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   441篇
  免费   25篇
各国政治   31篇
工人农民   25篇
世界政治   27篇
外交国际关系   17篇
法律   197篇
中国政治   2篇
政治理论   167篇
  2021年   5篇
  2020年   9篇
  2019年   10篇
  2018年   8篇
  2017年   15篇
  2016年   13篇
  2015年   12篇
  2014年   15篇
  2013年   87篇
  2012年   17篇
  2011年   11篇
  2010年   15篇
  2009年   15篇
  2008年   12篇
  2007年   16篇
  2006年   14篇
  2005年   11篇
  2004年   13篇
  2003年   10篇
  2002年   15篇
  2001年   11篇
  2000年   4篇
  1999年   12篇
  1998年   5篇
  1997年   4篇
  1996年   7篇
  1995年   6篇
  1994年   7篇
  1993年   5篇
  1992年   7篇
  1991年   10篇
  1990年   6篇
  1989年   7篇
  1988年   5篇
  1987年   2篇
  1986年   3篇
  1985年   2篇
  1984年   3篇
  1983年   4篇
  1982年   4篇
  1981年   7篇
  1979年   3篇
  1977年   4篇
  1976年   1篇
  1974年   3篇
  1973年   1篇
  1971年   1篇
  1969年   1篇
  1968年   1篇
  1967年   4篇
排序方式: 共有466条查询结果,搜索用时 31 毫秒
351.
352.
Following an intentional or accidental bio-warfare agent (BWA) release, environmental sample analysis is absolutely critical to determine the extent of contamination. When dealing with nonspore forming BWA (e.g., Yersinia pestis), retention of cell viability is central to such analyses. Even though significant advances have been achieved in DNA sequencing technologies, a positive identification of BWAs in environmental samples must be made through the ability of cells to form colony-forming units upon culturing. Inability to revive the cells between collection and analysis renders such studies inconclusive. Commercial kits designed to preserve the viability of pathogens contained within clinical samples are available, but many of them have not been examined for their ability to preserve samples containing suspected BWAs. The study was initiated to examine the applicability of commercial solutions aiding in retention of Y. pestis viability in samples stored under nonpermissive temperatures, that is, 40 and 37°C. While none of the tested solutions sustained cell viability at 40°C, the results show five out of 17 tested preservatives were capable of supporting viability of Y. pestis at 37°C.  相似文献   
353.
Can a school or district improve student achievement simply by switching to a higher-quality textbook or curriculum? We conducted the first multi-textbook, multi-state effort to estimate textbook efficacy following widespread adoption of the Common Core State Standards (CCSS) and associated changes in the textbook market. Pooling textbook adoption and student test score data across six geographically and demographically diverse U.S. states, we found little evidence of differences in average achievement gains for schools using different math textbooks. We found some evidence of greater variation in achievement gains among schools using pre-CCSS editions, which may have been more varied in their content than post-CCSS editions because they were written for a broader set of standards. We also found greater variation among schools that had more exposure to a given text. However, these differences were small. Despite considerable interest and attention to textbooks as a low-cost, “silver bullet” intervention for improving student outcomes, we conclude that the adoption of a new textbook or set of curriculum materials, on its own, is unlikely to achieve this goal.  相似文献   
354.
