全文获取类型
收费全文 | 152663篇 |
免费 | 32528篇 |
国内免费 | 9341篇 |
专业分类
化学 | 121699篇 |
晶体学 | 1127篇 |
力学 | 8954篇 |
综合类 | 469篇 |
数学 | 21348篇 |
物理学 | 40935篇 |
出版年
2024年 | 331篇 |
2023年 | 5558篇 |
2022年 | 3320篇 |
2021年 | 5371篇 |
2020年 | 7965篇 |
2019年 | 5607篇 |
2018年 | 6174篇 |
2017年 | 4582篇 |
2016年 | 10118篇 |
2015年 | 9879篇 |
2014年 | 10054篇 |
2013年 | 11768篇 |
2012年 | 13811篇 |
2011年 | 11004篇 |
2010年 | 10489篇 |
2009年 | 10010篇 |
2008年 | 7037篇 |
2007年 | 6186篇 |
2006年 | 5038篇 |
2005年 | 8014篇 |
2004年 | 6669篇 |
2003年 | 4491篇 |
2002年 | 2550篇 |
2001年 | 2041篇 |
2000年 | 1678篇 |
1999年 | 1908篇 |
1998年 | 1554篇 |
1997年 | 1554篇 |
1996年 | 1530篇 |
1995年 | 1347篇 |
1994年 | 1160篇 |
1993年 | 1092篇 |
1992年 | 1019篇 |
1991年 | 878篇 |
1990年 | 744篇 |
1989年 | 605篇 |
1988年 | 591篇 |
1987年 | 452篇 |
1986年 | 398篇 |
1985年 | 371篇 |
1977年 | 394篇 |
1976年 | 504篇 |
1975年 | 539篇 |
1974年 | 560篇 |
1973年 | 399篇 |
1972年 | 507篇 |
1971年 | 445篇 |
1970年 | 663篇 |
1969年 | 497篇 |
1968年 | 526篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
31.
Yi-Tong Xu Tian-Yang Zhang Zheng Li Xiang-Nan Liu Yuan-Cheng Zhu Wei-Wei Zhao Hong-Yuan Chen Jing-Juan Xu 《Electroanalysis》2022,34(6):947-955
Photoelectrochemical (PEC) cytosensors, a combination of the PEC process and the living-cell assay, have emerged as a powerful tool in the analytical and biological science. This mini review provides a brief introduction of this arena and summaries the key steps about the development of PEC cytosensors with representative examples, followed by future prospects based on our own opinions. 相似文献
32.
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
33.
Haruki Inoue Dr. Shin-ichi Naya Atsunobu Akita Dr. Hisashi Sugime Prof. Dr. Hiroaki Tada 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(46):e202201653
Gold nanoparticles with different mean sizes were formed on antimony-doped tin oxide nanocrystals by the temperature-varied deposition-precipitation method (Au/ATO NCs). Au/ATO NCs possess strong absorption in the near-infrared region due to Drude excitation in addition to the localized surface plasmon resonance (LSPR) of AuNPs around 530 nm. Au/ATO NCs show thermally activated catalytic activity for the oxidation of cinnamyl alcohol to cinnamaldehyde by hydrogen peroxide. The catalytic activity increases with a decrease in the mean Au particle size (dAu) at 5.3 nm≤dAu≤8.2 nm. Light irradiation (λex >660 nm, ∼0.5 sun) of Au/ATO NCs increases the rate of reaction by more than twice with ∼95 % selectivity. Kinetic analyses indicated that the striking enhancement of the reaction stems from the rise in the temperature near the catalyst surface of ∼30 K due to the photothermal effect of the ATO NCs. 相似文献
34.
35.
Li Jun Zheng Dayong Wei Ning Sun Yunfeng Liu Li Yuan Yuan Jiang Qinghua 《Chemistry of Natural Compounds》2022,58(4):650-652
Chemistry of Natural Compounds - A new quassinoid, dehydrobruceantinol B (1), was isolated from the seeds of Brucea javanica, together with two known compounds, bruceantinol (2) and bruceine A (3).... 相似文献
36.
Mathematical Programming - We seek tight bounds on the viable parallelism in asynchronous implementations of coordinate descent that achieves linear speedup. We focus on asynchronous coordinate... 相似文献
37.
Wei Yuting Wang Qihua Liu Wei 《Annals of the Institute of Statistical Mathematics》2021,73(3):535-553
Annals of the Institute of Statistical Mathematics - In this paper, a model averaging approach is developed for the linear regression models with response missing at random. It is shown that the... 相似文献
38.
Xu Mengtao Li Changyou Sun Yang Yang Tianzhi Zhang Hongzhuang Liu Zhendong Liu Haiyang Li Zhenyuan Zhang Yimin 《Nonlinear dynamics》2021,105(4):3061-3092
Nonlinear Dynamics - Investigation of the dynamic characteristics of linear guideway is essential for enhancing structural performance of machine tools. However, few mechanical models are... 相似文献
39.
40.
Interactions of the vector breathers for the coupled Hirota system with $$4\times 4$$ 4 × 4 Lax pair
Nonlinear Dynamics - In this paper, we investigate the interactions of the vector breathers for the coupled Hirota system with $$4\times 4$$ Lax pair. Firstly, we give the first-order breather... 相似文献