Abstract: The present disclosure discloses a concrete block apparatus for ash slag after coal gasification. The present disclosure relates to the field of ash slag concrete processing technology after coal gasification. including an apparatus; the first connecting frame is installed on the outside of the apparatus; the chute is opened in the interior of the apparatus; the first chute board is connected to the inside of the chute; the moving mechanism is connected to the first connecting frame, the moving mechanism includes the second chute board and the third chute board, the external of the second chute board and the third chute board is provided with a moving frame, the second chute board and the third chute board are used to control the moving frame in and out of the apparatus, the placing mechanism is connected to the moving mechanism.

Abstract: A coal gasification slag all-solid waste cementitious material and a preparation method thereof belong to the field of comprehensive utilization of resources and mining technology, the coal gasification slag all-solid waste cementitious material and the preparation method thereof adopt coal gasification slag, granulated blast furnace slag, desulfurization ash, desulfurization gypsum, carbide slag, and other mine or industrial solid waste with low cost. After resource utilization, the problem of solid waste accumulation is effectively solved, and the pressure on the ecological environment is reduced. A process of calcination and activation of coal gasification slag without auxiliary fuel is proposed, the calcination temperature is 400-500 °C. The high content residual carbon in coal gasification slag is used to provide the heat value of calcination, reduce the external energy consumption, and enhance the combustion rate.

Abstract: The present disclosure belongs to the field of solid waste resource utilization and building materials technology, specifically relates to a copper molybdenum tailings based alkali activated cementitious material and preparation method. The copper molybdenum tailings based alkali activated cementitious material including: solid waste dry mixture, alkali activator solution, silicone acrylic lotion and modified nano-silica; where the solid waste dry mixture is composed of 50-70 parts of copper molybdenum tailings; 10-30 parts of auxiliary calcium material; 10-20 parts of silicon aluminum correction material. The method of the present disclosure can achieve a large-scale consumption of copper molybdenum tailings and prepare cementitious materials with excellent mechanical properties and good stability.

Abstract: The present disclosure pertains to a method for optimizing open-pit mine limits with simultaneous consideration of mining carbon emissions and slope safety, comprising the following steps: establishing a three-dimensional model of the mine; establishing a carbon emission calculation model for open-pit mining; determining rock indices and rock types of the mine; dividing the mining area into geological zones, determining an acceptable slope angle range for each zone, and forming slope angle combination schemes; calculating the final limit under each slope angle combination one by one; obtaining a sequence of three-dimensional geological models of the limits; calculating the slope instability probability for each zone; calculating the carbon emissions for each limit; dividing the limit results according to the acceptable slope instability probability indices, and directly calculating the benefit evaluation indices for results that meet the requirement; designing reinforcement schemes for results that do not mee

Abstract: The present disclosure relates to the technical field of boundary pillar failure induced by backfilling of open pits, and particularly to device and method for testing boundary pillar failure induced by tailings backfill in an open pit, comprising: a test assembly; a conveying assembly, connected to the test assembly and configured to uniformly feed tailing into the test assembly; a pressure control assembly, connected to the test assembly and configured to control pressure in the test assembly; and a monitoring assembly, disposed on the test assembly and configured to monitor data information within the test assembly when internal pressure of the test assembly is changed. The conveying assembly is configured to provide uniform distribution of tailings to the test assembly, the pressure control assembly is configured to simulate actual pressure conditions, and the monitoring assembly is configured to acquire data in real time.

Abstract: A structure self-adjusting type vehicle-mounted magnetic suspension flywheel battery coping with multiple operation modes and an operating method thereof are provided. An ant-nest type channel is formed in a radiator of the flywheel battery along a circumferential direction, and a plurality of counterweight magnetic adsorption devices are symmetrically embedded in a flywheel lower sphere. When the flywheel battery operates in a charging mode, a standby mode or a discharging mode, the operation mode of the motor is flexibly changed according to different recovered energy levels or output energy levels, and the loss in the magnetic bearing system is reduced through matching of different types of magnetic bearings according to different disturbance levels. The low-loss, high-safety and stable operation of the vehicle-mounted magnetic suspension flywheel battery in various operation modes can be realized.

