综合公建项目机电大型设备吊装技术

作为大型公建项目机电安装工程的一个重要组成部分,机电大型设备的进场组织及吊装运输尤为关键。本文结合某项目实施的实际经验,就设备吊装的全过程进行了总结分析。     

移动网络工程项目风险管理

一．建设工程项目的风险分析 建设工程项目的风险包括项目决策的风险和项目实施的风险,项目实施的风险主要包括设计风险、施工的风险以及材料、设备和其他建设物资的风险等。建设工程项目的风险类型有多种分类方法．以下就构成风检的因进行分类。     

创建维修电工中级实训教学实施条件

根据本校的维修电工中级实训教学实施的过程,从硬件设备方面和软件方面加以阐述,在软件配备了方面从教师、学生、教材三方面详细阐述的怎样创建维修电工中级实训项目教学实施的条件、并确立维修电工中级实训项目。     

杭氧全力推进12万m~3/h等级空分设备项目的实施

<正>自2010年12月31日12万m3/h等级空分设备的技术附件和商务合同正式签订以后,杭氧股份有限公司上下十分重视这个特大型空分设备项目,销售、技术、质量等部门集中力量推进这个项目的实施。专门成立了12万m3/h等级空分设备项目领导小组和执行小组,并按照分工设立了设计、生产、制造、项目执行等4个团队,从组织和执     

通信设备企业的项目管理模式探讨

面对通信设备市场高速成长和竞争的日益加剧,通信设备企业需要不断提升企业的核心竞争力。本文分析了现有通信项目管理模式的不足之处,提出适合通信产品设计、生产的中继式项目管理模式(RPMM),并探讨了其实施方式及需要控制的四个方面:质量控制、进度控制、成本控制和信息控制。     

读解2010版信息技术及音视频设备CCC认证实施规则

本文介绍了2010版信息技术和音视频设备CCC认证实施规则与2007版信息技术和音视频设备CCC认证实施规则的差异,并对其中变化最大的A、B炎关键元部件和材料的变更程序和A、B类关键元部件和材料对应的检测项目确定进行详细读解和探讨。     

电力通信设备状态检修实践和探索

在电力系统大力推广状态检修的形势下,结合电力公司通信设备特点,从组织领导、健全技术体系建设、资料与信息收集、科学实施、培训与宣贯等方面进行了通信设备状态检修的实践。文章阐述了电力通信实施状态检修的意义和作用,分析了通信设备状态检修的关键点,列举了成效与收获,提出通信设备状态检修要挖掘适用的检验监测方法、细化检修项目和周期内容,采用PDCA循环闭环控制,使电力通信设备的状态评价方式更加科学。     

大型项目的配置管理

2008年3月,本人有幸参与了某生产企业“信息系统项目”的建设,该项目总体分为网络系统扩建、企业门户建设、物料移动系统、人员设备质量管理系统、成本计量管理系统和生产优化管理系统6部分,分三个阶段实施建设。一阶段完成网络系统扩建：实时数据采集、视频监控系统建设。二阶段实施物料移动系统：企业门户建设：生产平衡动态优化系统的建设。三阶段实施人员、设备、质量综合管理系统：成本计量管理系统的建设。     

国内项目总承包发展模式的探讨

所谓项目总承包管理是指业主将工程建设任务发包给专门从事项目组织管理的单位,再由它分包给若干设计、施工和材料设备供应单位,并在实施中进行项目管理。近年来在工程建设领域内大力推行项目管理,在提高项目质量、缩短建设周期、节约建设资金等方面取得了明显成效。     

探索电力通信工程设备状态检修策略

本文阐述了电力通信实施状态检修的意义和作用，分析了通信设备状态检修的要点，然后提出通信设备状态检修的方略，列举了成效与收获，最后指出要挖掘适用的检验监测方法、细化检修项目和周期内容等等，使电力通信设备的状态评价方式更加科学。     

Diffusion bonding of ferritic oxide dispersion strengthened alloys to austenitic superalloys

The superior high temperature mechanical strength and oxidation resistance of ferritic oxide dispersion strengthened (ODS) tubular alloys are compromised by the difficulties encountered in joining. Conventional fusion welding techniques generate a weld fusion zone which is devoid of the mechanical strength exhibited by the base material. Therefore, more sophisticated solid state joining techniques, such as diffusion bonding, must be employed when joining ODS materials. This paper describes a series of solid state diffusion bonding experiments carried out between two tubular ferritic ODS alloys and two high temperature austenitic alloys. Careful control of bonding conditions produced pressure retaining joints between one of the tubular ODS alloys and both austenitic alloys. The successful joint design was incorporated into the manufacture of a tubular creep component, which enabled a series of internally pressurized creep tests to be carried out. The microstructure developed at the bond interface of each of the four separate material couples is described and the high temperature performance of the pressure retaining joints is discussed.     

