Abstract: In a spherical titanium silicalite catalyst and a preparation method therefor, the spherical titanium silicalite catalyst has the following composition: xTiO2·(1?x)SiO2/yMPO4, wherein x is equal to 0.0005-0.04, y is equal to 0.005-0.20, M is a metal element selected from alkaline earth metals, transition metals or combinations of two or more thereof. The spherical titanium silicalite catalyst is prepared by the following method: (i) providing titanium silicalite raw powder with the composition of xTiO2·(1?x)SiO2, wherein x is equal to 0.0005-0.04, and y is equal to 0.005-0.20; (ii) mixing silica sol, an organic template agent and phosphate in proportion to obtain an adhesive; and (iii) mixing the adhesive with the titanium silicalite raw powder, and carrying out spray-drying molding and firing to obtain the titanium silicalite catalyst.

Abstract: In a supported composite oxide catalyst and preparation and use thereof, the catalyst has the general formula: FeMoaSibXcOd, wherein X is a modified metal and is selected from alkali metals or alkaline earth metals; a=0.5-5, b=10-50, c=0.001-0.1, and d is the amount of oxygen element satisfying the chemical valence. The catalyst is prepared with the following method: (i) providing an acidic aqueous solution of a surfactant; (ii) dissolving an iron-containing compound and a complexing agent in the acidic aqueous solution, adding tetra C1-4 alkyl orthosilicate, and performing hydrolysis, crystallization and calcination to obtain a precursor; and (iii) forming a mixed liquid of the precursor, a molybdenum-containing compound and a modifying metal compound, drying same and calcinating the resultant, so as to obtain the supported composite oxide catalyst.

Abstract: In a composite oxide catalyst, a preparation method therefor, and a use thereof, the catalyst has the following general formula: MoFeaAlbPcOx, wherein a=0.25-0.5, b=0.001-0.2, c=0.001-0.6, and x is a number satisfying the valence of the general formula. The catalyst has excellent low-temperature performance and thus has a long service life.

Abstract: A method for training a coal rock interface recognition model is performed by a cloud server. The method includes receiving a sample coal rock distribution and sample multi-modal data from an edge processor, acquiring a sample load state feature based on the sample vibration data and the sample noise data; acquiring a sample cutting feature of a coal rock interface based on the sample video data. The method further includes acquiring a sample load feature for drum cutting based on the sample current data and the sample pressure data; calling the coal rock interface recognition model, and performing a decision-level fusion based on the sample load state feature; and training the coal rock interface recognition model based on the sample predicted coal rock distribution and the sample coal rock distribution to obtain a target coal rock interface recognition model.

Abstract: Provided is a high contrast grating polarizer with adjustable polarization characteristics, relating to the technical field of photoelectric devices. The high contrast grating polarizer includes a transparent substrate; and a plasma metal antenna structure layer, a refractive index electrically-tunable switching layer, a first electrode layer, and a second electrode layer located on the transparent substrate, where the plasma metal antenna structure layer includes a high contrast grating and a plasma metal antenna structure interleaved with the high contrast grating, the high contrast grating includes a semiconductor grating or a dielectric grating, the high contrast grating is used for transmitting light in a first polarization direction, the plasma metal antenna structure is used for reflecting light in a second polarization direction, and the first polarization direction is opposite to the second polarization direction.

Abstract: A method for training a coal rock interface recognition model is performed by a cloud server. The method includes receiving a sample coal rock distribution and sample multi-modal data from an edge processor, acquiring a sample load state feature based on the sample vibration data and the sample noise data; acquiring a sample cutting feature of a coal rock interface based on the sample video data.

Abstract: The present disclosure provides a vertical cavity surface emitting laser, relating to the technical field of photoelectric devices. The vertical cavity surface emitting laser includes a substrate layer, a buffer layer, a first reflector layer, a light emitting layer, a polarization selective hybrid layer and an electrode layer that are stacked. The polarization selective hybrid layer includes a second reflector layer and a near wavelength grating layer integrated above the second reflector layer, where a period of a near wavelength grating is smaller than a wavelength of light in a propagating medium and larger than a wavelength of light in a semiconductor material of the vertical cavity surface emitting laser. The vertical cavity surface emitting laser can emit highly stable and highly polarized laser light, and is simple in structure and convenient to fabricate. The second reflector layer is thinner, which reduces the production cost.

