Designing and integrating composite networks for monitoring multivariate gaussian pollution fields

Networks of ambient monitoring stations are used to monitor environmental pollution fields such as those for acid rain and air pollution. Such stations provide regular measurements of pollutant concentrations. The networks are established for a variety of purposes at various times so often several stations measuring different subsets of pollutant concentrations can be found in compact geographical regions. The problem of statistically combining these disparate information sources into a single 'network' then arises. Capitalizing on the efficiencies so achieved can then lead to the secondary problem of extending this network. The subject of this paper is a set of 31 air pollution monitoring stations in southern Ontario. Each of these regularly measures a particular subset of ionic sulphate, sulphite, nitrite and ozone. However, this subset varies from station to station. For example only two stations measure all four. Some measure just one. We describe a Bayesian framework for integrating the measurements of these stations to yield a spatial predictive distribution for unmonitored sites and unmeasured concentrations at existing stations. Furthermore we show how this network can be extended by using an entropy maximization criterion. The methods assume that the multivariate response field being measured has a joint Gaussian distribution conditional on its mean and covariance function. A conjugate prior is used for these parameters, some of its hyperparameters being fitted empirically.     

世界人口格局中的中国人口转变及其特点

20世纪 50年代以后的中国人口转变与西方传统人口转变有许多不同之处 ,具有自身的特点 ,即转变的迅速性、控制干预性、不彻底性、不稳定性、不平衡性。把握新时期稳定低生育水平的决定是将我国人口转变进行到底的重要措施和手段 ,是实现人口可持续发展的重要步骤     

莱麦草染色体组分析及染色体变异的观察

通过对有丝分裂中期及减数分裂终变期染色体数目统计,形态、行为的观察,发现莱麦草染色体呈现广泛的变异：有丝分裂中期株内染色体数目在2n＝11──56内变化,含有本物种染色体数目2n＝28的细胞仅占统计数的27．8％。减数分裂终变期出现36％具非整倍性的花粉母细胞,染色体数除数目变异外还有结构变异如Robertson易位等。本文对该种进行了染色体组分析,确认其为同源四倍体。同时对该物种株内产生混倍性的原因,在物种进化上的意义进行了探讨。     

PSS码词组输入法及教学实践

本文介绍了PSS码（拼音、声调、首笔码）汉字输入法的词组编码及输入方法,并总结了PSS码作为一门选修课的教学效果。     

知识经济与教育改革

本文通过对知识经济及其概念特征的剖析,揭示了知识经济时代对人的素质的基本要求。并由此提出了若干教育改革的方略和教育创新的要求     

中国社会工作教育协会第五届年会暨学术讨论会综述

2006年8月13日,“中国社会工作教育协会第五届年会暨职业化前景下中国社会工作理论与实践学术研讨会”在山东济南隆重召开。会议由中国社会工作教育协会主办,山东大学哲学与社会发展学院社会工作系承办。来自海内外的近三百名专家学者出席了本次会议。本届年会是在我国社会工作     

尼赫鲁外交思想形成探析

印度独立后的外交政策深受其开国总理尼赫鲁本人的印度观、世界观、价值观和道德观的影响。尼赫鲁的思想观念就像印度本身那样充满了矛盾,可以说是多种意识形态和思想观念的混合体,民族主义、民主主义、社会主义和国际主义都在他的思想和实践中有所表现。尼赫鲁外交思想的形成既与他本人的经历和他所处的时代背景有关,同时也受到了印度独特的历史、社会和思想文化传统的深刻影响。     

印度经济发展跨上新台阶

印度经济增长率连续三年平均超过8%。新经济领域继续闪亮,服务业快速发展,财政状况好转,外汇储备充裕,物价稳定,股市兴旺。总理曼莫汉·辛格表示,印度经济增长率在数年内将达到10%。但农业增长停滞、能源短缺和基础设施落后为三大瓶颈,国内安全也存在一些难题。印度经济崛起还需付出艰辛努力。     

A multivariate zero-inflated binomial model for the analysis of correlated proportional data

In this paper, a new multivariate zero-inflated binomial (MZIB) distribution is proposed to analyse the correlated proportional data with excessive zeros. The distributional properties of purposed model are studied. The Fisher scoring algorithm and EM algorithm are given for the computation of estimates of parameters in the proposed MZIB model with/without covariates. The score tests and the likelihood ratio tests are derived for assessing both the zero-inflation and the equality of multiple binomial probabilities in correlated proportional data. A limited simulation study is performed to evaluate the performance of derived EM algorithms for the estimation of parameters in the model with/without covariates and to compare the nominal levels and powers of both score tests and likelihood ratio tests. The whitefly data is used to illustrate the proposed methodologies.     

科学发展观是中国特色社会主义的最新理论成果和行动纲领

科学发展观是十七大报告的灵魂和主线。作为中国特色社会主义理论体系的重要组成部分,科学发展观兼有理论创新和战略选择双重意义。实现十七大提出的奋斗目标,必须把科学发展观作为行动纲领,不断深入地贯彻落实。