Abstract: The invention discloses an effusion cell with a retractable crucible for molecular beam epitaxy, comprising a crucible bracket, a mounting flange, a heat shielding cylinderarranged on an upper side of the mounting flange, a gate valvearranged on a lower side of the mounting flange, an outer cylinderarranged on a lower side of the gate valveand a driving devicefor driving the crucible bracketto move between the heat shielding cylinderand the outer cylinder, the heat shielding cylinderis internally provided with a heater, the outer cylinder driving deviceis hermetically connected to the outer cylinder.

Abstract: The present disclosure provides a display substrate and a manufacturing method thereof, and a display apparatus. The display substrate has a fingerprint identification region. The display substrate includes a base substrate; a display unit on the base substrate and including a display thin film transistor and a light-emitting device, a second electrode of the display thin film transistor being coupled to a first electrode of the light-emitting device; and a fingerprint identification unit at a gap between adjacent display units in the fingerprint identification region and including a fingerprint identification transistor and a photosensitive device, a first electrode of the fingerprint identification transistor being coupled to a second electrode of the photosensitive device. The display substrate further includes a gate insulating layer on a side of an active layer of the display thin film transistor and an active layer of the fingerprint identification transistor distal to the base substrate.

Abstract: The present invention provides a refrigerator door with a replaceable door panel, comprising: a door body and a decorative door panel detachably connected to the door body; a rotary latch and a limiting member are disposed on the door body; a rear side of the decorative door panel facing towards the door body comprises a second limiting member and a lock post wherein when the decorative door panel is assembled on a front side of the door body, the rotary latch and the lock post snap-fit each other to limit a displacement of the decorative door panel in an up-down direction; the first limiting member cooperates with the second limiting member to limit a displacement of the decorative door panel in a front-rear direction.

Abstract: A chip type coil-based fluxgate current sensor, comprising: a magnetism gathering iron core, a chip type coil, an integral filtering module, a signal driving module, a voltage acquisition module, and a signal amplification module which are connected in sequence. The chip type coil comprises a first high-resistance silicon wafer and a second high-resistance silicon wafer which are bonded with each other; a built-in cavity is formed between involution surfaces of first high-resistance silicon wafer and second high-resistance silicon wafer, and multiple solenoid cavities filled with coil materials are provided around the periphery of the cavity; a cavity opening is formed at one end after involution of first high-resistance silicon wafer and second high-resistance silicon wafer. The magnetism gathering iron core is inserted into the cavity of the chip type coil by means of the cavity opening. The present current sensor is small in size and stable in signal.

Abstract: The present invention provides a vacuum storage device and a refrigerator. The vacuum storage device comprises a housing, a cover, an evacuation assembly, a pressure relief assembly and an adjusting assembly; the pressure relief assembly comprises a pressure relief hole, a sealing plug covering the pressure relief hole in a natural state, and a pressure relief element having a pressure relief slider; the adjusting assembly drives the pressure relief slider to get close to or away from the sealing plug without being affected by an external force. The structure is simple and the sealing effect is better.

Abstract: A refrigerator, comprising a refrigerator body defining a first chamber and a door body. The door body comprises a main door for opening/closing the first chamber, and defining a second chamber, and a secondary door for opening/closing the second chamber. An air supply port for introducing air in the first chamber into the second chamber, and an air return port for returning air in the second chamber to the first chamber are provided on a rear wall of the main door. The second chamber is provided with a dry storage portion. The rear wall of the main door comprises a front shell and a rear shell with an air duct defined therebetween. The air duct introduces cold air prepared in the refrigerator, so that the cold air is condensed on an inner wall of the air duct, becomes dry gas, and then flows into the dry storage portion.

Abstract: Provided in the present disclosure are a bifunctional protein which can bind to PD-1 (programmed death receptor-1) and TGF-? (transforming growth factor-?), the medical use of the bifunctional protein, and a preparation method therefor.

Abstract: A fracturing and power generation switchable apparatus, a well site, a control method of the well site, a control device, and a storage medium are provided. The fracturing and power generation switchable apparatus includes a power device, a speed transmission device, and a bearing base. The switchable apparatus is configured to switch between a first state and a second state, under the first state, the plunger pump is fixed on the bearing base and is connected with the speed transmission device, and the switchable apparatus is supplied as a fracturing apparatus, and under the second state, the electric generator is fixed on the bearing base and is connected with the speed transmission device, and the switchable apparatus is supplied as a power generation apparatus.

Abstract: A manufacturing method for a fluxgate chip, comprising: firstly, selecting two high-resistance silicon wafers, electroplating a ferromagnetic core on the surface of one of the two high-resistance silicon wafers, and providing a ferromagnetic core cavity on the surface of the other high-resistance silicon wafer; then, bonding the two high-resistance silicon wafers up and down; next, respectively providing coil grooves, through grooves and electrode windows on the surfaces of opposite sides of the two high-resistance silicon wafers to form a silicon wafer mold; and finally, filling the surface of the silicon wafer mold with alloy. By means of electroplating, post-bonding and final etching, on the one hand, the formed fluxgate chip has both small thickness and sufficient strength, on the other hand, large-scale batch production of the fluxgate chip can be achieved, the working efficiency is improved, and the production cost is reduced.

