全文获取类型
收费全文 | 11907篇 |
免费 | 312篇 |
国内免费 | 29篇 |
专业分类
化学 | 8531篇 |
晶体学 | 100篇 |
力学 | 128篇 |
数学 | 1544篇 |
物理学 | 1945篇 |
出版年
2020年 | 112篇 |
2019年 | 108篇 |
2016年 | 204篇 |
2015年 | 212篇 |
2014年 | 183篇 |
2013年 | 396篇 |
2012年 | 378篇 |
2011年 | 486篇 |
2010年 | 292篇 |
2009年 | 274篇 |
2008年 | 435篇 |
2007年 | 434篇 |
2006年 | 409篇 |
2005年 | 445篇 |
2004年 | 414篇 |
2003年 | 356篇 |
2002年 | 319篇 |
2001年 | 225篇 |
2000年 | 216篇 |
1999年 | 169篇 |
1998年 | 150篇 |
1997年 | 172篇 |
1996年 | 214篇 |
1995年 | 186篇 |
1994年 | 193篇 |
1993年 | 184篇 |
1992年 | 170篇 |
1991年 | 164篇 |
1990年 | 142篇 |
1989年 | 155篇 |
1988年 | 169篇 |
1987年 | 169篇 |
1986年 | 168篇 |
1985年 | 196篇 |
1984年 | 170篇 |
1983年 | 157篇 |
1982年 | 164篇 |
1981年 | 160篇 |
1980年 | 149篇 |
1979年 | 142篇 |
1978年 | 139篇 |
1977年 | 141篇 |
1976年 | 140篇 |
1975年 | 119篇 |
1974年 | 152篇 |
1973年 | 128篇 |
1961年 | 145篇 |
1960年 | 204篇 |
1959年 | 111篇 |
1958年 | 120篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
W. D. Treadwell A. Köhl Herzfeld R. J. Meyer 《Analytical and bioanalytical chemistry》1926,69(9):352-357
982.
K. Heller und K. Meyer 《Fresenius' Journal of Analytical Chemistry》1927,71(3-4):117-122
Ohne Zusammenfassung 相似文献
983.
The rapid development of high-speed trains like the TGV or the ICE in recent years results in high dynamic loads causing vibrations which propagate from the train-track structure into the ground and further into nearby buildings. In this context it is important to develop rigid tracks with improved dynamic behaviour and to investigate possible means of vibration reduction. The boundary element method in frequency and time domain is used to simulate train-track structures subjected to dynamic loading and the reduction of vibrations which for instance can be achieved via a trench running parallel to the rigid track. In this context the non-causality error, which arises when the time-domain BEM algorithm is applied to mathematically concave domains, is discussed and the substructure method is proposed as a solution to this problem. A two-layered cylindrical elastic structure on a half-space with a trench is added as an example of a possible application. 相似文献
984.
Ohne Zusammenfassung 相似文献
985.
D. Meyer W. Nolting 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,18(3):385-395
We compare different approximation schemes for investigating ferromagnetism in the periodic Anderson model. The use of several
approximations allows for a detailed analysis of the implications of the respective methods, and also of the mechanisms driving
the ferromagnetic transition. For the Kondo limit, our results confirm a previously proposed mechanism leading to ferromagnetic
order, namely an RKKY exchange mediated via the formation of Kondo screening clouds in the conduction band. The contrary case is found in the intermediate-valence regime.
Here, the bandshift correction ensuring a correct high-energy expansion of the self-energy is essential. Inclusion of damping
effects reduces stability of the ferromagnetic phase.
Received 5 June 2000 and Received in final form 3 August 2000 相似文献
986.
987.
988.
989.
Six different calixarene-bonded phases were characterized by analyzing 36 and 26 solutes at pH 3 and 7, respectively. Dolan and Snyder's multiple term linear equation was used to correlate retention factors k' to parameters of the solutes and columns. The column parameters have been related to molecular properties of the stationary phases and new suggestions were made for the interpretation of steric selectivity. Ionic and polar interactions have been found dependent on pH value, while steric interactions are less dependent and hydrophobic interactions remain unchanged. Distinct differences of the supported interactions were confirmed between the calixarene-bonded and the common alkyl-bonded silicas. By use of the parameters, values of k' can be estimated with an average deviation of 2.50 and 7.92% at low and neutral pH-value, respectively. 相似文献
990.