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   21250篇
  免费   720篇
  国内免费   5篇
各国政治   1022篇
工人农民   873篇
世界政治   1616篇
外交国际关系   946篇
法律   12634篇
中国共产党   6篇
中国政治   197篇
政治理论   4456篇
综合类   225篇
  2021年   122篇
  2020年   295篇
  2019年   365篇
  2018年   509篇
  2017年   566篇
  2016年   621篇
  2015年   417篇
  2014年   443篇
  2013年   2299篇
  2012年   607篇
  2011年   633篇
  2010年   527篇
  2009年   553篇
  2008年   678篇
  2007年   747篇
  2006年   708篇
  2005年   642篇
  2004年   634篇
  2003年   632篇
  2002年   566篇
  2001年   762篇
  2000年   629篇
  1999年   576篇
  1998年   319篇
  1997年   246篇
  1996年   264篇
  1995年   225篇
  1994年   263篇
  1993年   261篇
  1992年   382篇
  1991年   411篇
  1990年   394篇
  1989年   327篇
  1988年   374篇
  1987年   306篇
  1986年   361篇
  1985年   314篇
  1984年   262篇
  1983年   247篇
  1982年   202篇
  1981年   218篇
  1980年   142篇
  1979年   186篇
  1978年   140篇
  1977年   120篇
  1976年   109篇
  1975年   135篇
  1974年   158篇
  1973年   111篇
  1972年   107篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
991.
Headspace gas chromatography was used to determine the concentration of ethanol and methanol in blood samples from 519 individuals suspected of drinking and driving in Sweden where the legal alcohol limit is 0.50 mg/g in whole blood (11 mmol/l). The concentration of ethanol in blood ranged from 0.01 to 3.52 mg/g with a mean of 1.83 +/- 0.82 mg/g (+/- S.D.). The frequency distribution was symmetrical about the mean but deviated from normality. A plot of the same data on normal probability paper indicated that it might be composed of two subpopulations (bimodal). The concentration of methanol in the same blood specimens ranged from 1 to 23 mg/l with a mean of 7.3 +/- 3.6 mg/l (+/- S.D.) and this distribution was markedly skew (+). The concentration of ethanol (x) and methanol (y) were positively correlated (r = 0.47, P less than 0.001) and implies that 22% (r2) of the variance in blood-methanol can be attributed to its linear regression on blood-ethanol. The regression equation was y = 3.6 + 2.1 x and the standard error estimate was 0.32 mg/l. This large scatter precludes making reliable estimates of blood-methanol concentration from measurements of blood-ethanol concentration and the regression equation. But higher blood-methanol concentrations are definitely associated with higher blood-ethanol in this sample of Swedish drinking drivers. Frequent exposure to methanol and its toxic products of metabolism, formaldehyde and formic acid, might constitute an additional health risk associated with heavy drinking in predisposed individuals. The determination of methanol in blood of drinking drivers in addition to ethanol could indicate long-standing ethanol intoxication and therefore potential problem drinkers or alcoholics.  相似文献   
992.
Research examining factors that predict youth’s involvement in organized activities is very limited, despite associations with positive outcomes. Using data from 1043 youth (49% female; 46.4% Hispanic, 35.4% African American, 14.0% Caucasian, and 4.2% other) from the Project on Human Development in Chicago Neighborhoods, this study examined how characteristics of parents (supervision, warmth) and neighborhoods (perceived neighborhood safety and collective efficacy) predict patterns of adolescents’ involvement in organized activities concurrently (i.e., intensity) and longitudinally (i.e., type and breadth). Parental supervision predicted adolescents’ participation in organized activities across multiple waves. Neighborhood violence was positively associated with concurrent participation in organized activities after controlling for socioeconomic status (SES), whereas higher neighborhood collective efficacy predicted greater breadth in organized activity participation across time. These findings have important implications regarding how to attract and sustain organized activity participation for low-income, urban youth.  相似文献   
993.
994.
