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   316篇
  免费   11篇
各国政治   23篇
工人农民   17篇
世界政治   47篇
外交国际关系   14篇
法律   150篇
中国政治   3篇
政治理论   71篇
综合类   2篇
  2023年   4篇
  2022年   1篇
  2021年   2篇
  2020年   4篇
  2019年   10篇
  2018年   7篇
  2017年   11篇
  2016年   11篇
  2015年   5篇
  2014年   5篇
  2013年   45篇
  2012年   9篇
  2011年   14篇
  2010年   7篇
  2009年   4篇
  2008年   7篇
  2007年   12篇
  2006年   11篇
  2005年   6篇
  2004年   9篇
  2003年   10篇
  2002年   7篇
  2001年   11篇
  2000年   12篇
  1999年   12篇
  1998年   11篇
  1997年   5篇
  1996年   4篇
  1995年   6篇
  1994年   5篇
  1993年   2篇
  1992年   8篇
  1991年   4篇
  1989年   7篇
  1988年   2篇
  1987年   2篇
  1986年   6篇
  1985年   7篇
  1984年   1篇
  1982年   5篇
  1981年   2篇
  1980年   2篇
  1979年   3篇
  1978年   3篇
  1977年   2篇
  1976年   1篇
  1974年   2篇
  1973年   1篇
排序方式: 共有327条查询结果,搜索用时 15 毫秒
111.
112.
In recent months, there has been increased reporting of seized drug and toxicology cases containing rodenticides, the active ingredient in rat poisons. Seeing as rodenticides are not scheduled substances, they are not commonly screened for in seized drug analysis. This work investigates the use of TD‐DART‐MS for the simultaneous detection of rodenticides and drugs. Six rodenticides were evaluated, an optimal method was established, and limits of detection in the tens of nanograms were calculated. Additional studies highlight that detection at less than 1% by weight in mixtures with AB‐FUBINACA, cocaine, heroin, or methamphetamine was possible. This work presents an optimized method for detection of these compounds, allowing for the simultaneous detection of drugs and rodenticides, providing drug chemists with a tool for rapid identification of these compounds for forensic or public health purposes.  相似文献   
113.
114.
115.
116.
117.
Newsgathering often requires journalists to ask uncomfortable questions or make multiple attempts to talk to unwilling sources. Some journalists have been accused of harassment, even when the plain language of state laws would not classify their actions as criminal conduct. In the rare instances that journalists actually were charged with harassment or subject to protective orders for stalking, district attorneys or judges typically did not allow them to be punished. This study, however, found nine statutes that might be applied to punish newsgathering activities that are neither hounding nor harassing. It also identifies language from statutes that clearly could not be applied to punish newsgathering communications by journalists. The article recommends that prosecutors and judges continue to prevent the application of criminal harassment and stalking laws to newsgathering activities.  相似文献   
118.
Death in the dental chair   总被引:1,自引:0,他引:1  
Death during dental anesthesia is relatively rare. Review of eight such cases which occurred in our county, including the different anesthetics used, revealed one apparent basic pattern that prevailed...a need for awareness that something might go wrong and recognition of the fact that it was going wrong.  相似文献   
119.
120.
This article examines two examples of what has been called mandated science - risk analysis and long-term energy demand forecasting - with a view to disentangling the implicit assumptions underlying their use in public policy debates and in the policy process. In both fields, there has emerged a growing and very similar challenge to traditional views of the role and status of mandated science in informing decision-making. This challenge has led to the reformulation of some of the attributes of the standard view, without however causing changes in the underlying view of the nature of the problem or the role of science in principle. A deeper critique suggests that mandated science is inherently value-laden, producing conclusions that are strongly affected by theoretical presuppositions that in turn reflect underlying values (e.g., about rationality, knowledge or the role of technology). Thus a sharp separation of science and policy is untenable and amounts to a hidden policy bias in favor of the business-as-usual policies supported by conventional science. There is a need for a new concept of science, one that is more integrated into the policy context, more contextual and openly value-laden, less oriented to mastery over natural and social processes, and more accessible to the public at large.  相似文献   
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