Comparing Estimates of the Effects of Air Pollution on Human Mortality Obtained Using Different Regression Methodologies

Studies using regression techniques report their results using a variety of statistics. Evaluation of the consistency of findings, such as in a metaanalysis, requires calculating the statistical estimates of the effect reported in each study in a comparable manner. In this paper, we consider multiple linear regression, multiple Poisson regression, and logistic regression estimates. We present results that are needed to calculate, on a common basis, the slope of the regression function at a specified value, the elasticity function of the regression function at a specified value, the relative risk at a specified value, and the odds ratio at a specified value. We apply these results to studies of the association of daily mortality in an area to the daily air pollution level of ozone and PM₁₀. We calculate the estimated slope of the number of deaths per billion population associated with an increase of 1 ppb of ozone level in studies of daily mortality in three urban areas. These studies, in Los Angeles, New York, and St. Louis, produced very comparable results on a common basis, especially when compared to the coefficients as reported. We also calculated the estimated elasticity function of the daily mortality and daily PM₁₀ level for eight areas and found that the elasticities varied within a factor of roughly two, much less than the variability in the coefficients as reported.     

我国空管安全管理体系实然性研究

安全体系、空管安全管理体系、国际良航组织界定的SMS三者既相互关联，又相互区别。建立我国空管安全管理体系，需要对空管安全管理要素有很好的涵盖率和关照度。按照国际民航组织（ICAO）倡导的科学方法论的理念，结合我国实际，建构具有适切性、系统性、整体性特征的我国空管安全管理体系。     

可编程控制器在洁净空调自动控制系统中的应用

介绍了可编程控制器(PLC)在洁净空调控制系统中应用的实例，对应用中遇到的问题提出了解决方案，并对PLC在洁净空调系统中推广使用的前景进行了分析。     

阿那克西米尼的气一元论哲学的当代思辨

根据已知的文献资料,可以把阿那克西米尼的哲学看作以气为最高根据去说明一切的气一元论哲学。气、气的性质、气的形态三者的有机统一构成了一切事物的基本模型。阿那克西米尼的哲学在有记载的西方哲学史上首次揭示了量的原则在事物形成中的作用,但也因此产生了某些逻辑上的困难。     

室内空气污染及其控制对策

从室内空气污染物主要来源、污染物及其危害入手，针对我国国情和以往我国室内空气质量控制存在的问题，从社会、技术等角度提出行政管理对策和技术防治对策．     

湛江大气环境质量现状与分析研究

湛江2000～2002年的空气质量年总优良率的横(纵)向对比结果显示:3年来,湛江大气环境质量总体达到国家空气质量Ⅰ级标准(优)、Ⅱ级标准(良)分别占59.91%、40.09%;年度Ⅰ级(优)总天数比率分别为86.65%、70.14%、23.08%,其中2001年的空气质量Ⅰ级(优)率比2000年下降16.51个百分点,2002年的空气质量Ⅰ级(优)率比2001年下降47.06个百分点,比2000年下降63.57个百分点,空气质量变化较大,呈直线下降趋势.月均污染指数、季均优良率的横向和纵向对比结果也表明,近年湛江空气质量逐渐下降,应引起注意.     

A1—10%Pb—钢双金属材料水平连铸复合结晶器的选用

本文从冷却速度及其对连铸复合材料组织和性能的影响的角度分析所选择的结晶器材料的适用性,在此基础上,选用了石墨结晶器外加水冷铜套的连铸复合系统来生产Al—10％Pb—钢双金属材料,并定量地给出了石墨结晶器上下型的主要尺寸。     

Technical Uncertainty in Quantitative Policy Analysis — A Sulfur Air Pollution Example

Expert judgments expressed as subjective probability distributions provide an appropriate means of incorporating technical uncertainty in some quantitative policy studies. Judgments and distributions obtained from several experts allow one to explore the extent to which the conclusions reached in such a study depend on which expert one talks to. For the case of sulfur air pollution from coal-fired power plants, estimates of sulfur mass balance as a function of plume flight time are shown to vary little across the range of opinions of leading atmospheric scientists while estimates of possible health impacts are shown to vary widely across the range of opinions of leading scientists in air pollution health effects.     

湿空气的图解法及图

本文提出了湿空气的图解法，导出了符合工程习惯的湿空气的计算式，绘制了湿空气的－温图，－压图与－湿图，并给出了算例。本文所提供的湿空气的图解法使湿空气的计算与湿空气其它参数的计算一样简便。     

湿空气热力参数的计算方程

本文通过对有关文献提供的干空气和水蒸汽热力参数的准确值进行的拟合,在宽广的参数范围内给出了湿空气热力参数的计算方程。为制冷、空调、干燥和采暖通风等技术中湿空气的热力性质和热力过程的计算,提供了方便条件。