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Aiming at the existence of traditional water quality monitoring system in wiring trouble，high cost and low accuracy of the system， through the study of water quality monitoring system data communication mode，the sensor node hardware，sensor node software，quality in­formation sensing elements，a wireless water environment monitor system based wireless sensor networks was designed，the system consists of water quality monitoring node of multi-source information fusion，router node and upper computer monitor software. Water quality information was collected bythe sensor nodes，the collected data was sent by a wireless sensor network node to the sink and the local PCmonitoring cen­ ter via RS232 serial port. High performance STM32 microcontroller was used in sensor nodes，industrial pH electrode，YDC100 oxygen elec­trode was used in sensor portion as the sensing element. Research on the real-time monitoring of water quality for more than the alarm data， and be able to predict water quality warning function. The research results show that pH，dissolved oxygen and temperature average relative error of 4. 06%，3. 10% and 0. 85%，which meet the aquaculture water quality monitoring applications. [ABSTRACT FROM AUTHOR]

The materials supply for sea islands is the basis for ensuring survival needs of persons on sea islands. Considering factors such as transportation cost，storage cost，recycling demand and transportation capacity, it is a vehicle path planning problem with time window and capacity limit to use many transportation tools to supply materials for sea islands within a time cycle. The intelligent algorithm provides a preferable solution to solve this complex irregular optimization problem. The paper establishes a mathematical model of mission planning of materials supply for sea islands, explores the solving process of genetic algorithm， and uses an example to calculate it. The optimization result shows that the scheme can save transportation costs and storage costs， and also meet the need of materials supply cycle，which can provide a reference for scientific mission planning of materials supply for sea islands. [ABSTRACT FROM AUTHOR]

Aiming at the problem of the needle-free injector could not realize the continual jet and adjust doses, a volume-adjustable continuous-jet needle-free injector driven by voice coil motor was built( continuous-jet injector). The operating principle of the continuous-jet injector was introduced. The theory of the continuous-jet injector was analyzed. The theoretical model was built and the nozzle pressure theoretical curve was obtained. The system of pressure tests was built and the jet pressure force was tested dynamically, the nozzle pressure experimental curve was obtained. The results indicate that the theoretical curve identical with the experimental curve and the experimental data is smaller than the theoretical data in the same conditions. In addition, the coil electricity is increasie with the increasing of jet doses. [ABSTRACT FROM AUTHOR]