ABSTRACT
Covid-19 is more likely to spread in campus than it in other places because students live together without masks. In this case, it is necessary to take nucleic acid tests in a unified time regularly. To make nucleic acid tests efficient and convenient to manage students and the testing time, this article would apply queuing theory to design a nucleic acid tests queuing system by using the data from Sanda University in April 2022. According to the special conditions on campus, such as course schedule, students' daily activities, and campus management, students would be grouped by several management styles. The system would calculate the start time and waiting time for each group and would strive to take nucleic acid tests in an orderly manner with minimal waiting time. © 2022 IEEE.
ABSTRACT
The COVID-19 caused by the novel coronavirus is still spreading globally, and blocking its airborne transmission route is of great significance to control the pandemic. The conventional plasma air disinfection devices show advantages in their dynamic and rapid capabilities, but the disinfection performance is limited by a single method, besides, there exists the risk of secondary infection during maintenance. In this work, according to the physiological characteristics of the novel coronavirus, an air disinfection device based on thermally coupled corona discharge was proposed for the improvement of conventional plasma air disinfection technology, which adopted the wire-plate array electrode structure to initiate corona discharge, and utilized heating wires embedded in the collection plate to achieve centralized heating. The discharge para-meters were measured, and a discharge power at stable operation was discovered to be as high as 5.6 W, for which the discharge law was found to obey the Townsend relationship. Measurement and simulation of the thermal parameters showed that, compared with the overall air heating, the efficiency of centralized heating was increased by 17 times, with minimal impact on the ambient temperature. Bacillus amyloliquefaciens and Bacillus subtilis bacteriophages were used as model bacteria and virus to verify the disinfection performance. Results demonstrate that the killing performance is effectively enhanced via thermally coupled corona discharge, with a removal rate of residual virus on the collection plate increasing by 99.97%, thereby reducing the risk of secondary infection. This work lays a device foundation for killing the airborne novel coronavirus, and also provides a technical reference for cutting its airborne transmission. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.