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   122篇
  免费   10篇
各国政治   17篇
工人农民   4篇
世界政治   9篇
外交国际关系   15篇
法律   50篇
政治理论   32篇
综合类   5篇
  2023年   4篇
  2021年   2篇
  2020年   2篇
  2019年   12篇
  2018年   3篇
  2017年   9篇
  2016年   5篇
  2015年   6篇
  2014年   9篇
  2013年   23篇
  2012年   4篇
  2011年   2篇
  2010年   7篇
  2009年   2篇
  2008年   3篇
  2007年   1篇
  2006年   2篇
  2005年   1篇
  2004年   2篇
  2003年   4篇
  2002年   3篇
  2001年   2篇
  2000年   2篇
  1999年   1篇
  1998年   2篇
  1996年   1篇
  1995年   3篇
  1993年   2篇
  1992年   2篇
  1991年   2篇
  1990年   1篇
  1989年   1篇
  1985年   1篇
  1982年   1篇
  1978年   1篇
  1973年   1篇
  1972年   1篇
  1967年   1篇
  1965年   1篇
排序方式: 共有132条查询结果,搜索用时 15 毫秒
21.
Abstract: The design and preliminary characterization of a novel sensor for drugs of abuse, DETECHIP®, is described in this proof‐of‐concept note. Combining both colorimetric and fluorimetric assays, DETECHIP® is suitable for lab and field use. More than a conventional spot test which provides a single “yes or no” answer, DETECHIP® provides twenty responses for a more complete characterization of suspect material. This is accomplished by visually noting colorimetric and fluorescent changes of carefully selected dyes upon the addition of test analytes, including drugs of abuse, with respect to controls. Color and fluorescence changes are recorded numerically so that a 20 digit identification code can be constructed for comparison of test analytes and known compounds. DETECHIP® is applicable to a variety of drugs, both plant‐derived and synthetic, addressing the need to use several different spot tests simultaneously for a single sample.  相似文献   
22.
In October and November 2001, the Pentagon purchased the rights to all images of Afghanistan taken by the Ikonos remote sensing satellite, a high-resolution satellite owned and operated by Space Imaging, Inc. Ikonos is one of a growing number of privately owned and operated remote sensing satellites. It is suggested that Ikonos and other high-resolution satellites carry at least two challenges to national security policy makers. The first is a challenge to operational security – the ability to plan, prepare and carry out military operations in a controlled information environment. Second, commercial remote sensing presents a political challenge to policy makers. Policy makers today face a greater challenge in their efforts to maintain control over the content of debate concerning national and international security priorities and objectives. It is argued here that the nature of the security policy debate itself is in the midst of a fundamental shift in tone and quality as a result of remote sensing satellite technology. It was principally this latter challenge – and not a concern over operational security – that led to the Pentagon's purchase of all Ikonos images during the opening phases of the war in Afganistan.  相似文献   
23.
Tony Shaw, Eden, Suez and the Mass Media (London: I.B. Tauris 1996). Pp.xi + 268, biblio., index. £39.50. ISBN 1–85043–955–9.

Hoda Gamal Abdel Nasser, Britain and the Egyptian Nationalist Movement, 1936–1952 (Reading, UK: Ithaca Press 1994). Pp.xxv + 350, biblio., index. £30. ISBN 0–86372‐ 177‐X.

Andrew Rathmell, Secret War in the Middle East: The Covert Struggle for Syria, 1949–1961 (London: I.B. Tauris 1995). Pp.246, biblio., index. £39.50. ISBN 1–85043–992–3.  相似文献   
24.
25.
26.
Gonzalez  Lucas I. 《Publius》2008,38(2):211-247
What factors shape decentralization processes in Latin Americanfederations? This work reviews and statistically analyzes currentapproaches on the topic, questions some claims of generalityin their theoretical frameworks, and presents an argument toexplain variation in decentralization processes across thesefederations. The main hypothesis is that the degree of decentralization(in fiscal and administrative terms) in Latin American federationshas been shaped by the political power of the national executiveand sub-national actors and the fiscal context in which theyinteract. The article presents statistical evidence (for federaland unitary countries between 1979 and 1998) to sustain someof the expectations in the argument and discusses some of itslimitations.  相似文献   
27.
28.
29.
30.
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