Abstract: A single-layer three-section rail-type planar robot containing a double parallelogram, is composed of a stationary platform, a motion platform and three branched chains with the same structure connecting the stationary platform and the motion platform, the stationary platform is provided with three planar curved rails, each planar curved rail is connected to the motion platform through a branched chain, and each branched chain includes a slider, two link bars I arranged in parallel, two link bars II arranged in parallel, and link bar III, select one revolute joint I in each branched chain to form three revolute joints I as the main driving joint or three sliders as the driving parts.

Abstract: The present disclosure provides a method for controlling an amount of silicon added to ductile cast iron, a method for casting ductile cast iron, and a cast product, which relate to the technical fields of metallurgical and cast iron alloys. The method for controlling an amount of silicon added to ductile cast iron includes smelting ductile cast iron using scrap steel as a raw material. After the scrap steel is melted into molten iron, a copper alloy is added so that the molten iron has a copper equivalent of 0.8% to 1.0%, wherein the copper equivalent is controlled by formula (II). Then, ferrosilicon is added so that the content of silicon added to the molten iron satisfies formula (I).

Abstract: A large-load unmanned aerial vehicle (UAV) for plant protection with adjustable spraying swath and pesticide application amount is provided, relating to the technical field of pesticide application of unmanned aerial vehicles. The large-load unmanned aerial vehicle for plant protection comprises a large-load unmanned aerial vehicle, a pesticide box, a variable pesticide application system, and adjustable spraying swath mechanisms, wherein the pesticide box is fixed to landing gears of the unmanned aerial vehicle and is positioned below a control platform of the unmanned aerial vehicle; the adjustable spraying swath mechanisms are arranged on the landing gears, the variable pesticide application system is connected with the pesticide box and the adjustable spraying swath mechanisms, the variable pesticide application system and the adjustable spraying swath mechanisms are electrically connected with the control platform, and the control platform is in communication connection with a remote control handle.

Abstract: A method for judging freshness of cultured fish product based on eye image recognition is provided, which relates to the field of image processing and includes the following steps: obtaining eye area and eye center point of each cultured fish product; obtaining a first data category and a second data category of each gray scale change sequence according to each gray scale change sequence of each eye area; calculating a first mean value and a second mean value of each gray scale change sequence; obtaining the fish eye turbidity of each eye area according to the first mean value and the second mean value; obtaining the fish eye plumpness of each eye area according to the first data category and the second data category; and obtaining the freshness of each cultured fish product according to the fish eye turbidity and fish eye plumpness in each eye area.

Abstract: A corn ear picking roller structure for strengthening stem grabbing includes a header, a seedling divider, a seedling pulling chain, a clamping chain, a seedling pressing plate, and an ear picking device. The seedling divider is connected to a front end of the header, the seedling pulling chain is connected to the header and located on a lower side of the seedling divider, the clamping chain is connected to the header and located on a lower portion of the seedling pulling chain, the ear picking device is connected to the header and located on one side of the seedling divider, and the seedling pressing plate is connected to a top end of the ear picking device. The ear picking device includes a left ear picking roller and a right ear picking roller, and each of the left and right ear picking rollers is provided with an inequilateral multi-edge structure.

Abstract: A system and a method for controlling a reel of a combine harvester, wherein, the system comprises a satellite positioning receiver, a driving device, a controller and a rotating speed sensor; the rotating speed sensor collects and transmits an actual rotating speed of the reel to the controller, and the controller provides the driving device with a speed regulation signal according to the actual rotating speed and the operation running speed. The rotating speed of the reel can be automatically, accurately and quickly adjusted according to the operation running speed of the combine harvester during the operation of the combine harvester, and improve the operation efficiency and quality while ensuring the crop feed quantity.

Abstract: An annular shaped-charge and blasting housing and a use method thereof are provided. The annular shaped-charge and blasting housing includes a PVC segment and multiple notch grooves. Grooves are notched on a W-shaped PVC segment formed by machining. The notching angle of the groove and the spacing distance between the grooves can be adjusted according to use requirements. And, the W-shaped PVC segment after being cut may not be limited to have eight notch grooves, and the number of the notch grooves of a single one PVC segment can be adjusted according to actual working conditions. The PVC segment can be folded and closed to form the annular shaped-charge and blasting housing. Therefore, the housing of the embodiments is simple in production, the linear segment can be bended and folded by utilizing the plasticity of the PVC material. The manufacturing process of the housing is simple and feasible.

