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   612篇
  免费   26篇
各国政治   19篇
工人农民   117篇
世界政治   41篇
外交国际关系   36篇
法律   288篇
中国政治   4篇
政治理论   132篇
综合类   1篇
  2023年   2篇
  2022年   3篇
  2020年   8篇
  2019年   17篇
  2018年   19篇
  2017年   32篇
  2016年   27篇
  2015年   22篇
  2014年   18篇
  2013年   105篇
  2012年   15篇
  2011年   23篇
  2010年   16篇
  2009年   13篇
  2008年   30篇
  2007年   19篇
  2006年   18篇
  2005年   21篇
  2004年   21篇
  2003年   14篇
  2002年   11篇
  2001年   7篇
  2000年   10篇
  1999年   14篇
  1998年   7篇
  1997年   11篇
  1996年   4篇
  1995年   15篇
  1994年   11篇
  1993年   8篇
  1992年   8篇
  1990年   4篇
  1988年   10篇
  1987年   3篇
  1986年   6篇
  1985年   7篇
  1984年   4篇
  1983年   6篇
  1982年   11篇
  1981年   6篇
  1979年   5篇
  1978年   7篇
  1977年   4篇
  1976年   5篇
  1975年   3篇
  1974年   1篇
  1973年   2篇
  1972年   1篇
  1970年   1篇
  1968年   1篇
排序方式: 共有638条查询结果,搜索用时 15 毫秒
21.
The United States Supreme Court’s recent decision relating to violent video games revealed divisions within the scientific community about the potential for negative effects of such games as well as the need for more, higher quality research. Scholars also have debated the potential for violent games to have positive effects such as on visuospatial cognition or math ability. The current study sought to extend previous literature by using well-validated clinical outcome measures for relevant constructs, which have generally been lacking in past research. Cross-section data on aggression, visuospatial cognition, and math achievement were available for a sample of 333 (51.7 % female) mostly Hispanic youth (mean age = 12.76). Prospective 1-year data on aggression and school GPA were available for 143 (46.2 % female) of those youth. Results from both sets of analysis revealed that exposure to violent game had neither short-term nor long-term predictive influences on either positive or negative outcomes. A developmental analysis of the cross-sectional data revealed that results did not differ across age categories of older children, preadolescents or adolescents. Analysis of effect sizes largely ruled out Type II error as a possible explanation for null results. Suggestions for new directions in the field of video game research are proffered.  相似文献   
22.
23.
The Evangelical reformer Hannah More hoped to change the educational practices of the British upper classes. In Strictures on the Modern System of Female Education (1799), Hints Toward Forming the Character of a Princess (1805), and Coelebs in Search of a Wife (1808), More lays out a program devised primarily for girls, but to some extent also applicable to the education of boys. All these works assert that education should focus relentlessly upon the inculcation of Christian principles and such a proposal was implicitly critical of current practices. In order to promote her program effectively, More had to suggest that it was not incompatible with the most influential eighteenth-century pedagogical theories. This rhetorical strategy was a success in practical terms, but prevented her from achieving coherence as an educational theorist  相似文献   
24.
25.
We describe trends in maternal employment and leave‐taking after birth of a newborn and analyze the extent to which these behaviors are influenced by parental leave policies. Data are from the June Current Population Survey (CPS) Fertility Supplements, merged with other months of the CPS, and cover the period 1987 to 1994. This time span is one during which parental leave legislation expanded at both the state and federal level. We also provide the first comprehensive examination of employment and leave‐taking by fathers of infants. Our main finding is that leave expansions are associated with increased leave‐taking by both mothers and fathers. The magnitudes of the changes are small in absolute terms but large relative to the baseline for men and much greater for college‐educated or married mothers than for their less‐educated or single counterparts. © 2009 by the Association for Public Policy Analysis and Management  相似文献   
26.
Milton J  Ferguson B  Mills T 《危机》1999,20(4):171-177
General practitioners (GPs) are assumed to occupy an important position in the prevention of suicide through the introduction of risk assessment techniques commonly used in psychiatric practice. Despite this theoretical role for primary care services, it remains unclear how frequently GPs implement risk assessment in patients who may be vulnerable to suicide. To address this, a retrospective survey of probable suicides was conducted within a primary care setting utilizing a questionnaire of GPs who had experienced a patient suicide and was augmented by hospital and coroners' records. 85% of questionnaires were returned and 61 deaths were adjudged as suicides during the year long census period. 75% of suicides were male and 54% were aged under 35.28% were in contact with psychiatric services prior to death, although 60% had some diagnosis of mental disorder. GPs had little knowledge of a patient's life circumstances in up to half of cases. Recording of risk assessment occurred in 38% of subjects, was positively associated with prior psychiatric contact (p = 0.001) but negatively associated with presence of physical illness (p = 0.004), older patient age (p = 0.04), and GPs length in practice (p = 0.05). One GP felt their suicide case was preventable. The low rate of risk assessment and limited knowledge of patient lifestyle point to the need for active engagement of GPs in future suicide prevention strategies and should influence the content of training programs in primary care.  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