汽车风挡玻璃用单组分湿固化聚氨酯胶粘剂

简要介绍了汽车风挡玻璃用胶粘剂的发展历史,对汽车风挡玻璃用胶粘剂的要求和单组分湿固化聚氨酯胶粘剂的性能、一般配方。论述了汽车风挡玻璃用单组分湿固化聚氨酯胶粘剂技术进展及发展趋势,并结合国内现状,提出了一些建议。     

玻璃用UV固化胶粘剂的研究与应用

介绍了紫外光固化胶粘剂的基本概念和特点,重点论述了近年来玻璃用uv固化胶粘剂的研究和应用.     

泡沫玻璃专用无机胶粘剂的研制

介绍了泡沫玻璃用、以硅酸盐为主体的无机胶粘剂的配方与性能，阐述了该胶的反应原理，实验过程。     

聚氨酯胶粘剂在汽车驾驶室玻璃装配中的应用

介绍了TOTALSEAL聚氨酯胶粘剂在G系列驾驶室玻璃装配中的应用，说明了驾驶室生产中的驾体、玻璃粘接面涂胶以及填缝等工序使用TOTALSEAL聚氨酯胶粘剂是比较适宜的。     

环氧型水中胶粘剂（2#）

本文介绍了一种能在水中或干燥环境中对金属、混凝土、玻璃或其他刚性材料牢固粘合的环氧型胶粘剂。该胶粘剂水中对钢的常温粘合剪切强度可达28.4～30.4MPa,不均匀扯离强度有29～39kN/m。文中对这种特殊胶粘剂的各种成分和它们的用量选取作了介绍,并测试了该胶粘剂的性能,最后进行了简要讨论。     

配方精选

改性聚苯乙烯胶粘剂,异氰酸酯改性聚苯乙烯胶粘剂,废聚苯乙烯再生胶粘剂,墙地砖用聚苯乙烯胶粘剂,网贴玻璃马赛克胶粘剂,有机聚合物与无机粒子杂化物作面漆,丙烯酸粘合剂制透过皮肤给药的载体,[编者按]     

鞋用胶粘剂

综述了我国鞋用胶粘剂的概况及发展趋势,重点介绍了鞋用聚氨酯(PU)胶粘剂的研制、生产及应用情况。     

电子电气用有机硅胶粘剂

介绍了电子电气用有机硅胶粘剂的基本性能和种类，以及高透明性、导电性、散热性、快干非腐蚀性和芯片焊接用、耐热粘接密封用等有机硅胶粘剂。     

热塑性聚氨酯胶粘剂的研制

介绍用聚酯多元醇，二异氰酸酯，１，４－ＢＳ为主要原料合成热塑性聚酯胶粘剂的合成方法，并考查了聚酯品种和分子量，胶粘剂分子量，异氰酸酯指数，异氰酸酯品种等对胶粘剂粘接，贮存，机械性能的影响。     

玻璃结构用双组分聚氨酯胶粘剂老化性能研究

选取了两种玻璃结构用双组分聚氨酯胶粘剂,通过研究两种胶粘剂在浸水、高温高湿、水-紫外、酸雾、清洁剂等环境模拟条件下拉伸剪切强度随着时间的变化趋势。对两种胶粘剂的综合性能进行评价,为不同玻璃结构部位选胶应用提供一定的参考。     

Model of Cellular Instability of Flames of Ternary Mixtures

A simple phenomenological diffusive-thermal model of cellular instability of premixed flames of ternary mixtures is developed and presented. The model shows that preferential diffusion can alter stoichiometry of the mixture, i.e., the ratio of the fuel and oxidizer concentrations, and also its effective dilution by an inert. Key parameters of the model are estimated using numerical modeling of burning velocities. Laminar burning velocities are calculated for hydrogen-oxygen-nitrogen, methane-oxygen-nitrogen, and propane-oxygen-nitrogen mixtures. Conditions for the appearance of cellular instability in ternary mixtures are determined and compared with experiments. In good agreement with experimental observations, the diffusive-thermal instability is predicted in hydrogen flames with equivalence ratios φ ≲ 1.45, in lean methane flames with φ ≲ 1.02, and in rich propane flames with φ ≳ 1.03. The magnitude of the change in the local flame velocity due to preferential diffusion is evaluated. It is demonstrated that nitrogen diffuses faster than oxygen in hydrogen-air and methane-air flames, while oxygen diffuses faster than nitrogen in flames of propane and other heavier hydrocarbons. In mixtures of air with propane or heavier hydrocarbons, the transition between stable and unstable regimes is predicted in mixtures that are leaner than the mixture corresponding to the peak of the burning velocity curve, in agreement with experimental observations. __________ Translated from Fizika Goreniya i Vzryva, Vol. 41, No. 5, pp. 14–22, September–October, 2005.     

