全文获取类型
收费全文 | 32718篇 |
免费 | 585篇 |
国内免费 | 1篇 |
专业分类
管理学 | 4463篇 |
民族学 | 176篇 |
人才学 | 4篇 |
人口学 | 4370篇 |
丛书文集 | 100篇 |
教育普及 | 1篇 |
理论方法论 | 2556篇 |
综合类 | 707篇 |
社会学 | 14710篇 |
统计学 | 6217篇 |
出版年
2023年 | 121篇 |
2021年 | 158篇 |
2020年 | 326篇 |
2019年 | 432篇 |
2018年 | 2108篇 |
2017年 | 2359篇 |
2016年 | 1575篇 |
2015年 | 471篇 |
2014年 | 583篇 |
2013年 | 4071篇 |
2012年 | 1075篇 |
2011年 | 1682篇 |
2010年 | 1516篇 |
2009年 | 1179篇 |
2008年 | 1286篇 |
2007年 | 1451篇 |
2006年 | 507篇 |
2005年 | 730篇 |
2004年 | 684篇 |
2003年 | 656篇 |
2002年 | 592篇 |
2001年 | 605篇 |
2000年 | 569篇 |
1999年 | 543篇 |
1998年 | 418篇 |
1997年 | 343篇 |
1996年 | 440篇 |
1995年 | 332篇 |
1994年 | 336篇 |
1993年 | 332篇 |
1992年 | 387篇 |
1991年 | 384篇 |
1990年 | 365篇 |
1989年 | 322篇 |
1988年 | 350篇 |
1987年 | 329篇 |
1986年 | 288篇 |
1985年 | 345篇 |
1984年 | 317篇 |
1983年 | 312篇 |
1982年 | 225篇 |
1981年 | 196篇 |
1980年 | 186篇 |
1979年 | 229篇 |
1978年 | 195篇 |
1977年 | 160篇 |
1976年 | 125篇 |
1975年 | 144篇 |
1974年 | 146篇 |
1973年 | 114篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
In 1985, the National Institute on Drug Abuse (NIDA) funded an ethnographic research project in San Francisco to study the needle sharing behavior of injection drug users (IDUs). The goal of the research was to develop a strategy to slow the spread of HIV among this hidden and hard to reach population of drug users and their sexual partners. This small-scale project grew into a model intervention in which bleach, condoms, and street-based education by outreach workers were employed to inform IDUs of the risk of AIDS and of methods for protecting themselves. The "reach and teach bleach" model was adopted by NIDA and implemented in a number of American cities. This study describes the development of the model intervention, the adoption of the model by NIDA as part of its National AIDS Demonstration Research (NADR) project, and the political circumstances under which the city of San Francisco applied for the NADR grant. Drawing on Social Worlds/Arena theory, and based on extensive interviews and participant observation, a sociohistorical analysis examines the initial development, implementation, and disintegration of the model outreach project and the impact of the program on drug policy in the city of San Francisco. 相似文献
92.
Abstract It is well recognized that the informal economy—unregulated economic activities that generate real or in-kind income—features prominently in the day-to-day lives of many in the developing world. Researchers have begun to explore the informal economy in developed countries but this work has focussed primarily on urban areas to the neglect of rural areas. In this paper the nature and correlates of informal work in nonmetropolitan Pennsylvania are described through an analysis of survey data on 505 families. Results indicate that participation in informal activities is widespread, is not more typical of the poor, does not contribute greatly to family income on average but does help many poor families weather difficult economic times, is both economically and noneconomically motivated, and, net of other sociodemographic variables, is positively related to rurality of residence and formal labor supply. 相似文献
93.
This study examines the influence of the socialization of aggression among different gender and social class groupings and the influence of psychosocial stage on cognitive developmental play preferences among groups of school aged children. Observations of 143 play groups were coded for play preference (symbolic play, practice play, games with rules) and play performance (cooperative or competitive). Findings of the log-linear data analysis suggest a middle class and masculine bias in Piaget's cognitive model (i.e., that as age increases children prefer more games with rules). This model held only for middle class and affluent boys. Girls (both latency and prepubertal) and lower socioeconomic groups tended to prefer practice play. Girls were more likely to play cooperatively; boys more likely to play competitively. Implications for theory development and clinical practice are explored. 相似文献
94.
We propose some estimators of noncentrality parameters which improve upon usual unbiased estimators under quadratic loss. The distributions we consider are the noncentral chi-square and the noncentral F. However, we give more general results for the family of elliptically contoured distributions and propose a robust dominating estimator. 相似文献
95.
96.
97.
98.
This article examines trends in divorce attitudes of young adult women in the United States by educational attainment from 1974 to 2002. Women with 4‐year college degrees, who previously had the most permissive attitudes toward divorce, have become more restrictive in their attitudes toward divorce than high school graduates and women with some college education, whereas women with no high school diplomas have increasingly permissive attitudes toward divorce. We examine this educational crossover in divorce attitudes in the context of variables correlated with women's educational attainment, including family attitudes and religion, income and occupational prestige, and family structure. We conclude that the educational crossover in divorce attitudes is associated most strongly with work and family structure variables. 相似文献
99.
Ramesh Raghavan Arleen A. Leibowitz Ronald M. Andersen Bonnie T. Zima Mark A. Schuster John Landsverk 《Children and youth services review》2006,28(12):1482-1496
Children in the child welfare system are dependent upon Medicaid to finance services for their considerable mental health needs. This study examines the effects of Medicaid policies on mental health service use among a national probability sample of children in the child welfare system. Data for this study came from the National Survey of Child and Adolescent Well-Being, the Caring for Children in Child Welfare study, and the Area Resource File. Weighted multivariate logistic regression analyses were conducted to estimate effects of policy variables on children's use of mental health services, controlling for child-level covariates and county-level health resources. Children in counties with behavioral carve-outs under Medicaid managed care had lower odds of inpatient mental health service use. Medicaid managed care enrollment and variations in type of provider reimbursement did not affect use of mental health services. Older age, greater need for mental health services, and higher levels of caregiver education were associated with increased odds of service use. Restrictions on use of inpatient mental healthcare caused by behavioral carve-outs may disproportionately affect children in the child welfare system who have high rates of such use. Careful adoption of carve-outs is necessary to assure appropriate care for these children. 相似文献
100.
Kevin P. Scheibe Brian E. Mennecke Christopher W. Zobel 《Journal of Labor Research》2006,27(3):275-290
Outsourcing of IT functions has become a widespread corporate practice, which has naturally led to concerns among IT works about how this affects their jobs. The issue is complex, and many companies are bringing their IT functions back inhouse. In light of this complexity, what skills do IT workers need to be com-petitive? We address this question first by reviewing the literature and then by examining two corporate case studies that have dealt with outsourcing issues. Based on this view of outsourcing, we discuss the skills that can provide a com-petitive advantage in the current environment. 相似文献