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   5499篇
  免费   635篇
各国政治   524篇
工人农民   172篇
世界政治   465篇
外交国际关系   214篇
法律   3385篇
中国政治   70篇
政治理论   1257篇
综合类   47篇
  2021年   63篇
  2020年   92篇
  2019年   214篇
  2018年   170篇
  2017年   233篇
  2016年   233篇
  2015年   200篇
  2014年   201篇
  2013年   828篇
  2012年   185篇
  2011年   209篇
  2010年   189篇
  2009年   132篇
  2008年   184篇
  2007年   124篇
  2006年   144篇
  2005年   110篇
  2004年   128篇
  2003年   110篇
  2002年   109篇
  2001年   192篇
  2000年   149篇
  1999年   116篇
  1998年   48篇
  1997年   61篇
  1996年   48篇
  1995年   61篇
  1994年   56篇
  1993年   68篇
  1992年   88篇
  1991年   91篇
  1990年   85篇
  1989年   67篇
  1988年   92篇
  1987年   84篇
  1986年   104篇
  1985年   112篇
  1984年   94篇
  1983年   86篇
  1982年   40篇
  1981年   42篇
  1979年   38篇
  1978年   37篇
  1977年   28篇
  1975年   31篇
  1974年   47篇
  1972年   27篇
  1971年   31篇
  1970年   30篇
  1968年   32篇
排序方式: 共有6134条查询结果,搜索用时 15 毫秒
991.
992.
Ample research exists on the relationship between mainstream constructions of racialized images and perceptions of criminals. Fewer studies, however, have assessed the influence of political rhetoric in the construction and the mobilization of images of criminals as the “racial other.” This study employs a qualitative content analysis guided by an intersectionality framework to answer the questions: to what extent Presidential rhetoric influenced images of criminals; and how was colorblind language used to facilitate this process? The examination of Presidential speeches related to crime policies, given from 1969 to 1996, revealed that criminal activity was primarily articulated as being committed by “young Black impoverished males.” Through the use of colorblind strategies, race, while not explicitly referenced, was the most salient dimension of the imagery of criminals depicted in Presidential rhetoric.  相似文献   
993.
We examined potential predictors of initial court agreement and 1‐year relitigation in a sample of contested paternity cases involving unmarried parents coming to court to establish paternity, child support, and other issues. Cases participated in an RCT of a parent program and of a waiting period between establishment of paternity and court hearing. We controlled for RCT study factors and used baseline assessment data to predict likelihood of reaching full agreement in the initial court hearing and relitigation in the following year. Findings suggest that cases in which parents get along better outside of court are more likely to reach agreement and less likely to return to court. Additionally, particular parent demographics predict lower likelihood of reaching initial agreement (e.g., parents are non‐White, father earns below $10,000 yearly), more relitigation (e.g., parents are non‐White, mother earns above $10,000 yearly, father has children with others), and less relitigation (e.g., father earns above $10,000 yearly). Child demographics and most parent relationship characteristics did not predict outcomes. We discuss findings and offer suggestions for court interventions.  相似文献   
994.
Early sexual behaviors during adolescence have the potential to lead to unhealthy outcomes. This study explored the association between specific dimensions of maternal relationship quality and adolescent sexual debut by age 15. We hypothesized that adolescents who have poor maternal relationships are at greater risk of early sexual debut than those who have a more supportive relationship. These hypotheses were examined using both adolescents’ perception of their maternal relationship quality and observed relationship quality. A sample of 268 adolescents (142 girls; 90% European American) were followed longitudinally from age 13 to age 15. The results indicate that adolescents with sexual debut by age 15 report significantly worse relationships with their mothers compared with other adolescents. Furthermore, behavioral observations of lower maternal support and higher observed displays of externalizing affect towards the mother also were related to early sexual debut. The significance of maternal relationship quality remained after controlling for family structure, race, and socioeconomic status. These findings suggest that mothers have a significant role in the timing of their adolescents’ sexual debut.  相似文献   
995.
One of the most fundamental factors related to psychological well being across the lifespan is whether a person perceives social support from important others in his or her life. The current study explored changes in and relationships among perceived social support (SS) and socioemotional adjustment (SEA) across the 1-year transition from elementary to junior high school. Two cohorts of students (N = 140) participated in the current study that took place across a 3-year time span. Analyses of the transition data for boys and girls together reveal declines in perceived total support and teacher support as well as an increase in self-reported school problems. When considering the sexes separately, girls?? perceived total support, close friend support and school support declined while boy??s self-reported school problems increased across the transition. Although social support did not emerge as a mediator or predictor for any of the socioemotional variables in the current study, results reveal that, in general, perceived social support and socioemotional functioning at the end of the last year of elementary school predicts perceived social support and socioemotional functioning at the end of the first year of junior high school. Study limitations and implications for research and practice are discussed.  相似文献   
996.
