全文获取类型
收费全文 | 1152篇 |
免费 | 42篇 |
国内免费 | 14篇 |
专业分类
化学 | 804篇 |
晶体学 | 14篇 |
力学 | 10篇 |
数学 | 144篇 |
物理学 | 236篇 |
出版年
2022年 | 11篇 |
2021年 | 15篇 |
2020年 | 14篇 |
2019年 | 14篇 |
2018年 | 17篇 |
2017年 | 17篇 |
2016年 | 31篇 |
2015年 | 35篇 |
2014年 | 37篇 |
2013年 | 57篇 |
2012年 | 63篇 |
2011年 | 63篇 |
2010年 | 54篇 |
2009年 | 39篇 |
2008年 | 75篇 |
2007年 | 55篇 |
2006年 | 47篇 |
2005年 | 56篇 |
2004年 | 39篇 |
2003年 | 41篇 |
2002年 | 44篇 |
2001年 | 10篇 |
2000年 | 13篇 |
1998年 | 12篇 |
1997年 | 9篇 |
1996年 | 13篇 |
1995年 | 7篇 |
1994年 | 13篇 |
1993年 | 8篇 |
1992年 | 9篇 |
1991年 | 8篇 |
1990年 | 9篇 |
1989年 | 8篇 |
1985年 | 13篇 |
1984年 | 9篇 |
1982年 | 10篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 12篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1959年 | 13篇 |
1958年 | 23篇 |
1957年 | 16篇 |
1956年 | 14篇 |
1955年 | 11篇 |
1954年 | 18篇 |
排序方式: 共有1208条查询结果,搜索用时 45 毫秒
151.
Karel Hamal 《Czechoslovak Journal of Physics》1968,18(3):419-422
A solid state laser has been developed which employs a spherical pumping cavity. The rod of the active medium (ruby, neodymium, etc.) and the flash tube are symmetrically placed with respect to a plane passing through the centre of the sphere. With Nd3+-doped glass an efficiency of 3% is obtained. 相似文献
152.
153.
154.
The influence of the oxygen content on the saturation magnetic moment and the Curie temperature was studied experimentally on non-stoichiometric manganese ferrites having a varying excess of manganese. Taking into consideration the results of studying the electrical conductivity and magnetic relaxation effects, a model was elaborated for the distribution of ions in these ferrites, which starts out from the distribution of ions in stoichiometric manganese ferrite. The experimental results obtained by us and those of other authors confirm the justification of this model.
In conclusion the authors thank members of their technological department for preparing the samples and M. Mikulá for carefully carrying out the chemical analyses. 相似文献
II. Mn1+xFe2-xO4+y
. , . .
In conclusion the authors thank members of their technological department for preparing the samples and M. Mikulá for carefully carrying out the chemical analyses. 相似文献
155.
Karel Pátek 《Czechoslovak Journal of Physics》1958,8(5):612-613
156.
Karel Míšek 《Czechoslovak Journal of Physics》1954,4(1):67-86
. , E G. . . 相似文献
157.
158.
159.
Production of ethanol from enzymatically hydrolyzed orange peel by the yeastSaccharomyces cerevisiae
Grohmann Karel Baldwin Elizabeth A. Buslig Béla S. 《Applied biochemistry and biotechnology》1994,45(1):315-327
Applied Biochemistry and Biotechnology - We extended our previous investigations of enzymatic hydrolysis of polysaccharides in orange peel by commercial cellulase and pectinase enzymes to higher,... 相似文献
160.
Varilová T Seménková H Horák P Madera M Pacáková V Tichá M Stulík K 《Journal of separation science》2006,29(8):1110-1115
Interactions of boar, bull, and human seminal plasma proteins with heparin and phosphorylcholine were studied by affinity LC using heparin immobilized to a Toyopearl support. A step gradient elution from 0.15 to 1.50 M NaCl was employed to elute the seminal plasma proteins. Relative amounts of the heparin-binding fraction of seminal plasma proteins (H+) in seminal plasma of three species were determined. Further on, the fraction of seminal plasma proteins interacting with phosphorylcholine-binding proteins (P+) was evaluated. P+ proteins were not found in human seminal plasma and their highest amount was present in bull seminal plasma. A CE method was developed for separation of seminal plasma proteins. Various capillaries and separation conditions were tested; the best resolution was obtained in a bare-silica capillary, with a micellar system consisting of a 0.02 M borate buffer and 0.05 M SDS pH 10.0. The optimized conditions were applied to the identification of the components in boar plasma. 相似文献