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   3篇
  免费   0篇
  2013年   1篇
  2011年   1篇
  1993年   1篇
排序方式: 共有3条查询结果,搜索用时 8 毫秒
1
1.
The article discusses the present state of knowledge of the basic components of the heat balance of the earth's surface (radiation balance, loss of heat to evaporation, turbulent heat exchange) and the distribution of these components in time and space. Soviet research is concerned with applying heat-balance data to the study of physical-geographical processes (hydrologic regime, plant and soil cover), to the study of integrated geographic problems (geographic zonality) and practical problems (weather and hydrologic forecasting, the use of solar energy for productive purposes, and the use of heat-balance data for planning reclamation projects and other nature-transforming measures.)  相似文献   
2.
In order to constrain the age of the Upper Cretaceous continental Densuş-Ciula Formation from the Haţeg basin, South Carpathians, and correlate it with the other continental unit that occurs in the region, the Sanpetru Formation, we separated and dated by the K-Ar method biotites and amphiboles from volcanoclastic deposits. The mineral phases analysed are from two tuff layers and volcanic bombs cropping out near Rachitova village. Two tuff layers from the Densuş-Ciula Formation give early Maastrichtian ages of 69.8±1.3 and 71.3±1.6 Ma, respectively. The ages determined for the tuff layers constrain the age of deposition for the Densuş-Ciula Formation and enable further correlations with the available palaeomagnetic data from the deposits occurring along the Sibişel Valley that belong to the Sanpetru Formation. The volcanic bombs collected near to Răchitova village are andesites and dacites. The age determined by K-Ar method on hornblende separated from a volcanic bomb is 82.7±1.5 Ma, which is older than the underlying Campanian marine deposits in turbidite facies. This suggests that the volcanic bombs were re-deposited during the early Maastrichtian. Thus, the volcanics found at Răchitova have at least two origins: one type is related to an explosive synsedimentary volcanic activity, and the other type is represented by older andesitic/dacitic bombs, which most probably originate from a volcanic centre situated in the Haţeg region.  相似文献   
3.
Poland has a relatively higher proportion of households as compared to number of housing units available. The distortions in housing stock have increased in Poland since the 1960s and 1970s as deficits remained very high and the demand increased in Poland while other socialist nations of eastern Europe reduced their housing deficits. Housing is important irrespective of the economic system of the country, whether socialist or non‐socialist In a socialist economy, housing is heavily subsidized to meet the minimal requirements of all the people. Though the expressed policy of the socialist country is to minimize the differences between the rural and urban areas there are still basic socio‐economic differences in existence between the rural and urban housing stock. This study found that there were distinct differences between the different macro‐regions: the buildings varied in their age, condition, uses and composition. In Warsaw or Central Poland, roofs are constructed of tar boards and the buildings are used for subsidiary uses. In the eastern and southern regions of Poland, it was found that the majority of buildings are used as single‐family buildings. Many of the dwellings in the south are single family, with roofs constructed of tin plate and sheet metal. The walls of the buildings in this area were constructed of logs and boards. Endemic to the north‐western portion of Poland are roofs constructed of tile. Many of the characteristics found within the regions of Poland stem from the cultural influences.  相似文献   
1
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