电厂除氧器结构安全性的在线检测

将现代测试技术与疲劳损伤理论结合起来 ,设计了一套除氧器结构安全性在线检测系统。通过结构危险部位应变、温度的在线直接检测 ,进而达到对整个结构损伤检测及安全性寿命评估的目的。应用该系统对电厂设备的安全生产维护起到了积极的作用     

电气设备的在线检测

随着电网的发展,电力设备的结构也越来越复杂,自动化程度越来越高,各子系统的关系也越来越密切,一旦设备的某个部分在运转过程中出现故障,就很可能中断生产,造成巨大的经济损失,甚至带来灾难性的后果。为确保电力系统安全、经济、稳定运行,对设备故障的在线监测诊断将显得尤为必要。为此,本文作者主要就电气设备实施在线检测要求、步骤进行了阐述,同时通过实例分析得出了其良好的效果。     

药品包装的在线检测

在片剂、胶囊的生产中，利用在线检测系统对产品的质量进行检测，更快、更准确，大大方便了药物的生产过程。[编者按]     

真空炉炉温的在线检测

介绍了应用Datapaq炉温检测系统对真空炉炉温进行实时在线检测,克服了真空炉炉温传统检测方法的问题和缺点,提高了工作效率。     

板材表面质量在线检测方法概述

板材表面的质量决定了板材的使用性能、寿命、工作可靠性等一系列重要参数,因而在工程上,对于影响板材表面质量的因素以及针对板材表面质量的检测方式也越来越受重视。文中分别介绍和分析了板材常见的几种缺陷形式、板材表面质量对其使用性能的影响,并以高精度钢板为例介绍表面缺陷的传统无损检测技术、激光扫描和机器视觉技术;最后,通过各种检测方式的结果对比得出结论。     

电力设备局部放电信号的在线检测系统分析

对于电力设备局部放电的检测,主要对以光学信号为检验基础的系统进行了分析。通过实际的验证,表明本系统对电力设备局部放电信号的在线检测有着高度的灵敏和强大的抗干扰能力的特性。     

彩色印刷品缺陷在线检测方法的研究与探讨

介绍彩色印刷品图像在线检测的基本流程.探讨相比于灰度图像缺陷在线检测的几个关键技术,对彩色印刷图像颜色缺陷在线检测提出一些新思路.     

液体流量计在线检测装置的研究

文章研究开发了一套液体流量计在线检测装置,很大程度上解决了许多液体流量计（特别是大口径液体流量计）的在线检测问题。该装置采用超声波流量计作为标准表,针对其硬件接口进行软件编程,实现了检测数据自动采集、证书记录自动打印、联网信息查询等功能。     

聚合物挤出加工在线检测技术进展

聚合物挤出加工能有效地将聚合物熔融和机械混合的优势结合在一起,是制备高性能聚合物材料的重要手段。然而,挤出机复杂的几何结构和瞬态流动特征导致了挤出加工过程中的流动和混合非常复杂。因此,为了理解挤出加工过程,开发实时的在线检测技术尤为重要。文中从聚合物熔体的流动、混合和反应等角度综述了近些年来聚合物挤出加工过程中各种在线检测技术,并对这一领域的技术发展进行了展望。     

Analysis of optimum configuration of two-stage thermoelectric modules

In this paper, the theoretical analysis and stimulating calculation were conducted for a basic two-stage thermoelectric module, which contains one thermocouple in the second stage and several thermocouples in the first stage. The study focused on the configuration of the two-stage thermoelectric module, especially investigating the influences of some parameters, such as the allocation of the junction temperature difference in the module, the length of thermocouples and the number of thermocouples, on the cooling performance of the module. The obtained analysis results indicate that changing the junction temperature difference in the second stage, the length of thermocouples and the number of thermocouples in the first stage can improve the cooling performance of the module. These results can be used to optimize the configuration of the two-stage thermoelectric module, and provide guides for the design and application of thermoelectric cooler.     

Ultrasonic extraction and field-portable anodic stripping voltammetric measurement of lead in dust wipe samples

Dust wipe samples were subjected to ultrasonic extraction (UE) in diluted nitric acid, and then analyzed for lead content using field-portable anodic stripping voltammetry (ASV). Recoveries of lead were determined from wipe materials which were spiked with certified reference materials (CRMs) containing known quantities of lead. Four different wipe materials and four different CRMs were tested, with and without filtration of aliquots of sample extract through 0.45 microm hydrophilic polytetrafluoroethylene filters. The CRMs consisted of paint, soil, particulate, and dust matrices. Wipe materials were chosen from those which have been found to meet the performance aspects of an ASTM standard specification. UE/ASV experiments were carried out in accordance with newly published ASTM procedures for on-site extraction and electroanalysis. Recoveries were found to vary for different wipe materials and CRMs. For several CRMs, quantitative (80--120%) recoveries for UE/ASV were observed for one wipe material whether filtration was used or not, while other wipe materials required filtration for quantitative recovery. In the case of one wipe material which contained detergents, quantitative recoveries could not be achieved whether filtration was used or not. The total analysis time for a sample set of 6--12 samples was 60--90 min, including extraction time and sample manipulation. The results of this work have provided information on the choice of wipe materials that can be used for quantitative lead measurements by UE/ASV in materials that are representative of sources of lead in surface dust.     

