用废旧EPS制备建筑涂料的实验研究

介绍了目前废旧塑料处理的现状,提出了以废旧聚苯乙烯泡沫塑料(EPS)为基料,选择合适的溶剂、添加剂和颜料制取涂料的配方,通过实验得出涂料的配方为基料23%,溶剂48%,添加剂12%,颜料17%,并对此涂料的各组份进行了分析。经过试验测试,此涂料黏结力强,并且具有干燥快、耐水性、耐酸碱性、耐油性、柔韧性好等特点。此涂料使用方便,生产工艺简单,用途也较广泛。最后从成本和效益方面阐述了此技术的可行性。     

The Computer Paint Program

Abstract

The goal of this research was to explore the relationship between the use of a computer paint program to create visual images and the subsequent verbal expression of these illustrations. First- and fourth-grade children created visual stories using either traditional media or a computer paint program and subsequently word-processed a verbal representation of their stories. Analyses indicated that the paint program visuals illustrated greater creative strength and the accompanying written stories were richer in detail. Additionally, the creative process varied across the two groups in that the students who used the paint program engaged in more peer collaboration, were more likely to experiment with media effects, and made more revisions in both their visual and written products.     

Green-copper containing waxy paint on two Egyptian polychrome artifacts: A technical study

A green waxy paint was found on some fragments of jars at the Metropolitan Museum of Art made of Egyptian alabaster and dated to the Nineteenth Dynasty (1292–1182 BC). Four different types of particles were seen in these paints: green, blue, red-brown, and semi-transparent. The blue particles were identified as Egyptian blue. The green particles present problems as it is still not certain whether they are an original green or an altered blue particle. X-ray fluorescence revealed that copper is the main element in the green waxy paint. Fourier transform infrared spectroscopy (FTIR) found that an extra peak formed at 1588 cm^?1 which correlates to organo-copper salts. Gas chromatography-mass spectrometry analysis confirmed that the binding medium of the waxy paint is aged beeswax. Laboratory experiments showed that heating beeswax with malachite, chrysocolla, verdigris, and copper acetate, as well as heating beeswax in a copper crucible, generate the diagnostic 1587–1588 cm^?1 peak in the FTIR spectrum, which is also found in ancient samples. Chrysocolla, malachite, and altered Egyptian blue/green are the possible candidates for the green particle.     

天线掉漆原因分析及解决措施

针对某产品在高低温贮存过程中出现个别发射天线大面积掉漆现象,通过比较不同工艺方法制备的样件,在温度储存、温度循环试验、漆膜附着力测试情况下是否满足要求,从而查找出该发射天线大面积掉漆的原因。