仪表自动控制设计中SPI软件的应用分析

针对在仪表自动控制设计中应用SPI设计软件的广泛性与重要性，根据对数据调用图、数据共享协同设计、安装材料以及回路图的处理等应用，具体对SPI应用于仪表自动控制设计及其二次开发的特点，并对在工厂生命周期管理中怎样发挥SPI软件的优势进行了详细论述、     

Optical measurements and analytical modeling of magnetic field generated in a dieletric target

Polarization rotation of a probe pulse by the target is observed with the Faraday rotation method in the interaction of an intense laser pulse with a solid target.The rotation of the polarization plane of the probe pulse may result from a combined action of fused silica and diffused electrons.After the irradiation of the main pulse,the rotation angle changed significantly and lasted ～2 ps.These phenomena may imply a persistent magnetic field inside the target.An analytical model is developed to explain the experimental observation.The model indicates that a strong toroidal magnetic field is induced by an energetic electron beam.Meanwhile,an ionization channel is observed in the shadowgraph and extends at the speed of light after the irradiation of the main beam.The formation of this ionization channel is complex,and a simple explanation is given.     

大直径泥水盾构在上软下硬岩性多变地层中的适应性设计

大直径泥水盾构在上软下硬岩性多变地层长距离掘进时,容易出现沉降控制难、盾构姿态不易控制、刀具磨损严重和刀盘结泥饼等现象。以环城北路—天目山路提升改造工程01标段为工程依托,针对工程盾构直径大、盾构隧道穿越地层变化大和上覆土浅的特点,从盾构隧道刀盘选型、刀具布置等方面对盾构机进行针对性设计,总结了上软下硬岩性多变地层盾构选型的具体措施,有效提高施工效率,降低带压换刀的风险,保证施工质量,显著提高经济效益和社会效益。     

载流搅拌摩擦焊对2219铝合金显微组织和力学性能的影响

采用载流搅拌摩擦焊方法对6 mm厚AA2219铝合金板进行了不同脉冲电流大小的对接焊实验,研究焊接接头显微组织形貌和力学性能,结合断口宏观形貌及不同区域的硬度分布趋势,揭示电流对接头性能的影响.结果表明:随着电流增加,热输入增高,晶粒动态再结晶区域增多,接头抗拉强度和断后伸长率提升,拉伸试样断裂均发生在前进侧搅拌区和热...