Review of quantitative structure‐activity/property relationship studies of dyes: recent advances and perspectives

Dyes have been applied and are playing an increasingly important role in many industries, including the textile, printing, medical and energy industries. Their wide applications imply that specific dyes possessing given properties need to be effectively designed. The present review aims to survey information related to activity/property research of dyes that has been published in the past two decades. Emphasis is laid particularly on studies based on quantitative structure–activity/property relationships that have contributed to the theoretical design and application of dyes. Finally, the perspectives of quantitative structure‐activity/property relationship studies are set out in order to show how this method may be used to design new dyes and to evaluate their different properties. The challenges facing these studies are also outlined.     

深圳市电镀、印制电路板行业环境风险评价指标体系研究

基于深圳市电镀、印制电路板行业存在的环境问题及环境风险现状,结合国家相关技术指南及导则,提出建立一种电镀、印制电路板行业环境风险评价指标体系,为深圳市试点环境污染责任险制度提供技术支持.     

简易四轮式大型螺旋盘管机的结构介绍

本文对大型螺旋盘管机的原理及构造作一分析介绍,阐明其适用性和使用要求。     

Supercritical CO2 extraction of Plumula nelumbinis oil: Experiments and modeling

Supercritical CO₂ extraction of Plumula nelumbinis oil was investigated at temperatures of 308–338 K and pressures of 15–45 MPa. The yield of the extracted oil was 0.128 g/g material at optimal conditions, in which gamma-sitosterol, unsaturated fatty acids and gamma-tocopherol had higher relative concentrations as determined by GC–MS. The broken and intact cell (BIC) model, with reduced adjustable parameters, was utilized to simulate the SFE process. The values of average absolute relative deviation (AARD) were in the range 2.34–10.9%, indicating that the improved method had a similar effect to the BIC model when three parameters were adjusted. The parameters obtained during the modeling had clear physical meanings and were used to gain an in-depth understanding of the SFE process theoretically.     

低介电（ε〈2）低密度硅灰石陶瓷材料的研制

叙述了几种不同成分的配比对材料强度以及介电常数的影响,并进行了相应的分析。分析结果表明,利用磷酸或聚合磷酸铝结合空心球可研制出ε〈2的介电材料,材料的研制对宽频天线罩电性能的设计有一定的参考价值。     

影响UV固化聚酯型水性聚氨酯-丙烯酸酯涂层性能的因素

选用异佛尔酮二异氰酸酯(IPDI)、聚酯二元醇、二羟甲基丙酸(DMPA)、甲摹丙烯酸-β-羟乙酯(HEMA)等为原料,采用阴离子自乳化法制备了紫外光(UV)固化聚酯型水性聚氨酯-丙烯酸酯预聚体,并配以光引发剂,其涂层经紫外光固化.讨论了光引发剂和n(-NCO):n(-OH)对涂层性能的影响.研究结果表明,复配光引发剂种类及比例为m(光引发剂B):m(光引发剂c)=1:1,用量为HEMA质量分数的10%时,涂层性能最好.     

Friction of a C/SiC Composite Bearing in Air and in Combustion Environments

A bearing used for the load-carrying hinge was manufactured based on a carbon fiber-reinforced silicon carbide matrix (C/SiC) composite with a SiC coating. Chemical vapor infiltration was applied in the process of the composites. Experiments were conducted by an experimental simulation method that would facilitate testing under coupling stress in air and in combustion environments. Modeling analysis deduced the relationship of applied load, normal contact force, and friction force in the hinge bearing. Friction behavior was comparatively investigated up to 10 kN at room temperature in air and at 1800°C in combustion environments. Worn surfaces were observed by scanning electron microscopy, and surface roughness was measured by atomic force microscopy. Reliable thermal load-carrying ability and stable friction performance of the hinge bearing are demonstrated under this testing framework. The oxide products in the combustion environment play an important role in reducing friction by providing a reaction layer to moderate the contact stresses.     

二碘化钐在分子内环化反应中的应用

综述了二碘化钐在分子内环化反应中的应用。     

高品质护环钢40Mn18Cr4的生产技术

采用"30 t电炉熔炼→LF精炼→VD真空处理→浇注"工艺试制高品质40Mn18Cr4护环钢。通过控制钢中C、Si、S、P等元素和合理的真空处理工艺,得到目标成分要求的钢水;通过对浇注系统进行清洁、干燥及浇注后期进行冒口补注等措施,得到合格的钢锭。经过合理的锻造、热处理,其力学性能的各项指标都达到了目标要求。     

电弧炉炼钢碳化硅白渣工艺的脱氧与脱硫

理论计算和实践表明，在电弧炉上采用碳化硅代替硅铁粉和碳粉的白渣还原工艺，可强化钢的脱氧和脱硫效果；提高电炉炼钢生产效率；降低吨钢电耗和生产成本。并指出，采用喷吹技术会进一步改善该工艺的炼钢技术经济效果。