Abstract: The present disclosure provides a resource utilization method of crude sodium sulfate. The method comprises the following step: reducing the crude sodium sulfate to form a sodium sulfide solution; making the sodium sulfide solution perform a first reaction with chlorine to obtain sulfur and a sodium chloride solution; and electrolyzing the sodium chloride solution to obtain a sodium hydroxide solution and chlorine, and supplying the generated chlorine to the sodium sulfide solution to perform the first reaction.

Abstract: Techniques, systems, and devices are described for providing a computational frame for estimating high-dimensional stochastic behaviors. In one exemplary aspect, a method for performing numerical estimation includes receiving a set of measurements of a stochastic behavior. The set of correlated measurements follows a non-standard probability distribution and is non-linearly correlated. Also, a non-linear relationship exists between a set of system variables that describes the stochastic behavior and a corresponding set of measurements. The method includes determining, based on the set of measurements, a numerical model of the stochastic behavior. The numerical model comprises a feature space comprising non-correlated features corresponding to the stochastic behavior. The non-correlated features have a dimensionality of M and the set of measurements has a dimensionality of N, M being smaller than N.

Abstract: The present disclosure relates to a frequency modulation device, a switching power supply and a frequency modulation method thereof. The device includes: a waveform generation unit (10) configured to generate a periodic signal required for performing frequency modulation on a clock signal of a switching power supply to be controlled; a frequency modulation unit (20) configured to perform voltage-current conversion and arithmetic processing based on the periodic signal to obtain a frequency modulation current required for performing the frequency modulation on the clock signal of the switching power supply to be controlled; and an RC oscillation unit (30) configured to perform RC oscillation processing based on the frequency modulation current to obtain a frequency oscillation signal as the clock signal of the switching power supply to be controlled.

Abstract: Techniques, systems, and devices are described for providing a computational frame for estimating high-dimensional stochastic behaviors. In one exemplary aspect, a method for performing numerical estimation includes receiving a set of measurements of a stochastic behavior. The set of correlated measurements follows a non-standard probability distribution and is non-linearly correlated. Also, a non-linear relationship exists between a set of system variables that describes the stochastic behavior and a corresponding set of measurements. The method includes determining, based on the set of measurements, a numerical model of the stochastic behavior. The numerical model comprises a feature space comprising non-correlated features corresponding to the stochastic behavior. The non-correlated features have a dimensionality of M and the set of measurements has a dimensionality of N, M being smaller than N.

Abstract: The present disclosure relates to a frequency modulation device, a switching power supply and a frequency modulation method thereof. The device includes: a waveform generation unit (10) configured to generate a periodic signal required for performing frequency modulation on a clock signal of a switching power supply to be controlled; a frequency modulation unit (20) configured to perform voltage-current conversion and arithmetic processing based on the periodic signal to obtain a frequency modulation current required for performing the frequency modulation on the clock signal of the switching power supply to be controlled; and an RC oscillation unit (30) configured to perform RC oscillation processing based on the frequency modulation current to obtain a frequency oscillation signal as the clock signal of the switching power supply to be controlled.

Abstract: An intelligent multifunctional storage cabinet device includes a smart cabinet and a backend control terminal, wherein the smart cabinet is connected to and communicates with the backend control terminal via a network connection. The smart cabinet includes a cabinet and a monitoring device. The monitoring device is installed on the top of the cabinet, and the monitoring device is connected to and communicates with the backend control terminal via a network connection. The cabinet includes a parcel storage component comprising a plurality of parcel storage compartments, a food storage component comprising a plurality of food storage compartments, and a key storage component comprising a plurality of key storage compartments. The key storage compartment is located between the parcel storage compartment and the food storage compartment. The parcel storage compartment is located at one side of the food storage compartment.

Abstract: An intelligent multifunctional storage cabinet device includes a smart cabinet and a backend control terminal, wherein the smart cabinet is connected to and communicates with the backend control terminal via a network connection. The smart cabinet includes a cabinet and a monitoring device. The monitoring device is installed on the top of the cabinet, and the monitoring device is connected to and communicates with the backend control terminal via a network connection. The cabinet includes a parcel storage component comprising a plurality of parcel storage compartments, a food storage component comprising a plurality of food storage compartments, and a key storage component comprising a plurality of key storage compartments. The key storage compartment is located between the parcel storage compartment and the food storage compartment. The parcel storage compartment is located at one side of the food storage compartment.