Abstract: A structure self-adjusting type vehicle-mounted magnetic suspension flywheel battery coping with multiple operation modes and an operating method thereof are provided. An ant-nest type channel is formed in a radiator of the flywheel battery along a circumferential direction, and a plurality of counterweight magnetic adsorption devices are symmetrically embedded in a flywheel lower sphere. When the flywheel battery operates in a charging mode, a standby mode or a discharging mode, the operation mode of the motor is flexibly changed according to different recovered energy levels or output energy levels, and the loss in the magnetic bearing system is reduced through matching of different types of magnetic bearings according to different disturbance levels. The low-loss, high-safety and stable operation of the vehicle-mounted magnetic suspension flywheel battery in various operation modes can be realized.

Abstract: A method for a direct current (DC) islanding detection based on positive feedback of a bus voltage at a specific frequency, essentially including three steps: extraction of a specific frequency component of the bus voltage, injection of a disturbance component of the specific frequency, and determination of DC islanding. The extraction of the specific frequency component of the bus voltage and the injection of the disturbance component of the specific frequency constitute a positive feedback mechanism in a power management unit control loop. In a grid-connected mode of a DC grid, the positive feedback mechanism fails due to a control action of a voltage management unit on a bus, and the bus voltage remains stable. In an islanding mode of the DC grid, under an action of the positive feedback mechanism, the power management unit allows the bus voltage to generate a self-excited oscillation at the specific frequency.

Abstract: The present disclosure relates to the technical field of solid waste recycling and fabricated buildings, and provides a solid waste large-mixing-amount concrete prefabricated laminated slab and a preparation method thereof. The solid waste large-mixing-amount concrete prefabricated laminated slab provided by the present disclosure comprises a prefabricated layer and a laminated layer. Transverse grooves and longitudinal grooves are formed in the surface of the prefabricated layer. During application, the grooves can be used for erecting pipelines, the contact area of the prefabricated layer and the laminated layer can also be increased, the combined effect of new concrete and old concrete is improved, the integrity of a floor slab is enhanced, and the effect of improving the overall stress capacity of the floor slab is achieved.

Abstract: Examples of the present disclosure provide a method and an apparatus for processing a brightness of a display screen, and an electronic device. The method includes: obtaining a subject object of an image based on image information of the image; obtaining a first contrast of the subject object and a first gray level of the image; and adjusting a brightness of a display screen displaying the image based on the first contrast and the first gray level.

Abstract: Examples of the present disclosure provide a method and an apparatus for processing a brightness of a display screen, and an electronic device. The method includes: obtaining a subject object of an image based on image information of the image; obtaining a first contrast of the subject object and a first gray level of the image; and adjusting a brightness of a display screen displaying the image based on the first contrast and the first gray level.

Abstract: The present disclosure relates to the technical field of solid waste recycling and fabricated buildings, and provides a solid waste large-mixing-amount concrete prefabricated laminated slab and a preparation method thereof. The solid waste large-mixing-amount concrete prefabricated laminated slab provided by the present disclosure comprises a prefabricated layer and a laminated layer. Transverse grooves and longitudinal grooves are formed in the surface of the prefabricated layer. During application, the grooves can be used for erecting pipelines, the contact area of the prefabricated layer and the laminated layer can also be increased, the combined effect of new concrete and old concrete is improved, the integrity of a floor slab is enhanced, and the effect of improving the overall stress capacity of the floor slab is achieved.

Abstract: Multi-solid waste activated concretes with high-silicon iron ore tailings and preparation methods thereof are disclosed. In at least some embodiments, the concrete is prepared from raw materials including 360-380 kg/m3 of a cement, 30-40 kg/m3 of fly ash, 30-40 kg/m3 of a modified ultrafine sand of high-silicon iron ore tailings, 930-950 kg/m3 of a waste stone of tailings, 870-930 kg/m3 of a fine sand of tailings, 160-170 kg/m3 of water, and 4-8 kg/m3 of an additive.

Abstract: A method for a direct current (DC) islanding detection based on positive feedback of a bus voltage at a specific frequency, essentially including three steps: extraction of a specific frequency component of the bus voltage, injection of a disturbance component of the specific frequency, and determination of DC islanding. The extraction of the specific frequency component of the bus voltage and the injection of the disturbance component of the specific frequency constitute a positive feedback mechanism in a power management unit control loop. In a grid-connected mode of a DC grid, the positive feedback mechanism fails due to a control action of a voltage management unit on a bus, and the bus voltage remains stable. In an islanding mode of the DC grid, under an action of the positive feedback mechanism, the power management unit allows the bus voltage to generate a self-excited oscillation at the specific frequency.