咪唑型离子液体热物理性质测量

利用自行搭建的热线法液体热导率和热扩散系数装置测试了两种咪唑型离子液体([C₆mIm][BF₄]和[C₄mIm][BF₄])在不同温度下的热导率和热扩散系数。根据文献报道的密度数据获得了样品的比热容。结果表明:两种离子液体的热导率与温度的相关性不大;两种阳离子结构相似的离子液体热扩散率相近, 热扩散率随温度的升高有明显的变化, 本文认为离子液体内部的离子动量分布与温度紧密相关, 离子间的动量交换随温度的升高而增加, 离子动量分布随温度升高逐渐趋于一致, 离子间碰撞产生的动量交换不再明显改变离子的动量, 导致热扩散率的变化随温度升高而减小。     

Identification of Pathogenicity-Related Genes in Biofilm-Defective Acidovorax citrulli by Transposon Tn5 Mutagenesis

Biofilm formation is important for virulence of a large number of plant pathogenic bacteria. Indeed, some virulence genes have been found to be involved in the formation of biofilm in bacterial fruit blotch pathogen Acidovorax citrulli. However, some virulent strains of A. citrulli were unable to format biofilm, indicating the complexity between biofilm formation and virulence. In this study, virulence-related genes were identified in the biofilm-defective strain A1 of A. citrulli by using Tn5 insertion, pathogenicity test, and high-efficiency thermal asymmetric interlaced PCR (hiTAIL-PCR). Results from this study indicated that 22 out of the obtained 301 mutants significantly decreased the virulence of strain A1 compared to the wild-type. Furthermore, sequence analysis indicated that the obtained 22 mutants were due to the insertion of Tn5 into eight genes, including Aave 4244 (cation diffusion facilitator family transporter), Aave 4286 (hypothetical protein), Aave 4189 (alpha/beta hydrolase fold), Aave 1911 (IMP dehydrogenase/GMP reductase domain), Aave 4383 (bacterial export proteins, family 1), Aave 4256 (Hsp70 protein), Aave 0003 (histidine kinase, DNA gyrase B, and HSP90-like ATPase), and Aave 2428 (pyridoxal-phosphate dependent enzyme). Furthermore, the growth of mutant Aave 2428 was unaffected and even increased by the change in incubation temperature, NaCl concentration and the pH of the LB broth, indicating that this gene may be directly involved in the bacterial virulence. Overall, the determination of the eight pathogenicity-related genes in strain A1 will be helpful to elucidate the pathogenesis of biofilm-defective A. citrulli.     

滴定分析法测定铜的改进

提出在ＮＨ４ＨＦ２介质中，有ＳＣＮˉ存在下，以Ｉˉ３—淀粉为指示剂，硫代硫酸钠滴定铜的分析方法     

高岭土尾砂综合利用工艺研究

高岭土是制瓷工业的主要原料，在开采用加工过程中生产大量尾砂，污染环境且导致资源浪费，通过本试验研究，从尾砂中分选出工业上可综合利用的长石，云母等系列产品，并实现了无尾矿选矿新工艺。     

HDPE／MPA层状容器加工及其阻透性能的研究

本文讨论了HDPE/MPA层状容器的加工以及MPA用量和贮存时间对阻透性的影响,分析了透过滞后、气相和液相透过现象。     

酯交换法合成碳酸二甲酯研究

通过酯交换法，以甲醇和碳酸丙烯酯（ＰＣ）为原料，反应精馏合成碳酸二甲酯，筛选出最佳催化剂，确定了其用量，考察了原料配比等对反应转化率的影响，研究结果表明，催化剂ＣＨＳ－１和ＣＨＳ－２催化效果较好，其较佳用量为０．４％～０．５％（相对于甲醇的质量）甲醇与ＰＣ的质量比为８～１０，反应停留时间为４０ｍｉｎ～６０ｍｉｎ本文报道的酯交换工艺具有一定的工业应用价值。     

Capsella bursa-pastoris extract as an eco-friendly inhibitor on the corrosion of Q235 carbon steels in 1 mol·L-1 hydrochloric acid☆

The corrosion inhibition effect of Capsel a bursa-pastoris extracts (CBE) for Q235 carbon steels in 1 mol·L?1 hy-drochloric acid solution was studied using electrochemical methods, environmental scanning electron microsco-py (SEM) and Raman microscopy analysis. The polarization plots indicate that CBE serves as an effective, mixed-type inhibitor. Linear polarization resistance shows that increasing CBE concentration and temperature results in increased inhibition efficiency. The highest inhibition efficiency can reach 97%when adding 60 mg·L?1 CBE, which is better than some reported plant extracts under the similar environment. The adsorption of CBE molecules is found to obey the Langmuir adsorption isotherm. Some thermodynamic and kinetic parameters for the adsorption process, such as the adsorption equilibrium constant (K), free energy of adsorption (ΔGads), ac-tivation energy of corrosion reaction (Ea) and the heat of adsorption (Q ads), are calculated and discussed. SEM and Raman microscopy analysis also demonstrate the formation of a CBE inhibition film on the metal surface.     

紫外线交联PVC的研究

通过二乙基二硫代氨基甲酸钠（铜试剂）取代PVC上的部分氯原子,在PVC分子链上引入光敏原因,在紫外线照射下,PVC分子可发生交联反应形成交联产物,实验研究了铜试剂用量,接枝反应温度和时间以及紫外光辐照时间对PVC凝胶含量及力学性能的影响,在1kW高压汞灯距试样0.5m、辐照2h的最佳交联条件下,可得到凝胶含量超过83%的产联产物。     

烘烤过程钢包包壁温度场的有限元研究

利用有限元法计算了烘烤过程钢包包壁温度场 ,研究了工作层、永久层和保温层厚度对钢包包壳温度的影响