COB LED加热高压测试机的研制

为了能更准确地测试COB(chip on board)LED各项参数,COB器件必须在接近工作温度85℃时再进行相关测试。设计出一种在加热系统中,集耐高压测试、分光测试和微点亮识别不良和包装等多功能的一体机,实现COB加热测试自动化生产,避免人为因素的影响,检测精度高。为了兼容大部分的COB尺寸,上料采用图像识别自动上料,探针、对齐机构采用可调整设计,方便快速换产。经实际应用证明,该设备自动化程度高、测试准确、生产效率高、运行稳定,满足客户生产需求。

高凝油井试油电加热技术的研究和应用

江苏油田在高凝油井试油过程中,针对油品物性差无法取得合格的产能和液性资料,提出了测试管柱电加热技术,并辅助深抽工艺,落实高凝油井合格的产能和液性。对电加热工艺的结构原理和特点进行了介绍,通过在庄13-1井、堡4井、邵深1井的现场试用,证实了该工艺的可行性。

基于光纤光栅温度传感器的电缆接头温度监测系统的设计

在电力电缆系统应用中,电缆中间接头温度是重点监测部位,监测电接头的温度可以实现故障预报警的功能,为防止事故的发生提供了有效途径,并且接头温度的监测对电力负荷调整起到重要的作用。针对以上需求,实现对电缆接头温度的测量,设计一个循环可编程载流-温度联合实验系统。运用热学知识理论,分析电缆中间接头相关的热量特征,利用ANYSY软件,分析电缆接头的温度场;用光纤光栅温度传感器测量实际电缆接头温度,并用Origin绘图软件把理论与实际实验所测得温升曲线进行拟合验证。结果表明,该系统对电缆接头的温升变化趋势可以进行实时的监测。

Pyrolysis and co-pyrolysis of lignite and plastic

The study firstly discusses the pyrolysis characteristics and kinetics by thermogravimetric analysis （TGA）, and then investigates the pyrolysis of lignite and co-pyrolysis with plastic （polyethylene or polypropyl- ene） in tube furnace. Meanwhile, the research focuses on the co-pyrolysis products under different mix- ing ratios as well as pyrolysis products at different testing temperatures and heating rates. The results show that higher final testing temperature and lower heating rate contribute to bond fission in lignite pyrolysis, resulting in less char product. In co-pyrolysis, lignite acts as hydrogen donor, and the yields of char and water rise with increasing amount of plastic in the mixture, while the yields of gas and tar decrease; and a little admixture of plastic will promote the production of gas and tar. Kinetic studies indi- cate that in temperature range of 530-600℃, activation energies of lignite are higher than those of lig- nite/plastic blends, and as plastic mass ratio increases from 0% to 10%, samples need less energy to be decomposed during co-pyrolysis.

Processing map and microstructure evaluation of AA6061/Al_2O_3 nanocomposite at different temperatures

Hot compression behavior of Al6061/Al2O3nanocomposite was investigated in the temperature range of350-500°C andthe strain rate range of0.0005-0.5s-1,in order to determine the optimum conditions for the hot workability of nanocomposite.Theactivation energy of285kJ/mol for the hot compression test is obtained by using hyperbolic sine function.By means of dynamicmaterial model(DMM)and the corresponding processing map,safe zone for the hot workability of AA6061/Al2O3is recognized attemperature of450°C and strain rate of0.0005s-1and at temperature of500°C and the strain rate range of0.0005-0.5s-1,with themaximum power dissipation efficiency of38%.Elongated and kinked grains are observed at400°C and strain rate of0.5s-1due tothe severe deformation.

Chemical Oxygen Demand of Seawater Determined with a Microwave Heating Method

This paper investigates a microwave heating method for the determination of chemical oxygen demand (COD) in seawater. The influences of microwave-power, heating time and standard substances on the results are studied. Using the proposed method, we analyzed the glucose standard solution, the coefficient of variation being less than 2%. Compared with the traditional electric stove heating method, the results of F-test and T-test showed that there was no significant difference between the two methods, but the microwave method had slightly higher precision and reproducibility than the electric stove method. With the microwave heating method, several seawater samples from Jiaozhou Bay and the South Yellow Sea were also analyzed. The recovery was between 97.5% and 104.3%. This new method has the advantages of shortening the heating time, improving the working efficiency and having simple operation and therefore can be used to analyze the COD in seawater.

Comparative analysis by simulating and testing pole impact for hot stamping front crossbeam of automobile

Hot stamping 22MnB5 steel plate with ultra-high strength has been widely used for body structural members in consideration of automobile safety and lightweight.This paper presents a verification program of simulating and testing pole impact in order to verify if the front crossbeam reinforcement assembly can meet the design requirements,reduce the overall vehicle simulation and test cost and shorten the operation period.In the same condition,the simulation proved conforming to the design requirements;however,the bumper cracked at the impacting point in the course of pole impact test.The analysis of the crack by optical microscope,Vickers and scanning electron microscope indicates that mixture of ferrite,bainite and martensite was produced in the weld heat-affected zone of the 340/590DP tow hook holder and the 22MnB5 front crossbeam;therefore,their hardness and mechanical property were reduced obviously,so that they fractured when impacted.No welding process with continuous weld but spot welding or other bonding method may be employed for the reason that the capacity of the 22MnB5 steel plate in the weld heat-affected zone was reduced obviously.

Development and Testing of Aluminum Micro Channel Heat Sink

Microchannel heat sinks constitute an innovative cooling technology for the removal of a large amount of heat from a small area and are suitable for electronics cooling.In the present work,Tool Steel D2 grade milling slitting saw type plain milling cutter is fabricated The microchannels are machined in aluminum work pieces to form the microchannel heat sink using the fabricated milling cutter in an horizontal milling machine.A new experimental set-up is fabricated to conduct the tests on the microchannel heat sink.The heat carried by the water increases with mass flow rate and heat input.The heat transfer coefficient and Nusselt number increases with mass flow rate and increased heat input.The pressure drop increases with Reynolds number and decreases with input heat.The friction factor decreases with Reynolds number and decreases with input heat.The thermal resistance decreases with pumping power and decreases with input heat.