全文获取类型
收费全文 | 1451篇 |
免费 | 37篇 |
国内免费 | 5篇 |
专业分类
化学 | 1099篇 |
晶体学 | 20篇 |
力学 | 11篇 |
数学 | 91篇 |
物理学 | 272篇 |
出版年
2023年 | 8篇 |
2021年 | 11篇 |
2020年 | 28篇 |
2019年 | 25篇 |
2018年 | 15篇 |
2017年 | 11篇 |
2016年 | 29篇 |
2015年 | 21篇 |
2014年 | 27篇 |
2013年 | 62篇 |
2012年 | 63篇 |
2011年 | 67篇 |
2010年 | 34篇 |
2009年 | 47篇 |
2008年 | 70篇 |
2007年 | 89篇 |
2006年 | 99篇 |
2005年 | 91篇 |
2004年 | 63篇 |
2003年 | 71篇 |
2002年 | 56篇 |
2001年 | 36篇 |
2000年 | 37篇 |
1999年 | 24篇 |
1998年 | 11篇 |
1997年 | 15篇 |
1996年 | 19篇 |
1995年 | 24篇 |
1994年 | 15篇 |
1993年 | 9篇 |
1992年 | 23篇 |
1991年 | 13篇 |
1990年 | 19篇 |
1989年 | 15篇 |
1988年 | 17篇 |
1987年 | 15篇 |
1986年 | 12篇 |
1985年 | 13篇 |
1984年 | 18篇 |
1983年 | 9篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1980年 | 6篇 |
1979年 | 18篇 |
1978年 | 23篇 |
1977年 | 21篇 |
1976年 | 7篇 |
1975年 | 9篇 |
1974年 | 9篇 |
1973年 | 10篇 |
排序方式: 共有1493条查询结果,搜索用时 281 毫秒
1.
J. Fujimoto T. Ishikawa M. Jimbo T. Kaneko T. Kon Y. Kurihara M. Kuroda Y. Shimizu Y. Yasui 《Pramana》2007,69(5):943-946
We report the recent development on the SUSY calculations with the help of GRACE system. GRACE/SUSY/1LOOP is the computer
code which can generate Feynman diagrams in the MSSM automatically and compute one-loop amplitudes in the numerical way. We
present new results of various two-body decay widths and chargino pair production at ILC (international linear collider) at
one-loop level.
相似文献
2.
Modular and quasimodular solutions of a specific second order differential equation in the upper-half plane, which originates from a study of supersingular j-invariants in the first author's work with Don Zagier, are given explicitly. Positivity of Fourier coefficients of some of the solutions as well as a characterization of the differential equation are also discussed. 相似文献
3.
Masanobu Haraguchi David F. P. Pile Toshihiro Okamoto Masuo Fukui Dmitri K. Gramotnev 《Optical Review》2006,13(4):228-230
We have numerically shown the existence of coupled wedge plasmons (CWPs) which propagates along a nano gap of a twin metal
wedge. The CWPs are formed by wedge plasmons which can interact with each other. The dispersion relations of the wavenumber,
propagation distance, and beam area of CWPs, are described and show that the characteristics of CWPs are similar to those
of wedge plasmons and of gap plasmons. We also propose a new plasmon waveguide composed of twin metal wedges with a nano gap. 相似文献
4.
We present the spot size dependence of dielectric multilayer filters for use in dense WDM systems. We found large dependences of filter performances on the spot size and the incident angle of input light, which should be important for miniaturizing multi-channel add/drop filters. 相似文献
5.
6.
7.
It is shown that if in a simple graph G of order n the sum of degrees of any three pairwise non-adjacent vertices is at least n, then there are two cycles (or one cycle and an edge or a vertex) of GF that contain all the vertices. © 1995 John Wiley & Sons, Inc. 相似文献
8.
A side-chain liquid crystalline polysiloxane derivative possessing mesogens was synthesized. The mesogens included a large dielectrically-anisotropic moiety. Phase transition behaviour was investigated and the electrorheological (ER) effect of the polymer considered. No ER effect was observed in non-sheared polysiloxane derivative because of its high inherent viscosity. However, a large ER effect was observed after pre-shearing. Pre-shearing, i.e. shearing with a high shear rate before the measurements, arranges the terminal mesogens in the shearing direction. Furthermore, a dilution of the sample led to a larger ER effect exceeding 10 000 Pa. We thus were able to demonstrate a new approach for the appearance of the ER effect. 相似文献
9.
10.
D. Kaneko T. Narita J. P. Gong Y. Osada J. Ando K. Yamamoto S. Ohnishi V. V. Yaminsky 《Journal of Polymer Science.Polymer Physics》2003,41(22):2808-2815
The effect of the shear flow on the thickness change of a polyelectrolyte membrane grafted onto a glass substrate was directly investigated with a flow cell combined with a confocal laser scanning microscope. The membrane thickness decreased proportionally to an increase in the shear stress of the flow when the shear rate exceeded a critical value of 1 s?1. The higher the ionic strength was of the fluid, the greater the thinning effect was. The correlation between the critical shear rate and the relaxation of the polymer in the gel membrane was examined. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 2808–2815, 2003 相似文献