太湖水面蒸发量预报模型及其应用   总被引：3，自引：2，他引：1  

毛锐 《湖泊科学》1992,4(4):8-14

介绍了几种太湖水面蒸发量的数学模型和预报模型,并用其预测伏旱和夏涝期间旬、月的湖面蒸发量。最后提出应用湖面蒸发量进行太湖水位预报的方法。  相似文献   

基于Oracle XML DB的GML空间数据存储机制     

王晓明  李景文  李恺毅  程小凯  朱明 《地理空间信息》2010,8(5):50-52

在分析Oracle XML DB11g存储空间信息的模式基础上,探讨基于GML的空间数据组织表达过程,研究基于Oracle11g的GML空间数据的存储机制和存储方法,为不同数据格式的空间数据之间的共享与互操作提供了新的思路和途径。  相似文献   

Geo-hazards risk zonation and warning system based on GIS in Anshan City of Liaoning     

Zhishuang YANG  Mao PAN  Xiaopeng WANG 《世界地质(英文版)》2006,9(2)

Debris flow and Karst collapse are the main parts of geological disasters in Anshan, which have affected on the construction and development of the social economy of Anshan. In order to enhance the studies of rules of disaster and give scientific estimation and alarm ahead of schedule warning, we established the warning system of Anshan and investigated the corresponding software, which are based on the deep discussions about the crisis estimation and methods of prediction of disasters. In this paper, the foundation of model used in estimating the alarm ahead of schedule for disaster and the methods of appraisal for the alarm ahead of schedule are discussed. This system for warning and evaluating is the combination of the models of warning and GIS flat roof, with so many virtues, such as complete functions, convenience, applicability, which has considered the output of data, analyses of space, chooses of model, output of production, report of information for warning and the statements and help of system.  相似文献   

Selective breeding and pedigree foundation of Litopenaeus vannamei     

CHEN Mao  WU Chang-gong  XIANG Jian-hai  HUANG Hao  LIU Xiao-lin  LIU Cui-hong  HE Jian-guo  SUN Cheng-bo 《海洋科学》2008,32(11)

  相似文献   

Method for observation of deembedded sections of fish gonad by scanning electron microscopy     

毛连菊 《中国海洋湖沼学报》2000,18(3):283-288

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｉｎｔｒａｃｅｌｌｕｌａｒｓｕｒｆａｃｅｏｆａｃｅｌｌｃｏｕｌｄｂｅｏｂｓｅｒｖｅｄｂｙｕｓｉｎｇｓｃａｎｎｉｎｇｅｌｅｃｔｒｏｎｍｉｃｒｏｓｃｏｐｅ(ＳＥＭ)ａｎｄｔｈｅｆｒｅｅｚｅｆｒａｃｔｕｒｅｔｅｃｈｎｉｑｕｅ .Ｅｘｐｏｓｉｎｇｔｈｅｃｅｌｌｓｕｒｆａｃｅｉｓｔｈｅｍｏｓｔｄｉｒｅｃｔａｐｐｒｏａｃｈ .Ｉｎｔｈｉｓｔｅｃｈｎｉｑｕｅ,ａｌｌｅｘｐｏｓｅｄｓｕｒｆａｃｅｓｃｕｔｏｐｅｎｄｕｒｉｎｇｓｅｃｔｉｏｎｉｎｇｃｏｕｌｄｂｅｖｉｅｗｅｄｂｙＳＥＭ (Ｒｕｓｓ…  相似文献   

地图目标移位的面目标变形约束及其处理(英文)     

毛建华  曾齐红  刘学锋 《地球空间信息科学学报》2009,12(2):117-122

The displacement operator is an important and still a hot topic in map generalization. In the generalization product, symbols must be unambiguous and easily perceived and readily understood, which makes space competition among features an important obstacle in the process of map objects displacement. Space conflict between objects, through propagation process, may be spread and more objects may drift into it. In order to maintain symbols equilibrium and spatial relationship between objects, some unimportant symbols or parts of symbols should be distorted under constraints according to visual graphic resolution thresholds to figure out space competition among map features. Three constraints including position, legibility and characteristics are important for the maintenance of symbols equilibrium and spatial relationship, which are discussed in this paper. The skeleton is introduced to represent area objects figure characteristic, in which an area object can be separated to parts hierarchically according to their importance in the construction. Then, the finite element method is applied to the map objects’ displacement and distortion, in which a strategy for the parameters of finite element method is discussed. Supported by the National Science Foundation of China (No.40401050), the Leading Academic Discipline Project of Shanghai Educational Committee (No.J50104), the Science Foundation of Shanghai Education Department (07ZZ09).  相似文献   

