Abstract: Disclosed is an air microorganism enrichment device in farms. The device comprises a shell, a collection assembly, an air extraction component, a flow monitoring component, a display component and a processing component, wherein the collection assembly is detachably arranged on the shell and can fix the relative position with the shell; the collection assembly is provided with a collection cavity, a collection air inlet and a collection air outlet, and is used for collecting microorganisms introduced in the air; the air extraction component communicates with the collection air outlet; the flow monitoring component monitors the exhaust flow of an air outlet pipeline and sends a flow signal; and the processing component is in communication connection with the flow monitoring component and the display component, and the processing component receives the flow signal and transmits the flow signal to the display component to display exhaust flow information.

Abstract: A control circuit for a switching converter with a front stage circuit converting an input line voltage into a bus voltage and a rear stage circuit converting the bus voltage into an output voltage to power a load. The control circuit includes a rear stage control circuit providing a rear switch control signal to control the rear stage circuit and a front stage control circuit providing a front switch control signal to control the front stage circuit. The rear stage control circuit has a first pin and changes a voltage at the first pin based on an input line voltage state and a load state. The front stage control circuit has a second pin coupled to the first pin of the rear stage control circuit and regulates the bus voltage based on the voltage at the second pin.

Abstract: A controller used in an isolated switching converter. The controller has an error amplifying circuit for generating a first compensation signal based on the difference between an output feedback signal and a reference voltage, a control generator for generating a first and second control signals based on the first compensation signal, an isolation circuit for providing a first synchronous signal electrically isolated from the first control signal and a second synchronous signal electrically isolated from the second control signal, an upper threshold generator for providing an upper threshold voltage, and a peak current generator for providing a peak current signal for controlling a peak value of a current flowing through the primary switch based on the first synchronous signal, the second synchronous signal and the upper threshold voltage. The upper threshold voltage is adjusted above a first upper threshold voltage when a peak power demand is made.

Abstract: A control circuit for a voltage conversion circuit is provided. The control circuit includes a duty cycle control circuit, a feedback frequency control circuit and a secondary driving control circuit. The duty cycle control circuit provides a switching time control signal based on an on-period of a secondary switch of the voltage conversion circuit. The switching time control signal indicates a first duration. The feedback frequency control circuit provides a feedback frequency control signal based on a feedback signal operable to indicate a load of the voltage conversion circuit. The feedback frequency control signal indicates a second duration. The secondary driving control circuit provides a switching release signal based on the switching time control signal and the feedback frequency control signal. The switching release signal turns on a primary switch of the voltage conversion circuit in response to the first duration and the second duration.

Abstract: A screening method for a drought-resistant germplasm of Ophiopogon japonicus related to the field of Ophiopogon japonicus planting is provided. The method uses Ophiopogon japonicus of the main production areas, which requires a large amount of water and rainfall during the growth period, the drought-resistant germplasm that is suitable for growing well is conducted with drought stress under the drought condition. The growth indicators and the physiological indicators of different Ophiopogon japonicus germplasm under drought stress conditions are comprehensively evaluated and ranked to evaluate the drought-resistant ability of the different germplasm. The screening method is scientific and effective, and can comprehensively evaluate the drought resistance ability of Ophiopogon japonicus under the drought stress conditions, laying a technical foundation for the screening and promotion of in the Ophiopogon japonicus with drought resistance ability.

Abstract: In an example embodiment, the network device includes a housing; at least one set of first antennas and at least one set of second antennas, respectively arranged on a plurality of sides of the housing at a 45 degrees inclination with respect to a longitudinal direction of the housing, the second antennas spaced apart from the first antennas arranged on the same side by a predetermined distance in the longitudinal direction, to enable the at least one set of first antennas and the at least one set of second antennas to have a predetermined antenna isolation; a controller configured to adjust, based on an operating mode of the network device, a phase and an amplitude of a channel associated with the at least one set of first antennas and/or the at least one set of second antennas, to make channel state information of a plurality of channels associated with a same set of first antennas and/or second antennas related or disrelated with each other.

