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The name "petroleum" signifies "oil from stone."According to the classification ofMale,petroleum is included in the category of bitumens.It is an extremely complextype of mineral oil, compounded of various substances and valuable for its combustiblequalities.It is found in the earth, sometimes lying at great distances below the surface.  相似文献   

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The name "petroleum" signifies "oil from stone."According to the classification ofMale,petroleum is included in the category of bitumens.It is an extremely complextype of mineral oil, compounded of various substances and valuable for its combustiblequalities.It is found in the earth, sometimes lying at great distances below the surface.  相似文献   

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President:Lu Dadao (Academician of CAS)Vice Presidents: Bao Jigang, Cai Yunlong, Cheng Guodong, Fu Bojie, Gu Chaolin, Li Xiubin, Shi Peijun, Song Changqing, Xu ShiyuanSecretary-General:Zhang GuoyouAddress: 11A, Datun Road, Beijing 100101, ChinaE-mail: gsc@igsnrr.ac.cn Website: www.gsc.org.cnHistory:The Geographical Society of China is one of the earliest established academic societies in China. Her predecessor is the Geoscience Society of China…  相似文献   

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The major factors which control the climate of China are three in number:(1) distribution of land and water, (2)mountain barriers aad altitudes, andcyclonic storms  相似文献   

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In Norway, as in most other countries, official shipping statistics are scarce and give little information beyond the number and tonnage of vessels arrived from and departed to foreign countries (1). These statistics give no figures for the amount of cargo carried, and no information as to the type of vessels, only their nationality.

To get the "freight balance" for Norway, i. e. the balance between seaborne cargo (by weight) to and from foreign countries, we may use the trade statistic figures and corrigate for the railway-traffic. The West-European countries, importing bulky raw materials and exporting manufactures, have usually uneven freight balances, with an excess of inward bound cargo. The freight balance for Norway is also uneven, but here the outgoing cargo exceeds the ingoing, due to the transit of Swedish iron ore through the port of Narvik. In 1951 the outgoing cargo amounted to about 14 million tons (including 8 mill, tons Swedish ore), and the ingoing cargo to 7% mill. tons.  相似文献   

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President:Zheng Du (Academician of CAS)Secretary-General:Dr. Zhu LipingAddress: 11A, Datun Road, Beijing 100101, ChinaE-mail: zhulp@igsnrr.ac.cn Website:www.cstp.org.cnThe China Society on Tibet Plateau (CSTP), led by the China Association of Science and Technology (CAST), is a national, scholarly and non-profit making organization consisting of scientists and technologists engaged in the research and construction of Qinghai-Tibet Plateau. It is a key social power for promo…  相似文献   

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The environment evolution of Wuliangsuhai wetland   总被引:1,自引:0,他引:1  
1IntroductionWith the improvement of people's living standard and economic development, the demands for high quality water resources have been growing, meanwhile, water pollution has become increasingly. According to the survey, most of the rivers, lakes and reservoirs are threatened by the pollution and eutrophication. To solve the problems, and to control the deterioration of water environment of lakes of Dongting, Boyang, Qinghai, and to find the best reclamation measures, experts on lake…  相似文献   

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Radical geography has posed new, and refashioned many old, geographical problems. These problems require attention irrespective of one's political leanings. Yet radical geography has been consistently ignored by mainstream geographers since its inception. This essay examines the reasons for this situation, and finds four answers in Peet's recent review of the history of radical geography [1]. It seems likely that radical geography will continue to receive a cold shoulder unless its future exponents take pains to counter this trend. Six conditions are required to ensure progress, including effective communication in established journals, methodological heterodoxy, and a systematic, discipline-wide evaluation of the contribution of radical geography.  相似文献   

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Geographical data sets sometimes contain missing observations that need to be estimated. A statistical approach to the problem is discussed for multivariate normal spatial data sets satisfying the first-order spatial Markov property with constant mean, where the information at neighboring or contiguous observed sites is used to estimate the missing values. The completed data are used to estimate the parameters of the distribution. The procedure is iterative. The approach is a special case of the Orchard and Woodbury missing information principle. The paper concludes with an illustrative empirical example using rainfall data from an area of Kansas and Nebraska. The quality of the estimates for different sites are compared.  相似文献   

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Past research has characterized countries as displaying the traits of urban or rural bias. Neither concept fits the United States well. We propose, as a hypothesis for research, that it may better be understood as displaying a suburban bias vis-à-vis both urban and rural populations. Drawing on the urban and rural bias literatures, we discuss two forms that suburban bias might take, allocational and dispositional, and the ways in which they might be identified. We offer initial evidence of a prevailing suburban bias in the United States in two spheres, those of judicial interpretation and American planning history, and conclude with suggestions for further research on the hypothesis.  相似文献   

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This research paper concentrates on creating easy and stress-free classroom in English teaching.The paper talks that teachers should adopt pupil-centered teaching methodology and employ every means of teaching such as listening and speaking;acting;singing songs;playing games;role-playing.  相似文献   

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Institute of Geographic Sciences and Natural Resources Research (IGSNRR): www.igsnrr.ac.cnThe Geographical Society of China (GSC): www.gsc.org.cnChina Society of Natural Resources (CSNR): www.csnr.orgChina Society on the Tibetan Plateau (CSTP): www.cstp.org.cnInstitute of Remote Sensing Applications (IRSA): www.irsa.ac.cnNanjing Institute of Geography and Limnology (NIGL): www.niglas.ac.cnState Key Laboratory of Resources and Environmental Information …  相似文献   

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