全文获取类型
收费全文 | 85508篇 |
免费 | 944篇 |
国内免费 | 113篇 |
专业分类
化学 | 46944篇 |
晶体学 | 1325篇 |
力学 | 3433篇 |
综合类 | 1篇 |
数学 | 8845篇 |
物理学 | 26017篇 |
出版年
2022年 | 605篇 |
2021年 | 968篇 |
2020年 | 1112篇 |
2019年 | 1236篇 |
2018年 | 1758篇 |
2017年 | 1822篇 |
2016年 | 2471篇 |
2015年 | 1272篇 |
2014年 | 1973篇 |
2013年 | 3828篇 |
2012年 | 3428篇 |
2011年 | 3874篇 |
2010年 | 2927篇 |
2009年 | 2882篇 |
2008年 | 3528篇 |
2007年 | 3411篇 |
2006年 | 3223篇 |
2005年 | 2852篇 |
2004年 | 2552篇 |
2003年 | 2377篇 |
2002年 | 2423篇 |
2001年 | 2413篇 |
2000年 | 1802篇 |
1999年 | 1368篇 |
1998年 | 1203篇 |
1997年 | 1116篇 |
1996年 | 990篇 |
1995年 | 898篇 |
1994年 | 879篇 |
1993年 | 900篇 |
1992年 | 934篇 |
1991年 | 975篇 |
1990年 | 910篇 |
1989年 | 937篇 |
1988年 | 843篇 |
1987年 | 795篇 |
1986年 | 762篇 |
1985年 | 925篇 |
1984年 | 1022篇 |
1983年 | 853篇 |
1982年 | 869篇 |
1981年 | 773篇 |
1980年 | 722篇 |
1979年 | 781篇 |
1978年 | 913篇 |
1977年 | 931篇 |
1976年 | 820篇 |
1975年 | 790篇 |
1974年 | 804篇 |
1973年 | 765篇 |
排序方式: 共有10000条查询结果,搜索用时 218 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.
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
3.
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
4.
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
5.
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
6.
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
7.
Kopytov G. F. Malyshko V. V. Goryachko A. I. Sharafan M. V. Churkina A. V. Moiseev A. V. Shashkov D. I. Lyasota O. M. 《Russian Physics Journal》2021,64(2):255-260
Russian Physics Journal - The specific features of the sorption activity of silver nanoparticles (AgNPs) on biodegradable polymers of natural (collagen) and artificial (polyamide 6.6) origin have... 相似文献
8.
General Relativity and Gravitation - In previous work, we established theoretical results concerning the effect of matter shells surrounding a gravitational wave (GW) source, and we now apply these... 相似文献
9.
Dr. Joaquim Torra Dr. Felipe Viela Dr. Diego Megías Dr. Begoña Sot Prof. Cristina Flors 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(19):e202200026
CRANAD-2 is a fluorogenic curcumin derivative used for near-infrared detection and imaging in vivo of amyloid aggregates, which are involved in neurodegenerative diseases. We explore the performance of CRANAD-2 in two super-resolution imaging techniques, namely stimulated emission depletion (STED) and single-molecule localization microscopy (SMLM), with markedly different fluorophore requirements. By conveniently adapting the concentration of CRANAD-2, which transiently binds to amyloid fibrils, we show that it performs well in both techniques, achieving a resolution in the range of 45–55 nm. Correlation of SMLM with atomic force microscopy (AFM) validates the resolution of fine features in the reconstructed super-resolved image. The good performance and versatility of CRANAD-2 provides a powerful tool for near-infrared nanoscopic imaging of amyloids in vitro and in vivo. 相似文献
10.
The health monitoring has been studied to ensure integrity of design of engine structure by detection, quantification, and prediction of damages. Early detection of faults may allow the downtime of maintenance to be rescheduled, thus preventing sudden shutdown of machines. In cylinder pressure developed, vibrations and noise emissions data provide a rich source of information about condition of engines. Monitoring of vibrations and noise emissions are novel non-intrusive methodologies for which positioning of various transducers are important issue. The presented work shows applicability of these diagnosis methodologies adopted in case of diesel engines. The effects of changing various fuel injection parameters was analyzed. Scope of using non-intrusive technique has been analyzed by changing locations of microphone. Novelty of this worklies in exploring signal processing methods for various locations around the engine test set up. Various frequency ranges of contributing noise and vibration sources were identified. Time-Frequency analysis showed the onset of various cyclic. Based on the identification of various frequency bands, it is possible to device suitable filters in order to extract more information. 相似文献