COMPUTER SIMULATION OF VENTILATION PRESSURE BALANCING FOR THE PREVENTION OF SPONTANEOUS COMBUSTION IN MINES

Qualitative analysis plus trial and error method are still the routine to achieve ventilation pressure balancing. These methods may cause large errors in pressure balancing so that sometimes the spontaneous combustion can not be extnguished effectively. This paper introduces a quantitative analysis of pressure balancing for different causes of ventilation networks and develops a computer program (SPFPB) specifically written for pressure balancing between faces and connected gobs. It allows a user to choose different methods to meet his various needs and the underground conditions. The different balancing results are compared, and the proper locations and sizes of the control devices are recommended.     

DESIGNS AND APPLICATIONS OF COLLECTORLESS FLOTATION FLOWSHEETS OF SULPHIDE ORES~＋

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DEFINITION AND CONTENTS OF SPATIAL ANALYSIS

GeographicalInformationSystem(GIS).firstputforwardinthe1960s.hasdevelopedover30yearsandmadegreatachievements.AndGISsoftwareofvariouskindshavebeenputintothemarketsuccessively.Butitshouldbenotedthatthesesoftwarearemostlyofdatamanagementsystem,andthatSpatialAnalysis--oneofthemajormotivestopromotethedevelopmentofGIS.hasbeenignoredinthissystem.Asaresult.datamanagementandSpatialAnalysisitself.anditsfundamentalcontentsandmethodshavenotyetbeenwellcollectedandcombined,letaloneitssystemandstructur…     

ASYMPTOTIC ANALYSIS OF WEAKLY NONLINEAR AND FORCED OSCILLATIONS

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SYNTHESIS OF SILICAS-SUPPORTED POLYETHYLENEIMINE AND ITS ADSORPTION PROPERTIES

In this paper,a silicas-supportedpolyethyleneimine resin is synthesized and its adsorption proper-ties are studied.Its selectivity of sorbing heavy metal ion willvary considerablly as the pH value of solution varies.In hy- drochloric acid,the resin only sorbs Au(III).This suggests thatthe resin is applicable to the separation of copper(II)or gold(III).     

STUDY ON FOODIZATION OF FIBROIN AND ITS FUNCTIONALITY

Fibroin consists of 18 kinds of amino acids.According to recent resarch onamino acid and peptide chain.it looks promising to exploit fibroin into an advlancedfuncrtional food. This paper conducted investigations into the effects of some amino scids andtheir oligo- peptides which fibroin consisted mainly of on inhibiting cho1esterol levelin blood,accelerating alcoholic metabolism,promoting secretion of insulion and con-trolling blood sugar value.And experimental results all showed various degrees of ef-ficacy. In addtion,the paper also 1ade an approach to the physical properties of dissolu-ble fibroin power whose preparation was necessary to foodization of silk.     

STUDY OF REAL-TIME EXPERT SYSTEM TOOL FOR INDUSTRIAL FAULT MONITORING AND DIAGNOSIS

From the requirements ot industrial production,an integrated fault monitoring,diagnosis and repairing system is suggested in this paper. This new scheme of fault monitoring and diagnosis system is realized by a master-slave real-time expert system,and a real-time expert system tool for this system is also developed accordingly. As an example of application of this tool,a realtime expert system for fault monitoring and diagnosis on DC mine hoist is developed. Experiments show that this tool possesses better supporting environment,strong knowledge acquisition ability, and convenience for use. The system developed by this tool not only meets the realtime requirement of DC hoist,but also can give correct diagnosis results.     

STRUCTURE AND STABILITY OF MAIN ROOF AFTER ITS FRACTURE

A serics of physical modelings in which a main roof is considered as a Kirchhoff plate supported or clammed by Winkler elastic foundation were performed to simulate the fracturing process of the main roof in longwall mining. Based on these modelings spatial structures of the main roof after its fracture are described, blocks of the fractured main roof are classified and their behaviors are analyzed in this paper. Additionally, two stability indexes of the structures are defined, and the factors affecting stability of the structures with different boundaries and geometric conditions are discussed.     

A NEW FORM OF BRACHIOPODS AND ITS SYSTEMATICAL CLASSIFICATION

In the Summer of 1976,one of the writers,Zhu first discovered twospecimens of the wonderful fossils from Lungtan Coal-series in the south partof Huayinshan,east Sichuan.After a year,He Xilin also found another eightspecimens belonging to the wonderful fossils from the same horizon inYangqiao,Luchun and Hongtang,Yichun District,Central Jiangxi Province.     

Locating method of fire source for spontaneous combustion of sulfide ores

In order to achieve a more efficient way to accurately detect the position of the fire source of spontaneous combustion underground mine,a simple fire source locating method,based on infrared scanning system which can determine the point where the highest temperature on the surface of igniting ores occurs,was proposed.First,the differential equations that describe heat flow in ore body were presented and the relationship between the surface temperature distribution and the depth and intensity of inner fire ...     

