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   517篇
  免费   37篇
各国政治   31篇
工人农民   47篇
世界政治   35篇
外交国际关系   68篇
法律   221篇
中国政治   7篇
政治理论   142篇
综合类   3篇
  2023年   10篇
  2022年   2篇
  2021年   9篇
  2020年   18篇
  2019年   21篇
  2018年   33篇
  2017年   36篇
  2016年   36篇
  2015年   27篇
  2014年   24篇
  2013年   96篇
  2012年   21篇
  2011年   27篇
  2010年   11篇
  2009年   14篇
  2008年   14篇
  2007年   17篇
  2006年   12篇
  2005年   9篇
  2004年   19篇
  2003年   6篇
  2002年   5篇
  2001年   7篇
  2000年   8篇
  1999年   6篇
  1998年   6篇
  1997年   3篇
  1996年   7篇
  1995年   6篇
  1994年   2篇
  1993年   3篇
  1992年   4篇
  1991年   6篇
  1990年   3篇
  1989年   2篇
  1988年   3篇
  1987年   4篇
  1986年   2篇
  1985年   1篇
  1983年   3篇
  1982年   4篇
  1980年   1篇
  1978年   4篇
  1970年   1篇
  1967年   1篇
排序方式: 共有554条查询结果,搜索用时 15 毫秒
211.
Abstract: This report describes the identification of a merchant mariner who perished in 1948 when Northwest Airlines Flight 4422, a DC‐4 carrying 24 seamen and six crew members crashed into Mount Sanford, Alaska. Fifty‐one years later, a human forearm and hand were found close by the wreckage of the plane, prompting identification efforts using DNA and fingerprints. There were significant challenges to both the fingerprint and DNA analyses. The hand was badly desiccated, making fingerprint friction‐ridge detail almost invisible and the remains had been embalmed upon discovery, making DNA amplification difficult. We present the results of an interdisciplinary approach that successfully addressed these challenges and ultimately led to the identification of the remains. These efforts relied on efficient fingerprint rejuvenation and imaging techniques that improved print resolution, as well as new DNA extraction techniques optimized for aggressively embalmed remains.  相似文献   
212.
Two experiments examined the effects of multiple identification procedures on identification responses, confidence, and similarity relationships. When the interval between first and second identification procedures was long (Experiment 1), correct and false identifications increased, but the probative value of a suspect identification changed little; consistent witnesses were more confident than inconsistent witnesses; and the similarity relationships between suspect and foils were unchanged. When the interval between first and second identification procedures was short (Experiment 2), suspect identification rates changed little, but foil identifications increased significantly; confidence for all identifications increased; consistent witnesses were more confident than inconsistent witnesses; and similarity relationships changed such that witnesses were less likely to identify the suspect as being the best match to the perpetrator.  相似文献   
213.
A qualitative study was conducted to better understand the factors that contribute to psychotropic medication (PM) overuse among children in the child welfare system in Kentucky, including barriers to providing psychosocial interventions that potentially minimize the need for PM. Semi-structured interviews were conducted with personnel in the Department of Community-Based Services (DCBS). Participants identified important areas to target for system-wide quality improvement efforts, which included improved exchange of health information, training, and communications on the use of PM, and measures to improve access to non-pharmacological psychosocial interventions to address the mental healthcare needs of children in the child welfare system.  相似文献   
214.
215.
This paper sought the opinion of 200 Nigerians on their willingness to cooperate with the police during the Boko Haram crisis. Public perceptions of police effectiveness during the crisis, residence location, gender and religious affiliation were used as moderators. Data was analysed using an explanatory factor analysis and structural equation modelling. Results indicated a strong association between perceived effectiveness and willingness to report to the police with respondents who question the effectiveness of the police being less likely to be willing to report criminal activity about Boko Haram. Further to this, the impact of religion on willingness to report was at least partially mediated by perceived effectiveness of the police with the results showing that Christian respondents perceived the police as less effective. Females and those living in the north were significantly less willing to report criminal activity to the police. The findings are discussed in relation to the BH crises and directions for future research are given.  相似文献   
216.
While studies investigating the health effects of racial discrimination for children and youth have examined a range of effect modifiers, to date, relationships between experiences of racial discrimination, student attitudes, and health outcomes remain unexplored. This study uniquely demonstrates the moderating effects of vicarious racism and motivated fairness on the association between direct experiences of racism and mental health outcomes, specifically depressive symptoms and loneliness, among primary and secondary school students. Across seven schools, 263 students (54.4 % female), ranging from 8 to 17 years old (M = 11.2, SD = 2.2) reported attitudes about other racial/ethnic groups and experiences of racism. Students from minority ethnic groups (determined by country of birth) reported higher levels of loneliness and more racist experiences relative to the majority group students. Students from the majority racial/ethnic group reported higher levels of loneliness and depressive symptoms if they had more friends from different racial/ethnic groups, whereas the number of friends from different groups had no effect on minority students’ loneliness or depressive symptoms. Direct experiences of racism were robustly related to higher loneliness and depressive symptoms in multivariate regression models. However, the association with depressive symptoms was reduced to marginal significance when students reported low motivated fairness. Elaborating on the negative health effects of racism in primary and secondary school students provides an impetus for future research and the development of appropriate interventions.  相似文献   
217.
Moving from elementary to middle school is a time of great transition for many early adolescents. The present study examined students’ academic adjustment and relational self-worth at 6-month intervals for four time points spanning the transition from elementary school to middle school (N = 738 at time 1; 53 % girls; 54 % African American, 46 % European American). Grade point average (G.P.A.), intrinsic value for schoolwork, self-worth around teachers, and self-worth around friends were examined at every time point. The overall developmental trajectory indicated that G.P.A. and intrinsic value for schoolwork declined. The overall decline in G.P.A. was due to changes at the transition and across the first year in middle school. Intrinsic value declined across all time points. Self-worth around teachers was stable. The developmental trends were the same regardless of gender or ethnicity except for self-worth around friends, which was stable for European American students and increased for African American students due to an ascent at the transition into middle school. Implications for the education of early adolescents in middle schools are discussed.  相似文献   
218.
Although Ireland has had a long history of female emigration, the 1930s saw an important shift in emigration patterns. In the context of southern Irish nation-building, the emigration of tens of thousands of young Irish women to Britain raised serious questions about the opportunities and roles of women in the Irish Free State. This article analyses the Irish print media of the 1930s as discursive spaces within which female emigration was repeatedly highlighted and debated. Discussions of female emigration were usually related to issues of female education, female employment and the duties of women within the home. These issues need to be located within the specific context of Irish Free State economics and politics. The Conditions of Employment Act (1936) and the Constitution of 1937 were legislative measures that attempted to define and regulate the role of Irish women. But that is not to imply a simple ideological hegemony in the Free State; I argue that the media debates reveal the competing discourses surrounding women's roles in the newly established nation state. For example, one view was that young women and girls should be given training and preparation for emigration, another view was that plenty of jobs were available at home, while a third view was that women should be content to remain within the domestic sphere. The much-repeated view that women would be better off (at home) illustrates the overlapping constructions of home – domestic sphere – and home – the nation. The overlapping and interconnecting of these home spaces signified a blurring of boundaries that meant Irish women were expected to carry the responsibility for national as well as domestic well-being.  相似文献   
219.
Book reviews     
B.J.C. McKercher, Transition of Power: Britain's Loss of Global Pre-eminence to the United States, 1930-45, Cambridge University Press, Cambridge, 1999, xii + 403, £40, ISBN 0521 440 904