Giant Seebeck coefficient thermoelectric device of MnO2 powder

We report a giant Seebeck coefficient (S) thermoelectric (TE) material-MnO(2) powder-and the design of a practical MnO(2) TE generator to light up a regular light emitting diode (LED). The S of MnO(2) powder was measured to be higher than 20,000 μV K(-1), which is about 100 times higher than the state-of-the-art of Bi(2)Te(3), one of the best TE materials. The giant S is very possibly closely related to the surface density of the electronic state (DOS), the Fermi energy level. The very high S and therefore high power factor is technologically important for transient TE cooling.     

The characterization of a cascade thermoelectric cooler in a cryosurgery device

An experimental investigation using a Peltier thermoelectric cooler (TEC) to cool down a cryoprobe for cryosurgery was performed. Two prototypes of cryosurgery devices consisting of 5- and 6-stage TEC modules were analyzed using a variety of electrical voltages, circulating thermostatic bath (CTB) temperatures, and heat exchanger configurations to obtain an optimum cold side temperature and temperature differences between sides of the modules. To increase the heat exchanges at the hot side, a heat pipe system with a water block was used. Using an electric voltage of 12 V and a CTB temperature of 273.55 K, a cryogenic temperature of 177.09 K and a temperature difference of 99.87 K were achieved. These results indicate that the TEC module can be an effective cooling source for cryosurgery. The prototype has shown potential for clinical trials.     

Rapid fabrication and thermoelectric properties of Sn1.03Te-based materials with porous configuration

Journal of Materials Science: Materials in Electronics - In this work, porous Sn1.03Te-based samples with and without 1 vol% K2Ti6O13 whiskers were prepared by applying a one-step spark plasma...     

On-line measurement of steel sheetr-value using magnetostrictive-type EMAT

An ultrasonic on-line system to measurer values in cold rolled steel sheets has been developed with electromagnetic acoustic transducers (EMATs). These EMATs are composed of meanderline coils and electromagnets and operate with the magnetostrictive mechanism. The EMAT instrument measures the propagation times of the fundamental symmetrical Lamb (S _o ) wave at a low frequency and relates them to ther values through a calibrated regression curve. Preliminary tests indicate that the on-line monitoring ofr is quite feasible with a standard deviation of 0.07 for various low carbon steel sheets; the thicknesses range from 0.5 mm to 2.5 mm. The measuring time is 20 msec per data. The liftoff is allowed to 5 mm with 2 mm thick sheet. Ther evaluation is independent of the line speed up to 325 m/min. These promising results promote installation of ultrasonicr-value measurement systems in steel production lines.     

Regulating oxygen levels in a microfluidic device

Microfluidic devices made from poly(dimethylsiloxane) (PDMS) are gas permeable and have been used to provide accurate on-chip oxygen regulation. However, pervaporation in PDMS devices can rapidly lead to dramatic changes in solution osmotic pressure. In the present study, we demonstrate a new method for on-chip oxygen control using pre-equilibrated aqueous solutions in gas-control channels to regulate the oxygen content in stagnant microfluidic test chambers. An off-chip gas exchanger is used to equilibrate each control solution prior to entering the chip. Using this strategy, problems due to pervaporation are considerably reduced. An integrated PDMS-based oxygen sensor allows accurate real-time measurements of the oxygen within the microfluidic chamber. The measurements were found to be consistent with predictions from finite-element modeling.     

Features of the measurement of current strength by a thermoelectric transducer

The problem of measuring a pulsed current using a thermoelectric transducer is considered. It is not possible to measure all currents by direct reading from a thermoelectric transducer. The measurement of some currents requires the use of appropriate coefficients. Translated from Izmeritel'naya Tekhnika, No. 2, pp. 38–39, February, 1999.     

湿度自动测量装置

本文阐述了采用可编程控制器(PLC)对湿度进行测量的原理，并对其硬件组成和软件结构作了详细的介绍。在软件编制中运用了一些新颖的算法，以提高运算的精度。