Spontaneous combustion tendency of fresh and pre-oxidized sulfide ores简

Three representative sulfide ore samples were collected from typical metal mines,and their corresponding pre-oxidized products were obtained under nature environment.The thermal behaviors of each sample at heating rates of 5,10,15 and 20 °C/min in air flow from ambient temperature to 800 °C were studied by simultaneous thermal analysis and the TG/DSC curves before and after the pre-oxidation were compared.By the peak temperature of DTG curves,the whole reaction process for each sample was divided into different stages,and the apparent activation energies were calculated by the Ozawa-Flynn-Wall method.The results show that the reaction process of each sample after pre-oxidation is more complex,with quicker reaction rates,fewer heat production quantities,and higher or lower ignition-points.The apparent activation energies decrease from 364.017-474.228 kJ/mol to 244.523- 333.161 kJ/mol.Therefore,sulfide ores are more susceptible to spontaneous combustion after the pre-oxidation.     

门座式起重机臂架折断故障树分析与对策

针对门座式起重机折臂事故时有发生的问题,以门机折臂事故为顶事件建立故障树,并对其进行定性分析和定量分析,得到故障树各底事件的结构重要度、概率重要度,最后计算出各底事件的临界重要度.结果显示门机臂架折断的主要风险源为焊缝开裂、长期交变载荷以及设计制造缺陷等,提出严禁超载、定期检验以及严格按照设计要求制造等预防门座式起重机臂架折断故障的对策.     

自燃煤矸石山爆炸的危害及治理技术

自燃煤矸石山濒发爆炸事故,会造成大量的人员伤亡和经济损失,从而极大地影响煤炭企业的快速发展.结合某矸石山爆炸的实际情况,分析诱发自燃煤矸石山爆炸的主要因素,指出其爆炸所产生高压、高温热浪、粉尘、冲击波等对周围环境的危害,提出自燃煤矸石山爆炸的防治措施,对促使煤炭企业意识到矸石山爆炸的危害并主动预防矸石山爆炸具有重要的现实意义.     

一种适合于ISMS建设的风险评估方法

风险评估是建设信息安全管理体系(ISMS)的重要环节。本文从ISO17799标准和等级保护的要求出发,设计了一种适合于ISMS体系建设的风险评估方法。该评估方法采取故障树和基线评估相结合的方式,对组织的安全管理状况进行了全面、科学的评价。该方法被应用在国信办ISMS试点项目中,并取得了很好的效果,从而验证了该方法的科学性和可行性。     

故障树分析软件研究

介绍了故障树分析软件系统（fault tree analysis software system,简称FATS）的总体结构、功能及其实现,FTAS以图形方式建立故障树,供用户选择,通过对FTAS作定性分析得系统的最小割集,用定量分析得失效率、基本事件的三个重要度,FTAS可考虑多因素影响;它可处理各种类型的故障树,而且运行速度快。     

基于事故树分析的车辆安全状态模糊综合评价模型

为分析车辆运行状态对行车安全的影响,提出了基于事故树分析的车辆安全状态模糊综合评价方法。在系统分析车辆安全状态影响因素的基础上,构建了车辆安全状态事故树,通过计算事故树基本事件的结构重要度明确车辆安全状态的主要影响因素。根据车辆安全状态事故树分析结果,选取车载质量、车速、横向安全车距等9个因素作为车辆安全状态评价的主要关联因子,基于模糊评判理论构建了车辆安全状态模糊综合评价模型。在CA1046L2轻型载货汽车上安装车辆监测预警系统,系统自动采集车辆行驶过程中的运行状态参数,采用预设故障的试验方法进行了道路试验,利用评价模型对车辆的安全状态进行分析评价。试验结果表明,该模型应用于车辆安全状态评价具有较高的适用性。     

基于模糊故障树的城市燃气输配系统安全评估

将城市燃气输配系统划分为储配站、输配管网和用户三部分,在对城市燃气输配系统某一部分故障分析的基础上,建立了城市燃气输配系统的故障树模型。针对系统的事件发生概率不确定情况,将模糊数学引入到故障树方法,给出了燃气输配系统的模糊故障树安全评估方法。研究表明,该方法用于输配系统的安全评估是行之有效的。     

基于模糊故障树分析法的装载机液压系统故障诊断系统

在故障树分析法的基础上,建立了ZL50G装载机工作液压系统故障树模型,编写了专家系统规则库,确定了优选搜索策略,设计了由知识库和推理机构成的故障诊断模块,并建立起完整的液压故障诊断系统。利用嵌入式技术将该系统在临工ZL50G装载机上进行了实际应用,结果表明:该系统使用简单方便,性能稳定可靠。经过相关改造,该系统也可以在其他相关产品中应用。     

煤炭自燃标志性气体预测指标的实验研究

设计并研制了氧化热解实验模拟装置，通过对峰峰矿区小屯矿工作面采空区煤样的氧化热解模拟实验，绘制了各氧化热解气体CO2、O2、C2H6和CO等气体浓度随温度的变化曲线，并对其分析找出了该矿采空区煤炭自燃的标志性气体预测指标，从而为掌握工作面采空区煤炭自燃的规律和制定有效合理的煤炭自燃发火的防治措施提供依据，为煤矿的高效生产提供安全保障。