气浮-水解酸化-SBR处理裘皮生产废水

某皮革有限公司以山羊皮为原料皮，年生产80-100万张裘皮。该公司生产工序包括两个湿操作和千操作两部分，湿操作包括准备工段和鞣制工段，干操作也就是整饰工段。裘皮生产污水主要来自湿操作各工序，根据裘皮生产工艺可以分为四股废水：1．浸水脱脂及其洗水；2．浸酸、铬鞣及洗水；3．染色加脂及洗水；4．其他污水、冲洗、饱和滴漏等，每天外排污水量为2000m^3。该工程采用气浮法-水解酸化法-SBR法综合处理工艺，处理后出水达到《污水综合排放标准》（GB8978-1996）一级标准。     

298K毛吸附溴化烷基三甲铵的性质及自由能

用液 /固吸附计量置换模型 ( SDM- A) ,研究了 2 98K羊毛纤维吸附溴化烷基三甲铵阳离子表面活性剂 CTAB和 DTAB的吸附等温线 ,结果表明它们均遵从 SDM- A的线性作图关系 .用 SDM-A的线性参数βα 和 q/z很好地描述了碳氢链长及加盐效应对于吸附性质的影响规律 ,特别是能定量地描述加盐效应对于吸附同时具有的促进和抵消两种相反作用的程度 ,并用 SDM- A的热力学 ,由线性参数计算得到了不同体系的吸附亲和能 ΔGA,解吸能 ΔGD 及总过程的自由能 ΔGP.一个吸附体系中 ,ΔGA 为常数且为较大的负值 ;ΔGD 为随溶液体相浓度 c增大而增大的正值 ;ΔGP为与 lgc呈线性关系的较小的负值 .计算所得结果能很好地解释实验事实 ,并可从更深层次上揭示吸附机理 .     

Hydrostatic settling velocity of sediments

The settling of sediments is an accelerative process in which the concentration of the main sediments zone will heavily influence settling velocity, but the explicit relationship between the concentration and settling velocity has not been reported in literature. Here a theoretical function was built for the time dependent concentration and time dependent settling velocity of sediments ; then the entire settling process reflecting concentration was shown on the basis of sediments instant-settlement theory and mathematical method. Agreement of computed results and experimental data was found. Several governing parameters, including particle size,particle density,inltial suspended sediments concentration and suspension height, were discussed with a series of calculated velocity curves. The research indicated that (1) the presented concentration-velocity time relationship is rational, (2) settling process of the sediments group with variation of concentration consists of acceleration stage, uniform motion stage and deceleration stage, and (3) particle size, particle density and initial suspended sediments concentration have more influence on the settling velocity than the suspension height and water temperature.     

碱性耐火材料中的直接结合

碱性耐火材料很多的优良性能是源于其直接结合的显微结构."直接结合"的耐火材料也是未来发展的一个趋势.对碱性耐火材料中的直接结合做了较全面的论述,包括直接结合的分类、实现途径及评价标准等,并例举了一些较典型的直接结合的碱性耐火材料.     

C-S-H中Al3+离子的固溶对表面吸附碱量的影响

研究了Al3+离子的固溶对C-S-H表面吸附Na+离子量的影响.实验结果表明,Al3+离子固溶于C-S-H结构中将使C-S-H表面所带的负电量增大,因而也就增大了C-S-H表面对Na+离子的吸附能力.     

Mechanical Properties of Laterally Driven Microresonance with a One-Side Straight-Leg Suspension

The mechanical properties of lateral polysilicon comb-driven microresonators suspended from one-side straight-leg beams, which are widely used in linear microvibromotors, are investigated in this paper.The lateral vibration of the microresonator was modeled assuming that the symmetry of the microstructures and the applied loads are different. Methods were given to calculate the stress, lateral displacement, spring coefficient, and resonant frequency. The results show that the simple mechanical model is a superfluous system with three unknown variables. The results differ from pervious results for a microresonator suspended from double-side straight-leg beams, which has been commonly used to design linear microvibromotors.     

氯仿在悬浮TiO2体系中的降解

分别用光还原沉积法制备的掺铂TiO2纤维和商用TiO2作为催化荆，对氯仿进行光催化降解。通过测定Cl^-浓度发现不同通O2方式对氯仿的光降解有很大影响，O2的存在，促进了氯仿的降解；并进一步对溶液中的溶氧量(DD)测定，发现DO值呈线性下降且氯仿降解过程中有氧降解和无氧降解2种机理是共存的；同时发现上述2种催化剂的反应现象大相径庭，并结合了有机质液相吸附理论对其反应现象进行分析，发现纤维状微观结构是其高光催化性能的直接原因。     

处理酿酒厂和乙酸废水生物颗粒中的细胞外聚合物

处理酿酒厂废水的生物颗粒与乙酸的生物颗粒相比,具有相当强的抗损耗和溶解能力是因为较高含量的ECP.每mg由Methanothrix细菌组成的后者平均只含有0.09 mg的ECP.但是前者含有0.15 mg的ECP,主要是因为高含量的ECP存在于位于生物颗粒表面的hydrolytic/fermentative 细菌和中间层的syntrophic细菌之中的缘故.     

一锅法合成手性双取代不对称脲

牟其明1,薛翠花1,向明礼2,孙　靖1,陈淑华1, (1.四川大学化学学院,成都610064;2.四川大学化工学院,成都610065)1　引言非对称取代脲是一类极为有用的重要精细化学品和化工原料,可广泛用作农业上的除草剂、杀虫剂、植物生长调节剂和医药领域中的重要中间体[1].在非对称取代脲的结构单元中含有不同取代具有生物活性的肽键,故非对称脲单元是许多生物模拟肽的常见结构特征[2].因此,非对称取代脲具有广泛的应用前景.近年来,取代脲在分子识别、自组装等超分子化学领域显示良好的应用前景,因而设计合成包含脲基的人工受体引起超分子化学家的广泛关…