UV固化水性木器涂料的性能及影响因素分析

木器涂料是用于木器制品表面的起装饰与保护作用的涂料。本文就UV固化水性木器涂料的性能以影响因素进行了分析,通过结合一系列具体的试验研究,详细介绍了试验研究所使用的材料和方法,对所得的结果作了系统深入的分析,并概述了最后的结论,以期能为有关方面的需要提供参考借鉴。     

Evaluation of humic acid removal by a flat submerged membrane photoreactor

A flat submerged membrane combined with a TiO 2 /UV photocatalytic reactor (FSMPR) was employed in batch mode to remove humic acid (HA). HA removal efficiency was characterized by UV 254 absorbance, UV-vis spectra, dissolved organic carbon (DOC) concentration, specific UV absorbance (SUVA), and trihalomethane formation potential (THMFP). The FSMPR process was effective in removing more than 86% of DOC and nearly 100% of UV 254 absorbance, while the THMFPs of samples were reduced to < 19 μ g/L after 150 min of treatment. In addition, changes in transmembrane pressure (TMP) with and without UV were evaluated; TiO 2 /UV was effective at controlling membrane fouling by HA. Analysis of the molecular weight (MW) distributions and three-dimensional excitation-emission matrix (EEM) fluorescence spectra of HAs revealed that the effectiveness in membrane fouling control is a result of changes in HA molecular characteristics. The TiO 2 /UV photocatalytic reactor caused the degradation of high MW, hydrophobic humic-like molecules to low MW, hydrophilic protein-like molecules, although this fraction was not completely removed during 150 min of treatment and was less responsible for membrane fouling.     

UV/Fenton处理三唑磷农药废水

对UV／Fenton氧化降解模拟三唑磷农药废水进行实验研究．通过测定废水COD_(cr)的变化,考察 [Fe~(2 )]／[H_2O_2],H_2O_2投加量、pH值和初始浓度等因素对三唑磷废水处理效果的影响．结果表明,[Fe~(2 )]／ [H_2O_2]=1:20,H_2O_2为理论投加量Q_(th),pH值为5～7时,光解效果较佳,反应速率常数在0．03 min~(-1)以上,COD_(cr)去除率达到90％．对光解过程的分析表明,三唑磷农药废水的UV／Fenton催化降解过程符合拟一级反应动力学模式．     

葡萄与柴胡科间体细胞杂交再生杂种植株

狭叶柴胡原生质体用强度为 2 6 0 μW/cm2 紫外线照射 0 ,1 ,2和 3min后 ,与酿酒葡萄原生质体融合 .对融合再生的 1 9个单细胞克隆进行表型、同工酶、染色体和 5SrDNA间隔序列分析 .结果表明 ,它们均为体细胞杂种 . 1 1个杂种愈伤组织包括对称及不对称融合产物 ,在培养 5个月时 ,再生了体细胞胚、幼叶及叶丛 ;其中有 4个不对称融合的杂种细胞系在培养8～ 1 0个月后 ,再生出有根的完整小植株 .染色体观察表明 ,完整植株的再生与杂种细胞的染色体数目相对减少相关 .对部分小植株幼叶的核糖体 5SrDNA间隔序列差异的分析 ,证实它们为科间体细胞杂种 .     

环氧大豆油丙烯酸酯的合成及应用研究进展

本文主要介绍环氧大豆油丙烯酸酯近年来的合成研究进展,以及在UV固化涂料、泡沫材料、复合材料等方面的应用和发展情况,并对其应用前景和发展方向进行了展望。     

提高紫外和真空紫外光谱辐照度定标精度的一种方法

描述了一种新的紫外和真空紫外光谱辐照度的定标方法．此方法可以减少光电接收器不稳定性引入的信号误差，使校准工作具有重复性好、精度高的优点，特别适用于光谱辐射强度较弱之光源的定标．用氩气氛替代真空条件，可使真空紫外范围内的定标工作快捷方便并节约成本．     

塑料－玻璃粘接用UV固化胶粘剂的性能

探讨了活性单体、预聚体及偶联剂对UV固化胶粘剂的粘接强度、体积收缩的影响，结果表明，极性单体A、偶联剂B的加入有利于提高胶粘剂的粘接强度，芳香族聚氨酯预聚体胶粘剂体系的粘接强度较高，活性单体官能度越高，体积收缩越大。所研制胶粘剂的剪切强度可达5.98MPa，体积收缩为3.67％，在可见光区透光率为97％，玻璃化转变温度为88.02℃。     

铈氨基酸配合物的UV和CV方法

利用紫外光谱法和循环伏安法研究几种Ce^4 离子氨基酸配合物。结果表明几种氨基酸均能在pH为6的弱酸性条件下与Ce^4 形成配合物，不同的配体与Ce^4 形成的配合物的还原电位均比Ce^4 的更负。配体与Ce^4 的配比不同，形成配合物循环伏安曲线和紫外光谱有差异。     

Correlation of coral fluorescence with nearshore rainfall and runoff in Hainan Island, South China Sea

Under UV-laser excitation, the Porites coral from Longwan bay waters. Hainan Island, could emit yellow-green fluorescence. After fitting the data of the fluorescent intensity (FI) of the coral with the rainfall (RF) in nearshore area of Qionghai. a good relationship between FI and RF was found with a linear formula of RF = 889 — 4.54 FI and a correlation coefficient of 0.78. Based on this formula, the rainfall sequence from 1982 to 1997 has been reconstructed. The peak annual rainfall is usually related to global El nino events. By fitting the data of the fluorescent intensity and the runoff (RO). a quadric formula was obtained as RO = — 0.0279FI —18.59 FI - 950.9 with a correlation coefficient of 0.74. The reconstructed runoff sequence from 1982 to 1997 coincided with the rainfall occurrence. The results indicate that flood and drought incidents in coastal areas of the south China are affected by global change to a great extent.