全文获取类型
收费全文 | 649篇 |
免费 | 75篇 |
国内免费 | 90篇 |
专业分类
化学 | 413篇 |
晶体学 | 35篇 |
力学 | 5篇 |
综合类 | 1篇 |
物理学 | 158篇 |
综合类 | 202篇 |
出版年
2023年 | 3篇 |
2022年 | 22篇 |
2021年 | 8篇 |
2020年 | 10篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 19篇 |
2016年 | 24篇 |
2015年 | 16篇 |
2014年 | 22篇 |
2013年 | 54篇 |
2012年 | 37篇 |
2011年 | 35篇 |
2010年 | 23篇 |
2009年 | 26篇 |
2008年 | 36篇 |
2007年 | 49篇 |
2006年 | 37篇 |
2005年 | 47篇 |
2004年 | 37篇 |
2003年 | 29篇 |
2002年 | 39篇 |
2001年 | 31篇 |
2000年 | 23篇 |
1999年 | 26篇 |
1998年 | 21篇 |
1997年 | 13篇 |
1996年 | 14篇 |
1995年 | 22篇 |
1994年 | 17篇 |
1993年 | 15篇 |
1992年 | 4篇 |
1991年 | 10篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有814条查询结果,搜索用时 15 毫秒
801.
In this work submicron barium sulfate (BaSO4) particles were synthesized successfully by chemical precipitation technique. We focused on the effects of pH and additives on the size and morphology of BaSO4 crystals. Polyacrylic acid, polyvinyl sulfonic acid and ethylenediaminetetraacetic acid were used as crystal growth modifiers. BaSO4 crystals were characterized using scanning electron microscopy, X‐ray diffraction, and Fourier transform infrared resonance techniques. The results show that the submicron BaSO4 particles have been synthesized successfully and the particle size of the barium sulfate was effectively controlled under the experimental conditions. Experimental studies revealed that the additive concentration and pH had great effect on the morphology and size of barium sulfate. 相似文献
802.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
803.
804.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
805.
The electronic structure, electronic charge density, and band gaps of Ba2MYTe5 (M: Ga, In) single crystals are simulated using the full potential linearized augmented plane wave package WIEN2k. 相似文献
806.
Dajana Durach Lukas Neudert Peter J. Schmidt Oliver Oeckler Wolfgang Schnick 《ChemInform》2015,46(39):no-no
Agglomerates of a few μm of the yellow phosphor La3BaSi5N9O2:Ce3+ are obtained by heating a mixture of LaF3, La(NH2)3, BaH2, Si(NH)2, and CeF3 in a radio frequency furnace under N2 (1600 °C, 10 h; cooling to 900 °C within 44 h). 相似文献
807.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
808.
809.
810.