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   1251篇
  免费   61篇
  2023年   6篇
  2022年   7篇
  2020年   20篇
  2019年   36篇
  2018年   43篇
  2017年   59篇
  2016年   52篇
  2015年   30篇
  2014年   34篇
  2013年   448篇
  2012年   42篇
  2011年   32篇
  2010年   41篇
  2009年   37篇
  2008年   26篇
  2007年   29篇
  2006年   15篇
  2005年   16篇
  2004年   16篇
  2003年   20篇
  2002年   18篇
  2001年   18篇
  2000年   13篇
  1999年   23篇
  1998年   9篇
  1997年   13篇
  1996年   11篇
  1995年   13篇
  1994年   9篇
  1993年   8篇
  1992年   10篇
  1991年   6篇
  1990年   6篇
  1989年   7篇
  1987年   6篇
  1986年   6篇
  1985年   8篇
  1984年   9篇
  1982年   5篇
  1981年   11篇
  1980年   9篇
  1979年   14篇
  1978年   4篇
  1977年   6篇
  1976年   7篇
  1975年   6篇
  1974年   8篇
  1973年   11篇
  1972年   5篇
  1971年   4篇
排序方式: 共有1312条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
Policy Bubbles     
We develop the concept of a policy bubble to capture the notion of long‐term overinvestment in a policy. In sketching the relation of policy bubbles to economic bubbles, we describe how these two concepts have similar origins but different trajectories because they are filtered by different institutions. We examine in some detail three likely instances of ongoing policy bubbles: crime policy, school reform (charter schools and private education vouchers), and the contracting and privatization of public services. We show how these cases differ from the housing bubble of 1997–2007, how they differ from each other, and the extent to which they can be considered policy bubbles. Last, we suggest this concept can help unify the policy process literature with the practice of policy evaluation and outline testable hypotheses for future research.  相似文献   
86.
Studies of political attention often focus on attention to a single issue, such as front‐page coverage of the economy. However, examining attention to a single issue without accounting for the agenda as a whole can lead to faulty assumptions. One solution is to consider the diversity of attention; that is, how narrowly or widely attention is distributed across items (e.g., issues on an agenda or, at a lower level, frames in an issue debate). Attention diversity is an important variable in its own right, offering insight into how agendas vary in their accessibility to policy problems and perspectives. Yet despite the importance of attention diversity, we lack a standard for how best to measure it. This paper focuses on the four most commonly used measures: the inverse Herfindahl Index, Shannon's H, and their normalized versions. We discuss the purposes of these measures and compare them through simulations and using three real‐world datasets. We conclude that both Shannon's H and its normalized form are better measures, minimizing the danger of spurious findings that could result from the less sensitive Herfindahl measures. The choice between the Shannon's H measures should be made based on whether variance in the total number of possible items (e.g., issues) is meaningful.  相似文献   
87.
88.
Abstrakt Immobilienwirtschaft als Partner der Stadtentwicklung? Zugegeben eine Sichtweise, die oftmals in der Ausbildung von Planern oder Geographen etwas zu kurz kommt. Dabei w?re es oft sinnvoll, bei der Planung auch die Sicht der Immobilienwirtschaft respektive der künftigen Nutzer zu berücksichtigen. Seit jeher haben sich St?dte auch und vor allem durch die Baut?tigkeit von Privaten entwickelt. Investitionen der Kommunen und des Staates beschr?nkten sich in der Regel auf technische und soziale Infrastruktureinrichtungen und das eine oder andere Renommierobjekt, wie beispielsweise Museen, Theater, Opern. In Zeiten knapper ?ffentlicher Kassen werden selbst dafür zunehmend private Investitionen ben?tigt. In dem sich aktuell versch?rfenden Wettbewerb der St?dte und Regionen sind Investoren, die zur baulichen und wirtschaftlichen Entwicklung beitragen, wichtiger denn je. Wie sich das Zusammenspiel von Immobilienwirtschaft und Wirtschaftsf?rderung in der Praxis darstellt, schildern die Autoren beispielhaft anhand ihrer Erfahrungen aus der kommunalen Wirtschaftsf?rderung.  相似文献   
89.
Knowledge intensive business services (KIBS) are believed to be one of the main drivers of technological change, innovation, and economic progress. Although firm foundations play a crucial role among KIBS, entrepreneurship research has hardly ever investigated the sector. As firm founders in early stages of their firms' development mostly draw on regional resources, and as the provision of the services is an interactive process, “proximity” between the different actors of the particular territorial innovation and production system clearly matters. This contribution analyses the interrelationships between KIBS foundations and their respective innovation and production systems by performing qualitative and conceptual in-depth studies of three German metropolitan regions.  相似文献   
90.
This article considers suburban development in Australia through the lens of its second largest city, Melbourne. Contemporary urban policies have focussed on the low densities within Australia's capitals and tried to achieve sustainability through urban consolidation policies. The article argues that these policies are often based on a distorted understanding of the relationship between housing markets and labour markets in Australia's large metropolises. The analysis of suburban development in Melbourne shows that suburban development involves complex links between changes in housing and job location and that urban sustainability policy needs to include actions designed to change the distribution of employment as well as the location and density of housing. The article shows that the vast spread of the Melbourne population masks closely linked regional labour and housing markets.  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