密闭无泄漏高炉探料尺的设计

高炉探料尺是了解高炉内料位高低的必不可少的设备,笔者在为钙镁高炉探料尺的设计中,经过反复多次的实践、修改、完善后,终于达到了相当满意的境地,有着推广应用的价值。     

钙镁高炉探料尺与自整角机传动装置的设计

一、前言在高炉法生产钙镁磷肥中需要随时了解高炉中料位的变化情况,从而掌握正确的加料时间,为此,我们一方面采用顺指比例探料尺在卷扬机房现场直观指示(见“化工设备设计”一九八五年第五期),这是一种安全、方便、可靠的指示。另一方面又采用仪表集中控制,需要应用自整角机,它是一种一次仪表与二次仪表联合使用的仪器,一次仪表与探料尺传动装     

一种新型数字料位仪的诞生

近期,一种新型数字料位仪在山东临朐水泥自动化仪器厂投入生产。本产品是用9段式料位探极配套构成的。可用于大、中、小型料筛内物料料位的自动监控。由于探极具有多种材料和结构形式,因此可广泛用于各种介质粉体物料的监控。(如粮食、化工、水泥、建材)本仪器是根据国家发明专     

焦炭料位指示简易装置

焦炭贮仓中由于物料颗粒大,容易砸坏料位探极,因此,目前还没有显示焦炭位置的指示器.我们在工作中利用焦炭导电的原理,制作了简易的料位装置,它能直观地显示出焦炭的准确位置,其原理简单,使用效果较好.     

料仓高料位检测装置的选型与比较

在总结料仓工作高料位和极限高料位报警装置的设置及使用效果的基础上，简要地介绍几种料仓高料位检测装置的性能并经过比较，作出最佳选择。     

炭黑粉料罐料位测量的改进

炭黑粉料罐原设计采用阻旋式料位计测量料位，分上、中、下限报警，但在使用中由于炭黑粉尘结垢等原因经常出现料位显示失灵，造成虚假料位。改用称重法测量料位，不仅较好地解决了粉料罐料位的测量，而且还能做到连续测量。     

简易料位开关的制作与作用

１制作原因水泥包装机灌装时需要中间仓内有足够的水泥，但是不容许水泥从仓内溢出或不足。包装机厂家在提供系统时中间仓上安装了刀片式料位开关，使用不到半年其上刀片就断掉了，粒位开关失去了作用。我们又根据资料介绍选择安装了UKZ－１型电容式音叉料位开关，但使用不久音叉中间粘结了水泥，料位开关又失去作用，造成操作人员无法控制仓内水泥量，经常导致中间仓溢料。因此，我们自制了简易料位开关，解决了包装机系统中间仓内料位的控制问题。２料位开关的制作２．１料位开关壳体的制作如图１所示，料位开关壳体由上法兰、胶皮薄膜…     

优化整改麦尔兹窑机械探尺

介绍了韶钢焙烧厂麦尔兹窑机械探尺提升过程中出现卡住,造成频繁停窑的现象。经过优化后,机械探尺运行正常,为麦尔兹窑安全、稳定顺行生产提供了良好的条件。     

TSD型电容式料位控制器的高温环境下应用改造

电容式料位控制器在我公司主要应用于各种料仓、料库、堆场及篦冷机下料控制用，对粉状及固体物料进行连续的料位监测和控制。１问题的提出在我厂第二条４０００t／d水泥熟料生产线上，控制篦冷机下料共用了３４台TSD型电容式料位控制器，主要利用料位控制器的输出信号控制电动机带动挡板开合，以达到自动下料并保证篦冷机内正压的目的；由于料斗内熟料的温度很高，直接影响到转换电路部分，使电子元器件很不稳定，灵敏度经常需要调整，而且经常出现转换电路板烧坏、烧毁现象，致使料位控制器频繁调整、更换转换电路板，影响了生产的稳定…     

