全文获取类型
收费全文 | 344308篇 |
免费 | 20964篇 |
国内免费 | 413篇 |
专业分类
化学 | 196115篇 |
晶体学 | 3817篇 |
力学 | 19168篇 |
综合类 | 3篇 |
数学 | 45529篇 |
物理学 | 101053篇 |
出版年
2023年 | 4911篇 |
2021年 | 5814篇 |
2020年 | 8407篇 |
2019年 | 6701篇 |
2018年 | 8760篇 |
2017年 | 7145篇 |
2016年 | 13930篇 |
2015年 | 9432篇 |
2014年 | 12252篇 |
2013年 | 17721篇 |
2012年 | 13612篇 |
2011年 | 13053篇 |
2010年 | 13668篇 |
2009年 | 13822篇 |
2008年 | 12641篇 |
2007年 | 12101篇 |
2006年 | 10203篇 |
2005年 | 8793篇 |
2004年 | 8496篇 |
2003年 | 7877篇 |
2002年 | 8156篇 |
2001年 | 7731篇 |
2000年 | 6100篇 |
1999年 | 4542篇 |
1998年 | 4308篇 |
1997年 | 4237篇 |
1996年 | 3770篇 |
1995年 | 3397篇 |
1994年 | 3420篇 |
1993年 | 3557篇 |
1992年 | 3447篇 |
1991年 | 3810篇 |
1990年 | 3775篇 |
1989年 | 3795篇 |
1988年 | 3629篇 |
1987年 | 3684篇 |
1986年 | 3337篇 |
1985年 | 3905篇 |
1984年 | 4122篇 |
1983年 | 3533篇 |
1982年 | 3781篇 |
1981年 | 3500篇 |
1979年 | 3773篇 |
1978年 | 3875篇 |
1977年 | 4162篇 |
1976年 | 4292篇 |
1975年 | 4112篇 |
1974年 | 3988篇 |
1973年 | 3991篇 |
1972年 | 3614篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Mazurenko V. V. Kvashnin Y. O. Lichtenstein A. I. Katsnelson M. I. 《Journal of Experimental and Theoretical Physics》2021,132(4):506-516
Journal of Experimental and Theoretical Physics - Dzyaloshinskii–Moriya interaction, DMI in short, represents an antisymmetric type of magnetic interactions that favor orthogonal orientation... 相似文献
2.
Kinetics and Catalysis - The catalytic properties of a nickel phosphide catalyst supported on silica gel in the reductive amination of carbonyl compounds were studied in a flow reactor using... 相似文献
3.
Chuprin A. S. Belova S. A. Bugaenko M. G. Vologzhanina A. V. Loktev A. S. Voloshin Ya. Z. Buznik V. M. Dedov A. G. 《Kinetics and Catalysis》2022,63(1):108-116
Kinetics and Catalysis - A new ruthenium(II) cage complex with polar terminal groups in the apical substituents has been synthesized; the molecular design of the complex contributes to the... 相似文献
4.
Rastsvetaeva R. K. Chukanov N. V. Pekov I. V. Varlamov D. A. Kazheva O. N. 《Crystallography Reports》2022,67(2):166-171
Crystallography Reports - The crystal structure and crystallochemical features of a Fe-deficient zirconium-rich analog of eudialyte from the Lovozero alkaline massif (Kola peninsula) have been... 相似文献
5.
Qianqian Fan Zirui Liu Feng Qiu Prof. Yong Mao Prof. Qingju Liu Prof. Longzhou Zhang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(63):e202202700
The artificially accurate design of nonmetal electrocatalysts’ active site has been a huge challenge because no pure active species with the specific structure could be strictly controlled by traditional synthetic methods. Species with a multiconfiguration in the catalyst hinder identification of the active site and the subsequent comprehension of the reaction mechanism. We have developed a novel electro-assisted molecular assembly strategy to obtain a pure pentagon ring on perfect graphene avoiding other reconstructed structures. More importantly, the active atom was confirmed by the subtle passivation process as the topmost carbon atom. Recognition of the carbon-defect electrocatalysis reaction mechanism was first downsized to the single-atom scale from the experimental perspective. It is expected that this innovative electro-assisted molecular assembly strategy could be extensively applied in the active structure-controlled synthesis of nonmetal electrocatalysts and verification of the exact active atom. 相似文献
6.
Gaineev A. M. Galkina I. V. Davletshin R. R. Davletshina N. V. Kuznetsov N. O. Grishaev D. Yu. Shulayeva M. P. Pozdeev O. K. 《Russian Journal of General Chemistry》2022,92(7):1208-1213
Russian Journal of General Chemistry - Aminophosphabetaines, i.e., isobutyl {[alkyl(dimethyl)ammonio]methyl}phosphonates with higher alkyl substituents at the nitrogen atom, were obtained by a... 相似文献
7.
Shilin Jiang Dr. Yalan Liu Dr. Lin Wang Prof. Zhifang Chai Prof. Wei-Qun Shi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(60):e202201145
The coordination chemistry of f-block elements (lanthanide and actinide) in molten salts has become a resounding topic in view of its great importance to the research and development (R&D) of molten salt reactors and pyroprocessing. In this Review article, a general overview of the coordination chemistry of f-block elements in molten salts is provided including past achievements and recent advances. Particular emphases are placed on the oxidation state, speciation, and solution structure of f-block metal ions in molten salts, as well as their relationships with the salt composition. Furthermore, this review briefly discusses the spectroscopic and theoretical methods that complement each other in revealing the coordination properties. 相似文献
8.
Chemistry of Natural Compounds - O- and N-propylamino-derivatives of betulin and betulonic acid oxime and methyl ester were synthesized. Their antitumor activity against a panel of 60 human cancer... 相似文献
9.
Romanenko G. V. Fokin S. V. Bogomyakov A. S. Zueva E. M. Ovcharenko V. I. 《Journal of Structural Chemistry》2022,63(3):441-450
Journal of Structural Chemistry - The structures of Ni(II), Cu(II), and Zn(II) complexes with anions of 2,5-pyrrolyl-disubstituted nitronyl nitroxide (L1) and iminonitroxide (L2) diradicals (HL1 is... 相似文献
10.
Kinetics and Catalysis - The results of studies in the field of synthesis and characterization of layered double hydroxides (LDHs) obtained using solid-phase reactions are summarized. The effect of... 相似文献