Sol-gel open tubular ODS columns with reversed electroosmotic flow for capillary electrochromatography

Sol-gel chemistry was successfully used for the fabrication of open tubular columns with surface-bonded octadecylsilane (ODS) stationary-phase coating for capillary electrochromatography (OT-CEC). Following column preparations, a series of experiments were performed to investigate the performance of the sol-gel coated ODS columns in OT-CEC. The incorporation of N-octadecyldimethyl[3-(trimethoxysilyl)propyl]ammonium chloride as one of the sol-gel precursors played an important role in the electrochromatographic performance of the prepared columns. This chemical reagent possesses a chromatographically favorable, bonded ODS moiety, in conjunction with three methoxy groups allowing for sol-gel reactivity. In addition, a positively charged nitrogen atom is present in the molecular structure of this reagent and provides a positively charged capillary surface responsible for the reversed electroosmotic flow (EOF) in the columns during CEC operation. Comparative studies involving the EOF within such sol-gel ODS coated and uncoated capillaries were performed using acetonitrile and methanol as the organic modifiers in the mobile phase. The use of a deactivating reagent, phenyldimethylsilane, in the sol-gel solution was evaluated. Efficiency values of over 400,000 theoretical plates per meter were achieved in CEC on a 64 cm x 25 microm i.d. sol-gel ODS open tubular column. Test mixtures of polycyclic aromatic hydrocarbons, benzene derivatives, and aromatic aldehydes and ketones were used to evaluate the CEC performances of both nondeactivated and deactivated open tubular sol-gel columns. The effects of mobile-phase organic modifier contents and pH on EOF in such columns were evaluated. The prepared sol-gel ODS columns are characterized by switchable electroosmotic flow. A pH value of approximately 8.5 was found correspond to the isoelectric point for the prepared sol-gel ODS coatings.     

Microstructure and Mechanical Behavior of Mechanically Alloyed ODS Ni-Base Superalloy for Aerospace Gas Turbine Application

The gamma prime precipitation strengthening behavior and oxide dispersion strengthening behavior of mechanically alloyed oxide dispersion strengthened (ODS) Ni-base superalloys have been investigated. The most important microstructural feature affecting the elevated temperature strength of ODS alloys was found to be the grain aspect ratio. Grain aspect ratio after zone annealing was sensitively related to the primary grain size in as-extruded Ni-base superalloy. There was a suitable range of primary grain size to obtain a coarse elongated grain structure after zone annealing. The large grain aspect ratio above a critical value of about 20 resulted in an increase in stress-rupture life more than two orders of magnitude at 950°C. The size and distribution of the gamma prime precipitates were dependent on the solution heat treatment conditions. The microstructural parameters on the gamma prime precipitates significantly affected on the stress-rupture property of ODS Ni-base superalloy at the intermediate temperature range.     

R22的替代问题及其探索与研究

臭氧层破坏仍是当前国际社会面临的主要环境问题之一,《蒙特利尔议定书》再次加速了ODS物质的淘汰和禁用,本文介绍R22的一些替代研究方案及其应用情况。     

Scaling the Operating Deflection Shapes Obtained from Scanning Laser Doppler Vibrometer

Operating Deflection Shapes (ODS) has emerged as one of the powerful techniques in vibration analysis to understand and to evaluate the absolute dynamic behaviour of a machine, component or an entire structure. Traditionally, accelerometers have been used to get the ODS of a structure. However, recent development shows that certain situation may not allow direct contact with the structure under investigation. Therefore, Scanning Laser Doppler Vibrometer (SLDV) has become popular in the investigation. In this paper, a new ODS Frequency Response Function (ODS FRF) for investigations using SLDV is formulated. The ODS FRF is used to construct the ODS of the structure. A new form of scale factor for the ODS FRF is also introduced to normalize the effects from variable excitation force. The importance of this scale factor is demonstrated on a beam and plate under the excitation of varying forces. It is found that the suggested ODS FRF and the scale factor give the desired result in comparison with theory.     

