抗坏血酸和血红素加氧酶系引起血红素降解的比较研究

本文报导了由抗坏血酸(维生素C)和血红素加氧酶系引起血红素降解的比较研究结果.由抗坏血酸引起的血红素降解是非特异性的,产物是胆绿素异构体的混合物;而血红素加氧酶系引起血红素的降解是立体特异性的,产物是专一性的胆绿素Ⅸ_α.     

氯化聚氯乙烯热解产物的光谱分析研究

本文使用透射与反射紫外——可见光谱、红外光谱对氯化聚氯乙烯(CPVC)不同受热程度的热解产物进行跟踪测试和图谱分析。紫外光谱分析表明CPVC受热初期分子链脱氯化氢(HCI)后形成以孤立和短共轭序列的双键为主,通过红外光谱分析,对CPVC分子链上不同结构单元的脱HCI先后次序作了测估,认为-CHCICHCI-结构单元相对稳定,同时CPVC在受热过程中还会发生自由基型无规断链与氧化断链现象。在上述基础上提出CPVC分子链脱HCI反应以单分子消除反应为主,较少发生链式脱HCI反应。     

标签胶的研制

本文介绍以脱脂大豆蛋白粉为主要原料，经降解处理后，加入不同的高分子改性剂和助剂，制得纸和玻璃粘贴用的豆蛋白标签胶。该标签胶粘接力强，耐水浸泡（１５℃以下）达４８小时以上，而且在６５℃热水中脱标容易，便于回归旧瓶。     

纳米TiO2改性竹炭对空气中苯的吸附与降解

采用纳米二氧化钛(TiO2)对竹炭进行改性,并结合FT-IR、EPR图谱及SEM对其性能和结构进行表征,通过气相色谱法研究了改性竹炭对空气中苯的净化效果。结果表明:TiO2既负载到竹炭孔隙的边沿和表面,又没有堵塞竹炭的特殊孔隙,且改性竹炭的自旋数由8.7×1013增加到8.9×1017。纳米改性竹炭可将空气中的苯污染物降解为无毒、无害的二氧化碳和水,且在紫外灯照射下的降解效果最好;当纳米TiO2质量分数为3%时,改性竹炭降解苯12 h的净化率可达93.50%。     

Effect of enzyme and mechanical stirring on the degradation of polyaspartic acid hydro-gel

As a biodegradable polymer, polyaspartic acid(PASP) hydro-gel has been applied in various fields. Although the degradation mechanism of PASP was well studied, to our knowledge, limited research has been done on the degradation of PASP hydro-gel, whose main chain was crosslinked. This work mainly focused on the effects of enzyme and mechanical stirring on the structure of the PASP hydro-gel during its degradation.The change of the molecular weight and swelling ratio indicates that the simple mechanical stirring caused a break at the crosslink point of the PASP hydro-gel's spatial reticular structure with IR and SEM characterization, but has no significant effect on the degradation of the main chain.Changing the PH value of the degradation system also has little effect on the degradation of the main chain. However, the additions of enzyme both resulted in the break at the crosslink point and the degradation of the main chain, the significant decreases of both the molecular weight and swelling ratio of the PASP hydro-gel were observed.     

掺硼金刚石膜电极电化学氧化降解TNT的研究

首先采用循环伏安法研究了TNT在掺硼金刚石(BDD)膜电极上的电化学氧化-还原行为。基于此,开展了以BDD电极为阳极,电化学高级氧化降解TNT废液的研究,考察了电极电流密度对TNT降解率、溶液化学需氧量(COD)的影响。结果表明:随着电流密度从20 mA/cm2增加到150 mA/cm2,TNT降解率及COD去除率均明显增加,但平均电流效率降低,能耗呈线性增加。综合考虑,在较低电流密度下电氧化降解TNT废液降解更经济合理。     

也论法治理论的思想渊源

我国大多数学者认为亚里士多德是西方法治理论的首倡者,而柏拉图则是人治论者的代表。针对这一观点,本文通过介绍柏拉图一部通常为人们忽视的著作——《法律篇》中所体现的法律权威等重要的法律思想,指出柏拉图晚年已由主张人治转向主张法治,《法律篇》中体现出的法律思想是法治理论的思想渊源。     

钨化合物,TiO2对活性绿染料废水的光催化降解

试验研究采用钨化合物，ＴｉＯ２粉末催化剂对活性绿染料废水的光催化降解，通过测定废水中的ＣＯＤ值确定废水降解程度。结果表明催化剂的催化活性顺序为：活性白钨酸〉新制ＴｉＯ２〉蓝色氧化钨〉黄钨酸〉久置ＴｉＯ２〉ＷＯ３。     

Biodegradation of DTP and PET Fiber by Microbe

The degradation of diethylene glycol terephthalate (DTP) and polyethylene terephthalate (PET) fiber by microbe was studied. The degree of DTP degradation was determined by High Performance Liquid Chromatography (HPLC) to be more than 90%. The products after degradation of DTP and PET fiber were various. The degradation of DTP can be described by the first-order reaction model. The degradation of PET fiber was found to be little, but surface erosion of PET fiber could be clearly seen from the SEM photographs indicating there occurred some traces of biodegradation on the PET fiber surface.     

基于C#语言的PKI/CA认证中心的设计

PKI／CA认证中心是目前保证网络信息安全的一种比较可靠的安全体系．本文依照PKI系统的结构框架，给出了一个CA认证中心的结构设计，同时应用目前最先进的C#编程语言，给出了在．NET环境下实现CA认证中心的一种编程方法．