全文获取类型
收费全文 | 13891篇 |
免费 | 2146篇 |
国内免费 | 2057篇 |
专业分类
化学 | 10859篇 |
晶体学 | 164篇 |
力学 | 756篇 |
综合类 | 151篇 |
数学 | 1578篇 |
物理学 | 4586篇 |
出版年
2024年 | 7篇 |
2023年 | 206篇 |
2022年 | 233篇 |
2021年 | 398篇 |
2020年 | 526篇 |
2019年 | 520篇 |
2018年 | 396篇 |
2017年 | 421篇 |
2016年 | 630篇 |
2015年 | 687篇 |
2014年 | 764篇 |
2013年 | 970篇 |
2012年 | 1166篇 |
2011年 | 1344篇 |
2010年 | 914篇 |
2009年 | 868篇 |
2008年 | 1026篇 |
2007年 | 870篇 |
2006年 | 844篇 |
2005年 | 780篇 |
2004年 | 591篇 |
2003年 | 521篇 |
2002年 | 533篇 |
2001年 | 440篇 |
2000年 | 324篇 |
1999年 | 303篇 |
1998年 | 246篇 |
1997年 | 208篇 |
1996年 | 182篇 |
1995年 | 199篇 |
1994年 | 146篇 |
1993年 | 140篇 |
1992年 | 109篇 |
1991年 | 135篇 |
1990年 | 85篇 |
1989年 | 75篇 |
1988年 | 73篇 |
1987年 | 49篇 |
1986年 | 41篇 |
1985年 | 33篇 |
1984年 | 17篇 |
1983年 | 17篇 |
1982年 | 19篇 |
1981年 | 9篇 |
1980年 | 5篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1975年 | 4篇 |
1957年 | 2篇 |
1936年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
81.
82.
83.
84.
85.
Russian Physics Journal - The improvement of chip integration leads to the increase of power density of system chips, which leads to the overheating of system chips. When dispatching the power... 相似文献
86.
87.
Hu Qiu-Fen Zhang Ling-Fang Liu Ming-Xin Cai Bing-Biao Li Yong Zhou Tao Li Man-Fei Wang Hua-Shun Xu Yong Kong Wei-Song Zhou Min Yang Guang-Yu Jiang Ju-Xing 《Chemistry of Natural Compounds》2022,58(3):511-515
Chemistry of Natural Compounds - Two new chromeno[3,2-c]pyridin derivatives, 8-acetyl-3-(hydroxymethyl)-7-methoxy-10H-chromeno[3,2-c]pyridin-10-one (1) and... 相似文献
88.
Haicun Yang Shuipi Cai Yu Jiang Zheng Cao Wenzhong Ma Fanghong Gong Guoliang Tao Chunlin Liu 《Journal of polymer science. Part A, Polymer chemistry》2022,60(10):1571-1587
The commonly used multi-center initiation methods always lead to the formation of quantities of homopolymer in the surface tailoring based on reverse atom transfer radical polymerization (ATRP) and reversible addition-fragmentation chain-transfer (RAFT) polymerization. In this study, a monocenter redox pair constructed of silica bearing tert-butyl hydroperoxide groups and ascorbic acid (SiO2-TBHP/AsAc) was applied to substitute the commonly used initiation method of R-supported RAFT grafting polymerization. All the propagating radicals were restricted on the surface of solid particles during the whole procedure theoretically, resulting in a higher grafting efficiency of 95.1% combined with the “controllable” feature at 10 h. This redox pair was also used to initiate the reverse ATRP in miniemulsion successfully with a grafting efficiency of 86.3% at 10 h. The grafting efficiency obtained under this monocenter initiation method was significantly higher than that of the frequently reported surface modification by reverse ATRP and RAFT polymerization. In addition, the high-efficient surface tailoring was traced and confirmed by nuclear magnetic resonance, Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis, transmission electron microscopy, and other analysis tests. The advantage of this monocenter redox pair will open a new avenue for the potential “high-efficient” surface tailoring of various materials. 相似文献
89.
Wang Hong Cai Le He Shu-Hua Zheng Xiao-Bei Liu Yu-Xia Zhang Lan 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(6):2553-2559
Journal of Radioanalytical and Nuclear Chemistry - Prostate-specific membrane antigen (PSMA) is a biomarker for prostate cancer, which is commonly used in the development of diagnostic and... 相似文献
90.
Li Kaile Li Sufen Zhang Quanhu Cai Xingfu Wang Fei 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(8):3213-3220
Journal of Radioanalytical and Nuclear Chemistry - To analyze the effect of scintillator detectors on the fast neutron multiplicity, this paper uses Geant4 and Matlab to simulate and study three... 相似文献