全文获取类型
收费全文 | 706篇 |
免费 | 14篇 |
国内免费 | 1篇 |
专业分类
化学 | 575篇 |
晶体学 | 6篇 |
力学 | 2篇 |
数学 | 27篇 |
物理学 | 111篇 |
出版年
2020年 | 5篇 |
2019年 | 10篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 8篇 |
2015年 | 6篇 |
2014年 | 7篇 |
2013年 | 41篇 |
2012年 | 38篇 |
2011年 | 40篇 |
2010年 | 33篇 |
2009年 | 19篇 |
2008年 | 46篇 |
2007年 | 45篇 |
2006年 | 34篇 |
2005年 | 42篇 |
2004年 | 40篇 |
2003年 | 31篇 |
2002年 | 46篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 12篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1987年 | 4篇 |
1985年 | 7篇 |
1984年 | 16篇 |
1982年 | 9篇 |
1981年 | 10篇 |
1980年 | 5篇 |
1979年 | 17篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1974年 | 7篇 |
1973年 | 9篇 |
1972年 | 10篇 |
1971年 | 7篇 |
1970年 | 9篇 |
1969年 | 5篇 |
1967年 | 8篇 |
1966年 | 7篇 |
1965年 | 4篇 |
排序方式: 共有721条查询结果,搜索用时 15 毫秒
71.
72.
Yoshida T Nishi I Ideta S Fujimori A Kubota M Ono K Kasahara S Shibauchi T Terashima T Matsuda Y Ikeda H Arita R 《Physical review letters》2011,106(11):117001
We have studied the three-dimensional shapes of the Fermi surfaces (FSs) of BaFe(2)(As(1-x)P(x))(2) (x=0.38), where superconductivity is induced by isovalent P substitution and by angle-resolved photoemission spectroscopy. Moderately strong electron mass enhancement has been identified for both the electron and hole FSs. Among two observed hole FSs, the nearly two-dimensional one shows good nesting with the outer two-dimensional electron FS, but its orbital character is different from the outer electron FS. The three-dimensional hole FS shows poor nesting with the electron FSs. The present results suggest that the three dimensionality and the difference in the orbital character weaken FS nesting while partial nesting among the outer electron FSs of d(xy) character and/or that within the three-dimensional hole FS becomes dominant, which may lead to the nodal superconductivity. 相似文献
73.
We study the effects of noise intensity fluctuations on the stationary and dynamical properties of an overdamped Langevin model with a bistable potential and external periodical driving force. We calculated the stationary distributions, mean-first passage time (MFPT) and the spectral amplification factor using a complete set expansion (CSE) technique. We found resonant activation (RA) and stochastic resonance (SR) phenomena in the system under investigation. Moreover, the strength of RA and SR phenomena exhibit non-monotonic behavior and their trade-off relation as a function of the squared variation coefficient of the noise intensity process. The reliability of CSE is verified with Monte Carlo simulations. 相似文献
74.
Tsunewaki K 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2011,87(8):529-549
A homology search of wheat chloroplast (ct) and mitochondrial (mt) genomes identified 54 ctDNA segments that have homology with 66 mtDNA segments. The mtDNA segments were classified according to their origin: orthologs (prokaryotic origin), xenologs (interorganellar DNA transfer origin) and paralogs (intraorganellar DNA amplification origin). The 66 mtDNA sequences with homology to ctDNA segments included 14 paralogs, 18 orthologs and 34 xenologs. Analysis of the xenologs indicated that the DNA transfer occurred unidirectionally from the ct genome to the mt genome. The evolutionary timing of each interorganellar DNA transfer that generated a xenolog was estimated. This analysis showed that 2 xenologs originated early in green plant evolution, 4 in angiosperm evolution, 3 in monocotyledon evolution, 9 during cereal diversification and 8 in the evolution of wheat. Six other xenologs showed recurrent transfer from the ct to mt genomes in more than one taxon. The two remaining xenologs were uninformative on the evolutionary timing of their transfer. The wheat mt nad9 gene was found to be chimeric, consisting of the cereal nad9 gene and its 291 bp 5'-flanking region that included a 58 bp xenolog of the ct-ndhC origin. 相似文献
75.
Radical additions of S-thiophosphinyl dithiocarbonate to terminal aromatic alkynes afford (E)-1-aryl-1-thio-2-thiophosphinylethene derivatives regio- and stereoselectively in high yields. The transformations of the products are also described. 相似文献
76.
Koichiro Ohtake 《代数通讯》2013,41(15):1533-1540
77.
78.
79.
80.