全文获取类型
收费全文 | 11320篇 |
免费 | 318篇 |
专业分类
各国政治 | 603篇 |
工人农民 | 296篇 |
世界政治 | 883篇 |
外交国际关系 | 501篇 |
法律 | 6352篇 |
中国共产党 | 1篇 |
中国政治 | 37篇 |
政治理论 | 2834篇 |
综合类 | 131篇 |
出版年
2020年 | 110篇 |
2019年 | 135篇 |
2018年 | 217篇 |
2017年 | 239篇 |
2016年 | 288篇 |
2015年 | 194篇 |
2014年 | 205篇 |
2013年 | 1382篇 |
2012年 | 310篇 |
2011年 | 291篇 |
2010年 | 259篇 |
2009年 | 285篇 |
2008年 | 307篇 |
2007年 | 299篇 |
2006年 | 308篇 |
2005年 | 262篇 |
2004年 | 262篇 |
2003年 | 265篇 |
2002年 | 272篇 |
2001年 | 375篇 |
2000年 | 362篇 |
1999年 | 291篇 |
1998年 | 178篇 |
1997年 | 176篇 |
1996年 | 118篇 |
1995年 | 149篇 |
1994年 | 154篇 |
1993年 | 142篇 |
1992年 | 221篇 |
1991年 | 228篇 |
1990年 | 205篇 |
1989年 | 235篇 |
1988年 | 209篇 |
1987年 | 212篇 |
1986年 | 226篇 |
1985年 | 200篇 |
1984年 | 183篇 |
1983年 | 177篇 |
1982年 | 128篇 |
1981年 | 127篇 |
1980年 | 94篇 |
1979年 | 153篇 |
1978年 | 101篇 |
1977年 | 94篇 |
1976年 | 82篇 |
1975年 | 88篇 |
1974年 | 103篇 |
1973年 | 99篇 |
1972年 | 83篇 |
1971年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
241.
This paper traces a new development in regulation that encourages utilities to engage more directly with their customers. We make four contributions: First, we perform a comprehensive analysis of how regulators are using customer engagement, and offer a simple model for understanding different customer engagement initiatives. Second, we review assessments of customer engagement. We find that there are no quantitative, empirically robust assessments of the effectiveness of customer engagement as a regulatory tool. Third, we develop two detailed case studies of an energy regulator and a water regulator that are in the forefront of customer engagement efforts. We find that there is no direct link between the engagement strategy used and the economic incentives received by a firm. Finally, we propose a framework for improving the customer engagement process. The new framework relies on microeconomics, modern tools of program evaluation, and supplying the regulated firm with direct incentives to engage with the customer. 相似文献
242.
Social Justice Research - A cross-national study with university students from Germany (n?=?1135) and Turkey (n?=?634) tested whether personal belief in a just world (PBJW)... 相似文献
243.
244.
245.
246.
Breana N. Peace M.S. James T. Pokines Ph.D. Peter M. Cummings M.Sc. M.D. Allen G. Harbaugh Ph.D. 《Journal of forensic sciences》2020,65(5):1416-1423
Hacking trauma is prevalent in forensic cases involving genocide and dismemberment, but research into the identification of this type of trauma is lacking. The present study examines characteristics of hacking and blunt force skeletal trauma in order to determine if there is a point at which blunt force trauma becomes distinguishable from hacking trauma. Ten implements with a range of blade angles (i.e., the striking surface of the implement) were used in conjunction with a controlled-force hacking device to impact 100 limb bones of white-tailed deer (Odocoileus virginianus). Observations of the trauma included the occurrence and degree of fragmentation, the entrance widths of the impacts, and composite scores of six hacking characteristics, especially the distinctive V-shaped kerf. ANOVA tests and regression analyses were used to assess the relationships between these characteristics and the blade angles. A significant relationship (p-value = 0.011) was found between the composite hacking scores and the blade angles, indicating that blunt force and hacking trauma can be distinguished. The entrance widths of the impacts exhibited a significant relationship with the blade angles (p-value = 0.037). There was also a significant relationship between the visibility of a V-shaped kerf in the bones (p-value = 0.003), with visibility decreasing around the 60° blade angle. These data should assist in establishing guidelines to differentiate hacking and blunt force skeletal trauma in cases where the implement is on a spectrum between sharp and blunt. 相似文献
247.
