全文获取类型
收费全文 | 17147篇 |
免费 | 293篇 |
专业分类
管理学 | 2477篇 |
民族学 | 89篇 |
人才学 | 4篇 |
人口学 | 1710篇 |
丛书文集 | 96篇 |
教育普及 | 1篇 |
理论方法论 | 1659篇 |
现状及发展 | 1篇 |
综合类 | 187篇 |
社会学 | 8289篇 |
统计学 | 2927篇 |
出版年
2023年 | 101篇 |
2021年 | 81篇 |
2020年 | 261篇 |
2019年 | 335篇 |
2018年 | 355篇 |
2017年 | 518篇 |
2016年 | 435篇 |
2015年 | 292篇 |
2014年 | 386篇 |
2013年 | 2926篇 |
2012年 | 553篇 |
2011年 | 465篇 |
2010年 | 398篇 |
2009年 | 402篇 |
2008年 | 449篇 |
2007年 | 434篇 |
2006年 | 400篇 |
2005年 | 433篇 |
2004年 | 450篇 |
2003年 | 393篇 |
2002年 | 433篇 |
2001年 | 430篇 |
2000年 | 410篇 |
1999年 | 396篇 |
1998年 | 298篇 |
1997年 | 267篇 |
1996年 | 251篇 |
1995年 | 251篇 |
1994年 | 222篇 |
1993年 | 248篇 |
1992年 | 246篇 |
1991年 | 233篇 |
1990年 | 214篇 |
1989年 | 239篇 |
1988年 | 215篇 |
1987年 | 186篇 |
1986年 | 206篇 |
1985年 | 238篇 |
1984年 | 225篇 |
1983年 | 213篇 |
1982年 | 180篇 |
1981年 | 153篇 |
1980年 | 149篇 |
1979年 | 177篇 |
1978年 | 132篇 |
1977年 | 131篇 |
1976年 | 136篇 |
1975年 | 128篇 |
1974年 | 109篇 |
1973年 | 103篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
771.
772.
773.
Using data from 7272 adolescent US girls, we explore how girls’ race/ethnic group status affects their bodyweight, perceptions of overweight, and weight control practices. We hypothesize that a girl’s race/ethnic status influences her basic identity which in turn prompts her to adopt or reject a “drive for thinness.” After controlling for family and peer support, school engagement, family SES, maturation, and family structure, we find that girls’ race/ethnic status influences their susceptibility to the thinness ideals of mainstream culture. African American girls weigh more than Asian, Hispanic, or White girls, but at any given weight they perceive themselves as overweight and attempt to control their weight less. Asian American and White girls invest most in thinness dynamics. Some evidence also suggests girls from lower SES families are less driven to be thin. Our results affirm the utility of viewing material bodies as “situations” that are experienced and interpreted in accord with identity group relations and dynamics. 相似文献
774.
The present study examined the relationships between caregivers' self‐reported positive and negative emotional expressiveness, observer assessments of children's emotion regulation, and teachers' reports of children's internalizing and externalizing behaviors in a sample of 97 primarily African American and Hispanic Head Start families. Results indicated that higher caregiver negativity and lower child emotion regulation independently predicted more internalizing behavior problems in children. Additionally, children's externalizing behavior problems were negatively predicted by caregivers' self‐reports of positive emotional expressiveness. Importantly, results also suggested that caregivers' emotional expressiveness and children's behavioral problems may be non‐linearly related, and that child gender may play an important moderating role. These results emphasize the importance of family emotional climate and child emotion regulation in the behavioral development of preschool‐age children, and highlight the need for improved theoretical and practical understanding of socioemotional development in diverse populations. 相似文献
775.
Chris John Shepherd 《East Asian Science, Technology and Society: An International Journal》2009,3(2-3):315-342
The anthropology of development seeks to understand the complex encounter between international and national development regimes and local patterns of livelihood and being. As science and development move objects, at once material and discursive, through the networks of the social to reach “impoverished” others, local groups reach out to development actors to evaluate and appropriate their resources and accept or redirect those efforts. In a political interplay of disciplinary measures and localizing translations, development projects are re-invented, or aspects thereof refused, just as development actors strain to keep projects on track. With input from science and technology studies, this article explores the participatory, authoritative, and distributive dimensions to agricultural development in East Timor. Across four cases studies—a dairy, a greenhouse, a seed development program, and a permanent farming initiative—the politics of projects are compared and discussed within the broader context of colonial and postcolonial development. The article is based on a total of 1 year of fieldwork conducted in 2003, 2008, and 2009. 相似文献
776.
