全文获取类型
收费全文 | 878170篇 |
免费 | 10463篇 |
国内免费 | 3887篇 |
专业分类
化学 | 461134篇 |
晶体学 | 12178篇 |
力学 | 42227篇 |
综合类 | 40篇 |
数学 | 117452篇 |
物理学 | 259489篇 |
出版年
2021年 | 7780篇 |
2020年 | 8391篇 |
2019年 | 9344篇 |
2018年 | 12063篇 |
2017年 | 11964篇 |
2016年 | 17833篇 |
2015年 | 10708篇 |
2014年 | 16763篇 |
2013年 | 40016篇 |
2012年 | 30877篇 |
2011年 | 37304篇 |
2010年 | 26808篇 |
2009年 | 26686篇 |
2008年 | 34557篇 |
2007年 | 34252篇 |
2006年 | 31724篇 |
2005年 | 28583篇 |
2004年 | 26729篇 |
2003年 | 23545篇 |
2002年 | 23336篇 |
2001年 | 24505篇 |
2000年 | 19048篇 |
1999年 | 14895篇 |
1998年 | 12700篇 |
1997年 | 12349篇 |
1996年 | 11872篇 |
1995年 | 10728篇 |
1994年 | 10624篇 |
1993年 | 10289篇 |
1992年 | 11162篇 |
1991年 | 11422篇 |
1990年 | 11009篇 |
1989年 | 10718篇 |
1988年 | 10600篇 |
1987年 | 10394篇 |
1986年 | 9874篇 |
1985年 | 12800篇 |
1984年 | 13277篇 |
1983年 | 10946篇 |
1982年 | 11427篇 |
1981年 | 10905篇 |
1980年 | 10323篇 |
1979年 | 11093篇 |
1978年 | 11454篇 |
1977年 | 11232篇 |
1976年 | 11208篇 |
1975年 | 10642篇 |
1974年 | 10572篇 |
1973年 | 10678篇 |
1972年 | 7659篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
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
62.
Designs, Codes and Cryptography - Given an integer $$k\ge 3$$ and a group G of odd order, if there exists a 2-(v, k, 1)-design and if v is sufficiently large then there... 相似文献
63.
Smirnova T. D. Zhelobitskaya E. A. Danilina T. G. 《Journal of Analytical Chemistry》2022,77(8):1000-1004
Journal of Analytical Chemistry - Silver nanoparticles modified with Eu3+ ions increase the intensity of the fluorescence signal by a factor of 125 in an analytical system containing doxycycline as... 相似文献
64.
Computational Optimization and Applications - We consider a continuous-time optimization method based on a dynamical system, where a massive particle starting at rest moves in the conservative... 相似文献
65.
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
66.
Vasile M. Loots H. Vercammen L. Bruggeman M. Verrezen F. 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(8):3349-3357
Journal of Radioanalytical and Nuclear Chemistry - In this paper a study for the selection of an NPE (nonylphenol ethoxylates)—free cocktail is discussed in order to be used for our routine... 相似文献
67.
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
68.
Russian Chemical Bulletin - The N-methylation of primary carboxamides is based on two consecutive reactions. The silylation of the corresponding carboxamides with chloro(chloromethyl)dimethylsilane... 相似文献
69.
Journal of Structural Chemistry - Structural parameters and relative Gibbs free energies are calculated by density functional theory methods for four tetrafluoro derivatives of zinc(II)... 相似文献
70.
Crystallography Reports - Electron backscattered diffraction (EBSD) has been used to analyze structures of natural minerals and artificial compounds for almost three decades. In recent years, it is... 相似文献