Population development in Greater Santiago between 1970 and 1982: an analysis of district census results     

Bahr J  Mertins G 《Erdkunde》1985,39(3):218-238

"An attempt is made in the light of an analysis of population changes occurring in several sub-districts of Greater Santiago in the period between the last population censuses of 1970 and 1982, based on small-area census units (distritos and communas) to draw attention to the effects on the spatial growth of the city resulting from changed conditions in the political and juridical sphere since the change of power in 1973." The effect of changes in government policy concerning the liberalization of the property market and the illegal occupation of land are noted. (summary in ENG)  相似文献   

The Nordic geological surveys： Geology for society in practice   总被引：1，自引：0，他引：1  

Morten Smelror Andreas AhlstrФm Lena Ekelund Jens Morten Hansen Keijo Nenonen Anette K. Mortensen 《《幕》》2008,31(1):193-200

Since the mid-nineteenth century., when the first of the Nordic Geological Surveys were established, they have generated a substantial amount of information on the Earth＇s crust, its natural resources, its processes, and on the geological history of Nordic areas. The collective mission of the geological surveys is to carry out ＂Geology for Society＂, by doing research and providing services, and by making geological information and data easily accessible to all the varied end users in industry, government agencies, government institutes, public administrations, technical offices, academia and research institutes, as well as for private individuals. The present paper gives a brief overview of a few, selected, research areas and projects currently undertaken by the Nordic geological surveys. These serve as practical examples of how the Nordic geological surveys address important societal problems and challenges that require geological input for their solution.  相似文献   

Geological research at the Natural History Museum of Moscow University, 1759-1930 （in Russian）     

Zoya A. Bessudnova 《《幕》》2008,31(3):368-369

In 2006, the Moscow publishing house Nauka （Science） published a 246-page book by Zoya A. Bessudnova entitled Geological Research at the Natural History. Museum of Moscow University, 1759-1930 as No. 32 in its series ＂Sketches on the History of Geological Knowledge＇. The author is a geologist and Senior Researcher in the Department for the History of Geology of the Vernadsky State Geological Museum of the Russian Academy of Sciences, and a member of the International Commission on the History of Geological Sci- ences （INHIGEO）.  相似文献   

铁同位素的MC-ICP-MS测定方法与地质标准物质的铁同位素组成   总被引：22，自引：5，他引：17  

朱祥坤  李志红  赵新苗  唐索寒  何学贤  Nick S. Belshaw 《岩石矿物学杂志》2008,27(4):263-272

详细报道了在低分辨和高分辨模式下运用MC-ICP-MS进行Fe同位素比值高精度测试的方法,对Fe同位素测定过程中谱峰干扰、基质效应、浓度效应、仪器测试的长期重现性等问题进行了评估,并对两种运行模式的测试结果进行了对比.在95%的可信度范围内,所建方法的外部精度优于0.5ε/ainu,达到国际同类实验室的先进水平,并且低分辨和高分辨两种模式下获得的Fe同位素测试结果是一致的.在此基础上对国家地质标准物质GBW07105(玄武岩)和GBW 07111(花岗闪长岩)进行了Fe同位素测定.相对于Fe同位素国际标样IRMM-014,GBW07105的Fe同位素成分为:ε57Fe=1.9±0.3(20),ε56Fe=1.3±0.2(2σ),ε57/56Fe=0.6±0.1(2σ);GBW 07111的Fe同位素成分为:ε57Fe=1.8±0.4(2σ),ε56Fe=1.2±0.2(2σ),ε57/56Fe=0.6±0.1(2σ).  相似文献   

山东莒南地质公园发现小型兽脚类恐龙足迹化石MinisauripUS     

李日辉  ;Lockley Martin G  ;Matsukawa Masaki  ;刘明渭 《中国区域地质》2008,(1):121-125

在山东省莒南地质公园内发现6个小型恐龙足迹化石,被归入足迹属Minisauripus。化石产于下白垩统大盛群田家楼组．时代为早白垩世巴列姆（Barremian）-阿普特期（Apdan）。5个较大,长约6cm,产于下部“主”层面上,其中4个组成2节行迹：1个较小,长约3cm,位于“主”层面30cm之上的上部层面上。山东Minisauripus的特征是：足迹个体小（长3．1～5．6cm,宽2．0～3．7cm）,三趾型,略不对称;足迹纵长,各趾近平行,趾垫较清晰;趾末端较钝,但爪迹较尖。Ⅲ趾比Ⅳ趾略长,而Ⅳ趾比Ⅱ趾略长且窄。此外,步幅较长,足长与步长之比约为10：1。与四川、韩国Minisau却淞不同之处是：足迹个体较大,长约是它们的2倍。继中国四川和韩国之后,山东是Minisau而淞在全球的第三个发现点。  相似文献   

