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   25626篇
  免费   755篇
各国政治   1049篇
工人农民   982篇
世界政治   2035篇
外交国际关系   849篇
法律   15490篇
中国共产党   2篇
中国政治   134篇
政治理论   5589篇
综合类   251篇
  2020年   292篇
  2019年   381篇
  2018年   480篇
  2017年   578篇
  2016年   596篇
  2015年   430篇
  2014年   492篇
  2013年   2497篇
  2012年   575篇
  2011年   650篇
  2010年   522篇
  2009年   603篇
  2008年   655篇
  2007年   683篇
  2006年   652篇
  2005年   590篇
  2004年   593篇
  2003年   617篇
  2002年   579篇
  2001年   996篇
  2000年   886篇
  1999年   727篇
  1998年   423篇
  1997年   347篇
  1996年   321篇
  1995年   318篇
  1994年   349篇
  1993年   324篇
  1992年   511篇
  1991年   558篇
  1990年   515篇
  1989年   534篇
  1988年   500篇
  1987年   508篇
  1986年   551篇
  1985年   532篇
  1984年   470篇
  1983年   491篇
  1982年   370篇
  1981年   332篇
  1980年   276篇
  1979年   365篇
  1978年   222篇
  1977年   230篇
  1976年   206篇
  1975年   180篇
  1974年   206篇
  1973年   191篇
  1972年   169篇
  1971年   154篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
This article argues that the effectiveness of the tactics ruling parties use to control the electoral arena may depend on the electoral experience of its subordinates. To substantiate this point, the work examines Russia’s “locomotives” – the practice of placing regional governors on the list of the ruling party, United Russia, during national legislative elections. It argues that electoral payoffs also came from select regions without locomotives. Given the move to appointed governors, list exclusion likely indicated gubernatorial vulnerability. As a result, governors left off United Russia’s list may have responded by seeking to demonstrate their electoral utility, and those with longer tenures were more likely to succeed in these efforts. An analysis of the 2007 Duma elections shows that United Russia’s vote share was higher in regions where long-serving governors were left off the list. Since Russia’s appointment system dramatically changed the gubernatorial corps between 2007 and 2011, the article also considers changes in the effects of list placement over time. It finds that the relationship between list exclusion and higher vote shares for United Russia disappears as governors with electoral experience were removed from office.  相似文献   
972.
973.
974.
Are internalizing and externalizing behavior problems interrelated via mutually reinforcing relationships (with each behavior leading to increases over time in levels of the other behavior) or mutually suppressing relationships (with each behavior leading to decreases over time in levels of the other behavior)? Past research on the directionality of these relationships has led to ambiguous results, particularly in adolescence. Furthermore, the extent to which prior results will generalize to adolescents with low levels of cognitive abilities remains unknown. This second limit is particularly important, given that these adolescents are known to present higher levels of externalizing and internalizing behaviors than their peers with average-to-high levels of cognitive abilities, and that the mechanisms involved in the reciprocal relationships between these two types of behaviors may differ across both populations. This study examines the directionality of the longitudinal relationships between externalizing and internalizing behavior problems as rated by teachers across three measurement waves (corresponding to Grades 8–10) in matched samples of 138 adolescents (34.78?% girls) with low levels of cognitive abilities and 556 adolescents (44.88?% girls) with average-to-high levels of cognitive abilities. The results showed that the measurement structure was fully equivalent across time periods and groups of adolescents, revealing high levels of developmental stability in both types of problems, and moderately high levels of cross-sectional associations. Levels of both internalizing and externalizing behaviors were higher among adolescents with low levels of cognitive abilities relative to those with average-to-high levels of cognitive abilities. Finally, the predictive analyses revealed negative reciprocal longitudinal relationships (i.e., mutually suppressing relationships) between externalizing and internalizing problems, a result that was replicated within samples of adolescents with low, and average-to-high levels of cognitive ability.  相似文献   
975.
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   
976.
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   
977.
978.
979.
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   
980.
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   
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