Abstract: A box-type speed change device includes a box body, a main shaft, a countershaft, a main shaft gears, a countershaft gear and a ratchet. The main shaft and the countershaft are provided in the box body in parallel, the main shaft gear is provided on the main shaft, the countershaft gear meshing with the main shaft gear is provided on the countershaft, and the ratchet meshing with the main shaft gear or/and the countershaft gear is slidably provided on the main shaft and/or the countershaft.

Abstract: A box-type speed change device includes a box body, a main shaft, a countershaft, a main shaft gears, a countershaft gear and a ratchet. The main shaft and the countershaft are provided in the box body in parallel, the main shaft gear is provided on the main shaft, the countershaft gear meshing with the main shaft gear is provided on the countershaft, and the ratchet meshing with the main shaft gear or/and the countershaft gear is slidably provided on the main shaft and/or the countershaft.

Abstract: A polypropylene microsphere and a preparation method therefor, a 3D printing raw material, and a use are provided. The polypropylene microsphere contains 0.2 wt %-10 wt % of a structural unit derived from ethylene and 90 wt %-99.8 wt % of a structural unit derived from propylene. A melting heat absorption curve of the polypropylene microsphere is obtained by means of a differential scanning calorimeter (DSC), and a half-peak width (Wm) of the melting heat absorption curve of the polypropylene microsphere is 4-10° C. The crystallization sequence distribution of the polypropylene microsphere is uniform, and when the polypropylene microsphere is used for 3D printing, 3D printing melting is uniform.

Abstract: This application discloses a processing method, applied to an electronic device, wherein the electronic device comprises an application processor, a microcontroller unit, and a speaker. The application processor receives a first input, wherein the first input is used to trigger the electronic device to play a first audio by using a first application. The application processor sends a first message to the microcontroller unit in response to the first input. When the microcontroller unit determines, based on the first message, that the microcontroller unit supports playing of the first audio, the microcontroller unit sends a second message to the application processor. The microcontroller unit controls the speaker to play the first audio, and the application processor switches to a sleep state, after the microcontroller unit sends the second message to the application processor.

Abstract: A carrier for an olefin polymerization catalyst contains a magnesium-containing compound and sulfur. The sulfur is at least one of an elemental sulfur, a complex sulfur, and a compound sulfur. The carrier has good particle morphology and a smooth surface, and has a narrow particle size distribution. The catalyst prepared from the carrier has high activity and good sensitivity to hydrogen regulation, and can improve the density of a polymer stack when being used for olefin polymerization.

Abstract: A graphics primitive sharing method is provided and is related to the terminal field. When drawing interface content, a secondary chip in an electronic device obtains a set of controls corresponding to interface content. The secondary chip delegates a control whose drawing effect is poor in the set of controls to a primary chip to perform drawing. The secondary chip composites a graphics primitive drawing result of the secondary chip and a graphics primitive drawing result of the primary chip, and sends a composited result to a display.

Abstract: Data dividers with partition identifiers are described for use in data analytics for streaming data. A continuous flow of data items received by a network-based data analytics service may be discretized into data buckets based on a time window associated with each of the data buckets receiving the data items from the data stream Data dividers may be generated based on a number of partitions determined to be necessary to implement parallel processing of the data items and each partition may include the data items to be processed as well as a single data divider ordered at the end of the partition such that the data divider is the last item to be processed. In this way, the network-based data analytics service may determine that all of the data items for a given data bucket have been processed once all of the data dividers have been processed.

Abstract: Disclosed are a catalyst component and a catalyst for olefin polymerization, and an olefin polymerization method. The catalyst component comprises magnesium, titanium, a halogen and an internal electron donor, wherein the internal electron donor comprises a monocarboxylic acid ester compound and a diether compound, and the molar ratio of the monocarboxylic acid ester compound to the diether compound is (0.0035-0.7):1. By using the catalyst, a polymer having both a high isotactic index and a high melt flow index can be prepared.

Abstract: This application discloses an image processing method and apparatus, a storage medium, an electronic device, and a product, and relates to the field of computer technology. This application can be applied to the technical fields of artificial intelligence, a map vehicle network, and a blockchain. The method includes acquiring a pre-set image template, the pre-set image template comprising an image pre-synthesis area, and the image pre-synthesis area being used for synthesizing a predetermined type of image content; identifying a target image file; performing synthesis pre-processing on target image content in the target image file to generate an image to be synthesized, the target image content being the predetermined type of image content; and fusing the image to be synthesized to the image pre-synthesis area to generate a target image.

