高频脉冲微束等离子电弧温度场的测试及分析

本文首次采用单波长激光干涉技术，对恒定直流和高频脉冲电流微束等离子电弧温度场进行了测试，并做了分析比较。以电弧温度分布为基础分析了高频脉冲电流微束等离子电弧收缩、稳定的原因。     

内燃机节油率计算的探讨

讨论比较了现有内燃机节油率计算方法的优缺点、产生误差的原因，提出了采用曲线拟合的方法求取率的新方法。文中给出了计算公式和计算步骤，通过编制计算机程序，计算了几种典型发动机的节油率指标，并传统的按度试验数据逐点计算方法进行了对比，证明此方法是一种比较客观、科学的节油率指标计算方法。     

Synthesis of ultrafine LiCoO2 powders by the sol-gel method

Ultrafine high-temperature (HT) LiCoO₂ powders were synthesized by the sol-gel method using polyacrylic acid (PAA) as a chelating agent. The decomposition process of the gel precursor was examined to determine the crystallization temperature and the dependence of the physicochemical properties of HT-LiCoO₂ powders on the PAA quantity was extensively investigated. Polycrystalline HT-LiCoO₂ powders, composed of very uniformly sized ultrafine particulates with an average particle size of 30–50 nm and a specific surface area of 2.3–17 m²g^–1, could be obtained at the lower calcination temperature of 550 °C and the shorter calcination time of 1 h compared to the solid-state reaction.     

DF_4内燃机车柴油机润滑油的热重分析

通过对DF_4内燃机车柴油机润滑油的热重曲线TG和微商热重曲线DTG的分析,探讨了这种润滑油的衰变规律。     

油溶性减阻功能聚合物的研制

介绍了以混合α-烯烃为原料,制备了具有减阻功能的共聚物。讨论了催化剂浓度、聚合温度、预聚合时间、原料单体中杂质含量对共聚物特性粘度和转化率的影响。试验表明,在较低的催化剂浓度和预聚合温度下,能得到较高分子量的聚合物。气相色谱法和DSC法测定其组成和单体混合物的组成基本一致,表明共聚物是一种无规的梳状结构聚合物。该聚合物达到较高特性粘度时,能获得较好的减阻率。     

低旋流进气直喷燃烧系统在195柴油机上的应用研究

介绍了低旋流进气直喷燃烧系统应用于１９５柴油机的试验结果，着重探讨了燃烧室结构尺寸和供油系统主要参数对柴油机性能和燃烧放热规律的影响。研究表明，这种燃烧系统应用于小缸径直喷柴油机具有良好的推广前景。     

Interface microstructure and reaction in Gr/Al metal matrix composites

The interface structure in Gr/Al composites fabricated with liquid metal infiltration has been studied using transmission electron microscopy (TEM). Morphologies of interfacial reaction product, aluminium carbide Al₄C₃, formed at different manufacturing parameters were compared and, the growth mechanism of the carbide was studied by means of high resolution electron microscopy (HREM). It has been shown that the morphology of the carbide is intimately related to the processing parameters with which the composites were produced. There are two kinds of interfaces between the carbide and the aluminium matrix. They have different growth mechanisms and relative growth rates under different growth driving forces. Several crystal orientation relationships between the carbide and the aluminium matrix have been observed.     

Characteristics of aperture coupled microstrip antennas withvarious radiating patches and coupling apertures

A full wave moment method is applied to the analysis of aperture coupled microstrip antennas, in which all components of the electric and equivalent magnetic surface currents are considered. The electric current distributions on the rectangular patch for different coupling aperture positions are presented with their radiation patterns. The effects of the coupling aperture shape and size on the input impedance and radiation performance are also discussed. As an example of new radiators, slotted patches are studied, and it is shown that they can be used to achieve dual-frequency operation     

复杂电磁环境中线天线近场数模预测

本文应用矩量法和几何绕射理论的混合技术及矩量法的稀疏技术详细分析和计算了多导体同时存在的复杂电磁环境中线天线的近场。理论值与实验数据进行比较，两者基本吻合。