Abstract: A large-load unmanned aerial vehicle (UAV) for plant protection with adjustable spraying swath and pesticide application amount is provided, relating to the technical field of pesticide application of unmanned aerial vehicles. The large-load unmanned aerial vehicle for plant protection comprises a large-load unmanned aerial vehicle, a pesticide box, a variable pesticide application system, and adjustable spraying swath mechanisms, wherein the pesticide box is fixed to landing gears of the unmanned aerial vehicle and is positioned below a control platform of the unmanned aerial vehicle; the adjustable spraying swath mechanisms are arranged on the landing gears, the variable pesticide application system is connected with the pesticide box and the adjustable spraying swath mechanisms, the variable pesticide application system and the adjustable spraying swath mechanisms are electrically connected with the control platform, and the control platform is in communication connection with a remote control handle.

Abstract: Disclosed is an organic amine salt foaming agent, that is, a composite polyurethane foaming agent, comprising: 1) hexafluorobutene; and 2) an alkanolamine salt mixture (MAA), the alkanolamine salt mixture (MAA) contains an organic amine salt compound having the following general formula (I): An?[Bm+]p (I); wherein An? is one or two or three selected from the following anions: (b) carbonate: CO32?; (c) formate: HCOO?; (d) bicarbonate: HO—COO?. A polyurethane foaming method using carbon dioxide and an organic amine in combination is also disclosed, in which carbon dioxide is added to a polyurethane composition for foaming. A method for preparing an alkanolamine carbonate salt with low water content from ammonium carbonate and an epoxide is additionally disclosed, in which a liquid alkanolamine salt mixture is used as a dispersion medium or as a solvent for reaction raw material.

Abstract: A shrimp shell separation and cleaning device for Euphausia superba comprises a hollow main body; a screening cylinder installed rotationally inside the main body and having a bottom installed with a filter screen; a stirring assembly provided rotationally inside the main body and comprising a cylindrical cam installed inside the screening cylinder, wherein a sleeve frame is sleeved over the cylindrical cam, stirring rods are provided on the sleeve frame in an array mode and rotationally installed on the sleeve frame through driving grooves, the driving grooves run through the sleeve frame and each have one end, which penetrates through the sleeve frame, rotationally installed in one driving groove of the cylindrical cam, and the sleeve frame is arranged in self-rotating manner; a feeding port installed fixedly on communicating with the main body; and a spray head arranged fixedly inside the main body for spraying water into the screening cylinder.

Abstract: An driving motor with hybrid excitation of electromagnetism and invisible magnetic pole, wherein each magnetic pole comprises two first magnets, one second magnet and one third magnet; wherein the first magnet is placed along a diameter direction of a rotor core, the second magnet is located at a middle and lower portion of two first magnets of each magnetic pole corresponding to the second magnet at a diameter direction, and a magnetic isolation groove is disposed at an inner end of the first magnet and extends toward two sides of the inner end of the first magnet. The magnetic isolated air gap can adjust a spatial distribution of a magnetic field generated by permanent magnets of each pole to replace the permanent magnets, so as to save the number of the permanent magnets, reduce the weight of the motor, and reduce the cost of the motor.

Abstract: A lithium salt easily soluble in an organic solvent and having a flame-retardant function and a lithium-ion battery flame-retardant electrolyte thereof are provided. The lithium salt is poly(lithium phosphate) phosphazene partially substituted by alkyl aromatic oxy groups, and has a structural general formula: [(R—Ar—O)x(P?N)n(Li2O3P)2n-x]. The novel flame-retardant electrolyte is compounded from the lithium salt and a phosphate intermediate thereof [(R—Ar—O)x(P?N)n(R?2O3P)2n-x] according to a mass ratio of 10:1-1:1. The electrolyte is easily soluble in an organic solvent. A liquid electrolyte is prepared according to an amount of 8%-45% to obtain the novel flame-retardant liquid electrolyte. The liquid electrolyte has good lithium ion conductivity and good flame-retardant properties, and is used in lithium-ion batteries, lithium-sulfur batteries, lithium carbon fluoride batteries or lithium-oxygen batteries.

Abstract: The present invention relates to the technical field of gene engineering and particularly relates to a method for constructing non-de novo synthesized Mucor circinelloides recombinant strain with high lipid yield, recombinant strain constructed by method, and application of recombinant strain. According to the present invention, a diacylglycerol acyltransferase gene (DGAT) is overexpressed in Mucor circinelloides WJ11 by a homologous recombination technology, and exogenous oil is added for fermentation, such that the non-de novo synthesized Mucor circinelloides recombinant strain with high lipid yield is constructed. Compared with the control strain Mc2075, the fat yield of the Mucor circinelloides is increased; and when the diacylglycerol acyltransferase (DGAT) is transformed into the uracil defective type of Mucor circinelloides WJ11, the fatty acid composition changes after fermentation, and the lipid content may reach 53% of dry cell weight after the fermentation condition is optimized.

