Applying plant community diversity techniques and SPSS statistic analysis, we quantified the relationship between crown volume of 18 (Sophora japonica) tree communities and elevation along different elevation gradient in Ye County in the study. We concluded that there was a significantly positive correlation between crown volume of 18 (Sophora japonica) tree communities and elevation gradient (P < 0.01). Elevation was the dominant environment driver crown volume of (Sophora japonica) tree communities increased along elevation from 50 m to 200 m in Ye County in 2018. Therefore, understanding dynamic connecting crown volume of 18 (Sophora japonica) communities and elevation can be not just applied to preserve of (Sophora japonica) tree communities, but also applied to sustainable of biodiversity and processes of tree community's crown volume along elevation.
The building heating energy consumption has drawn peoples attention gradually. Heat transfer station, as the central part of the heating system, has the characteristics of great inertia, pure delay in the temperature control system. Considering these characteristics, the GA-PID arithmetic was presented, and a simulation model was created in this dissertation. Comparing with traditional PID control, GA-PID control system has a half overshoot, shorter adjustment time, higher accuracy, and enters into the steady state faster. The simulation results prove the correctness and effectiveness of the proposed control scheme.
Dynamic measurement of explosion containment vessel deformation for explosive experiment is obtained using laser doppler effect. The system is based on optical heterodyning technologies, and uses half wave plate, quarter wave plate, polarization beam splitter and acousto-optic modulator to improve the intensity of doppler signal and signal-noise-ratio. Short time fourier transform and energy centrobaric correction method using hamming window is applied to improve the signal processing speed and the accuracy. The experimental results of explosive container are presented under 20g TNT explosion.
Usually the heat exchange station mainly adopts human monitoring which does not only waste human resources but also has many hidden dangers. On some control parameter adjustment, manual adjustment has a certain deviation and it is difficult to achieve the ideal running effect. The paper uses PIC single chip microcomputer as the controller core and transmits the collecting data to the monitoring center through GPRS - Internet network. This real-time monitoring system can effectively solve the problem of uneven heating caused by artificial regulate and achieve long-distance wireless remote monitoring and automatic temperature adjustment. It also has the certain energy-saving effect.
According to the characteristics of pneumatic marking system, and the typing path was seen as a TSP problem. After comparing the Dijkstra optimization algorithm of marking path results, and applying the genetic algorithm (GA) to analysis, research, and solve the optimization problem, reasonable to get print needle typing path. In this case, printing mark time was shorten as much as possible. It was proved by MATLAB simulation that the study can solve the problem of path optimization and improve the efficiency of marking greatly.
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