全文获取类型
收费全文 | 145篇 |
免费 | 5篇 |
国内免费 | 2篇 |
专业分类
化学 | 134篇 |
力学 | 2篇 |
数学 | 8篇 |
物理学 | 8篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 5篇 |
2019年 | 11篇 |
2018年 | 4篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 8篇 |
2014年 | 4篇 |
2013年 | 8篇 |
2012年 | 7篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 4篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 7篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 2篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有152条查询结果,搜索用时 875 毫秒
151.
Zolfigol Mohammad Ali Khazaei Ardeshir Mokhlesi Mohammad Zare Abdolkarim Safaiee Maliheh Derakhshan‐Panah Fatemeh Keypour Hassan Ali Dehghani‐Firouzabadi Ahmad Merajoddin Maria 《中国化学》2012,30(2):345-352
Aluminum chloride (AlCl3) efficiently catalyzes one‐pot multicomponent condensation of enolizable ketones or alkyl acetoacetates with aldehydes, acetonitrile and acetyl chloride to afford β‐acetamido ketone or ester derivatives in high to excellent yields and in relatively short reaction times. Moreover, by this synthetic method, some novel β‐acetamido ketones and esters (i.e. one complex structure) are prepared. 相似文献
152.
In-cuvette mixing and titration techniques have been used for the kinetic determination of sulfide based on its inhibition
effect on the oxidation of indigo carmine with hexacyanoferrate(III) in the presence of silver. The reaction was monitored
spectrophotometrically by measuring the decrease in absorbance of indigo carmine at 612 nm. Both initial rate and fixed-time
methods were applied to the in-cuvette technique. Using in-cuvette mixing, sulfide up to 1800 ng was determined and detection
limit and relative standard deviation for the determination of 120 ng of sulfide were calculated as 23.0 ng and 1.59%, respectively.
On the basis of the titration technique, the upper limit of determination was 25 μg of sulfide and detection limit and average
relative standard deviation for the determination of 1 μg of sulfide were 0.025 μg and 4.95%, respectively. The effect of
foreign ions on the sulfide determination was studied. The proposed methods were applied to the determination of sulfide in
water.
Received: 10 March 1999 / Revised: 9 June 1999 / Accepted: 12 June 1999 相似文献