辽西肖家营子钼(铁)矿床Re-Os年龄及其地质意义   总被引：6，自引：0，他引：6  

代军治毛景文  杜安道谢桂青 白杰杨富全  屈文俊 《地质学报》2007,81(7):917-923

肖家营子矿床是一个与中—基性侵入岩有关的夕卡岩型钼(铁)矿床,也是中国北方目前已知钼品位最高的矿床。钼、铁矿体主要呈脉状、透镜状、似层状赋存于夕卡岩体中。本文利用Re-Os同位素定年方法对主要矿化体中6件辉钼矿样品进行了成矿时代研究,获得等辉钼矿Re-Os同位素等时线年龄为(165.5±4.6)Ma,成矿年龄属于中侏罗世晚期,与燕山运动的中间幕时间一致,是燕山内陆造山作用的产物。该Re-Os定年结果限定了与钼矿床形成密切相关的细粒似斑状闪长岩的成岩年龄应该在180~160Ma间,这不但为华北北缘燕辽钼矿带的研究提供了新的重要证据,而且对深入研究燕山运动具有重要意义。  相似文献   

塔里木板块西南缘钾质煌斑岩地球化学及源区特征   总被引：5，自引：0，他引：5  

柴凤梅帕拉提&#  阿布都卡迪尔张招崇毛景文董连慧木合塔尔&#  扎日 《地质论评》2007,53(1):11-21

塔里木板块西南缘克里阳山区的钾质煌斑岩呈脉状产于前寒武纪埃连卡特群变质沉积岩中,其主要岩石类型有:金云母透辉石煌斑岩、假白榴石透辉石煌斑岩和含球粒透辉石煌斑岩。所有岩石具有低的SiO2(41.31%～44.84%)、TiO2(0.75%～0.86%)和高的MgO(7.30%～11.33%)和K2O(4.01%～6.01%)含量,K2O/Na2O比值介于2.77～12.49之间。同时,它们具有富集大离子亲石元素(Rb、Sr、Ba、Th、U、K)和轻稀土元素(LREE),相对亏损高场强元素(Nb、Ta、Zr、Hf、Ti)的特征,并且具有高的Sr同位素比值、相似的高度分异的REE配分模式。这些岩石的母岩浆来自于金云母角闪石石榴子石二辉橄榄岩的富集地幔,是该富集地幔部分熔融约5%～10%的产物,岩浆在上升侵位过程中受到地壳物质的混染较弱。富集地幔是俯冲的板块释放的富含钾质流体交代的结果。  相似文献   

基于网格细分技术的三维地质模型光滑方法研究   总被引：1，自引：1，他引：0  

屈红刚  潘懋  董攀  柴华  明镜 《地理与地理信息科学》2007,23(6):14-17

针对粗糙的三维地质模型,利用网格细分技术,生成加密光滑的三维模型。分析网格细分技术在三维地质建模中的应用需求以及Loop细分和改进的蝶形细分技术,为保持地质体之间公共面数据的一致性,对"改进的蝶形细分法"做了进一步改进,增加了对边界约束的处理。探讨利用细分技术生成多分辨率模型,通过试验验证了该方法的有效性。  相似文献   

赤道海洋波动弱非线性动力学系统浅析   总被引：2，自引：0，他引：2  

王凡  吴德星  冯士笮  侍茂崇 《海洋科学》1998,22(3):40-42

通过对连续层化条件下赤道海洋波动及相关环流特征尺度和物理量的尺度分析,全面分析了赤道海洋波动及其相关环流所属动力学系统的性质。分析结果表明,该系统为以参数ε为表征的弱非线性动力学系统,在此基础上建立了适合描述赤道波非线性效应的动力学模型。  相似文献