全文获取类型
收费全文 | 121篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
化学 | 34篇 |
晶体学 | 1篇 |
数学 | 27篇 |
物理学 | 62篇 |
出版年
2022年 | 1篇 |
2020年 | 3篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2012年 | 2篇 |
2011年 | 1篇 |
2010年 | 5篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 3篇 |
2005年 | 6篇 |
2004年 | 4篇 |
2003年 | 7篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 12篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1990年 | 2篇 |
1988年 | 5篇 |
1986年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 5篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1971年 | 1篇 |
1970年 | 2篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1933年 | 1篇 |
1932年 | 1篇 |
1930年 | 1篇 |
1929年 | 3篇 |
1928年 | 3篇 |
排序方式: 共有124条查询结果,搜索用时 15 毫秒
1.
2.
3.
Martinez-Diaz MV Rodriguez-Morgade MS Feiters MC van Kan PJ Nolte RJ Stoddart JF Torres T 《Organic letters》2000,2(8):1057-1060
[formula: see text] New unsymmetrically substituted DB24C8-phthalocyanines, which are able to form complexes with suitable dialkylammonium cations, have been prepared. These complexes most probably have a pseudorotaxane geometry. 相似文献
4.
Schupp PJ Charlton TS Taylor MW Kjelleberg S Steinberg PD 《Analytical and bioanalytical chemistry》2005,383(1):132-137
A challenge for understanding the role of bacterial cell–cell signalling in the environment is the detection of those signals,
which are often present in low (nmol L−1) concentrations. We describe here a simple purification method, solid-phase extraction (SPE), for increasing the sensitivity
of detection for one such group of signals, acyl homoserine lactones (AHLs), in environmental samples. Spiking of dried marine
sponge tissue (Stylinos sp.) with AHLs resulted in detection down to 0.01 ppm for 3-oxo-hexanoyl homoserine lactone (3-oxo C6-HSL) and 1 ppm for hexanoyl homoserine lactone (C6-HSL). Compared with liquid extraction methods use of SPE resulted in twofold and tenfold improvements in sensitivity, respectively. 相似文献
5.
6.
The intramolecular and long-range ferromagnetic coupling between p-phenylenediamine radical cations in head-to-tail coupled oligo(1, 4-phenyleneethynylene)s and oligo(1,4-phenylenvinylene)s between neighbors and next-nearest neighbors is described. UV/vis/near-IR experiments show that the radical cations are localized in the pendant p-phenylenediamine units of the conjugated oligomers. The ESR spectra of these oligo(1,4-phenyleneethynylene) and oligo(1, 4-phenylenvinylene) di(radical cation)s are consistent with those of a triplet state. A linear behavior is observed for the doubly integrated ESR intensity of the DeltaM(s) = +/-1 and DeltaM(s) = +/-2 signals with the inverse temperature (I approximately 1/T), consistent with Curie's law. This behavior indicates a triplet ground-state diradical with a large triplet-singlet energy gap or possibly a degeneracy of singlet and triplet states. 相似文献
7.
B. Melić K. Passek-Kumerički J. Trampetić P. Schupp M. Wohlgenannt 《The European Physical Journal C - Particles and Fields》2005,42(4):499-504
This paper is a direct extension of our earlier work on electroweak currents and the Higgs sector in the standard model on non-commutative space-time, now with strong interactions included. Apart from the non-commutative corrections to standard model strong interactions, several new interactions appear. The most interesting ones are gluonic interactions with the electroweak sector. They are elaborated here in detail and the Feynman rules for interactions up to
are provided.Received: 18 March 2005, Revised: 13 May 2005, Published online: 19 July 2005 相似文献
8.
P. Schupp J. Trampetić G. Raffelt 《The European Physical Journal C - Particles and Fields》2004,36(3):405-410
In this work we propose a possible mechanism of left- and right-handed neutrino couplings to photons, which arises quite naturally in non-commutative field theory. We estimate the predicted additional energy-loss in stars induced by space-time non-commutativity. The usual requirement that any new energy-loss mechanism in globular stellar clusters should not excessively exceed the standard neutrino losses implies a scale of non-commutative gauge theory above the scale of weak interactions.Received: 2 April 2004, Published online: 14 July 2004 相似文献
9.
Lantz MA Hug HJ van Schendel PJ Hoffmann R Martin S Baratoff A Abdurixit A Guntherodt H Gerber C 《Physical review letters》2000,84(12):2642-2645
A low temperature scanning force microscope (SFM) operating in a dynamic mode in ultrahigh vacuum was used to study the Si(111)- (7x7) surface at 7.2 K. Not only the twelve adatoms but also the six rest atoms of the unit cell are clearly resolved for the first time with SFM. In addition, the first measurements of the short range chemical bonding forces above specific atomic sites are presented. The data are in good agreement with first principles computations and indicate that the nearest atoms in the tip and sample relax significantly when the tip is within a few A of the surface. 相似文献
10.
The algebra dual to Woronowicz's deformation of the two-dimensional Euclidean group is constructed. The same algebra is obtained from SU
q
(2) via contraction on both the group and algebra levels. 相似文献