首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   539篇
  免费   9篇
  国内免费   9篇
化学   247篇
晶体学   1篇
力学   30篇
数学   102篇
物理学   177篇
  2022年   5篇
  2021年   9篇
  2020年   7篇
  2019年   9篇
  2018年   11篇
  2017年   13篇
  2016年   16篇
  2015年   10篇
  2014年   13篇
  2013年   28篇
  2012年   22篇
  2011年   30篇
  2010年   10篇
  2009年   16篇
  2008年   30篇
  2007年   15篇
  2006年   24篇
  2005年   28篇
  2004年   24篇
  2003年   20篇
  2002年   18篇
  2001年   21篇
  2000年   13篇
  1999年   6篇
  1998年   11篇
  1997年   8篇
  1996年   6篇
  1995年   11篇
  1994年   5篇
  1993年   4篇
  1992年   8篇
  1991年   10篇
  1990年   6篇
  1988年   5篇
  1985年   6篇
  1984年   9篇
  1982年   7篇
  1981年   5篇
  1980年   2篇
  1979年   3篇
  1978年   3篇
  1977年   7篇
  1976年   5篇
  1975年   6篇
  1974年   9篇
  1973年   4篇
  1971年   4篇
  1970年   2篇
  1968年   2篇
  1967年   2篇
排序方式: 共有557条查询结果,搜索用时 15 毫秒
1.
In the present paper, the notion of norm series with respect to the norm residue symbol is generalized to high-dimensional local fields. Necessary and sufficient conditions for the existence of norm series are obtained. Bibliography: 12 titles.__________Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 305, 2003, pp. 60–83.  相似文献   
2.
We consider a three-dimensional bicovariant differential calculus on the quantum group SUq(2) that is compatible with the structure of gauge transformations. In the approach based on the global covariance with respect to the stability subgroup U(1), we show that the gauge-covariant exterior differential algebra on SUq(2) is uniquely determined. We construct explicit representations of q-deformed Lie algebras in terms of differential operators. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 116, No. 2, pp. 265–276, August. 1998.  相似文献   
3.
4.
The angular distributions of the (p, d), (d, t) and(3He, ) reactions on13C have been analysed within the framework of DWBA in which additional information on nuclear vertex constants was introduced. Although all these reactions seem to be similar single nucleon transfer, their mechanism is shown to be quite different and so is the information extracted thereof. While from the (p, d) reactions spectroscopic factors may be extracted unambiguously, from the (d, t) reactions it is possible to obtain directly the values of vertex constants only, which in turn are consistent with those determined by extrapolation of the experimental cross sections of the (p, d) reactions to the pole.In the case of (3He, ) reactions, however, the analysis indicates inadequacy of the DWBA concerning the calculations of central partial amplitudes. For a more reliable extraction of structural information, besides the correct normalization of peripheral amplitudes, a contribution of more complex mechanisms must be taken into account.  相似文献   
5.
6.
7.
Inorganic arsenic was separated using the yeast-immobilized column. Saccharomyces cerevisiae was covalently bonded unto the controlled pore glass, which showed selective preconcentration of As5+ over As3+. The effluent was directly connected to hydride generation (HG) to increase sensitivity. The optimum pH condition for the retainment of arsenic at the column was 7. As5+ and As3+ were completely separated in a few minutes with the flow rate of 1.5 ml min−1. Three molars of nitric acid was adequate both for the elution of As5+ and hydride generation. The accuracy of the technique was tested with NIST SRMs. Quantitative analysis of arsenic species for herbicide, pesticide, and cigarette were performed, and the results showed good agreements with the suggested values. Yeast-immobilized column-HG-ICP showed a promising future for the arsenic speciation study.  相似文献   
8.
A vancomycin (Van) derivative self-assembles in a phosphate buffer as a divalent Van and on cell surfaces as a multivalent Van, which offers potent activity against VRE.  相似文献   
9.
10.
Ab initio calculations are reported for the simplest heteronuclear metal cluster, LiBe. Full spin-orbit configuration interaction calculations in the context of relativistic effective core potentials lead to accurate potential energy curves for low-lying states. Results are compared with recent experimental observations and with all electron multi-reference configuration interaction calculations.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号