煤矿机电设备的安装工艺研究

煤矿机电设备安装是一个比较复杂的过程,在安装过程中,经常出现很多故障问题,从煤矿机电设备调试、运作过程、故障原因方面进行入手解决,本文一开始先研究煤矿机电设备安装时常见的问题及其表现,然后接着论述煤矿机电设备安装时发生故障的原因分析,最后研究煤矿机电设备正确及其故障排除方法。     

浅谈煤矿机电设备安装技术

在对煤矿机电设备进行安装的时候，过程比较的复杂，在实际的安装过程当中，都可能会发生一些故障。在煤矿的建设过程当中，安装煤矿机电设备是一个非常重要的组成部分，机电设备安装质量的好坏以及安装工期的长短，和煤矿企业在投产之后的经济效益有着直接的关系。本文主要就是对煤矿机电设备在安装过程当中常见的故障问题及其原因进行了分析，然后对煤矿机电设备的安装技术进行了介绍。     

机电工程安装施工技术问题及措施研究

本文主要是探究了机电安装工程在噪声谐振、过流危害以及机电设备本身质量上存在的问题.以机电设备的故障问题检修经验作为依据,查找机电设备在安装施工技术上存在的不足以及危害.最后根据发现的机电设备故障原因,分别提出了机电降噪抑制振捣的措施、加装继电保护装置与安装前对机电设备进行质量检查,解决了机电设备安装施工的三类主要技术问...     

浅谈大口井大功率潜水电泵的安装使用注意事项

大功率潜水电泵在大口井水源安装使用，安装过程中要求相对较高，容易出现故障，影响使用。     

煤矿机电设备安装技术分析

机电设备安装是煤矿基本建设中的一个重要组成部分,其安装质量的优劣,安装工期的长短,与煤矿投产的经济效益息息相关。设备安装中的施工技术非常重要。本文主要介绍了煤矿机电设备安装的技术措施以及质量控制措施,并对煤矿机电设备中常见的故障进行总结、分析。     

高压电动机振动异常极其解决措施分析

高压电动机在生产中应用极其广泛,根据安装运行维护管理规定必须进行定期检查,以便及时了解和掌握电动机的运行情况,及时采取有效措施,保障电动机的安全运行.根据电动机的安装、运行、维护管理经验,分析总结高压电动机在安装、运行中出现振动故障的查找和处理方法.笔者根据自己多年的工作经验,仅对高压电动机常见振动故障查找及处理方法的分析,为实际工作中,准确、可靠找出故障原因,提出较完善的处理方法,确保电动机的安全运行.     

135MW汽轮发电机定子接地故障的检查与处理

文章介绍了广西田东电厂的135MW发电机定子绕组接地故障事件的检查和处理过程,并对故障原因进行分析,确认发电机安装制造工艺不良是造成此次定子接地故障的根本原因,并提出相应的防范措施。     

火电厂热工仪表自动化探析

本文论述了火力发电厂热工仪表自动化的安装与运行,并详细的分析了现场热工仪表故障和测量参数仪表故障,希望能给业内人士提供理论依据和帮助.     

135MW汽轮发电机定子接地故障的检查与处理

文章介绍了广西田东电厂的135MW发电机定子绕组接地故障事件的检查和处理过程,并对故障原因进行分析,确认发电机安装制造工艺不良是造成此次定子接地故障的根本原因,并提出相应的防范措施。     

装表接电中的隐患问题及处理经验

随着电力系统改造,电能表安装以及故障处理作为电力改造中非常重要的环节。装表接电中存在着一些隐患问题,必须在安装和后期维护期间进行及时处理,避免用户在使用过程中出现不安全问题。文章针对装表接电隐患问题以及处理经验进行分析,以期为相关故障处理提供参考和建议。     

Preference Reversal

Preference reversal concerns a systematic divergence between prices of lotteries and subjects' expressed preferences for playing the respective lotteries. This article surveys the discovery of preference reversal by psychologists, its re–examination and corroboration both by psychologists and later on by (first sceptical) economists, as well as the causes of preference reversal. The preference reversal phenomenon has been explained to be caused by four determinants, viz. by the mode of elicitation of certainty equivalents, by intransitivity of preferences, by overpricing and/or underpricing of lotteries, and by nonlinear probabilities. JEL classification: D81     

金银花挥发油提取工艺研究

目的:采用蒸馏法提取,比较提取金银花中的挥发油,筛选出金银花中挥发油最佳提取方法。方法:取金银花进行加工处理,采用共水蒸馏法和通水蒸气蒸馏法提取其中的挥发油。结果:以芳樟醇为考察指标,结果显示,经盐加工处理后的金银花采用以上2种蒸馏法能提出淡黄色芳香的挥发油,较未经加工处理的金银花提取的芳樟醇含量多。结论:在提取金银花中挥发油的过程中,应经盐加工处理后再进行共水蒸馏提取。     

