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   312篇
  免费   20篇
  2024年   3篇
  2023年   3篇
  2022年   1篇
  2021年   3篇
  2020年   7篇
  2019年   18篇
  2018年   31篇
  2017年   21篇
  2016年   28篇
  2015年   13篇
  2014年   15篇
  2013年   70篇
  2012年   18篇
  2011年   12篇
  2010年   17篇
  2009年   13篇
  2008年   10篇
  2007年   11篇
  2006年   4篇
  2005年   1篇
  2004年   3篇
  2003年   4篇
  2002年   1篇
  2001年   1篇
  2000年   2篇
  1999年   4篇
  1998年   3篇
  1997年   2篇
  1996年   2篇
  1993年   2篇
  1991年   1篇
  1990年   2篇
  1988年   1篇
  1987年   1篇
  1980年   1篇
  1978年   1篇
  1975年   2篇
排序方式: 共有332条查询结果,搜索用时 31 毫秒
1.
2.
The Narrative Policy Framework (NPF) suggests that narratives can be employed to define and contest policy problems. Yet, few NPF studies have explicitly addressed the narrative portrayal of problem intractability. What role do narratives play in a situation of uncertainty about the causes and solutions of the problem, when strong divergences regarding the values and interests of the policy actors exist? The article anchors the NPF to the literatures on problem definition and implementation to advance two propositions about (a) how differences in the use of narrative elements can be suggestive of the degree of problem (in-)tractability; and (b) whether other elements of tractability, namely the presence of a valid causal theory, are associated with the usage of narrative strategies. I test the propositions by analyzing media commentaries surrounding the implementation of European decisions to tackle a tree-killing epidemic in Italy. The findings suggest that narratives can helpfully illustrate the intractability inherent in the policy debate. However, narratives can also develop independently of factors that the implementation literature understands as conducive to lowering intractability, namely knowledge accumulation. The NPF may represent a promising alternative to understand policy implementation processes.  相似文献   
3.
4.
5.
The objective of this research is to examine in depth the brokerage roles that supporting institutions play in conducting local business and applying technical knowledge inside clusters. We identify three main roles: a coordination role, characterized by the efforts that organizations play in internally coordinating themselves and establishing a shared institutional framework; an interconnector role, where organizations foster communication along the value chain of the industry; and a gatekeeper role that allows organizations to connect cluster members with external networks. Results obtained in the Toy Valley cluster provide evidence that each kind of supporting organization tends to specialize in specific roles, since universities are best for a coordination role with regard to technical knowledge while private organizations are key for vertical communication and coordination. Similar results were obtained when analysing the extra-cluster contacts that these organizations develop as gatekeepers, as they tend to establish specific communication conduits with similar alters in external networks.  相似文献   
6.
This paper studies the territorial effects of the LEADER approach in Southern Europe, by analysing the region of Andalusia (Spain). Our research has revealed that, in many cases, projects were concentrated in the most dynamic, most populated areas, with a well-established business network with the financial and organizational capacity required to access European funding. In these areas, the economic leadership of the most dynamic municipalities has been reinforced at the expense of more depressed areas with little social capital and few businesses. These programmes have not, therefore, helped to mitigate territorial imbalances. In a minority of rural areas, however, this trend was not observed, which shows that although territorial inequality is a widespread problem in the practice of neo-endogenous rural development, it does not affect all areas to the same degree.  相似文献   
7.
8.
Most quantitative approaches to distributional analysis in archaeology assume a homogeneous study surface that is amenable to easy generalisations. This framework has been widely used to describe settlement processes, disregarding the spatial heterogeneity inherent to geographic reality. In other words, researchers have often assumed that the correlation between the elements of a spatial distribution is a function of the Euclidean distance (i.e. straight line distance) between them. Other archaeological studies have tested alternative measures to Euclidean distances, such as cost-based ones, both to describe optimal routes and to assess spatial autocorrelation in a point pattern. Nevertheless, until now there has been no suitable model to introduce these measures into spatial statistical equations. In order to overcome this obstacle, we approach the implementation problem inversely by embedding the spatial pattern under study into a Euclidean frame of reference based on its cost-distance pairwise matrix. This paper describes the application of this methodology on one of the main tools used by archaeologists to assess settlement patterns: Ripley’s K function. We present two case studies, covering both macroscale and mesoscale, with significant variations in the results depending on the use of the Euclidean or cost-based approach. Data, functions and results have been R-packaged for the sake of reproducibility and reusability, allowing other researchers to build upon our methods.  相似文献   
9.
The area of La Caleta, north‐west of Cadiz, is a key location for studies of the relationship between the Phoenician city of Gadir and the ocean. The port channel and the small islets that characterize the area was one the busiest sectors of the city, and there are abundant underwater remains attesting to past commercial activities. The area also had an important religious role: two sanctuaries were located at the western end of the rocky promontories that surround the channel, and many items identified as offerings have been found. This article synthesizes previous research and provides an overview of the results of a recent project (2008–2010), which enables a thorough review of the development of the seascape and its use during the 1st millennium BC.  相似文献   
10.
The full release and circulation of excavation results often takes decades, thus slowing down progress in archaeology to a degree not in keeping with other scientific fields. The nonconformity of released data for digital processing also requires vast and costly data input and adaptation. Archaeology should face the cognitive challenges posed by digital environments, changing in scope and rhythm. We advocate the adoption of a synergy between recording techniques, field analytics, and a collaborative approach to create a new epistemological perspective, one in which research questions are constantly redefined through real-time, collaborative analysis of data as they are collected and/or searched for in an excavation. Since new questions are defined in science discourse after previous results have been disseminated and discussed within the scientific community, sharing evidence in remote with colleagues, both in the process of field collection and subsequent study, will be a key innovative feature, allowing a complex and real-time distant interaction with the scholarly community and leading to more rapid improvements in research agendas and queries.  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