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   22797篇
  免费   682篇
各国政治   904篇
工人农民   870篇
世界政治   1811篇
外交国际关系   774篇
法律   14040篇
中国共产党   2篇
中国政治   118篇
政治理论   4753篇
综合类   207篇
  2020年   293篇
  2019年   340篇
  2018年   436篇
  2017年   521篇
  2016年   558篇
  2015年   385篇
  2014年   468篇
  2013年   2214篇
  2012年   551篇
  2011年   588篇
  2010年   476篇
  2009年   511篇
  2008年   591篇
  2007年   640篇
  2006年   620篇
  2005年   536篇
  2004年   541篇
  2003年   569篇
  2002年   514篇
  2001年   893篇
  2000年   836篇
  1999年   662篇
  1998年   352篇
  1997年   299篇
  1996年   268篇
  1995年   261篇
  1994年   309篇
  1993年   270篇
  1992年   436篇
  1991年   480篇
  1990年   430篇
  1989年   460篇
  1988年   420篇
  1987年   455篇
  1986年   429篇
  1985年   448篇
  1984年   381篇
  1983年   423篇
  1982年   319篇
  1981年   310篇
  1980年   235篇
  1979年   322篇
  1978年   233篇
  1977年   197篇
  1976年   174篇
  1975年   160篇
  1974年   185篇
  1973年   169篇
  1972年   146篇
  1971年   139篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
871.
Early alcohol use is associated with multiple negative outcomes later in life, including substance use disorders. Identification of factors related to this very early risk indicator can help inform early prevention efforts. This study prospectively examined the relationship between childhood adversities and early initiation of alcohol use (by age 14) among Puerto Rican youth, the Latino subgroup at highest risk for alcohol use disorders in adulthood. The data come from the Boricua Youth Study, a longitudinal study of Puerto Rican youth in two sites (South Bronx, New York, and the standard metropolitan area of San Juan, Puerto Rico). We focus on youth who were ages 10 and older at Wave 1 [M age at Wave 1 (SE)?=?11.64(0.05), N?=?1259, 48.85?% females]. Twelve childhood adversities were measured at Wave 1 and include 10 adverse childhood experiences commonly studied and two additional ones (exposure to violence and discrimination) that were deemed relevant for this study’s population. Early initiation of alcohol use was determined based on youth report at Waves 1 through 3 (each wave 1 year apart). Cox proportional hazards models showed that, when considered individually, adversities reflecting child maltreatment, parental maladjustment, and sociocultural stressors were related to early initiation of alcohol use. Significant gender interactions were identified for parental emotional problems and exposure to violence, with associations found among girls only. Adversities often co-occurred, and when they were considered jointly, physical and emotional abuse, parental antisocial personality, and exposure to violence had independent associations with early alcohol use, with a stronger influence of exposure to violence in girls compared to boys. The accumulation of adversities, regardless of the specific type of exposure, increased the risk for starting to drink at a young age in a linear way. The associations between childhood adversities and early alcohol use were generally consistent across sociocultural contexts, in spite of differences in the prevalence of exposure to adversity. Our findings highlight the importance of targeting multiple adversities and expanding the notion of adversity to capture the experiences of specific groups more adequately.  相似文献   
872.
Attachment, affect, and sex shape responsivity to psychosocial stress. Concurrent social contexts influence cortisol secretion, a stress hormone and biological marker of hypothalamic–pituitary–adrenal axis activity. Patterns of attachment, emotion status, and sex were hypothesized to relate to bifurcated, that is, accentuated and attenuated, cortisol reactivity. The theoretical framework for this study posits that multiple individual differences mediate a cortisol stress response. The effects of two psychosocial stress interventions, a modified Trier Social Stress Test for Teens and the Frustration Social Stressor for Adolescents were developed and investigated with early adolescents. Both of these protocols induced a significant stress reaction and evoked predicted bifurcation in cortisol responses; an increase or decrease from baseline to reactivity. In Study I, 120 predominantly middle-class, Euro-Canadian early adolescents with a mean age of 13.43 years were studied. The girls’ attenuated cortisol reactivity to the public performance stressor related significantly to their self-reported lower maternal-attachment and higher trait-anger. In Study II, a community sample of 146 predominantly Euro-Canadian middle-class youth, with an average age of 14.5 years participated. Their self-reports of higher trait-anger and trait-anxiety, and lower parental attachment by both sexes related differentially to accentuated and attenuated cortisol reactivity to the frustration stressor. Thus, attachment, affect, sex, and the stressor contextual factors were associated with the adrenal-cortical responses of these adolescents through complex interactions. Further studies of individual differences in physiological responses to stress are called for in order to clarify the identities of concurrent protective and risk factors in the psychosocial stress and physiological stress responses of early adolescents.  相似文献   
873.
