To investigate the effects of corona discharge field treatment of different electric field strength with the different polarities on the vigor of millet seeds, the positive and negative corona discharge fields generated with arc-shaped prick electrodes and plate electrodes are different for millet seeds respectively. The treatment voltage was (2 × n kV, n = 1, 2.. .10) and the time treated was 2 min. The results showed that after treatment by the corona discharge field, the germination potential, germination rate, germination index and vigor index of millet seeds increased to different degrees compared with the control. The optimal treatment voltages of the positive and negative corona discharge field were 12 kV. Under the optimal treatment voltage, the germination indexes (germination potential, germination rate, germination index, vigor index) of millet seeds were significantly different from the control (p <0.01), and the millet seeds treated by the positive corona discharge field compared with the control group, the germination potential, germination rate, germination index and vigor index increased by 21.2%, 23.0%, 19.9% and 23.2% respectively. The germination indexes of the millet seeds treated by the negative corona discharge field increased by 29.1%, 28.5%, 26.9% and 32.1%. It was also found that under the same treatment voltage, the electrical conductivity of the leachates of the millet seed treated with the negative corona discharge field was lower than that of the positive, which indicated that the negative corona discharge field would repair the cell membrane more effectively. According to various indicators, it can be concluded that the negative corona discharge field treatment was better than the positive. INDEX TERMS Electrical conductivity, corona discharge field, cell membrane repair, seed vigor.

Aiming at the problem that surgeons can not open unsterilized drawers by themselves after hand disinfection, intelligent drawer speech recognition control system was designed. The system based on non-specific person speech recognition technology takes embedded microprocessor as the core, consists of power modules, speech recognition module, stepper motor driver module and action execution system. Key words list and distance of recognition is set in program as needed, then speech recognition control system tests whether the speech of non-specific person accords with the given key words, and generates pulse width modulation signal to control stepper motor, then ball screw convert stepper motor's rotary motion into linear motion to control drawer's open and close. In order to ensure system performance, the corresponding experiments were did. Experiment results showed that speech recognition rate of system in the indoor environment can reach 90% or more, and it in the outdoor environment also can reach 81.7%. System stability is better in the quiet, and control system could do correct response when key words are said two times at the most. And it has declined in the noisy, and in order to make control system do correct response, some control orders need to be said three times or more. System real-time response can be guaranteed in the quiet, and response time is less than 2 s, it need more time in the noisy.

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Abstract:In order to keep the farm machines straight in the agricultural production process, the straight-line navigation system for farm machines based on mobile internet technology and inertial navigation technology was developed. Straight-line navigation system consists of sensor subsystem and the Android mobile terminal. The sensor subsystem measures the deflection angle and uploads the angle to the Android mobile terminal via Wi-Fi. The Android mobile terminal that installed the straight-line navigation APP can accomplish real-time displaying the navigation data and setting the system parameters. The results indicate that the maximum offset error was less than 7.8 cm for straight trajectory tracking after the farm machine moved 50 m when the traveling speeds of the farm machine was not greater than 0.95 m/s. The straight-line navigation system can meet the requirements of agricultural production.