Ti3Al对TiCu15Ni15钎料组织的影响

分别以0％，25％，50％，75％，100％比例的Ti3A1替换TiCu15Ni15中Ti，对所得的钎料进行组织形貌及成分分析。研究结果表明：钎料合金由先结晶低Cu，Ni含量相和后结晶的高Cu，Ni含量相组成，随TiaAl增加。低Cu，Ni含量相减少，高Cu，Ni含量相增加，同时由于Nb含量增加，背散射图像发生变化，先结晶相由灰色逐渐变为亮白色，后结晶相成分偏析增加，先结晶高Nb相为灰色，后结晶低Nb相为黑色，至5^#合金形态发生显著变化，灰色相由块团状变为短条或片状，其中央为白色边缘为灰色，这将引起性能变化。     

Synthesis and red electrophosphorescence of a novel cyclometalated iridium complex in polymer light-emitting diodes

The preparation and characterization of a new cyclometalated iridium complex with 2-(1-naphthalene) pyridine ligand were reported. An electrophosphorescent device was fabricated by using this new iridium complex as guest and poly-(cyano-paraphenylene) as host. Red electrophosphorescence was observed with an emission peak at approximately 600 nm. An external quantum efficiency of 1.3% was achieved in this electrophosphorescent polymer light-emitting devices.     

U2000超声波流量计及应用

本文主要概述了U2000型超声波流量计原理、安装要求及其特点和应用.     

农村配电网自动化系统建设模式的研究及应用

阐述了农村配电自动化系统的建设模式、系统配置、主站方案选择与通讯,探讨了系统在配电可靠性、无功优化等方面的应用情况,并提出了利用该系统防止窃电的新技术。     

3-D transient numerical simulation on the process of laser cladding by powder feeding

A 3-D transient mathematical model for laser cladding by powder feeding was developed to examine the macroscopic heat and momentum transport during the process, based on which a novel method for determining the configuration and thickness of cladding layer was presented. By using Lambert-Beer theorem and Mie‘s theory, the interaction between powder stream and laser beam was treated to evoke their subtle effects on heat transfer and fluid flow in laser molten pool. The numerical study was performed in a co-ordinate system moving with the laser at a constant scanning speed. A fixed grid enthalpy-porosity approach was used,which predicted the evolutionary development of the laser molten pool. The commercial software PHOENICS, to which several modules were appended, was used to accomplish the simulation. The results obtained by the simulation were coincident with those measured in experiment basically.     

Experiment research on grain drying process in the heat pump assisted fluidized beds

A heat pump assisted fluidized bed grain drying experimental system was developed. Based on this system, a serial of experiments was performed under four kinds of air cycle conditions. According to the experimental analysis, an appropriate drying medium-air cycle for the heat pump assisted fluidized bed drying equipment was decided, which is different from the commonly used heat pump assisted drying system. The experimental results concerning the drying operation performance of the new system show that the averaged coefficient of performance (COP) can reach more than 2.5. The economical evaluation was performed and the power consumption for removing a kilogram water from grains was about 0.485 kW·2222h/kg (H2O), which shows its reasonable commercial efficiency and great application potentiality in future market.     

Dielectric Properties of B2O3 Doped MgTiO3-CaTiO3 System Ceramics

The dielectric ceramics with a main crystal phase of MGTiO3 and additional crystal phase of CaTiO3 were prepared by the conventional electronic ceramics technology .the strucures of MgTiO3 are ilmenitetype,and belong to hexagonal syngony.the ratio of MgTiO3 to Ca TiO3 doping on the dielectric properties of MGTiO3-CaTiO3(MCT)ceranics were inrestigated.the addition of B2O3 decreases the sintering temperatnre and results in rapid desification without obrious negative effect on the Q values of the system(Q=1/tan ).B2O3 exists as liquid phase in the sintering process,promoting the reactions as a singering agent.     

运用CRM系统完善企业业务流程

企业要想在激烈的市场竞争中立于不败之地,就必须实施客户关系管理,运用CRM系统,简化业务流程,加强客户交流,实现客户价值最大化,为企业赢得更多的客户和保留最好的客户,从而扩展企业的赢利空间。     

Effects of Powder Feeding Rate on Interaction between Laser Beam and Powder Streamin Laser Cladding Process

A theoretical model was presented to calculate the laser intensity distribution and the particle temperatures at different sites of the workpiece in the laser cladding process By using this model, the effects of the powder feeding rate on the laser intensity distribution and the particle temperatures were inrestigated ,the caleuluted results under the condition of different injection angles were also plotted it is shout that with increasing the injection angle,the laser inuensity distributwons are similar but the peak ralue of the laser intensity decreases simdlaneously the peak ralue of the particle tenperature increases and the disribution of the particle temperatures gets central symmetrical gradually.these tests reslts should be considered in model of laser cladding due to their sub the effects on the dynamic processes in laser molten pool.     

基于JMX的移动业务平台OAM系统设计

针对构建于J2EE(Java 2企业版)分布式平台之上的电信级移动业务开发环境,研究能满足电信级和企业级(J2EE平台)管理要求的技术架构,提出了一种基于JMX(Java管理扩展)框架的操作和维护管理系统的设计方案,并提出了在多J2EE服务器情况下操作和维护管理系统的一个扩展框架.