含乳化油污水的超滤膜分离模型

采用外压管式聚丙烯腈（ＰＡＮ）超滤膜对含乳化油污水进行分离，由实验结果拟合出模型参数，建立了对含乳化油污水进行处理的数学模型。用模型进行通量预测，并结合实验结果对渗透通量的控制因素进行了分析。结果表明，当操作压力大于０．２ＭＰａ及料液中乳化油浓度≥３ｇ／Ｌ时，膜面已形成凝胶层；当压力较低或浓度不大时，渗透通量受浓差极化渗透压的控制。     

碘值,亚甲基蓝及焦糖脱色力与活性炭孔隙结构的关系

分析测定了原料及活化方法不同的几种活性炭的常规性质和孔隙性质，研究了活性炭的碘吸附值、亚甲基蓝脱色力及焦糖脱色力与活性炭孔隙结构之间的关系，得知活性炭对这３种物质的吸附能力，取决于其孔隙结构中半径０．５５ｎｍ附近、０．８ｎｍ附近及１．４ｎｍ以上孔隙的发达程度。     

分散式污水处理综述

阐述了分散式污水处理的概念,介绍了分散污水处理系统的类型和技术,并对污水集中处理和分散处理进行了比较。     

Membrane resting potentials in cultured mouse neuroblastoma cells

Summary Membrane resting potentials (MRP) were measured systematically in cultured mouse N₂A neuroblastoma cells: 1) in the logarithmic growth phase; 2) in subconfluent cultures; 3) in confluent cultures; 4) after dBcAMP had induced morphological differentiation. Neurite extension was accompanied by a significant increase in MRP as compared to the appropriate controls. No significant differences in MRP were observed with regard to the different growth phases.     

ON THE CALCULATION OF MESOPORE SIZE DISTRIBUTION BY THE GAS ADSORPTION METHOD

Seeing that some commercial gas adsorption instrument still uses a too rough method for cal-culation of mesopore size distribution, we reviewed some practical methods of calculation so farproposed in the literature. We have found that most of these methods and many books have someincorrectness in the geometric factor Q_i used for the calculation of pore volume △V_i from corevolume △V_i~k. It has been proved that the correct expression for Q_i should be[_i/(_i~k+1/2△t_i)]~2for cylindrical pores, _i,/(_i~k+1/2△t_i)for slit-shaped pores. On the basis of this correct Q_i,these methods were applied to the desorption isotherms. The results were compared and analyzed.     

Identification of hemolytic granules isolated from human myocardial cells

Summary Human myocardial cells from fresh autopsy material contained granules which possessed hemolytic activity against guinea pig and rabbit erythrocytes. The hemolytic granules, which had a density of 1.02 and a diameter of 200–300 nm, were recovered as a microsome fraction from subcellular homogenates of human myocardial cells by differential centrifugation in 300 mM sucrose containing 0.1 mM PMSF and 10 mM EDTA. The membrane lesions caused by the granules were ring-like structures with an internal diameter of about 10–17 nm, analogous to that caused by perforin- and complement-induced lysis. However, the requirement for divalent cation differed from that for perforin-induced lysis, since the microsome-mediated lysis occurred in the presence of EDTA.     

香精微胶囊的制备及其性能研究

以香精为芯料,以明胶-阿拉伯胶为囊材,通过复凝聚法制备出一系列不同工艺条件下的微胶囊,分别测得微胶囊的内径、外径和膜厚,从而揭示出微胶囊制囊工艺对微胶囊性能的影响规律。     

渗硫处理对常温固化粘结润滑膜耐磨性影响的研究

本文作者通过对45#钢底材渗硫处理对常温固化粘结润滑膜耐磨性影响的研究,发现了经低温熔融硫浴法处理后,再喷涂常温固化干膜,可以使干膜的耐磨寿命延长0.6倍,并用多种测试分析手段详细考察了渗硫层的成分、组织,并就渗硫处理对润滑膜寿命的影响进行了解释。     

活性炭吸附分离去除腈纶溶剂循环系统中铁离子工艺研究

在建立腈纶溶剂中铁含量分析方法的基础上,选择不同种类和结构的国产活性碳样品,用静态吸附法初步评价对其铁离子的选择性吸附能力,然后采用固定床动态吸附法测定铁组分的穿透曲线,评价其动态吸附能力的大小,从而决定最佳的活性碳,最后讨论了动态脱附条件对活性碳柱再生程度的影响。