全文获取类型
收费全文 | 10449篇 |
免费 | 1篇 |
专业分类
管理学 | 1508篇 |
民族学 | 100篇 |
人口学 | 2408篇 |
理论方法论 | 500篇 |
综合类 | 287篇 |
社会学 | 4453篇 |
统计学 | 1194篇 |
出版年
2021年 | 1篇 |
2019年 | 3篇 |
2018年 | 1659篇 |
2017年 | 1650篇 |
2016年 | 1074篇 |
2015年 | 33篇 |
2014年 | 33篇 |
2013年 | 47篇 |
2012年 | 319篇 |
2011年 | 1147篇 |
2010年 | 1044篇 |
2009年 | 781篇 |
2008年 | 818篇 |
2007年 | 996篇 |
2006年 | 1篇 |
2005年 | 227篇 |
2004年 | 253篇 |
2003年 | 210篇 |
2002年 | 82篇 |
2001年 | 6篇 |
2000年 | 13篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1996年 | 28篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1988年 | 8篇 |
1987年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This study assesses whether the influences of attitude towards deviance, exposure to delinquent peers and parental supervision
and encouragement on antisocial behavior are moderated by depressive symptoms. Two hundred and thirty eight African American
adolescents ages 13–19 from three public housing developments participated in this study. Results indicate that approximately
half of the youth did not engage in antisocial behaviors in the last year. Gender, depression, attitudes and peers were significant
correlates of antisocial behavior. Parental supervision and encouragement, and age were not related to antisocial behavior.
Interaction effects suggest that the relative influences of attitudes towards deviance and delinquent peers on antisocial
behaviors depend upon gender and level of depression symptoms. Implications for social work practice and future research are
discussed. 相似文献
992.
993.
We construct a model of rational choice under risk with biased risk judgement. On its basis, we argue that sometimes, a regulator
aiming at maximising social welfare should affect the environment in such a way that it becomes ‘less safe’ in common perception.
More specifically, we introduce a bias into each agent’s choice of optimal risk levels: consequently, in certain environments,
agents choose a behaviour that realises higher risks than intended. Individuals incur a welfare loss through this bias. We
show that by deteriorating the environment, the regulator can motivate individuals to choose behaviour that is less biased,
and hence realises risk levels closer to what individuals intended. We formally investigate the conditions under which such
a Beneficial Safety Decrease—i.e. a deteriorating intervention that has a positive welfare effect—exists. Finally, we discuss
three applications of our model. 相似文献
994.
Dongdong Ge Simai He Yinyu Ye Jiawei Zhang 《Journal of Combinatorial Optimization》2011,22(4):699-725
We develop a new dependent randomized rounding method for approximation of a number of optimization problems with integral
assignment constraints. The core of the method is a simple, intuitive, and computationally efficient geometric rounding that
simultaneously rounds multiple points in a multi-dimensional simplex to its vertices. Using this method we obtain in a systematic
way known as well as new results for the hub location, metric labeling, winner determination and consistent labeling problems.
A comprehensive comparison to the dependent randomized rounding method developed by Kleinberg and Tardos (J. ACM 49(5):616–639,
2002) and its variants is also conducted. Overall, our geometric rounding provides a simple and effective alternative for rounding
various integer optimization problems. 相似文献
995.
Terry McNulty Andrew Pettigrew Greg Jobome Clare Morris 《Journal of Management and Governance》2011,15(1):91-121
This paper develops an analytical framework to depict the heterogeneity that characterises the role of board chair and demonstrate
the potential variability in how chairs operate boards and exercise power and influence on strategy, control and resource
related tasks at board level. Theories of power and influence, as applied to top management teams and boards of directors,
are explicated within the context of contemporary governance practices that are establishing the role of the board chair as
distinct to that of the chief executive officer. Specifically, the paper maps sources of power and varying contemporary chair
practices, including chair nomenclature (i.e. executive vs. non-executive chairs), chair origin (insider vs. outsider) and
chair time (full-time vs. part-time). A number of theoretical chair-power models emerge from this analysis and are subject
to empirical analysis using data collected from 160 chairs of 500 FTSE-listed companies. Theoretically and empirically, the
paper complements structural approaches to studying boards with attention to behaviour on boards. By linking board structure,
board process and the exercise of influence, the study reveals both differences amongst chairs in how they run the board,
but also that chairs’ differ in the influence they exert on board-related tasks. Full-time executive chairs exert their greatest
influence in strategy and resource dependence tasks whereas part-time, non-executive chairs seem to exert more influence over
monitoring and control tasks. 相似文献
996.
Using a large stated preference survey conducted across the U.S. and Canada, we assess differences in individual willingness
to pay (WTP) for health risk reductions between the two countries. Our utility-theoretic choice model allows for systematically varying
marginal utilities for avoided future time in different adverse health states (illness-years, recovered/remission years, and
lost life-years). We find significant differences between Canadian and U.S. preferences. WTP also differs systematically with age, gender, education, and marital status, as well as a number of attitudinal and subjective
health-perception variables. Age profiles for WTP are markedly different across the two countries. Canadians tend to display flatter age profiles, with peak WTP realized at older ages. 相似文献
997.
Consider partitions of a given set A of n distinct points in general position in ℝ
d
into parts where each pair of parts can be separated by a hyperplane that contains a given set of points E. We consider the problem of counting and generating all such partitions (correcting a classic 1967 result of Harding about
the number of such partitions into two parts). Applications of the result to partition problems are presented. 相似文献
998.
999.
Frank Heiland Alexia Prskawetz Warren C. Sanderson 《Revue europeenne de demographie》2008,24(2):129-156
Using West German panel data constructed from the 1988 and 1994/1995 wave of the DJI Familiensurvey, we analyze the stability
and determinants of individuals’ total desired fertility. We find considerable variation of total desired fertility across
respondents and across interviews. In particular, up to 50% of individuals report a different total desired fertility across
survey waves. Multivariate analysis confirms the importance of background factors including growing up with both parents,
having more siblings, and being Catholic for preference formation. Consistent with the idea that life course experiences provide
new information regarding the expected costs and benefits of different family sizes, the influence of background factors on
total desired fertility is strong early in life and weakens as subsequent life course experiences, including childbearing,
take effect. Accounting for unobserved individual heterogeneity, we estimate that an additional child may increase the total
desired fertility of women with children by 0.14 children, less than what conventional estimates from cross-sectional data
would have suggested. 相似文献
1000.