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.     

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。     

Scheduling Truck Arrivals at an Air Cargo Terminal

We consider the scheduling of truck arrivals at an air cargo terminal. By coordinating arrivals of cargo delivery trucks with outbound flight departure schedules, some of the shipments can be transferred directly to the departing flights, while others will be stored at the terminal's storage facility and incur extra handling and storage costs. The objective is to obtain a feasible schedule so as to minimize the total cost of operations. We formulate the problem as a time‐indexed integer program and show that, even with limited number of unloading docks at the terminal, the problem is non‐trivial (NP‐hard in the strong sense). Our solution method includes an exact solution procedure to determine an optimal unloading sequence for the shipments carried by each truck, together with a Lagrangian relaxation‐based heuristic for assigning trucks to truck docks and determining truck arrival times. We conducted computational experiments to test the performance of our solution method. Computational results show that our method can generate near‐optimal solutions efficiently. Our simulation results indicate that the scheduling approach proposed in this paper has the potential to generate significant cost savings over a first‐come, first‐served approach currently used at the air cargo terminal that we observed.     

Mass Customization in the Automotive Industry: Comparing Interdealer Trading and Reconfiguration Flexibilities in Order Fulfillment

Mass customization has been viewed as desirable but difficult to achieve in the volume automotive sector. Here we consider flexibility in automotive order fulfillment systems to enhance the ability to satisfy customers with their desired vehicle variants within acceptable delivery lead times. Two types of flexibility are compared in a Virtual‐Build‐to‐Order system—reconfiguration in the planning pipeline and interdealer trading. A representative simulation model is used to investigate the impact of the two types of flexibility across a wide spectrum of product variety levels. The impacts on major stakeholders in the system—the producer, dealers, and customers—are considered. The study shows that both types of flexibilities can bring significant benefits in terms of reductions in lead time and inventory holding. The level of product variety strongly influences the observed effects—an important finding in the mass customization context. Upstream reconfiguration flexibility brings greater benefits than downstream trading flexibility. Reconfiguration tends to dominate trading as a fulfillment mechanism when both are in operation. The findings have implications for the design and management of automotive order fulfillment systems in improving their ability to offer mass customization. The study has relevance for companies in other sectors with high levels of variety that seek to combine efficiency, speed, and flexibility in order fulfillment.     

汽车加热器内燃烧的数值模拟

利用AVL公司开发的FIRE软件,对一典型结构蒸发混合式汽车加热器燃烧室内的燃烧过程进行了数值模拟.其中,蒸发和燃烧分别采用Wall Film模型、Coherent Flame模型,氮氧化物(NOx)采用Zeldovich不平衡原理建模,碳烟(Soot)模型为FIRE模型.计算结果及分析表明,一层进气孔布置对燃油蒸汽浓度分布影响很大.加大进气孔直径使进气中心涡流增强,燃油在一级燃烧室中蒸发量增加.主要燃烧发生在二级燃烧室.进气孔切向进气能形成较强的中心涡流,使燃烧高温区主要集中在二级燃烧室的纵向轴心附近.一级燃烧室的周向涡区和二级燃烧室上半部的高温区是Soot生成速率最大的部位;最高燃烧温度未达NOx的生成温度条件,其生成量极少.     

中国古代"阴阳"物质观形成初探

"阴阳"物质观念的形成经历了原始阴阳观念、气分阴阳观念和科学阴阳观念三个历史阶段,中国古代贤哲制造了土圭、阳燧等工具并进行了长期的高山探索,证明了阴阳现象的物质基础.