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   1188篇
  免费   29篇
各国政治   81篇
工人农民   51篇
世界政治   77篇
外交国际关系   36篇
法律   827篇
中国政治   21篇
政治理论   117篇
综合类   7篇
  2023年   6篇
  2022年   5篇
  2021年   13篇
  2020年   27篇
  2019年   35篇
  2018年   41篇
  2017年   37篇
  2016年   46篇
  2015年   25篇
  2014年   22篇
  2013年   86篇
  2012年   35篇
  2011年   33篇
  2010年   25篇
  2009年   21篇
  2008年   31篇
  2007年   16篇
  2006年   15篇
  2005年   28篇
  2004年   43篇
  2003年   37篇
  2002年   25篇
  2001年   101篇
  2000年   67篇
  1999年   73篇
  1998年   35篇
  1997年   5篇
  1996年   3篇
  1995年   8篇
  1994年   4篇
  1993年   7篇
  1992年   21篇
  1991年   18篇
  1990年   39篇
  1989年   26篇
  1988年   29篇
  1987年   23篇
  1986年   14篇
  1985年   13篇
  1984年   8篇
  1983年   8篇
  1982年   11篇
  1981年   8篇
  1980年   4篇
  1979年   11篇
  1978年   7篇
  1973年   2篇
  1971年   4篇
  1970年   3篇
  1968年   2篇
排序方式: 共有1217条查询结果,搜索用时 15 毫秒
991.
Inverse Productivity or Inverse Efficiency? Evidence from Mexico   总被引:2,自引:0,他引:2  
Using a unique panel data set from rural Mexico, we find strong evidence of a negative relationship between farm size and both productivity and technical efficiency: large farms not only have a lower value of output per hectare than small farms, they also produce further from the efficiency frontier. Our findings suggest that, in spite of the ongoing transformation of agricultural supply chains and economists’ recommendations for small farmers to exit crop production, there may be sustained advantages for smallholder farms. Our analysis offers new insights into inverse-farm size relationship, the productivity–efficiency relationship, and the use of stochastic frontier techniques.  相似文献   
992.
In recent years, scholars have pointed to the politically demobilizing effects of means-tested assistance programs on recipients. In this study, we bridge the insights from policy feedback literature and adolescent political socialization research to examine how receiving means-tested programs shapes parent influence on adolescent political participation. We argue that there are differences in pathways to political participation through parent political socialization and youth internal efficacy beliefs for adolescents from households that do or do not receive means-tested assistance. Using data from a nationally representative sample of 536 Black, Latino, and White adolescents (50.8% female), we find that adolescents from means-tested assistance households report less parent political socialization and political participation. For all youth, parent political socialization predicts adolescent political participation. Internal political efficacy is a stronger predictor of political participation for youth from a non-means-tested assistance household than it is for youth from a household receiving means-tested assistance. These findings provide some evidence of differential paths to youth political participation via exposure to means-tested programs.  相似文献   
993.
Adolescent bullying is a common problem in schools across America. The consequences of bullying are significant, and can include severe psychological trauma and suicide. A better understanding of the mechanisms that link bullying and suicidal ideation is needed in order to develop effective prevention and intervention initiatives. Meaning in life is a potential mechanism that has not been studied in this context. It was hypothesized that meaning in life could serve as both a mediator and a moderator of the relationship between bullying victimization and suicidal ideation. As a mediator, meaning in life is considered to explain why bullying victimization leads to suicidal ideation. As a moderator, meaning in life is considered to buffer the ill effect of bullying victimization on suicidal ideation. Data collected from an ethnically diverse sample of 2,936 (50 % female), 6th–12th grade students from one urban school district in the Northeastern US were used to examine the hypotheses. The model for girls was consistent with mediation (i.e., meaning in life may explain how victimization leads to suicidal ideation). The model for boys was consistent with moderation (i.e., the ill effect of victimization on suicidal ideation was attenuated as meaning in life increased). Implications for prevention are discussed.  相似文献   
994.
Neuroleptic malignant syndrome (NMS) is a rare but potentially fatal disorder. In forensic cases, post-mortem diagnosis of NMS is sometimes difficult if ante-mortem information, such as neuroleptic ingestion or signs and symptoms, cannot be obtained. A 39-year-old Japanese male on a neuroleptic treatment regimen suddenly became agitated and died. Autopsy revealed muscle rigidity and hyperthermia. Post-mortem examination of blood revealed elevation of creatine phosphokinase-MM (CK-MM) and lactate dehydrogenase-4 and dehydrogenase-5 (LDH-4 and LDH-5). In renal glomeruli and tubules, myoglobin was stained immunohistochemically. From these findings, the cause of death was considered to be NMS. To support the diagnosis of NMS, both skeletal and cardiac muscles were stained with actin, myoglobin, desmin and mitochondria antibodies immunohistochemically. Actin, myoglobin, desmin, and mitochondria had been lost from skeletal, but not from the cardiac muscle, which suggested that only the skeletal muscle was damaged. Moreover, because mitochondria had disappeared only from the skeletal muscle, it was considered that skeletal muscle degeneration was caused by mitochondrial damage. Therefore, it is suggested that immunostaining of skeletal muscle by antibodies for muscle-associated proteins and mitochondria is useful to corroborate a diagnosis of NMS.  相似文献   
995.
电击死心房肌中心钠素改变的免疫组化研究   总被引:3,自引:0,他引:3  
Liu X  Song Y  Bi Q  Luo B  Hou J 《法医学杂志》1998,14(3):144-145
应用免疫组织化学LSAB法及计算机图像分析技术,观察电击死者心房肌中心钠素(ANP)变化情况,结果发现,电击死组右心房肌中ANP颗粒明显减少,此变化有助于电击死的诊断,并为临床电击伤的治疗提供参考。  相似文献   
996.
997.
India, Brazil and South Africa constitute an important subset of Brazil, Russia, India, China and South Africa (BRICS) and emerging powers at large in a shifting global order. The article examines the capacity of these democratic BRICS to serve as a role model to the rest of the developing world, at a time when liberal democracy seems to be experiencing serious challenges and dislocations in the Global North. The article considers the important achievements of democratic BRICS, in terms of their individual performances as well as through active cooperation strategies through organisations such as the India, Brazil and South Africa (IBSA) Dialogue Forum. Attention is drawn to the inherent structural dilemmas confronted by democratic BRICS to serve as genuine role models, given their domestic weaknesses as well as inherent constraints on their collective action strategies. Our central argument is that these countries, individually and collectively, are likely to have a crucial bearing on the future of liberal democracy on a global scale.  相似文献   
998.
This work examines differences in the level of violence of counterterrorism measures adopted by Central Asian states. Why do some Central Asian governments opt for wanton repression in the name of the struggle with terrorism, while others adopt less severe methods of control and prevention? To answer this question, this study draws on a synthesis of rationalist and constructivist explanations. Like rationalists, it posits that the magnitude of terrorism and states' material capabilities affect governments' responses to terrorism. Following constructivists, the study stresses the impact of ideas about the nature of terrorist threats and views on the appropriateness of the use of force on the counterterrorism policies of Central Asian states.  相似文献   
999.
1000.
Police officers in Western countries do not run day‐to‐day security operations in private companies and corporations. In contrast, Chinese police are directly involved in corporate security management. Responding to the criticisms that comparative studies in the West have overemphasized general and macro‐sociological analyses, this paper will introduce a specific Chinese corporate policing model based on the researcher's two‐month field research recently. The corporation under study is managed through a score keeping system, where security scores are concretely established, and a comprehensive approach is utilized which embodies the use of technical, formal, administrative, educational, and community control measures.  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