Abstract: The present disclosure provides a method for controlling an amount of silicon added to ductile cast iron, a method for casting ductile cast iron, and a cast product, which relate to the technical fields of metallurgical and cast iron alloys. The method for controlling an amount of silicon added to ductile cast iron includes smelting ductile cast iron using scrap steel as a raw material. After the scrap steel is melted into molten iron, a copper alloy is added so that the molten iron has a copper equivalent of 0.8% to 1.0%, wherein the copper equivalent is controlled by formula (II). Then, ferrosilicon is added so that the content of silicon added to the molten iron satisfies formula (I).

Abstract: The present invention discloses an opposite belt-type precise seeding device. The opposite belt-type precise seeding device comprises a seed metering tube consisting of a U-shaped shell and a cover plate, two conveying devices provided inside the seed metering tube in parallel, and a conveying plate provided at the lower end of the seed metering tube. The opposite belt-type precise seeding device belongs to the field of agricultural machinery. In a seeder, a tubular seed conveying tube is usually used for guiding movement of seeds, but the movement of the seeds in the seed conveying tube has certain randomness, so that the seed distance consistency of the seeds in a seed bed is reduced. Through control of the seeds by the conveying devices, the stable movement of the seeds is achieved and the seed distance consistency of the seeds in the seed bed is guaranteed.

Abstract: The disclosure relates to a method for producing levulinic acid in a molten salt hydrate from cellulose hydrolysis. An inorganic molten salt hydrate was prepared by mixing an inorganic salt with water, cellulose is added and stirred to dissolve, a solid catalyst is added and heated up for reaction to obtain a reactant, the reactant is cooled and subjected to a separation to obtain the levulinic acid, and the inorganic molten salt hydrate and the solid catalyst obtained after the separation are recycled, wherein the inorganic salt is one or more selected from the group consisting of LiCl, LiBr, CaBr2, Ca(NO3)2, LiNO3 and KNO3.

Abstract: The polyurethane flame retardant is prepared by compounding poly(diphosphophosphazene) (PDPP) and derivatives thereof, poly(diphosphate phosphazene) (MPDPP) (where M=Mg2+, Ca2+, transition metal ions, rare earth ions and the like) and poly(diphosphonic phosphazene). Since a phosphate group in the PDPP and an unreacted phosphate group in the MPDPP in the compound and an unreacted hydroxyl in the phosphate group may react with isocyanate, the flame retardant is a reactive flame retardant. Due to the reaction between the flame retardant and the isocyanate, the flame retardant is uniformly distributed in polyurethane and has a better flame-retardant effect. The flame retardant contains multiple flame-retardant components, namely polyphosphazene group, phosphate ester and phosphate salt. Due to the synergistic effect, the flame retardant has good flame-retardant properties, and can be used for various polyurethane materials.

Abstract: The present disclosure relates to a construction method of a Mucor circinelloides cell factory for producing dihomo-?-linolenic acid and a fermentation technology, belonging to the field of genetic engineering. In the present disclosure, ?-linolenic acid elongase gene glelo is obtained from Mortierella alpine by cloning, the gene is ligated to an integrative plasmid pMAT1552, and transformed into a Mucor circinelloides defective strain Mu402, and the gene glelo is integrated into Mucor circinelloides genome through homologous recombination, to obtain the recombinant strain Mc-glelo, and finally, the expression of the gene glelo in Mucor circinelloides is realized. The lipid content in the recombinant strain Mc-glelo is not obviously different from that in the control strain Mc1552, however, the lipid composition changes greatly, and dihomo-?-linolenic acid appears in the lipids of the recombinant strain Mc-glelo, and the content thereof reaches 5.7% of the total fatty acids.

Abstract: A method for fault location to multi-terminal traveling wave in a direct current distribution line, which belongs to the field of power line fault ranging and location technology. The method includes a main site and a plurality of acquisition points installed into the distribution line and includes steps as follows. Step 1001: collecting and uploading a traveling wave signal by each of the acquisition points after a fault occurs in the line; step 1002: generating a fault record set; step 1003: computing the shortest paths from a central site to other sites and their lengths; step 1004: using expanded two-terminal traveling wave ranging principle for pairing computation; step 1005: converting positions of possible disturbance points into possible disturbance occurrence time points; step 1006: extrapolating from equal path lengths of the possible disturbance points to obtain disturbance time data; and step 1007: determining a final disturbance point.

Abstract: The present application discloses a dicarboxylic acid transporter and its encoding gene dit gene for increasing oil yield of Mucor circinelloides, the dit gene is cloned from the high-yield M. circinelloides WJ11, and the dit gene is transformed into M. circinelloides deficient strain Mu402, the dit gene is integrated into the genome of M. circinelloides by homologous recombination to obtain recombinant strain Mc-Dit. The total fatty acid content of the Mc-Dit strain increased by 33.76% and the intracellular lipid content may reach up to 17.67% of the dry biomass.