建新矿采空区自然发火测温实践

通过介绍测温法在建新矿自然发火规律研究中的实践运用,进一步摸索采煤工作面推进过程中采空区后方的温度变化规律,为矿井采取有效的防自然发火措施提供科学依据.     

砌筑砂浆达不到设计要求的事故原因分析

从砂浆的配合比、和易性、原材料等对砌筑砂浆达不到设计要求的事故原因进行了分析。     

空气井测井响应现象分析与探讨

空气钻井作为一种新的钻井技术已在四川油田川东地区的zbl井首次投入使用。2003年2月1日，四川测井公司数控分公司对该井进行了测井施工作业，采集了合格的井径、自然伽马、补偿声波、补偿中子、补偿密度和深浅双侧向资料。针对空气井测井中出现的现象进行了分析与探讨，旨在为今后空气井测井系列的选择与解释奠定基础。     

火灾早期过程特征的红外光谱探测和诊断

提出用CO作为早期火灾探测的观察对象,利用红外光谱法进行气体探测,并在此基础上建立了基于FTIR的试验系统.通过该方法成功获得CO的浓度值.并用时间序列分析方法建立二阶自回归模型,提取出特征参数进行分析,能在较短时间内将真假火灾区分开来.     

变频器的常见故障分析

本文阐述了变频器的常见故障，并针对常见故障提出了解决措施。     

A physically based method for triangulated surface flattening

This paper introduces a new method of generating 2D flat patterns from a 3D triangulated surface by opening the bending configuration of each winged triangle pair. The flattening can be divided into four steps. First, a 3D triangulated surface is modeled with a mass-spring system that simulates the surface deformation during the flattening. Second, an unwrapping force field is built to drive the mass-spring system to a developable configuration through the numerical integration. Third, a velocity redistribution procedure is initiated to average velocity variances among the particles. Finally, the mass-spring system is forced to collide with a plane, and the final 2D pattern is generated after all the winged triangle pairs are spread onto the colliding plane. To retain the size and area of the original 3D surface, a strain control mechanism is introduced to keep the springs from over-elongation or over-shrinkage at each time step.     

二元复合驱阶段见效特征

针对孤东油田油藏条件，通过室内试验研究，确定了以胜利石油磺酸盐为活性剂主剂和聚合物的二元复合驱油体系，通过两者之间的协同效应，增加水驱波及体积和洗油效率。该体系在孤东油田七区西馆上54—61层进行试验，取得了较好的阶段性降水增油效果。本文分析了复合驱见效特征和影响见效因素，为下步跟踪分析调整具有指导意义。     

烯烃聚合工业用有机过氧化物危险性分析及对策研究

有机过氧化物是烯烃聚合工业中重要的引发剂。针对烯烃聚合工业用有机过氧化物自分解温度低、易发生反应失控引发火灾爆炸等情况,简要叙述了有机过氧化物的结构、分类、化学性质以及反应特性,重点对其储存、使用、管理等过程中的危险性进行了分析。提出过氧化物储存、运输、使用、报废等方面的风险消减与事故预防措施。     

Optimum thermoeconomic and thermodynamic performance characteristics of an irreversible three-heat-source heat pump

The coefficient of performance and specific heating load of an irreversible three-heat-source heat pump are given by using a general cycle model affected by the finite-rate heat transfer, heat leak and internal irreversibility of the cyclic working fluid. The heat pumping load divided by the total cost per unit time is taken as a new objective function and used to investigate the performance of the heat pump. The thermoeconomic and thermodynamic performance characteristics of the heat pump are discussed in detail. Some important performance parameters such as the thermoeconomic objective function and coefficient of performance are optimized. The optimally operating regions of the heat pump and the bounds of several performance parameters are determined. Finally, it is pointed out that the Carnot heat pump may be taken as a special case of a three-heat-source heat pump and consequently its optimal performance can be directly derived from the results obtained here.     

Effect of fiber types on relevant properties of porous asphalt

The research was conducted to evaluate the effects of cellulose and polyester fibers on the properties of porous asphalt mixes, using the tests of draindown, abrasion, volumetric properties, rutting, and moisture damage. Images of scanning electron microscopy and X-ray computerized tomography were adopted to identify the microstructure of the fiber and inner stone skeleton of porous asphalt. The influence of rutting parameter （G＊/sin δ） of asphalt modified by different fibers on the rutting resistance of the mixes was investigated. Based upon MOHR-COULOMB theory, the cohesion and the angle of internal friction of the mixes were derived from both indirect tension and unconfined compression strength. The experimental results indicate that fibers mainly stabilize asphalt binder and thicken asphalt film around aggregates. Furthermore, they result in the improved mechanical strength of porous asphalt mixes at high temperature slightly. From comparison analysis, cellulose fibers appear to perform better than polyester fibers in porous asphalt mixes.