Abstract: A high-uniformity SiC crystal, a crystal bar, a substrate and a semiconductor device are provided. The SiC crystal is obtained by direct growth through a PVT method without subsequent machining, and includes a facet region and a non-facet region. The facet region is located on an outer-circumference end face of the SiC crystal. A doping concentration change rate of the facet region is 1.5 times or above that of the non-facet region; and/or a carrier concentration change rate of the facet region is 5 times or above that of the non-facet region.

Abstract: A high-quality SiC crystal, a crystal bar, a substrate, a preparation method, and a semiconductor device are provided. The SiC crystal contains a facet region and a non-facet region; and the facet region is located on an outer circumference of the SiC crystal, a distance between an edge of the facet region away from the outer circumference and the outer circumference does not exceed 3% of a diameter of the SiC crystal, and the SiC crystal is obtained by adopting a PVT method through direct growth without subsequent processing. In a subsequent processing process of the crystal, the facet region is eliminated, and the situation that the entire crystal bar and a wafer and substrate processed accordingly have no facet region is implemented with a low cutting loss rate.

Abstract: Disclosed in the present disclosure is a method for smelting a high-temperature alloy with an ultrahigh N content in a VIM furnace, and a high-temperature alloy with an ultrahigh N content. The VIM-furnace smelting method comprises a smelting step performed in a VIM furnace, and a casting step, wherein at a later stage of smelting, a nitrogen-containing substance is added to the VIM furnace to adjust the content of N. In the present disclosure, by comprehensively improving the raw materials, the smelting process, etc., the yield of N during a VIM-furnace smelting process is increased and accurate control over the content of N in the high-temperature alloy is achieved, such that a target content of nitrogen can be guaranteed, and an ideal product can thus be obtained.

Abstract: The present disclosure provides a medical hyperspectral image (MHSI) classification method based on a fast fully convolutional network (FCN), and relates to the technical field of MHSIs. The MHSI classification method includes: preprocessing and sampling an MHSI to obtain a training sample set; inputting the training sample set into an encoder-decoder-based FCN to train the MHSI; and inputting a to-be-classified pixel of the MHSI into a trained encoder-decoder-based FCN to obtain a classification result. The present disclosure provides the MHSI classification method based on a fast FCN. In order to resolve problems of low efficiency and insufficient performance of an existing MHSI classification method, the present disclosure designs a classification method based on the fast FCN, which avoids redundant computation in an overlapping region between image patches, greatly improving an inference speed.

Abstract: Provided is a magnetic particle imaging (MPI) reconstruction method based on a time-domain system matrix and x-space, including: obtaining a voltage signal through MPI scanning based on a Cartesian trajectory; obtaining an original image according to an x-space-based reconstruction method; constructing, based on the voltage signal as well as a velocity compensation step and a grading step in the x-space-based reconstruction method, a forward model for time-domain-based MPI and x-space-based reconstruction; taking the original image as an input of an inverse problem solver of the forward model, and obtaining an optimized particle distribution diagram through solving. Based on the original image obtained through the x-space-based reconstruction, the forward model describing MPI and x-space-based reconstruction processes is established.

Abstract: Disclosed in the present disclosure is a method for smelting a high-temperature alloy with an ultrahigh N content in a VIM furnace, and a high-temperature alloy with an ultrahigh N content. The VIM-furnace smelting method comprises a smelting step performed in a VIM furnace, and a casting step, wherein at a later stage of smelting, a nitrogen-containing substance is added to the VIM furnace to adjust the content of N. In the present disclosure, by comprehensively improving the raw materials, the smelting process, etc., the yield of N during a VIM-furnace smelting process is increased and accurate control over the content of N in the high-temperature alloy is achieved, such that a target content of nitrogen can be guaranteed, and an ideal product can thus be obtained.

Abstract: The present disclosure provides a fast medical hyperspectral image (MHSI) classification method based on similarity tangent mapping, and relates to the technical field of hyperspectral image (HSI) processing. The fast MHSI classification method includes: preprocessing a to-be-classified MHSI; extracting a sample set from the to-be-classified MHSI; dividing the sample set into a training sample set and a test sample set; constructing a cosine similarity tangent mapping (CSTM) model based on the training sample set; and inputting the test sample set into the CSTM model to obtain a classification result. Tangent mapping is performed for a cosine similarity to evaluate a similarity between pixels, and a similarity between a to-be-classified pixel and each different type of training sample is calculated based on a joint local region. Afterwards, a category label of the to-be-classified pixel is allocated based on the similarity to quickly obtain a stable classification result.

Abstract: A preparation method of a zeolite/polyimide composite membrane includes: synthesizing a zeolite-doped polyamic acid precursor casting solution by condensation polymerization synthesis; coating a substrate with the obtained casting solution, and obtaining a zeolite/polyamic acid composite porous membrane by non-solvent induced phase separation; and obtaining the zeolite/polyimide composite membrane by performing thermal imidization on the zeolite/polyamic acid composite porous membrane through gradient heating.