Abstract: The present invention discloses a hydraulic fracturing system for driving a plunger pump with a turbine engine, including a fracturing equipment comprising a turbine engine fueled by natural gas or diesel as a power source, an exhaust system, and a plunger pump; a high-low pressure manifold; a blending equipment adapted to blend a fracturing base fluid; and a sand-mixing equipment adapted to provide the fracturing base fluid and a fracturing proppant to the high-low pressure manifold. A first end of the high-low pressure manifold is connected to the fracturing equipment through a connection pipeline. A second end of the high-low pressure manifold is connected to a wellhead. An exhaust end of the turbine engine is connected to the exhaust system whereas an output driving end of the turbine engine is connected to the plunger pump via a connection device. The connection device comprises at least a reduction gearbox.

Abstract: A fracturing device, including a power unit, wherein the power unit comprises a muffling compartment, a turbine engine, an air intake unit, and a starter; the air intake unit is communicated with the turbine engine through an intake pipe, and configured to provide a combustion-supporting gas to the turbine engine; the air intake unit is located at the top of the muffling compartment, the muffling compartment comprises an accommodation space, the turbine engine and the starter are located in the accommodation space, and the starter is configured to start the turbine engine, the starter comprises a first electric motor.

Abstract: The present invention provides a refrigerator door body, provided with a door liner and a storage device mounted on the door liner; a hanging lug and a fitting groove which fit each other are provided between the door liner and the storage device, a power supply module is provided, in a fitting manner, between the hanging lug and the fitting groove, the power supply module comprises a first connector provided on the hanging lug and a second connector provided at the fitting groove, and the first connector and the second connector are connected to each other in a fitting manner when the storage device is mounted. The refrigerator door body of the present invention not only can function to support the storage device, but also can function to supply power to the storage device.

Abstract: A method for preparing a rare earth aluminum alloy powder applicable for additive manufacturing includes: heating and melting aluminum ingots into an aluminum melt; adding required alloy elements to the aluminum melt to obtain an alloy melt in which the alloy elements are present in the following preset percentages by weight: 1.00% to 10.00% of Ce, 0.05% to 8.00% of Mg, 0.10% to 7.50% of Y, 0.10% to 2.50% of Zr, less than 0.1% of impurities, and the balance aluminum; leading out the alloy melt through a fluid guiding pipe, and impacting the alloy melt with a high-pressure gas flow so that the alloy melt is atomized into fine droplets under an action of surface tension, and solidified into spherical alloy powder; and collecting the spherical alloy powder in a vacuum collector, and screening and drying the spherical alloy powder to obtain the rare earth aluminum alloy powder.

Abstract: A fracturing device includes a power unit, and the power unit includes a muffling compartment, a turbine engine, and an air intake unit. The air intake unit is communicated with the turbine engine through an intake pipe and configured to provide a combustion-supporting gas to the turbine engine; the air intake unit is at a top of the muffling compartment and the muffling compartment has an accommodation space, the turbine engine is within the accommodation space.

Abstract: The present invention provides a quinoline derivative for treating triple-negative breast cancer and use thereof in preparing a pharmaceutical composition for treating a tumor.

Abstract: A device (100) for monitoring a delivery process of a package. The device (100) includes: at least one sensor (110) configured to obtain condition data associated with the package during the delivery process; a communication interface (120); and a processor (130) configured to receive the condition data from the at least one sensor (110) and to transmit a report based on the condition data to a server (400, 500) via the communication interface (120).

Abstract: A head-mounted device may include one or more adjustable lens elements. The adjustable lens element may include a transparent substrate, a collapsible wall that forms an enclosed perimeter on the transparent substrate, and a flexible membrane on the collapsible wall that together define an interior volume. The interior volume may be filled with a fluid. The adjustable lens element may include a lens shaping component that applies a force to the collapsible wall to adjust a height of the collapsible wall relative to the transparent substrate, which in turn may be used to adjust the shape of the flexible membrane and thus the lens power of the lens element. The collapsible wall may have bellows that allow the collapsible wall to fold on itself when compressed, thereby minimizing unintended lateral movement of the collapsible wall.

Abstract: A method for communications is proposed. The method may comprise obtaining, by a terminal device, network addresses of another terminal device from a message broker to which the terminal device and the another terminal device are registered. At least one of the terminal device and the another terminal device is connected to a cellular network. The method may further comprise initiating a connectivity check procedure to determine one or more candidate paths through which the terminal device has connectivity to the another terminal device. The one or more candidate paths are from at least two paths associated with the network addresses of the another terminal device. The method may further comprise selecting a path for the terminal device and the another terminal device among the one or more candidate paths, based at least in part on a predefined criterion.

Abstract: A lens module in a head-mounted device may include a fluid-filled chamber, a semi-rigid lens element that at least partially defines the fluid-filled chamber, and at least one actuator configured to selectively bend the semi-rigid lens element. The semi-rigid lens element may become rigid along a first axis when the lens element is curved along a second axis perpendicular to the first axis. Six actuators that are evenly distributed around the periphery of the semi-rigid lens element may be used to control the curvature of the semi-rigid lens element. The semi-rigid lens element may initially be planar or non-planar. For example, the semi-rigid lens element may initially have a spherically convex surface and a spherically concave surface. A tunable spherical lens may be incorporated into the lens module to offset a parasitic spherical lens power from the semi-rigid lens element.

Abstract: The present invention provides a quinoline derivative for treating triple-negative breast cancer and use thereof in preparing a pharmaceutical composition for treating a tumor.