Since the mid‐1990s during the Santer, Prodi, and Barroso presidencies, the European Commission has experienced several public management policy cycles. Included on the Barroso Commission's (2004–2008) policy agenda was the reform of internal financial control, prompted by significant irregularities in budget execution signalled repeatedly by the European Court of Auditors (ECA) in its annual Declaration of Assurance (DAS) and Annual Reports. This led to a declared Barroso Commission strategic objective of achieving a ‘positive DAS' by 2009. The proposed solution was ‘integrated internal control’ based on an international reference point within the accounting and auditing professions. The result was a centrally co‐ordinated Commission project aiming to reform management and audit practices within both the Commission and EU member states. This article reports on the ‘positive DAS' and ‘integrated internal control’ policy cycle and explains its agenda‐setting, alternative‐specification, and decisional processes.  相似文献   
997.
Portugal has been characterized by a late discontinuous democratization process. This contribution discusses the case of state and public administration reform in Portugal by using approaches from democratization, modernization and Europeanization theories. In order to understand the Portuguese case, the concept of ‘neo‐patrimonialism’ is used. We characterize Portuguese public administration as still having ‘neo‐patrimonial’ features, and therefore is still in transition from old closed‐minded practices such as particularistic decision making or clientelistic relationships to new open‐minded ones. The ‘new’ governance agenda combines new public management instruments and a growing flexibilization of public administration towards networks with non‐statal actors and has certainly led to some improvement in the quality of the services associated with public administration. Although is still too early to assess, top‐down and horizontal Europeanization processes, particularly since the late 1990s, may have contributed to a more reflexive approach in moving towards a more endogenous strategic vision based on the needs of the Portuguese state and public administration.  相似文献   
998.
Gang‐involved youth are disproportionately involved in criminal behavior, especially violence. The processes accounting for this enhanced illegal activity, however, remain speculative. Employing a life‐course perspective, we propose that gang membership can be conceptualized as a turning point in the lives of youth and is thus associated with changes in emotions, attitudes, and routine activities, which, in turn, increase illegal activity. Using prospective data from a multisite sample of more than 1,400 youth, the findings suggest that the onset of gang membership is associated with a substantial change in emotions, attitudes, and social controls conducive to delinquency and partially mediate the impact of gang membership on delinquent activity. Desistance from gangs, however, was not associated with similar systematic changes in these constructs, including delinquent involvement.  相似文献   
999.
Primary cardiac tumors are rare, with an autopsy incidence of 0.03%. Seventy-nine percent to 85% of primary cardiac tumors are benign, and of the benign tumors, cardiac hemangiomas account for 5-10% of cases. Most cardiac hemangiomas are asymptomatic and are discovered incidentally at autopsy, or by echocardiography, computerized tomography, or magnetic resonance imaging. We report a case of sudden death owing to cardiac hemangioma in a 22-year-old woman who collapsed while shopping and became unresponsive. The autopsy revealed a hemorrhagic mass on the surface of the right atrium which was infiltrating and replacing the wall of the right atrium; histopathological examination confirmed the tumor was a cavernous hemangioma. Fewer than 20 cases of right atrial cavernous hemangiomas have been reported in English literature, emphasizing the rarity of our case.  相似文献   
1000.
Through a comparison of fingermark sweat corrosion of α phase brass in both the U.K. and Iraq, we show how samples from Iraq have improved fingermark corrosion over U.K. samples that require no additional enhancement prior to visualization. Over 50% of Iraqi samples produced fingermark corrosion with full ridge detail compared with 0% from the U.K. X-ray photoelectron spectroscopy analysis of the fingermark corrosion products showed that Iraqi samples exhibit more dezincification with the Zn:Cu ratio averaging 1:1.82 compared with 1:3.07 for U.K. samples. Auger spectroscopy showed the presence of both zinc oxide and copper (I) oxide. No copper (II) was observed on the surface of the corroded brass. Opportunities to exploit the optical properties of these thin film oxides to enhance the visualization of fingermark corrosion are considered, and the potential to use fingermark corrosion of metal as a means of visualizing fingerprints in war zones is discussed.  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