铬钼钢窄间隙埋弧焊用烧结焊剂的研制

本文叙述了铬钼钢窄间隙埋弧焊用烧结焊剂的研制,结合生产使用中对该焊剂的特殊要求,提出了使用该焊剂时对脱渣性、氧化性、电弧稳定性及表面压坑的解决办法。通过各项性能的试验,结果表明:GZ-3,GZ-4焊剂生产制造过程简单,具有较高颗粒强度,较低吸潮性,焊接工艺过程稳定,达到了国内外同类型焊剂水平。     

硅片氧化过程及其对硅中杂质分布影响的分析

利用带活动边界的“D＇Alembert变分法”分析了硅片的氧化过程及此过程所引起的硅中杂质的再分布.氧化过程的理论分析结果及对两种常见的杂质初始分布的计算结果均与实验相符.     

Differential changes in Cu,Zn and Mn superoxide dismutase activity in developing rat brain and liver

Summary The aim of our study was to assess the pattern of copper and zinc-containing superoxide dismutase (Cu, ZnSOD) and manganese-containing superoxide dismutase (MnSOD) activity from embryonic life to senescence in rat brain and liver. The two isoenzymes showed different profiles in the two organs examined. In particular, the cerebral MnSOD activity profile suggests a primary role during differentiation of this enzymatic form.     

The oxidative and adsorptive effectiveness of hydrous manganese dioxide for arsenite removal

This study focuses on the effectiveness of hydrous manganese dioxides (δMnO2) removing arsenite (As(Ⅲ)) from aqueous solution. Effects of such factors as permanganate oxidation, pH, humic acid and Ca2 on As removal and possible mechanisms involved in have been investigated. Permanganate oxidation increases As removal to a certain extent; the higher pH results in the formation of more easily adsorbed As species, contributing to higher As removal; humic acid occupies adsorbing sites and decreases ζ potential of δMnO2, therefore inhibiting As removal; Ca2 facilitates As adsorption on δMnO2, mainly through increasing ζ potential and decreasing repulsive forces between As and surface sites. δMnO2 exhibits oxidative and adsorptive potential for As(Ⅲ), and may be employed as adsorbents or filter coating for As removal in water treatment process.     

Partial Discharge Characteristics in the Course of Aging within XLPE Insulation

This paper deals with the experimental study on the correlation between partial discharge （PD） characteristic parameters and corresponding aging degree of insulation in the course of the aging within eros,s-linked polyethylene （XLPE） insulation. The aging tests were performed on a section of 10 kV transmission cable by means of water needle method. The PD macroscopic characteristic parameters were found to be significantly dependent on the corresponding aging degree of insulation in the course of aging of XLPE, and different kind of aging stage has different characteristics. Beside, there are similar regularity but different PD amplitude in the course of aging of XI.PE insulation in different electrolyte, and their insulation life is different. Therefore, according to the chan ging regularity of the PD macroscopic characteristic parame ters within XLPE insulation judging the aging degree of XLPE insulation will be an effective method.     

接触氧化低温运行研究

制革污水在水温为０－１０℃的低温条件下，利用生物接触氧化法进行污水处理。试验结果表明，只要生物接触氧化池中的水温不低于４℃时，适当增大供氧量，就无需进行保温，加温。ＣＯＤ、ＢＯＤ的去除率仍能保持较高水平。     

工业硫酸亚铁对A~2/O氧化沟除磷效果的影响

以汕头龙珠水质净化厂部分运行工段作为实验对象 ,将工业硫酸亚铁投加于A2 O氧化沟的好氧段 ,测定出水中总磷的变化 ,发现硫酸亚铁的投加能够迅速、直接地提高氧化沟的除磷效果 ;同时辅以相差显微镜对A2 O氧化沟的厌氧段、缺氧段、好氧段的活性污泥进行观察并摄影 ,发现工业硫酸亚铁的投加对活性污泥的性质并无改观作用     

低碳钢圆轴扭转实验研究

根据实验研究的结果对低碳钢圆轴的扭转屈服过程,屈服扭矩的确定,冷作硬化现象和时效处理影响提出了几点新的看法。     

合金元素对Al-Li合金破断特征的影响

本文研究了二元Al-Li合金的破断机制,指出该合金低塑性的原因是共面滑移,δ相和PFZ共同作用的结果。进而研究了添加Zr,Cu,Mg后合金的析出强化行为及其对合金破断特征的影响,分析了塑性和强度改进的原因。     

论有机氧化还原反应

本文用氧化数概念说明有机氧化还原反应的含义,解释有机物在氧化还原反应中的行为。