Wuxi Sea Pioneers Technologies Co., Ltd

Wuxi Little Swan Electric Co., Ltd.

Bin Xu

Jige Chen

Zhiyong Wu

Bo Pang

Yongjian Deng

Haitao Zhang

Peng Guo

Zhengdong Cheng

Lianghong Liu

Jingyang Li

Hongdi Li

Yanjing Wu

The present invention provides a preparation method of a gallium nitride single crystal based on a ScAlMgOsubstrate, comprising following steps: (1) providing a ScAlMgOsubstrate; (2) growing a buffer layer on a surface of the ScAlMgOsubstrate; (3) annealing the buffer layer; (4) growing a GaN crystal on the buffer layer; (5) performing cooling, so that the GaN crystal is automatically peeled off from the ScAlMgOsubstrate. The present invention does not need to use a complex MOCVD process for GaN deposition and preprocessing to make a mask or a separation layer, which effectively reduces production costs; compared with traditional substrates such as sapphire, it has higher quality and a larger radius of curvature, and will not cause a problem of OFFCUT non-uniformity for growing GaN over 4 inches; finally, the present invention can realize continuous growth into a crystal bar with a thickness of more than 5 mm, which further reduces the costs.

Method for growing a GaN single crystal film on a buffer layer on a ScAlMgO4 substrate and performing cooling so that the GaN film is peeled from the ScAlMgO4 substrate

A device for measuring flow rate of wet gas based on an exempt radioactive source, includes a section of cylindrical pipe and a conical throttle located inside the cylindrical pipe and coaxially arranged therewith. The conical throttle includes a head cone section and a tail cone section arranged to have a common bottom surface. The head cone section faces a wet gas inlet of the cylindrical pipe. An annular gap is defined between the inner wall of the cylindrical pipe and the maximum diameter of the conical throttle for passage of wet gas. An exempt radioactive source block is arranged at the maximum diameter of the conical throttle in such a way that the gamma rays emitted from the radioactive source block can transmit radially through the annular gap to reach the gamma ray detector located outside the cylindrical pipe.

Device for measuring flow rate of wet gas based on an exempt radioactive source

The invention is directed to apparatus for measuring mass flow-rates of the gas, oil and water phases in a wet gas, comprising the following parts: a differential pressure flow meter, having a throat section, and a gamma ray detector, comprising a gamma ray emitter and a gamma ray receiver that are arranged in such a manner that gamma rays emitted from the gamma ray emitter can pass through the throat section in diametrical direction to reach the gamma ray receiver; wherein a radioactive source in the gamma-ray emitter is a multi-energy radioactive source that can naturally emit at least three energy gamma rays, and a thermostatic device is not used in the gamma ray receiver. The invention further relates to a metering method for measuring mass flow-rates of the gas, oil and water phases in a wet gas, in which the above apparatus is used. As for the apparatus according to the invention, neither a thermostatic device nor the calibration for the empty tube value is in need, and thus it is very suitable for the uses under water or down-hole.

Apparatus and method for measuring mass flow-rates of gas, oil and water phases in wet gas

A method for measuring respective flowrates of gas phase and liquid phase in a multiphase fluid using a critical flow nozzle flowmeter. The critical flow nozzle flowmeter includes a throttling nozzle having an inlet, an outlet and a throat, and the throat has a smallest flow area for flowing fluid; a gamma ray detector, including a gamma ray emitter and a gamma ray receiver, arranged in a way allowing the gamma ray emitted by the gamma ray emitter to pass through a cross-section at the inlet of the throttling nozzle in a diametrical direction to reach the gamma ray receiver; pressure sensors respectively configured for measuring the pressure Pat the inlet of the throttling zone and the pressure Pat the outlet of the throttling nozzle; and a temperature sensor configured for measuring the temperature Tat the inlet of the throttling nozzle.

Critical flow nozzle flowmeter for measuring respective flowrates of gas phase and liquid phase in multiphase fluid and measuring method thereof

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Wuxi, China

Bin Xu