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   2637篇
  免费   45篇
各国政治   131篇
工人农民   66篇
世界政治   157篇
外交国际关系   68篇
法律   1928篇
中国政治   21篇
政治理论   294篇
综合类   17篇
  2020年   30篇
  2019年   24篇
  2018年   25篇
  2017年   34篇
  2016年   41篇
  2015年   24篇
  2014年   40篇
  2013年   192篇
  2012年   62篇
  2011年   71篇
  2010年   38篇
  2009年   35篇
  2008年   58篇
  2007年   73篇
  2006年   73篇
  2005年   75篇
  2004年   74篇
  2003年   71篇
  2002年   70篇
  2001年   156篇
  2000年   123篇
  1999年   76篇
  1998年   26篇
  1995年   18篇
  1994年   22篇
  1993年   21篇
  1992年   63篇
  1991年   69篇
  1990年   61篇
  1989年   84篇
  1988年   83篇
  1987年   72篇
  1986年   76篇
  1985年   65篇
  1984年   35篇
  1983年   41篇
  1982年   19篇
  1981年   30篇
  1979年   28篇
  1978年   21篇
  1977年   27篇
  1976年   19篇
  1975年   31篇
  1974年   30篇
  1973年   31篇
  1972年   32篇
  1971年   24篇
  1970年   20篇
  1969年   24篇
  1968年   20篇
排序方式: 共有2682条查询结果,搜索用时 78 毫秒
991.
The nexus with transnational organized crime is increasingly a focus for security planners in their analyses of terror groups. Their approach is best described by the phrase “methods, not motives.” While the motives of terrorists and organized criminals remain divergent most often, our research indicates this is not always the case. For that reason, this report argues that such a general approach has become too restrictive and can be misleading since the interaction between terrorism and organized crime is growing deeper and more complex all the time. In short, the lines of separation are no longer unequivocal. The report analyzes the relationship between international organized crime and terrorism in a systematic way in order to highlight the shortcomings of the “methods, not motives” argument. In so doing, the report considers the factors that most closely correspond to crime-terror interaction and identifies those regions of developed and developing states most likely to foster such interactions. Likewise, the paper will suggest an evolutionary spectrum of crime-terror interactions that serves as a common basis for discussion of such often used terms as “nexus.” The centerpiece of the report is a groundbreaking methodology for analysts and investigators to overcome this growing complexity, identify crime-terror interactions more quickly and to assess their importance with confidence. The approach is derived from a standard intelligence analytical framework, and has already proven its utility in law enforcement investigations. The report is the product of a recently concluded and peer-reviewed 18-month NIJ sponsored research project, and includes empirical evidence drawn from numerous case studies developed in the course of the research program. This project was supported by Grant No. 2003-IJ-CX-1019 awarded by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice. Points of view in this document are those of the authors and do not necessarily represent the official position or policies of the US Department of Justice. Research assistance on this project was provided by Allison Irby, Douglas M. Hart, Patricia A. Craig-Hart, Dr. Phil Williams, Steven Simon, Nabi Abdullaev, and Bartosz Stanislawski. Drafting and editing help was provided by Laura Covill.  相似文献   
992.
993.
994.
995.
The genetically determined polymorphism of alpha 2 HS-glycoprotein was analyzed by immunoblotting ultrathin-layer polyacrylamide gel isoelectric focusing in the pH range 4-6.5 and neuraminidase pretreated sera. In a Libyan population sample from Tripoli (n = 110) three common phenotypes, alpha 2 HSG 1-1, 2-1, and 2-2, were observed. The allele frequencies were alpha 2 HSG1 = 0.8364 and alpha 2 HSG2 = 0.1636. The theoretical exclusion rate in cases of disputed paternity is 11.8%.  相似文献   
996.
With the Comprehensive Anti-apartheid Act of 1986, Congress instituted economic sanctions against South Africa, thereby reversing the historic course of U. S. foreign policy. This political innovation constituted a great victory for minority interests. This article utilizes the agenda-setting literature to examine the relationship between Anti-apartheid movement activity in the United States and adoption of economic sanctions against South Africa. The analysis is based upon an events data set consisting of 1353 events appearing in the New York Times between 1960 and 1986, interviews with activists and legislators, and archived materials. The ar- ticle concludes that although the Anti-apartheid movement was only in- directly involved in moving sanctions legislation to the policy agenda, the movement exerted direct influence in the policy process once the legislation had agenda status.  相似文献   
997.
The paper gives the results of tests for influence of luminol solution of different composition on detectability of haptoglobin fractions in the bloodstains of different ages. It was stated that alkaline luminol solutions reduce intensity of fractions and may hamper Hp phenotype determination especially in old stains.  相似文献   
998.
999.
1000.
Asbestos, a fibrous mineral, has unique physical and chemical properties, including resistance to heat, acids, and other chemicals; flexibility; and great tensile strength. The fibers subdivide into unit fibrils of molecular dimensions, resulting in a vast mineral surface area which has a direct bearing on its unusual features and its numerous applications. Its biological effects, which include fibrogenesis and carcinogenesis, may be related to the cellular reaction, to its large specific surface, or to the size and shape of the fibers. Its oncogenic action may be multiplied by other carcinogens, principally cigarette smoking. There is clinical, pathologic, and epidemiologic evidence that exposure to asbestos, following a long latent period, constitutes an important health hazard. Direct occupational exposure, followed by a long lapsed period after the initial exposure, is associated with pleural plaques and pleural effusion, pulmonary parenchymal fibrosis (asbestosis), pulmonary carcinoma, pleural and peritoneal mesothelioma, and other neoplasms. Indirect exposure may also entail an increased risk of lung disease or mesothelioma or both. Medicolegal investigation of suspected cases includes a lifetime occupational history, clinical history including smoking habits, radiological findings, clinical evidence of asbestosis, and may require detection of asbestos tissue burden.  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