硫酸锰溶液净化工艺研究

以工业硫酸锰固体配制成的硫酸锰溶液净化工艺,关键在于采用硫酸铁除钾、钠和以氟化锰除钙、镁两部分,文章探讨采用独特的除杂剂多步净化以制得锂离子电池正极材料用高纯硫酸锰的新工艺。结果表明,硫酸锰溶液采用硫酸铁作为钾、纳净化剂和使用氟化锰去除钙、镁杂质效果显著,结合水解沉淀除铁和硫化钡除重金属,不但得到了纯度较高的硫酸锰产品,而且产品质量最终也达到了电池材料用高纯硫酸锰的标准。     

The Role of the Business Press in Creating and Disseminating Information around Earnings Announcements

This paper investigates the role of the business press in creating and disseminating information around earnings announcements by examining different motivations of trading volume. We find that press coverage is positively associated with trading activity motivated by differential interpretation and by differential belief revision, consistent with the press playing both an information creation and information dissemination role around earnings announcements. When we divide press coverage into full articles with additional editorial content and news flashes merely repeating verbatim of firm-disclosed press releases, we find that trading volume motivated by both differential interpretation and differential belief revision increases as coverage by full articles increases, and trading volume motivated by differential belief revision increases as coverage by news flashes increases. We also report that the differential interpretation effect of full articles is more pronounced when information users’ sophistication is high. Overall, we provide new evidence to the literature by showing that each type of press coverage plays an informational role in different motivations of trading activity.     

Simple fair division of a square

Suppose we are given a cake represented by the unit interval to be divided among agents evaluating the pieces of the cake by nonatomic probability measures. It is known that we can divide the unit interval into contiguous and connected pieces and assign them to the agents in such a way that the values of the pieces are equal according to the individual agents measures. Such division is said to be equitable and simple. In this paper we show that an equitable and simple division also exists in the case of dividing two-dimensional cake represented by the unit square. In this case, by simple division we mean dividing the unit square firstly by horizontal cuts, and then partition the resulting rectangles by vertical cuts. We give a method of obtaining a proportional and simple division of this cake. Furthermore, we prove the existence of proportional, equitable and simple division.     

基于聚类分析的数据挖掘方法在CRM中的应用研究

客户关系管理是一项营销策略,透过选择和管理客户达到最大的长期价值。它按照客户细分情况有效地组织企业资源,培养以客户为中心的经营行为以及实施以客户为中心的业务流程,以此为手段来提高企业的获利能力、收入以及客户满意度。文章介绍了用挖掘理论对企业CRM进行效能分析,通过表属性的数据收集,用矩阵分析法和最大树法对表象数据进行聚类筛选,取得了较为满意的效果。     

高职应用写作课程行业岗位化教学理念

高职应用写作课程行业岗位化教学模式是一种＂以就业为导向,以增强行业岗位应用写作能力为目标,以行业岗位化应用写作基地为载体,以学校、行业联合办学为组织形式＂的高职应用写作教学新模式,能为社会培养所需的＂零距离＂上岗的应用写作人才。     

A PROGRESS REPORT ON MARXIAN ECONOMIC THEORY: ON THE CONTROVERSIES IN EXPLOITATION THEORY SINCE OKISHIO ()

This report explores the development of exploitation theory in mathematical Marxian economics by reviewing the main controversies surrounding the proper definition of exploitation since the contribution of Okishio. The report first examines the debates on the Fundamental Marxian Theorem and Class-Exploitation Correspondence Principle, developed mainly in the 1970s and 1980s, followed by the property relation theory of exploitation by Roemer. Then, the more recent exploitation theory proposed by Vrousalis and Wright is introduced. Finally, the report introduces and comments on recent axiomatic studies of exploitation by focusing on the work of Veneziani and Yoshihara.     

Classification systems and selection systems: The risks of radical innovation and category spanning

This paper looks at the relations between classification and competition, using the theoretical framework of selection system theory. In a particular competitive arena more than one classification system can be in use. The proportion of classification systems in use by consumers that are also in use by the dominant selectors is a determinant of the risks of category spanning and radical innovation. Furthermore, these risks can be better understood by taking into account whether the selection system has different stages occupied by selectors of different types and by looking at the relations between the selectors of the primary market and the selectors of these selectors.     

北京市人地关系现状及预测——基于生态足迹和GM模型的分析

采用改进过的生态足迹模型对北京市的人地关系现状进行了分析,并应用GM(1,1)模型对其耕地面积和人口数量的未来变动趋势进行了预测。结果表明,北京市近十年来耕地生态足迹逐年增加,其中区域耕地生态足迹的变化幅度比人均耕地生态足迹的变化幅度大;耕地生态承载力逐年降低,其中人均耕地生态承载力的降幅较区域耕地生态承载力的降幅更加明显。耕地生态足迹与耕地承载力异向变化,加剧了生态赤字逐年加大的幅度。在此基础上提出了控制人口规模、提高耕地产出能力及保持耕地产品地区间流动性等措施。