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环嵩山地区9000 aB.P.-3000 aB.P.聚落规模等级 总被引：2，自引：1，他引：1
选取遗址面积、文化层厚度、重要遗物、重要遗迹4 个变量, 利用SOFM网络对环嵩山地区9000 aB.P.-3000 aB.P.聚落按照裴李岗、仰韶、龙山、夏商4 个阶段分别进行聚类分析, 以此对区域不同时期早期聚落的规模等级进行划分, 其中裴李岗时期聚落划分为2 个级别, 仰韶、龙山时期聚落均划分为3 个级别, 夏商时期聚落划分为4 个级别。结果表明, 裴李岗时期区域聚落等级规模之间的差异不明显, 大致在距今5000 年左右的仰韶文化中晚期, 区域聚落规模等级出现分异, 这种分异在龙山时期得以延续, 并于夏商时期最终形成。此外, 规模等级划分结果还对于特定时期文化面貌的区域差异有所反映, 具体表现在裴李岗时期3 个区域所属的不同文化系统与夏、商文化不同的空间分布特征。通过环嵩山地区9000 aB.P.-3000 aB.P.聚落规模等级研究发现, SOFM网络具有的邻近单元相互竞争、相互学习特征可以降低遗址面积不准确性对于分类结果的影响, 非常适合于早期聚落规模等级的划分。 相似文献
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PAUL MATHER 《International journal of geographical information science》2013,27(2):258-259
As they increase in popularity, social media are regarded as important sources of information on geographical phenomena. Studies have also shown that people rely on social media to communicate during disasters and emergency situation, and that the exchanged messages can be used to get an insight into the situation. Spatial data mining techniques are one way to extract relevant information from social media. In this article, our aim is to contribute to this field by investigating how graph clustering can be applied to support the detection of geo-located communities in Twitter in disaster situations. For this purpose, we have enhanced the fast-greedy optimization of modularity (FGM) clustering algorithm with semantic similarity so that it can deal with the complex social graphs extracted from Twitter. Then, we have coupled the enhanced FGM with the varied density-based spatial clustering of applications with noise spatial clustering algorithm to obtain spatial clusters at different temporal snapshots. The method was experimented with a case study on typhoon Haiyan in the Philippines, and Twitter’s different interaction modes were compared to create the graph of users and to detect communities. The experiments show that communities that are relevant to identify areas where disaster-related incidents were reported can be extracted, and that the enhanced algorithm outperforms the generic one in this task. 相似文献
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善于追踪地理学最新信息的人总是经常见到一个赫然的名字A.G.Wilson。A.G.Wilson以其在现代地理学中的巨大成就引起了愈来愈多的地理学工作者的关注。一、A.G.Wilson是一个数学地理学家A.G.Wilson早年就读于剑桥大学数学专业,而后任职于英国中心科学研究所,同时受聘于牛津大学的经济学院和统计学院,并出任英国输运大臣的数学顾问和环境研究中心副主任,现任英国里兹大学区域地理和城市地理教授。其主要著作有《城市区域模型的熵》、《地理规划中的城市区域模型》、《城市区域模型:理论和经验进展》、《地理和规划的数 相似文献
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In this paper, we explore migration aspects of the 1995 Quebec Sovereignty Referendum with data from a survey administered to non-francophones in Montreal two weeks prior to the Referendum. While the Quebec sovereignty issue has been around for some time and earlier exodus from the province, particularly among anglophones, is largely regarded as “forced” in some way, this study neither confirms the 1995 Sovereignty Referendum as a paramount factor in explaining outmigration from Quebec nor points to a real reluctance to leave Montreal. The decision to move is influenced by the interplay of a multitude of factors. The political influence is only an added factor to longstanding economic decline and cultural clash. Moreover, if there is any impulsion, the degree varies among different cultural and socioeconomic groups. 相似文献
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Dr. D. B. Prior R. M. Eve 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(1):12-17
Prior, D. D. &; Eve, R. M. 1975: Coastal landslide morphology at Røsnæs, Denmark. Geografisk Tidsskrift 74: 12–20. København, Juni, 1, 1975. Based on the field studies the coastal landslide morphology and the moss movement types in the Røsnæs area are described and classified, followed by a general discussion of the factors which promote slope instability. 相似文献
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李文彦 《地理学报(英文版)》1954,(2)
尼古拉·尼古拉也维奇·巴朗斯基是当代最伟大的一位经济地理学家,苏联地理学界的一面旗帜。我国的地理工作者都很熟悉他,从他的著作中可以吸取苏联丰富的先近科学经验以推动我国地理科学的发展。 相似文献
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In the present era of accelerated technological development with its proliferation of new digital media,PC and Internet,the main questions concerning communication practices examine the patterns of interaction between these practices and the use of‘old’media,such as print,the electronic and audiovisual media,television,radio and VCR,which have all dominated the communication scene until fairly recently.Definitely we can say that the internet has become a family member that no one can live without it,especially the new types electronic products’sale in the markets and the development of the wireless(wifi),what’s more,the high click rates of facebook,youtube,twitter and so on.This great change also have happened in China that you can see the first thing for everyone in the morning is connecting the internet so as to read weibo(micro blog,its function is similar to twitter,now it is the most popular and famous micro blog in China),youku(similar to ytube),xiaonei(like facebook)and so on.Therefore a great many‘old’media in China is now experiencing the large reform.CRI(China Radio International)cannot lag behind.In this paper,I am trying to introduce one website from CRI which is called“hebrew.cri.cn”as a landscape to state her“birth”,“grow up(development)”and her“future”. 相似文献
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尼古拉·尼古拉也维奇·巴朗斯基是当代最伟大的一位经济地理学家,苏联地理学界的一面旗帜。我国的地理工作者都很熟悉他,从他的著作中可以吸取苏联丰富的先近科学经验以推动我国地理科学的发展。 相似文献
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文献所给计算蒸发力E_0的М·И·Будыко公式为:E_0=ρD(q_s-q'_a),(1)其中,ρ为空气密度,D为外扩散系数,q_s为与蒸发面温度T_s相应的饱和比湿,q'_a为空气的实际比湿.由方程R_0-Q=L_ρD(q_s-q'_a)+(4δσT_a~3+ρC_pD)(T_s-T_a)(2)解得.其中,R_0表示据气温算出有效辐射时所得的蒸发面湿润状况下的辐射平衡值,Q表示蒸发面与其下层土壤间的热交换量,δ是灰体辐射系数,σ是史蒂芬-波尔兹曼常数, 相似文献