全文获取类型
收费全文 | 1609篇 |
免费 | 35篇 |
国内免费 | 7篇 |
专业分类
化学 | 1262篇 |
晶体学 | 18篇 |
力学 | 22篇 |
数学 | 131篇 |
物理学 | 218篇 |
出版年
2023年 | 10篇 |
2021年 | 12篇 |
2020年 | 15篇 |
2019年 | 9篇 |
2018年 | 17篇 |
2017年 | 9篇 |
2016年 | 29篇 |
2015年 | 29篇 |
2014年 | 33篇 |
2013年 | 98篇 |
2012年 | 83篇 |
2011年 | 114篇 |
2010年 | 55篇 |
2009年 | 69篇 |
2008年 | 70篇 |
2007年 | 77篇 |
2006年 | 105篇 |
2005年 | 77篇 |
2004年 | 78篇 |
2003年 | 64篇 |
2002年 | 69篇 |
2001年 | 22篇 |
2000年 | 33篇 |
1999年 | 26篇 |
1998年 | 23篇 |
1997年 | 23篇 |
1996年 | 20篇 |
1995年 | 15篇 |
1994年 | 23篇 |
1993年 | 16篇 |
1992年 | 14篇 |
1991年 | 16篇 |
1990年 | 16篇 |
1989年 | 20篇 |
1988年 | 15篇 |
1987年 | 13篇 |
1985年 | 26篇 |
1984年 | 22篇 |
1983年 | 13篇 |
1982年 | 19篇 |
1981年 | 14篇 |
1980年 | 18篇 |
1979年 | 18篇 |
1978年 | 9篇 |
1977年 | 12篇 |
1976年 | 7篇 |
1974年 | 11篇 |
1973年 | 7篇 |
1971年 | 9篇 |
1968年 | 9篇 |
排序方式: 共有1651条查询结果,搜索用时 250 毫秒
1.
Yukinobu Toda 《Mathematische Annalen》2015,363(1-2):679-699
2.
3.
This work consists of two parts. In Part I, we shall give a systematic study of Lorentz conformal structure from structural viewpoints. We study manifolds with split-complex structure. We apply general results on split-complex structure for the study of Lorentz surfaces.In Part II, we study the conformal realization of Lorentz surfaces in the Minkowski 3-space via conformal minimal immersions. We apply loop group theoretic Weierstrass-type representation of timelike constant mean curvature for timelike minimal surfaces. Classical integral representation formula for timelike minimal surfaces will be recovered from loop group theoretic viewpoint. 相似文献
4.
Toshiyuki Sugawa 《Monatshefte für Mathematik》2003,139(1):61-68
The inner radius of univalence of a domain D with Poincaré density ρ
D
is the possible largest number σ such that the condition ∥ S
f
∥
D
= sup
w∈ D
ρ
D
(w)
−2∥ S
f
(z) ∥ ≤ σ implies univalence of f for a nonconstant meromorphic function f on D, where S
f
is the Schwarzian derivative of f. In this note, we give a lower bound of the inner radius of univalence for strongly starlike domains of order α in terms
of the order α.
The author was partially supported by the Ministry of Education, Grant-in-Aid for Encouragement of Young Scientists, 11740088.
A part of this work was carried out during his visit to the University of Helsinki under the exchange programme of scientists
between the Academy of Finland and the JSPS.
Received November 26, 2001; in revised form September 24, 2002
Published online May 9, 2003 相似文献
5.
6.
We have investigated the photoluminescence (PL) properties of trace amounts of Pr and Tb in single-crystal samples of yttria-stabilized zironia (YSZ), and found that Pr of the order of 10−6 mass% and Tb of the order of 10−5 mass% in YSZ can be detected by the PL spectroscopy. The PL spectra of the YSZ samples for the 280 nm excitation were comprised of several peaks and a broad emission. The peaks were attributed to transitions of Pr3+ and Tb3+ in the YSZ samples, whereas the broad emission seemed to be attributed to the yttria-associated oxygen vacancies. The peak intensities corresponded to the amounts of Pr and Tb in the YSZ samples, the amounts of which were analyzed by glow discharge mass spectrometry. In the PL excitation spectra, but not in the photoabsorption spectra, small peaks at 376 and 381 nm were observed, and were attributed to the transitions of Tb3+ in the YSZ samples. The results of the PL excitation spectra corresponding to the Pr3+ line emissions suggest that the charge transfer occurs between the YSZ and Pr ion in it. The trace amounts of these lanthanoids in YSZ would disturb the decay process of the photoinduced electrons to the yttria-associated oxygen vacancies. 相似文献
7.
Toshiyuki Kuruma 《Zeitschrift fur Physik C Particles and Fields》1993,57(4):551-558
The top quark, once produced, should be an important window to the electroweak symmetry breaking sector. We compute electroweak radiative corrections to the decay processt→b+W + in order to extract information on the Higgs sector and to fix the background in searches for a possible new physics contribution. The large Yukawa coupling of the top quark induces a new form factor through vertex corrections and causes discrepancy from the tree-level longitudinalW-boson production fraction, but the effect is of order 1% or less form H<1 TeV. 相似文献
8.
K. Niume K. Toyofuku F. Toda K. Uno M. Hasegawa Y. Iwakura 《Journal of polymer science. Part A, Polymer chemistry》1982,20(3):663-673
Polybenzimidazoles that contained anthracene photodimer were prepared. The molecular weights of the polymers prepared by the photopolymerization of bis-anthrylbenzimidazoles were limited by the precipitation of the resulting polymers from the reaction organic solvents. Higher molecular weight polymers were obtained by the photopolymerization of bis-anthryl-Schiff's bases, followed by the oxidation of the resulting polymers. These polymers were soluble in acidic solvents such as formic and sulfuric acids but were insoluble in organic solvents. 相似文献
9.
Toshiyuki Kobayashi 《Mathematische Annalen》1989,285(2):249-263
Partially supported by Grant-in-Aid for Scientific Research (No. 63740074) 相似文献
10.