全文获取类型
收费全文 | 584100篇 |
免费 | 5681篇 |
国内免费 | 1737篇 |
专业分类
化学 | 287703篇 |
晶体学 | 8938篇 |
力学 | 28584篇 |
综合类 | 9篇 |
数学 | 81592篇 |
物理学 | 184692篇 |
出版年
2021年 | 4250篇 |
2020年 | 4582篇 |
2019年 | 5243篇 |
2018年 | 12824篇 |
2017年 | 13396篇 |
2016年 | 12899篇 |
2015年 | 6664篇 |
2014年 | 9844篇 |
2013年 | 24430篇 |
2012年 | 21234篇 |
2011年 | 30893篇 |
2010年 | 20885篇 |
2009年 | 20752篇 |
2008年 | 27373篇 |
2007年 | 29840篇 |
2006年 | 18447篇 |
2005年 | 21160篇 |
2004年 | 17440篇 |
2003年 | 15769篇 |
2002年 | 14291篇 |
2001年 | 15590篇 |
2000年 | 11866篇 |
1999年 | 9147篇 |
1998年 | 7644篇 |
1997年 | 7556篇 |
1996年 | 7188篇 |
1995年 | 6392篇 |
1994年 | 6202篇 |
1993年 | 6201篇 |
1992年 | 6725篇 |
1991年 | 6912篇 |
1990年 | 6624篇 |
1989年 | 6519篇 |
1988年 | 6353篇 |
1987年 | 6377篇 |
1986年 | 6061篇 |
1985年 | 7919篇 |
1984年 | 8115篇 |
1983年 | 6687篇 |
1982年 | 7072篇 |
1981年 | 6735篇 |
1980年 | 6601篇 |
1979年 | 6864篇 |
1978年 | 7126篇 |
1977年 | 6885篇 |
1976年 | 7066篇 |
1975年 | 6479篇 |
1974年 | 6559篇 |
1973年 | 6845篇 |
1972年 | 4604篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
Dr. Jun Zeng Dr. Zhichao Wang Dr. Xin Huang Dr. Sabine S. Eckstein Prof. Dr. Xiaohui Lin Prof. Dr. Hailong Piao Prof. Dr. Cora Weigert Dr. Peiyuan Yin Prof. Dr. Rainer Lehmann Prof. Dr. Guowang Xu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(21):5427-5432
Mass spectrometry (MS) driven metabolomics is a frequently used tool in various areas of life sciences; however, the analysis of polar metabolites is less commonly included. In general, metabolomic analyses lead to the detection of the total amount of all covered metabolites. This is currently a major limitation with respect to metabolites showing high turnover rates, but no changes in their concentration. Such metabolites and pathways could be crucial metabolic nodes (e.g., potential drug targets in cancer metabolism). A stable-isotope tracing capillary electrophoresis–mass spectrometry (CE-MS) metabolomic approach was developed to cover both polar metabolites and isotopologues in a non-targeted way. An in-house developed software enables high throughput processing of complex multidimensional data. The practicability is demonstrated analyzing [U-13C]-glucose exposed prostate cancer and non-cancer cells. This CE-MS-driven analytical strategy complements polar metabolite profiles through isotopologue labeling patterns, thereby improving not only the metabolomic coverage, but also the understanding of metabolism. 相似文献
162.
JETP Letters - At the resonant passage of a plane elastic shear wave through an acoustically continuous heterostructure consisting of magnetic and nonmagnetic layers in a symmetric nonmagnetic... 相似文献
163.
164.
165.
Ivanov K. A. Gubaidullin A. R. Morozov K. M. Sasin M. E. Kaliteevskii M. A. 《Optics and Spectroscopy》2019,126(6):787-787
Optics and Spectroscopy - 10.1134/S0030400X17050095 相似文献
166.
167.
168.
J. Conrad J. Cohen-Tanugi L. E. Strigari 《Journal of Experimental and Theoretical Physics》2015,121(6):1104-1135
The launch of the gamma-ray telescope Fermi Large Area Telescope (Fermi-LAT) started a pivotal period in indirect detection of dark matter. By outperforming expectations, for the first time a robust and stringent test of the paradigm of weakly interacting massive particles (WIMPs) is within reach. In this paper, we discuss astrophysical targets for WIMP detection and the challenges they present, review the analysis tools which have been employed to tackle these challenges, and summarize the status of constraints on and the claimed detections in the WIMP parameter space. Methods and results will be discussed in comparison to Imaging Air Cherenkov Telescopes. We also provide an outlook on short term and longer term developments. 相似文献
169.
170.
S. V. Panin I. V. Vlasov V. P. Sergeev B. B. Ovechkin P. O. Marushchak Sunder Ramasubbu P. S. Lyubutin V. V. Titkov 《Physical Mesomechanics》2015,18(3):261-272
The structure and properties of 12Cr1MoV steel irradiated with a zirconium ion beam were studied by optical microscopy, scanning electron microscopy, and micro- and nanoindentation. It is shown that the modification covers the entire cross-section of the irradiated specimens to a depth of 1 mm. The data on irradiation-induced structural changes are used to interpret the changes in mechanical properties of the irradiated specimens under static and cyclic loading. Particular attention is given to analysis of strain estimation by the digital image correlation method. 相似文献