CaS∶Mn~(2 )荧光体的微波辐射合成及发光特性

用微波辐射法合成了ＣａＳ∶Ｍｎ２＋橙红色荧光化合物，用ＸＲＤ测定了它们的晶体结构，系统考察了各种不同浓度下的Ｍｎ２＋离子激活剂对发光性能影响．初步认为，微波辐射能使Ｍｎ２＋离子在ＣａＳ基质晶格中均匀扩散，并能提高激发剂的掺入量，阻止Ｍｎ２＋离子的簇集，延缓Ｍｎ２＋离子对的形成．合成方法可得到晶相纯、粒度细小均匀、稳定性高、防潮性好和发光效率高的ＣａＳ∶Ｍｎ２＋荧光体．     

Nonspecific reaction of a thiol:Protein disulfide oxidoreductase with the disulfide bonds of insulin

Summary A thiol:protein disulfide oxidoreductase from bovine liver was isolated after separation from protein disulfide isomerase. The enzyme, after activation (reduction) with glutathione, was reacted with stoichiometric amounts of insulin and the sulfhydryl groups of the partially reduced hormone were labeled with iodo (l-¹⁴C)acetamide. After separation of the insulin chains, the radioactivity was found in both the peptides, with a ratio A-chain/B-chain equal to 2/1.     

二氧化锰物理化学性质的研究(Ⅰ)——电池级二氧化锰活性的快速测定

本文从氧化物半导体观点研究了电池级二氧化锰中氧缺位的扩散和影响扩散常数的因素。使用“恒电位二步极化”法求得与MnO_2中氧缺位扩散性质相关的特征因子“I~o”。并结合样品中MnO_2含量,定量地求得电池级二氧化锰的电化学活性,文中还给出了实验数据和对比电池的实际效分值。二者之间存在着良好的一致性。     

Reductive leaching of low-grade manganese ore with pre-processed cornstalk

Cornstalk is usually directly used as a reductant in reductive leaching manganese. However, low utilization of cornstalk makes low manganese dissolution ratio. In the research, pretreatment for cornstalk was proposed to improve manganese dissolution ratio. Cornstalk was preprocessed by a heated sulfuric acid solution (1.2 M of sulfuric acid concentration) for 10 min at 80°C. Thereafter, both the pretreated solu-tion and the residue were used as a reductant for manganese leaching. This method not only exhibited superior activity for hydrolyzing corn-stalk but also enhanced manganese dissolution. These effects were attributed to an increase in the amount of reductive sugars resulting from lignin hydrolysis. Through acid pretreatment for cornstalk, the manganese dissolution ratio was improved from 50.14%to 83.46%. The pre-sent work demonstrates for the first time the effective acid pretreatment of cornstalk to provide a cost-effective reductant for manganese leaching.     

中锰钢两相区退火奥氏体逆转变的数值分析

根据中锰钢热轧组织结构确立两相区奥氏体化的几何模型和初始条件,利用DICTRA动力学分析软件对中锰钢马氏体基体奥氏体化过程进行计算分析。在奥氏体化初期的形核过程中,马氏体中过饱和的碳锰元素从铁素体迅速转移到奥氏体并在相界面奥氏体一侧聚集。后续的相变过程中,碳在奥氏体中快速均化,但锰在相界面奥氏体一侧的聚集加剧。相变初期奥氏体界面推移速度比中后期高出若干个数量级,但随时间推移迅速衰减。相变初期相界面推移是碳扩散主导,相变后期界面推移受到锰在奥氏体中扩散速度制约。温度升高可显著提高相界面推移速度。达到相同数量奥氏体的情况下,低温长时退火有利于锰从铁素体向奥氏体转移并提高其在奥氏体中的富集度,从而提高奥氏体的稳定性。     

纳米孔壳聚糖接枝四(对-羧基苯基)锰卟啉催化氧化乙苯

为模拟细胞色素P-450酶的催化空腔场所,提高壳聚糖接枝四(对-羧基苯基)锰卟啉(Mn TCPP)的催化活性。采用冷冻干燥法制备纳米孔壳聚糖(np-CTS),并用酰化反应接枝四(对-羧基苯基)锰卟啉获得仿生催化材料―Mn TCPP/np-CTS,同时制备相应的无孔催化材料―Mn TCPP/nonp-CTS。用紫外可见光谱(UV-vis),傅里叶变换红外光谱(FT-IR),X射线(XRD),热重分析(TG)和扫描电镜(SEM)技术对其进行表征,并用于催化空气氧化乙苯研究。催化结果表明:在最佳反应条件下(145℃,0.8 MPa),纳米孔壳聚糖接枝四(对-羧基苯基)锰卟啉比无孔催化材料催化活性提高26%,醇酮收率提高38%。实验结果表明:纳米级空腔有利于充分发挥所固载的锰卟啉催化活性,最大程度地提高固载仿生催化材料的催化效率。     

贵州松桃某电解锰企业锰渣重金属污染特征及对植物生长的毒性效应

为综合评估电解锰渣重金属污染特征及任意堆弃对周边植物生长造成的危害,以贵州松桃某电解锰企业锰渣为研究对象,对渣样的重金属元素组成、含量及锰形态进行了分析测试,同时在实验室模拟研究了电解锰渣、浸出液及浸出残渣对白菜、油菜、黑麦草和紫花苜蓿种子的发芽势、发芽率、根长、芽长、鲜重、干重、发芽指数及活力指数的影响。结果表明:电解锰渣及其浸出液重金属主要为Mn,分别为28 000 mg·kg~(-1)、82.00 mg·L~(-1);电解锰渣及浸出液对植物根伸长的抑制效应明显大于对种子发芽的影响,对根伸长的抑制率达42.5%以上,甚至达到100.0%。     

南县地区用水现状及水质复杂的地下水处理

调查分析南县地区用水现状及地下水水质情况，并对铁、锰含量高，浊度大且轻度污染的地下水提出处理方案．