全文获取类型
收费全文 | 10646篇 |
免费 | 301篇 |
国内免费 | 2篇 |
专业分类
管理学 | 1492篇 |
民族学 | 63篇 |
人才学 | 3篇 |
人口学 | 963篇 |
丛书文集 | 70篇 |
理论方法论 | 1075篇 |
综合类 | 225篇 |
社会学 | 5476篇 |
统计学 | 1582篇 |
出版年
2020年 | 152篇 |
2019年 | 249篇 |
2018年 | 261篇 |
2017年 | 371篇 |
2016年 | 260篇 |
2015年 | 199篇 |
2014年 | 253篇 |
2013年 | 1736篇 |
2012年 | 351篇 |
2011年 | 338篇 |
2010年 | 271篇 |
2009年 | 261篇 |
2008年 | 250篇 |
2007年 | 291篇 |
2006年 | 262篇 |
2005年 | 264篇 |
2004年 | 244篇 |
2003年 | 178篇 |
2002年 | 214篇 |
2001年 | 274篇 |
2000年 | 231篇 |
1999年 | 210篇 |
1998年 | 168篇 |
1997年 | 157篇 |
1996年 | 154篇 |
1995年 | 144篇 |
1994年 | 149篇 |
1993年 | 149篇 |
1992年 | 151篇 |
1991年 | 148篇 |
1990年 | 152篇 |
1989年 | 147篇 |
1988年 | 133篇 |
1987年 | 148篇 |
1986年 | 116篇 |
1985年 | 147篇 |
1984年 | 156篇 |
1983年 | 141篇 |
1982年 | 123篇 |
1981年 | 89篇 |
1980年 | 111篇 |
1979年 | 113篇 |
1978年 | 102篇 |
1977年 | 86篇 |
1976年 | 88篇 |
1975年 | 99篇 |
1974年 | 94篇 |
1973年 | 69篇 |
1972年 | 61篇 |
1971年 | 53篇 |
排序方式: 共有10000条查询结果,搜索用时 515 毫秒
991.
992.
Mona S. Schatz Lowell E. Jenkins Bradford W. Sheafor 《Journal of Social Work Education》2013,49(3):217-231
Abstract Social work has long sought a conceptual framework to describe its most basic approach to service delivery: generalist social work practice. A milestone in that process was the series of Milford conferences in the 1920s during which the elements of “generic casework” were first identified. This article presents a model that advances and clarifies the concepts of generalist social work as viewed at the beginning of the 1990s. Generalist social work at both the initial and advanced levels involves a way of viewing practice. It is a perspective that focuses on the interface between systems, on a client-centered and problem-focused philosophy, and on an openness to multiple theories and approaches for improving people's well-being. Practice at the initial level requires a set of competencies necessary to provide services consistent with the understanding derived from the perspective. Advanced generalist social work represents increased complexity in the learning process and greater breadth and depth of exploration in a generalist perspective rather than a uniquely different perspective from the generalist approach. 相似文献
993.
Logistic objectives constitute a compromise between having short leadtimes and a low volume of work in progress on the one hand and a high resource loading and due date obligation on the other. Miscellaneous production planning approaches offered today provide different combinations of logistic objectives for satisfying a manufacturing strategy. To combine the strength of the various approaches into a unified system, a new approach based on a dynamic and distributed production planning methodology is proposed. To customize the approach, various analyses and specifications have to be made and for that reason some important characteristics and criteria for analysing production control philosophies will be given. 相似文献
994.
995.
996.
The remnants of three almost forgotten empires (British, French and Dutch) in the North Eastern Caribbean provide some remarkable contrasts in styles of governing, notwithstanding a good deal of common ground among the resident communities. Two of these remnants actually share a single island, and the third, on another small island, is not far away. Problems and issues are identified, and a solution suggested for overcoming some of them. 相似文献
997.
This paper develops a finite-lifetime continuous-time model of human capital acquisition. Exogenous technological progress has two aspects, a knowledge frontier and an ease-of-learning parameter. We find that as lifespan increases: (1) output per person-hour rises in a concave fashion, and (2) learning during the work-phase of life only occurs when individuals have a sufficiently long lifespan. As a result, countries that differ in the average lifespan of their inhabitants can have permanently different levels of output per person even in the presence of free trade, perfect capital markets and common production functions. ( JEL O33, J24, F43, D91) 相似文献
998.
This research presents the results of two related studies on the convergent and construct validity of three measures of reciprocity in exchange relationships at work. In Study 1, 71 Dutch teachers were interviewed about their specific investments and outcomes in the exchange relationships with their students, colleagues and school. ANOVA revealed that they reported significantly more investments than outcomes, and that the number of reported investments and outcomes mentioned varied as a function of the type of exchange relationship. Building on these results, multi-item scales were created to assess reciprocity at a detailed level for each of the three exchange relationships. Study 2 validated these specific reciprocity measures by relating them to two global assessments of reciprocity (convergent validity) as well as to measures of job stress and well-being (construct validity). LISREL-analysis of data obtained from a further sample of 224 teachers revealed that for each type of exchange relationship there were significant, consistent and meaningful relationships among the three reciprocity measures. Further, hierarchical regression analysis showed that the reciprocity measures were differentially related to job stressors and measures of well-being. Implications are discussed. 相似文献
999.
SCHOLTE E. M.; COLTON M.; CASAS F.; DRAKEFORD M.; ROBERTS S.; WILLIAMS M. 《British Journal of Social Work》1999,29(3):373-391
Correspondence to Dr E. M. Scholte, Department of Social and Behavioural Sciences/Centre for Research on Youth Welfare, University of Leiden, PO Box 9555, 2300 RB Leiden, The Netherlands. Summary This paper explores the perceptions of social disqualificationor stigma that service users attributed to publicchild welfare services in random samples of service users takenfrom the Netherlands, a part of Spain (Catalonia) and a partof the United Kingdom (Wales). It was found that, in all threesamples, foster and residential care invoked the greatest senseof stigma, while the health related and the preventive familyservices were perceived as the least stigmatizing types of publicwelfare services. Comparative analysis further revealed thata positive attitude towards the use of public welfare services,a perception of supportive or non-stigmatizing social normsregarding the use of such services, and a perception of publicwelfare services as helpful correlated in all three sampleswith higher levels of user satisfaction and involvement in theservices. It was further found that, in the British and Spanishsamples, a positive attitude towards public welfare services,as well as a perception of public welfare services as helpfulfor their recipients, were the predominating factors promotinghigher levels of satisfactory user involvement in the services,while, in the Dutch sample, a perception of supportive socialnorms was the factor that most promoted satisfactory user involvement. 相似文献
1000.
Optimal three-stage designs with equal sample sizes at each stage are presented and compared to fixed sample designs, fully sequential designs, designs restricted to use the fixed sample critical value at the final stage, and to modifications of other group sequential designs previously proposed in the literature. Typically, the greatest savings realized with interim analyses are obtained by the first interim look. More than 50% of the savings possible with a fully sequential design can be realized with a simple two-stage design. Three-stage designs can realize as much as 75% of the possible savings. Without much loss in efficiency, the designs can be modified so that the critical value at the final stage equals the usual fixed sample value while maintaining the overall level of significance, alleviating some potential confusion should a final stage be necessary. Some common group sequential designs, modified to allow early acceptance of the null hypothesis, are shown to be nearly optimal in some settings while performing poorly in others. An example is given to illustrate the use of several three-stage plans in the design of clinical trials. 相似文献