Abstract: Provided is a high contrast grating polarizer, which relates to the technical field of photoelectric devices. The polarizer includes a substrate, a high contrast grating on the substrate and a plasmonic metal antenna structure interleaved with the high contrast grating, where the high contrast grating includes a semiconductor grating or a dielectric grating; and the high contrast grating is configured to transmit light of a first polarization direction, the plasmonic metal antenna structure is configured to reflect light of a second polarization direction, and the first polarization direction is opposite to the second polarization direction.

Abstract: Disclosed are a spherical titanium silicalite catalyst and a preparation method therefor. The spherical titanium silicalite catalyst has the following composition: xTiO2·(1?x)SiO2/yMPO4, wherein x is equal to 0.0005-0.04, y is equal to 0.005-0.20, M is a metal element selected from alkaline earth metals, transition metals or combinations of two or more thereof. The spherical titanium silicalite catalyst is prepared by the following method: (i) providing titanium silicalite raw powder with the composition of xTiO2·(1?x)SiO2, wherein x is equal to 0.0005-0.04, and y is equal to 0.005-0.20; (ii) mixing silica sol, an organic template agent and phosphate in proportion to obtain an adhesive; and (iii) mixing the adhesive with the titanium silicalite raw powder, and carrying out spray-drying molding and firing to obtain the titanium silicalite catalyst.

Abstract: Disclosed are a composite oxide catalyst, a preparation method therefor, and a use thereof. The catalyst has the following general formula: MoFeaAlbPcOx, wherein a=0.25-0.5, b=0.001-0.2, c=0.001-0.6, and x is a number satisfying the valence of the general formula. The catalyst of the present invention has excellent low-temperature performance and thus has a long service life.

Abstract: Disclosed are a supported composite oxide catalyst and preparation and use thereof. The catalyst has the general formula: FeMoaSibXcOd, wherein X is a modified metal and is selected from alkali metals or alkaline earth metals; a=0.5-5, b=10-50, c=0.001-0.1, and d is the amount of oxygen element satisfying the chemical valence. The catalyst is prepared with the following method: (i) providing an acidic aqueous solution of a surfactant; (ii) dissolving an iron-containing compound and a complexing agent in the acidic aqueous solution, adding tetra C1-4 alkyl orthosilicate, and performing hydrolysis, crystallization and calcination to obtain a precursor; and (iii) forming a mixed liquid of the precursor, a molybdenum-containing compound and a modifying metal compound, drying same and calcinating the resultant, so as to obtain the supported composite oxide catalyst.

Abstract: The disclosure provides a Bending-type Friction Steel Truss Coupling Beam, which can be rapidly repaired following an earthquake event. It comprises an upper chord, a lower chord, a diagonal web member, a web member, a T-shaped plate and a friction device. The friction device is located at both ends of the lower chord, where large deformation may occur. The friction device comprises a T-shaped friction main plate, a friction plate, a cover plate and a friction bolt. The disclosure uses a friction device to dissipate energy based on a common steel truss coupling beam. Different sliding loads can be designed according to the seismic precautionary intensity of different regions. The disclosure has the advantages of simple structure, immediate occupancy and low repair cost.

Abstract: System and methods are provided for dynamic performance adjustment of a media playing pipeline. For example, the media playing pipeline includes one or more components synchronized for media playing. A reference component in the media playing pipeline is selected, the reference component having a component performance level. A pipeline performance level of the media playing pipeline is determined. When the pipeline performance level is higher than a threshold, the component performance level of the reference component is adjusted to decrease the pipeline performance level. When the pipeline performance level is lower than the threshold, the component performance level of the reference component is adjusted to increase the pipeline performance level.