Abstract: The application provides a modification of gas density relay, a gas density relay with online self-check function and its check method for high-voltage and medium-voltage electrical equipment. The gas density relay includes a gas density relay body, a gas density sensor, a pressure regulating mechanism, a valve, an online check contact signal sampling unit and an intelligent control unit. The pressure is increased or decreased by the pressure regulating mechanism to enable the contact action of the gas density relay body. The contact action is transmitted to the intelligent control unit through the online check contact signal sampling unit. The intelligent control unit detects the alarm and/or blocking contact signal operating value and/or return value of the gas density relay body according to the density value of the contact action; the check of the gas density relay can be completed without maintenance personnel on site.

Abstract: The present disclosure provides a method of designing and manufacturing a hydraulic valve block based on selective laser melting. The method includes providing a machined hydraulic valve block, determining whether the machined hydraulic valve block needs weight reduction, if the machined hydraulic valve block needs weight reduction, taking reduction of the pressure loss of the flow channel as an optimization goal and optimizing the flow channel of the machined hydraulic valve block to obtain an optimized flow channel structure model, taking reduction of the weight of the hydraulic valve block as an optimization goal and optimizing solid portions of the optimized flow channel structure model by using a topology optimization method to obtain a three-dimensional solid structure model of a hydraulic valve block and printing the three-dimensional solid structure model by using selective laser melting to obtain the hydraulic valve block.

Abstract: A high anti-vibration gas density monitor is provided, including a monitor enclosure, a signal control mechanism, and an indication value display mechanism independent from the signal control mechanism which are provided in the monitor enclosure. The signal control mechanism includes at least one corrugated pipe, a sealed compensation chamber, a signal generator, and a signal regulation mechanism. The corrugated pipe is perpendicular to a side wall of a control casing. The monitor enclosure includes an independent sealed compartment used to mount the indication value display mechanism. The sealed compartment is filled with anti-vibration oil, or is hermetically filled with gas. The indication value display mechanism includes a Bourdon tube, a base, an end holder, a movement, a pointer, and a dial.

Abstract: The present disclosure provides a method of designing and manufacturing a hydraulic valve block based on selective laser melting. The method includes providing a machined hydraulic valve block, determining whether the machined hydraulic valve block needs weight reduction, if the machined hydraulic valve block needs weight reduction, taking reduction of the pressure loss of the flow channel as an optimization goal and optimizing the flow channel of the machined hydraulic valve block to obtain an optimized flow channel structure model, taking reduction of the weight of the hydraulic valve block as an optimization goal and optimizing solid portions of the optimized flow channel structure model by using a topology optimization method to obtain a three-dimensional solid structure model of a hydraulic valve block and printing the three-dimensional solid structure model by using selective laser melting to obtain the hydraulic valve block.

Abstract: A device for realizing the splicing of an array fiber and a large-size quartz end cap comprises a carbon dioxide laser, a light splitter, a light beam shaper, a high reflectivity mirror, an image detection module, an array fiber and a carrier thereof, a large-size quartz end cap and a carrier thereof, a stepping motor, a thermodetector, and a computer; a laser beam emitted by the carbon dioxide laser is divided into two light beams through a light splitter, after the two light beams respectively pass through the beam shaper and the high reflectivity mirror, two strip-shaped light spots with uniform power density are integrally formed to heat a splicing face of the large-size quartz end cap, a uniform temperature field of a target splicing area is achieved through indirect heating and heat conduction.

Abstract: The present disclosure provides a method and system of casting an integral multi-way valve based on 3D printing, and belongs to the technical field of valve casting. The casting method and system determine, according to structural parameters of an integral multi-way valve to be cast, a plurality of ingates on a plurality of layers, a plurality of runners connecting the ingates on each layer, and a sprue connecting the plurality of runners, and an integral sand mold is printed by using the 3D printing technology to realize a multi-layer composite casting method and a corresponding casting system.

Abstract: A process of strengthening 3D printed sand core for the casting of integral hydraulic multi-way valve and a sand core for integral hydraulic multi-way valve are provided. The process includes: creating a sand core model of a sand core for an integral hydraulic multi-way valve in three-dimensional software, analyzing parts of the sand core to determine a weak part of the sand core; designing a pore channel with a pore diameter and a length in the sand core model according to a ratio L/D of a length to a diameter of the weak part, and forming a reinforcing core bar according to the pore channel; and 3D printing the sand core according to the sand core model, placing the reinforcing core bar in the pore channel, and achieving tight connection of the reinforcing core bar and the sand core in the hardening or curing process of the sand core.

Abstract: The present invention discloses a Fire-fighting water cannon comprising: a first motor assembly including a first housing, a first stator assembly, a first rotor assembly and a central shaft; both ends of the first housing are respectively provided with a first end cover and a second end cover, the first end of the first stator assembly is connected with the second end cover, the first rotor assembly is sleeved on the outside of the first stator assembly, and the first rotor assembly is rotatably connected with the first housing; the cannon head assembly including a first cannon head and a second cannon head, the first cannon head is connected with the first stator assembly, the second cannon head is sleeved on the outside of the first cannon head, and the second cannon head is threadedly connected with the first rotor assembly, the first cannon head is provided with a first anti-rotation device; the cannon core assembly is arranged on the central axis and cooperates with the cannon head assembly.

