In order to better analyze the influence of electrical equipment on power grid fluctuations, a detection system is designed for power quality monitoring. The system uses 51 single-chip microcomputer as the control core, combined with IM1281B single-phase mutual inductance energy metering module, to collect real-time voltage RMS, current RMS, power factor, apparent power, active power and other electrical parameters of electrical equipment connected to the grid. The standard Modbus-RTU is used for communication between IM1281B and the single-chip microcomputer, which realizes the real-time acquisition and processing of multiple electrical parameters of the electrical equipment connected to the power grid. The experimental results show that, the single-phase power quality monitor designed based on IM1281B is simple in structure, and relatively complete in collecting electrical parameters, which can meet the needs of power quality analysis.

The paper analyzes the film sticking technology and stress of large-span single-layer spherical reticulated shell structure,uses SolidWorks,a three-dimensional software,to simply model the large-span single-layer spherical reticulated shell structure, analyzes the stress of triangle frame after filming by theoretical analysis and ANSYS simulation software.In the research, the experimenter makes one kind of film cutting device plate used for triangle frame.The film cutting by film cutting device plate not only can save cost and reduce labor intensity during sticking film,but also position the film accurately and improves the overall stiffness of the spherical reticulated shell.By analyzing the real stress situation in the actual operation process of large-span reticulated shell structure,the mechanical loading test was used to analyze the overall mechanical properties of the spherical reticulated shell structure before and after film sticking,and verified that the overall mechanical properties and stiffness of large-span reticulated shell structure are improved after film sticking by using film cutting device is used.The test analyses are basically consistent with the simulation analyses,which further verifies the feasibility of the film cutting device and the rationality of the design of large-span reticulated shell structure,which provides a reference for the further design of large-span reticulated shell structure.

A real-time monitoring and alarm system for intravenous infusion in isolation wards is designed to reduce the number of contact between medical staff and patients during intravenous infusion. The system includes STM32L052K8 as lower computer to collect the speed and dosage of intravenous infusion, upper computer adopting LabVIEW to design the infusion monitoring interface and the communication via universal asynchronous receiver transmitter (UART). The experimental results show that the intravenous infusion monitoring system designed with STM32L052K8 and LabVIEW can realize real-time monitoring of drip, reduce the stay time of medical staff in isolation wards, and provide reference for hospital medical information.