利用废旧聚苯乙烯泡沫塑料制备水乳型纸箱防水涂料

利用废旧聚苯乙烯泡沫塑料制备水乳型纸箱防水涂料的工艺流程，配方组成以及涂料性能的测试方法     

铝合金厚壁圆筒二次机械自紧技术的实验研究

采用铝合金厚壁圆筒进行了二次机械自紧实验研究,获得的结果充分表明,二次机械自紧技术作为降低冲头推力为目的的工艺方法,效果是明显的和有效的,可满足不同口径厚壁筒机械自紧的要求.     

浅析电子废弃物的破碎与分级

采用机械方法处理电子废弃物，分选前的破碎分级作业是实现高质量分离、富集废弃物中有用物质的保证。从破碎对物料的解离作用入手，分别阐述了不同机械分选作业对入料粒度和形状的要求，这对电子废弃物分选前的破碎分级环节有一定的指导意义。     

泡沫-细水雾对变压器油池火的冷却及热辐射阻隔特性研究

泡沫-细水雾在全尺寸变压器灭火实验中展现出高效灭火性能。纯水细水雾具有冷却效果好、热辐射阻隔能力强的特点,但添加泡沫灭火剂后对其冷却及热辐射阻隔特性的影响机制尚不明确。对泡沫-细水雾和纯水细水雾的冷却与热辐射阻隔特性进行了对比实验,并基于雾特性测试结果对相应性能的差异进行了分析。发现添加泡沫灭火剂后能降低水雾的粒径,从而令泡沫-细水雾的冷却和热辐射阻隔性能优于纯水细水雾。此外,泡沫灭火剂中的阻燃物质也是加速火焰熄灭的重要因素。研究结果可为变压器灭火系统选择、泡沫-细水雾系统工况参数优化等方面提供理论指导。     

Mechanical Performance and Design Criteria of Biodegradable Low-tunnel Films

The overall mechanical behaviour of a series of experimental Mater-Bi made thin low-tunnel films is analysed with respect to the effect of two major factors: the film processing optimisation during manufacturing and the design of the low-tunnels structural system. The analysis of the mechanical behaviour of the biodegradable low-tunnel films, based on the results of extensive full-scale and small-scale experiments, combined with laboratory testing of the mechanical properties of the film, proves that a rather good mechanical behaviour is possible for these films, comparable to the behaviour of conventional agricultural films in terms of strength, provided that two criteria are met: (a) the low tunnel structural design is based on the initial stress at yield value of the film, which represents the asymptotic value of the tensile strength of the film, following its evolution with the time of exposure to real field conditions; (b) the processing of the film is optimised for the particular biodegradable material and film thickness under consideration. It is also confirmed that the stabilisation schemes used with conventional polyethylene films are not suitable for the biodegradable films.

电子设备的机械防护设计

机械防护设计是电子设备耐环境设计的重要内容,对提高电子设备的可靠性水平具有现实意义,该文对电子设备的机械防护设计作了一些探讨。     

减缓地表沉降的覆岩离层注浆新技术的研究

较系统地介绍了覆岩离层产生的力学机理 ,分析了适合离层注浆控制地表沉降的地质采矿条件 ,探讨了充填物在离层空间的力学机理及离层充填注浆设备及注浆系统 ,并对离层注浆的应用效果确定了评价指标     

Biodegradable Films Based on Blends of Gelatin and Poly (Vinyl Alcohol): Effect of PVA Type or Concentration on Some Physical Properties of Films

The aim of this work was to develop biodegradable films based on blends of gelatin and poly (vinyl alcohol) (PVA), without a plasticizer. Firstly, the effect of five types of PVA with different degree of hydrolysis (DH) on the physical properties of films elaborated with blends containing 23.1% PVA was studied. One PVA type was then chosen for the study of the effect of the PVA concentration on the mechanical properties, color, opacity, gloss, and water solubility of the films. The five types of PVA studied allowed for films with different characteristics, but with no direct relationship with the DH of the PVA. Therefore, the PVA Celvol^®418 with a DH = 91.8% was chosen for the second part, because they produced films with greater tensile strength. The PVA concentration affected all studied properties of films. These results could be explained by the results of the DSC and FTIR analyses, which showed that some interactions between the gelatin and the PVA occurred depending on the PVA concentration, affecting the crystallinity of the films.     

机电产品可靠性研究与探讨

机电产品越来越广泛地应用于社会各个领域,随着自动化、小型化程度的提高,很多机电产品结构越来越复杂,并且其使用条件也越来越严酷,由此产生的产品可靠性问题必然越来越多,可靠性技术也越来越受到重视。本文针对机电产品,从可靠性管理、可靠性设计和分析、可靠性试验和评定三个方面,对可靠性研究工作进行初步探讨。     

某城市地下车库联络通道的消防安全研究

城市地下车库联络通道作为一种新型的地下交通联络通道,可净化地面交通,提高土地利用率,解决城市交通拥堵问题。然而这种通道兼有地下车库和城市交通隧道的特点,结构复杂,一旦发生火灾,损失较大。其防火设计的难点在于如何定性并选择合适的规范条文,因此有必要系统研究其消防安全问题并提出有效解决方案。以某城市地下车库联络通道为例,研究该通道的火灾危险性,提出防火分隔、探测报警、排烟以及人员安全疏散等消防设计方案和管理对策,并通过数值模拟方法验证了该方案的有效性和可行性。