旋风分离式油烟净化器原理分析及其数值模拟

对现代油烟净化技术中的新型旋风分离式油烟净化器进行动力学分析、内部流场模拟,获得净化过程的受力情况及装置内部速度场、压力场,由此对影响净化效果的设计参数和操作条件进行分析、优化以获得最佳效果。结果表明,适宜的筒体直径和筒体高度有助于实现流体在旋转运动过程中最大限度地分离;适宜的入口流速和流体所处温度环境也是提高净化效果...     

岩体结构面力学模型制作新方法试验研究

目前岩体结构面力学模型室内试验研究在相似材料配置、力学模型研制和强度效应分析等方面存在着诸多不足,不能很好的满足定量研究的需要。为了解决这一不足,开展了结构面模拟材料及力学模型制作方法研究,得到一种新型结构面模拟材料,并率先尝试采用3D打印、三维激光扫描和逆向工程技术制作模型结构面。实践证明,研究成果能较好满足结构面室内试验研究的需要,可推广运用。     

环境γ辐射剂量率受降水影响规律研究

利用高气压电离室连续测量我国东部某地环境γ辐射剂量率,同时监测降水参数。研究发现:降水引起剂量率升高,最大升幅达38.1%,降水总量最大的夏季升幅最大;剂量率升幅大雨中雨小雨;降水强度越大,降水开始后剂量率升高越快,剂量率最大值出现点比降水强度最大值出现点晚约1h。同一降水强度条件下,剂量率升高幅度,冬季春季秋季夏季,降雪降雨。     

ETFE充气膜结构设计方法及应用

ETFE膜建筑是一类新型的膜建筑结构体系，其设计方法与普通膜结构有着较大区别文章概要介绍ETFE薄膜的物理力学基本特性，ETFE充气膜系统构成，给出ETFE充气膜基本设计过程，重点阐述了其设计分析过程与普通膜的区别，以及其充气找形、载荷分析、裁剪分析的特点根据试验资料，给出ETFE薄膜材料参数及设计确定方法；详细分析充气系统设计和压力控制设计方法，主要工作状态控制设计逻辑，以及管道设计、风机选型、传感器元件、控制系统的注意事项等。     

Mechanisms and Kinetics of Liquid Silicon Oxidation During Industrial Refining

During oxidative ladle refining (OLR) of silicon, the metal surface is partly oxidized, resulting in the formation of a condensed silica fume (SiO₂). This fugitive emission of silica represents a potential health hazard to the workers in the silicon and ferrosilicon industry. In the current work, industrial measurement campaigns aimed at recording the fume generation during OLR were performed at the Elkem Salten plant in Norway. The measured amounts of silica produced were 2.5–5.1?kg/h, depending on the gas flow rate in the refining process. The rate of silica production correlates with the total flow rate and amount of air in the purge gas, and increases as the flow rate increases. The results of this work suggest that fume generation during OLR primarily results from oxidation of the exposed metal surface, with oxygen transport from the surrounding atmosphere to the metal surface being the limiting factor. Other identified mechanisms of SiO₂ formation were splashing of the metal and/or oxidation of SiO gas carried with the refining purge gas.     

Effects of carbonate on the electrolytic removal of ammonia and urea from urine with thermally prepared IrO<Subscript>2</Subscript> electrodes

Recent studies have shown that electrolysis can be an efficient process for nitrogen removal from urine. These studies have been conducted with urea solutions or fresh urine, but urine collected in NoMix toilets and urinals has a substantially different composition, because bacteria hydrolyse urea quickly to ammonia and carbonate. In this study, we compared electrochemical removal of nitrogen from synthetic solutions of fresh and stored urine using IrO₂ anodes. We could show that in fresh urine both ammonia and urea are efficiently eliminated, mainly through chlorine-mediated oxidation. However, in stored urine the presence of carbonate, arising from urea hydrolysis, leads to an inhibition of ammonia oxidation. We suggest two parallel mechanisms to explain this effect: the competition between chloride and carbonate oxidation at the anode and the competition between chlorate formation, enhanced by the buffering effect of carbonate, and ammonia oxidation for the consumption of active chlorine in the bulk. However, further experiments are needed to support the latter mechanism. In conclusion, this study highlights the negative consequences of the presence of carbonate in urine solutions, but also in other wastewaters, when subjected to an electrolytic treatment on IrO₂ in alkaline media.     

Synthesis, Characterization and Gas Sensing Properties of In（OH）3 and In2O3 Nanorods through Carbon Spheres Template Method

Poly-crystalline In(OH) 3 nanorods have been successfully prepared via a urea-based precipitation using the colloidal carbon spheres as the templates. After calcinations, the resulted In 2 O 3 nanorods with poly-crystalline structure were fabricated. Structure and morphology of the product were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The possible formation process was schemed. The sensor gas properties towards C 2 H 5 OH and CO were examined.     

一种适用于搜索雷达的模拟训练器系统设计

本模拟训练器用于模拟产生适用于搜索雷达的目标视频,生成符合雷达显控台显示要求的目标属性,最大可同时进行99批目标模拟,包括空中、水面、水下目标。同时,还可将模拟产生的目标类型、属性等相关信息通过网络上网,供其它设备按需取用。