874.
This article applies Saidiya Hartman’s framework of performing blackness to South African performance artist Athi-Patra Ruga’s performance series, The Future White Women of Azania, to consider the ways in which the performances index the convoluted imbrications of colonialism, specifically Apartheid policy in South Africa, and postcolonialism, specifically the anti-Apartheid struggle(s) and the current political and economic structure of South African democracy. It argues that Ruga’s performance makes evident political and economic systems that tout black and queer liberation while perpetuating black queer death. Ruga’s work also relocates Hartman’s framework to a transnational, postcolonial context, expanding the notion of performing blackness (and the entangled processes of domination and subordination that it maps) beyond the trans-Atlantic paradigm, suggesting that performing blackness could be used to understand the correlation between broader spatial and temporal phenomena that shape blackness. Finally, situating The Future White Women of Azania as not only a performance of blackness, but of queerness as well, postulates that layering sexuality onto Hartman’s model reveals that the dynamics articulated under performing blackness are evident between oppressors and oppressed and between members of each of these groups as Hartman notes, but also between the contingent axes of subjectivity within an individual’s experience.  相似文献   
875.
876.
In Weimar Germany, the Catholic Church vehemently warned ordinary parishioners about the dangers of extremist parties. We establish that constituencies' religious composition is a key empirical predictor of Nazi vote shares—dwarfing the explanatory power of any other demographic or socioeconomic variable. Even after carefully accounting for observational differences, Catholics were far less likely to vote for the NSDAP than their Protestant counterparts. The evidence suggests that this disparity was, in large part, due to the sway of the Catholic Church and its dignitaries. At the same time, we show that attempts to immunize Catholics against the radical left failed to achieve the desired result. To explain the puzzling asymmetry in the Church's influence at the ballot box, we develop a simple theoretical framework of elite influence in electoral politics.  相似文献   
877.
Inclusive growth is contested yet adopted by the World Bank to reduce poverty and inequality through rapid economic growth. Research has tested inclusive growth in sectors including agriculture, but few studies apply it to tourism which is significant for many developing countries. The paper interrogates tourism-led inclusive growth: supply chains, economic linkages/leakage, ownership, employment and expenditure. It draws from fieldwork in Vietnam where tourism has rapidly developed with partial economic benefits for local communities, but does not appear to fall within the inclusive growth paradigm. It is unclear if tourism-led growth will become any more inclusive in the short-to-medium term.  相似文献   
878.
Using public sector employment and corruption perception data for 72 countries across the world, this article demonstrates that despite common notion countries with “smaller” governments do not tend to have lower corruption. Under general assumptions, one can demonstrate that there is an optimal size of public sector employment corresponding to the highest capital intensity. The model has several implications: lower optimal sizes of governments for labor intensive countries and higher sizes for capital intensive ones, possibility to reduce corruption paying a cost of suboptimal output, and a higher “price” of an oversized government for labor intensive countries.  相似文献   
879.
880.
Abstract

This article explores the heterogeneous effects of the migration–remittance process on the educational attainment of Nepalese children. The results suggest that when controlling for remittances, the children of more educated or informed parents suffer from parental absence, while the children of less informed parents gain from migration, implying that the migration experience helps less educated parents estimate the value of and returns to education more precisely. The results also suggest that remittances help severely credit-constrained households enrol their children in school and prevent dropouts. These remittances help households that face less severe liquidity constraints increase their investment in quality education.  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