Abstract: An anti-collision simulation device and a radiotherapy system relate to the technical field of medical equipment. The anti-collision simulation device is applied to a radiotherapy device, and includes a supporting frame and a simulation rod rotatably connected to the supporting frame. A space enclosed by a rotation track of the simulation rod is matched with a space in a therapy cabin of the radiotherapy device. The supporting frame includes a fixing frame and a movable frame. The fixing frame is fixedly installed relative to the radiotherapy device. The simulation rod is rotatably connected to the movable frame, and the movable frame is able to move relative to the fixing frame, so as to enable the simulation rod to be located at different positions.

Abstract: The disclosure relates to a network activity indicator presentation method and system. The method includes: monitoring a setting state of a visible attribute of a network activity indicator, wherein the setting state of the visible attribute includes: setting to be a YES state and setting to be a NO state; calculating a count value of the network activity indicator according to the monitored setting state of the visible attribute; and acquiring the count value corresponding to the network activity indicator, and determining a presentation state of the network activity indicator, wherein the presentation state of the network activity indicator includes: a display state and a non-display state. The disclosure has the beneficial effects of simplifying programmed algorithms and saving system resources, the implementation process is brief, execution efficiency is high, and an occupation rate of the system resources is greatly reduced.

Abstract: A method for preparing a carbon-coated ternary positive electrode material has steps of preparing a ternary positive electrode material precursor, and preparing a suspension of the ternary positive electrode material precursor. Lithium acrylate is added to the suspension of the ternary positive electrode material precursor according to the molar ratio of Li:(Ni+Co+Mn) being 1.03-1.05:1. Ammonium persulphate is added to the lithium acrylate-containing suspension of the ternary positive electrode material precursor, so that the lithium acrylate undergoes a polymerisation reaction and a suspension of a lithium polyacrylate-coated ternary positive electrode material precursor is obtained. The suspension of the lithium polyacrylate-coated ternary positive electrode material precursor is dried to obtain spherical particles. The lithium polyacrylate-coated ternary positive electrode material precursor particles are sintered to obtain a carbon-coated ternary positive electrode material.

Abstract: A method and apparatus for position detection, and a radiotherapy system are provided. The radiotherapy system includes: a treatment couch, a positioning apparatus, an optical tracking system and a computer; the positioning apparatus disposed on the treatment couch, and at least one reference point provided on the positioning apparatus; the optical tracking system disposed above the treatment couch and configured to detect relative positioning between a mark point set on a treated part of a patient and the reference point, determine deviation between the relative and reference positions, and send the deviation to the computer. The computer is configured to determine whether to adjust a position of the treatment couch based on the deviation and deviation range. The system provided by the present disclosure avoids the influence of patient movement on the accuracy of treatment, and prevents a treatment beam from damaging normal tissues of the patient.

Abstract: The present disclosure relates to compositions comprising collagen 7 and methods of using the same to treat DEB.

Abstract: The present disclosure relates to compositions comprising collagen 7 and methods of using the same to treat DEB.

Abstract: A heat-dissipating device configured to cool the battery pack of an electric vehicle includes a coolant circulating pump and a tank. The coolant circulating pump is configured to engage with the one or more heat dissipation pipes of the electric vehicle and communicate with the one or more heat dissipation pipes. The tank is configured to contain coolant which includes phase change material. When cooling is required, for example during battery recharging, the coolant circulating pump is configured to inject the coolant in the tank into the one or more heat dissipation pipes via the coolant inlet, drive the coolant to flow in the one or more heat dissipation pipes, and take the coolant out from the one or more heat dissipation pipes via the coolant outlet to the exterior. A related electric vehicle and a related heat dissipation method are also provided.

Abstract: The present disclosure relates to compositions comprising collagen 7 and methods of using the same to treat DEB.

Abstract: A sodium ion battery electrode material is disclosed, the electrode material including a conductive porous material or a conductive porous composite. A sodium accommodating pore is defined inside the electrode material, effective pore diameter size for sodium ion storage in the sodium accommodating pore is in a range of 0.2-50 nm. A method for preparing the conductive porous composite and a sodium ion battery electrode are also provided.

Abstract: A method for preparing a carbon-coated ternary positive electrode material has steps of preparing a ternary positive electrode material precursor, and preparing a suspension of the ternary positive electrode material precursor. Lithium acrylate is added to the suspension of the ternary positive electrode material precursor according to the molar ratio of Li:(Ni+Co+Mn) being 1.03-1.05:1. Ammonium persulphate is added to the lithium acrylate-containing suspension of the ternary positive electrode material precursor, so that the lithium acrylate undergoes a polymerisation reaction and a suspension of a lithium polyacrylate-coated ternary positive electrode material precursor is obtained. The suspension of the lithium polyacrylate-coated ternary positive electrode material precursor is dried to obtain spherical particles. The lithium polyacrylate-coated ternary positive electrode material precursor particles are sintered to obtain a carbon-coated ternary positive electrode material.

Abstract: A heat management structure able to disperse heat but also able to retain a proper working heat includes a heat dissipation layer, a receiving member, and a heat pipe. The receiving member is configured to receive a heating member. Ends of the heat pipe are coupled to the heat dissipation layer and the receiving member. A related unmanned aerial vehicle is also provided.

Abstract: A dispenser has a body with a storage chamber for storing product. A one-way valve of the dispenser includes a valve seat and flexible valve cover seated on the valve seat and defining a normally-closed seam therebetween forming a fluid-tight seal between the valve cover and valve seat. The flexible valve cover is movable relative to the valve seat to allow the passage of substance through the seam and out of the dispenser.