An experimental investigation of the cross-flow of power law liquids past a bundle of cylinders and in a bed of stacked screens
作者:D. V. N. Prasad、R. P. Chhabra
DOI:10.1002/cjce.5450790106
日期:2001.2
pour une serie de solution aqueuses de carboxymethyle cellulose et d'alginate desodium inelastiques. Les valeurs de facteurs de friction obtenues montrent une bonne correlation avec une definition modifiee du nombre de Reynolds reposant sur la representation en faisceaux capillaires du lit. Lesnouvelles donnees etendent considerablement la gamme des valeurs de vide de ∼0, 6 a ∼0, 87. Des comparaisons
已通过实验研究了垂直于圆柱阵列和筛床中的幂律聚合物溶液的稳定流动。对一系列非弹性羧甲基纤维素和海藻酸钠水溶液的不同空隙率的三个不同测试池(两个管束和一个由筛网制成的床)进行了广泛的压降测量。摩擦系数的结果值与基于床的毛细管束表示的雷诺数的修改定义很好地相关。新数据大大扩展了空隙率值的范围,从~0.6 到~0.87。在目前的实验数据和我们之前基于使用简单细胞模型的计算之间也进行了广泛的比较。两者之间的密切对应证明了这种理想化分析的实用性。总而言之,目前的结果包含以下物理和运动学条件范围:雷诺数:0.01 至 ∼1200;幂律流动行为指数:0.38比1;和三个空隙率值,即0.74、0.78和0.87。在 a etudie de facon experimentale l'ecoulement en 制度永久 perpendiculairement 一个 des 安排 de cylindres et
An expeditious and efficient bromomethylation of thiols: enabling bromomethyl sulfides as useful building blocks
作者:Carolina Silva-Cuevas、Ehecatl Paleo、David F. León-Rayo、J. Armando Lujan-Montelongo
DOI:10.1039/c8ra04002h
日期:——
A new method for the bromomethylation of thiols using paraformaldehyde and HBr/AcOH, minimizes the generation of toxic byproducts. Synthetic utility of α-bromomethyl sulfides was demonstrated through umpolung and free radical chemistry.
Design, Synthesis, Structure–Function Relationship, Bioconversion, and Pharmacokinetic Evaluation of Ertapenem Prodrugs
作者:Sheo B. Singh、Diane Rindgen、Prudence Bradley、Takao Suzuki、Nengxue Wang、Hao Wu、Basheng Zhang、Li Wang、Chongmin Ji、Hongshi Yu、Richard M. Soll、David B. Olsen、Peter T. Meinke、Deborah A. Nicoll-Griffith
DOI:10.1021/jm500879a
日期:2014.10.23
Described here are synthesis and biological evaluations of diversified groups of over 57 ertapenem prodrugs which include alkyl, methylenedioxy, carbonate, cyclic carbonate, carbamate esters, and esters containing active transport groups (e.g., carboxyl, amino acid, fatty acids, cholesterol) and macrocyclic lactones linking the two carboxyl groups. Many of the prodrugs were rapidly hydrolyzed in rat
Diferrocenyl Molecular Wires. The Role of Heteroatom Linkers
作者:Yu Li、Mira Josowicz、Laren M. Tolbert
DOI:10.1021/ja101585z
日期:2010.8.4
"wires", in which two ferrocenes are linked by a conjugated chain, allowing the communication of redox information between the ferrocenes, are a versatile platform on which to investigate notions of molecular conductivity. In this paper, we examine the role of heteroatoms--including O, P, S, and Se, as well as C atoms in various oxidation states--separated from the ferrocenes by intervening double