全文获取类型
收费全文 | 243篇 |
免费 | 4篇 |
专业分类
化学 | 146篇 |
力学 | 4篇 |
数学 | 48篇 |
物理学 | 49篇 |
出版年
2018年 | 2篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 10篇 |
2012年 | 12篇 |
2011年 | 22篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 16篇 |
2007年 | 12篇 |
2006年 | 12篇 |
2005年 | 8篇 |
2004年 | 8篇 |
2003年 | 9篇 |
2002年 | 12篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 7篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 5篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1974年 | 1篇 |
1973年 | 8篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1965年 | 1篇 |
1961年 | 1篇 |
1959年 | 2篇 |
1954年 | 1篇 |
排序方式: 共有247条查询结果,搜索用时 46 毫秒
201.
202.
203.
Qiu‐Cheng Chen Matan Soll Dr. Amir Mizrahi Dr. Irena Saltsman Dr. Natalia Fridman Prof. Magal Saphier Prof. Zeev Gross 《Angewandte Chemie (International ed. in English)》2018,57(4):1006-1010
Corrole and sapphyrin with the smallest meso‐substituents reported so far were prepared in a one‐pot synthesis that relies on a non‐aldehydic precursor for introducing CF3 groups. The substantial amounts of products obtained by this facile pathway allowed for the full characterization of 5,10,15‐tris(trifluoromethyl)corrole, the access to a variety of stable chelates thereof and investigations that disclose the unique structural and chemical properties induced by the CF3 substituents. The novel 5,10,15,20‐tetra(trifluoromethyl)sapphyrin undergoes only single protonation, which according to its crystal structure is stabilized by favorable non‐bonding F/H interaction between the meso‐CF3 and the inverted pyrrolic NH. 相似文献
204.
The reactions of phosgene with 5,10,15-tris(pentafluorophenyl)corrole and its gallium(III) complex lead to a novel chiral macrocycle and an amphiphilic corrole, respectively. Both types of molecules were fully characterized by spectroscopy and X-ray crystallography. 相似文献
205.
Vijay Bhooshan Kumar Prof. Aharon Gedanken Prof. David Avnir Dr. Ze'ev Porat 《Chemphyschem》2016,17(1):162-169
This work examines the concept of dispersing polymers in metals. Herein, this was mainly studied with molten gallium, in which 5‐18 wt % of various short‐chain polymers were incorporated and mixed. The nature of the solidified products was examined by using X‐ray diffraction, electron microscopy, UV/Vis, differential scanning calorimetry, and thermal gravimetric analyses. It was found that some polymers can be dispersed as small domains within molten metals to form a heterogeneous solid. The ability to dope Ga with large polymers opens a new avenue to electronic materials. 相似文献
206.
207.
208.
209.
The kinetics of gamma-radiation-induced free-radical reactions in carbon tetrachloride solutions of ethanol and n-pentanol were studied in the range of 0.05–0.80M and 25–170°C. The rate constant for the reaction was found as The activation energy is larger by 0.8 kcal/mol than for secondary alcohols, while the A1 factors are about the same. 相似文献
210.