Family‐owned businesses (FOBs) are as unique as the families that own and control them. As reported by Miller, Steier, and Le Breton‐Miller (2003, p.513), the founders of many of these businesses try to continue their legacy and ensure continued family control via intergenerational succession, as when they hand over leadership to their children. The initial statistics suggest only approximately one third of FOBs survive into the second generation, with just 12% remaining “viable” by the third, and only about 3% operating into the fourth generation or beyond. Thus, one of the central problems for FOBs is this inability to ensure competent cross‐generational family leadership through successful transfer of ownership and management to the next family generation. This is a core issue for the modern public affairs practitioner and policy maker, nationally and internationally, and the Turkish case is a good example of the multicomplex issues evident in succession planning and leadership for business founders and leaders in these organisations. A firm's strategic orientation is an indicator of the processes developed to integrate new information, to coordinate decisions, to examine the evolution of environmental factors, and to assess new projects (Escriba‐Esteve, Sanchez‐Peinado & Sanchez‐Peinado, 2009). However, few studies have provided a framework that jointly analyses the FOB owner characteristics, the mediating processes and attitudes by which owners shape the direction of their family firms, and the effect of these postures on firm performance. This paper addresses the influence of family business owner, over the behaviour of FOBs. By treating FOB owners' characteristics as predictors of a firm's strategic orientation, we seek to provide a deeper understanding of how the characteristics of FOB owners shape decision making process and FOBs' behaviours in order to successfully survive in generations. This study introduced the concept of FOB's entrepreneurship orientation (EO) as a variable that mediates between FOB owners' characteristics and business performance. The objective of this paper is twofold: (a) to identify the demographic predictors FOBs' EO and (b) to analyse the role of EO as a mediator of the relationship between FOB owners' characteristics and FOBs' performance.  相似文献   
355.
Managing work while pregnant has long been a challenge for women in both paid and unpaid work. With Norway as the case in point, the aim of this study was to explore expectations and experiences among women relating to work-life and pregnancy health. Employing the constant comparison method, we drew on interviews, Internet discussions, newspapers, and health information booklets. The findings revealed strong discourses on pregnancy as health, and high expectations among pregnant women to be healthy, fit, and maintain their working capacity throughout pregnancy. Women who needed to slow down failed to fulfil these normative expectations and commonly experienced this as a personal defeat. Despite policies and regulations protecting women's pregnancy-related needs vis-à-vis their employer, some women hesitated to claim their eligibility to special rights. Many pregnant women overstretched, compromising their own health. This, we argue, reflects the ambiguity in policy and in the public debate. Ideas about pregnant women as a vulnerable group needing special protection on the one hand, and the expectations to perform as usual throughout pregnancy on the other, are discussed here in view of a gender-difference versus a gender-neutral discourse, the latter being foundational to the public debate on gender in contemporary Norway.  相似文献   
356.
Offense specialization and versatility have been investigated in general offender populations, but have only recently been examined in sexual offenders. This study explored the extent of both tendencies in the criminal histories of 572 adult male sexual offenders referred for civil commitment. The specialization threshold and the diversity index were used to compare offender subgroups by referral status (committed versus observed) and offense type (rape, child molestation, and incest). Offense versatility was the more likely tendency across the sample. Committed and observed offenders did not differ. Although predominantly versatile, child molesters were significantly more likely than rapists to specialize in sexual offenses, and were also more likely to specialize in child molestation (compared to rapists specializing in rape). These results confirm previous findings on criminal versatility among sexual offenders. This adds to a growing body of research that questions universal and selective crime control policies designed exclusively for sexual offenders.  相似文献   
357.
358.
359.
360.
Beyond the initial euphoria of the National Disability Insurance Scheme (NDIS), tough choices will be needed for sustainability. Although the spirit of the NDIS is to deliver choice and control, the Australian government's objective is to ensure that rights and aspirations are proportionate to expectations of best practice, aptness of mainstream services and cost effectiveness. The position in this paper is that this test of ‘reasonable and necessary’ when determining funded supports, raises value dilemmas for government and citizens. The objective is to demonstrate this through a critical scrutiny of the reviews and decisions regarding reasonable and necessary funded supports of the Administrative Appeals Tribunal (AAT). In this paper, a synthesis and critique of 35 appeals to the AAT and one Federal Court Appeal are used to make explicit the decisional ambiguities and contestations in the scheme and the values and priorities that are currently dominant in the allocation of reasonable and necessary support. This in turn is used as a basis for a discussion about the operation of rights in the scheme and what counts as legitimate support. The benefit is for scheme transparency and fairness but also broader debate about core principles and values to inform decisions about scarce resources in society.  相似文献   
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