Abstract: A mobile terminal and a mobile terminal antenna production method. The mobile terminal uses an insulation film layer on an insulation rear housing as a carrier of a radiating element of an antenna, and the radiating element is located within the entire mobile terminal. A feed and an electric-conductor are disposed on a circuit board, and the electric-conductor is electrically connected to the feed. There is a gap between the radiating element and the electric-conductor, and the electric-conductor indirectly couples the radiating element in a capacitively coupled manner.

Abstract: An apparatus includes: a shaft rotatable to a plurality of predetermined positions to change a state of an electric switching device; a motor rotating the shaft via a transmission mechanism when the apparatus operates in an electric operating mode; a braking mechanism configured to brake the motor in response to the shaft rotated to each position when operating in the electric operating mode; a disc coupled to, and rotatable with the shaft, and comprising a plurality of blocking parts and slots therebetween; and a manual lever comprising a rotatable part and a projecting part arranged at an end thereto, wherein in an apparatus manual operating mode, the projecting part is rotatable into the disc via one of the slots when the shaft is located at one of the positions, and slides out from the disc via another slot when the shaft is rotated to another one of the positions.

Abstract: A thermoplastic polymer-based composite material and a preparation method thereof are provided. The thermoplastic polymer-based composite material is obtained by impregnating a reinforcing material with a mixture or oligomer of an epoxy resin, a bismaleimide resin, and a bifunctional amine (calculated based on active hydrogen), and then performing an in-situ polymerization. The thermoplastic polymer-based composite material has excellent impregnation effect, excellent secondary processing performance, relatively high heat resistance, excellent flame retardancy, and mechanical properties, and excellent comprehensive performance.

Abstract: A mobile terminal and a mobile terminal antenna production method. The mobile terminal uses an insulation film layer on an insulation rear housing as a carrier of a radiating element of an antenna, and the radiating element is located within the entire mobile terminal. A feed and an electric-conductor are disposed on a circuit board, and the electric-conductor is electrically connected to the feed. There is a gap between the radiating element and the electric-conductor, and the electric-conductor indirectly couples the radiating element in a capacitively coupled manner.

Abstract: A mobile terminal and a mobile terminal antenna production method. The mobile terminal uses an insulation film layer on an insulation rear housing as a carrier of a radiating element of an antenna, and the radiating element is located within the entire mobile terminal, thereby effectively increasing a height of the radiating element of the antenna relative to a circuit board with the antenna not affecting an appearance of the mobile terminal. Compared with a conventional support solution, this manner can increase a height of about 0.2 mm to 0.6 mm. This reduces an impact caused by a metal component on the circuit board on antenna radiation, and further increases a bandwidth and efficiency of the antenna so that the antenna can cover a frequency band used in a handheld communications system.

Abstract: Disclosed is a catalyst for producing ethylbenzene in one-step by vapor phase alkylation reaction of ethanol and benzene. The catalyst has the following features for the reaction: high alkylation reaction activity, high selectivity of ethylbenzene in an alkylation product, high hydrothermal stability and stable catalytic performance. The catalyst comprises a mesoporous-microporous composite TNU-9 molecular sieve and the silicon to aluminum molar ratio, SiO2/Al2O3, of the meso-microporous composite TNU-9 molecular sieve ranges from 50 to 200.

Abstract: Techniques provided herein relate to regulating at least one operating parameter of a paraffinic froth treatment (PFT) operation and controlling the quality of the produced bitumen in response to a determined concentration of at least one residual metal in a PFT process stream. Determination of the residual metal concentration is based on acquired NIR spectral measurements of the PFT process stream. An alkaline agent dosage in primary extraction operation can be for example regulated in response to a difference between a determined calcium concentration and a calcium concentration specification.

Abstract: A thermoplastic polymer-based composite material and a preparation method thereof are provided. The thermoplastic polymer-based composite material is obtained by impregnating a reinforcing material with a mixture or an oligomer of an epoxy resin, a bisphenol A/F, and a catalyst and then performing an in-situ polymerization. The thermoplastic polymer-based composite material is less expensive to produce, has an optimal impregnation effect, excellent secondary processing performance, high heat resistance, desirable mechanical properties and excellent overall performance.

Abstract: Disclosed is a catalyst for producing ethylbenzene in one-step by vapor phase alkylation reaction of ethanol and benzene. The catalyst has the following features for the reaction: high alkylation reaction activity, high selectivity of ethylbenzene in an alkylation product, high hydrothermal stability and stable catalytic performance. The catalyst comprises a mesoporous-microporous composite TNU-9 molecular sieve and the silicon to aluminum molar ratio, SiO2/Al2O3, of the meso-microporous composite TNU-9 molecular sieve ranges from 50 to 200.

Abstract: A thermoplastic polymer-based composite material and a preparation method thereof are provided. The thermoplastic polymer-based composite material is obtained by impregnating a reinforcing material with a mixture or oligomer of an epoxy resin, a bismaleimide resin, and a bifunctional amine (calculated based on active hydrogen), and then performing an in-situ polymerization. The thermoplastic polymer-based composite material has excellent impregnation effect, excellent secondary processing performance, relatively high heat resistance, excellent flame retardancy, and mechanical properties, and excellent comprehensive performance.