Trapping of bead-based reagents within microfluidic systems: on-chip solid-phase extraction and electrochromatography

A 330-pL chromatographic bed was fabricated on a glass substrate as part of an electroosmotically pumped microfluidic system. Two weirs within a sample channel formed a cavity in which octadecylsilane (ODS) coated silica beads (1.5-4 microns diameter) were trapped. ODS beads were mobilized into and out of the cavity using electroosmotic flow through a bead-introduction channel which accessed the cavity. This procedure allowed the beads in the cavity to be repeatedly exchanged. A 1 nM solution of a nonpolar analyte (BODIPY 493/503) in buffer was loaded onto the beads for different lengths of time using an electroosmotic flow of 1.2 nL/s. The material retained on the ODS phase was then eluted by electroosmotic flow of acetonitrile with a concentration enhancement of up to 500 times. Capillary electrochromatography was conducted using a similar device. BODIPY and fluorescein were loaded onto a 200-micron-long chromatographic bed and then separated in an isocratic CEC run with an acetonitrile/buffer mobile phase. Complete separation was achieved in less than 20 s with a 2-micron plate height.     

High temperature isothermal oxidation behaviour of an oxide dispersion strengthened derivative of IN625

Abstract

Gas atomised IN625 powder was mechanically alloyed with <1·0 Wt.% nano-yttria and consolidated by spark plasma sintering (SPS) to produce an oxide dispersion strengthened (ODS) alloy. The isothermal oxidation rate constant of the ODS alloy, and wrought IN625, was determined by thermogravimetric analysis. This was performed at 900 °C in static laboratory air for exposure times of up to 1000 h. It was found that the ODS alloy oxidised ~40x slower than wrought IN625, which is attributed to the reactive element effect. It is further proposed that the improvement in oxidation resistance of the ODS alloy, and the superior morphology of the oxide scale formed on the ODS alloy, may be related to the presence of Nb carbide, rather than δ-phase, in the ODS alloy.     

球磨时间对镍基ODS合金拉伸性能的影响

研究了球磨时间对Y2O3氧化物弥散强化(ODS)镍基高温合金机械合金化和拉伸性能的影响.镍基高温合金采用机械合金化和热压烧结方法制备.镍基ODS高温合金粉末是在行星式球磨机上进行球磨.采用扫描电镜及X射线衍射分析了球磨时间对镍基ODS合金粉末形貌和物相的影响.研究结果表明,Y2O3氧化物弥散强化镍基高温合金机械合金化粉末尺寸随研磨时间的增加先增大后减小,8h粉末颗粒尺寸达到最大,之后粉末颗粒尺寸逐渐减小,28h后,镍基ODS合金粉末尺寸稳定且均匀.拉伸结果表明,采用研磨28h的合金粉末制备的镍基ODS合金具有最高的抗拉强度(1300MPa).     

基于ODS FRF某城际车工作状态下模态贡献分析

为研究某城际车工作状态下模态贡献问题，首先用激振器对该城际车进行了静态台架实验，利用LMS. Test. Lab软件识别其模态参数。然后对该城际列车进行线路实验，测试其不同速度级下的加速度振动响应。根据ODS FRF概念，给出了城际车在ODS FRF包络曲线峰值处的工作变形。最后根据模态叠加原理，得出不同速度级下，该城际车不同频率下工作变形主要由车体沉浮、车体点头及车体1阶垂弯贡献的结论。同时结果显示，不同速度级下，同一频率下工作变形可能由不同固有模态贡献；不同速度级下，同一工作变形频率可能会发生偏移。     

ODS钢研究进展及其在核电领域的应用现状

氧化物弥散强化钢(Oxide Dispersion Strengthened Steel, ODS钢),具有优异的力学性能、高温稳定性及抗辐照性能.本文概要地综述了机械合金化、热等静压固化成形、等离子烧结及转角挤压等ODS钢的制备方法,总结了微观组织及结构对ODS钢性能的影响规律及影响机制,又综述了合金元素对ODS钢性能影响的相关研究进展;并对ODS钢在核电领域中的应用及相关研究进展进行了概括,介绍了激光技术在ODS钢制备及加工领域的应用,讨论了ODS钢在核电环境服役过程中存在的主要问题及进一步的研究方向,为核电站的安全运行提供有力的参考依据,对于核电材料的创新发展具有一定的参考作用.