一种自制磁控料位仪

在水泥生产过程中，需对料仓料位进行检狲和控制。笔者在厂散装站加仓增容的技改项目中，为了降低成本，自行研制了一种磁控料位仪，投入使用后，证明有较高的灵敏度和可靠性。现介绍如下。1磁控料位仪的工作原理根据干簧管磁敏特性的特点，利用物料积骤向周边松散时所产生的料位压力，通过变位膜，将磁头移至干簧管，使干簧管触点闭合，电路导通。电笛和指示灯发出声光报警信号，指令人工或者自动停止进料，达到控料仓料位的目的。2磁控料位仪的机械结构磁控料位仪的机械结构主要由下列部件组成：变位膜、法兰支架、环形法兰、磁头滑杆。变…     

Diamond photoconductors: operational lifetime and radiation hardness under deep-UV excimer laser irradiation

The first study of long term pulse exposure and fluence level on the performance of CVD diamond photodetectors subjected to 193 nm excimer laser radiation has been performed. Whilst diamond is considered ‘radiation hard’ it is shown that damage to detector performance can be provoked at laser fluence levels considerably below that required for graphitisation or ablation. However, the application of defect passivation treatments prior to device use acts to considerably reduce the damaging effect of the radiation, such that devices suitable for stable laser monioring applications can be realised.     

Diamond photodetector response to deep UV excimer laser excitation

Diamond photoconductive detectors have previously been shown to be suitable for detection of deep ultraviolet nanosecond-scale pulses from excimer lasers, which are to be used in next generation lithographic systems. Using simple test circuitry and low bias voltages easily measurable responses were observed when these detectors were illuminated with laser pulses at typical laser fluence levels. However, as the laser fluence is increased the detector response appears to broaden and change shape as well as increase in magnitude. In this paper we present analysis of the response of these detectors. This analysis shows that over the laser fluence range used the magnitude of the detector response exhibited a linear response. By approximating the temporal evolution of the laser pulse and simulating the transfer characteristics of the test circuit it can be seen that the pulse broadening and shape change seen with increasing fluence can be explained by the test circuit. The shape of the detector response, therefore, closely resembles the temporal shape of the laser pulse, demonstrating that these devices are fast enough to give a true representation of 10–15 ns laser pulses at a wavelength of 193 nm.     

毛细管电泳激光诱导荧光法检测多酶片中四种生物酶

通过基于电荷耦合装置的在线自校正激光诱导荧光检测装置,使用毛细管电泳法同时分离检测了异硫氰酸荧光素(FITC)标记的多酶片样品中4种生物酶,根据FITC标记血红蛋白含量的减少评价胃蛋白酶的活力。结果表明,毛细管电泳激光诱导荧光检测法可以分离检测生物药品中的活性成分,胃蛋白酶活性评价方法,可作为药典方法的补充。     

血红蛋白类红细胞代用品理化性质的色谱分析

目的 建立血红蛋白类红细胞代用品的色谱分析方法。方法 通过高效液相系统与二极管矩阵检测器、多角度激光散射检测器和蒸发光散射检测器进行组合,检测聚乙二醇(PEG)化牛血红蛋白(PEG-bHb)的色谱纯度、相对分子质量分布和磷脂含量。结果 PEG-bHb为多位点不均一修饰的混合物,数均相对分子质量为1.211×10~5,重均相对分子质量为1.347×10~5,残余磷脂含量低于1μg/ml。结论 色谱分析方法是进行血红蛋白类红细胞代用品理化性质分析的适宜方法。     

新型微光探测器滤光玻璃

系统分析了微光探测器的结构及其原理。鉴于当前器件存在的激光致盲威胁,提出了新的改进思路。着重介绍了具有特殊激光防护性能的滤光材料,并对其原料及制备、加工过程作了系统地介绍,同时给出了一些重要的性能特征。     

Femtosecond laser irradiation-induced infrared absorption on silicon surfaces

The near-infrared (NIR) absorption below band gap energy of crystalline silicon is significantly increased after the silicon is irradiated with femtosecond laser pulses at a simple experimental condition. The absorption increase in the NIR range primarily depends on the femtosecond laser pulse energy, pulse number, and pulse duration. The Raman spectroscopy analysis shows that after the laser irradiation, the silicon surface consists of silicon nanostructure and amorphous silicon. The femtosecond laser irradiation leads to the formation of a composite of nanocrystalline, amorphous, and the crystal silicon substrate surface with microstructures. The composite has an optical absorption enhancement at visible wavelengths as well as at NIR wavelength. The composite may be useful for an NIR detector, for example, for gas sensing because of its large surface area.     

