 |
2001年 | 17921篇 |
2000年 | 13950篇 |
1999年 | 10713篇 |
1998年 | 9271篇 |
1997年 | 9072篇 |
1996年 | 8573篇 |
1995年 | 7720篇 |
1994年 | 7642篇 |
1993年 | 7378篇 |
1992年 | 7908篇 |
1991年 | 8292篇 |
1990年 | 7931篇 |
1989年 | 7844篇 |
1988年 | 7640篇 |
1987年 | 7475篇 |
1986年 | 7142篇 |
1985年 | 9145篇 |
1984年 | 9525篇 |
1983年 | 8104篇 |
1982年 | 8496篇 |
1981年 | 7880篇 |
1980年 | 7536篇 |
1979年 | 8129篇 |
1978年 | 8384篇 |
1977年 | 8218篇 |
1976年 | 8160篇 |
1975年 | 7846篇 |
1974年 | 7686篇 |
1973年 | 8105篇 |
1972年 | 5773篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
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
82.
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
83.
Crystallography Reports - Methods of coherent X-ray diffraction imaging of the spatial structure of noncrystalline objects and nanocrystals (nanostructures) are considered. Particular attention is... 相似文献
84.
Satyanarayana A. V. S. Rao M. Jagannadha Mouli K. Chandra 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(3):1509-1513
Journal of Radioanalytical and Nuclear Chemistry - 相似文献
85.
Sun Guo-Hua Dong Qian Bezerra V. B. Dong Shi-Hai 《Journal of mathematical chemistry》2022,60(4):605-612
Journal of Mathematical Chemistry - The analytical solutions of an asymmetric double well potential $$V(x)=a\, x^2-b\, x^3+c\, x^4$$ are found to be a triconfluent Heun function $$H_{T}(\alpha ,... 相似文献
86.
Russian Physics Journal - The paper shows that the values of zero-point energy and vibrations of atoms in a crystal determined by the uncertainty principle, depend on the dynamic response of atoms.... 相似文献
87.
Journal of Applied and Industrial Mathematics - We study the problem of optimal location of the ambulance fleet at the base stations. The objective is to minimize the average waiting time for... 相似文献
88.
89.
A liquid dewetting method for the determination of the viscoelastic properties of ultrathin polymer films has been extended to study thickness effects on the properties of ultrathin polycarbonate (PC) films. PC films with film thicknesses ranging from 4 to 299 nm were placed on glycerol at temperatures from below the macroscopic glass transition temperature (Tg) to above it with the dewetting responses being monitored. It is found that the isothermal creep results for films of the same thickness, but dewetted at different temperatures can be superposed into one master curve, which is consistent with the fact of PC being a thermorheologically simple material. Furthermore, the results show that the Tg of PC thin films is thickness dependent, but the dependence is weaker than the results for freely standing films and similar to literature data for PC films supported on rigid substrates. It was also found that the rubbery plateau region for the PC films stiffens dramatically, but still less than what has been observed for freely standing polycarbonate films. The rubbery stiffening is discussed in terms of a recently reported model that relates macroscopic segmental dynamics with the stiffening. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 1559–1566 相似文献
90.