Abstract: Disclosed is a reference voltage circuit with low temperature drift, including a first voltage unit, a second voltage unit and a K times' amplification unit. The first voltage unit is configured to generate a first voltage, with a first end thereof being grounded. The K times' amplification unit is configured to amplify the first voltage by K times, with a first end thereof being connected to a second end of the first voltage unit, and with a second end thereof being connected to a first end of the second voltage unit, wherein K is a constant greater than zero. The second voltage unit is configured to generate a second voltage, with the first end thereof being connected to a current source circuit, and a second end thereof being connected to a third end of the first voltage unit to serve as an output end of a reference voltage (VREF).

Abstract: The present disclosure discloses a gas water heating apparatus comprising: a shell; a burner, a heat exchanger, and a fan which are disposed in sequence within the shell, wherein a combustion region is formed between the burner and the heat exchanger that are spaced from each other by a first preset distance; a first enclosing frame that encloses the combustion region, an air inlet portion being disposed on a side wall of the first enclosing frame; a heat insulating plate which is disposed within the first enclosing frame and is spaced from an inner surface of the side wall of the first enclosing frame by a second preset distance, wherein when the fan is in operation, air outside the first enclosing frame can flow into a region between the first enclosing frame and the heat insulating plate through the air inlet portion. The present disclosure provides a gas water heating apparatus having an optimized temperature reducing structure and capable of achieving a significant temperature reduction effect.

Abstract: The present invention discloses a burner, a gas water heater and a processing method of fire row, wherein the burner comprising: a plurality of fire rows; an air channel is formed between at least two fire rows; the fire row has a burning substrate; the burning substrate is provided with main burning holes; the burning substrate is further provided with auxiliary burning holes downstream of the main burning holes; at least one the auxiliary burning hole is disposed on at least one side of the main burning hole in a length direction of the burning substrate; flame of the auxiliary burning hole intersect with flame of the main burning hole; and a frame for mounting the fire rows. The burner, the gas water heater and the processing method of the fire rows disclosed in the present invention can help to decrease flame height, facilitate manufacturing and reduce costs.

Abstract: The embodiments of the present disclosure relate to a technical field of home electrical appliances, and particularly to methods, apparatus, systems, and electronic devices for voice controlling a smart home electrical appliance. The method includes: acquiring speech information of a user; performing a recognition on the speech information to acquire a control command; determining a target home electrical appliance according to the control command, and transmitting the control command to the target home electrical appliance; and acquiring a first execution result sent back from the target home electrical appliance, wherein the first execution result represents a state of the target home electrical appliance.

Abstract: This Invention provides a parking space service and management system based on parking space state information, comprising a cloud server (1), as well as a supervisor terminal (2), a driver terminal (3), a vehicle detection module (4), a field terminal component (5) and a parking enforcement terminal (6) connected to the cloud server (1); The cloud server (1) is used to receive, store, process and update the parking space state information, which includes a parking space code, a parking space state and a time for state change, and is mainly determined by an occupancy state of the vehicle detection module (4), a parking space information, a parking space reservation information and check-in/check-out information; wherein the parking space states include states of the parking space occupied, the parking space vacant and the parking space specific.

Abstract: A black phosphorus crystal having a high photoelectric response rate, a two-dimensional black phosphorus PN junction, and preparation method and use thereof. The black phosphorus crystal is a single crystal with a spatial point group Cmca (No. 64), cell parameters a=3.2-3.4 ?, b=10.4-10.6 ?, c=4.3-4.5 ?, and an interlayer spacing of 4-6 ?, and is characterized by a high photoelectric response rate, an adjustable semiconductor type, and the like. The two-dimensional black phosphorus PN junction includes a two-dimensional black phosphorus film, a first area of the film forming an n-type semiconductor by n-type doping, a second area of the film is maintained as a p-type semiconductor, and the first area is adjacent to the second area, to enable the n-type semiconductor to be combined with the p-type semiconductor to form the PN junction. The two-dimensional black phosphorus PN junction has properties such as a unidirectional conductivity, or a special photovoltaic effect.

