Abstract: A method of hydrolysis of dimethyl succinyl succinate includes: adding DMSS and water to a reactor, and stirring; adding a phase transfer catalyst to the reactor, and heating; and adding an acid and a transition metal salt to the reactor for hydrolysis of DMSS. The acid is sulfuric acid, hydrochloric acid or nitric acid, and the W ion concentration of the mixture in the reactor is 0.2-12 mol/L. The transition metal salt is a nitrate, sulfate, or chloride of copper, nickel, zinc or manganese, or a combination thereof; and the metal ion concentration of the mixture in the reactor is 0.01-0.1 mol/L.

Abstract: A lignocellulose nanofibril material, a stable foam system based thereon, a preparation method and an application thereof are provided. The lignocellulosic nanofibril material includes the following components: 0.5-20 wt % of wood flour, 0.1-10 wt % of (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl, 2-25 mmol/g of an oxidant, 6-15 wt % of NaBr, and the remaining is water. The stable foam system based on the lignocellulosic nanofibril material includes: 0.1-1.0 wt % of the lignocellulosic nanofibril material, 0.2-1.0 wt % of a surfactant, 0.1-10 wt % of sodium chloride, 0.1-1.0 wt % of calcium chloride, 0.1-1.0 wt % of magnesium chloride, 0.1-1.0 wt % of sodium sulfate, and a balance of water.

Abstract: A method for preparing a nano spherical oxide dispersion strengthening phase using a micron oxide is proposed for the first time. First, a micron oxide is used as a raw material to prepare a nano oxide with a completely amorphous structure/matrix alloy composite powder by mechanical ball milling in stages. In the first stage, ball milling is performed, causing the oxide to break and transform in structure, and achieving nano-sizing and completely amorphization, to prepare a composite powder with a completely amorphous structure nano oxide uniformly distributed in the matrix alloy powder; and in the second stage, the composite powder obtained in the first stage and the remaining matrix alloy powder are uniformly mixed by ball milling. Then, the uniformly mixed powder is sequentially subjected to hot forming, hot rolling, and heat treatment, to obtain a nano spherical oxide dispersion strengthened alloy.

Abstract: A thermoplastic elastomer for profile control and water shutoff is prepared from the following raw materials in parts by weight: 8-10 parts of a component A, 1-3 parts of a strong acid, 1-3 parts of a hydrophobic modifier and 100-105 parts of water. The component A is one of polyethylene glycol, polyvinylether, polyvinyl alcohol, copolymer of acrylamide and acrylonitrile. The strong acid is one of concentrated hydrochloric acid and concentrated sulfuric acid. The hydrophobic modifier is any one of formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, ?-propiolactone, ?-butyrolactone, ?-valerolactone, methyltriacetylsilane, methyltrimethylsilane, butyl acrylate and ethylene glycol dimethacrylate. The thermoplastic elastomer for profile control and water shutoff provided by the disclosure has the advantages of one-step preparation and molding, strong deformation capability, temperature resistance, salt tolerance, strong stability and the like, and is suitable for large-scale production and application.

Abstract: A method for preventing cracking of nickel-based superalloy fabricated by selective laser melting (SLM) belongs to the field of additive manufacturing (AM). The method of preparing an as-built part with a high density, no crack defects, and good mechanical properties includes: reducing the content of elements Zr and B forming low melting point phase in a nickel-based superalloy, adjusting the total content of Al and Ti in the alloy to 4.5 wt % or below, and combining with the control of special SLM process parameters. The new method has the advantages of a reasonable component design, a simple preparation process, and good performance of the as-built part, and therefore is suitable for large-scale application.

