夏季不同下垫面气象要素的对比分析   总被引：5，自引：4，他引：5  

娄德君李治民  孙卫国 《气象科技》2006,34(2):166-169

对扎龙湿地生态气象站和齐齐哈尔自动气象站2004年6~8月的逐时气温、风速、相对湿度等观测资料进行统计分析,找出了不同下垫面的两站之间不同时次各气象要素的差异,指出两站风速、气温、露点温度、相对湿度、地面温度等的月平均值均存在差异,变化幅度及极值出现时间各有不同;下垫面差异只起到加强或缓和气象要素日变化幅度的作用。所得结果有助于深入了解扎龙湿地的天气变化规律,对未来扎龙湿地气象要素的精细预报以及湿地资源的开发、保护和管理有一定的参考意义。  相似文献   

天然饱水条件下黄铁矿氧化过程的热力学探讨   总被引：1，自引：0，他引：1  

魏有仪  罗健 《矿物岩石》1998,(Z1)

本文从化学热力学角度讨论了黄铁矿在低温低压条件下通过化学作用氧化的历程,指出了决定黄铁矿氧化速率的步骤是黄铁矿的溶解作用,并对一实际水样进行了化学反应的平衡分析  相似文献   

利用声波测井计算岩石的力学参数   总被引：6，自引：0，他引：6       下载免费PDF全文

楼一珊 《探矿工程》1998,(3):47-48

介绍了岩石力学参数的测量方法及岩石动、静弹性参数相关关系,最后用实际声波测井资料来分析计划岩石的力学参数。  相似文献   

Diagenetic reactions in reservoir strata and geochemical properties of pore fluid and its origin in Songliao Basin     

楼章华  蔡希源等 《中国地球化学学报》1998,17(4):346-355

The reservoirs of the SOngliao Basin are composed of typical unstable sandstones,with high percentages of volcanic fragments and feldspar,In the course of sedimentation and burying,a series of physical and chemical reactions took place between minerals and pore water and water-rock reactions and ion exchange caused changes in ion assemblage of pore water,Hydration-hydrolysis,dissolution and the albitization of feldspar made many ions free from their framework and inter into the pore water,and induced the precipitation of a large amount of authigenic minerals such as smectite and chlorite,During the diagenesis of sandstone.diagenetic reactions involved several stages with increasing depth,and so did the precipitation of authigenic minerals and the transformaiton of minerals.The migration of ions is related with the precipitation,transformation and dissolution of authigenic minerals.Thus,to deepen our study on sandstone diagenesis is an important link for the analysis of ion migration in the evolution of pore water ,the origin and evolution of pore water could be tracked in terms of the geochemistry of fluid inclusions in authigenic minerals.And the isotopic composition of the authigenic mineral calcite can provide its genetic information.  相似文献   

Coupled galactic density-wave modes in a composite system of thin stellar and gaseous discs     

Yu-Qing Lou  & Zuhui Fan 《Monthly notices of the Royal Astronomical Society》1998,297(1):84-100

A rotating disc galaxy is modelled as a composite system consisting of thin stellar and gaseous discs, which are described by a two-fluid modal formalism. The composite disc system is assumed to retain axisymmetry in the background equilibrium. General density-wave perturbations in the two discs are coupled through the mutual gravitational interaction. We study the basic properties of open and tight spiral density-wave modes in such a composite disc system. Within the Lindblad resonances, perturbation enhancements of surface mass density in stellar and gaseous discs are in phase; this is also true during the initial growth phase of density-wave perturbations. Outside the Lindblad resonances, there exists a possible spiral density-wave branch for which perturbation enhancements of surface mass density in stellar and gaseous discs are out of phase. We discuss implications of these results on the critical parameters for global star formation in barred and normal spiral galaxies and on magnetohydrodynamic density waves within the Lindblad resonances.  相似文献   

Quadratic correction to the linear wave spectrum of two-dimensional random waves     

宋金宝  田纪伟  楼顺里 《中国海洋湖沼学报》1998,16(2):137-143

ImooUcrIONAtfrequendesseveraltirathatofthespeCtralpcak,thewaveelevationhigherordercomPonentS'contributionstothewavespatrumaremoresignificantthanthosefromthelinearcomPonentS.Tick(l959)firstproposedandevaluatedtheserendxidespodrumofunidindionalrandomwaves.TheexpnaionderivedbyDingPingxingetal.(l994)forthesecondxirderspeCtmmisanimProvernentofTick's.TickandDingPingxingetal.didnotaanuntforthirdxirderperturbations,althoughthethirdxirdersolutionefhaonthequadraticspeCtrumisofthesameorderofmagnit…  相似文献   

布机监测系统中的数据通讯和数据处理     

刘镜年  邵桂凤  娄建朝 《武汉大学学报(信息科学版)》1988,(3)

本文介绍布机监测系统中的数据通讯和数据处理的设计概念及其实现方法。  相似文献   

核废物地质处置中岩石选用现状及其开发研究          下载免费PDF全文

楼凤升 《岩石矿物学杂志》1988,7(2):137-143

核废物处置已成为当务之急,其目的是要保证人类与环境的安全。普遍采用的方法是地质处置,即保寻安全封闭的天然屏障。为此,岩石的研究就至关重要。目前,各国选用的岩石不一,并不断变化,主要为石盐、粘土和花岗岩。开发研究总趋势是建立地下实验室,进行现场试验。  相似文献   

北半球夏季风时期东半球越赤道气流通道的研究   总被引：12，自引：3，他引：12  

李曾中  楼光平 《大气科学》1987,11(3):313-319

本文利用1974—1979六年的格点风资料,分析了北半球夏季风期间(6—9月)东半球对流层低层及高空的越赤道气流通道.指出在该地区低空具有气候意义的仅有45°E、105°E、150°E及70°E四条通道.高空则存在两条主要的自北向南越赤道气流通道:100°E及60—70°E.根据连续方程,计算了1979年6—8月850、700、500、300、250及200hPa各层的垂直速度ω,指出在东半球存在两支主要的季风经圈环流.  相似文献   

中尺度模式云降水物理方案介绍   总被引：13，自引：6，他引：13       下载免费PDF全文

楼小凤胡志晋  王鹏云周秀骥 《应用气象学报》2003,14(Z1):49-59

介绍大气模式中湿过程的饱和凝结、对流参数化和显式云物理三种方法的适用条件和特点.中尺度大气模式的对流参数化和显式过程一般有多种方案,介绍了多种方案的主要处理方法、基本微物理过程、预报量和主要特点.对流云模式都采用显式过程,但不同模式的湿过程有一定的差别,有各自的微物理特点,对有代表性的云物理方案进行了叙述和分析.  相似文献