全文获取类型
收费全文 | 1400篇 |
免费 | 9篇 |
国内免费 | 3篇 |
专业分类
化学 | 1056篇 |
晶体学 | 18篇 |
力学 | 38篇 |
数学 | 117篇 |
物理学 | 183篇 |
出版年
2021年 | 9篇 |
2020年 | 5篇 |
2019年 | 11篇 |
2018年 | 14篇 |
2017年 | 6篇 |
2016年 | 13篇 |
2015年 | 18篇 |
2014年 | 16篇 |
2013年 | 72篇 |
2012年 | 35篇 |
2011年 | 67篇 |
2010年 | 35篇 |
2009年 | 39篇 |
2008年 | 60篇 |
2007年 | 68篇 |
2006年 | 61篇 |
2005年 | 66篇 |
2004年 | 58篇 |
2003年 | 69篇 |
2002年 | 70篇 |
2001年 | 49篇 |
2000年 | 30篇 |
1999年 | 20篇 |
1998年 | 17篇 |
1997年 | 18篇 |
1996年 | 17篇 |
1995年 | 22篇 |
1994年 | 21篇 |
1993年 | 13篇 |
1992年 | 22篇 |
1991年 | 23篇 |
1990年 | 19篇 |
1989年 | 19篇 |
1988年 | 14篇 |
1987年 | 15篇 |
1986年 | 22篇 |
1985年 | 20篇 |
1984年 | 36篇 |
1983年 | 9篇 |
1982年 | 23篇 |
1981年 | 18篇 |
1980年 | 26篇 |
1979年 | 30篇 |
1978年 | 23篇 |
1977年 | 11篇 |
1976年 | 15篇 |
1975年 | 18篇 |
1974年 | 10篇 |
1972年 | 9篇 |
1967年 | 4篇 |
排序方式: 共有1412条查询结果,搜索用时 15 毫秒
111.
Masato Hasebe Catherine Lazare Paul de Mayo Alan C. Weedon 《Tetrahedron letters》1981,22(51):5149-5152
Irradiation of a number of aromatic hydrocarbons adsorbed on alumina in the presence of ferric chloride leads to monochlorination. 相似文献
112.
113.
A fluorimetric assay for lecithin-cholesterol acyltransferase in human plasma (normal and pathological) is described. The lowered cholesterol concentration in the enzyme reaction is determined fluorimetrically by using the cholesterol oxidase—peroxidase —tyramine system. The assay requires only 10 μl of plasma. 相似文献
114.
(+)-Sesbanine was effectively synthesized from 4-methylnicotinonitrile and 1-malic acid. 相似文献
115.
Kiyoshi Hasebe Satoshi Hikima Hitoshi Yoshida 《Fresenius' Journal of Analytical Chemistry》1990,336(7):586-588
Summary An electrochemical method for the determination of l-lactic acid using the specific reaction of lactate oxidase, has been studied and applied to lactic acid beverage and yoghurt. The technique is reasonably rapid and simple to perform. The calibration curve is linear in the concentration range from 1.0 to 20 mol/l, the reproducibility (R.S.D.) at 10 mol/l l-lactic acid is 1.34% (n=6) and the detection limit is 0.29 mol/l (k=2). The method can possibly be used for monitoring l-lactate or l-lactic acid in food industries and clinical laboratories. 相似文献
116.
The asymmetric total synthesis of cis, anti, cis-tricyclo[5,3,0,02,6]decane sesquiterpene β-bourbonene is described. The key (2+2) photocycloaddition was carried out applying the optically pure butenolide derivative as a chiral synthon. 相似文献
117.
Hasebe K 《Physical review letters》2005,94(20):206802
Supersymmetric quantum-Hall liquids are constructed on a supersphere in a supermonopole background. We derive a supersymmetric generalization of the Laughlin wave function, which is a ground state of a hard-core OSp(1/2) invariant Hamiltonian. We also present excited topological objects, which are fractionally charged deficits made by super Hall currents. Several relations between quantum-Hall systems and their supersymmetric extensions are discussed. 相似文献
118.
Naruse M Miyazaki T Kubota F Kawazoe T Kobayashi K Sangu S Ohtsu M 《Optics letters》2005,30(2):201-203
A nanoscale data summation architecture is proposed and experimentally demonstrated based on the optical near-field interaction between quantum dots. Based on local electromagnetic interactions between a few nanometric elements via optical near fields, we can combine multiple excitations at a certain quantum dot, which allows construction of a summation architecture. Summation plays a key role for content-addressable memory, which is one of the most important functions in optical networks. 相似文献
119.
Kuriyama M Soeta T Hao X Chen Q Tomioka K 《Journal of the American Chemical Society》2004,126(26):8128-8129
A catalytic asymmetric arylation of sterically tuned imines with arylboroxines was developed by using N-Boc-l-valine-connected amidomonophosphane rhodium(I) catalyst in n-PrOH. The TMS group used for the steric tuning of imines is convertible to other functionalities that are applicable as a key foothold for the carbon-carbon bond-forming coupling reactions. 相似文献
120.
Tomohisa Yasuhara Katsumi Nishimura Ken-ichi Yamada Kiyoshi Tomioka 《Tetrahedron letters》2004,45(15):3043-3045
(±)-γ-Lycorane 3 was synthesized in 52% overall yield via seven steps from 5 by employing the highly stereoselective nitro-Michael cyclization of 5 to 9 and diastereoselective conjugate addition of aryllithium to a nitroolefin 10 as two key steps. 相似文献