全文获取类型
收费全文 | 3529篇 |
免费 | 1篇 |
专业分类
化学工业 | 8篇 |
金属工艺 | 2篇 |
机械仪表 | 2篇 |
建筑科学 | 9篇 |
矿业工程 | 2篇 |
轻工业 | 31篇 |
石油天然气 | 1篇 |
无线电 | 4篇 |
一般工业技术 | 3篇 |
冶金工业 | 3455篇 |
自动化技术 | 13篇 |
出版年
2019年 | 2篇 |
2017年 | 3篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 2篇 |
2008年 | 4篇 |
2007年 | 1篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1999年 | 98篇 |
1998年 | 940篇 |
1997年 | 575篇 |
1996年 | 359篇 |
1995年 | 201篇 |
1994年 | 190篇 |
1993年 | 211篇 |
1992年 | 34篇 |
1991年 | 52篇 |
1990年 | 58篇 |
1989年 | 64篇 |
1988年 | 64篇 |
1987年 | 66篇 |
1986年 | 58篇 |
1985年 | 55篇 |
1983年 | 10篇 |
1982年 | 21篇 |
1981年 | 24篇 |
1980年 | 36篇 |
1979年 | 4篇 |
1978年 | 13篇 |
1977年 | 105篇 |
1976年 | 227篇 |
1975年 | 10篇 |
1973年 | 1篇 |
1971年 | 2篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 4篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1961年 | 2篇 |
1960年 | 1篇 |
1955年 | 3篇 |
排序方式: 共有3530条查询结果,搜索用时 8 毫秒
151.
RL Baldwin 《Canadian Metallurgical Quarterly》1976,46(4):27-32
Solid dispersions of naltrexone in natural glycerides were used to form injectable implants which continuously release narcotic antagonists in vivo. The dispersions were formed and tested either as small cylindrical pellets, e.g. l x 3.0 mm in size, or as particles with diameters in size ranges between 125-250 mu, that are suspended in an aqueous methyl cellulose solution. Both types of implants delivered naltrexone to mice at rates that were effective in blocking the antiociceptive action of morphine for at least one month. The rate of naltrexone release was controlled by altering its concentration in the dispersion and by varying the glyceride composition. Degradation and absorption of the implants were found to depend on their composition, dimensions and location in the body. No appreciable tissue incompatibility was seen in mice, rats, rabbits, monkeys and swine, even when long-lasting preparations were removed a year after treatment. 相似文献
152.
153.
154.
155.
156.
Cluster analysis was used to identify two homogeneous clusters of 8-9 1/2-year-old children who misarticulated /s/, /r/, or both. The analysis was based on the children's scores on 40 measures of language, reading, auditory processing, and other variables. Discriminant function analysis was then used to identify a subset of five measures and a means of computing classification scores. These measures and the classification scores can be used to identify the cluster membership of new subjects. The use of classification scores for identifying cluster membership was cross-validated against cluster analysis of a second group of children. The two clusters are described in terms of their performance on language and reading measures. 相似文献
157.
158.
159.
160.