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制药生产企业广泛采用组合式净化空调机组对送入洁净区的空气进行净化处理。本文介绍组合式净化空调机组的结构和工作原理;为保证产品质量,从该机组的选购、安装、检查、维护四方面探讨了净化空调机组的管理方法。(山东新华制药股份有限公司,山东淄博255005) 相似文献
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研究了在交变磁场作用下电源功率、净化时间、不同管径等参数对Al-24%Si过共晶合金净化效果的影响。结果表明:随着电源功率的加大、净化时间的加长和管径的减小,净化效果逐渐变佳;处于工作线圈端口的铝熔体发生了末端效应;被分离出去的初生硅会在分离器壁合并,并逐渐向铝熔体内长大,这种长大机制影响了净化效果。当管径为10mm,电源功率为10kW时,这种长大机制得到了抑制,并在30s时得到了较佳净化效果。 相似文献
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铝熔体高效净化的理论及净化处理技术的现状分析 总被引:2,自引:0,他引:2
铝熔体中Al2O3夹杂与氢的行为及相互作用关系的实质,是改善和提高铝液净化效果的理论基础,对于铝液净化工艺的合理设计极为重要。本文从这一关键入手进行分析讨论,提出杂气相互作用的“寄生机制”观点;同时针对目前净化方法主要从除气角度进行设计,忽视杂气相互关系及对净化效果的影响等现状,在杂气关系分析的基础上,突破传统净化思路的束缚,提出“排杂是除气的基础,排杂为主、除气为辅”的铝液净化原则,据此研究开发出熔剂过滤净化方法及相应的高效排杂净化熔剂,同时分析讨论了国内外净化处理技术的发展现状及存在问题,并指出提高铝熔体净化效果的技术途径。 相似文献
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在工业化生产型真空感应炉中,对单晶高温合金DD3返回料净化技术进行研究,在国内首次用电子束纽扣法测定夹杂数量,并对净化后的返回料锭和常规工艺生产的返回料锭在纯净度、化学成分、力学性能等方面进行了对比。结果表明:与常规工艺相比,净化技术显著降低返回料中的氧化夹杂含量,净化后100%返回料锭的[O]、[N]含量和力学性能均能达到标准要求。 相似文献
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润滑油与液压油是润滑和液压系统的血液,因此油品净化的重要性越来越显著。为了实现对油品净化设备的综合管控、全优润滑,其至佳方案的研究势在必行。将物联网与区块链技术相结合,以物联网的智能控制为依托,实现油品净化设备的自动控制;以区块链技术的共识机制和分布式数字存储模块为补充,解决物物相连的设备之间协作与安全问题。最终实现物联网的共识机制和分布式网络,对分散的各主体设备油站以及分散布置的油品净化设备的各数据参数进行实时测控、远程共享,从而实现润滑油与液压油的净化和全优润滑,降低设备损耗和故障率,提高设备寿命。 相似文献
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气体排放控制装置作为电解制氧子系统中的关键单机,其主要功能在于将电解制氧子系统产生的氢气和氧气实现自动排放。产生的氧气用于维持空间站内航天员在轨时的呼吸,产生的氢气需及时排出以保证系统安全性,气体排放控制装置需具备高可靠性、易维护、易更换的人机工效学要求,以保障空间站能够长期在轨运行。基于上述需求,设计了一种基于环控生保系统的气体自动排放控制装置,该装置包含氢气正常及备份排放支路、氧气正常及备份排放支路。通过力学仿真及力学试验、流量仿真及流量试验,验证了模块化设计的气体排放控制装置的力学、流量等关键指标均满足要求,同时重量比指标要求降低20%,实现了产品的轻量化、小型化设计,对未来类似的集成化组件设计具有一定的借鉴与指导意义。 相似文献
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A nontraditional, portable flame atomic emission spectrometry (FAES) device has been constructed using a welding industry metal cutting torch as the flame source with a tungsten coil electrothermal vaporization device for sample introduction. Twenty-microliter sample aliquots were pipetted onto a commercially available tungsten filament, and a home-written Visual Basic program was used to automatically dry and atomize the sample. The sample was then transported into the heart of the air-acetylene flame, where it was excited, and the resulting emission signal was focused onto the entrance of a miniature charge coupled device spectrometer. Figures of merit were determined for five alkaline and alkali earth metals of biological and environmental significance. Limits of detection were, on average, 100 times lower than those for traditional flame emission spectrometers. The capabilities of this portable device make it an ideal tool for biological field analysis, particularly in areas where traditional laboratories are inaccessible. 相似文献
