全文获取类型
收费全文 | 1096篇 |
免费 | 9篇 |
国内免费 | 12篇 |
专业分类
化学 | 594篇 |
晶体学 | 5篇 |
力学 | 35篇 |
数学 | 325篇 |
物理学 | 158篇 |
出版年
2019年 | 7篇 |
2016年 | 13篇 |
2015年 | 14篇 |
2014年 | 20篇 |
2013年 | 31篇 |
2012年 | 27篇 |
2011年 | 37篇 |
2010年 | 24篇 |
2009年 | 22篇 |
2008年 | 41篇 |
2007年 | 52篇 |
2006年 | 38篇 |
2005年 | 42篇 |
2004年 | 42篇 |
2003年 | 26篇 |
2002年 | 25篇 |
2001年 | 22篇 |
2000年 | 15篇 |
1999年 | 12篇 |
1998年 | 19篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 20篇 |
1994年 | 14篇 |
1993年 | 10篇 |
1992年 | 19篇 |
1991年 | 13篇 |
1990年 | 13篇 |
1989年 | 14篇 |
1988年 | 18篇 |
1987年 | 19篇 |
1986年 | 35篇 |
1985年 | 25篇 |
1984年 | 16篇 |
1983年 | 12篇 |
1982年 | 19篇 |
1981年 | 15篇 |
1980年 | 28篇 |
1979年 | 31篇 |
1978年 | 22篇 |
1977年 | 10篇 |
1976年 | 19篇 |
1975年 | 19篇 |
1974年 | 26篇 |
1973年 | 20篇 |
1972年 | 15篇 |
1971年 | 14篇 |
1970年 | 13篇 |
1969年 | 6篇 |
1968年 | 8篇 |
排序方式: 共有1117条查询结果,搜索用时 218 毫秒
1.
Eberhard Hopf 《Mathematische Annalen》1940,117(1):764-775
Ohne Zusammenfassung 相似文献
2.
Sunanda Banerjee Rohini M Godbole Sreerup Raychaudhuri Ben Allanach Sunanda Banerjee Satyaki Bhattacharyya Debajyoti Choudhury Siba Prasad Das Anindya Datta Rohini M Godbole Monoranjan Guchait Sabine Kraml Gobinda Majumdar David Miller Margarete Mühlleitner Nobuchika Okada Maxim Perelstein Santosh K Rai Sreerup Raychaudhuri Saurabh D Rindani DP Roy K Sridhar Rishikesh Vaidya D Zeppenfeld 《Pramana》2006,67(4):617-637
This is summary of the activities of the working group on collider physics in the IXth Workshop on High Energy Physics Phenomenology
(WHEPP-9) held at the Institute of Physics, Bhubaneswar, India in January 2006. Some of the work subsequently done on these
problems by the subgroups formed during the workshop is included in this report. 相似文献
3.
This article deals with Leibniz's reception of Descartes' “geometry.” Leibnizian mathematics was based on five fundamental notions: calculus, characteristic, art of invention, method, and freedom. On the basis of methodological considerations Leibniz criticized Descartes' restriction of geometry to objects that could be given in terms of algebraic (i.e., finite) equations: “Descartes's mind was the limit of science.” The failure of algebra to solve equations of higher degree led Leibniz to develop linear algebra, and the failure of algebra to deal with transcendental problems led him to conceive of a science of the infinite. Hence Leibniz reconstructed the mathematical corpus, created new (transcendental) notions, and redefined known notions (equality, exactness, construction), thus establishing “a veritable complement of algebra for the transcendentals”: infinite equations, i.e., infinite series, became inestimable tools of mathematical research. 相似文献
4.
Using [Cp(Me)5Rh(bipy)C1]C1 (1) as redox catalyst for the continous NADH regeneration it was possible to perform an electrochemically driven enzymatic reduction of pyruvate to D-lactate catalyzed by D-LDH at a rate of 5 turnovers per hour. This is by a factor of 20 faster than the best results obtained until now. Current yields of 50 to 70 % may be obtained. 相似文献
5.
6.
7.
First, the demonstration of Bell's theorem, i.e., of the nonlocal character of quantum theory, is spelled out using the EPR criterion of reality as premises and a gedankenexperiment involving two particles. Then, the EPR criterion is extended to include quantities predicted almostwith certainty, and Bell's theorem is demonstrated on these new premises. The same experiment is used but in conditions that become possible in real life, without the requirements of ideal efficiencies and zero background. Very high efficiencies and low background are needed, but these requirements may be met in the future. 相似文献
8.
Eberhard Breitmaier 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》1973,85(15):676-677
9.
The carbobenzyloxy (cbz) protecting group is evaluated for it's potential to enhance the resolution of chiral amine enantiomers using high-performance liquid chromatography (HPLC) and supercritical fluid chromatography (SFC). A series of cbz derivatives of commercially available racemates was prepared and analyzed by enantioselective chromatography using a variety of mobile phases and polysaccharide and Pirkle-type chiral stationary phases (CSPs). The cbz-derivatized product consistently demonstrated enhanced chiral resolution under HPLC and SFC conditions. Improved selectivity and resolution combined with an automated preparative HPLC or SFC system can lead to the rapid generation of highly purified enantiomers of desirable starting materials, intermediates or final products. 相似文献
10.
Applied Biochemistry and Biotechnology - The US chemical industry is facing maturing markets, variability in raw materials supply, and stiff competition from emerging chemical industries in other... 相似文献