逐步Logistic判别分析     

吕纯濂 Mathes  H 《南京气象学院学报》1991,14(3):316-324

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测绘行业贯彻ISO9000族标准的若干思考     

潘宝玉  张绍廷  姜道利 《测绘工程》2001,10(4):49-52

随着社会主义市场经济的日益完善和管理科学的不断发展，产品质量越来越引起各行各业的高度重视。为了促进测绘行业质量管理的科学化，程序化和标准化，逐步实现管理模式与国际接轨，提高测绘质量管理水平，增强市场竞争能力，在绘行业推行ISO9000族标准已势在必行。文中简要介绍了ISO9000族标准的基本概念，阐述了贯彻认证的意义，方法及步骤等。  相似文献   

地球化学填图与地球化学块体的谱系分析——编号系统及谱系树图的自动绘制   总被引：2，自引：0，他引：2  

周晓东伍玲  曹全欣 《地质通报》2007,26(7):92-898

中国的地球化学填图研究工作起步较早并发展成为在国际上具有明显优势的学科。在此基础上提出的地球化学块体理论通过一定的编号系统绘制谱系树图来追索某元素在块体内部逐步浓集成矿的轨迹。通过谱系树图可以发现不同级别的子块体之间的亲缘关系,研究它们在时间和空间上的分布规律,结合已发现矿床的信息,预测潜在矿床的分布及其储量,从而指导找矿工作。提出了一种全新的谱系编号系统并编制了在计算机上自动绘制谱系树图的软件,同时实现了与原有编号系统的一致,解决了长期以来谱系树图不能自动绘制的问题,为地球化学块体的研究提供了一个很好的工具。  相似文献   

MORAL GEOGRAPHY IN HIGH PLAINS HISTORY     

JOHN OPIE 《Geographical review》1998,88(2):241-258

ABSTRACT. When American society, through deliberate government action, intervenes to preserve the family farm as the locus of “good” human values and “authentic” environmental conditions, the result can be described as a moral geography. Nowhere is this clearer than in the protection of traditional farming on the High, or Great, Plains through federal funding and programs. Protection began during the Dust Bowl of the 1930s; federal support came to a close with the passage of the 1996 farm bill. These shifts deserve assessment of historic American interests in the protection of an agricultural institution and of a region at risk.  相似文献   

Improving the simulation of fine-resolution landscape changes by coupling top-down and bottom-up land use and cover changes rules     

Thomas Houet  Noémie Schaller  Mathieu Castets  Cédric Gaucherel 《International journal of geographical information science》2014,28(9):1848-1876

Modelling land use and cover changes (LUCC) at local and landscape scales simultaneously, in terms of composition and configuration, remains today highly challenging. Agricultural landscapes offer an illustrative context for this purpose. This article presents a modelling platform (DYPAL) able to simulate LUCC at both local (agricultural parcel, farm) and landscape levels by combining LUCC processes with an optimization algorithm. The efficiency of this approach is assessed by comparing it with an approach applying the same LUCC processes without optimization. Simulations have been developed for two representative case studies of temperate intensive agricultural mosaics: (1) neutral landscapes with simple and theoretical rules and (2) observed landscapes with realistic crop successions rules. Results show that this modelling platform improves the simulation of LUCC achieved at fine resolution, although not systematically. Improvements are observed when compared to theoretical farming practices. But, when compared with an observed landscape, it is true for one type of (arable) farms only. Several hypotheses are discussed, such as the fact that farmers possibly do not follow optimized rules. Finally, this study illustrates that the use of several indices is crucial to assess whether a simulated landscape is realistic or not, because it does not rely to the assessment of the predictive power of the model.  相似文献   

柴达木盆地西部油族划分及成因研究     

王强  王飞宇  陈琰  冯伟平  袁莉 《地球化学》2014,(2):122-130

对柴达木盆地西部各油田的151个原油进行了分子地球化学分析,并选取伽马蜡烷/C30藿烷、升藿烷指数、甾烷C27/C29和三环萜烷/C30Hop四个参数作为变量进行SAS聚类分析。结合常规二维散点图法,柴西原油可以分为3个油族7个亚族：油族Ⅰ以强水体分层、强还原环境为特征,主要分布于西端的七个泉、红柳泉地区,该油族可以分为两个亚族,油亚族②相比于油亚族①具有更高的甾烷 C27/C29比值;油族Ⅱ主要分布于狮子沟、花土沟、跃进和南翼山油泉子地区,在七个泉、红柳泉等地区也有分布,以相对较强的水体分层、还原环境为特征;油族Ⅲ主要分布于东（南）部的切克里克、乌南、绿草滩、咸水泉、跃西和跃进Ⅱ号等地区,以水体分层变差、较还原环境为特征,该油族可以分为3个亚族,其中油亚族⑤则具有异常低的三环萜烷/C30Hop 比值,油亚族⑥具有异常高的甾烷 C27/C29比值,油亚族⑦则具有异常高的三环萜烷/C30Hop 比值。油族空间分布特征受下干柴沟组源岩有机相在空间上的变化制约,下干柴沟组源岩发育时期,自西向东地层沉积速率增大,水体的分层变差、还原性降低,导致陆源输入的增加以及有机质保存条件变差。  相似文献   