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针对废旧轿车无级变速箱再制造工艺碳排放问题,提出了一种多层次关联分析理论与碳排放系数法相结合的再制造工艺碳排放量化方法。对无级变速箱再制造工艺过程的碳排放特性进行分析,定义了再制造工艺系统边界,将系统内多种碳源进行归类分析,构建了多层次碳排放要素之间的关联矩阵,并结合碳排放系数法进行基本碳源建模,提出无级变速箱再制造工艺碳排放量化方法。基于碳排放评估的角度对无级变速箱的再制造工艺进行研究,并以带轮盘激光修复工艺为例,验证了所提出碳排放量化方法的有效性。实验结果表明,在无级变速箱带轮盘激光修复工艺过程中,设备碳排放是总碳排放的主要组成部分,相比于其他碳排放影响因素,扫描速度对设备碳排放以及总碳排放的影响程度最大。 相似文献
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Nanomaterials for field electron emission: preparation,characterization and application 总被引:6,自引:0,他引:6
We review the current development in synthesis and deposition techniques of quasi-one-dimensional nanomaterials and recent achievements in the study of the field electron emission properties of these materials. Major findings are given from our recent experimental study of the field electron emission characteristics of carbon nanotubes, copper sulfide and silicon carbide nanorods. The study reveals that the above nanomaterials are promising candidates as cold cathode electron emitters. Furthermore, we review the recent development of techniques for growing and depositing the above nanomaterials in device structures. Typical device structures and their performance are also shown. 相似文献
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某型号导弹发射车跟踪与发射性能检测过程中,传统手段存在效率低、成本高的缺点。在充分论证该型号导弹发射车跟踪与发射性能测试需求的基础上,采用FPGA、视频信号合成等先进技术,运用电子目标生成以及信号采集分析等方法,设计了一套新型检测设备,实现了跟踪与发射性能检测工作的自动化,提高了检测效率,节约了检测成本。 相似文献
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Zając S Rzadkiewicz J Rosmej O Scholz M Yongtao Z Gójska A Paduch M Zielińska E 《The Review of scientific instruments》2010,81(10):10E312
Soft x-ray emission from a Mather-type plasma-focus device (PF-1000) operated at ~400?kJ was measured. The high density and temperature plasma were generated by the discharge in the deuterium-argon gas mixture in the modified (high-current) plasma-focus configuration. A spherically bent mica crystal spectrograph viewing the axial output of the pinch region was used to measure the x-ray spectra. Spatially resolved spectra including the characteristic x-ray lines of highly ionized Ar and continua were recorded by means of an x-ray film. The x-ray emission of PF-1000 device was studied at different areas of the pinch. 相似文献
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Characterization of a high voltage flat panel display unit using nanotube-based emitters. 总被引:1,自引:0,他引:1
Details are given of an experimental investigation carried out to study the field electron emission characteristics of a field emission flat panel display unit using a carbon nanotube-epoxy composite as electron emission material. These include: (i) dependence of direct emission current-voltage characteristic on vacuum gap spacing, (ii) the variation of the proportion of emission current passing through an aperture hole of a gate electrode with changing structural parameters of the device, and (iii) the uniformity and display characteristics of a typical display unit. Our findings indicate that it is very likely for one to produce a near-market prototype high voltage field emission flat panel display, if more sophisticated fabrication and assembly technique is adapted. 相似文献