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   710篇
  免费   37篇
各国政治   71篇
工人农民   37篇
世界政治   118篇
外交国际关系   53篇
法律   291篇
中国政治   15篇
政治理论   161篇
综合类   1篇
  2023年   9篇
  2022年   5篇
  2021年   8篇
  2020年   19篇
  2019年   25篇
  2018年   29篇
  2017年   35篇
  2016年   35篇
  2015年   15篇
  2014年   20篇
  2013年   144篇
  2012年   18篇
  2011年   23篇
  2010年   24篇
  2009年   20篇
  2008年   25篇
  2007年   23篇
  2006年   19篇
  2005年   31篇
  2004年   17篇
  2003年   22篇
  2002年   30篇
  2001年   13篇
  2000年   14篇
  1999年   5篇
  1998年   14篇
  1997年   4篇
  1996年   9篇
  1995年   6篇
  1994年   8篇
  1992年   4篇
  1991年   8篇
  1990年   4篇
  1989年   6篇
  1988年   2篇
  1987年   3篇
  1985年   4篇
  1984年   5篇
  1983年   7篇
  1982年   2篇
  1981年   3篇
  1980年   3篇
  1979年   2篇
  1978年   3篇
  1977年   2篇
  1976年   2篇
  1975年   3篇
  1974年   3篇
  1968年   2篇
  1966年   2篇
排序方式: 共有747条查询结果,搜索用时 15 毫秒
41.
The use of a new technique, Fourier transform infrared (FTIR) chemical imaging, has been demonstrated for the enhancement of latent fingermarks on a number of surfaces. Images of untreated fingermarks on glass backgrounds with excellent ridge detail were acquired using infrared chemical imaging. High quality fingermarks on glass backgrounds were also developed using ethyl cyanoacrylate (super glue) fuming and subsequent infrared chemical imaging. This new method allows the collection of images from backgrounds that traditionally pose problems for current fingermark detection methods. The background may, for example, be highly colored, have a complex pattern, or possess other pattern or image characteristics that make it difficult to separate fingermark ridges using traditional optical or luminescent visualization. One background that has proven to be a challenging surface for the development of latent fingermarks is the Australian polymer banknote. To demonstrate the power and applicability of infrared chemical imaging, fingermarks fumed with ethyl cyanoacrylate were successfully imaged from Australian polymer banknotes.  相似文献   
42.
43.
44.
45.
No consensus yet exists on how to handle incidental findings (IFs) in human subjects research. Yet empirical studies document IFs in a wide range of research studies, where IFs are findings beyond the aims of the study that are of potential health or reproductive importance to the individual research participant. This paper reports recommendations of a two-year project group funded by NIH to study how to manage IFs in genetic and genomic research, as well as imaging research. We conclude that researchers have an obligation to address the possibility of discovering IFs in their protocol and communications with the IRB, and in their consent forms and communications with research participants. Researchers should establish a pathway for handling IFs and communicate that to the IRB and research participants. We recommend a pathway and categorize IFs into those that must be disclosed to research participants, those that may be disclosed, and those that should not be disclosed.  相似文献   
46.
47.
48.
This article reviews the December 2007 United Nations Climate Change Conference in Bali. It considers expectations for the meeting and whether the event delivered on these expectations. It also evaluates the long-term context of the meeting and examines the discussions in Bali on the post-2012 period (when the Kyoto Protocol's first 'commitment period' expires). The article finds that the Bali meeting did not necessarily meet public expectations or respond directly to the latest scientific assessments calling for urgent action. However, the article also finds that Bali was successful in the context of the prevailing political and diplomatic realities and the immense complexity of the climate change challenge – a problem that does not lend itself to a 'quick fix' solution. The article concludes that Bali produced a solid outcome that gives direction to future talks and sets a clear deadline for their completion. Finally, it argues that, contrary to some experts' opinion, the lack of detail in the Bali outcome may prove to be a strength rather than a weakness, since it provides flexibility to negotiators as they try to craft a consensus by the end of 2009.  相似文献   
49.
The comparison of consecutively manufactured tools and firearms has provided much, but not all, of the basis for the profession of firearm and toolmark examination. The authors accept the fundamental soundness of this approach but appeal to the experimental community to close two minor gaps in the experimental procedure. We suggest that “blinding” and attention to appropriateness of other experimental conditions that would consolidate the foundations of our profession. We do not suggest that previous work is unsound.  相似文献   
50.
The article concentrates on the police role in the investigative stage in various criminal justice systems and the relationship with each national prosecution service. It is shown that in this respect the police function varies significantly from country to country. According to its legal competencies and factual procedural possibilities, the article will give a short overview of the national differences but also show that similar mechanisms are developed.  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