Abstract: A preparation method of a low-power consumption mid-infrared quantum cascade laser. The method includes: providing, an epitaxial wafer, wherein the epitaxial wafer includes an initial lower waveguide layer, an active layer and an initial upper waveguide layer stacked in sequence; performing, a patterning process on a partial thickness of the epitaxial wafer to form a substrate and an initial ridge structure on the substrate, the initial ridge structure having a groove on a side surface thereof, and the initial ridge structure including a lower waveguide layer, an initial active region and an upper waveguide layer stacked in sequence in a direction away from the substrate; and performing transverse etching on the initial active region through the groove to remove a partial width of the initial active region, a remaining initial active region serving as an active region.

Abstract: A method and device for preventing rib spalling in a high-stress surrounding rock by hydraulic slotting are provided. The construction steps include: obtaining mechanical parameters of a surrounding rock and determine a width of each of pressure relief grooves; opening four drilling holes along an excavation direction of a roadway, and the four drilling holes are arranged at two sides of the roadway in pairs, and two of the drilling holes, located at the same side, are arranged at a bottom and a top of the roadway respectively; hydraulically slotting the drilling holes towards the roadway in a horizontal direction to form the pressure relief grooves; and excavating the surrounding rock to form the roadway, and the roadway is in communication with the pressure relief grooves.

Abstract: A method and device for preventing rib spalling in a high-stress surrounding rock by hydraulic slotting are provided. The construction steps include: obtaining mechanical parameters of a surrounding rock and determine a width of each of pressure relief grooves; opening four drilling holes along an excavation direction of a roadway, and the four drilling holes are arranged at two sides of the roadway in pairs, and two of the drilling holes, located at the same side, are arranged at a bottom and a top of the roadway respectively; hydraulically slotting the drilling holes towards the roadway in a horizontal direction to form the pressure relief grooves; and excavating the surrounding rock to form the roadway, and the roadway is in communication with the pressure relief grooves.

Abstract: A sealing structure of an underground high-pressure gas storage and a construction method thereof are provided. The sealing structure includes an annular lining structure, wherein the annular lining structure is surrounded by a plurality of concrete segments; closed steel sheets; the closed steel sheets are arranged at an inner side of the annular lining structure and used for connecting two adjacent concrete segments and plugging a gap between two adjacent concrete segments; and a sealing layer, wherein the sealing layer is arranged close to the inner side of the annular lining structure and forms a coating with the annular lining structure on the closed steel sheets.

Abstract: The application discloses a system and method for centrifugal intrusion of molten metal into porous media and then solidification positioning, including: test cups, used for placing test medium and molten metal intrusion; a rotor block, used for mounting the test cups, where one end of each test cup for placing the test medium is far away from the rotor block; a constant temperature oil bath preheating device, used for preheating the test cups and the rotor block; a centrifugal device, internally provided with the rotor block, used for performing a centrifugal operation on the test cups, where the test cups and the rotor block are installed inside the centrifugal device after being preheated; and an infrared heating and compression refrigerating device, arranged inside the centrifugal device, used for controlling a temperature of the test cups.

Abstract: Disclosed is a control method of a damper of a variable-air-volume air distributor and a control system thereof, mainly comprising a volume adjusting valve for the variable-air-volume air distributor, a valve actuator, a BP neural network-based main controller, a data collector and a user operation panel. The control method thereof is to use, mainly based on the collected room temperature and static pressure at the inlet of the air distributor, the BP neural network predictive model to establish a nonlinear model of temperature & static pressure and valve opening, perform training and optimization, and optimize the output valve opening to obtain and label an optimal value as the set value of the controller to control the action of the valve actuator, thereby realizing an automatic variable air volume.

Abstract: Implementations in the application provide wearable devices. In an implementation, a wearable device includes a housing, a printed circuit board (PCB), a feeding unit, and a switch. The housing includes a metal portion configured as an antenna radiator. The PCB is disposed in the housing and disposed opposite to the metal portion. The feeding unit is electrically connected to a first end of the metal portion and feeds the antenna radiator. One end of the switch is electrically connected to a second end of the metal portion, and the other end of the switch is grounded. The switch has a first switch state or a second switch state, and an operating frequency band of the antenna radiator includes a first frequency band.

Abstract: The present disclosure provides a cemented filling material with bionic structure, a preparation method and an application thereof, and belongs to the field of structural modification methods of cemented filling materials and research and development of civil materials with ultra-high energy absorption characteristics. The cemented filling material with bionic structure includes a bionic honeycomb skeleton and cemented filling slurry, where the cemented filling slurry is poured in the bionic honeycomb skeleton.

Abstract: A method and a system for simulating contact and interaction between a support member and a chamber surrounding rock mass are provided in the application.

Abstract: A method and a system for simulating contact and interaction between a support member and a chamber surrounding rock mass are provided in the application.

Abstract: The invention relates to new uses of lithium ions, in particular, to an application of a lithium ion composition in products for treating hyperuricemia, gout, hypertension and hyperglycemia. Through follow-up clinical trials, it is proved that the lithium ions with a concentration of 0.07 mg/L˜4.99 mg/L can effectively relieve and treat hyperuricemia, gout, hypertension and hyperglycemia.