Robert A. Lonardo Peggy C. Giordano Monica A. Longmore Wendy D. Manning 《Journal of youth and adolescence》2009,38(3):367-383
Adolescent networks include parents, friends, and romantic partners, but research on the social learning mechanisms related
to delinquency has not typically examined the characteristics of all three domains simultaneously. Analyses draw on data from
the Toledo Adolescent Relationships Study (n = 957), and our analytic sample contains 51% male and 49% female as well as 69% white, 24% African-American, and 7% Latino
respondents. Parents,’ peers,’ and partners’ deviance are each related to respondents’ delinquency, and affiliation with a
greater number of deviant networks is associated with higher self-reported involvement. Analyses that consider enmeshment
type indicate that those with both above average romantic partner and friend delinquency report especially high levels of
self-reported involvement. In all comparisons, adolescents with deviant romantic partners are more delinquent than those youths
with more prosocial partners, regardless of friends’ and parents’ behavior. Findings highlight the importance of capturing
the adolescent’s entire network of affiliations, rather than viewing these in isolation, and suggest the need for additional
research on romantic partner influences on delinquent behavior and other adolescent outcomes.
相似文献
Robert A. LonardoEmail: |
248.
Alexandra Loukas Ken G. Ripperger-Suhler Karissa D. Horton 《Journal of youth and adolescence》2009,38(6):804-812
This study examined (a) the associations between school connectedness and early adolescent adjustment problems over a 1 year
period and (b) the equivalence of these associations across gender. Five hundred middle school students (53.4% female), initially
in the 6th and 7th grades, participated in the two-wave study. Results from two-group cross-lagged panel analyses were consistent
across boys’ and girls’ data. After controlling for baseline levels of adjustment problems, school connectedness predicted
lower levels of early adolescent conduct problems 1 year later. Regarding the opposite direction of associations, and even
after baseline levels of school connectedness were taken into account, conduct problems predicted lower levels of subsequent
school connectedness. There were no cross-lagged associations between depressive symptoms and school connectedness, although
elevated levels of baseline depressive symptoms predicted higher levels of subsequent conduct problems. Findings elaborate
previous research by demonstrating that early adolescents actively shape the middle school environment.
相似文献
Karissa D. HortonEmail: |
249.
This article examines the well-documented relationship between early initiation or onset of criminal behavior and a heightened
risk of involvement in offending. Previous research examining this question conducted by Nagin and Farrington (Criminology
30:235–260, 1992a; Criminology 30:501–523, 1992b) used data from the Cambridge Study in Delinquent Development and found that: (1) onset age was correlated with offending
involvement; and (2) the correlation could be explained by stable individual differences in the propensity to offend rather
than a causal effect of early onset age. In this study, similar analytic methods are applied to data from the Second Philadelphia
Birth Cohort. This data set consists of all 13,160 males born in Philadelphia in 1958 who resided in the city continuously
from ages 10 to 18, slightly more than half of whom were non-white. Information from each of the youths was collected from
schools, juvenile justice agencies, other official sources and surveys. In a model that mimics previous analyses, we initially
found that an early age of onset is associated with greater subsequent involvement in delinquent behavior. When unobserved
criminal propensity was controlled, however, we found that a late rather than an early onset of delinquency was related to
future offending. In finding a state dependent effect for age of onset, our findings are contrary to propensity theory in
criminology. In finding that it is late rather early onset which puts youth at risk for future offending, our findings are
contrary to developmental/life course theory. Our results are more compatible with traditional criminological theory that
is friendly to state dependence processes, though they too have not to date articulated why a late onsetting of offending
might be particularly criminogenic.