Abstract: A solid component for preparing an olefin polymerization catalyst, and a preparation method therefor and an application thereof are provided. The solid component contains: (i) a magnesium compound as represented by the following formula (1), (ii) a Lewis base (LB), and optionally, (iii) metal components other than magnesium. The LB is a compound as shown in general formula (II) or an amide compound as shown in general formula (II?). The solid component has a better particle morphology, and a catalyst prepared by using the solid component as a carrier is less likely to be crushed, and has better stereostructural orientation in olefin polymerization, particularly in propylene polymerization or copolymerization.

Abstract: A spherical carrier for olefin polymerization catalysts has at least one magnesium-containing compound having a structure represented by formula (1). The spherical carrier has a relatively good particle morphology, and substantially no abnormally morphological particles will appear. A method for preparing the spherical carrier can be used to prepare a carrier having a small particle size and greatly expands the particle size range of the preparable carrier. When the catalyst prepared by using the carrier is used for olefin polymerization, polymerization activity is good, substantially no abnormally morphological material is present, and hydrogen response is good.

Abstract: A copolymer contains, based on the total amount of structural units of the copolymer, 90-99 mol % of propylene structural units and 1-10 mol % of butene structural units. The xylene solubles content of the copolymer is less than or equal to 4 wt %, and preferably less than or equal to 3 wt %. The propylene-butene copolymer is substantially free of fraction having a molecular weight lower than 1000. The copolymer has a melt flow index of greater than or equal to 20 g/10 min as measured at 230° C. under a load of 2.16 kg. The propylene-butene copolymer has a high melt flow index and few xylene solubles, and does not contain a phthalate-type plasticizer, and can be used in fields such as food and medical and health services.

Abstract: The present disclosure relates to multi-functional anti-microbial polymers comprising a first monomer having a polymerizable cyclic aromatic moiety which forms part of the backbone of the polymer and a second monomer having an ethylenically unsaturated monomer having a double or triple bond and a quaternary ammonium or quaternary phosphonium moiety.

Abstract: A carrier for an olefin polymerization catalyst contains a magnesium-containing compound and sulfur. The sulfur is at least one of an elemental sulfur, a complex sulfur, and a compound sulfur. The carrier has good particle morphology and a smooth surface, and has a narrow particle size distribution. The catalyst prepared from the carrier has high activity and good sensitivity to hydrogen regulation, and can improve the density of a polymer stack when being used for olefin polymerization.

Abstract: Disclosed are a catalyst component and a catalyst for olefin polymerization, and an olefin polymerization method. The catalyst component comprises magnesium, titanium, a halogen and an internal electron donor, wherein the internal electron donor comprises a monocarboxylic acid ester compound and a diether compound, and the molar ratio of the monocarboxylic acid ester compound to the diether compound is (0.0035-0.7):1. By using the catalyst, a polymer having both a high isotactic index and a high melt flow index can be prepared.

Abstract: Improved electrically conductive pili were generated from a natural pilus protein from the microorganism Geobacter sulfurreducens. Substituting a tryptophan for the phenylalanine at position F51 and a tryptophan for the tyrosine at position Y57 of the pilus monomer substantially increased the conductivity of the pili and reduced their diameter to 1.5 nm. Substantial improvements in conductivity were also achieved by substituting an additional tyrosine, histidine, and phenylalanine in the pilus monomer to mimic the monomer of Geobacter metallireducens, but the pili retained the typical Geobacter sulfurreducens wild-type diameter of 3 nm.

Abstract: A fishing tackle module is provided for removable attachment to the rim of a bucket. The module includes a curved body member having a flanged leading edge adapted for engagement with the rim of a bucket, a trailing edge, and a surface that extends between the flanged leading edge and the trailing edge; a plurality of enlarged openings formed through the surface at spaced intervals; a plurality of apertures formed through the surface at spaced intervals adjacent the trailing edge; and a sheath engaged with and extending downwardly from one of the enlarged openings.

Abstract: Improved electrically conductive pili were generated from a natural pilus protein from the microorganism Geobacter sulfurreducens. Substituting a tryptophan for the phenylalanine at position F51 and a tryptophan for the tyrosine at position Y57 of the pilus monomer substantially increased the conductivity of the pili and reduced their diameter to 1.5 nm. Substantial improvements in conductivity were also achieved by substituting an additional tyrosine, histidine, and phenylalanine in the pilus monomer to mimic the monomer of Geobacter metallireducens, but the pili retained the typical Geobacter sulfurreducens wild-type diameter of 3 nm.

Abstract: The present disclosure relates to a cellulose-polymer composite solar cell that is substantially biodegradable and fabricated using environmentally friendly materials and methods. The polymer solar cell comprises an electrically conductive cellulose-polymer composite and an electrically semiconductive cellulose-polymer composite.