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   615篇
  免费   20篇
管理学   69篇
人口学   35篇
丛书文集   2篇
理论方法论   42篇
综合类   12篇
社会学   323篇
统计学   152篇
  2022年   3篇
  2021年   3篇
  2020年   7篇
  2019年   7篇
  2018年   21篇
  2017年   21篇
  2016年   19篇
  2015年   15篇
  2014年   19篇
  2013年   133篇
  2012年   31篇
  2011年   25篇
  2010年   13篇
  2009年   11篇
  2008年   16篇
  2007年   19篇
  2006年   21篇
  2005年   15篇
  2004年   8篇
  2003年   14篇
  2002年   16篇
  2001年   16篇
  2000年   13篇
  1999年   16篇
  1998年   14篇
  1997年   8篇
  1996年   10篇
  1995年   5篇
  1994年   6篇
  1993年   3篇
  1992年   8篇
  1991年   5篇
  1990年   4篇
  1989年   5篇
  1988年   4篇
  1987年   6篇
  1986年   5篇
  1985年   5篇
  1984年   5篇
  1983年   3篇
  1982年   4篇
  1981年   9篇
  1980年   6篇
  1979年   5篇
  1978年   7篇
  1977年   3篇
  1975年   6篇
  1969年   3篇
  1968年   4篇
  1965年   2篇
排序方式: 共有635条查询结果,搜索用时 15 毫秒
21.
Urban development has profound impacts on ecological patterns and processes making the scientific information required for developing environmental ordinances central for mitigating these negative ecological impacts. Washington State requires that planners use the best available science (BAS) to formulate land use ordinances as part of the state’s Growth Management Act (GMA). We present empirical findings describing challenges to planners in defining “best available science” and using BAS to create local ordinances that balance development needs with natural resource protection. We interviewed city and county planners (and their consultants) in western Washington to determine what they find useful about BAS, whether or not BAS is applicable to their jurisdictions, and what constraints they experience in reviewing and using BAS to create or update their land use ordinances. Our results suggest that applying the BAS requirement is particularly difficult in urban areas. Specifically, planners had difficulty applying results from research conducted in systems dissimilar to their urban landscapes. These challenges to planners were exacerbated by (1) a lack of resources and (2) political tensions among stakeholders with competing values in urban settings. We conclude with recommendations for improving the consideration of science in statewide land-use planning.  相似文献   
22.
This article employs the process of critical reflection to uncover and challenge the hegemonic assumptions of evidence-based practice (EBP). The critical reflection process results in a re-conceptualisation of best practices that, while still honouring empirical research, is less hierarchical and more inclusive of a broad spectrum of interests than traditional EBP. Multidimensional Evidence-Based Practice (MEBP) validates consumer wisdom, professional experience, and qualitative research as equal partners to quantitative research in determining current state-of-the art best practices. Furthermore, MEBP incorporates a value-critical analysis of those best practices that can lead to improvements and innovations, so that ‘best practices’ becomes a dynamic rather than a static construct.  相似文献   
23.
24.

Background

Real-world fall events objectively measured by body-worn sensors can improve the understanding of fall events in older people. However, these events are rare and hence challenging to capture. Therefore, the FARSEEING (FAll Repository for the design of Smart and sElf-adaptive Environments prolonging Independent livinG) consortium and associated partners started to build up a meta-database of real-world falls.

Results

Between January 2012 and December 2015 more than 300 real-world fall events have been recorded. This is currently the largest collection of real-world fall data recorded with inertial sensors. A signal processing and fall verification procedure has been developed and applied to the data. Since the end of 2015, 208 verified real-world fall events are available for analyses. The fall events have been recorded within several studies, with different methods, and in different populations. All sensor signals include at least accelerometer measurements and 58 % additionally include gyroscope and magnetometer measurements. The collection of data is ongoing and open to further partners contributing with fall signals. The FARSEEING consortium also aims to share the collected real-world falls data with other researchers on request.

