Rheological characteristics of foamed gel for mine fire control

Foamed gel as a new type of fire extinguishing material is used to prevent the spontaneous combustion of coal. In order to make a comprehensive study on rheological characteristics of foamed gel for mine fire control, by using type NDJ‐5s digital viscometer, the factors such as mass concentration of the mixture mixed by thickener and crosslinker, foaming multiple, added salts (NaCl, CaCl₂, AlCl₃), pH value and temperature having influences on the rheological properties of foamed gel have been investigated in this paper. It can be found that foamed gel shows the characteristic of non‐Newtonian fluids and has shear‐thinning properties. With increasing of mass concentration of the mixture, the thixotropy response becomes more significant. When the foaming multiple reaches 20, the apparent viscosity gets the maximum value. The obvious viscosity characteristic of ‘polyelectrolyte solution’ is observed in aqueous salt solutions when added salts are put into the solution. Under different conditions of pH values, foamed gel has higher sensitivity to acid than alkaline. Zero shear viscosity, depending on temperature, decreases with the temperature increasing. Meanwhile, the fire performances of foamed gel are studied experimentally and theoretically. Copyright © 2014 John Wiley & Sons, Ltd.     

简析如何降低卷烟厂空调的电能消耗

简要分析了卷烟厂空调系统电能耗过高的原因，提出了降低卷烟厂空调系统电能耗的有效途径，以实现卷烟厂节能降耗的目标。     

电子调速器控制器的电磁兼容分析与试验验证

基于辐射发射的形成机理,以某型号电子调速器控制器为目标,利用EMSCAN电磁干扰扫描系统对控制器进行近场辐射测试,总结出一套切实可行的辐射发射分析与试验验证方法.在此基础上,对该型号电子调速器控制器进行了整改设计,并进行了试验验证.结果 表明:基于EM-SCAN系统的分析及整改方法效果明显,缩短了电子产品电磁兼容问题的整改设计周期,并节约了测试成本.     

Study on Thermal Response of Adhesively Bonded Honeycomb Sandwich Structure in High Temperature

Fire Technology - Thermal response of the honeycomb sandwich structure was evaluated using the steady-state method at different temperatures ranging from 100°C to 400°C. The results...     

How to extract traditional cultural design elements from a set of images of cultural relics based on F-AHP and entropy

Multimedia Tools and Applications - The creative cultural product design, relating to both typical regional cultures and traditional cultural elements, is a hot issue in recent years. However,...