回收轮胎粉反应增韧PVC性能的研究

将甲基丙烯酸缩水甘油酯(GMA)、丙烯酸(AA)、马来酸酐(MAH)3种不同单体分别通过开炼机剪切加入废旧轮胎粉(GRT)后与聚氯乙烯(PVC)直接反应挤出,制备了3种PVC/GRT复合材料。利用万能电子试验机测定了材料的力学性能,实验结果表明:3种不同单体修饰的GRT/PVC复合材料中PVC/GRTg-GMA复合材料韧性提高显著,在GRT用量为5 phr,GMA、St、DCP用量分别为4、4、0.15 phr时,PVC/GRT复合材料缺口冲击强度提高25.6%。扫描电镜结果显示GMA的加入改善了界面相容性。     

基于CPAC运动控制卡的AGV控制系统开发

介绍了一种基于CPAC运动控制器的AGV控制系统.构建了以CPAC为核心的AGV控制系统硬件结构.采用了GCSP/GRT作为CPAC的编程环境及实时内核,并且GCSP编程环境完全遵从IEC61131-3国际标准.仿真和实验结果表明:使用CPAC和GCSP/GRT作为AGV的控制核心进行的软硬件设计能够满足自动导引zF的...     

橡胶再生剂与相容剂并用在废轮胎胶粉增韧废PP复合材料中的应用研究

进行了橡胶再生剂与相容剂并用在废轮胎胶粉(GRT)增韧废PP复合材料中的应用研究.结果表明,采用橡胶再生剂De-link/相容剂CA并用改性GRT/废PP复合材料的冲击强度可达22.6KJ@m-2,比简单GRT/废PP共混体系提高了2.4倍,比废PP体系提高了2倍;拉伸强度则比简单GRT/废PP共混体系提高了30%,为废PP体系的87%;再生剂通过改变胶粉的交联度来提高复合材料的韧性,相容剂主要通过改善界面性能和提高相容性来提高复合材料的力学性能.     

废旧轮胎胶粉再生改性的研究进展

概述了国内外废旧轮胎胶粉的综合利用情况及其再生改性的方法,主要介绍了化学再生、机械力化学再生方法及进展,重点分析了化学再生助剂、De-link再生剂和RRM再生剂的再生机理,并对它们的再生效果进行了系统评述,指出RRM再生剂作为一种天然植物再生剂,无环境污染,具备了可持续发展的优势。最后展望了废旧轮胎胶粉再生改性工艺的发展新方向。     

Guerrillas in the [Urban] Midst: Developing and Using Creative Research Methods—Guerrilla Research Tactics

Abstract

This paper explores what we are calling “Guerrilla Research Tactics” (GRT): research methods that exploit emerging mobile and cloud-based digital technologies. We examine some case studies in the use of this technology to generate research data directly from the physical fabric and the people of the city. We argue that GRT is a new and novel way of engaging public participation in urban, place-based research because it facilitates the co-creation of knowledge, with city inhabitants, “on the fly.” This paper discusses the potential of these new research techniques and what they have to offer researchers operating in the creative disciplines and beyond. This work builds on and extends Gauntlett's “new creative methods” (2007) and contributes to the existing body of literature addressing creative and interactive approaches to data collection.     

Combining non-destructive nuclear techniques to study Roman leaded copper coins from Ilipa (II-I centuries B.C.)

A set of 32 bronze coins (II-I centuries B.C.) from the Roman city of Ilipa Magna (present-day Alcalá del Río, Seville) have been analyzed by means of non-destructive techniques. These coins are classified in different series according to their numismatic characteristics. They are very interesting from the archaeological point of view because a freshwater fish is depicted on the obverse (unusual in Mediterranean Cultures) and a spike on the reverse (also unusual but frequent in the South of the Iberian Peninsula). A comparative study has been made by PIXE (Proton Induced X-ray Emission) and XRF (X-ray Fluorescence) both corrected by GRT (Gamma Ray Transmission) in order to avoid the polishing of the coins. The results show that after the correction with GRT both independent methods give compatible concentrations for all of the coins that can be assumed as the actual bulk compositions [1]. The average concentrations of the different series have been calculated and they could help to classify the series of coins chronologically.     

改性胶粉在废旧苯乙烯类混杂塑料中的应用研究

研究了采用不同方法对精细胶粉(GRT)进行改性,并应用于废旧苯乙烯类混杂塑料(WPS)中,详细讨论了改性精细胶粉的用量对于复合材料体系拉伸强度、冲击强度等力学性能的影响。测试结果表明,对于不同改性方法制备的改性胶粉,均是在WPS中用量为5份时,所得复合材料的综合性能较好。其中,De link再生剂与SBR并用改性胶粉与WPS复合材料的拉伸强度为最高,为基体WPS的88 2%,较之未改性WPS/GRT提高了51 5%;羧基丁苯胶乳、引发剂BPO和偶联剂A 174并用改性胶粉/废旧苯乙烯类混杂塑料的冲击强度最高,比废塑料基体提高了43 3%,比未改性GRT/WPS复合材料提高了2 5倍。扫描电镜测试分析表明,胶粉改性可有效改善其与塑料基体间的界面粘合。     

ADI-FDTD+GRT在波导电路分析中的应用

本文研究时域有限差分法(FDTD)的一种新的时空压缩技术,并应用于波导电路的分析.首先分析了软激励条件下的改进的几何重置技术(GRT),研究了合理选择源面与参考面的放置位置,使GRT不仅减小了吸收边界对计算结果的影响,而且节省了计算空间,还可以精确得到全部散射参量.另外阐述了与交替方向隐式时域有限差分法(ADI-FDTD)相结合,使计算空间和时间同时被压缩,达到节省计算资源的目的.为了衡量ADI-FDTD+GRT算法的计算精度和效率,分析了包含不连续结构的波导作为算例,将其数值计算结果分别与传统FDTD和HFSS作比较,并将端面和参考面不同间距的ADI-FDTD+GRT与传统ADI-FDTD在仿真结果和资源占用方面进行对比,结果表明本文算法是精确和高效的.     

胶粉/聚烯烃类热塑性硫化胶共混材料的研究

研究胶粉/聚烯烃类热塑性硫化胶(TPV)共混材料的力学性能、耐油性、热稳定性、动态力学性能及材料的界面増容,并采用扫描电镜对共混材料的断面微观形貌进行了表征分析。研究结果表明:TPV/胶粉共混材料的力学性能随着胶粉粒径的减小而提高;增容剂PP-g-MAH可有效地改善胶粉与TPV的相容性,提高共混材料的力学性能;同时,胶粉和增容剂的加入增强了TPV的耐油性。     

胶粉再生改性的研究

讨论了“De-Link”和“乙撑胺”两种再生体系对废胶粉再生改性的效果，并且介绍了重油的加入对两种再生体系改性效果的影响。