Abstract: A metal powder preparation system and method are provided. The metal powder preparation system includes a medium frequency smelting furnace, a homogeneous insulated quantitative pouring furnace, a precision-controlled liquid level temperature pouring ladle, and a plurality of groups of atomization mechanisms connected in sequence. The present application improves the preparation quality of the metal powder, so that the parameters such as the powder particle size, sphericity, fluidity, oxygen content, component distribution, and particle size distribution of the metal powder can all meet the requirements of high-quality metal additive manufacturing, achieving efficient and continuous preparation of the metal powder at the same time.

Abstract: The present disclosure discloses a performance evaluation method of a LNG ambient air vaporizer, comprising: step 1, performing a site test on an actually-operating LNG AAV and obtaining its parameters, performing a fluid-thermal coupling calculation and simulation of the LNG AAV by use of FEA software, then performing model modification based on the test results; step 2, performing fluid-thermal-structure coupling calculation of an AAV for validation in the FEA software, adding a submodel module for optimization and validation tests; step 3, performing fluid-thermal-structure coupling calculation on the LNG AAV to be evaluated under a design operation condition and an operation condition of the AAV to be put into service in a certain region, and evaluating the LNG AAV according to the results. The present disclosure can evaluate vaporization performance and fatigue life of the AAV simultaneously and has good operability and economical efficiency.

Abstract: Disclosed is a control method for a hydrogen-fueled domestic gas water heater. A staged combustion technology and a fully premixed combustion technology are combined in the method, a controller judges a combustion mode according to inlet water flow and set hot water input temperature, staged combustion of the hydrogen on a combustor is achieved due to the arrangement of two electromagnetic valves and the staged combustor, and meanwhile the stable combustion of the hydrogen can be achieved by adjusting a rotating speed of a fan and magnitude of currents of a gas proportional valve; and an oxygen sensor is arranged on a exhaust pipe, and the controller judges whether actual hydrogen combustion reaches an optimal state by monitoring outlet water temperature and oxygen concentration in flue gas and performs adjustment.

Abstract: Disclosed is a control method for a hydrogen-fueled domestic gas water heater. A staged combustion technology and a fully premixed combustion technology are combined in the method, a controller judges a combustion mode according to inlet water flow and set hot water input temperature, staged combustion of the hydrogen on a combustor is achieved due to the arrangement of two electromagnetic valves and the staged combustor, and meanwhile the stable combustion of the hydrogen can be achieved by adjusting a rotating speed of a fan and magnitude of currents of a gas proportional valve; and an oxygen sensor is arranged on a exhaust pipe, and the controller judges whether actual hydrogen combustion reaches an optimal state by monitoring outlet water temperature and oxygen concentration in flue gas and performs adjustment.

Abstract: The present disclosure discloses a performance evaluation method of a LNG ambient air vaporizer, comprising: step 1, performing a site test on an actually-operating LNG AAV and obtaining its parameters, performing a fluid-thermal coupling calculation and simulation of the LNG AAV by use of FEA software, then performing model modification based on the test results; step 2, performing fluid-thermal-structure coupling calculation of an AAV for validation in the FEA software, adding a submodel module for optimization and validation tests; step 3, performing fluid-thermal-structure coupling calculation on the LNG AAV to be evaluated under a design operation condition and an operation condition of the AAV to be put into service in a certain region, and evaluating the LNG AAV according to the results. The present disclosure can evaluate vaporization performance and fatigue life of the AAV simultaneously and has good operability and economical efficiency.

Abstract: The present invention discloses a data acquisition point deployment method and system. The method includes constructing a fitness function by combining a grid coverage rate of a to-be-detected water area and a scalar field reconstruction error of an environment field of non-uniformly distributed water quality features, then optimizing a location set of sampling points by a particle swarm optimization algorithm and a gravitational search algorithm, to determine the best solution of the location set of the sampling points and a fitness value corresponding to the best solution, and deploying a sampling point according to the best solution of the location set of the sampling points. The method realizes maximized coverage monitoring of the water area and better reconstructs the water quality distribution features of the entire water area to better reflect the water quality status of the entire water environment monitoring area according to a sampled value.

Abstract: Provided is a method for inhibiting the growth of tumor cells comprising administering to an individual in need of treatment, a composition comprising a therapeutically effective amount of Lappaol F. Also provided are compositions comprising Lappaol F and a pharmaceutically acceptable carrier.

Abstract: Provided is a method for inhibiting the growth of tumor cells comprising administering to an individual in need of treatment, a composition comprising a therapeutically effective amount of Lappaol F. Also provided are compositions comprising Lappaol F and a pharmaceutically acceptable carrier.

Abstract: The invention provides an electromagnetic shielding for electronic device. The electromagnetic shielding comprises: an opening provided at a position corresponding to the electronic device, through which a heat sink passes to be in contact directly with the electronic device; and at least one elastic arm made of conductive material provided at the circumference of the opening which are extending in a direction away from the shielding to be in a conductive contact with the side surface of the heat sink when the heat sink is mounted in position.