掩埋小目标声探测技术研究

探测和识别沉底、掩埋水雷等小目标在军事上显得愈来愈迫切。在介绍掩埋小目标探测声纳现状的基础上,剖析了掩埋小目标声探测的技术难点,总结了小目标声探测技术的发展趋势,主要包括探测频率向低频发展,重点发展合成孔径探测技术,积极探索时反探测和MIMO探测方法,小目标识别技术向联合利用图像特征和散射特征的方向发展等,对沉底/掩埋小目标声探测技术研究及其声纳设计有借鉴指导意义。     

离子膜电解槽优化运行

从进槽电解液及运行管理两个方面介绍离子膜电解槽的优化运行条件。     

关于铸铁小件报价的系统总结

铸铁件在报价之前须根据铸造工艺、机械加工工艺、热处理工艺、表面处理工艺等作出全面系统的评估分析,以降低潜在的风险,然后结合本厂新产品开发能力,生产能力,质量控制能力,再进行合理的报价。     

文胸原型结构分析

在对国内外现有文胸原型的绘制方法收集、比较的基础上,通过整理归类,将其归纳为定数法、公式与定数结合法、立体与平面结合法3种方法,并系统分析了这3种方法的特点和优劣,认为现有文胸原型存在着胸省量缺乏依据,重要部分规格未体现,胸高点位置不合理,肩带位置设计区域没有涉及,罩杯的容量与乳房的体积关系未涉及等问题;并提出了文胸原型结构设计需要避免上述这5类缺点,确保对人群的适用性,便于测量、绘制和使用,并能根据人体美和功能的要求进行理想化的绘制。     

工程机械覆盖件的结构与工艺改进

工程机械覆盖件采用薄板加筋板焊接结构，在制造、装配过程容易发生变形，不易装配并影响产品整体外观。在改进设计中，采用薄板冲压成形结构，免去了加强筋板的焊接，生产过程中变形减小，外观质量大大提高。     

Microstructure and Properties of Hot Working Die Steel H13MOD

Compared with H13 steel, the influences of different heat treatment process on the microstructure and properties of the new type of hot working die steel H13MOD were studied. The results show that the complete austenitizing temperature of H13MOD is around 1030 °C and the quenching hardness achieves the maximum value at this temperature. While for H13, the complete austenitizing temperature is above 1100 °C and the quenching hardness rise constantly with the quenching temperature increasing. In quenching process, the undissolved MC carbides can prevent the coarsening of grain in both steels. With the rise of quenching temperature, when MC carbides dissolve completely, the grain grows quickly. The hardness and strength of H13MOD at higher tempering temperature (above 570 °C) are nearly the same as those of H13, but its toughness is higher than that of H13. Mo₂ C carbide is the main strengthening phase in H13MOD, which is attributed to the higher content of Mo. The quantity of VC eutectic carbides is reduced because of lower content of V in H13MOD, which plays an important role in enhancing the impact toughness of H13MOD. Under a certain strength condition, H13MOD steel can be used in the environment that higher toughness is required and the service life of die casting mold can be improved.     

带式输送机溜槽堵塞监测器的改进

通过对带式输送机溜槽堵塞监测器的改进,减少了溜槽堵塞事故,确保了生产顺行和安全.