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   662篇
  免费   31篇
各国政治   45篇
工人农民   83篇
世界政治   60篇
外交国际关系   119篇
法律   270篇
中国政治   6篇
政治理论   106篇
综合类   4篇
  2023年   5篇
  2021年   3篇
  2020年   10篇
  2019年   12篇
  2018年   15篇
  2017年   17篇
  2016年   24篇
  2015年   11篇
  2014年   15篇
  2013年   99篇
  2012年   19篇
  2011年   25篇
  2010年   15篇
  2009年   27篇
  2008年   31篇
  2007年   46篇
  2006年   42篇
  2005年   27篇
  2004年   25篇
  2003年   19篇
  2002年   22篇
  2001年   9篇
  2000年   14篇
  1999年   10篇
  1998年   9篇
  1997年   10篇
  1996年   10篇
  1995年   7篇
  1994年   9篇
  1993年   11篇
  1992年   12篇
  1991年   7篇
  1990年   9篇
  1989年   2篇
  1988年   6篇
  1987年   5篇
  1986年   7篇
  1985年   6篇
  1984年   2篇
  1983年   2篇
  1982年   5篇
  1981年   11篇
  1980年   3篇
  1979年   4篇
  1978年   3篇
  1977年   2篇
  1973年   3篇
  1972年   2篇
  1967年   1篇
  1966年   1篇
排序方式: 共有693条查询结果,搜索用时 15 毫秒
71.
Images of private forces in Iraq—killed and mutilated in Fallujah, implicated in prisoner abuse at Abu Ghraib, and shooting up civilian vehicles—have provided a dramatic illustration of the role private security companies (pscs) now play in U.S. military operations. Though the United States’ use of contractors on the battlefield is not entirely new, the increased number of contractors deployed and the use of private security forces to perform an escalating number of tasks has created a new environment that poses important trade-offs for U.S. policy and military effectiveness and for U.S. relations with other states. This article outlines the history of U.S. contractors on the battlefield, compares that with the use of private security in Iraq, discusses the benefits and risks associated with their use, and proposes some trade-offs that decision-makers in the United States should consider while contemplating their use in the future.  相似文献   
72.
73.
Unlike previous studies on stress in local police officers, this study was unique in that it used Deputy U.S. Marshals as the population pool. This study replicated the study conducted by Storch and Panzarella (1996) who determined stress levels and stressors of police officers. A standardized inventory of stress was combined with a questionnaire about job stressors, individual job and career variables, and personal variables. One hundred Deputy U.S. Marshals from offices across the country responded to an anonymous survey. Generally, deputies scored low on the State-Trait Anxiety Inventory (Spielberger, Gorsuch, Lushene, Vagg, & Jacobs, 1983). The main stressors identified by the respondents were related to organizational variables, i.e., problems with management, bad bosses, and work environment. More stress was experienced by deputies who were inclined to think about job-related illnesses or being injured while on duty, those who were facing retirement, and those who disliked their current assignments.  相似文献   
74.
75.
76.
77.
78.
79.
80.
Newly available geographical information from the Panel Study of Income Dynamics (PSID) is used to estimate a variety of relationships involving high-poverty metropolitan census tracts. The longitudinal data from the PSID show a great deal of geographical mobility even for persistently poor adults, with as many as one fourth of certain groups of these entering and leaving poor urban census tracts in a year. At the same time, solution of the transition matrices for various groups—whites and blacks of various income classes, in families with and without children, living in different types of census tracts—in the early 1980s shows the gradual emptying out of poor urban tracts, particularly of whites and blacks in families without children. As a consequence, despite the great degree of geographical “churning,” poor urban areas gradually become poorer, blacker, and the home of a larger share of black families with children. Some of these aggregate trends had been noticed by researchers comparing these areas in the 1970 and 1980 censuses; our more up-to-date results demonstrate the relationships between the micro and macro data.  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