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   14篇
  免费   3篇
  2018年   1篇
  2017年   1篇
  2016年   1篇
  2015年   2篇
  2013年   4篇
  2009年   1篇
  2008年   2篇
  2007年   1篇
  2005年   2篇
  2003年   1篇
  2002年   1篇
排序方式: 共有17条查询结果,搜索用时 31 毫秒
11.
12.
An assemblage of hermatypic scleractinian corals occurring landwards of the Pleistocene sandy Inner Barrier system has been referred to the last interglacial period. It comprises at least 20 species, many of which are in growth position, and is accompanied by a substantial association of molluscans. The richness of the assemblage is indicative of good access of oceanic waters at the time of its formation, so the deposit predates barrier emplacement. The coral occurrences are compared with present-day southern ranges of the scleractinian species (all extant), and the implications for climatic and sea-level conditions in the last interglacial are discussed. A sea-level stand of 4–6 m above that at present obtaining (in accord with Marshall & Thom, 1976) and a climatic shift towards a cooler regime equivalent to a minimum of 2° of latitude are concluded.  相似文献   
13.
This article presents information derived from unfunded fieldwork undertaken between 2008 and 2014 in Goa, India. Traditional boat structure is understood in the context of the use of local materials in response to climatic, geophysical, and cultural factors. Expanded and unexpanded logboats are shown to affect differently the pirogues based on them. The outrigger is not used as a sailing aid. Small sailed boats with sewn strakes on a keel‐plank are compared with 19th‐century records. Simple techniques are used on larger sewn and metal‐fastened vessels still being built. Today some factors combine to compromise traditional construction, while others are bringing about the demise of the vessels themselves.  相似文献   
14.
祖陵是辽代第一个皇帝耶律阿保机及其皇后的陵寝之地,建于天显二年(公元927年)。祖陵位于内蒙古巴林左旗查干哈达苏木石房子嘎查两北的山谷中,东南约2.5公里处为其奉陵邑祖州城。祖陵坐落于  相似文献   
15.
Many assume that modern presidents cannot persuade cross‐ideologues to support their policy proposals. The idea that a conservative would support a liberal policy advocated by a cross‐partisan president seems ludicrous. However, recent research suggests that conservatives will support liberal policies that are framed consistent with moral foundations. Using a national survey experiment that carefully manipulates the actual text of a speech given by President Obama, this article demonstrates that fairness frames in presidential speeches motivate liberal policy support among conservative, moderate, and liberal Americans who value fairness.  相似文献   
16.
In the Schleswig–Holstein region (S–H) of Germany, most observed near-surface saline ground waters originate from dissolution of shallow salt domes. Previous numerical simulations of thermohaline flow clarified the major mechanisms controlling large-scale density-driven flow. It has been found that, in addition to topographically driven flow, gravitational and thermohaline convection are the primary mechanisms for extensive solute exchange between shallow and deep aquifers. Geological features such as glacial channels control recharge/discharge processes at the surface. Here we address several previously unresolved issues: (i) the impact of a permeable unit (transition zone) between the salt and adjacent units; (ii) the role of variable brine viscosity in affecting regional- (i.e. km-) scale heat and mass patterns; and (iii) the influence of anthropogenic activities such as pumping stations on density-driven flow. We found that geophysical factors play a major role in determining the dynamics of fluid processes. The transition zone significantly influences the flow field and the distribution of heat, slowing the formation of highly concentrated salty plumes. The impact of variable fluid viscosity on the coupled heat and brine flow is twofold. In a colder and highly concentrated environment, such as a shallow salt-dome crest, it retards brine flow. In a less saline environment, variable fluid viscosity enhances thermally induced upward fluid flow. Groundwater extraction from production wells only affects brine and heat flow locally within the upper aquifers.  相似文献   
17.
Scholars have explained the rise of non-governmental organisations (NGOs) in China since the period of reform and opening in terms of a changing political and economic environment, NGO policy, international non-governmental organisations (INGOs), and the influence of communications media and the Internet. This article proposes a new explanatory factor: the philanthropy of China’s new wealthy. Four cases are used to analyse the influences of the philanthropy of the wealthy on NGO development. The article proposes not only that the philanthropy of the wealthy provides funding and intellectual support for NGOs but also that the wealthy use their influence and social networks to increase the autonomy, capacity, sustainability and impact of NGOs in China.  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