全文获取类型
收费全文 | 63186篇 |
免费 | 1018篇 |
国内免费 | 320篇 |
专业分类
化学 | 29774篇 |
晶体学 | 1074篇 |
力学 | 3372篇 |
综合类 | 8篇 |
数学 | 5773篇 |
物理学 | 24523篇 |
出版年
2022年 | 567篇 |
2021年 | 604篇 |
2020年 | 570篇 |
2019年 | 578篇 |
2018年 | 724篇 |
2017年 | 636篇 |
2016年 | 1084篇 |
2015年 | 782篇 |
2014年 | 1190篇 |
2013年 | 2822篇 |
2012年 | 2631篇 |
2011年 | 3329篇 |
2010年 | 2298篇 |
2009年 | 2365篇 |
2008年 | 2982篇 |
2007年 | 2781篇 |
2006年 | 2603篇 |
2005年 | 2298篇 |
2004年 | 2106篇 |
2003年 | 1844篇 |
2002年 | 1729篇 |
2001年 | 3062篇 |
2000年 | 2203篇 |
1999年 | 1591篇 |
1998年 | 1110篇 |
1997年 | 1094篇 |
1996年 | 935篇 |
1995年 | 825篇 |
1994年 | 737篇 |
1993年 | 665篇 |
1992年 | 986篇 |
1991年 | 979篇 |
1990年 | 880篇 |
1989年 | 769篇 |
1988年 | 759篇 |
1987年 | 830篇 |
1986年 | 693篇 |
1985年 | 916篇 |
1984年 | 852篇 |
1983年 | 592篇 |
1982年 | 594篇 |
1981年 | 561篇 |
1980年 | 517篇 |
1979年 | 656篇 |
1978年 | 678篇 |
1977年 | 680篇 |
1976年 | 597篇 |
1975年 | 501篇 |
1974年 | 534篇 |
1973年 | 462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.
3.
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
4.
Yang T. L. Kao C. L. Kuo C. E. Yeh H. C. Li W. J. Li H. T. Chen C. Y. 《Chemistry of Natural Compounds》2022,58(5):825-827
Chemistry of Natural Compounds - A novel bibenzyl derivative, hydrangchinenin (1), was isolated from the stems of Hydrangea chinensis Maxim. (Hydrangeaceae). Its structure was determined on the... 相似文献
5.
Giang Truong Nguyen Prof. Dr. Liviu Ungur 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(30):e202200227
Employing radical bridges between anisotropic metal ions has been a viable route to achieve high-performance single-molecule magnets (SMMs). While the bridges have been mainly considered for their ability to promote exchange interactions, the crystal-field effect arising from them has not been taken into account explicitly. This lack of consideration may distort the understanding and limit the development of the entire family. To shed light on this aspect, herein we report a theoretical investigation of a series of N -radical-bridged diterbium complexes. It is found that while promoting strong exchange coupling between the terbium ions, the N -radical induces a crystal field that interferes destructively with that of the outer ligands, and thus reduces the overall SMM behavior. Based on the theoretical results, we conclude that the SMM behavior in this series could be further maximized if the crystal field of the outer ligands is designed to be collinear with that of the radical bridge. This conclusion can be generalized to all exchange-coupled SMMs. 相似文献
6.
Kobayashi M. Zhang Y. Ishikawa H. Sun J. Oddershede J. Juul Jensen D. Miura H. 《Experimental Mechanics》2021,61(5):817-828
Experimental Mechanics - The internal strain distribution developing during plastic deformation is important for understanding the mechanical properties of polycrystalline materials. Such... 相似文献
7.
8.
Li Y. Shi W. H. Dong L. M. Xu S. X. Huang H. J. Yin J. R. 《Journal of Applied Spectroscopy》2022,89(3):534-541
Journal of Applied Spectroscopy - Sr3B2O6:Dy3+, Eu3+ single-matrix white-light-emitting materials are prepared using the high-temperature solid-state method. The microstructure, emission spectrum,... 相似文献
9.
Physics of Atomic Nuclei - We have investigated the robustness of the spin-navigator based method for manipulating the beam polarization to bend magnet installation errors. Toward that end,... 相似文献
10.
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