Eric G. Lambert Nancy L. Hogan O. Oko Elechi Shanhe Jiang John M. Laux Paula Dupuy Angela Morris 《The Social Science Journal》2009
Working in corrections is not only a demanding job, but a socially important one. While a growing number of studies have examined how the work environment impacts the job stress, job satisfaction, and organizational commitment of staff, very few studies have examined how working in corrections impacts the life satisfaction of workers. The current study utilized OLS regression to examine the antecedents of life satisfaction among staff at a Midwestern private prison. Job satisfaction had a positive relationship with life satisfaction, while age, work on family conflict, family on work conflict, and job involvement all had statistically significant negative effects. Finally, perceptions of the level of financial rewards, job stress, organizational commitment, gender, race, educational level, tenure, supervisory status, position, marital status, and having children, all had non-significant associations with overall satisfaction with life. 相似文献
777.
Curtis M. Jolly Budry Bayard Richard T. Awuah Simon C. Fialor Johnathan T. Williams 《Journal of Socio》2009,38(2):280-287
This study uses a modified health belief model (HBM) within a socio-economic framework to evaluate the influence of awareness and knowledge on actions to reduce aflatoxin (AF) contamination in groundnuts (peanuts). Data were collected in 2002 through a self-administered questionnaire from a sample of 367 individuals. Socio-economic factors affecting perceptions, awareness, knowledge, and action were examined using structural equation modeling. The perceived benefits of good quality groundnuts and/or groundnut products were the most important determinants of awareness and knowledge of AF among agricultural and health professionals in Ghana. Awareness, in turn, had a significant causal effect on the professionals’ decisions to take actions to increase the level of awareness of AF in the society. Demographic factors, such as gender and level of education significantly influenced knowledge of AF and the perception of the benefits of good quality groundnut. Type of profession had a significant influence on awareness and perceived seriousness of the AF problem. Education was a significant determinant of awareness of AF in groundnuts. The study generates important information for policy decision making when considering resource allocation to reduce food contamination in developing economies. 相似文献
778.
Fabio Lopez Chiara Di Bartolo Tommaso Piazza Antonino Passannanti Jörg C. Gerlach Bruno Gridelli Fabio Triolo 《Risk analysis》2010,30(12):1857-1871
International regulatory authorities view risk management as an essential production need for the development of innovative, somatic cell‐based therapies in regenerative medicine. The available risk management guidelines, however, provide little guidance on specific risk analysis approaches and procedures applicable in clinical cell therapy manufacturing. This raises a number of problems. Cell manufacturing is a poorly automated process, prone to operator‐introduced variations, and affected by heterogeneity of the processed organs/tissues and lot‐dependent variability of reagent (e.g., collagenase) efficiency. In this study, the principal challenges faced in a cell‐based product manufacturing context (i.e., high dependence on human intervention and absence of reference standards for acceptable risk levels) are identified and addressed, and a risk management model approach applicable to manufacturing of cells for clinical use is described for the first time. The use of the heuristic and pseudo‐quantitative failure mode and effect analysis/failure mode and critical effect analysis risk analysis technique associated with direct estimation of severity, occurrence, and detection is, in this specific context, as effective as, but more efficient than, the analytic hierarchy process. Moreover, a severity/occurrence matrix and Pareto analysis can be successfully adopted to identify priority failure modes on which to act to mitigate risks. The application of this approach to clinical cell therapy manufacturing in regenerative medicine is also discussed. 相似文献
779.
Social skills and symbol skills are positively associated in middle childhood, but the relation between these domains is less clear in newly verbal toddlers. Vygotsky proposed that symbols are both tools for interaction and mental tools for thought. Do symbols help even very young children build skills for interacting with and conceptualizing the social world? Longitudinal data from 108 children and mothers were collected when children were 14, 24, and 36 months. Children's gestures and words during mother–child interactions were used as symbol skill indicators to predict children's abilities to engage others and the number of social‐emotional concepts children portray during play. In a series of growth models, words had a stronger effect on engagement skills whereas early gesture use predicted later development of social‐emotional concepts. Therefore, even in early development, symbols serve as both communication tools and mental tools to construct understanding of the social‐emotional world. 相似文献
780.
John Welshman 《Child & Family Social Work》2011,16(2):244-244