Conclusions

The FARSEEING meta-database will help to improve the understanding of falls and enable new approaches in fall risk assessment, fall prevention, and fall detection in both aging and disease.
  相似文献   
25.
Poverty and time     
We examine the measurement of individual poverty in an intertemporal context. Our aim is to capture the importance of persistence in a state of poverty and we characterize a corresponding individual intertemporal poverty measure. Our first axiom requires that intertemporal poverty is identical to static poverty in the degenerate single-period case. The remaining two properties express decomposability requirements within poverty spells and across spells in order to reflect the persistence issue. In addition, we axiomatize an aggregation procedure to obtain an intertemporal poverty measure for societies and we illustrate our new index with an application to EU countries.  相似文献   
26.
Although one can assume the work values within nonprofit organizations promote gender equality in promotion decisions, there is preliminary evidence that in the nonprofit sector women are underrepresented in higher management positions. Whereas the mechanisms resulting in underrepresentation of women in management have been studied extensively in for‐profit organizations, little is known about these mechanisms in nonprofit organizations. Is gender in nonprofit organizations—even given the underlying values of these organizations—an impediment to attaining a management position? This article presents a case study of employment patterns within the Dutch section of the humanitarian INGO Médecins Sans Frontières and focuses particularly on the effects of gender and occupation on transitions to management. The case study organization represents a “critical case” because the nature of this organization's work environment can be expected to result in a relatively high percentage of women in management. Employee records (N = 2,247) were analyzed using event history models. We found that women made the transition to management less rapidly than men, even when controlling for factors like age, previous work experience, and nationality. However, gender differences were completely explained by occupation. Those employees in female‐dominated occupations (in this case, medical personnel such as nurses) had a lower promotion‐to‐management rate than those in male‐dominated occupations (in this case, nonmedical personnel such as financial officers), irrespective of their gender. This case study highlights the importance to nonprofit management research of studying the effects of occupational sex segregation on promotion.  相似文献   
27.
Lusofonia or lusophony is often defined as an identity shared by people in areas that were once colonised by Portugal, which in Africa include Angola, Cabo Verde, Guinea-Bissau, Mozambique and São Tomé and Príncipe. Lusofonia assumes that in these places people share something – a language, certainly, but also a history and culture rooted in the Iberian Peninsula. In some ways it is a re-articulation of Gilberto Freyre’s lusotropicalismo, the idea that Portuguese were more adaptable than other Europeans to tropical climates and cultures and created more multicultural colonial communities. Those who espouse lusofonia often have a political agenda – the strengthening of the Community of Portuguese-Speaking Countries. In this article, we argue that, like lusotropicalismo, lusofonia is a dream; it is not rooted in a historical reality. It is luso-centric in that it ignores the power and persistence of local cultures and gives undue weight to Portuguese influence. With regard to Africa, lusofonia’s agenda is elite driven and assumes the inevitability of modernity and globalisation. And we demonstrate that it was through Upper Guinean institutions and languages, and not colonial ones, that community and fellowship were most commonly fostered in the past, as they are fostered today. Those seeking the roots of lusofonia cannot, then, look to this period of Portuguese–African engagement in Upper Guinea. There Portuguese embraced “black ways.” They operated in a peculiar multicultural space in which people possessed fluid and flexible identities. Portugal did not create that space. Lusofonia has not been the foundation for cultural unity. Rather, unity has been found in localised institutions and in Crioulo. In Guinea-Bissau, lusofonia is not an indigenous movement. If it is anything, it is the stuff of elites and foreigners and is not rooted in any historical reality.  相似文献   
28.
Every social science researcher must make a number of methodological decisions when planning and implementing research projects. Each such decision carries with it both advantages and limitations. The decisions faced and made by Regnerus (2012) are discussed here in the wider context of social science literature regarding same-sex parenting. Even though the apparent outcomes of Regnerus’s study were unpopular, the methodological decisions he made in the design and implementation of the New Family Structures Survey were not uncommon among social scientists, including many progressive, gay and lesbian scholars. These decisions and the research they produced deserve considerable and continued discussion, but criticisms of the underlying ethics and professionalism are misplaced because nearly every methodological decision that was made has ample precedents in research published by many other credible and distinguished scholars.  相似文献   
29.
Estimation of benchmark doses (BMDs) in quantitative risk assessment traditionally is based upon parametric dose‐response modeling. It is a well‐known concern, however, that if the chosen parametric model is uncertain and/or misspecified, inaccurate and possibly unsafe low‐dose inferences can result. We describe a nonparametric approach for estimating BMDs with quantal‐response data based on an isotonic regression method, and also study use of corresponding, nonparametric, bootstrap‐based confidence limits for the BMD. We explore the confidence limits’ small‐sample properties via a simulation study, and illustrate the calculations with an example from cancer risk assessment. It is seen that this nonparametric approach can provide a useful alternative for BMD estimation when faced with the problem of parametric model uncertainty.  相似文献   
30.
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