首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1013篇
  免费   0篇
化学工业   5篇
机械仪表   2篇
建筑科学   1篇
轻工业   3篇
水利工程   1篇
无线电   2篇
一般工业技术   10篇
冶金工业   983篇
自动化技术   6篇
  2023年   1篇
  2017年   1篇
  2013年   6篇
  2011年   1篇
  2010年   2篇
  2008年   2篇
  2007年   3篇
  2005年   1篇
  2003年   2篇
  1999年   27篇
  1998年   270篇
  1997年   161篇
  1996年   117篇
  1995年   55篇
  1994年   66篇
  1993年   54篇
  1992年   11篇
  1991年   10篇
  1990年   6篇
  1989年   17篇
  1988年   13篇
  1987年   14篇
  1986年   18篇
  1985年   14篇
  1984年   1篇
  1983年   4篇
  1982年   5篇
  1981年   8篇
  1980年   12篇
  1979年   1篇
  1978年   1篇
  1977年   33篇
  1976年   74篇
  1975年   1篇
  1965年   1篇
排序方式: 共有1013条查询结果,搜索用时 15 毫秒
991.
Canadian voters' reasons for following political events were assessed prior to the 1992 Constitutional Referendum and the 1993 federal election. Results showed that reasons reflecting identification were endorsed more frequently than those reflecting introjection, and distinctive patterns of cognitions, emotions, and actions were associated with the 2 types of internalization. Identification was associated with actively seeking information about political events, possessing a complex set of political attitudes, and being more likely to actually vote. Introjection was associated with relying on the influence of important others, experiencing conflicted emotions about political outcomes, and vulnerability to persuasion. The study also provided evidence that identification and introjection toward politics are distinguishable from intrinsic motivation and amotivation.  相似文献   
992.
993.
994.
995.
We describe a case of fatal overdosage with primidone and methsuximide. During the early phase of the patient's hospital course we found concentrations of methsuximide, N-desmethylmethsuximide, and primidone in serum that far exceeded the usual therapeutic concentrations, as determined by gas-liquid chromatography. Determination of N-desmethylmethsuximide in peritoneal fluid demonstrated concentrations comparable to those in serum. This led to the therapeutic decision to manage the patient by dialysis. Subsequently, serum samples collected during the course of hospitalization were analyzed quantitatively by gas-liquid chromatography for methsuximide, N-desmethylmethsuximide, primidone, phenobarbital, and diphenylhydantoin. Selected serum specimens were also analyzed by gas chromatography-mass spectrometry, and N-methyl-2-hydroxymethyl-2-phenylsuccinimide, a metabolite of methsuximide not previously described in human serum, was identified by analysis of its mass spectrum.  相似文献   
996.
A novel oleic acid ester of the carotane sesquiterpene 14-hydroxy CAF-603 was isolated from Trichoderma virens grown in a solid brown rice-based medium, a solid millet-based medium, or a mannitol-based liquid medium. Its structure was determined on the basis of ms and nmr analysis. It retains distinct biological activity on the high conductance calcium-activated potassium channel, unlike its analogues 14-hydroxy CAF-603, CAF-603 3-oleate, or CAF-603 3-linoleate.  相似文献   
997.
998.
999.
1000.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号