Sarah Bacon is an Assistant Professor in the College of Criminology and Criminal Justice at the Florida State University, Tallahassee, Florida. She received her Ph.D. from the University of Maryland. Her research interests focus on quantitative methods, testing criminological theory, and capital punishment. This paper is an extension of work conducted for her M.A. thesis at the University of Maryland. Raymond Paternoster is Professor in the Department of Criminology and Criminal Justice at the University of Maryland and Faculty Affiliate of the Maryland Population Research Center, College Park, Maryland. He received his Ph.D. from Florida State University. His research interests focus on testing criminological theory, the relationship between events in adolescence and delinquency, and capital punishment. Robert Brame is Professor in the Department of Criminal Justice at the University of North Carolina Charlotte, Charlotte, North Carolina. He received his Ph.D. from the University of Maryland. His current research interests focus on domestic violence, the use of criminal records for screening purposes, linkages between adolescent employment and criminal behavior, and capital punishment. 相似文献
Raymond PaternosterEmail: |
Sarah Bacon is an Assistant Professor in the College of Criminology and Criminal Justice at the Florida State University, Tallahassee, Florida. She received her Ph.D. from the University of Maryland. Her research interests focus on quantitative methods, testing criminological theory, and capital punishment. This paper is an extension of work conducted for her M.A. thesis at the University of Maryland. Raymond Paternoster is Professor in the Department of Criminology and Criminal Justice at the University of Maryland and Faculty Affiliate of the Maryland Population Research Center, College Park, Maryland. He received his Ph.D. from Florida State University. His research interests focus on testing criminological theory, the relationship between events in adolescence and delinquency, and capital punishment. Robert Brame is Professor in the Department of Criminal Justice at the University of North Carolina Charlotte, Charlotte, North Carolina. He received his Ph.D. from the University of Maryland. His current research interests focus on domestic violence, the use of criminal records for screening purposes, linkages between adolescent employment and criminal behavior, and capital punishment. 相似文献
250.
Growth curve analyses were used to investigate parents’ and peers’ influence on adolescents’ choice to abstain from antisocial
behavior in a community-based sample of 416 early adolescents living in the Southeastern United States. Participants were
primarily European American (91%) and 51% were girls. Both parents and peers were important influences on the choice to abstain
from antisocial behavior. Over the four-year period adolescents relied increasingly on parents as influences and relied less
on peers as influences to deter antisocial behavior. Significant gender differences emerged and suggested that female adolescents
relied more on social influences than did male adolescents but that as time progressed male adolescents increased the rate
at which they relied on peers. Higher family income was associated with choosing peers as a social influence at wave 1, but
no other significant income associations were found. Understanding influences on adolescents’ abstinence choices is important
for preventing antisocial behavior.
Emily C. Cook is in her final year of doctoral studies in human development and family studies at the University of North Carolina at Greensboro. Her research interests include peer influences and parental influences on adolescents’ problem behaviors, parental influences on adolescents’ social development, and effective prevention and interventions for adolescents who exhibit problem behaviors. Cheryl Buehler is a professor of human development and family studies at the University of North Carolina at Greensboro. Her research interests include marital conflict, marital relations, parenting, and adolescent well-being. Robert Henson is an assistant professor of educational research methodology at the University of North Carolina at Greensboro. Dr. Henson’s research interests include educational measurement, cognitive diagnosis models, hierarchical linear models, and mathematical statistics. 相似文献
Emily C. CookEmail: |
Emily C. Cook is in her final year of doctoral studies in human development and family studies at the University of North Carolina at Greensboro. Her research interests include peer influences and parental influences on adolescents’ problem behaviors, parental influences on adolescents’ social development, and effective prevention and interventions for adolescents who exhibit problem behaviors. Cheryl Buehler is a professor of human development and family studies at the University of North Carolina at Greensboro. Her research interests include marital conflict, marital relations, parenting, and adolescent well-being. Robert Henson is an assistant professor of educational research methodology at the University of North Carolina at Greensboro. Dr. Henson’s research interests include educational measurement, cognitive diagnosis models, hierarchical linear models, and mathematical statistics. 相似文献