全文获取类型
收费全文 | 172篇 |
免费 | 6篇 |
国内免费 | 18篇 |
专业分类
化学 | 97篇 |
晶体学 | 15篇 |
力学 | 15篇 |
数学 | 13篇 |
物理学 | 56篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2016年 | 7篇 |
2015年 | 6篇 |
2014年 | 8篇 |
2013年 | 11篇 |
2012年 | 13篇 |
2011年 | 18篇 |
2010年 | 15篇 |
2009年 | 5篇 |
2008年 | 14篇 |
2007年 | 19篇 |
2006年 | 12篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有196条查询结果,搜索用时 15 毫秒
191.
饮用水水质与人体健康 总被引:6,自引:0,他引:6
水对人体是极其重要的,本文介绍了水中常量、微量元素、水的卫生、水分子簇团大小等对人体健康的重要影响,并由此谈到了自来水的消毒以及对纯净水的几点探索性认识。 相似文献
192.
Nano oxides (SiO2, CeO2, SnO2) were successfully synthesized by solid-state reactions at ambient temperature. The nanoparticles were characterized by X-ray powder diffraction, TEM, BET, and TGA-DTA. The SiO2 particles were also investigated using IR spectra. Effects of calcination on the nanoparticles were studied in this paper. The solid-state reaction technique is a convenient, inexpensive and an effective preparation method of monodisperse oxide nanoparticles in high yield. The mechanisms of the formation of nano materials by solid-state reactions at ambient temperature were primarily investigated. 相似文献
193.
194.
Dr. Yu Rao Prof. Zongkui Kou Prof. Xianghua Zhang Prof. Ping Lu 《Chemical record (New York, N.Y.)》2023,23(6):e202200251
Metal organic framework (MOF) glasses are a coordination network of metal nodes and organic ligands as an undercooled frozen-in liquid, and have therefore broadened the potential of MOF materials in the fundamental research and application scenarios. On the road to deploying MOF glasses as electrocatalysts, it remains several basic scientific hurdles although MOF glasses not only inherit the structural merits of MOFs but also endow with active catalytic features including concentrated defects, metal centers and disorder structure etc. The research on the ionic conductivity, catalytic stability and reactivity of MOF glasses has yielded scientific insights towards its electrocatalytic applications. Here, we first comb the history, definition and basic properties of MOF glasses. Then, we identify the main synthetic methods and characterization techniques. Finally, we advance the potentials and challenges of MOF glasses as electrocatalysts in furthering the understanding of these themes. 相似文献
195.
196.
Jiawen Zhu Jiaqi Cao Guolei Cai Jing Zhang Wei Zhang Shuai Xie Jinxi Wang Dr. Hongchang Jin Junjie Xu Prof. Xianghua Kong Dr. Song Jin Prof. Zhenyu Li Prof. Hengxing Ji 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2023,135(3):e202214351
Appling an electrochemical catalyst is an efficient strategy for inhibiting the shuttle effect and enhancing the S utilization of Li-S batteries. Carbon-based materials are the most common conductive agents and catalyst supports used in Li-S batteries, but the correlation between the diversity of hybridizations and sulfur reduction reaction (SRR) catalytic activity remains unclear. Here, by establishing two forms of carbon models, i.e., graphitic carbon (GC) and amorphous carbon (AC), we observe that the nitrogen atom doped in the GC possesses a higher local charge density and a lower Gibbs free energy towards the formation of polysulfides than in the AC. And the GC-based electrode consistently inherits considerably enhanced SRR kinetics and superior cycling stability and rate capability in Li-S batteries. Therefore, the function of carbon in Li-S batteries is not only limited as conductive support but also plays an unignorable contribution to the electrocatalytic activities of SRR. 相似文献