Abstract: The application provides a floor tile screen, comprising a box body (1), a rear body (2), a PCB board (3) and a front body (4), wherein the rear body (2) is fixed on the box body (1); the PCB (3) is arranged between the rear body (2) and the front body (4), and provided with lamp beads; a plurality of transparent fixing columns (41) are fixedly arranged on the front body (4), pass through the PCB board (3), fixedly connected with the rear body (2), and avoid the lamp beads. The fixing column (41) has the function of limiting the front body (4), the front body (4) and the rear body (2) are connected together by fixing columns (41), to avoid separation; the fixing columns (41) are transparent, so that the light emitted by the lamp beads is not blocked, the display effect of the floor tile screen is improved.

Abstract: Provided is an LED display unit, comprising a front body, a lamp plate and a rear body, wherein the lamp plate is bendable and flexible, and the rear body comprises a plurality of rear body units, the front body is covered on one side of the lamp plate provided with LED lamps, each rear body unit is fixedly connected to a side of the lamp plate facing away from the LED lamps, and adjacent rear body units are arranged at intervals; by adopting the bendable and flexible lamp plate, every single LED display unit can be directly adjusted into a curved surface or any curved surface shape; a plurality of rear body units are fixed on the lamp plate, and gaps exist between the rear body units, which is beneficial to releasing bending stress and preventing the rear body from breaking during bending.

Abstract: Provided is a LED display box transport cart comprising: a transport frame and wheels, the transport frame comprises a chassis, an upper cover and two side covers symmetrically arranged between chassis and upper cover; chassis is provided with an arcuate groove with an upward opening, the first edge of arcuate groove extends to second edge to form a groove edge; the lower end of side cover corresponding to the position of arcuate groove is provided with a hook, circular arc plate of hook is rotatably connected in arcuate groove, the lower edge of rectangular plate is fixedly connected on second straight edge of circular arc plate, the arcuate edge is in sliding contact with inner wall of groove body of arcuate groove, the first straight edge of circular arc plate can abut against lower surface of groove edge; the upper end of side cover is detachably connected with upper cover.

Abstract: Provided is an LED display screen, comprising an LED display unit, a box frame arranged at two outer ends of the unit, a power control box fixedly connected to the unit and a curved surface adjustment device. The unit includes a front body, a rear body, a bendable flexible lamp panel and an elastic stop piece; The front body covers one side of the lamp panel provided with LED lamps, and the rear body includes a plurality of rear body units, each is fixedly connected to one side of the lamp panel facing away from the LED lamps, and adjacent rear body units are arranged at intervals; The elastic stop piece is positioned between the lamp panel and rear body; one end of the curved surface adjustment device is fixedly connected to the box frame and another end is fixedly connected to the power control box.

Abstract: Provided is a LED display box transport cart comprising: a transport frame and wheels, the transport frame comprises a chassis, an upper cover and two side covers symmetrically arranged between chassis and upper cover; chassis is provided with an arcuate groove with an upward opening, the first edge of arcuate groove extends to second edge to form a groove edge; the lower end of side cover corresponding to the position of arcuate groove is provided with a hook, circular arc plate of hook is rotatably connected in arcuate groove, the lower edge of rectangular plate is fixedly connected on second straight edge of circular arc plate, the arcuate edge is in sliding contact with inner wall of groove body of arcuate groove, the first straight edge of circular arc plate can abut against lower surface of groove edge; the upper end of side cover is detachably connected with upper cover.

Abstract: Provided is an anti-impact LED display screen, comprising a box body (1), a module (2), a protective mechanism (3), a first resilient assembly (4), a second resilient assembly (5) and a limit member (6). The protective mechanism (3) comprises a movable base (31) and a corner armor (32).

Abstract: Provided is a curved surface adjustment device comprising an angle rotating assembly and a locking assembly, wherein the angle rotating assembly comprises a middle plate and a housing, the housing comprises a first mounting portion and a receptacle, the middle plate comprises a second mounting portion and an arc-shaped sliding portion; the locking assembly comprises a locking mechanism, when the locking mechanism is in a locking state, the arc-shaped sliding portion is locked in the arc-shaped sliding groove of the receptacle, when in an unlocking state, the arc-shaped sliding portion slides relative to the arc-shaped sliding groove of the receptacle, to adjust the included angle between the first mounting portion and the second mounting portion, thereby adjusting the curved surface radian of the LED display screen. The LED display screen adjusted by the present invention has better curved surface smoothness and smaller curved surface radius, provides more excellent display effect.

Abstract: Provided is an anti-impact LED display screen, comprising a box body (1), a module (2), a protective mechanism (3), a first resilient assembly (4), a second resilient assembly (5) and a limit member (6). The protective mechanism (3) comprises a movable base (31) and a corner armor (32).

Abstract: A pin-type connection apparatus includes a first connecting seat, a second connecting seat, a connecting shaft, and a locking component, wherein a receiving hole and a locking hole on the adjacent side of the receiving hole are disposed on the second connecting seat, one end of the connecting shaft is fastened to the first connecting seat, a clamping hole is disposed at the other end of the connecting shaft, the connecting shaft can extend into the receiving hole, a first clamping protrusion is disposed in the clamping hole, a second clamping protrusion is disposed at one end of the locking component, and the locking component can pass through the locking hole and extend into the clamping hole; and when the locking component is rotated to a lockout position, the first clamping protrusion can abut against the second clamping protrusion and restrain the second clamping protrusion from exiting the clamping hole.