Abstract: The present disclosure discloses a device and a method for continuously producing catalysts based on low-temperature coprecipitation. The device mainly includes: a metal salt preparation kettle, a primary reaction kettle, a secondary reaction kettle, a precipitant preparation kettle, a circulating refrigeration system, an automatic control system, a non-aqueous solvent storage tank and a water storage tank. Independent preparation kettles are provided for rapid dissolution of the raw materials, and can be used to prepare the raw materials for the next batch during the reactions that are carried out in the primary and secondary reaction kettles; the circulating refrigeration system refrigerates the primary and secondary reaction kettles, and thus during the reaction, the low-temperature precipitant makes it possible to offset the precipitation reaction heat and the heat caused by the stirring in the primary reaction kettle, and improve the refrigeration efficiency of the primary reaction kettle.

Abstract: Disclosed is a control method of a damper of a variable-air-volume air distributor and a control system thereof, mainly comprising a volume adjusting valve for the variable-air-volume air distributor, a valve actuator, a BP neural network-based main controller, a data collector and a user operation panel. The control method thereof is to use, mainly based on the collected room temperature and static pressure at the inlet of the air distributor, the BP neural network predictive model to establish a nonlinear model of temperature & static pressure and valve opening, perform training and optimization, and optimize the output valve opening to obtain and label an optimal value as the set value of the controller to control the action of the valve actuator, thereby realizing an automatic variable air volume.

Abstract: According to embodiments of the present invention, an optical modulator is provided. The optical modulator includes a substrate, and a waveguiding arrangement on the substrate, the waveguiding arrangement having a waveguide, and at least one graphene layer arranged to interact with light propagating in the waveguiding arrangement, wherein the waveguide is designed such that the light interacting with the at least one graphene layer has a maximum intensity overlapping with the at least one graphene layer. According to further embodiments of the present invention, a method for forming the optical modulator, and a method for controlling the optical modulator are also provided.

Abstract: The present disclosure discloses a multi-functional intelligent tunneling apparatus and method for simulating partial excavation of tunnel. The apparatus comprises an operating platform, a multi-functional rotary tunneling system, a precision power propulsion system, an information acquiring and processing system, a digital display control box and a slurry pumping device, wherein, the multi-functional rotary tunneling system includes a plurality of independent operating channels, and can realize multi-functional simulation of a tunnel construction process, including drilling, slurry injecting, and partial excavation under real-time monitoring; under the control of the digital display control box, the precision power propulsion system can realize the fine control of the multi-functional rotary tunneling system by means of hydraulic monitoring and preset advance distance.

Abstract: The present disclosure discloses a multi-functional intelligent tunneling apparatus and method for simulating partial excavation of tunnel. The apparatus comprises an operating platform, a multi-functional rotary tunneling system, a precision power propulsion system, an information acquiring and processing system, a digital display control box and a slurry pumping device, wherein, the multi-functional rotary tunneling system includes a plurality of independent operating channels, and can realize multi-functional simulation of a tunnel construction process, including drilling, slurry injecting, and partial excavation under real-time monitoring; under the control of the digital display control box, the precision power propulsion system can realize the fine control of the multi-functional rotary tunneling system by means of hydraulic monitoring and preset advance distance.

Abstract: The present disclosure discloses a device and a method for continuously producing catalysts based on low-temperature coprecipitation. The device mainly includes: a metal salt preparation kettle, a primary reaction kettle, a secondary reaction kettle, a precipitant preparation kettle, a circulating refrigeration system, an automatic control system, a non-aqueous solvent storage tank and a water storage tank. Independent preparation kettles are provided for rapid dissolution of the raw materials, and can be used to prepare the raw materials for the next batch during the reactions that are carried out in the primary and secondary reaction kettles; the circulating refrigeration system refrigerates the primary and secondary reaction kettles, and thus during the reaction, the low-temperature precipitant makes it possible to offset the precipitation reaction heat and the heat caused by the stirring in the primary reaction kettle, and improve the refrigeration efficiency of the primary reaction kettle.

Abstract: An operation mode switching method and user equipment are disclosed, so that an operation mode of the user equipment can be automatically switched. A specific solution is: determining, by user equipment, that a current data transmission rate of the user equipment is less than a first rate threshold, and/or a battery temperature of the user equipment is greater than a first temperature threshold; determining, by the user equipment, that the user equipment is in a CA operation mode; changing, by the user equipment, a transmission mode parameter of the user equipment to a transmission mode parameter corresponding to a non-CA operation mode; and restarting, by the user equipment, a communications module of the user equipment, and sending a first access request to a base station, where the first access request carries the transmission mode parameter corresponding to the non-CA operation mode.

Abstract: The present disclosure belongs to the technical field of solid oxide fuel cell stacks, and particularly relates to a method for preparing a connector-free anode-supported solid oxide fuel cell stack by means of 3D printing. The method includes taking a mixed paste of an anode ceramic powder and a photosensitive resin as a raw material, and preparing a three-dimensional channel honeycomb-type anode-supported matrix by means of 3D printing; and obtaining an anode-supported solid oxide fuel cell by means of an impregnation method, effectively bringing same into contact, and abutting and sealing same in the order of a cathode, an anode and a cathode, and forming the connector-free anode-supported solid oxide fuel cell stack after performing connection in series.