青岛小珠山花岗岩岩石谱系单位划分及其主要特征   总被引：3，自引：0，他引：3       下载免费PDF全文

周汝国   《山东国土资源》2001,17(6):32-38

青岛小珠山花岗岩体为中生代偏碱性侵入岩,过去通称小珠山岩体,通过15万区域地质填图,将其划分为15个单元,划归为大店和崂山两个超单元.对各单元的岩石学、岩石化学、微量元素及稀土元素特征等进行了分析研究,认为应属A型花岗岩,为燕山晚期之产物.  相似文献   

宜昌地区早志留世（Llandoverian）腕足类一新科Spinochonetidae (fam. nov.)及其意义     

曾庆銮  张淼  李志宏 《地质学报》2015,89(4):681-691

腕足类新科Spinochonetidae(fam.nov.)建立在宜昌地区志留系兰多维列统罗惹坪组下段中部(上埃隆阶)的Spinochonetes Rong,Xu et Yang(1974)和Spinolella(gen.nov.)两个属,以及一个属、种未定的分类单元的基础上。新科成员仅有从腹壳喙部伸出一根直的腹喙刺,这与Chonetoidea超科内的Strophochonetidae科以及Chonestrophiidae科众成员的铰合缘刺都是从腹壳铰合缘上伸出来的有着本质差别。另外,本文还对Spinochonetes以及它的属型种S.notata Rong,Xu et Yang(1974)进行重要图解和补充描述。与此同时,对Spinolella(gen.nov),以及S.minuta(gen.et sp.nov.)进行系统描述和对比。据目前所知,新科成员只分布于我国鄂西、黔东北、陕南和川北等地,属于上扬子台地的土族居民。因为Spinochonetidae(fam.nov.)属于腕足类独特的一个类型,演化快,贝体极小,保存精美,因此具有分类学、地层对比,以及恢复古环境等方面的重要意义。  相似文献   

k=6,7,8,9的一类新几乎差族     

张媛  彭茂 《南京气象学院学报》2013,5(2):188-192

C.Ding和J.Yin推广了几乎差集,定义了新的几乎差族的概念.通过有限域中分圆类的方法给出了几乎差族新的构造方法,并得到了k=6,7,8,9的一类新的几乎差族.  相似文献   

BOOK REVIEWS     

《The Professional geographer》1988,40(1):116-131

Books reviewed in this article: Boundary Control and Legal Priniciples . Curtis M. Brown , Walter G. Robillard and Donald A. Wilson . Lost Initiatives: Canada's Forest Industries, Forest Policy, and Forest Conservation . R. Peter Gillis and Thomas R. Roach . The Navajo Atlas: Resources, People, and History of the Dine Bikeyah . James M. Goodman . The City and the Sign . M. Gottdiener AND Alexandros Ph . Lagopoulos , EDS. The Comfortable House: North American Suburban Architecture 1890–1930 . Alan Gowans . Arabic-Islamic Cities. Building and Planning Principles . Besim Salim Hakim . Contemporary Climatology . Ann Henderson -Sellers and Peter J. Robinson . A Trace of Desert Waters . Samuel G. Houghton . Geography, Resources and Environment. Vol. 1: Selected Writings of Gilbert F. White. Vol. 2: Themes from the Work of Gilbert F. White . Robert W. Kates AND Ian Burton , ED. Spatial Dimensions of Unemployment and Underemployment (A Case Study of Rural Punjab) . Gopal Krishan . Maps of the Holy Land: Cartobibliography of Printed Maps, 1475–1900 . Compiled by Eran Laor , assisted by Shoshana Klein . The Geography of Third World Cities . Stella Lowder . A Perspective on U.S. Farm Problems and Agricultural Policy . Lance Mc Kinzie , Timothy G. Baker AND Wallace E. Tyner . Soil Erosion and Its Control. R.P.C . Morgan , ED Geopolitics . Patrick O'Sullivan . Landscape, Meanings and Values . Edmund C. Penning -Rowsell AND David Lowenthal , EDS.  相似文献