用非氰抑制剂提高锌精矿质量的试验研究

用几种非氰抑制剂代替氰化钠在锌浮选中抑制硫化铁矿物,几组对比试验结果表明,浓缩糖蜜酒精废液抑制效果优于其它抑制剂.工业试验中,浓缩糖蜜酒精废液代替氰化钠作抑制剂,可使精矿含Zn由50.39%提高到52.33%,含Pb由1.55%降至0.9%,锌回收率由93.47%提高到94.13%,而且由于其无毒,因而使用安全、可避免对环境的污染.     

柔性含铅γ辐射屏蔽材料的制备及性能

从γ射线防护材料的研究现状和需求入手,制备了含MWCNTs和铅的核辐射防护材料并测试其机械及辐射防护性能.使用高剂量率的γ辐射对碳纳米管进行剪切使其功能化,以机械共混法为主要加工方法制备含短切碳纳米管的含铅EVA高分子树脂辐射防护型片材,基于高分子化合物的辐照交联原理,利用高能电子束加速器对复合材料进行辐照交联改性,通过拉伸测试对成品的力学性能进行表征,通过辐射屏蔽实验测试成品的屏蔽性能,验证和探讨片材中加入短切后碳纳米管的改性原理、辐射屏蔽机理.所制备的γ射线辐射防护材料具有质轻、柔性、环境保护性及对伽马射线的较高质量衰减特性,能很好地满足防护效果与轻量便携的应用背景,对柔性辐射防护材料设计具有参考作用.     

建立基于GML3.0的WEBGIS系统

本文通过分析GIS系统的现状，提出基于Internet的WEBGIS系统从无到有的建立过程，该过程针对GML与SVG的特点，提出建立一种对应GML数据与SVG数据的映射关系i形成XSL样式表，通过XSLT引擎来解释这种关系，将GML数据转化成SVG图形，来解决GIS系统在WEB上发布的问题，同时展示了一个小型的具体实例，并提出了目前存在的问题及解决方向。     

收缩管/扩张管型无阀压电泵结构设计与分析

分析了收缩管/扩张管型无阀压电泵的工作原理,利用nuent软件模拟计算收缩管/扩张管型无阀压电泵的流体工作状态,并得出改变面积比与锥形角对静流量的影响.     

锚网索耦合支护在深部复杂岩巷施工中的应用

目前,平煤股份一矿已进入深部开采.随着矿井开采深度的增加,矿山压力明显,支护难度增大,而一矿所采用的锚网、锚索加固或套棚联合支护的加固方式效果不佳.在分析研究耦合支护理论的基础上,对三水平丁二轨道下山支护进行了研究,提出了支护方案.应用结果表明:该方案实现了深部复杂岩层支护结构上的祸合和巷道围岩稳定,支护效果明显,解决了大埋深复杂岩层施工支护难题.     

永磁同步电机稳态短路试验

通过对永磁同步电机(PMSM)稳态短路工况中短路电流和短路转矩进行理论分析,得到了PMSM稳态短路电流和电磁转矩的解析表达式。结合二维有限元法对某型号180 kW PMSM短路工况下的短路电流和短路转矩进行仿真分析计算,确定PMSM在稳态短路试验时短路电流、短路转矩随电机转速的变化规律。采用1台PMSM进行三相稳态短路试验验证,记录了短路试验时不同转速下的短路电流和短路转矩。对试验结果与理论分析、仿真分析结果进行对比分析,验证了短路电流、短路转矩随转速的变化规律。     

Multilayer piezoelectric ceramic transformer with low temperature sintering

The low-fired high performance piezoelectric ceramics used for multilayer piezoelectric transformer were investigated. Based on the transient liquid phase sintering mechanism, by doping suitable eutectic additives and optimizing processing, the sintering temperature of the quaternary system piezoelectric ceramics with high piezoelectric properties could be lower to about 960–1000°C. The low-temperature sintering multilayer piezoelectric transformer (MPT) has been developed. Some characteristics of MPT were systemically studied. The measurements include the frequency response of input impedance, frequency response of phase difference between input voltage and current, frequency shifting with load, input impedance changing with load, phase difference between input voltage and current shifting with load, and phase difference between input voltage and vibration velocity. The vibration modes and resonance characters of MPT were measured by a Laser Doppler Scanning Vibrometer. Several kinds of MPT with high voltage step-up ratio, high power density, high transfer efficiency and low cost have been industrially produced and commercialized. It reveals a broad application prospect for back-light power of liquid crystal display and piezo-ionizer etc.     

电缆接地故障定位与分析

介绍了电缆接地故障定位与分析,解决了电缆发生故障不易查找故障点的问题,为生产及供电企业快速准地查找故障点提供了可以借鉴的方法.     

国内压电陶瓷声马达的研究现状

综述了国内部分压电陶瓷声马达的研究发展情况,指出其产品开发所面临的困难,并提出今后需要进步解决的一些关键问题。     

Material contacts under cyclic compression,studied in real time by electrical resistance measurement

Contacts of similar materials under cyclic compression below the yield stress were studied in real time by measurement of the contact electrical resistance. For all materials studied (steel, aluminum, copper, polymer and cement mortar), the contact resistance decreased upon loading in every load cycle. The resistance at the minimum stress of a cycle decreased upon load cycling for steel (at a sufficiently high stress amplitude), polymer-matrix composite and mortar due to plastic deformation at asperities, but increased upon cycling for aluminum and copper, probably due to surface oxidation and/or strain hardening. For steel and aluminum, the resistance at the maximum stress of a cycle increased upon load cycling, probably due to oxidation and/or strain hardening, and it took more stress for the resistance to decrease in a cycle as cycling progressed, probably due to strain hardening. For the polymer (thermoplastic), it took less stress for the resistance to decrease in a cycle as cycling progressed, probably due to enhancement of the molecular orientation perpendicular to the stress. For the mortar, the minimum resistance at the maximum stress increased slightly as cycling progressed, probably due to debris generation.