全文获取类型
收费全文 | 641篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
化学 | 278篇 |
晶体学 | 6篇 |
力学 | 40篇 |
数学 | 150篇 |
物理学 | 178篇 |
出版年
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2016年 | 3篇 |
2015年 | 11篇 |
2014年 | 8篇 |
2013年 | 25篇 |
2012年 | 22篇 |
2011年 | 29篇 |
2010年 | 9篇 |
2009年 | 15篇 |
2008年 | 28篇 |
2007年 | 32篇 |
2006年 | 33篇 |
2005年 | 34篇 |
2004年 | 22篇 |
2003年 | 15篇 |
2002年 | 9篇 |
2001年 | 17篇 |
2000年 | 11篇 |
1999年 | 13篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 12篇 |
1994年 | 25篇 |
1993年 | 22篇 |
1992年 | 18篇 |
1991年 | 10篇 |
1990年 | 5篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 12篇 |
1984年 | 8篇 |
1983年 | 11篇 |
1982年 | 9篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 10篇 |
1978年 | 6篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1975年 | 11篇 |
1974年 | 6篇 |
1973年 | 8篇 |
1968年 | 5篇 |
1907年 | 4篇 |
排序方式: 共有652条查询结果,搜索用时 15 毫秒
81.
In this paper we are concerned with the development of criteria for stabilizing inherently unstable initial-boundary value problems under small errors in the geometry of the underlying domain. We consider in particular the initial-boundary-value problem for the backward heat equation assuming that some error has been made in characterizing the geometry of the domain under consideration. It is shown that solutions which belong to an appropriately defined constraint set depend continuously in L2 on errors in the geometry. 相似文献
82.
83.
84.
85.
86.
R. Payne R.J. Magee J. Liesegang 《Journal of Electron Spectroscopy and Related Phenomena》1985,35(1):113-130
Measurements are presented for the binding energy variations of (a) (Ni, Cu) 2p, S 2p and N 1s core levels in a series of Ni and Cu disubstituted dithiocarbamates and (b) (Ni, Cu) 2p, and S 2p core levels in a series of Ni xanthates. These shifts, which are observed to be negative and quite large for the S 2p levels, are then correlated with the infrared absorption frequency variations for the associated intramolecular stretching vibrations of the same series. The results are interpreted in terms of a model based on atomic charges and their potential effects on both variations. The functional relationships between the binding energy and infrared frequency variations are shown to be in good agreement with the experimental results. 相似文献
87.
Some aspects of the theory of superconductors in noninertial frames are clarified. Interference effects, such as that observed by Zimmerman and Mercereau on rotation of a SQUID, would be destroyed if the apparatus were shielded by a superconducting shell. 相似文献
88.
89.
90.
We have extended our functionalization strategy for pentacene to the higher acenes hexacene and heptacene. Provided a large enough alkyne substituent is used, these large aromatic rods are both stable and soluble and can be characterized spectroscopically as well as by single-crystal X-ray diffraction. 相似文献