钛液薄膜蒸发器结垢原因分析及消除措施

在硫酸法钛白粉的生产过程中,一般采用薄膜蒸发器进行稀钛液的浓缩。这种蒸发器高效节能,但在实际生产中容易产生严重的结垢现象,既影响了生产能力的发挥,又增加了蒸汽消耗,浪费了能源。经过化验分析确定产生结垢的物质主要是硫酸钙,影响其结垢的因素有温度、溶液中含盐浓度、压力、误操作等。针对这些影响因素,提出了一系列的改进措施,实施后,结垢现象大为减轻,生产得以顺利进行。     

移民项目销号问题研究

阐述移民项目销号的意义和目的,结合三峡工程实际,分析并研究了移民项目销号的定义、内容、原则、对象、条件、程序及管理,提出高度重视,加强领导,全力推进移民项目销号工作;加强宣传和思想教育工作,消除移民思想顾虑;尽快制定、出台移民项目销号管理办法;严明纪律,确保移民项目销号质量;及时研究和解决移民项目销号的资金缺口问题。     

谷物中重金属离子迁移及其污染消控研究进展

针对谷物中重金属不同时间和空间的含量及分布特征,重金属的来源解析和主要形态的分析,以及在种植、加工和食用等过程中造成重金属的污染、迁移和消降等问题进行了科学分析与综述.并从土壤改良、作物品种改良与耕作改革到谷物的收、加、储及食用等一条龙式的全程消控方法及策略等作了详尽讨论与分析.最后就谷物中重金属污染的研究进行了简要的展望与建议.     

面向对象方法及其支撑语言的特征和缺陷

本文从较广的意义上详细讨论了面向对象方法及其支撑语言的主要特征，缺陷及发展。     

A note on the wise girls puzzle

Summary. This article analyzes the two wise girls puzzle, which is a simpler variant of the so-called three wise men puzzle, with some proof-theoretic tools. We formulate the puzzle in an epistemic logic. Our chief assumption is that the reasoning ability of each player of the puzzle is equivalent to what is described by the epistemic logic. We will interpret the behaviors of the players in the puzzle in terms of unprovability of certain statements. The proof-theoretic tools we employ are consequences of a meta-theorem, known as the cut elimination theorem. Received: August 1, 2000; revised version: May 15, 2001     

Time Period and Risk Measures in the General Risk Equation

In an earlier paper, a general risk equation, applicable to all non growth systems, and inclusive of financial systems, was derived. It related expected throughput capacity of any system to both system resources and positive risk of loss of throughput capacity. Two risk measures were required, a new MEL‐risk measure, and the conventional standard‐deviation risk measure.

In this paper we show that the two apparently distinct risk measures are intimately related, and that which one is appropriate depends merely on the time period over which the risk is calculated. We show, ultimately by application of the Central Limit Theorem, that if we merely sufficiently alter the time period, at some point the need for one measure will transition into the need for the other, without any change in the underlying physical system.

This leads to a comprehensive risk measure that defaults to either the MEL‐risk measure, or standard‐deviation measure, depending not on the physical system, but merely on the time period over which the risk is calculated.     

论有效资本市场假说及其面临的挑战

长期以来,有效资本市场假说一直是许多金融理论的前提,但随着资本市场的发展与完善,人们越来越清楚地认识到有效资本市场假说存在很多的局限性。文章以有效资本市场假说的假设为出发点,从行为金融学和分形市场理论两方面对有效资本市场假说提出质疑,为研究资本市场提供一种新的思维和视觉。     

我国煤炭价格影响因素实证研究

我国煤炭价格的影响因素一直存在认识上的模糊性和不确定性。文章基于近年来煤炭价格影响因素的现实性数据进行实证性的研究,揭示了下游产品需求量、国际煤炭市场价格、煤炭年产量、铁路运力、煤炭储存量等五个因素是目前影响我国煤炭价格的主要原因。     

高效率线性RF功放的研究与设计

应用EER(Envelope Elimination and Restoration)线性功放技术和高效率D类音频放大技术，实现了一个高效率线性RF功率放大器。该线性放大器为AM调制，7MHz时效率优于75％。     

广西病险水闸除险加固的必要性和紧迫性

文章阐述了广西水闸基本情况、水闸发挥的效益、水闸的安全状况、病险水闸存在的主要问题以及除险加固的必要性和紧迫性。