A conception of transgender identity as an ‘authentic’ gendered core ‘trapped’ within a mismatched corporeality, and made tangible through corporeal transformations, has attained unprecedented legibility in contemporary Anglo-American media. Whilst pop-cultural articulations of this discourse have received some scholarly attention, the question of why this ‘wrong body’ paradigm has solidified as the normative explanation for gender transition within the popular media remains underexplored. This paper argues that this discourse has attained cultural pre-eminence through its convergence with a broader media and commercial zeitgeist, in which corporeal alteration and maintenance are perceived as means of accessing one’s ‘authentic’ self. I analyse the media representations of two transgender celebrities: Caitlyn Jenner and Nadia Almada, alongside the reality TV show TRANSform Me, exploring how these women’s gender transitions have been discursively aligned with a cultural imperative for all women, cisgender or trans, to display their authentic femininity through bodily work. This demonstrates how established tropes of authenticity-via-bodily transformation, have enabled transgender to become culturally legible through the wrong body trope. Problematically, I argue, this process has worked to demarcate ideals of ‘acceptable’ transgender subjectivity: self-sufficient, normatively feminine, and eager to embrace the possibilities for happiness and social integration provided by the commercial domain.  相似文献   
995.
996.
This study of the state frontline workforce breaks new ground by conducting an institutional analysis of rule abidance in the People's Republic of China (PRC). We draw upon a survey (n = 1,721) of Chengguan officers, the main players in regulatory enforcement of civil law in urban China, to explore the influence of autocratic one‐party rule on the meaning of and variation in rule abidance in China. The majority of Chengguan officers are rule followers, and demographic differences show little deviation from this norm. However, institutional factors associated with one‐party rule, particularly upward accountability, the privilege of administrative rank, and unequal access to power and resources, are significant in shaping differences in rule following among Chengguan officers. We conclude with a discussion of the similarities in institutional pressures on urban regulatory policing in China and the United States.  相似文献   
997.
Structural adjustment policies (SAPs) facilitate the hollowing out of the traditional roles performed by states. As a consequence, private entities (some perverse) offer services the state is incapable of or unwilling to provide. Beginning in the 1980s, SAPs plunged neighbourhoods in Latin America and the Caribbean into socioeconomic, and political disorder. This paper assesses the relationship between neoliberal reforms to the Jamaican state and the metamorphosis of violence since the mid-1980s. Neoliberalism transformed violence in Jamaica by increasing inter-gang conflicts, shootings and gang-related murders in Kingston’s garrisons. It also transformed political enforcers into community dons who use violence as a tool for business transactions in the international drug trade, and as a method of gaining local respect and authority.  相似文献   
998.
Research shows protective factors that mitigate risks for juvenile delinquency can also support the community reentry of incarcerated youths and deter future offending. Family engagement, educational attainment, and secure employment are widely accepted as important protective factors to prevent problematic behavior. Studies suggest these same protective factors are crucial for incarcerated youths and should be an integral part of reentry planning to improve post-release outcomes. Nevertheless, limited research exists on the association between these factors and the value of family involvement in reentry planning for incarcerated youths. This study addresses this gap by examining how increased family contact affects the likelihood of instituting education and employment reentry plans among youths in custody. Data were obtained from the Survey of Youth in Residential Placement (SYRP) that provides information on juvenile offenders in confinement. The SYRP is the first nationally representative cross-sectional survey to gather information directly from youths 10–20 years old in custody (N=7,073). Analyses were conducted using a sequence of regression models to test the relationship between the frequency of family contact and whether a youth had a plan for education or employment upon release. Results reflect that youths with increased family contact were one and a half times more likely to have both educational and employment reentry plans in place relative to youths with no family contact. Findings inform practice and policy to advocate for family involvement with youth in confinement, and further suggest that family plays a decisive role in preparing incarcerated youths for success upon release.  相似文献   
999.
Theories of candidate positioning suggest that candidates will respond dynamically to their electoral environment. Because of the difficulty of obtaining “bridge votes”, most existing approaches for estimating the ideal points of members of Congress generate static ideal points or ideal points that move linearly over time. We propose an approach for dynamic ideal point estimation using Project Vote Smart’s National Political Awareness Test to construct bridge votes. We use our dynamic estimates to measure aggregate change, to measure individual-level change, and to study the institutional and structural factors that explain the changing positions of House candidates and members of Congress. We demonstrate that while the Republican Party has been selecting increasingly extreme candidates, Democratic incumbents have become more extreme while in office. We also find that the congruence between elected members of Congress and their constituents is mostly explained by the selection as opposed to the responsiveness of the candidate. Nonetheless, we find evidence of dynamic responsiveness of incumbents in specific circumstances. We find that competitiveness, midterm elections, and sharing the president’s party affiliation are associated with greater responsiveness. Conversely, retirement is not associated with a change in responsiveness. We find no evidence of responsiveness of challengers. Finally, we find that close elections draw challengers who are more in line with the district’s ideology.  相似文献   
1000.
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