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   665篇
  免费   23篇
各国政治   27篇
工人农民   69篇
世界政治   37篇
外交国际关系   34篇
法律   389篇
中国政治   5篇
政治理论   124篇
综合类   3篇
  2023年   3篇
  2022年   3篇
  2021年   13篇
  2020年   11篇
  2019年   17篇
  2018年   23篇
  2017年   21篇
  2016年   24篇
  2015年   24篇
  2014年   20篇
  2013年   75篇
  2012年   20篇
  2011年   17篇
  2010年   23篇
  2009年   27篇
  2008年   23篇
  2007年   19篇
  2006年   14篇
  2005年   17篇
  2004年   22篇
  2003年   24篇
  2002年   13篇
  2001年   11篇
  2000年   22篇
  1999年   9篇
  1998年   11篇
  1997年   12篇
  1996年   6篇
  1995年   7篇
  1994年   4篇
  1993年   3篇
  1992年   3篇
  1991年   4篇
  1990年   5篇
  1989年   7篇
  1988年   4篇
  1987年   6篇
  1986年   5篇
  1985年   38篇
  1984年   28篇
  1983年   24篇
  1982年   4篇
  1981年   3篇
  1980年   6篇
  1977年   2篇
  1976年   2篇
  1974年   2篇
  1968年   1篇
  1966年   2篇
  1964年   1篇
排序方式: 共有688条查询结果,搜索用时 31 毫秒
401.
This study examined the mediating role of self-blaming attributions on peer victimization-maladjustment relations in middle school and the moderating role of classroom ethnic diversity. Latino and African American 6th grade participants (N = 1105, 56% female) were recruited from middle schools in which they were either members of the numerical majority ethnic group, the numerical minority, or one of several ethnic groups in ethnically diverse schools. Peer nomination data were gathered in the Fall of 6th grade to determine which students had reputations as victims of harassment and self-report data on self-blame for peer harassment and the adjustment outcomes of depressive symptoms and feelings of self-worth were gathered in the Spring of 6th grade, approximately 6 months later. A mediational model in which self-blame partly explained the relation between victimization and maladjustment was supported among students from the majority ethnic group in their classroom but not among students from the minority group. The usefulness of including ethnic diversity as an important context variable in studies of peer victimization during early adolescence was discussed.
Sandra GrahamEmail:

Amy D. Bellmore   is an Assistant Professor at University of Wisconsin, Madison in the Department of Educational Psychology. Her research interests include peer-directed aggression, ethnicity and ethnic contexts, and the development of interpersonal perception. Adrienne Nishina   is currently an Assistant Professor in the Department of Human and Community Development at University of California, Davis. Her major research interests include mental health in schools, adolescent peer relations, and ethnic diversity. Jaana Juvonen   is a Professor and Chair of the Developmental Psychology Program at University of California, Los Angeles. Her area of expertise is in young adolescent peer relationships and school adjustment.  相似文献   
402.
The current study modeled trajectories of substance use from ages 15 to 20 among 1,095 male serious juvenile offenders (M age = 16.54; 42% African-American, 34% Latino, 20% European-American, and 4% other ethnic/racial backgrounds) and prospectively predicted trajectories from risk and protective factors before and after controlling for time spent in a supervised setting. Results indicated that supervised time suppressed age-related growth in substance use. Trajectories of offenders with no supervised time and low levels of supervised time increased in substance use across age, whereas offenders with high levels of supervised time showed no growth. Almost all risk and protective factors had effects on initial substance use but only adolescent history of substance use, impulse control, and psychosocial maturity had an effect on change in substance use over time. Findings highlight the importance of formal sanctions and interventions superimposed on normal developmental processes in understanding trajectories of substance use among serious juvenile offenders.
Delfino Vargas-ChanesEmail:

Anne Marie Mauricio,   Ph.D., is a research faculty member at the Prevention Research Center at Arizona State University. She received her Ph.D. in Counseling Psychology from Michigan State University. Her major research interests include interpersonal violence and preventative interventions for substance use, academic disengagement, and mental health disorders. Michelle Little,   Ph.D., is an Assistant Professor at the University of Texas at San Antonio. She received her Ph.D. in Developmental Psychology from Temple University. Her major research interests include prevention of externalizing disorders. Laurie Chassin,   Ph.D., is a Regents Professor of Psychology at Arizona State University. She received her Ph.D. in Clinical Psychology from Teachers College, Columbia University. Her major research interests include the development and intergenerational transmission of alcohol, tobacco, and other drug use and substance use disorders. George P. Knight,   Ph.D., is a Professor in the Department of Psychology at Arizona State University. He received his Ph.D. in 1980 from the University of California at Riverside. His research interests include cultural adaptation in immigrant and minority youth and adults as well as methodological issues associated with research on ethnic minority families. Alex R. Piquero,   Ph.D., is presidential scholar and professor in the Department of Criminology & Criminal Justice at the University of Maryland College Park. He received his Ph.D. in Criminology from the University of Maryland College Park in 1996. His major research interests include criminal careers, criminological theory, and quantitative research methods. Sandra H. Losoya,   Ph.D., is a research assistant professor of psychology at Arizona State University. She received her Ph.D. in developmental psychology, specializing in socio-emotional development, from the University of Oregon. Her research interests include individual differences in emotional responding and coping, and sources of resilience in high-risk children. Delfino Vargas-Chanes,   Ph.D., is research faculty member in the Department of Psychology at Arizona State University. He received his Ph.D. in Sociology from Iowa State University. His major research interests include development of measurement instruments, structural equation modeling, multilevel modeling and advanced statistical analyses applied to social and behavioral sciences.  相似文献   
403.
This investigation examined the precursors of adolescents’ participation in sport and music activities in the United States by testing a developmental model across 7 years. Data were drawn from youth questionnaires in the Childhood and Beyond Study (92% European American; N = 594). Findings suggest that patterns of participation across a 3-year period in elementary school predict adolescents’ participation through their motivational beliefs. Specifically, children who participated in an activity, children who participated consistently across multiple years, and children who were highly active had higher adolescent motivational beliefs 4 years later than their peers. These motivational beliefs, in turn, positively predicted adolescents’ participation 1 year later. Cross-domain analyses suggest that children typically maintain their orientation toward sports and music (e.g., high music-low sport orientation, not oriented toward either domain) as they age. These findings highlight the consistency in children’s leisure pursuits and interests from childhood through adolescence.  相似文献   
404.
This article tracks continuities between early nineteenth-century female abolitionism and the role of white women reformers in Britain in the campaigns against segregation and lynch law in the USA, and on behalf of black rights in British colonies in the early twentieth century. It argues the value of a transnational perspective to these questions. More particularly, it explores the working out of the ‘maternalist’ legacy of female abolitionism, and the increasing problematising of ‘blackness’ and ‘Africanness’ in the perspectives of a circle of white women reformers in Britain.  相似文献   
405.
406.
Abstract

