介孔结构空心球状WC粉体催化剂的制备与表征

以偏钨酸铵为钨源, CO为还原性气体和碳源, 采用喷雾干燥微球化处理—气固反应法制备了具有介孔结构空心球状的WC粉体. 采用XRD, SEM, EDS和TG-DTA等分析手段对样品的形貌、物相组成、化学成分以及在空气中的热稳定性进行了表征. 结果表明, 碳化钨粉体为缺碳含氧的WC相, 化学成分为W, C, O, W与C的原子比接近1∶1; 碳化钨颗粒为分散性良好的空心球状, 表面具有介孔结构; TG-DTA曲线表明, 样品在空气中具有良好的热稳定性.     

两段变温法水热合成多级孔ZSM-5分子筛及其催化裂化性能

以四丙基氢氧化铵（TPAOH）为单一模板剂,采用低温老化、高温晶化2段变温法合成出了球状多级孔ZSM-5分子筛。利用XRD、FT-IR、NH₃-TPD、SEM、TEM以及氮气吸-脱附等测试对合成样品进行了表征。结果表明：直径约为2 μm左右的球状多级孔ZSM-5分子筛颗粒内的晶间介孔和大孔主要由棒状纳米晶堆积而成的,该产品具有较大的比表面积和介孔孔容。同常规水热法一步合成的微孔ZSM-5分子筛相比,2段变温法合成的多级孔ZSM-5分子筛具有更高的B酸/L酸比例（C_BP/C_LP）、强酸/弱酸比例（C_s/Cw）以及活性位可接近性指数（ACI）。催化裂化评价结果显示,得益于活性位可接近性指数等指标的提高,球状多级孔ZSM-5分子筛比常规合成的微孔ZSM-5分子筛具有更高的转化率和丙烯收率等优异的催化性能。     

球状晶体中的拉曼散射和布拉格衍射(英文)

The results of optical properties investigations for some types of globular crystals, including artifical opals and amorphous substances, constructed from the globular nanoclusters are represented. The spectra of light reflection from the surface of received opals have investigated at different incident angle（under mirror-reflection geometry）： 0, 20, 30, 45 and 60 degree.     

胺化反应中球状SP催化剂的应用条件

研究了氨和甲醇为原料，在常压固定床上球状ＳＰ催化剂合成二甲胺，考察了反应温度、进料氨醇比、甲醇液相空速等反应条件对甲醇胺化反应的活性及二甲胺选择的影响，找出了一组较佳的反应条件。     

球状稀土夹杂物改善易切削钢切削性能机制的研究

通过自行设计的高温显微切削装置,在不同温度上对含有球状稀土硫化物夹杂的易切削钢进行了高温显微切削实验,观察到球状稀土硫化物夹杂在显微孔洞扩展过程中发生滚动。通过分析认为,在切屑形成过程中,球状夹杂物在显微孔洞中的滚动是改善易切削钢切削性能的重要因素之一。     

聚丙烯偕胺肟-聚乙烯醇大孔球状载体的合成及固定化嗜热菌蛋白酶的研究

以线型聚醋酸乙烯酯为致孔剂,由悬浮聚合制得了丙烯腈-醋酸乙烯酯-二乙烯基苯大孔树脂(MR-AV树脂),通过MR-AV树脂的化学改性,合成了聚丙烯偕胺肟-聚乙烯醇大孔球状载体(MR-AVa载体),用FT-IR、SEM、压汞仪和元素分析法研究了树脂及载体的结构与组成,结果表明MR-AVa载体含氮量较高,具有一定的亲水性,且平均孔径大于8,000(?),嗜热菌蛋白酶用戊二醛固定于所得载体之上。以酪蛋白为底物,考察了固定化嗜热菌蛋白酶的催化水解活性及其影响因素,与可溶酶比较,固定化嗜热菌蛋白酶的热稳定性和抗抑制能力显著提高,当载体孔径较大时,所得固定化酶显示出较好的催化活性。     

空间球状区域上的关联函数

本文在空间球状区域上给出了距与位值的概念，并建立了三元关联函数，推广了已有的结果。     

STATISTICAL PROPERTIES OF LONG-RANGE CONTACTS IN GLOBULAR PROTEINS

The analysis of residue-residue contacts in protein structures can shed some light on our understanding of the folding and stability of proteins. In this paper, we study the statistical properties of long-range and short-range residue-residue contacts of 91 globular proteins using CSU software and analyze the importance of long-range contacts in globular protein structure. There are many short-range and long-range contacts in globular proteins, and it is found that the average number of long-range contacts per residue is 5.63 and the percentage of residue-residue contacts which are involved in long-range ones is 59.4%. In more detail, the distribution of long-range contacts in different residue intervals is investigated and it is found that the residues occurring in the interval range of 4-10 residues apart in the sequence contribute more long-range contacts to the stability of globular protein. The number of long-range contacts per residue, which is a measure of ability toform residue-residue contacts, is also calculated for 20 different amino acid residues. It is shown that hydrophobic residues (including Leu, Val, Ile, Met, Phe, Tyr, Cys and Trp) having a large number of long-range contacts easily form long-range contacts, while the hydrophilic amino acids (including Ala, Gly, Thr, His, Glu, Gln, Asp, Asn, Lys, Ser, Arg, and Pro) form long-range contacts with more difficulty. The relationship between the Fauchere-Pliska hydrophobicity scale (FPH) and the number of short-range and long-range contacts per residue for 20 amino acid residues is also studied. An approximately linear relationship between the Fauchere-Pliska hydrophobicity scale (FPH) and the number of long-range contacts per residue CL is found and can be expressed as     

P507(K)-醇-正庚烷-水四组分微乳液体系的结构参数

根据球状模型并结合稀释法求得了P507(K)-醇(正戊醇、正己醇、异戊醇、异己醇)-正庚烷-水四组分微乳液的结构参数：水内核半径R_w、颗粒有效半径R_e、界面层厚度l、颗粒平均聚集数、颗粒总数N_d以及分散相所占总界面面积A_d。结果表明，R_w与ω(水与表面活性剂摩尔数之比)成线性关系。由直线的截距还求得P507(K)极性头的水化层厚度为0.58 nm。