全文获取类型
收费全文 | 579980篇 |
免费 | 4661篇 |
国内免费 | 1209篇 |
专业分类
化学 | 265932篇 |
晶体学 | 6909篇 |
力学 | 33139篇 |
综合类 | 10篇 |
数学 | 89884篇 |
物理学 | 189976篇 |
出版年
2021年 | 4873篇 |
2020年 | 5421篇 |
2019年 | 6335篇 |
2018年 | 13249篇 |
2017年 | 13657篇 |
2016年 | 14440篇 |
2015年 | 6807篇 |
2014年 | 11512篇 |
2013年 | 24158篇 |
2012年 | 21416篇 |
2011年 | 29209篇 |
2010年 | 21221篇 |
2009年 | 21603篇 |
2008年 | 26638篇 |
2007年 | 28309篇 |
2006年 | 19101篇 |
2005年 | 19342篇 |
2004年 | 17042篇 |
2003年 | 15734篇 |
2002年 | 14046篇 |
2001年 | 15345篇 |
2000年 | 11695篇 |
1999年 | 8659篇 |
1998年 | 7616篇 |
1997年 | 7361篇 |
1996年 | 6881篇 |
1995年 | 6258篇 |
1994年 | 6262篇 |
1993年 | 6130篇 |
1992年 | 6476篇 |
1991年 | 6986篇 |
1990年 | 6695篇 |
1989年 | 6632篇 |
1988年 | 6283篇 |
1987年 | 6478篇 |
1986年 | 6037篇 |
1985年 | 7384篇 |
1984年 | 7661篇 |
1983年 | 6450篇 |
1982年 | 6629篇 |
1981年 | 6215篇 |
1980年 | 6010篇 |
1979年 | 6662篇 |
1978年 | 6727篇 |
1977年 | 6810篇 |
1976年 | 6867篇 |
1975年 | 6387篇 |
1974年 | 6208篇 |
1973年 | 6439篇 |
1972年 | 5000篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Zmushko V. V. Razin A. N. Sinelnikova A. A. 《Journal of Applied Mechanics and Technical Physics》2022,63(3):400-407
Journal of Applied Mechanics and Technical Physics - Turbulent mixing at interfaces of three-layer gas systems after shock-wave passage has been studied. The influence of the initial roughness of... 相似文献
42.
Journal of Analytical Chemistry - The review considers the historical aspects of the formation and development of bioelectrochemistry and some issues of the analytical application of... 相似文献
43.
Crystallography Reports - Perfect stoichiometric Pb5Ge3O11 single crystals have been synthesized by the flux method. Their cationic and anionic stoichiometry is confirmed by chemical analysis. The... 相似文献
44.
Doklady Mathematics - The paper studies the asymptotic behavior of the optimal control for the Poisson type boundary value problem in a domain perforated by holes of an arbitrary shape with... 相似文献
45.
Elizarov A. M. Kirillovich A. V. Lipachev E. K. Nevzorova O. A. 《Doklady Mathematics》2022,106(3):429-435
Doklady Mathematics - The article describes OntoMathPRO, the first Linked Open Data ontology of professional mathematical knowledge. The ontology is designed to represent mathematical concepts. The... 相似文献
46.
Russian Chemical Bulletin - Oxidation of methane with a hydrogen-air mixture at 70 °C and a partial pressure of methane of 30 atm was studied. Water-soluble glutathione-stabilized nanoclusters... 相似文献
47.
Yakupova Z. R. Lebedinets S. A. Vakh K. S. Garmonov S. Yu. Bulatov A. V. 《Journal of Analytical Chemistry》2022,77(3):342-346
Journal of Analytical Chemistry - A method is proposed for the chromatographic determination of 17-β-estradiol in medicinal preparations with the microextraction of the analyte from a sample... 相似文献
48.
Dev Raj Alok Kumar Rohit Kumar Singh Abhishek Singh Bhadouria A.S.K. Sinha Deepak Dwivedi 《Current Opinion in Electrochemistry》2022
As the application of electrocatalyst continues to expand, envisaging the hidden mechanisms occurring at various length scale affecting the catalytic efficiency became important. To enhance the stability of electrocatalyst and reduce the cost, it is of paramount importance to reveal the active site's dynamics (using in situ techniques for getting the real-time information) which directly affect the reactions such as oxygen evolution reaction, hydrogen evolution reaction, and so on. Since such reactions are crucial for many engineering and scientific applications, in situ characterization techniques are required, which could capture such reactions happening at a different length and time scale. This article analyzes the recent progress made in the field of electrocatalyst's characterization using in situ neutron techniques. The article also paves the future path and has delineated the future challenges involved in multiscale correlative techniques (e.g., neutron techniques in the combination of synchrotron or microscopic techniques) used for getting the multiscale (atomic to micrometer range) mechanistic information about the electrocatalyst's working and degradation. 相似文献
49.
Journal of Russian Laser Research - We construct Gaussian coherent states of a free particle with time-dependent mass, using symplectic tomographic probability distribution and integrals of motion... 相似文献
50.
Chumaevskii A. V. Zykova A. P. Gusarova A. V. Guryanov D. A. Rubtsov V. E. Kolubaev E. A. 《Russian Physics Journal》2022,65(2):303-311
Russian Physics Journal - The results of model experimental studies of structural-phase changes in an AA2024 aluminum alloy after friction with a counter-body of a complex configuration are... 相似文献