3种肠杆菌科细菌的耐药性变迁

目的研究大肠埃希菌、肺炎克雷伯菌、阴沟肠杆菌的耐药性变迁。方法对2007～2009年临床分离的大肠埃希菌(645株)、肺炎克雷伯菌(260株)和阴沟肠杆菌(150株),采用纸片扩散法进行体外药敏测定,并依据美国临床实验室标准化协会(Clinical and Laboratory Standards Institute,CLSI)规定的标准,分析3种肠杆菌科细菌的耐药性变迁。结果大肠埃希菌、肺炎克雷伯菌、阴沟肠杆菌对氨苄西林的耐药率均较高;对头孢他啶的耐药率低于头孢噻肟;与2007年比较,2008年和2009年对头孢吡肟的耐药率明显增长;未发现对亚胺培南耐药菌株的产生。结论细菌耐药性不断增强已成为临床治疗面临的重要难题,应从耐药监测、医院感染控制、合理使用抗生素等多方面努力,减少细菌耐药性的产生。     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

Analysis of products of high-temperature pyrolysis of various hydrocarbons

Ethane, ethylene, acetylene, propane and neopentane have been pyrolyzed at 1173 K, and methane at 1372 K in a flow system, and the volatile pyrolysis products analyzed. Eleven aromatic hydrocarbons, containing 14 or fewer carbon atoms, accounted for 98 + % of the liquid products recovered in each case. Benzene was the main product, followed by naphthalene. No compounds with branched chains or multiple substituents were present, and compounds containing even numbers of carbons comprised 93–99% of each mixture. Acetylene was a major component of the gaseous effluent from each of the initial hydrocarbons. The effect of temperature on the composition of the gaseous effluent during pyrolysis of methane, ethane and ethylene was determined. Carbon film deposition from methane commenced at about 1273 K; from ethane at 1015 K and from ethylene at 1100 K, in each instance coinciding with the appearance of acetylene in the effluent. As the temperature was raised, at first the increase in the rate of carbon deposition closely followed the increase in the concentration of acetylene in the effluent. It is proposed that acetylene may be a common factor in the pyrolysis of aliphatic hydrocarbons, perhaps acting as the precursor of both surface carbon and aromatic hydrocarbons by a process of head-to-tail linkage of two-carbon units at active surface sites to form chains that then undergo dehydrogenation to carbon or cyclization and desorption as aromatic species.     

142例新生儿溶血病血清学检测结果分析

目的对本地区142名新生儿溶血病患者进行血清学检测,评价直接抗人球蛋白试验、游离抗体试验和抗体释放试验在该病诊断中的价值。方法对2005年1月~2007年6月各医院送检的高胆红素血症新生儿血液标本进行"三项试验"。结果142名新生儿溶血病患者中,血型分布规律为:B>A>AB>O,54.22%为B型,43.66%为A型,二者差异有显著意义。直抗试验阳性率为76.76%,释放试验阳性率为100%,游离试验阳性率为50.70%。释放试验阳性的A型患者中,抗-AB检出率为47.17%,B型患者中的检出率为53.03%,二者差异无显著意义。结论释放试验敏感度最高,是判定新生儿溶血病最有力的证据,在本地区,B型新生儿可能更易患新生儿溶血病。     

阿司匹林系列综合性实验的教学改革

将以往实验教学中分散的、孤立的关于阿司匹林方面的实验加以总结和进一步延伸,使其系列实验内容涉及知识面较广、较深,涵盖的基本技能操作较全面,使之达到培养学生的综合能力、创新能力及提高综合素质的一项综合性实验。     

谈化学教学过程中哲学观点的应用

高职阶段学生的辩证逻辑思维开始占优势，在化学教学过程中贯彻应用哲学观点既有利于学生辩证逻辑思维的开发，又能更好地掌握化学学科的思想精髓。     

环己酮肟制备工艺的优化

对环己酮肟制备过程中环己酮的肟化和无机工艺液的萃取进行了分析,指出了环己酮肟制备过程中存在的问题,提出了解决问题的方法,实施改造后取得了明显的经济效益。     

Synthesis of fine powders of KTP-group compounds of stoichiometric composition

Precipitation of crystalline monophase nanopowders (50-100 nm in diameter) of stoichiometric binary orthophosphates of titanyl and alkaline metal in aqueous solutions has been studied. It has been shown that, in the formation of those powders, titanyl hydrophosphate can be used as a precursor. Rising temperature and alkaline ion concentration in the solution decrease the size of the powder grains, while elongating the exposure of the synthesized solid phase in the suspension increases grain sizes. An effective technique to synthesize fine-dispersed powders of monophase stoichiometric binary orthophosphates of titanyl and alkaline metal has been developed.     

塔设备改造选型的分析

就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后，着重介绍一种新型塔板（导向梯形浮阀塔板）和一种新型填料（波环填料——乾隆帕克）。