旧外墙面维修涂装技术

详细分析了建筑旧外墙面存在开裂、渗漏水、污损等问题的原因。并提出如何对旧墙面进行维修和涂装翻新的处理技术。     

ZW多产品间歇过程调度及在线调整

针对多产品间歇过程调度提出了分层递阶的Petri网建模方法，利用赋时Petri和Petri网的简化技术描述不同层次的生产问题，具有很强的模型描述能力。另外，在调度决策层可以方便地集成优化策略和在线调整算法，使问题求解更加灵活。     

碳化二亚胺的制备及其水解稳定作用

简要介绍了可用于水解稳定剂的碳化二亚胺的性质、制备和在聚氨酯、聚酯树脂中的应用。     

Chemical reactions,thermal and mechanical properties of epoxy — Polycarbonate blends cured with aromatic amines

Bisphenol-A polycarbonate (PC) has been incorporated into epoxy resin cured with 4,4-diaminodiphenyl sulphone (DDS) and 4,4'-diaminodiphenyl methane (DDM). IR spectra reveal that transesterification and transamidation occur between the carbonate group of PC and the hydroxyl group of cured epoxy resin for the DDM-cured system, and that only transesterification occurs for the DDS-cured system. Scanning electron micrographs (SEM) show no evidence of phase separation in these cured systems, which is an indication of full miscibility between the bisphenol-A monomers and PC-oligomers with the copolymer network. The mechanical strength and glass transition temperature (T_g) fluctuate with PC content, whereas the flexural modulus shows a steadily increasing tendency.     

Microstructural Evidence for Diffusion-Driven Tetragonal-to-Orthorhombic Phase Transformation in Y-Ba-Cu-O Superconductor

Microstructures of Y-Ba-Cu-O superconductor were observed using a polarized microscope. Orthorhombic and tetragonal phases were easily distinguished by the optical etching with cross-polarized light. In the specimen cooled rapidly in oxygen, it was possible to see the path of oxygen diffusion by observing the variation of the twin concentration. At the boundary between transformed and untransformed materials, evidence for diffusion-driven transformation could be clearly seen.     

A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 1. The basic characteristics of HCCI combustion

This article investigates the basic combustion parameters including start of the ignition timing, burn duration, cycle-to-cycle variation, and carbon monoxide (CO), unburned hydrocarbon (UHC), and nitric oxide (NO_x) emissions of homogeneous charge compression ignition (HCCI) engines fueled with primary reference fuels (PRFs) and their mixtures. Two primary reference fuels, n-heptane and iso-octane, and their blends with RON25, RON50, RON75, and RON90 were evaluated. The experimental results show that, in the first-stage combustion, the start of ignition retards, the maximum heat release rate decreases, and the pressure rising and the temperature rising during the first-stage combustion decrease with the increase of the research octane number (RON). Furthermore, the cumulative heat release in the first-stage combustion is strongly dependent on the concentration of n-heptane in the mixture. The start of ignition of the second-stage combustion is linear with the start of ignition of the first-stage. The combustion duration of the second-stage combustion decreases with the increase of the equivalence ration and the decrease of the octane number. The cycle-to-cycle variation improved with the decrease of the octane number.     

接枝淀粉共聚物的合成与应用

介绍了接枝淀粉共聚物的合成方法及应用领域，回顾了我国近年来在该领域所取得的可喜进展。     

环保吸声材料的发展动态及展望

分析了吸声材料的吸声原理，介绍了它的发类、基本特点、用途及其研究发展情况。并介绍了很有发展有环保新材料。     

新溶剂体系对SBS生产工艺的影响

讨论了一种新溶剂体系对热塑性弹性体SBS工业生产工艺条件的影响，并与原应用纯环己烷溶剂的生产工艺进行比较。工业试生产结果表明，对SBS生产中溶剂精制工艺过程，应用新溶剂体系时精制塔系的气相压力增大，塔温降低，聚合反应单体质量分数在l8．0％～20．0％时对聚合反应与凝聚工艺控制没有影响，可较显著地提高装置生产能力，降低产品生产成本，同时其凝固点较低，有利于提高SBS生产体系对季节与地域的适应能力。     

工程造价管理改革刍议

工程造价管理改革就是改革现行的定额、费率和价格，定额从指令性变为参考性，费率自主确定，价格市场化；推行监理制，采用FIDIC的合同管理方法和工程量表的做法。