Study on characteristics of double surface VOC emissions from dry fiat-plate building materials

This paper sets up an analytic model of double surface emission of volatile organic compound （VOC） from dry, flat-plate building materials. Based on it, the influence of factors including air change rate, loading factor of materials in the room, mass diffusion coefficient, partition coefficient, convective mass transfer coefficient, thickness of materials, asymmetric convective flow and initial VOC concentration distribution in the building material on emission is discussed. The conditions for simplifying double surface emission into single surface emission are also discussed. The model is helpful to assess the double surface VOC emission from flat-plate building materials used in indoor furniture and space partition.     

羟乙基亚胺二乙酸的制备研究

本文对缩合法制备羟乙基亚胺二乙酸的反应温度、反应时间、反应波的pH值和原料配比进行了研究,优选出了较好的反应条件,产率为825％～91.0％。     

有机铵表面修饰型针铁矿萃淋材料萃CrO_4~（2－）研究

利用不同取代基有机按的正电性，对控制等电点条件下合成的针铁矿电负性表面进行修饰负载。采用红外光谱，热分析与扫描电镜研究材料的一些基本物性；考查了材料在以铬酸根为代表的二价阴离子萃取体系中有机铵不同取代基和体系中酸碱性对萃取性能的影响规律及其解释，萃取过程动力学因素。该萃淋材料对ＣｒＯ单级提取率大于百分之九十，萃取速度快，半萃取率所需时间仅１分钟左右。     

钠沸石/银离子玻璃NO2气敏传感器的性能

报道一种新型固态电解质NO2气敏传感器，它以人工钠沸石材料为气敏固态电解质，新型银离子玻璃为气敏辅助性材料，溅射金膜为工作电极，埋藏于银离子玻璃中的银球为参比电极，构成电位型气敏传感器，可在线检测来自工业废气和汽车尾气等污染源的NO2。     

环氧亚麻油增塑剂合成方法的研究

报道了一种以磷酸为催化剂，甲酸、H2O1为原料对亚麻油进行环氧化的新方法。结果表明：用磷酸作催化剂优于树脂，甲酸作过氧化剂优于冰醋酸；反应条件温和，具体操作简便，使反应时间缩短；产物符合环氧亚林油增塑剂标准，环氧值？7．8％，碘值＜10。     

中国宝玉石资源的种类、分布及特点

通过对中国宝玉石资源的高档宝石、中低档宝石、稀少宝石、高档玉石、中低档玉石、有机宝石的种类、分布有产出的分门别类的阐述，认为中国宝石资源具有，高档宝石产量或品级不高，中低档宝石及玉石品种多、分布广，高档玉石软玉品级高，有机定石分布广、产量大的特点。     

光板地与板栗地土壤有机碳对比研究

在长汀河田八十里河流域,以严重侵蚀地种植板栗后的生态系统为研究对象,并以未采取治理措施的严重侵蚀退化形成的“光板地”为对照,分析和讨论了严重侵蚀退化生态系统进行生态治理后土壤的固碳功能和土壤质量的变化。     

OLED矩阵显示屏运动图像的一种实现方法

介绍了实现有机发光二极管 (OL ED)图形显示的一种方法 .通过设计软件 ,实现了无交叉效应、高清晰度的OL ED矩阵运动图像的图形显示     

从菱锌矿氯化浸出液中萃取锌和镉——Ⅱ.胺萃取镉氯络合物

研究了4种大分子量胺从氯化钠或盐酸溶液中萃取镉氯络合物的行为。考察了溶液的酸度、氯离子浓度、稀释剂以及胺浓度对镉萃取率的影响。通过分析饱和有机相(饱和法)和斜率分析法得到镉在N_(1923)和TOA中的革合物形式分别为:(RNH_3)_3[CdCl_5]和(R_3NH)_2[CdCl_4]。     

Evaluation of cement degradation induced by the metabolic products of two fungal strains

Summary During their metabolism, microorganisms can produce acids able to bring about the degradation of cement. Two acid-producing alkalophilic fungal strains have been isolated from soil, a strain ofAspergillus niger which produces gluconic and oxalic acid and ofMycelia sterila which produces gluconic and malic acid. After eleven months of contact the acids produced byAspergillus dissolved portlandite with a low leaching of calcium, increased the cement porosity by 11.4%, and reduced the bending strength by 78%. The second strain is responsible for a significant dissolution of portlandite with a leaching of calcium of 4.2% of the initial content, an increase of the porosity of 11%, and a loss of the bending strength of 62%. Direct contact of mycelia with the cement surface is not necessary for effective dissolution to take place. Low pH and a high temperature favor the the production of acids.