Effect of Ammonia on the Gas-Phase Hydration of the Common Atmospheric Ion HSO4?

Hydration directly affects the mobility, thermodynamic properties, lifetime and nucleation rates of atmospheric ions. In the present study, the role of ammonia on the formation of hydrogen bonded complexes of the common atmospheric hydrogensulfate (HSO₄⁻) ion with water has been investigated using the Density Functional Theory (DFT). Our findings rule out the stabilizing effect of ammonia on the formation of negatively charged cluster hydrates and show clearly that the conventional (classical) treatment of ionic clusters as presumably more stable compared to neutrals may not be applicable to pre-nucleation clusters. These considerations lead us to conclude that not only quantitative but also qualitative assessment of the relative thermodynamic stability of atmospheric clusters requires a quantum-chemical treatment.     

Accelerator Analysis of Tributyltin Adsorbed onto the Surface of a Tributyltin Resistant Marine Pseudoalteromonas sp. Cell

Tributyltin (TBT) released into seawater from ship hulls is a stable marine pollutant and obviously remains in marine environments. We isolated a TBT resistant marine Pseudoalteromonas sp. TBT1 from sediment of a ship’s ballast water. The isolate (10^{9.3 ± 0.2} colony-forming units mL⁻¹) adsorbed TBT in proportion to the concentrations of TBTCl externally added up to 3 mM, where the number of TBT adsorbed by a single cell was estimated to be 10^8.2. The value was reduced to about one-fifth when the lysozyme-treated cells were used. The surface of ethanol treated cells became rough, but the capacity of TBT adsorption was the same as that for native cells. These results indicate that the function of the cell surface, rather than that structure, plays an important role to the adsorption of TBT. The adsorption state of TBT seems to be multi-layer when the number of more than 10^6.8 TBT molecules is adsorbed by a single cell.     

FFFIS编解码算法与实现

在对FFFIS(Form Fit Function Interface Specification)的Eurobalise报文特点进行简单介绍的基础上,对其编解码算法进行了探讨,并根据FFFIS标准提出了高速算法以及系统软硬件实现方案,最后对其应用进行了简单介绍。     

星型聚合物中间体环硅氧烷核的合成研究

以甲基二氯硅烷、四甲基四乙烯基环四硅氧烷(DVi4)为原料,采用硅氢加成反应合成了星型聚合物的中问体环硅氧烷核,并用红外光谱和核磁共振谱进行了表征.反应的最佳条件是:采用预先活化、反应温度72℃、催化荆与DVi4的量之比为1.0×10-4,反应转化率可达95%,且选择性很好,产物主要为β-加成产物.     

十二烷硫基硼酸铈的合成及摩擦学行为研究

合成了油溶性化合物十二烷硫基硼酸铈(简称CeDMB)，并用作润滑油添加剂。采用四球摩擦试验机和环—块试验机评价了其抗磨减摩性能。结果表明，十二烷硫基硼酸铈使HVI500基础油的抗磨性能得到明显改善，承载能力明显提高，摩擦系数明显降低。扫描电子显微镜(SEM)观察证实磨斑表面含有沉积物膜，结合X—射线光电子能谱(XPS)分析，可以推断添加剂在摩擦过程中发生摩擦化学反应，生成的Ce2O3、CeO2和B2O3沉积在摩擦副表面，形成润滑膜，从而改善其抗磨减摩性能。     

液碱纯度对阴床再生运行情况分析

从理论上分析了液碱对阴树脂再生度的影响。通过两种不同纯度的液碱再生阴树脂的实际运行经济指标统计分析，说明用高纯度液碱再生阴树脂，可提高树脂的工作交换容量和周期制水量，有很好的经济效益。