全文获取类型
收费全文 | 91647篇 |
免费 | 1009篇 |
国内免费 | 434篇 |
专业分类
化学 | 50097篇 |
晶体学 | 1354篇 |
力学 | 3675篇 |
综合类 | 31篇 |
数学 | 9698篇 |
物理学 | 28235篇 |
出版年
2022年 | 784篇 |
2021年 | 1051篇 |
2020年 | 1138篇 |
2019年 | 1279篇 |
2018年 | 1762篇 |
2017年 | 1817篇 |
2016年 | 2469篇 |
2015年 | 1316篇 |
2014年 | 2071篇 |
2013年 | 4030篇 |
2012年 | 3497篇 |
2011年 | 3958篇 |
2010年 | 3138篇 |
2009年 | 3118篇 |
2008年 | 3640篇 |
2007年 | 3553篇 |
2006年 | 3313篇 |
2005年 | 2992篇 |
2004年 | 2788篇 |
2003年 | 2635篇 |
2002年 | 2724篇 |
2001年 | 2661篇 |
2000年 | 2013篇 |
1999年 | 1544篇 |
1998年 | 1339篇 |
1997年 | 1225篇 |
1996年 | 1102篇 |
1995年 | 1054篇 |
1994年 | 1020篇 |
1993年 | 978篇 |
1992年 | 1025篇 |
1991年 | 1084篇 |
1990年 | 1057篇 |
1989年 | 1042篇 |
1988年 | 939篇 |
1987年 | 897篇 |
1986年 | 859篇 |
1985年 | 1071篇 |
1984年 | 1188篇 |
1983年 | 976篇 |
1982年 | 1001篇 |
1981年 | 886篇 |
1980年 | 840篇 |
1979年 | 903篇 |
1978年 | 997篇 |
1977年 | 1067篇 |
1976年 | 945篇 |
1975年 | 887篇 |
1974年 | 895篇 |
1973年 | 871篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
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
2.
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
3.
Hassan E. A. M. Elabid A. E. A. Bashier E. O. Elagib T. H. H. 《Mechanics of Composite Materials》2022,58(2):261-270
Mechanics of Composite Materials - Carbon fiber (CF)/ polyamide (PA6) composites are one of the most promising thermoplastic materials for automobile applications. However, the interfacial... 相似文献
4.
Tsyganova S. I. Fetisova O. Yu. Mazurova E. N. Taran O. P. Kuznetsov B. N. 《Russian Journal of Applied Chemistry》2022,95(3):408-416
Russian Journal of Applied Chemistry - A method for the disposal of hydrolysis lignin waste based on its modification with ZnCl2 and FeCl3 and subsequent carbonization at 800°C was proposed.... 相似文献
5.
Mathematical Notes - Subspaces of the space of analytic functions on a convex domain in the complex plane that are invariant with respect to the differentiation operator are studied. The problem of... 相似文献
6.
Reza Kordnezhadian Bing-Yu Li Armir Zogu Dr. Joachim Demaerel Prof. Dr. Wim M. De Borggraeve Dr. Ermal Ismalaj 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(60):e202201491
Pentafluorosulfanyl (SF5)-containing compounds and corresponding analogs are a highly valuable class of fluorine-containing building blocks owing to their unique properties. The reason for that is the set of peculiar and tremendously beneficial characteristics they can impart on molecules once introduced onto them. Despite this, their application in distinct scientific fields remains modest, given the extremely harsh reaction conditions needed to access such compounds. The recent synthetic approaches via S−F, and C−SF5 bond formation as well as the use of SF5-containing building blocks embody a “stairway-to-heaven” loophole in the synthesis of otherwise-inaccessible chemical scaffolds only a few years ago. Herein, we report and evaluate the properties of the SF5 group and analogs, by summarizing synthetic methodologies available to access them as well as following applications in material science and medicinal chemistry since 2015. 相似文献
7.
Daulbaev O. Isaenko L. I. Bogdzel’ A. A. Lobanov S. I. Krinitsyn P. G. Milkov V. M. Belushkin A. V. 《Crystallography Reports》2022,67(3):464-469
Crystallography Reports - Two LiInSe2 single crystals, grown under different conditions, have been studied. Characteristics of these crystals for neutron detection have been compared using... 相似文献
8.
Kolesnikov A. O. Shatokhin A. N. Vishnyakov E. A. Ragozin E. N. 《Journal of Russian Laser Research》2022,43(4):467-475
Journal of Russian Laser Research - We analyze the way of advancing to tender X-rays the short-wavelength bound of the operating range of flat-field grating spectrographs. We design two VLS grating... 相似文献
9.
Ukrainian Mathematical Journal - We establish new criteria of compatibility for a linear system of equations (equivalent to the Kronecker–Capelli theorem) or inequalities (equivalent to the... 相似文献
10.
Crystallography Reports - The specific features of the formation of crystallites in gallium arsenide crystals grown by the Czochralski method have been investigated. The crystallites are found to... 相似文献