Abstract: A nickel-based superalloy for three-dimension (3D) printing and a powder preparation method thereof are provided. The method of preparing the nickel-based superalloy and its powder includes: RE microalloying combined with vacuum melting, degassing, refining, atomization with reasonable parameters, and a sieving process. The new method significantly reduces the cracking sensitivity of the “non-weldable” PM nickel-based superalloys, and broadens the 3D printing process window. The as-printed part has no cracks, and good mechanical properties. In addition, the powder prepared by the new method has higher sphericity and better flowability, and less irregular powders. The yield of fine powders with a particle size of 15-53 ?m and medium-sized powders with a particle size of 53-106 ?m that are required for 3D printing is greatly improved, which meet the requirements for 3D printing of high-quality, low-cost nickel-based superalloy powder.

Abstract: A compound represented by formula (I) or a tautomer, an optical isomer, a nitrogen oxide, a solvate, a pharmaceutically acceptable salt or prodrug thereof are useful for treating or relieving an HIF-related and/or EPO-related disease or condition in patient. The preparation method for the compound, and use of a drug composition containing the compound and the compound or the drug composition in preparation of a drug are also provided.

Abstract: A downhole rock debris extraction system is provided. The downhole rock debris extraction system includes a downhole marking component, a ground control component and a ground detection and extraction component. The downhole marking component is arranged at a drill bit for underground excavation or near the drill bit, and is configured to mark rock debris by spraying different types of markers in real time during the underground excavation performed by the drill bit; the ground detection and extraction component is configured to detect the types of the markers on the rock debris; and the ground control component is configured to manage and control the downhole marking component to mark the rock debris, and to manage and control the ground detection and extraction component to determine the types of the markers on the rock debris. Furthermore, a control method for the downhole rock debris extraction system is provided.

Abstract: A lignocellulose nanofibril material, a stable foam system based thereon, a preparation method and an application thereof are provided. The lignocellulosic nanofibril material includes the following components: 0.5-20 wt % of wood flour, 0.1-10 wt % of (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl, 2-25 mmol/g of an oxidant, 6-15 wt % of NaBr, and the remaining is water. The stable foam system based on the lignocellulosic nanofibril material includes: 0.1-1.0 wt % of the lignocellulosic nanofibril material, 0.2-1.0 wt % of a surfactant, 0.1-10 wt % of sodium chloride, 0.1-1.0 wt % of calcium chloride, 0.1-1.0 wt % of magnesium chloride, 0.1-1.0 wt % of sodium sulfate, and a balance of water.

Abstract: The present disclosure relates to the field of additive manufacturing and superalloys, particularly to a method for eliminating cracks in René 104 nickel-based superalloy prepared by laser additive manufacturing. For solving the problem that cracks are easily generated during laser additive manufacturing of René 104 nickel-based superalloy with high content of Al and Ti (Al+Ti>5 wt. %), generation of large-size cracks inside a fabricated part is suppressed by means of designing laser forming parameters and a partition scanning strategy; then stress relief annealing is performed to completely eliminate residual stress inside the fabricated part; and a spark plasma sintering process is performed to eliminate cracks inside the fabricated part and suppress the growth of grains during the sintering process.

Abstract: A medical suspension bridge includes a cross beam, a suspension pipe and a moving module. The cross beam is connected with the suspension pipe. The moving module is movably connected with the cross beam. The cross beam includes a load-bearing beam. The moving module includes a cable carrier moving plate extending to the upper portion of the load-bearing beam. The medical suspension bridge further includes a cable carrier. One end of the cable carrier is connected to the load-bearing beam, and the other end is connected to the cable carrier moving plate. Since cables such as electric wires and air pipes within a box body which needs to be moved are collectively mounted within the cable carrier, not only the routing is more tidy, but also the cables can be well protected.

Abstract: A bipolar plate of a proton exchange membrane fuel cell is prepared from graphite powder, thermosetting resin and an electrically conductive polymer. The electrically conductive polymer has good electrically conductive properties, and can be cured by heating, which improves the strength and air tightness while ensuring the electrical conductivity of the graphite/thermosetting resin composite bipolar plate. A method of preparing the bipolar plate is further provided, including dispersing the graphite powder in a first organic solvent to obtain a first mixture; dispersing the electrically conductive polymer in a second organic solvent to obtain a second mixture; uniformly mixing the first mixture and the second mixture followed by heating and drying to obtain a powder mixture; mixing, the powder mixture and the thermosetting resin followed by ball milling, thermal press curing, cooling and demolding to obtain the bipolar plate.