Joseph A. Maiolo, The Royal Navy and Nazi Germany, 1933-39: A Study in Appeasement and the Origins of the Second World War (London, MacMillan Press Ltd., 1998), xii + 259 pp. £?? ISBN 0-333-72007-5.

William I. Hitchcock, France Restored: Cold War Diplomacy and the Quest for Leadership in Europe, 1944-54, University of North Carolina Press, Chapel Hill, 1998, pp.291. £37.50 hardback, £14.50 paperback.

R. Holland, Britain and the Revolt in Cyprus 1954-1959 (Oxford, Oxford University Press, 1998). 347 pp. £48 hb. ISBN 0-19-820538-4.

Michael L. Krenn, Black Diplomacy: African Americans and the State Department 1945-1969 (London: M.E. Sharpe, 1999). Viii + 223pp. £15.95 pb. ISBN 0-7656-0381-0

Jerrold L. Schecter, Russian Negotiating Behavior (Washington, DC: United States Institute of Peace Press, 1998). 225 pp. ISBN: 1-878379-78-X.  相似文献   
220.
Contests over the scope and strength of regulation and governance are commonplace – and commonly repeated. The same players vie for the same government prize year after year: for example, environmental standards, government contracts, research grants, and public good provision. The open question is whether more rents are dissipated in repeated regulatory contests than onetime competitions. This question matters for regulation and governance because societies should design policies to waste the fewest scarce resources. According to some, the answer is “no”, but others say “yes”– more resources are wasted when people compete repeatedly for the same government prize. Herein, we use two game theoretic equilibrium concepts to help untangle the answer. Our results suggest non‐myopic contestants are more likely to behave as partners than rivals – provided the context is relatively sterile. Several common complications help break up the tacit partnership, including a disparity in relative ability, a shrinking prize, and additional players.  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