地形作用下有限振幅Rossby波的稳定性分析     

周定文  彭晓林  罗德海 《成都信息工程学院学报》1990,(Z1)

本文用微分方程定性理论方法分析了地形对有限振幅Rossby波的稳定性影响。结果表明:地形北坡有利于波动出现不稳定,南坡使波动稳定;西坡使导式波动不稳定但使曳式波动稳定,东坡使导式波动稳定但使曳式波动不稳定。  相似文献   

冷岛效应的分析解     

周定文 《成都信息工程学院学报》1990,(4)

本文将冷岛视为一个负的扰动加热源,即冷源,用小扰动方法求出了冷岛效应的分析解,给出了解例,并与热岛效应的结果作了对比分析。  相似文献   

The stability of the planetary three-body problem: Influence of the secular resonances     

Philippe Robutel 《Celestial Mechanics and Dynamical Astronomy》1993,57(1-2):97-98

  相似文献   

EXAMINING LARGE DATABASES:A CHEMOMETRIC APPROACH USING PRINCIPAL COMPONENT ANALYSIS     

ROBERT R.MEGLEN Department of Chemistry  Laboratory for Chemometrics  University of Colorado at Denver  PO Box  Denver  CO -  U.S.A. 《地理学报(英文版)》1991,(3)

Principal component analysis is used to examine large multivariate databases.The graphical approachto exploratory data analysis is described and illustrated with a single example of chemical compositiondata obtained on environmental dust particles.While the graphical approach to exploratory data analysishas certain advantages over the numerical procedures,the empirical approach described here should beviewed as complementary to the more robust treatments that statistical methodologies afford.  相似文献   

PRINCIPAL COMPONENTS REGRESSION FOR ROUTINE MULTICOMPONENT UV DETERMINATIONS: A VALIDATION PROTOCOL     

PAULJ.GEMPERLINE  ALGER SALT 《地理学报(英文版)》1989,(1)

A validation protocol for multicomponent spectroscopic assays based on principal componentsregression is described. Factorial design and hypothesis tests are used to establish the linearity andabsence of interaction between components in the regression model. Testing considers multiple responsevariables simultaneously so that correlation between residuals is properly treated. Assay reproducibilityand sensitivity to related substances are evaluated.  相似文献   

MULTIVARIATE RESPONSE SURFACE MODELLING BY PRINCIPAL COMPONENTS ANALYSIS     

N.BRATCHELL 《地理学报(英文版)》1989,(3)

Analysis of multivariate response data by modelling the principal components of the response has beenapplied to two sets of data. In both cases principal components analysis revealed the relationships amongthe response variables and exploited them to simplify the problem of modelling and optimizing themultivariate response. The models and optima obtained from the principal components comparedfavourably with the individual models and simultaneous optima.  相似文献   

攀枝花市大气污染物降水清除机制的研究     

唐士豹 《成都信息工程学院学报》1989,(4)

本文采用了主成份分析及因子分析的方法,研究了影响降水pH值的主要源及其贡献和这些源被降水清除的机制。分析结果表明:大气中一次污染物是影响降水pH及各种成分浓度的主要因素。人为污染源包括高排放源、低排放源和汽车源,它们的排放物以碱性物质为主;自然污染源包括输送物、腐烂物、自然NOx等,它们的排放物主要是酸性物质;在一般情况下,降水的pH值取决于高、低排放源排放的碱性物质的多寡;降水量越大,清除的污染物越多,在雨季各测点降水平均pH值为6.31～7.10。在高排放源影响小的地方,对持续时间长的大雨,降水后期的pH能反映自然源的影响,其值小于5.60。可见,攀枝花市酸雨几率极低甚至降水呈碱性,  相似文献   

区域地理信息系统在农业中的应用——以福建省浦城县为例     

宋晓红  晏路明  程泽明 《地理学报》1989,(2)

本文应用系统分析的理论和方法，建立了浦城县地理信息系统，分析了信息系统的结构、功能及信息管理过程，并在系统的支持下对浦城县农业发展战略进行决策研究，提出了一系列分析意见，开辟了地理信息系统应用的新领域。  相似文献   

Bromide as a conservative tracer for soil-water studies     

B. S. Levy  R. M. Chambers 《水文研究》1987,1(4):385-389

The assumption that potassium bromide is a conservative tracer for soil-water studies was tested in a series of batch sorption experiments. Sorption experiments were conducted on soil samples collected from the O, E, and A horizons of the Albemarle soil series near Charlottesville, VA. The experiments were conducted under conditions of differing bromide concentration and filter treatments. Bromide concentrations in soil-solution mixtures were measured through time using an Orion bromide-specific electrode. An analysis of variance of results showed no significant sorption of bromide through time under any concentration level or filter treatment (α = 0·01). No sorption of bromide between different soil horizons could be determined. This work clearly indicates that bromide is conservative under the conditions examined.  相似文献   

Automatic interpretation of digital maps     

Volker Walter  Fen Luo 《ISPRS Journal of Photogrammetry and Remote Sensing》2011,66(4):519-528

In the past, the availability and/or the acquisition of spatial data were often the main problems of the realization of spatial applications. Meanwhile this situation has changed: on one hand, comprehensive spatial datasets already exist and on the other hand, new sensor technologies have the ability to capture fast and with high quality large amounts of spatial data. More and more responsible for the increasing accessibility of spatial data are also collaborative mapping techniques which enable users to create maps by themselves and to make them available in the internet. However, the potential of this diversity of spatial data can only hardly be utilized. Especially maps in the internet are represented very often only with graphical elements and no explicit information about the map’s scale, extension and content is available. Nevertheless, humans are able to extract this information and to interpret maps. For example, it is possible for a human to distinguish between rural and industrial areas only by looking at the objects’ geometries. Furthermore, a human can easily identify and group map objects that belong together. Also the type, scale and extension of a map can be identified under certain conditions only by looking at the objects’ geometries. All these examples can be subsumed under the term “map interpretation”. In this paper it is discussed how map interpretation can be automated and how automatic map interpretation can be used in order to support other processes. The different kinds of automatic map interpretation are discussed and two approaches are shown in detail.  相似文献