Abstract: Disclosed are a clock compensation circuit, a clock circuit and a microcontroller. The clock compensation circuit may include: a detection circuit, configured to detect a capacitance control parameter capable of affecting a clock frequency output by a clock circuit; and a control unit, connected with the detection circuit, and configured to adjust a capacitance value of a target capacitor in the clock circuit according to the capacitance control parameter detected by the detection circuit, so as to change the clock frequency output by the clock circuit. With the clock compensation circuit, the clock circuit and the microcontroller, the problem of large fluctuation of a clock frequency output by a clock circuit in the related art is solved.

Abstract: Disclosed is a reference voltage circuit with low temperature drift, including a first voltage unit, a second voltage unit and a K times' amplification unit. The first voltage unit is configured to generate a first voltage, with a first end thereof being grounded. The K times' amplification unit is configured to amplify the first voltage by K times, with a first end thereof being connected to a second end of the first voltage unit, and with a second end thereof being connected to a first end of the second voltage unit, wherein K is a constant greater than zero. The second voltage unit is configured to generate a second voltage, with the first end thereof being connected to a current source circuit, and a second end thereof being connected to a third end of the first voltage unit to serve as an output end of a reference voltage (VREF).

Abstract: Disclosed are a clock compensation circuit, a clock circuit and a microcontroller. The clock compensation circuit may include: a detection circuit, configured to detect a capacitance control parameter capable of affecting a clock frequency output by a clock circuit; and a control unit, connected with the detection circuit, and configured to adjust a capacitance value of a target capacitor in the clock circuit according to the capacitance control parameter detected by the detection circuit, so as to change the clock frequency output by the clock circuit. With the clock compensation circuit, the clock circuit and the microcontroller, the problem of large fluctuation of a clock frequency output by a clock circuit in the related art is solved.

Abstract: A black phosphorus crystal having a high photoelectric response rate, a two-dimensional black phosphorus PN junction, and preparation method and use thereof. The black phosphorus crystal having a high photoelectric response rate is a single crystal with a spatial point group Cmca (No. 64), cell parameters a=3.2-3.4 ?, b=10.4-10.6 ?, c=4.3-4.5 ?, and an interlayer spacing of 4-6 ?, and is characterized by a high photoelectric response rate, an adjustable semiconductor type, and the like. Its preparation method is simple with a mild condition, a high yield, a low cost, and less pollution. The two-dimensional black phosphorus PN junction comprises a two-dimensional black phosphorus film, a first area of the film forming an n-type semiconductor by n-type doping, a second area of the film is maintained as a p-type semiconductor, and the first area is adjacent to the second area, to enable the n-type semiconductor to be combined with the p-type semiconductor to form the PN junction.

Abstract: The present invention relates to the technical field of public transportation, and discloses a method for sharing an electric power-assisted bicycle. The method includes: unlocking a bicycle lock of the electric power-assisted bicycle by means of scanning a code; and installing a self-brought power source on the electric power-assisted bicycle. The method for sharing an electric power-assisted bicycle in the present invention solves the problem of power source charging and the problem of being tired in riding a shared bicycle by means of a user's self-brought power source, and shares the electric power-assisted bicycle without sharing; the power source. The method can be popularized in a large scale, has a wide market prospect, and can also enable a user to take more care of the electric power-assisted bicycle during riding, thereby increasing the service life of the electric power-assisted bicycle.

Abstract: The present invention discloses a book self-borrowing system and method. The system includes a bookcase device, a client terminal and a network control device, the network control device being connected to the client terminal, the network control device being connected to the bookcase device, and the bookcase device including a book borrowing module, a book returning module, a book sharing module and a timing module. A user can place an idle book at the bookcase device, so that a personal idle book can be read more times via the bookcase device, which improves the usage rate of the idle book.