管道高温壁面辐射对激光测量天然气含水量影响分析

天然气含水量影响管道输送品质及输送安全,非接触激光检测作为目前气体浓度测量的主要方式之一,已被广泛应用。针对激光检测过程中存在高温壁面杂散辐射问题,设计了管输天然气含水量激光在线检测光路,利用TracePro光学仿真软件模拟管道壁面高温杂散辐射对探测器接收信号的影响,并基于光谱吸收原理分析该过程的光学特性。研究结果表明,在激光检测管输天然气含水量过程中,存在较为明显的杂散辐射,且在高温环境下,杂散辐射影响更为强烈。     

Flow‐injection polymer analysis of styrenic block copolymers. II

A flow‐injection polymer analysis (FIPA) method for the dilute solution characterization of unsaturated styrenic block copolymers was developed. The method is rapid, works with both butadiene and isoprene comonomers, and covers a range of 0–100% styrene content in the polymer. Solutions of the polymer were introduced into a flowing mobile phase and monitored by an array of three close‐coupled detectors: a right‐angle laser light‐scattering unit, a differential refractive index detector (DRI), and a differential pressure viscometer. In addition, a separate, dual‐detector instrument was set up specifically to evaluate the styrene content by the FIPA method. In that case, the detectors were a DRI and an ultraviolet detector. Within an analysis time of a few minutes, information on molecular weight, molecular size, and comonomer composition could be obtained directly. The data were compared to those obtained from a preexisting gel permeation chromatography analysis method. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2190–2201, 2002     

Triplet State Interrogation in Supersonic Beams by Surface Electron Ejection

Recently, we have developed an experimental method for the detection of triplet states generated by laser excitation in supersonic beams. It is based on electron ejection from low work-function surfaces by metastable triplet states. We have detected both directly laser-excited triplets and triplets generated via intersystem crossing from laser-excited singlet states. Here, we review the applications of this method and discuss its mechanism. By comparing the laser-induced fluorescence (LIF) spectrum and Surface Electron Ejection by Laser-Excited Metastables (SEELEM), we have measured relative triplet formation quantum yields for several aromatic compounds. By utilizing a detector mounted on a translational stage, we could vary the distance between the pulsed laser excitation and the detector and measure the decay rates of triplets in molecular beams. The major advantage of the method is in extending the measurement of triplet lifetimes to the ∼ 1-ms range. The combination of LIF, SEELEM, and fluorescence quantum yields enabled us to discriminate between intersystem crossing and internal conversion in isoquinoline. SEELEM is now being utilized in studying the spectroscopy and the dynamics of directly laser-excited triplet states. Although the oscillator strength of the lowest triplet state of pyrazine is about 10⁻⁸, we have measured the spectrum and the decay rates of its various vibronic levels. Our results support the notion that surface Penning ionization is the mechanism of SEELEM. The detector is insensitive to vibrational energy (thus enabling the distinction between intersystem crossing and internal conversion). The detection sensitivity of triplets rises with the excess electronic energy and with the lowering of the surface work-function.     

油漆桔皮的测定原理,方法与评价

详细介绍了国际最新激光桔皮仪ＷＡＶＥＳＣＡＮ４８０６,及其测定原理、测定方法和数据处理应用。由于使用了先进的测试仪器,为解决和比较不同生产线、不同油漆、不同底材的桔皮状况提供了公正客观的材料。