全文获取类型
收费全文 | 1519篇 |
免费 | 20篇 |
国内免费 | 9篇 |
专业分类
化学 | 827篇 |
晶体学 | 7篇 |
力学 | 57篇 |
数学 | 227篇 |
物理学 | 430篇 |
出版年
2020年 | 20篇 |
2016年 | 20篇 |
2015年 | 16篇 |
2014年 | 22篇 |
2013年 | 55篇 |
2012年 | 53篇 |
2011年 | 56篇 |
2010年 | 37篇 |
2009年 | 37篇 |
2008年 | 56篇 |
2007年 | 46篇 |
2006年 | 55篇 |
2005年 | 47篇 |
2004年 | 40篇 |
2003年 | 39篇 |
2002年 | 51篇 |
2001年 | 26篇 |
2000年 | 28篇 |
1999年 | 29篇 |
1998年 | 14篇 |
1997年 | 14篇 |
1996年 | 20篇 |
1995年 | 26篇 |
1994年 | 12篇 |
1993年 | 38篇 |
1992年 | 18篇 |
1991年 | 28篇 |
1990年 | 22篇 |
1989年 | 20篇 |
1988年 | 14篇 |
1987年 | 24篇 |
1986年 | 15篇 |
1985年 | 20篇 |
1984年 | 21篇 |
1983年 | 12篇 |
1982年 | 15篇 |
1981年 | 20篇 |
1980年 | 19篇 |
1978年 | 20篇 |
1977年 | 31篇 |
1976年 | 19篇 |
1975年 | 16篇 |
1974年 | 14篇 |
1973年 | 15篇 |
1971年 | 18篇 |
1970年 | 12篇 |
1968年 | 18篇 |
1967年 | 15篇 |
1966年 | 15篇 |
1931年 | 12篇 |
排序方式: 共有1548条查询结果,搜索用时 31 毫秒
21.
P. Ackerbauer W. H. Breunlich M. Fuchs S. Fussy M. Jeitler P. Kammel B. Lauss J. Marton W. Prymas J. Werner J. Zmeskal K. Lou C. Petitjean P. Baumann H. Daniel F. J. Hartmann W. Schott T. von Egidy P. Wojciechowski D. Chatellard J. P. Egger E. Jeannet T. Case K. M. Crowe R. H. Sherman V. Markushin 《Hyperfine Interactions》1993,82(1-4):243-258
Complementary to the investigations of the most efficient dt cycle, also the other muon-induced fusion cycles in mixtures of hydrogen isotopes have been studied. The results of these dedicated experiments provide rich information about muon-induced few-body reactions and contribute significantly to a better overall understanding of CF. A summary of the recent progress will be presented. Special emphasis will be put on two characteristic examples, namely a new experimental approach to study the muonic cascade in H-D mixtures and the systematic study of hyperfine effects in muon-induced reactions. 相似文献
22.
23.
24.
25.
26.
Martin Fuchs 《manuscripta mathematica》1985,54(1-2):107-119
We minimize the Dirichlet-integral in a class of vector-valued functions u:N defined by Dirichlet-boundary conditions and a side-condition of the form u()M with M bounded and open in N having smooth boundary M. If the boundary values are sufficiently regular we show that the minimizer can only have interior singularities, i.e. the solution is smooth in a neighborhood of . 相似文献
27.
28.
Zou B Wang M Qiu D Zhang X Chi L Fuchs H 《Chemical communications (Cambridge, England)》2002,(9):1008-1009
Stable surface nanostructures with different morphology have been successfully constructed by modifying the chemical structure of synthetic amphiphiles; by introducing mesogenic groups into bolaform amphiphiles, stable spaghetti-like or stripe-like nanostructures can be obtained; it is believed that such a kind of surface structure could be used for templating synthesis and assembly. 相似文献
29.
Goujon F Malfreyt P Simon JM Boutin A Rousseau B Fuchs AH 《The Journal of chemical physics》2004,121(24):12559-12571
The Monte Carlo (MC) and molecular dynamics (MD) methodologies are now well established for computing equilibrium properties in homogeneous fluids. This is not yet the case for the direct simulation of two-phase systems, which exhibit nonuniformity of the density distribution across the interface. We have performed direct MC and MD simulations of the liquid-gas interface of n-pentane using a standard force-field model. We obtained density and pressure components profiles along the direction normal to the interface that can be very different, depending on the truncation and long range correction strategies. We discuss the influence on predicted properties of different potential truncation schemes implemented in both MC and MD simulations. We show that the MD and MC profiles can be made in agreement by using a Lennard-Jones potential truncated via a polynomial function that makes the first and second derivatives of the potential continuous at the cutoff distance. In this case however, the predicted thermodynamic properties (phase envelope, surface tension) deviate from experiments, because of the changes made in the potential. A further readjustment of the potential parameters is needed if one wants to use this method. We conclude that a straightforward use of bulk phase force fields in MD simulations may lead to some physical inconsistencies when computing interfacial properties. 相似文献
30.
Kasher R Balass M Scherf T Fridkin M Fuchs S Katchalski-Katzir E 《Chemistry & biology》2001,8(2):147-155
BACKGROUND: Alpha-bungarotoxin (alpha-BTX) is a highly toxic snake venom alpha-neurotoxin that binds to acetylcholine receptor (AChR) at the neuromuscular junction, and is a potent inhibitor of this receptor. We describe the design and synthesis of peptides that bind alpha-BTX with high affinity, and inhibit its interaction with AChR with an IC(50) of 2 nM. The design of these peptides was based on a lead peptide with an IC(50) of 3x10(-7) M, previously identified by us [M. Balass et al., Proc. Natl. Acad. Sci. USA 94 (1997) 6054] using a phage-display peptide library. RESULTS: Employing nuclear magnetic resonance-derived structural information [T. Scherf et al., Proc. Natl. Acad. Sci. USA 94 (1997) 6059] of the complex of alpha-BTX with the lead peptide, as well as structure-function analysis of the ligand-binding site of AChR, a systematic residue replacement of the lead peptide, one position at a time, yielded 45 different 13-mer peptides. Of these, two peptides exhibited a one order of magnitude increase in inhibitory potency in comparison to the lead peptide. The design of additional peptides, with two or three replacements, resulted in peptides that exhibited a further increase in inhibitory potency (IC(50) values of 2 nM), that is more than two orders of magnitude better than that of the original lead peptide, and better than that of any known peptide derived from AChR sequence. The high affinity peptides had a protective effect on mice against alpha-BTX lethality. CONCLUSIONS: Synthetic peptides with high affinity to alpha-BTX may be used as potential lead compounds for developing effective antidotes against alpha-BTX poisoning. Moreover, the procedure employed in this study may serve as a general approach for the design and synthesis of peptides that interact with high affinity with any desired biological target. 相似文献