Numerical study on micromixers with Wall-Fractal structure

Microsystem Technologies - The ability for low reagent consumption and minimum waste production in a miniaturised system has generated great interest in the green chemistry field and medical...     

核反应堆压力容器可靠性分析

本文介绍了反应堆压力容器可靠性的概率分析方法。其主要内容包括初始裂纹、裂纹扩展、载荷条件和物性参数等的概率分布.     

数字样机技术在柔性机构可靠性设计分析中的应用

将数字样机技术应用到某型号飞机的前起落架机构的可靠性设计分析中,成功解决了其中的关键技术,取得良好的效果.以工程应用为目的,在商业软件基础上进行了二次开发,搭建了一套基于数字样机技术的机构可靠性设计分析系统,同时引入了灵敏度分析,将可靠性设计与灵敏度分析相结合,提高了可靠性设计分析的效率,增强了该技术的工程实用性.     

精对苯二甲酸市场分析

着重论述了精对苯二甲酸的国内供需、市场及价格,并针对国内精对苯二甲酸供应量的增速远远超过需求量的增速的问题,提出了几点发展建议。     

An Injectable Self‐Healing Multifluorescent Hydrogel Formed by Engineered Coiled‐Coil Polypeptide and Quantum Dots

An injectable and self‐healing multifluorescent hydrogel system based on engineered coiled‐coil polypeptide and CdSe@ZnS quantum dots (QDs) is developed. The mechanical properties of the PC₁₀A‐QD hydrogel are able to be tuned by changing the concentrations of PC₁₀A and QDs. The G′ of PC₁₀A hydrogel increases from 800 to 1000 Pa by doping 6 nm oil‐soluble CdSe@ZnS QDs. The PC₁₀A‐QD hydrogel can easily pass through a 26‐gauge needle without clogging. In addition, through interfacial assembly of PC₁₀A polypeptide on the surface of the PC₁₀A‐QD hydrogel, each of these hydrogel can self‐assemble into a multifluorescent hydrogel. This approach for preparation of injectable self‐healing multifluorescent hydrogels is expected to apply in biomedicine.     

中温龙泉青瓷的试制

本实验在还原气氛下,以Fe为着色剂,采用常见的陶瓷原料仿制中温龙泉青瓷,取得了良好的效果。本文分析了Si/Al摩尔比、釉中铁的含量、烧成制度等因素对青瓷呈色及效果的影响,探讨了工艺因素与釉面呈色间的关系。     

Monodisperse droplet formation through a continuous jet break‐up using glass nozzles operated with piezoelectric pulsation

In this article, a glass nozzle driven by piezoceramics is used to experimentally study the continuous generation of a stream of monodisperse droplets from the breakup of a liquid jet. The approach is demonstrated by examining the breakup dynamics of three distinct liquids. The droplet formation process has been found to be highly controllable and reproducible. The dependence of nozzle performance on liquid properties, flow rate, and disturbance frequency has been investigated. The ratio between the actual disturbance frequency and Reynolds number, ω, is employed at first to represent the operating range that facilitates monodisperse droplet formation. Then, the dimensionless quantity ω*, obtained by multiplying ω by the viscous characteristic time, r/(μ/ρ), has been shown to collapse the data for the lower and higher bounds of the actual disturbance frequency ranges that secure monodispersity of the droplets of all the samples tested. The impacts of liquid flow rate and disturbance frequency on the monodisperse droplet size and spacing between two neighboring droplets have been investigated and discussed. © 2010 American Institute of Chemical Engineers AIChE J, 2011     

锌锰干电池两种代汞缓蚀剂

通过浸泡实验,极化测量考察了在26％NH_4Cl溶液中BiCl_3、有机复合物MA对锌的缓蚀性能,并与HgCl_2的情况进行了对比。结果表明铋类似于汞同为阴极型缓蚀剂,但其适用的浓度范围较窄,在有氧存在时失去缓蚀作用。MA则为阳极型缓蚀剂,有较宽的浓度适用范围,在有氧存在的条件下,仍表现较好的缓蚀作用。     

高聚物喷孔上气泡的行为

研究了水中有机玻璃、硬聚乙烯喷咀上气泡生长的过程，探讨了气流率、喷孔形状对气泡形成的影响，并导出了气泡直径和气泡扩展直径的计算公式．关联式计算值与实验值相吻合．