全文获取类型
收费全文 | 1808篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 8篇 |
金属工艺 | 5篇 |
轻工业 | 5篇 |
石油天然气 | 1篇 |
无线电 | 1篇 |
一般工业技术 | 2篇 |
冶金工业 | 1783篇 |
自动化技术 | 8篇 |
出版年
2022年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 5篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 1篇 |
2012年 | 1篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2000年 | 1篇 |
1999年 | 71篇 |
1998年 | 614篇 |
1997年 | 346篇 |
1996年 | 207篇 |
1995年 | 115篇 |
1994年 | 71篇 |
1993年 | 123篇 |
1992年 | 13篇 |
1991年 | 10篇 |
1990年 | 13篇 |
1989年 | 17篇 |
1988年 | 11篇 |
1987年 | 13篇 |
1986年 | 9篇 |
1985年 | 6篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1980年 | 16篇 |
1978年 | 3篇 |
1977年 | 27篇 |
1976年 | 73篇 |
1975年 | 3篇 |
1954年 | 1篇 |
排序方式: 共有1814条查询结果,搜索用时 31 毫秒
101.
102.
103.
104.
A Bizzi E Veneroni MT Tacconi AM Codegoni R Pagani M Cini S Garattini 《Canadian Metallurgical Quarterly》1980,5(3-4):227-240
Liquipron and Toprina, obtained by growing yeasts (Candida maltosa and Candida lipolytica) on n-hydrocarbons, were investigated to ascertain the biological significance and possible toxicological implications of their high content of uneven fatty acids (UFA). It was confirmed that the extent to which UFA accumulate in adipose tissue of rats fed the 2 products reflects only partially their UFA contents. The presence of UFA in rat tissues does not appear to alter intermediate metabolism. The capacity of liver mitochondria ot oxidize palmitic acid was similar in control and in Liquipron-treated rats. Palmitic acid and heptadecanoic acid did not compete for oxidation when mixed at concentrations which reflect their presence in the tissues of animals fed high levels of Liquipron. 相似文献
105.
106.
107.
108.
Radium analysis is carried out by batch adsorption from natural waters on basic lead rhodizonate supported on charcoal, LERHO, starting from 2-L samples. 133Ba is added to allow the measurement of the overall chemical yield by gamma counting. Radium is recovered with a few milliliters of 1.5 M HCl, and lead is removed by a chromatographic column filled with Dowex 2 x 8. Finally 50 micrograms of barium carrier is added, and the radium is coprecipitated as sulfate on a preformed bed of barium sulfate, to prepare a sample suitable for alpha and gamma counting. The detection limit of the proposed method is 0.002 Bq/L 226Ra. This value is far beyond the radium activity admissible for drinking waters. Due to lack of appropriate samples, the procedure was tested using mineral waters spiked with 226Ra and two commercially available mineral waters with very low radium contents. 相似文献
109.
110.