自限温伴热带性能测试系统

针对自限温伴热带在手工操表测试其性能时存在着效率低，误差较大等问题，利用AD590、功率传感器WBP412和模拟乘法器分别来测试伴热带的温度、功率和电压信号，开发了可实现自动测量的性能测试系统．实验结果表明，本测试系统操作简单，效率高，测试准确，其相对误差均低于2％．     

土木结构围堰在施工导流工程中的应用

在逊克县库尔滨流域(乌一)水电站施工过程中，成功地应用了一种特殊型式的土木结构围堰，代替浆砌石结构围堰作为施工导流工程的纵向围堰。这种型式的围堰具有断面小、取材容易、适合机械化作业和投资少等诸多优点，阐述了这种型式围堰的设计及应用情况。     

纳米级二氧化钛超细粉的制备

采用醇盐的乙醇溶液，制备了纳米锐钛矿相二氧化钛粉体．通过TEM和XRD分析测试手段，对所得粉体进行了表征．TiO2粒子外观呈球形，粒径为5～10nm．用此制备工艺新技术，操作简单，无污染，易于实现工业化．     

直流绝缘故障检测智能传感器系统

为实现直流供电系统中的绝缘故障检测,研制了一种以AVR单片机为核心的智能传感器系统。该系统利用电磁感应原理检测直流供电系统中电气负载馈电回路的不平衡电流,实现了对电气负载绝缘故障的检测。经过现场测试,该智能传感器系统具有低功耗、高可靠性和易使用的特点,试验结果表明:系统达到了检测准确度要求。     

行驶车辆磁感应检测及智能道路传感系统

智能运输系统的前提条件之一是实现道路行驶车辆自动检测与交通信息实时采集。详细分析了磁感应式行驶车辆检测工作原理,建立了道路交通流信息计算模型,完成了基于DSP技术的智能检测系统设计与实现,采取了软硬件综合技术来对付现场各种干扰与噪声信号。对试验结果进行了分析,实际测试表明:系统性能稳定可靠。     

Study on Improving Solidification Structure of Rare Earth Al-Si Alloys with Electropulse Acting on Liquid Alloy

Electropulse modification (EPM) process, a new physical field method for improving the solidification structure of metals was introduced.Different from other research, EPM is only acting pulse current on melt under liquid state.The solidification structure of Al-Si alloys, A1-Cu alloys,cast iron and steel can be modified obviously with this method: the solidification structure of ZL101 alloy presented the Na and Sr modification and the mechanical properties were enhanced; a large number of primary silicon appeared in the microstructure of ZL109 alloy; the equiaxed grain zone was expanded and the grains were fined in Al-5.0wt% Cu alloy; the graphitization took place in solidification process of molten cast iron; the grain sizes of solidification structure of T8 steel were reduced significantly and the shape of steel pearlites also changed; the equiaxed grain zone increased to 88% from original untreated 19%, the equiaxed grains were fined and the intercrystalline crack was avoided in concasting billet by continuously treating liquid electrical sheet steel in tundish.Effects of rare earths on casting Al-Si alloys were also summarized.The method of modifying the solidification structure of rare earth Al-Si alloys with EPM in producing the alloys was proposed.     

Morphologies and Properties of Micro-Arc Oxidation on Plate and Cylinder 2024 Al Alloy

Samples with two different shapes of 2024 aluminum alloy were treated with micro-arc oxidation (MAO), and the formation process and mechanism of oxidation film was analyzed. The results show that different geometrical curvature of the material has an influence upon the uniformity of films and the corrosion-resistance.     

Influence of Si on Interfacial Combination of SiCp/Al-Mg-Si Composite

The scanning electron microscopy (SEM) analysis results of Si distribution in the interface between SiC reinforcements and aluminum matrix of a stir casting SiCp/Al-Mg-Si composite were presented. Results show that there is Si precipitation deposit on the interface of the composite and Si connects with SiC reinforcements in one side and connects with aluminum matrix in the other side. Si phase plays as a connecting bridge, which contributes to the interfacial combination of SiCp/Al composite.     

Superior step-size theorem and its application——Parallel variable step-size LMS filters algorithm

In several branches of adaptive filtering algorithms, the least mean square (LMS) algorithm is widely applied in many areas because of its low computational cost, good numerical stability and other features[1]. However, the contradiction between faster convergence and smaller steady-state mean squared error (MSE) affects its performance considerably. Step-size, as the key to the problem, can but offer only one choice of the two demands. Therefore, many variable step-size algorithms were prop…     

土壤中氮磷浸出对水库水质影响的模拟实验研究

水库建成蓄水后,库底土壤中氮、磷的浸出会对库水水质会产生一定影响。本文以南水北调中线工程的调蓄水库———瀑河水库为例,在现场调查基础上,使用蒸馏水和模拟水分别进行模拟实验,分析研究了土壤中氮、磷浸出对库水中总氮、总磷浓度的影响。实验结果表明,总氮、总磷的浓度均发生一定程度的变化,且模拟水中的浓度变化小于蒸馏水中的变化;但从整体趋势看,源于土壤的含量较低,对库水水质未产生明显不良影响。