Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves a heat pump system and control method.

Abstract: A method for preparing a graphene-coated powder material, comprising: A) dispersing a graphene powder and/or graphene oxide powder, a powder material to be coated with graphene, and a polymeric co-coating agent in a first organic solvent to form a first organic solvent dispersion; B) mixing the first organic solvent dispersion with a second organic solvent and separating a precipitate after sedimentation; and C) annealing the precipitate in an inert atmosphere to obtain the graphene-coated powder material; wherein the polymeric co-coating agent is soluble in the first organic solvent but insoluble in the second organic solvent. The present invention also relates to a graphene-coated powder material prepared by the method.

Abstract: Disclosed is a sheep PDGFD, nucleic acids encoding PDGFD and recombinant lentivirus, host cell and use thereof, which relate to the technical field of molecular cell biology. The sheep platelet-derived growth factor PDGFD includes one or two of PDGFD-T1 and PDGFD-T2. The amino acid sequence of PDGFD-T1 is set forth in SEQ ID NO:1, and the amino acid sequence of PDGFD-T2 is set forth in SEQ ID NO:2. PDGFD-T1 and PDGFD-T2 are able to significantly inhibit the differentiation and maturation of precursor adipocytes and significantly reduce the mRNA relative expression levels of adipogenic differentiation-related genes CEBP?, PPAR?, FAS, FABP4 and LPL, thereby inhibiting animal fat deposition and improving animal meat quality, and have important guiding significance in the fields of life science, medical science, animal husbandry and the like.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves an air control method for air handler unit.

Abstract: A LiDAR odometry method based on the directed geometric point and sparse frame includes: obtaining original three-dimensional point cloud data of a surrounding environment in the coordinate system of the current frame of the LiDAR sensor; constructing and converting the first directed geometric point set and first environmental directed geometric point set into the second directed geometric point set and second environmental directed geometric point set in the world coordinate system, respectively; calculating candidate associated points in the second environmental directed geometric point set in association with each point in the second directed geometric point set, and determining the best associated point of each point in the second directed geometric point set; constructing and solving a pose optimization function to obtain an optimized pose from the coordinate system of the current frame of the LiDAR sensor to the world coordinate system; and updating directed geometric point sets of sparse frames.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves a heat pump system and control method.

Abstract: Disclosed are a measurement-while-drilling method and device for obtaining a coal seam gas parameter applicable to measurement of a coal seam gas/coal seam methane parameter while drilling and evaluation of gas drainage performance. The invention performs a measurement-while-drilling operation to obtain information about downhole gas and a coal seam, thereby realizing on-site measurement of a coal seam gas parameter while drilling. The measurement-while-drilling device for obtaining a coal seam gas parameter comprises a compartment (17), a pressure sensor (15), a temperature sensor (14), a flow sensor (4), an acoustic emission sensor (16), a monitoring and control module (11), a power module and a communication module. The device is installed between a drill bit (1) and a first drill pipe (20).

Abstract: The present invention provides an inversion calculation method of coal-bed gas parameters of fast test while-drilling. The technical solution is that an inversion calculation method of coal-bed gas parameters of fast test while-drilling includes: during drilling in a coal bed, testing a gas flow and a gas concentration of an orifice in real time while-drilling, calculating drilling gas discharge amounts of the orifice, inversely calculating a coal-bed gas pressure at a drill bit based on borehole and coal-bed permeability parameters, and calculating a coal-bed gas content according to a gas content and gas pressure relational expression. The present invention has the beneficial effects that the present invention does not occupy the drilling and drill rod replacement time, is accurate, convenient, real-time and fast, and can test and calculate the coal-bed gas parameters of each section along the whole borehole length.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves an air control method for air handler unit.

Abstract: The present disclosure relates to the field of air conditioning technology. In particular, it involves a refrigerant charging method for variable speed compressor based ac system.

Abstract: The present invention provides an inversion calculation method of coal-bed gas parameters of fast test while-drilling. The technical solution is that an inversion calculation method of coal-bed gas parameters of fast test while-drilling includes: during drilling in a coal bed, testing a gas flow and a gas concentration of an orifice in real time while-drilling, calculating drilling gas discharge amounts of the orifice, inversely calculating a coal-bed gas pressure at a drill bit based on borehole and coal-bed permeability parameters, and calculating a coal-bed gas content according to a gas content and gas pressure relational expression. The present invention has the beneficial effects that the present invention does not occupy the drilling and drill rod replacement time, is accurate, convenient, real-time and fast, and can test and calculate the coal-bed gas parameters of each section along the whole borehole length.

Abstract: A measurement-while-drilling method and device assesses outburst risk and evaluates gas drainage performance of a coal seam. The device includes a compartment, a pressure sensor, a temperature sensor, a flow sensor, an electromagnetic sensor, an acoustic sensor, a wave velocity measurement module, a monitoring and control module, a power supply and a communication interface. These are installed between a drill bit and an inclinometer or a first drill pipe. Measurements are performed while drilling to obtain a real time gas parameter, lithologic and coal seam information, for on-site assessment of outburst risk. During drill bit replacement, gas pressure, temperature, flow velocity, wave velocity, electromagnetic radiation, and an acoustic signal are recorded in real time, to calculate stress of the coal seam and coal seam outburst risk. On-site measurement is done while drilling without sampling and can use multiple parameters to perform synchronous measurement to obtain a comprehensive evaluation.

Abstract: A measurement-while-drilling method and device assesses outburst risk and evaluates gas drainage performance of a coal seam. The device includes a compartment, a pressure sensor, a temperature sensor, a flow sensor, an electromagnetic sensor, an acoustic sensor, a wave velocity measurement module, a monitoring and control module, a power supply and a communication interface. These are installed between a drill bit and an inclinometer or a first drill pipe. Measurements are performed while drilling to obtain a real time gas parameter, lithologic and coal seam information, for on-site assessment of outburst risk. During drill bit replacement, gas pressure, temperature, flow velocity, wave velocity, electromagnetic radiation, and an acoustic signal are recorded in real time, to calculate stress of the coal seam and coal seam outburst risk. On-site measurement is done while drilling without sampling and can use multiple parameters to perform synchronous measurement to obtain a comprehensive evaluation.

Abstract: Disclosed are a measurement-while-drilling method and device for obtaining a coal seam gas parameter applicable to measurement of a coal seam gas/coal seam methane parameter while drilling and evaluation of gas drainage performance. The invention performs a measurement-while-drilling operation to obtain information about downhole gas and a coal seam, thereby realizing on-site measurement of a coal seam gas parameter while drilling. The measurement-while-drilling device for obtaining a coal seam gas parameter comprises a compartment (17), a pressure sensor (15), a temperature sensor (14), a flow sensor (4), an acoustic emission sensor (16), a monitoring and control module (11), a power module and a communication module. The device is installed between a drill bit (1) and a first drill pipe (20).

Abstract: The present invention provides a biochip for simultaneously detecting a variety of antibiotics, illegal additives and biotoxins in a visualized manner, wherein the biochip comprises a chip carrier fixed with a group of detection target antigens, the detection targets are the antibiotics, the illegal additives and the biotoxins, and the biochip is prepared by the following method: enabling the bovine serum albumin and the detection target antigens to perform sample application operation on the chip carrier through a biochip preparation system by taking bovine serum albumin as blank control, and then fixing in a water bath at 20-37° C. for 0.5-4 h for preparation. The invention further provides a method for simultaneously detecting a variety of antibiotics, illegal additives and biotoxins by using the biochip.