膏体增稠剂底流固相分数和屈服应力的循环变化行为

The trouble-free and efficient operation of paste thickeners requires an optimal design and the cooperation of each component. When underflow discharging is suspended, alleviating the vast torque that the remaining solids within the thickeners may place on rakes mainly lies in the circulation unit. The mechanism of this unit was analyzed, and a mathematical model was developed to describe the changes in underflow solid content and yield stress. The key parameters of the circulation unit, namely, the height and flow rate, were varied to test its performance in the experiments with a self-designed laboratorial thickening system. Results show that the circulation unit is valid in reducing underflow solid fraction and yield stress to a reasonable extent, and the model could be used to describe its efficiency at different heights and flow rates. A suitable design and application of the circulation unit contributes to a cost-effective operation of paste thickeners.     

番茄酱生产中HACCP系统的应用

本文运用ＨＡＣＣＰ管理系统，在番茄酱生产过程中对可能产生食品污染的各种危害因素进行分析，确定关键控制点，制订出相应的预防控制措施，保证产品质量及卫生安全，以提高产品的出口合格率。     

市政工程中回填土夯实存在的问题及改进方法

通过对市政工程中回填土务实存在问题的分析，结合实际，提出合理、简便、有效的改进方法，并收到了良好的效果。     

聚氯乙烯增塑糊流变行为研究——Ⅲ、稀释剂和分散剂的影响

以石油溶剂为稀释剂,4-甲基-2-戊酮(Ⅰ)和2-乙氧基乙醇(Ⅱ)为分散剂,研究了不同PVC树脂增塑糊的粘度特征。结果表明,由于PVC是极性聚合物,分散剂的分散效果主要决定于它的极性,Ⅰ的分散效果优于Ⅱ。若PVC含有聚氧乙烯基型表面活性剂,其糊用PVC树脂颗粒能较好地分散。     

水化早期水泥净浆电导的特征及与凝结时间相关性的研究

通过测定硅酸盐类水泥净浆在水化早期的电导,获知各样品净浆的电导变化均有共同的特点,笔者将水泥净浆电导在水化早期的变化划分为五个阶段,各阶段均能用水化机理或仪器特点进行解释.实验结果表明,水泥净浆电导在水化早期的极值点LK对应的时间TLK与净浆的初、终凝时间存在良好的相关性.     

实用型高T_c超导YBCO线材及器件的研究

陶瓷线材成型的关键之一是选择合适的增塑剂。本研究表明,十八烯-9-酸,即油酸是高T_CYBCO超导粉末成型的优良增塑剂。ESR谱及IR谱均证实油酸在常温时能与YBa_2Cu_3O_(7-δ)中的Y,Ba,Cu的离子反应,同时生成油酸铜配合物等有机盐,高温烧结后可全部分解挥发,在增塑挤压线材中掺入3wt-％-5wt-％的Ag粉,对缓解Y系超导体水解,长时间稳定J_C,降低线材表面电阻等方面起到良好效果。优化线材成型工艺使线材J_C达到800～1000A/cm~2,可满足弱电应用要求。在解决了挤压线材的焊接问题后,已初步试制成R.F.SQUID简易闭合磁通变换器以及小天线。     

煤矸石地基工程特性的试验研究

通过室内土工试验，研究了煤矸石的矿物成分、颗粒级配、压实特性及抗剪强度与压实度的关系。结果表明，煤矸石的矿物成分与粘土很相似，易压实，将煤矸石回填作为建筑用地在技术上是可行的。     

一种超细粉料的减水性

针对辽宁省建设科学研究院自行研制开发的一种复合超细粉料,水泥流动度对比试验证明,此种复合超细粉料较所选择的其他几种外加剂(化学减水剂,LJ1外加剂,LJ2外加剂等)减水效果好;扫描电子显微镜分析证明,掺这种复合超细粉料的硬化水泥浆体结构比纯硬化水泥浆体结构致密·从理论上分析了该超细粉料的减水机理,并给出粉料粒径的适宜范围:1～3μm·     

牛顿粘滞定律中粘滞系数两种推导方法

给出气体处于非平衡态时，输运过程中的牛顿粘滞定律、粘滞系数及其物理意义，着重从微观角度给出粘滞系数两种较简便推导方法．     

Voltammetric determination of estrogens based on the enhancement effect of surfactant at carbon paste electrode

Highly sensitive voltammetric method for the determination of estrogens, based on the enhancement effect of cetyltrimethylammonium bromide (CTAB) has been described. In the presence of CTAB, the oxidation peak currents of estrogens (estradiol, estrone, estriol, estradiol valerate and diethylstilbestrol) as the carbon paste electrode (CPE) increased significantly after open-circuit accumulation. The peak current was proportional to the concentration of estradiol over the range from 5×10⁻⁹ to 2.5×10⁻⁶ mol·L⁻¹. The detection limit was 8×10⁻¹⁰ mol·L⁻¹ at 6 min of accumulation. The total amounts of estrogens in the blood serums were determined and the average recovery was 104.92%. Under the conditions used, the electrode process of estradiol was examined the mechanism for peak current enhancement was also discussed. Foundation item: Supported by the National Natural Science Foundation of China (60171023) and the Natural Science Foundation of Hubei Province (99J060) Biography: Wu Kang-bing(1977-), male, Ph.D. candidate. research direction: bioelectrochemistry.