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   62篇
  免费   8篇
  2024年   1篇
  2023年   1篇
  2022年   1篇
  2020年   2篇
  2019年   7篇
  2018年   9篇
  2017年   12篇
  2016年   6篇
  2015年   1篇
  2014年   4篇
  2013年   11篇
  2012年   1篇
  2011年   4篇
  2009年   2篇
  2008年   3篇
  2007年   1篇
  2006年   2篇
  2005年   1篇
  2000年   1篇
排序方式: 共有70条查询结果,搜索用时 78 毫秒
61.
A method to assess the coherence of defensive systems based on the individual and combined visual coverage of fortifications is presented. The case study is the complex fortification system of Lines of Torres Vedras, around Lisbon, Portugal, activated in the first decade of the 19th century to halt the French armies of Napoleon in the Peninsular War. As messages between fortifications are known to have been exchanged visually by semaphore, GIS-based viewshed calculations enabled the assessment of the system's coherence and the exploration of how the undocumented communication with the defensive forces' headquarters in Lisbon might have been achieved. Results show that the defensive system with its two lines was highly effective per se with respect to the visual coverage of the terrain and the exchange of messages between fortifications, but it could have been improved with minor changes to the location of communication devices. It is also found that communication with the headquarters in Lisbon was not adequate, suggesting that additional devices were needed.  相似文献   
62.
Do local policymakers strategically use delay in permitting development to forestall the growth machine? The mantras of smart growth and sustainable development assume local governments can balance the competing values of economic development, ecology, and equity interests in a community. We employ a political market framework to explain differences in local government land use decisions. This framework conceptualizes policy choices as resulting from the interplay between the aggregate policy demand by residents, developers, and environmental interests and the aggregate supply by government authorities. Delays can be imposed strategically through processes of development approval by city governments where industry strength and form of government vary within county‐level service‐delivery fragmentation. We utilize novel Bayesian multilevel modelling of data collected from 2007 and 2015 surveys of Florida city planners and find strong institutional effects and multilevel relationships.  相似文献   
63.
This paper provides a contribution to FTIR analysis of calcium sulphate‐based grounds of paintings when a mixture of compounds with different degrees of hydration is present. The study is based on the analysis with that technique, electron microscopy coupled with energy‐dispersive X‐ray spectrometry and X‐ray diffraction of both the grounds of 16th‐century Portuguese paintings and reference samples prepared with anhydrite and calcium sulphate dihydrate bound in an animal glue solution. It is shown that the interpretation of the degree of hydration of calcium sulphate ground samples using FTIR cannot be based solely on the study of the hydroxyl bands, as is usual in routine work, but that small deviations of the S–O vibration bands are an important indicator of the presence of anhydrite in the grounds.  相似文献   
64.
This paper aims to discuss institutional capacity building in spatial planning focussing on two experiences of public policy in Portugal involving institutional cooperation. These experiences reveal the importance of factors associated with the roles of the central state and local political leadership in the way integrated tools of urban and territorial policy are implemented. They also show that the capacity to mobilize local agents is mitigated by the deep-rooted presence of highly personalized institutional ties, reflecting a relational model that is particularly characteristic of Portuguese society. We will conclude that territorial policies may be jeopardized when these policies are centred mainly upon the mobilization of local agents. In fact, these two case-studies, as well as similar experiences in Italy, suggest that, in southern Europe, two other aspects are central for the definition of territorial policies on the inter-municipal and local scales: the influence of the state, and the role of political leadership at local level.  相似文献   
65.
66.
67.
ABSTRACT

We examine the impact of political parties on the success of women and men candidates in the 2005 municipal elections of Québec’s two most populous regions, Montérégie and Montréal. We built the dataset by requesting documentation from each municipality separately. This original dataset supports our two hypotheses. First, we demonstrate that the presence of political parties did not affect the difference in percentages of votes obtained by women and men candidates. No matter the gender, candidates affiliated with a political party obtained more votes than independent ones. Second, we find that gender did not affect contributions. No matter the gender, the presence of political parties and the candidates’ affiliation had a positive impact on their contributions. Québec conforms to findings in the U.S. literature: women and men candidates, under similar circumstances, are equally likely to obtain votes and contributions.  相似文献   
68.
69.
70.
Journal of Archaeological Method and Theory - We review palaeoenvironmental proxies and combinations of these relevant for understanding hunter-gatherer niche construction activities in...  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