磁共振成像主要利用人体内氢质子等的自旋共振进行成像。在超导磁场环境中,使用垂直或倾斜角度的射频脉冲来完成共振。射频脉冲是一种交变的射频磁场,由谱仪(Spectrometer)其中的一块电路控制板发出,经过射频放大器放大到所需要的功率...磁共振成像主要利用人体内氢质子等的自旋共振进行成像。在超导磁场环境中,使用垂直或倾斜角度的射频脉冲来完成共振。射频脉冲是一种交变的射频磁场,由谱仪(Spectrometer)其中的一块电路控制板发出,经过射频放大器放大到所需要的功率后进行处理,并送入发射线圈(通常是正交体线圈Quadrature Body Coil)发射。展开更多
The control method of rubber tyre gantry （RTG） spreader in Qingdao Port Container Terminal is logic board control,which has many shortcomings such as expensive spare parts and high faults.This paper designs a new co...The control method of rubber tyre gantry （RTG） spreader in Qingdao Port Container Terminal is logic board control,which has many shortcomings such as expensive spare parts and high faults.This paper designs a new control system using programmable logic controller （PLC） centralized control to replace the original logic board control.The new system mainly contains complete ELME spreader control scheme design,hardware selection and PLC control program development.Its field application shows that the system has characteristics of high efficiency,low running cost,easy maintenance.展开更多
System Four采集站的抗干扰能力较差,功耗较高。本文通过对System Four采集站控制板电路进行分析,利用系统测试程序,借助示波器和数字万用表,对有关电路进行了改造:在采集站的命令对、数据对的输入端口和采集站电源的输入端口都增加保...System Four采集站的抗干扰能力较差,功耗较高。本文通过对System Four采集站控制板电路进行分析,利用系统测试程序,借助示波器和数字万用表,对有关电路进行了改造:在采集站的命令对、数据对的输入端口和采集站电源的输入端口都增加保护电路,并更换部分性能较差的器件,从而提高了采集站的抗干扰能力,降低了采集站的功耗。展开更多
文摘磁共振成像主要利用人体内氢质子等的自旋共振进行成像。在超导磁场环境中,使用垂直或倾斜角度的射频脉冲来完成共振。射频脉冲是一种交变的射频磁场,由谱仪(Spectrometer)其中的一块电路控制板发出,经过射频放大器放大到所需要的功率后进行处理,并送入发射线圈(通常是正交体线圈Quadrature Body Coil)发射。
基金Shandong University of Science and Technology Spring Buds Program(No.2010AZZ170)
文摘The control method of rubber tyre gantry （RTG） spreader in Qingdao Port Container Terminal is logic board control,which has many shortcomings such as expensive spare parts and high faults.This paper designs a new control system using programmable logic controller （PLC） centralized control to replace the original logic board control.The new system mainly contains complete ELME spreader control scheme design,hardware selection and PLC control program development.Its field application shows that the system has characteristics of high efficiency,low running cost,easy maintenance.
