抗冲击改性剂ACR增韧聚氯乙烯的机理

利用机械共混的方法，在双辊塑炼机和平板硫化机上于185℃下制备PVC／ACR抗冲击改性共混物。按照GB1040-79制备标准缺口冲击样条并进行冲击性能测试，在扫描电子显微镜上进行冲击样条的内部结构分析。结果表明，以韧性方式断裂的共混物会产生明显的应力白化区，且区内ACR粒子呈现出严重的空洞化形变，因此空洞化诱导聚氯乙烯塑料基体发生剪切屈服是ACR增韧聚氯乙烯的机理。     

PVC—U塑料门窗型材抗冲改性剂应用

通过对氯化聚乙烯（CPE）和聚丙烯酸酯（ACR）抗冲改性剂的性能及其抗冲机理的分析，对目前国内塑料门窗使用的抗冲改性剂提出了一些建议。     

高抗冲PVC树脂的研制

将ACR乳液应用于VC悬浮聚合中合成了具有核一壳结构的新型PVC树脂,从而改善了PVC树脂的冲击性能及流动性能,探讨了该树脂的结构,并将其与共混改性PVC树脂进行了比较,结果表明：高抗冲PVC树脂中的ACR能与PVC分子形成纳米级混合,从而提高了树脂的韧性,改进了加工性能。     

活化盐泥填充PVC/ACR复合材料在异型材中的应用研究

介绍活化盐泥填充PVC/ACR复合材料在生产异型材中的加工应用情况,探讨了活化盐泥对PVC的稳定机理,通过大量试验确定了最佳配比和生产工艺.与普通异型材相比,活化盐泥填充PVC/ACR物料的加工稳定性得到改善,型材的表面光洁度和力学性能得到提高.     

丙烯酸醋类加工助剂acr影响pvc加工性能的探讨

本文研究了丙烯酸酯类PVC加工助剂ACR的特性黏度、组成对PVC共混物加工性能的影响。结果表明,随着甲基丙烯酸甲酯用量的下降和丙烯酸丁酯用量的提高,其塑化速度增大,但熔体强度降低,在组成相同的情况下,特性黏度越大,塑化越慢,熔体强度越大;丙烯酸酯类加工助剂ACR对PVC制品的拉伸强度和维卡软化点无明显影响,高黏度的加工助剂有提高PVC制品拉伸强度和维卡软化点的趋势。     

建筑门窗用聚氯乙烯(PVC)树脂抗冲击改性剂的选择

用纯PVC是不实际的,需要对PVC树脂进行改性。抗冲击改性剂作为PVC树脂重要的改性剂,本文主要论述了三种抗冲击改性剂CPE、EVA、ACR对PVC树脂的影响。     

ACR增韧聚碳酸酯/聚乳酸合金的制备与性能研究

以核壳结构的丙烯酸酯类树脂(ACR)作为增韧剂,对聚碳酸酯(PC/)聚乳(酸PLA)合金进行增韧改性,研究了ACR用量对合金力学性能、热性能和微观形态的影响。结果表明:加入一定用量的ACR,合金的冲击强度大幅度提高,而其他力学性能影响较小;合金比例为PC/PLA=90/10时,二者的相容性良好,体系只有一个玻璃化温度;ACR的用量对合金的微观形态有一定的影响。     

ACR改性CPVC凝胶化测试及力学性能的研究

采用差示扫描量热法(DSC)和HAAKE流变仪研究了不同用量的抗冲型丙烯酸酯橡胶(ACR)改性氯化聚氯乙烯(CPVC)的凝胶化性能及流变性能,综合力学件能、耐热性能、微观形貌对ACR改性CPVC进行系统研究.结果表明,ACR的加入能极大地提高CPVC的凝胶化度,促进塑化,改善CPVC加工性能,ACR用量6～9份为宜,对CPVC的增韧效果较好.     

A human-machine interface evaluation method: A difficulty evaluation method in information searching (DEMIS)

A human-machine interface (HMI) evaluation method, which is named “difficulty evaluation method in information searching (DEMIS)”, is proposed and demonstrated with an experimental study. The DEMIS is based on a human performance model and two measures of attentional-resource effectiveness in monitoring and detection tasks in nuclear power plants (NPPs). Operator competence and HMI design are modeled to be most significant factors to human performance. One of the two effectiveness measures is fixation-to-importance ratio (FIR) which represents attentional resource (eye fixations) spent on an information source compared to importance of the information source. The other measure is selective attention effectiveness (SAE) which incorporates FIRs for all information sources. The underlying principle of the measures is that the information source should be selectively attended to according to its informational importance. In this study, poor performance in information searching tasks is modeled to be coupled with difficulties caused by poor mental models of operators or/and poor HMI design. Human performance in information searching tasks is evaluated by analyzing the FIR and the SAE. Operator mental models are evaluated by a questionnaire-based method. Then difficulties caused by a poor HMI design are evaluated by a focused interview based on the FIR evaluation and then root causes leading to poor performance are identified in a systematic way.     

基于自适应Chirp表达的雷达多目标分辨

针对编队机群目标的低分辨雷达回波多普勒信号的线性调频数学模型,采用先作自适应Chirp信号分解再作维格纳维利分布（WVD）的自适应Chirp表示方法。由于分解所选基函数能够较好匹配雷达回波信号,因而在分析结果中产生的交叉项较少,同时具有较高的时频分辨率和抗噪声能力。采用自适应Chirp表示对实测编队目标的雷达回波信号进行分析,证明了该方法能够有效地实现雷达多目标分辨。