О ПРЕДГОРНЫХ ОТЛОЖЕНИЯХ ЦАЙДАМА И ОТНОВНЫХ ЧЕРТАХ ЕГО РАЗВИТИЯ В ЧЕТВЕРТИЧНОЕ ВРЕМЯ     

Э.А.Еганов 《地质学报》1960,40(2)

玖a众八aMeKa只K叮几oBHHa,oKpy水eHHa只roPHHMH eHeTeMaMH HaHb一山aH只,A几T曰H-Tara H KyHb一几yH只,no eBoeMy eTpoeHH幻只B几分eTe分THnHqH曰M nPe八eTaBHTe几eM Me米ro-PHHx Bna及HH玖eHTPa几bHo仑A3HH. O6mHPH班e reo卫orHqeeKHe Hee几e八oBaHH只B玖a益八aMe 6H几H HaqaTH ePaBHHTe卫bHoHe及aBHo一e 1955 ro八a B eB只3H e PasBe八Ko仑He中TeHoeHHx TPeTHqH曰x oT几。水eHH众BHn邸H分IO坦“x Bna八HHy.flo3ToMy reMorH只3Toro HHTepeeHoro pa直oHaB卫盯epaTypeocBe坦eHa noKae…  相似文献   

Numerical Experiment on Two-Dimensional Line Thermal     

J.H.W.LEE  G.Q.CHEN 《中国海洋工程》2002,16(4):453-467

The time evolution of a two-dimensional line thermal-a turbulent flow produced by an initial element with signifi-cant buoyancy released in a large water body, is numerically studied with the two-equation k - e model for turbulence closure. The numerical results show that the thermal is characterized by a vortex pair flow and a kidney shaped concentra-tion structure with double peak maxima; the computed flow details and scalar mixing characteristics can be described by self-similar relations beyond a dimensionless time around 10. There are two regions in the flow field of a line thermal: a mixing region where the concentration of tracer fluid is high and the flow is turbulent and rotational with a pair of vortex eyes, and an ambient region where the concentration is zero and the flow is potential and well-described by a model of doublet with strength very close to those given by early experimental and analytical studies. The added virtual mass coeffi-cient of the thermal motion is found to be approximat  相似文献   

影响西太平洋台风形成的大尺度环流条件   总被引：14，自引：1，他引：14  

丁一汇  E. R. 莱特 《海洋学报》1983,5(5):561-574

根据全球热带气旋频率的统计[1],这些频率有明显的年际变化。在过去二十年中全球热带气旋数年变化的百分率为其平均数的-13%-+23%,最多和最少年热带气旋数差达28个,相当于全球年平均热带气旋数(79)的35%。目前认为有三个原因可能影响热带气旋频率:大尺度环流,海面温度和地球以外的因子。  相似文献   

长江入海沉积物的输送及其入海后的运移   总被引：3，自引：0，他引：3  

杨作升  J．D．米利曼 《山东海洋学院学报》1983,13(3):1-12,i001

前言 长江和黄河是世界著名的多沙河流，每年入海泥沙分别为5亿吨和11亿吨，分别占世界的第四位和第二位。千万年来由她们发育了广大的冲积平原，浩浩荡荡东流入海，形成东中国海大陆架沉积物的主要来源。研究长江和黄河沉积物搬运入海的沉积动力过程，不仅对东海大陆架的了解和开发有重要意义，也给陆上经济发展提供科学依据。  相似文献   

黄河口水下底坡微地貌及其成因探讨   总被引：3，自引：2，他引：3  

陈卫民  杨作升  D.B.Prior 《中国海洋大学学报(自然科学版)》1992,(1)

高分辨率的回声测深、旁侧声纳及浅地层剖面记录首次直观地揭示了黄河口水下底坡上发育有大量形态不同的微地貌类型。据其形态特征和规模的差异,将它们划分为平滑海底、凹坑与洼地、冲沟、残留岗丘及扰动复合海底等五种类型。这些微地貌分布在不同水深条件下的不同水下三角洲单元上,并存在着相互联系和相互转化。黄河口海域特殊的沉积环境和复杂的动力条件是导致水下底坡微地貌形成发育的主要机制。  相似文献