To compare the epidemiological and psychological features of globus symptoms between individuals from urban and rural areas in Guangzhou.In total, 3360 individuals aged 18 years and over were selected to participate in our questionnaire investigation using random cluster sampling under the stratification of a urban area and a rural area. The questionnaire comprised questions on personal characteristics and globus symptomatology and psychological characteristic and sleep quality scales.Lifetime prevalence and Glasgow-Edinburgh throat scale scores of globus symptoms were greater in the urban area than in the rural area, but no significant differences in sex ratio or onset age between individuals with globus were found. The incidences and severity of anxiety, depression, and sleep disorders were significantly higher among patients who presented with globus in the urban area than among those in the rural area.The lifetime prevalence of globus symptoms and the psychological features of globus patients differ between urban and rural inhabitants. We should pay more attention to these differences.
In view of the anti-friction and anti-adhesion characteristics of bionic surface structure in bioengineering, a new processing technology of hole-to-hole strip sprinkler tool is proposed innovatively to achieve precision and large-scale surface micro-texture manufacturing. On the basis
of electrolytic jet mask processing, the array structure of strip nozzle with variable hole spacing was designed. Combining with electric field parameters, the model was established by COMSOL Multiphysics software and the simulation analysis was carried out. Experiments show that the technology
has high processing efficiency, low surface roughness, regular morphology and good consistency of the fabricated arrays, which provides a new idea for the fabrication of bionic micro-texture arrays.
In order to enhance the control stability and anti-interference ability of quadcopter, this paper presents a quadcopter based on double-layer PID control, and designs a quadcopter with STM32 as the main controller, and simulates and verifies its control system attitude. Firstly, the nonlinear attitude mathematical model of the aircraft is established by the four-element method, and the relationship between the attitude angle and the angular velocity of the aircraft is obtained by solving, so that the measurement data of multi-attitude sensors of the four-axis aircraft can be better fused. Then, according to the deviation between the target attitude and the current attitude of the aircraft, a double-layer PID control method is proposed based on the traditional PID controller. The outer loop controls the angle of the aircraft and the inner loop controls its angular velocity to improve the adaptability and accuracy of the aircraft. At last, the attitude of quadcopter with two controllers is simulated and compared by Matlab simulation software. The simulation results show that the quadcopter with PID control has a slow response time, and the attitude stabilization time is 2.7s, while the quadcopter with double PID control has a fast response time, and the attitude stabilization time is 0.4 s, which has good control stability and strong anti-interference ability, and improves the adaptive ability and robustness of aircraft control.
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