Foreign direct investment (FDI) can deliver benefits beyond the provision of capital, such as efficiency gains. We argue that the theorised positive effects of economic linkage are reduced when linkages are based on natural resources. Domestic elite coalitions supporting reform are also weaker in countries with extensive natural resources. Kazakhstan and Azerbaijan have high-value natural resources and significant FDI, making them most likely cases for reform. Kyrgyzstan is a contrasting case as it has few natural resources. We find that the institutional reforms we would anticipate because of linkages have not occurred and those that exist are often cosmetic.  相似文献   
407.
Eliza Oldham (c.1820–92) worked as a general maid in Rochdale and Halifax from the 1840s to the 1870s. A set of her letters to a wealthy relation of two of her employers, Helen Priestman Bright Clark (1840–1927), has been preserved, indicating their close friendship. This article asks what kind of friendship was possible in such a socially and economically unequal relationship, and what it might tell us about class identities and class contest. It locates the basis of this friendship in the emotional labour involved in domestic service, alongside the complex intersection of work, family and community life with larger arenas of radical and gender politics.  相似文献   
408.
Estimating postmortem interval (PMI) of surface found skeletal remains is challenging. This novel study used UV‐Vis‐NIR spectroscopy to scan soil collected from cadaver decomposition islands (CDIs) ranging from 15‐ to 963‐d postmortem and control soils. A decomposition product spectra model (DPS model) was constructed by deducting the control soil spectra from the CDI soil spectra for the estimation of postmortem indices: PMI (d), ADD4, ADD10, and ADD20. The DPS model (n = 55) was calibrated and subjected to a full cross‐validation. Calibration R2 and RPD for the DPS model ranged from 0.97 to 0.99 and from 6.1 to 9.9, respectively, for the four postmortem interval indices. Validation R2 and RPD for the DPS model ranged from 0.73 to 0.80 and from 1.9 to 2.2, respectively. The DPS model estimated postmortem intervals for three test CDIs in a clay soil under perennial grassland (test set 1; n = 3) and six CDIs in a sandy soil under a loblolly pine forest (test set 2; n = 6). Test set 1 had PMI prediction ranges from ?69 to ?117 days, ?796 to +832 ADD4, +552 to +2672 ADD10, and ?478 to ?20 ADD20 of observed PMI. Test set 2 PMI prediction ranged from ?198 to ?65 days, ?9923 to +2629 ADD4, ?6724 to +1321 ADD10, and ?2850 to +540 ADD20 of observed PMI. Test set 2 had poor predictions for two CDIs, for all measures of postmortem indices resulting in discussion of sampling depth, effect of body mass index (BMI), and scavenging.  相似文献   
409.
Pregnancies, including ones that follow sexual assaults, occasionally produce hydatidiform moles. The alleged fathers (AFs) of moles have been tested for paternity by identifying the mole's locus phenotype—the one or two visible paternal obligate alleles (POAs) per locus. The probability that the mole inherited the POAs from the AF was divided by the probability that the mole inherited the POAs from a random man. This likelihood ratio (LR) would increase if the mole's specific genotype was known. Moles are generated in five different ways that produce five distinct genotypes. Examining a mole's multilocus STR profile reveals a mole's pathogenesis, determines locus genotypes, and increases paternity LRs.  相似文献   
410.
The analysis of cannabis plant material submitted to seized‐drug laboratories was significantly affected by the signing of the Agricultural Improvement Act of 2018, which defined hemp and removed it from the definition of marijuana in the Controlled Substances Act. As a result, field law enforcement personnel and forensic laboratories now are in need of implementing new protocols that can distinguish between marijuana‐type and hemp‐type cannabis. Colorimetric tests provide a cost‐effective and efficient manner to presumptively identify materials prior to submission to a laboratory for analysis. This work presents the validation of the 4‐aminophenol (4‐AP) color test and demonstrates its utility for discriminating between marijuana‐type and hemp‐type cannabis (i.e., typification). Validation studies included the testing of numerous cannabinoid reference materials, household herbs, previously characterized cannabis plant samples, and real‐case samples. The 4‐AP test reliably produces a pink result when the level of Δ9‐tetrahydrocannabinol (THC) is approximately three times lower than the level of cannabidiol (CBD). A blue result is generated when the level of THC is approximately three times higher than that of CBD. Inconclusive results are observed when the levels of THC and CBD are within a factor of three from each other, demonstrating the limitations of the test under those scenarios.  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