Abstract: The present invention relates to improved recombinant plants or plant cells for producing omega-3 long chain polyunsaturated fatty acids such as eicospentaenoic acid (EPA) and docosahexaenoic acid (DHA). The invention further relates to the oil produced by said recombinant oilseed plant or cell.

Abstract: A test device for testing and commissioning comprehensive performance of a rotary drilling rig is provided. Dynamometer motors in the test device are provided on a foundation. A torque transmission gearbox is fixed on a gearbox anchoring plate through a gearbox adapter plate. A speed-increasing corner gearbox is provided on the torque transmission gearbox and connected to the dynamometer motors through a transmission shaft, a torque sensor, and a motor coupling sequentially. A drive sleeve is provided in a connecting shaft of the torque transmission gearbox. A lower end of the drive sleeve is connected to a hydraulic loading cylinder through a rotating bearing, a rotating support, and a tension-pressure sensor. The rotating support is fixed in the foundation. The hydraulic loading cylinder is connected to a hydraulic station through a hydraulic pipe. The tension-pressure sensor and a pressure control valve are connected to a computer software control system.

Abstract: A double-walled drill pipe includes an outer drill pipe, an inner drill pipe and a drill pipe sealing apparatus. The outer drill pipe includes an axial through hole and a wall surface through hole, and the wall surface through hole is disposed in a wall surface of the outer drill pipe to connect the outside of the double-walled drill pipe and the axial through hole. The inner drill pipe is rotatably disposed in the axial through hole, and includes a fluid guiding hole connected to the wall surface through hole. The drill pipe sealing apparatus is disposed between the outer drill pipe and the inner drill pipe. The drill pipe sealing apparatus is axially located between a driving end and a connecting port of the wall surface through hole connected to the axial through hole. A drilling machine including the double-walled drill pipe is also provided.

Abstract: A double-walled drill pipe includes an outer drill pipe, an inner drill pipe and a drill pipe sealing apparatus. The outer drill pipe includes an axial through hole and a wall surface through hole, and the wall surface through hole is disposed in a wall surface of the outer drill pipe to connect the outside of the double-walled drill pipe and the axial through hole. The inner drill pipe is rotatably disposed in the axial through hole, and includes a fluid guiding hole connected to the wall surface through hole. The drill pipe sealing apparatus is disposed between the outer drill pipe and the inner drill pipe. The drill pipe sealing apparatus is axially located between a driving end and a connecting port of the wall surface through hole connected to the axial through hole. A drilling machine including the double-walled drill pipe is also provided.