首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1279篇
  免费   50篇
管理学   136篇
民族学   8篇
人口学   118篇
丛书文集   11篇
理论方法论   142篇
综合类   7篇
社会学   783篇
统计学   124篇
  2023年   13篇
  2022年   9篇
  2021年   13篇
  2020年   27篇
  2019年   21篇
  2018年   37篇
  2017年   66篇
  2016年   50篇
  2015年   24篇
  2014年   40篇
  2013年   199篇
  2012年   56篇
  2011年   59篇
  2010年   44篇
  2009年   40篇
  2008年   54篇
  2007年   49篇
  2006年   58篇
  2005年   43篇
  2004年   49篇
  2003年   41篇
  2002年   38篇
  2001年   22篇
  2000年   19篇
  1999年   22篇
  1998年   17篇
  1997年   19篇
  1996年   17篇
  1995年   14篇
  1994年   11篇
  1993年   10篇
  1992年   11篇
  1991年   14篇
  1990年   5篇
  1989年   12篇
  1988年   9篇
  1987年   12篇
  1986年   7篇
  1985年   7篇
  1984年   9篇
  1983年   10篇
  1982年   8篇
  1980年   6篇
  1979年   6篇
  1977年   4篇
  1976年   3篇
  1975年   3篇
  1974年   5篇
  1970年   3篇
  1969年   3篇
排序方式: 共有1329条查询结果,搜索用时 15 毫秒
991.
Given that gaining access to external resources is a critical component of entrepreneurial activity, a great deal of research has been done in an attempt to predict and explain this phenomenon. Unfortunately, this literature is largely scattered across a wide variety of somewhat disconnected research streams, which makes interpreting the insights that have been hitherto gained challenging. In response, the authors identify a sample of 76 relevant articles from the leading management and entrepreneurship journals that examine entrepreneurial access to resources. Using a narrative synthesis approach, they then organize these articles based on the strategies (projective and/or interpersonal) and tools (words, actions, associations and/or intangibles) by which entrepreneurs gain access to resources. Based on this categorization, the authors discuss the major themes in the extant literature and offer suggestions for how to move research on entrepreneurial access forward in the future.  相似文献   
992.
Vinyl chloride (VC) was used as a propellant in a limited percentage of aerosol hairspray products in the United States from approximately 1967 to 1973. The question has arisen whether occupational exposures of hairdressers to VC-containing hairsprays in hair salons were sufficient to increase the risk for developing hepatic angiosarcoma (HAS). Transient two-zone and steady-state three-zone models were used to estimate the historical airborne concentration of VC for individual hairdressers using hairspray as well as estimated contributions from other hairdressers in the same salon. Concentrations of VC were modeled for small, medium, and large salons, as well as a representative home salon. Model inputs were determined using published literature, and variability in these inputs was also considered using Monte Carlo techniques. The 95th percentile for the daily time-weighted average exposure for small, medium, and large salons, assuming a market-share fraction of VC-containing hairspray use from the Monte Carlo analysis, was about 0.3 ppm, and for the home salon scenario was 0.1 ppm. The 95th percentile value for the cumulative lifetime exposure of the hairdressers was 2.8 ppm-years for the home salon scenario and 2.0 ppm-years for the small, medium, and large salon scenarios. If using the assumption that all hairsprays used in a salon contained VC, the 95th percentile of the theoretical lifetime cumulative dose was estimated to be 52–79 ppm-years. Estimated lifetime doses were all below the threshold dose for HAS of about 300 to 500 ppm-years reported in the published epidemiology literature.  相似文献   
993.
This study analyzed the resource characteristics of a sample of university foundations and identified five distinct strategic groups. We found significant performance differences among them. Specifically, the group that focused most heavily on fundraising activities had the highest financial performance. Also performing well was the group with the highest ratio of contributions to total revenues combined with the highest level of slack. The research and managerial implications of this study's findings are discussed.  相似文献   
994.
Utilizing a diverse sample of 356 four-year-old children attending Head Start, this study examined the degree to which behavioral aspects of school readiness, including classroom participation, prosocial behavior, and aggression control were related to direct assessments of child cognitive readiness (academic knowledge, executive function skills) at the start of the prekindergarten year. Classroom participation and prosocial behavior each accounted for unique variance in cognitive readiness. Aggressive behavior, in contrast, was not correlated with academic knowledge, and was associated with low levels of executive function skills. In multiple regressions, aggressive behavior paradoxically enhanced the prediction of child cognitive readiness. Profile analyses strengthened the conclusion that the promotion of competencies associated with classroom participation and prosocial behavior may be particularly critical to cognitive readiness in prekindergarten. Implications are discussed for developmental models of school readiness and preschool classroom practice.  相似文献   
995.
Simplifying Regression Models Using Dimensional Analysis   总被引:1,自引:0,他引:1  
Dimensional analysis can make a contribution to model formulation when some of the measurements in the problem are of physical factors. The analysis constructs a set of independent dimensionless factors that should be used as the variables of the regression in place of the original measurements. There are fewer of these than the originals and they often have a more appropriate interpretation. The technique is described briefly and its proposed role in regression discussed and illustrated with examples. We conclude that dimensional analysis can be effective in the preliminary stages of regression analysis whendeveloping formulations involving continuous variables with several dimensions.  相似文献   
996.
This paper shows that many of the most distinctive features of Keynesian economics are best understood if one views the General Theory as essentially a gold standard model. A close examination of Keynes's statements on contemporaneous policy issues suggests that the gold standard had a profound impact on his views on monetary policy effectiveness. In particular, I show that the liquidity trap has been widely misunderstood. Finally, I argue that post–General Theory developments in Keynesian economics are best understood as a response to the inapplicability of Keynes's original message to a world of fiat money regimes. ( JEL B22, E12, N1)  相似文献   
997.
998.
999.
Beyond taxonomy     
Much of the considerable confusion about the definition of social entrepreneurship in academic literature stems from a lack of empirical research on the subject. This article advances social entrepreneurship research beyond conceptualization discussions by developing and validating an instrument that quantifies the incidence of nonprofit entrepreneurial behavior. Information from 145 Kansas City Metropolitan Area nonprofit organizations was collected to validate the underlying constructs represented in the instrument. Behavior differences were depicted between entrepreneurial and nonentrepreneurial nonprofits. Using principal component factor analysis, the research illustrates social entrepreneurship as a unique nonprofit behavior that occurs at the intersection of innovation, proactiveness, and risk taking.  相似文献   
1000.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号