Abstract: Provided is an LED display unit, comprising a front body, a lamp plate and a rear body, wherein the lamp plate is bendable and flexible, and the rear body comprises a plurality of rear body units, the front body is covered on one side of the lamp plate provided with LED lamps, each rear body unit is fixedly connected to a side of the lamp plate facing away from the LED lamps, and adjacent rear body units are arranged at intervals; by adopting the bendable and flexible lamp plate, every single LED display unit can be directly adjusted into a curved surface or any curved surface shape; a plurality of rear body units are fixed on the lamp plate, and gaps exist between the rear body units, which is beneficial to releasing bending stress and preventing the rear body from breaking during bending.

Abstract: Provided is a sealing ring, including a ring body, wherein the ring body includes a ring groove, a first convex ring is provided on each of the upper and lower surfaces of the bottom wall of the ring groove, and the first convex ring is a closed ring with the same extension direction as the ring groove. The side wall of the ring groove reduces the impact force of water, pressure between the first convex ring and sealed body is increased, and the sealing performance of the first convex ring is improved. Further provided is An LED display screen, including a module, box, power box and a plurality of sealing rings, wherein a first sealing ring is disposed between the power box and box, a second sealing ring is disposed between the box and module; the two rings have good sealing performance, which improves sealing performance of the LED screen.

Abstract: The present invention discloses a method for preparing a GaN rectifier suitable for operating at an alternating current frequency of 35 GHz: sequentially growing, on a silicon substrate, an N-polar GaN buffer layer, a carbon doped semi-insulated N-polar GaN layer, a non-doped N-polar AlGaN layer, a non-doped N-polar GaN layer and a non-doped N-polar InGaN thin film to obtain a rectifier epitaxial wafer; preparing a pattern groove for a schottky contact electrode on the GaN rectifier epitaxial wafer, and depositing the schottky contact electrode in the groove; preparing a pattern for an ohmic contact electrode, and depositing a device ohmic contact electrode on the surface of the epitaxial wafer; subsequently, depositing a silicon nitride passivation layer at a part where there is no electrode on the surface of the epitaxial wafer, and preparing a surface electrode area; and finally, performing mesa isolation treatment on the GaN rectifier epitaxial wafer.

Abstract: The present disclosure provides for shape memory proppants, methods for making shape memory proppants, and methods of using shape memory proppants, and the like. The strong expandable proppants of the present disclosure may be used in maintaining fracture openings.

Abstract: A UV-curable and recyclable thermoset shape memory polymer is provided. The polymer includes a vitrimer-based monomer and a photoinitiator. The vitrimer-based monomer includes a first unit rendering a high chain stiffness upon polymerization of the monomer, and a second photopolymerizable unit for photopolymerization of the monomer under a UV irradiation. The polymer has high strength, high stiffness, high recovery stress, high energy storage, reasonable recycling efficiency, and is printable using SLA with high resolution.

Abstract: The low temperature cracking and high temperature rutting of polymer-modified asphalt concrete pavement can be reduced. The composite includes asphalt and at least one polymer that expands at low temperature, triggered by cooling-induced tensile stress, to reduce thermal cracking. The composite includes at least one polymer that expands at high temperature, so that the composite recovers after compression induced by traffic loading at higher temperatures, thereby reducing rutting. The system reduces thermal stress, and reduces or even eliminates thermal cracking and rutting. Shape memory polymers (SMPs) are used to improve asphalt compositions so that they better resist both thermal cracking and rutting. The SMP(s) can be incorporated into the asphalt, or a portion of fine aggregates can be replaced with SMP particles or SMP fibers, or aggregate replacement and asphalt modification can be combined.

Abstract: Methods for temporary fracture isolation are provided. An existing fracture is treated with a chemical diverter. The chemical diverter is exposed to conditions causing it to expand, plugging the fracture. A new fracture can be created through the application of pressure and fluid, without disrupting the plugged fracture. The chemical diverter can then be removed through biodegradation or the application of a solvent to reopen the first fracture.

Abstract: Provided is an LED Screen, comprising a box frame and a display unit fixed in the box frame, wherein the display unit comprises a PCB board and a plurality of LED lamp beads fixed on the PCB board, the front and back of the display unit are covered with transparent waterproof membranes, which can play a waterproof role and avoid short circuit of the display unit; Waterproof membranes can also play a role in protecting the LED lamp beads and PCB board, preventing external objects from damaging the beads, and the PCB board from being corroded. Transparent waterproof membrane is easier for the light emitted from LED Lamp beads to pass through, so the PCB board installed with LED lamp beads and covered with waterproof membranes can be directly fixed on the box frame, and can be used, the PCB board can be directly maintained, which is simple and convenient.

Abstract: A sealant composition and method for its manufacture are disclosed. A two-way shape memory polymer (2W-SMP) sealant expands upon cooling and contracts upon heating, and thus provides improved sealing for pavements and other structures. The base resin for the sealant is polybutadiene with a high cis content. Uses for the sealant include, but are not limited to: sealant for expansion joint, contraction joint, or construction joint in cement concrete pavement; sealant or sealer for transverse cracks or block cracks in cement concrete pavement or asphalt concrete pavement; sealant for pipelines, lightweight composite structures, roofs, buildings, bridge decks, dams, offshore platforms; sealant for other structures and devices that have previously typically used polymer sealants.

Abstract: A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOx exceedance is observed and clearing a urea quality error in response to the NOx exceedance not being observed.

Abstract: A hybrid core comprising a matrix and tubular structural reinforcements, such as a ductile matrix core reinforced with ductile hollow tubes, as well as panels which comprise such hybrid core. Embodiments of the invention manifest resistance to both interfacial debonding and ballistic penetration.