Abstract: An in-car temperature-controlling device for a car in its parked state uses a wireless remote control to remotely control a power-activating unit, an engine-starting unit, a window-activating unit and an AC-activating unit of the car, so as to adjust the car's in-car temperature. Its installation is easy and needs no structural changes to the car, so the car using the device can, in its parked state, have its in-car temperature prevented from being too high or too low. The in-car temperature-controlling device is characterized in contributing to convenience, safety, comfort and low costs, and is applicable to all existing and newly built cars.

Abstract: An exemplary embodiment of the disclosure provides a reference voltage generation circuit which includes a unit switch circuit and a voltage output circuit. The unit switch circuit is configured to receive a control voltage and generate a plurality of base voltages on a detection point inside the reference voltage generation circuit. The voltage output circuit is coupled to the unit switch circuit and is configured to modify a reference voltage for generating a specific voltage according to the base voltages. Therefore, an influence on the reference voltage due to process variation can be reduced.

Abstract: A keyswitch assembly is provided. The keyswitch assembly includes a keyswitch module having a key cap, a light guiding member disposed above an outer surface of the key cap and a light source module disposed corresponding to the light guiding member. The light guiding member has a first surface adjacent to the key cap and a second surface facing away from the key cap and opposite the first surface. The light source module provides a light beam incident to the light guiding member. In the invention, the illumination effect of the keyswitch assembly is improved and the power consumption of the keyswitch assembly is reduced by way of disposing the light guiding member of the keyswitch assembly above the outer surface of the key cap.

Abstract: A keyswitch assembly is provided. The keyswitch assembly includes a keyswitch module having a key cap, a light guiding member disposed above an outer surface of the key cap and a light source module disposed corresponding to the light guiding member. The light guiding member has a first surface adjacent to the key cap and a second surface facing away from the key cap and opposite the first surface. The light source module provides a light beam incident to the light guiding member. In the invention, the illumination effect of the keyswitch assembly is improved and the power consumption of the keyswitch assembly is reduced by way of disposing the light guiding member of the keyswitch assembly above the outer surface of the key cap.

Abstract: A keyswitch assembly is provided. The keyswitch assembly includes a base plate, at least one pressing mechanism disposed on the base plate, a plurality of elastic supporting members disposed on the base plate, and a keycap covering the at least one pressing mechanism and the plurality of elastic supporting members. In the embodiments, a plurality of elastic supporting members is disposed at equal intervals to support the keycap. By way of such configuration, the user experiences the same or similar hand feeling when pressing any point of the keycap. There is no difference in the pressing feel due for pressing the middle or two ends of the keycap. Meanwhile, the problem of the poor electrical conduction resulted from the deformation of the keycap may be avoided.

Abstract: The present disclosure provides a diaphragm set for a stethoscope having a chest piece. The diaphragm set includes a diaphragm having a bottom structure and a side structure connected to an edge of the bottom structure. The bottom structure and the side structure of the diaphragm form a diaphragm cavity for receiving the chest piece of the stethoscope.

Abstract: An exemplary embodiment of the disclosure provides a random data generation circuit which includes a phase difference detection circuit and a random data output circuit. The phase difference detection circuit detects a phase difference between a first clock signal and a second clock signal and outputs phase difference information. The random data output circuit is coupled to the phase difference detection circuit and outputs random data according to the phase difference information. Thereby, ideal and unpredictable random data is generated.

Abstract: An exemplary embodiment of the disclosure provides a random data generation circuit which includes a phase difference detection circuit and a random data output circuit. The phase difference detection circuit detects a phase difference between a first clock signal and a second clock signal and outputs phase difference information. The random data output circuit is coupled to the phase difference detection circuit and outputs random data according to the phase difference information. Thereby, ideal and unpredictable random data is generated.