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   911篇
  免费   29篇
各国政治   38篇
工人农民   66篇
世界政治   123篇
外交国际关系   71篇
法律   401篇
中国政治   5篇
政治理论   228篇
综合类   8篇
  2022年   6篇
  2021年   5篇
  2020年   33篇
  2019年   22篇
  2018年   31篇
  2017年   28篇
  2016年   22篇
  2015年   35篇
  2014年   23篇
  2013年   138篇
  2012年   23篇
  2011年   25篇
  2010年   32篇
  2009年   31篇
  2008年   27篇
  2007年   22篇
  2006年   31篇
  2005年   38篇
  2004年   26篇
  2003年   27篇
  2002年   22篇
  2001年   24篇
  2000年   33篇
  1999年   16篇
  1998年   22篇
  1997年   16篇
  1996年   10篇
  1995年   17篇
  1994年   14篇
  1993年   12篇
  1992年   12篇
  1991年   10篇
  1990年   8篇
  1989年   13篇
  1988年   11篇
  1987年   9篇
  1986年   5篇
  1985年   8篇
  1984年   10篇
  1983年   7篇
  1982年   5篇
  1980年   2篇
  1979年   4篇
  1978年   3篇
  1977年   4篇
  1975年   4篇
  1974年   2篇
  1969年   2篇
  1968年   2篇
  1964年   2篇
排序方式: 共有940条查询结果,搜索用时 296 毫秒
81.
82.
This article investigates the hypothesis that 19th-century working class families in Leuven, Belgium, were controlling their fertility by means of birth spacing for household economic reasons. Detailed life-course data were collected in order to construct, on one hand, a set of covariates that represent the influences of natural fertility on birth intervals and, on the other, a number of family variables that represent the hypothetical, household economic motivation to space births. The findings strongly suggest that birth intervals were not merely a function of natural fertility differences and that family strategic spacing behavior also played a role.  相似文献   
83.
The White House Conference on Families both exemplified the contested nature of “family policy” since the late nineteenth century and inaugurated the latest phase in the venerable invocation of “family values” as a tactic for political mobilization. In 1976 presidential candidate Jimmy Carter proposed a White House Conference on the American Family in order to shore up support among cultural conservatives, especially Roman Catholics. Four years later, after much debate within the Carter administration as well as in the country at large about what constituted a legitimate family, three sessions of a White House Conference on Families were held. Cultural moderates, feminists, gays rights activists, devout Catholics, and evangelical Protestants disagreed vehemently about policies ranging from legalized abortion to family leave. Following a long though little known tradition, women were especially active among grassroots conservatives. Ultimately conservatives mobilized much more effectively than their liberal and moderate opponents, and they quickly made restoration of family values an effective wedge issue for the new Christian right and the Republican party. In many ways, the debate over family policy in the early 21st century still echoes that of the 1970s—or the 1930s or the 1910s.  相似文献   
84.
85.
Evaluating less than fully successful transformational leaders is difficult. One common method of assessing leadership is to focus on a single temporal narrative. A second approach uses a particular theory, such as transformational leadership, to frame the analysis. The latter, less common strategy is used with the example of Eric Shinseki, who served as both chief of staff of the U.S. Army and as secretary of the U.S. Department of Veterans Affairs (VA). The analytic framework used here has six major elements that are specified by 22 factors. Using those factors to evaluate Shinseki's tenure at the VA, he is found to be very poor in only 2 factors but poor in 11, adequate in 6, good in 1, and excellent in only 2. While using a list of factors does not eliminate subjectivity or the challenges of reaching a single assessment, it does clarify the elements of judgment and weighting.  相似文献   
86.
Legislators claim that how they explain their votes matters as much as or more than the roll calls themselves. However, few studies have systematically examined legislators’ explanations and citizen attitudes in response to these explanations. We theorize that legislators strategically tailor explanations to constituents in order to compensate for policy choices that are incongruent with constituent preferences, and to reinforce policy choices that are congruent. We conduct a within‐subjects field experiment using U.S. senators as subjects to test this hypothesis. We then conduct a between‐subjects survey experiment of ordinary people to see how they react to the explanatory strategies used by senators in the field experiment. We find that most senators tailor their explanations to their audiences, and that these tailored explanations are effective at currying support—especially among people who disagree with the legislators’ roll‐call positions.  相似文献   
87.
Disasters such as flash flooding, mass shootings, and train and airplane accidents involving large numbers of victims produce significant opportunity for research in the biosciences. This opportunity exists in the extreme tails of life events, however, during which decisions about life and death, valuing and foregoing, speed and patience, trust and distrust, are tested simultaneously and abundantly. The press and urgency of these scenarios may also challenge the ability of researchers to comprehensively deliver information about the purposes of a study, risks, benefits, and alternatives. Under these circumstances, we argue that acquiring consent for the immediate use of data that are not time sensitive represents a gap in the protection of human study participants. In response, we offer a two-tiered model of consent that allows for data collected in real-time to be held in escrow until the acute post-disaster window has closed. Such a model not only respects the fundamental tenet of consent in research, but also enables such research to take place in an ethically defensible manner.  相似文献   
88.
In forensics, bloodstains on dark fabrics might be invisible for the naked eye. Although several visualization, presumptive, and confirmatory blood tests have been developed, all have one or more disadvantages, especially on DNA analysis. We report here the use of a visualization assay that can visually detect blood drops up to 1/20 dilution. In this assay, the fabric is placed between two wet filter papers and covered by glass surfaces on both sides. Pressure is applied on the glass surfaces in which bloodstains transfer onto the filter papers through capillary forces. Detected stains can be tested with other more sensitive presumptive blood tests performed on the filter paper. Even more, DNA analysis can be performed on the transferred bloodstains. The presented visualization assay is easy to perform, extremely cheap, requires little hands on time, and does not affect bloodstain pattern analysis.  相似文献   
89.
90.
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