全文获取类型
收费全文 | 619篇 |
免费 | 30篇 |
国内免费 | 2篇 |
专业分类
化学 | 546篇 |
晶体学 | 4篇 |
力学 | 7篇 |
数学 | 43篇 |
物理学 | 51篇 |
出版年
2024年 | 2篇 |
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 29篇 |
2020年 | 21篇 |
2019年 | 43篇 |
2018年 | 38篇 |
2017年 | 23篇 |
2016年 | 34篇 |
2015年 | 24篇 |
2014年 | 36篇 |
2013年 | 32篇 |
2012年 | 45篇 |
2011年 | 44篇 |
2010年 | 34篇 |
2009年 | 26篇 |
2008年 | 26篇 |
2007年 | 30篇 |
2006年 | 17篇 |
2005年 | 25篇 |
2004年 | 8篇 |
2003年 | 8篇 |
2002年 | 11篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1971年 | 3篇 |
1969年 | 2篇 |
1967年 | 4篇 |
1966年 | 2篇 |
排序方式: 共有651条查询结果,搜索用时 46 毫秒
1.
Dr. Yulia Y. Enakieva Dr. Anna A. Sinelshchikova Prof. Mikhail S. Grigoriev Prof. Vladimir V. Chernyshev Dr. Konstantin A. Kovalenko Prof. Irina A. Stenina Prof. Andrey B. Yaroslavtsev Prof. Yulia G. Gorbunova Prof. Aslan Y. Tsivadze 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(45):10552-10556
The design of new solid-state proton-conducting materials is a great challenge for chemistry and materials science. Herein, a new anionic porphyrinylphosphonate-based MOF ( IPCE-1Ni ), which involves dimethylammonium (DMA) cations for charge compensation, is reported. As a result of its unique structure, IPCE-1Ni exhibits one of the highest value of the proton conductivity among reported proton-conducting MOF materials based on porphyrins (1.55×10−3 S cm−1 at 75 °C and 80 % relative humidity). 相似文献
2.
3.
Statistical Inference with Fractional Brownian Motion 总被引:3,自引:1,他引:2
Kukush Alexander Mishura Yulia Valkeila Esko 《Statistical Inference for Stochastic Processes》2005,8(1):71-93
We give a test between two complex hypothesis; namely we test whether a fractional Brownian motion (fBm) has a linear trend against a certain non-linear trend. We study some related questions, like goodness-of-fit test and volatility estimation in these models. 相似文献
4.
5.
I. E. Simonova 《Journal of Mathematical Sciences》1987,39(4):2902-2908
The distribution functions F(x) and functionals of F(x) are estimated from treatment-effect observations.Translated from Statisticheskie Metody, pp. 125–133, 1982. 相似文献
6.
Fabien Fontaine Evan Bolton Yulia Borodina Stephen H Bryant 《Chemistry Central journal》2007,1(1):12-14
Background
Large chemical databases require fast, efficient, and simple ways of looking for similar structures. Although such tasks are now fairly well resolved for graph-based similarity queries, they remain an issue for 3D approaches, particularly for those based on 3D shape overlays. Inspired by a recent technique developed to compare molecular shapes, we designed a hybrid methodology, alignment-recycling, that enables efficient retrieval and alignment of structures with similar 3D shapes. 相似文献7.
E.G. Zhizhina M.V. Simonova V.F. Odyakov K.I. Matveev 《Reaction Kinetics and Catalysis Letters》2003,80(1):171-179
Oxidation of butene-1 to butanone in the presence of homogeneous catalysts (PdSO4 + HPA-x), where HPA-x = H3+xPVxMo12-xO40, 1 £ x £ 4, was investigated. This reaction is found to be of the 1st order with respect to C4H8, and of the 0.64th order with respect to Pd. The reaction rate does not depend on the HPA-x concentration and pH of the solution.
The activation energy of the reaction is variable. A kinetic expression of the reaction is obtained for 303-343 K.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
8.
V. V. Natarov L. N. Volovel'skii N. I. Pilipenko T. V. Zvyagintseva E. A. Bodrykh L. I. Simonova L. P. Abramova 《Chemistry of Natural Compounds》1990,26(1):70-71
A comparative study has been made of the radioprotector activity of cystamine and the synthesized cobalt and copper salts of N-succinylmethionine. Activity falls in the sequence cystamine-copper salt-cobalt salt.Khar'kov Scientific-Research Institute of Endocrinology and Hormone Chemistry. Khar'kov Medical Institute. Khar'kov Scientific-Research Institute of Medical Radiology. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 86–88, January–February, 1990. 相似文献
9.
Simonova L. G. Barelko V. V. Toktarev A. V. Chernyshov A. F. Chumachenko V. A. Bal'zhinimaev B. S. 《Kinetics and Catalysis》2002,43(1):61-66
Platinum catalysts (0.003–0.52% Pt) based on leached sodium silicate and boron silicate fiberglass supports are studied in the complete oxidation of hydrocarbons (n-butane and propane) and high-temperature SO2 oxidation. It was shown that platinum localized in the bulk of the glass matrix show a higher activity and thermal stability than metal particles supported on the outer surface of fiberglass. The experimental results for hydrocarbon oxidation on platinum-containing fiberglass gauzes at short contact times are discussed. 相似文献
10.
B. V. Deryagin I. G. Ershova V. Kh. Simonova N. V. Churaev 《Theoretical and Experimental Chemistry》1971,4(4):339-341
It is shown that these columns are formed in the kinetic mode from unsaturated water vapor. The condensation coefficient for an anomalous column is much less than for ordinary water. The growth rate is dependent on the equilibration time for the concentration of the anomalous component in the column. The diffusion coefficient for the anomalous component in water is less than the self-diffusion coefficient of water by nearly an order of magnitude; this and the low volatility are to be ascribed to large molecular size. It is supposed that the molecules of the anomalous component are strong groups of H2O molecules that are only slowly converted to monomers. 相似文献