首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   225篇
  免费   12篇
  国内免费   2篇
化学   179篇
晶体学   1篇
力学   9篇
数学   16篇
物理学   34篇
  2023年   4篇
  2022年   3篇
  2021年   10篇
  2020年   11篇
  2019年   13篇
  2018年   19篇
  2017年   10篇
  2016年   16篇
  2015年   10篇
  2014年   17篇
  2013年   36篇
  2012年   20篇
  2011年   22篇
  2010年   13篇
  2009年   8篇
  2008年   6篇
  2007年   7篇
  2006年   5篇
  2005年   1篇
  2004年   2篇
  2000年   1篇
  1998年   1篇
  1997年   1篇
  1995年   1篇
  1990年   1篇
  1983年   1篇
排序方式: 共有239条查询结果,搜索用时 15 毫秒
191.
192.
Research on Chemical Intermediates - An efficient, one-pot, three-component synthesis of some novel heteroaryl aminoindandione derivatives using ninhydrin, various heteroaryl amines, and...  相似文献   
193.
Journal of Sol-Gel Science and Technology - Preventing the growth of potentially deadly bacteria by newly synthesized nanoparticles (NPs) is of great importance in the development of future drugs....  相似文献   
194.
Journal of Fluorescence - In this work, novel Fe/ZnO nanocomposites (NCs) and Fe nanoparticles loaded onto porous ZnO nanostructures have been synthesized via a simple biotechnological route by...  相似文献   
195.
196.
A phenoxybutane‐based Schiff base complex of cis‐dioxo‐Mo(VI) was supported on paramagnetic nanoparticles and characterized using powder X‐ray diffraction, infrared, diffuse reflectance and atomic absorption spectroscopies, scanning and transmission electron microscopies and vibrating sample magnetometry. The separable nanocatalyst was tested for the selective epoxidation of cyclohexene, cyclooctene, styrene, indene, α‐pinene, 1‐octene, 1‐heptene, 1‐dodecene and trans‐stilbene using tert‐butyl hydroperoxide (80% in di‐tert‐butyl peroxide–water, 3:2) as oxidant in chloroform. The catalyst was efficient for oxidation of cyclooctene with 100% selectivity for epoxidation with 98% conversion in 10 min. We were able to separate magnetically the nanocatalyst using an external magnetic field and used the catalyst at least six successive times without significant decrease in conversion. The turnover frequency of the catalyst was remarkable (2556 h?1 for cyclooctene). The proposed nanomagnetic catalyst has advantages in terms of catalytic activity, selectivity, catalytic reaction time and reusability by easy separation.  相似文献   
197.
198.
The aim of this letter is to confirm the achievements in [1] and answer all the mentioned comments in [2]. Meanwhile some other drawbacks in the comment paper [2] are also presented in this paper.  相似文献   
199.
Journal of Thermal Analysis and Calorimetry - Transfer of heat and mass and thermodynamic irreversibilities are investigated in a porous, parallel-plate microreactor in which the working fluid is...  相似文献   
200.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号