龙开口水电站溢流坝段动力模型破坏试验研究

采用仿真混凝土材料研究了龙开口水电站溢流坝段在不同因素影响下的动力破坏特征,并通过对6个模型试验结果的分析探讨了溢流坝段的动力破坏机理。试验中考虑了坝体-库水的动力相互作用以及横河向地震动对大坝破坏的影响,采用规范谱波和场地谱波两种地震动激励进行模型超载破坏分析。试验结果为工程设计和评价溢流坝段的抗震性能提供依据。     

Assessing the performance of intumescent coatings using bench‐scaled cone calorimeter and finite difference simulations

A method was developed to assess the heat insulation performance of intumescent coatings. The method consists of temperature measurements using the bench‐scaled experimental set‐up of a cone calorimeter and finite difference simulation to calculate the effective thermal conductivity dependent on time/temperature. This simulation procedure was also adapted to the small scale test furnace, in which the standard time–temperature curve is applied to a larger sample and thus which provides results relevant for approval. Investigations on temperature and calculated effective thermal conduction were performed on intumescent coatings in both experimental set‐ups using various coating thicknesses. The results correspond to each other as well as showing the limits of transferability between both fire tests. It is shown that bench‐scaled cone calorimeter tests are a valuable tool for assessing and predicting the performance of intumescent coatings in larger tests relevant for approval. The correlation fails for processes at surface temperatures above 750°C, which are not reached in the cone calorimeter, but are attained in the small scale furnace set‐up. Copyright © 2006 John Wiley & Sons, Ltd.     

β放射性气体浓度计的新分度方法

本文介绍β放射性气体浓度计的一种新的分度方法——泄漏元件排气法。其特点是一只元件可分度放射性气体浓度计的许多读出数(甚至是几个量程),操作方便。     

火烧驱油物理模型的研究及应用

为配合火烧驱油的矿场试验 ,胜利油田有限公司采油工艺研究院研制了火烧驱油物理模型。模型主要由模型本体、注气系统、注水系统、油气分离系统、测量与控制系统 5部分组成。大量的室内和矿场模拟试验表明 ,这种物理模型具有立式和卧式模型两种功能 ,可模拟不同地层条件下湿式和干式火烧驱油试验。分析研究模拟试验数据不仅可加深对火烧驱油机理的认识 ,而且对现场火烧驱油试验具有指导意义     

电火花铣削钛合金电极损耗在线补偿研究

根据电火花铣削等损耗理论，对用电火花铣削钛合金的加工中电极损耗补偿作了分析阐述。并根据正交试验的数据对理论分析结果进行对比，同时给出了一定的结论和建议。     

智能组卷系统试题库结构的研究

在分析了传统的组卷系统的组卷算法及相应的试题库结构的基础上，基于遗传算法提出了一种新的试题库结构，并给定具体结构的确定方法。实践表明，这种结构下的试题库很好地配合遗传算法实现了智能组卷，并且系统效率更高，冗余度更小。     

Analyses of the practical adhesion strengths of the metal/polymer interfaces in electronic packaging

There is a plethora of techniques to measure the adhesion strength of metal/polymer interfaces. However, the practical adhesion strength, which is the work done in separating the film from the substrate (or one film from another), is very sensitive to the test methods and the mechanical effects, such as the residual stress, thickness and mechanical properties of the layers, strain rate, and phase angle. Deriving intrinsic-adhesion properties of the interfaces, which are independent of such parameters, from the practical adhesion-strength measurements is a formidable task. In the present work, data from the three commonly used adhesion tests; pull-out, 90°-peel, and T-peel tests are compared with the intrinsic-adhesion properties of the interface, such as the interface-fracture toughness or the interface-fracture energy, and their implications are discussed. Material systems analyzed were Cu-based lead frame/epoxy-molding compound (EMC) and Cu/Cr/polyimide.     

长庆上古生界气层CO2增能压裂工艺

长庆上古气藏物性差,压力系数低,水锁伤害大,采用常规水力压裂,入井液返排困难,气井产量低。在储层改造地质研究的基础上,通过对CO2泡沫压裂技术进行室内攻关,引进开发了CO2泡沫压裂酸性交联技术,优化了CO2泡沫方案设计及现场施工工艺,配套了CO2增能压裂工艺技术。经过现场应用,充分说明了CO2增能压裂是一项行之有效的工艺技术,对于提高单井产量和长庆气田整体开发水平都是有益的。     

基于PLC电液比例控制的液力测功装置开发及其应用

本文介绍一种齿轮动态加载试验规范及技术要求，论述了运用电液比例控制技术所设计的液压加载系统原理及其使用效果，并简述由此构造的液力测功装置的原理与应用前景。