抑尘剂效果评价指标准确性分析

为提高煤矿安全保障能力和职业健康水平,降低煤尘尘肺病等职业病危害,快速且准确判断不同抑尘剂的抑尘效果,研究煤尘抑制剂的固化层厚度、抗风蚀特性、单轴抗压强度(UCS)、贯穿阻力等常用性能评价指标,通过各评价指标的试验方法、不同影响因素下性能差异分析各评价指标的准确性。分析结果表明:使用固化层厚度、抗风蚀特性、UCS评价指标来判断煤尘抑制效果较差,贯穿阻力能较好地判断煤尘的抑制效果。     

新体制下装备环境适应性试验鉴定的思考

通过分析现行装备环境工程工作与新体制下试验鉴定要求的差距,归纳提出了新体制下装备环境适应性试验鉴定的总体解决思路,明确了全寿命周期装备环境适应性工作项目剪裁方法,以及完整的装备试验鉴定工作项目集,给出了装备环境适应性要求确定原则,以及各阶段、各层级产品环境适应性要求集,为装备面向实战、全过程、全层级、全指标的环境适应性试验鉴定提供了指导。     

多因素影响下巷道变形特性数值模拟研究

基于FLAC3D有限差分软件对开挖深度、侧压力系数、断面形状等多因素影响下的巷道变形参数进行正交试验，根据正交试验分析结果，分别选取同一深度条件下的圆形、马蹄形、直墙拱形、矩形巷道进行模拟试验并以圆形巷道作为典型断面，对不同深度下的巷道变形特征进行模拟试验。研究结果表明:开挖深度对巷道开挖后的应力差变化影响明显，断面形状对巷道围岩内的塑性区深度和具有显著影响；巷道开挖后的塑性区深度和随形状指数增加而呈线性增长趋势，圆形巷道的塑性区深度和最小，矩形最大；应力差随着巷道开挖深度的增加呈线性增加，深部开采应重视巷道内的应力分布情况。     

Emissions of volatile hydrocarbons from floating roof tanks and their local dispersion: Considerations for normal operation and in case of damage

This work investigates the release and dispersion of volatile organic hydrocarbons, which may escape from external floating roof tanks (EFRT) during normal operation or in case of damage. The dispersion will be described using CFD simulations in close range of the EFRT where hazardous areas are assigned. The aim of this work is to investigate which events can lead to emissions in dangerous quantities and to estimate the corresponding likelihood with regard to explosion protection. An emission in hazardous amount is present if the lower explosion limit has been exceeded and if the extent of this emission is not too low. It is discussed in particular whether the used zoning of potentially explosive areas is conservative or over-conservative.     

AQUIFER PARAMETERS FROM CONSTANT DRAWDOWN NONSTEADY-LEAKY TYPE CURVES1

ABSTRACT: A drain function and set of type curves were defined for the mathematical solution that represents one-dimensional flow under nonsteady conditions in a leaky aquifer for the constant drawdown boundary condition. A match point procedure was developed for determining the aquifer parameters transmissivity, storage coefficient, and leakance based on the drain function and type curves. Use of the procedure is illustrated by an example that utilizes simulated aquifer drawdowns and flowrate data. The drain function and type curves developed in this investigation include the effects of leakage for the constant drawdown boundary condition, which is not included in the existing drain function and type curve found in the literature. Thus, a new set of type curves was developed that can be used to analyze drawdowns for one-dimensional flow in a leaky aquifer with constant drawdown at a line sink. Applications would include flow to a canal or river, drainage of agricultural lands, and dewatering associated with strip mining operations.     

保护北疆铁路,建设良好的生态环境,促进博州经济发展

保护和改善生态环境,是确保北疆铁路畅通无阻与发展博尔塔拉州国民经济的重要环节,就此,本文根据资料进行了讨论并提出了相应措施。     

Assessing the biodegradation potential of polymers in screening- and long-term test systems

This paper presents a test scheme for assessing the biodegradation potential of polymers, starting with aquatic screening systems (aerobic and anaerobic) and continuing to long-term systems. At the end of the scheme the material has to prove its behavior under the relevant disposal conditions. Aerobic screening was performed mainly under aquatic conditions, but also in soil, using BOD-respirometry. Carbon balances were performed to obtain a better evaluation of the biodegradation potential. Under anaerobic conditions, biodegradation in an aquatic medium was followed by measuring CH₄ and CO₂ production. Polymers not fully degraded in the screening systems were tested in aquarium systems for at least 1 year. Biodegradation was followed by monitoring the DOC released in the water, mass loss, and microbial growth on the samples and in the water as well as via FTIR spectroscopy and SEM pictures. Results are presented for the polymers PHB, PHBV, PCL, Mater-Bi AI05H and ZF03U, and Bioceta. By combining the data from the screening with the aquarium system, a good picture of the degradation behavior of the polymers is obtained.Paper presented at the Bio/Environmentally Degradable Polymer Society—Third National Meeting, June 6–8, 1994, Boston, Massachusetts.     

金刚石钻进规程的实验室模拟及参数校核

金刚石钻进的钻进规程决定了钻进效率和钻头的使用寿命，也决定了钻进的安全性、可靠性和经济效益。因此，选择最佳的钻进规程尤其重要。本文通过智能微钻实验台对金刚石钻进的模拟钻进参数及其变化曲线、参数值，以及对应的钻进速度、进尺变化曲线、参数值进行分析，得到相应岩石条件下的最优钻进规程。     

医药工业专用压力容器--开环反应罐的检测及安全评价

对医药化工合成专用设备－－开环反应罐进行了多年跟踪检测，积累了检测数据，对其安全可靠性进行了探索。     

两个相邻高建筑物周围的风环境

描述研究了建筑物周围人行道高度风速分布特征的风洞模拟实验。结果表明：在一个横风向宽度很大的高大建筑物的迎风面拐角附近，风速增大约１倍；而在建筑物的前方有风速的骤变区，这均形成严重的风环境问题。当用一通道将该建筑物分割成两个相邻建筑物时，上述两方面的风环境问题得到了有效的改善，且通道宽度与建筑物顺风向尺度之比的优化数值在１８至２４之间