Abstract: A 100-meter gridded spatialization method for carbon emissions of different land use types based on multi-source heterogeneous data is provided, including the following steps: S1, fitting Luojia-1A Satellite nighttime light data year by year with defense meteorological satellite program-operational linescan system (DMSP-OLS) and national polar-orbiting partnership-visible infrared imaging radiometer (NPP-VIIRS) fused 1-kilometer gridded nighttime light data, performing additive fusion on previous light data and current light data, introducing a time inertia weight factor to improve particle swarm optimization-back propagation (BP) neural network algorithm, and forming 100-meter nighttime light data correctable on a long time series; and S2, simulating a complex nonlinear dynamic changing relationship between multilevel 100-meter gridded data of different land use types in different industries and energy carbon emissions in different industries based on the 100-meter nighttime light data, and establishing a 10

Abstract: A controller for an isolated switching converter having a transformer, a primary switch and a secondary switch. The controller has an error amplifying circuit, a mode judgement circuit and a gate driver. The error amplifying circuit provides a compensation signal based on an output feedback signal and a reference voltage. The mode judgement circuit provides a mode signal to determine a first drive mode or a second drive mode based on a voltage across the secondary switch and the compensation signal. In the first drive mode, the secondary switch is turned on for a second ON-time by the gate driver after a current flowing through the secondary switch crosses zero. And in the second drive mode, the ON-state of the secondary switch is extended for an extended ON-time by the gate driver.

Abstract: This application is directed to device synchronization and alignment in extended reality. Two electronic devices create two maps of a scene according to two distinct coordinate systems. A first electronic device determines a device pose of a second electronic device in a first coordinate system of the first electronic device. The device pose is used to determine a transformation relationship between the two coordinate systems. The first electronic device obtains a second object pose that is measured in a second coordinate system of the second electronic device and used to render an object in a second map of the second electronic device. The second object pose is converted to a first object pose in the first coordinate system based on the transformation relationship. The object is rendered concurrently in the first and second maps of the first and second electronic devices based on the first and second object poses, respectively.

Abstract: A screening method for a drought-resistant germplasm of Ophiopogon japonicus related to the field of Ophiopogon japonicus planting is provided. The method uses Ophiopogon japonicus of the main production areas, which requires a large amount of water and rainfall during the growth period, the drought-resistant germplasm that is suitable for growing well is conducted with drought stress under the drought condition. The growth indicators and the physiological indicators of different Ophiopogon japonicus germplasm under drought stress conditions are comprehensively evaluated and ranked to evaluate the drought-resistant ability of the different germplasm. The screening method is scientific and effective, and can comprehensively evaluate the drought resistance ability of Ophiopogon japonicus under the drought stress conditions, laying a technical foundation for the screening and promotion of in the Ophiopogon japonicus with drought resistance ability.

Abstract: A method and apparatus for detecting a table. The method includes: acquiring a to-be-processed image; inputting the to-be-processed image into a pre-trained deep learning model, and outputting a full table detection branch result, a column detection branch result and a header detection branch result through the deep learning model; where the full table detection branch result represents a detection result for a full table in the to-be-processed image, the column detection branch result represents a detection result for a column in the table in the to-be-processed image, and the header detection branch result represents a detection result for a header in the to-be-processed image; and obtaining a detection result of the table in the to-be-processed image, based on the full table detection branch result, the column detection branch result and the header detection branch result.

Abstract: A flyback converter with improved performance is discussed. The flyback converter may be nor may not be under a burst mode; or may exit from the burst mode. When the flyback converter is under a normal operation mode, the secondary power switch is turned on after the primary power switch is turned off, until an OFF condition of is met; and the secondary power switch is turned on again for an additional time before the primary power switch is turned on at a next switching cycle. When the flyback converter enters the burst mode and then exits from the burst mode, the secondary power switch is not turned on again for the additional time before a primary power switch's turn-on at the next switching cycle.

Abstract: A flyback converter with improved performance is discussed. The flyback converter has a control and drive circuit, which drives the primary power switch with a weak drive if the time interval between two adjacent turn-ons of the primary power switch is longer than the reference time length; and drives the primary power switch with a strong drive if the time interval between two adjacent turn-ons of the primary power switch is shorter than the reference time length.

Abstract: This application is directed to device synchronization and alignment in extended reality. Two electronic devices create two maps of a scene according to two distinct coordinate systems. A first electronic device determines a device pose of a second electronic device in a first coordinate system of the first electronic device. The device pose is used to determine a transformation relationship between the two coordinate systems. The first electronic device obtains a second object pose that is measured in a second coordinate system of the second electronic device and used to render an object in a second map of the second electronic device. The second object pose is converted to a first object pose in the first coordinate system based on the transformation relationship. The object is rendered concurrently in the first and second maps of the first and second electronic devices based on the first and second object poses, respectively.

Abstract: A method for producing a seed powder-polycarboxylic acid monoester wood adhesive using a bio-based feedstock includes: generating a functionalized powder feedstock by moderate degradation of the powder feedstock with appropriate water content in the existence of a multifunctional catalyst and simultaneous esterification with a cyclic anhydride to introduce a curable functional group; and mixing the separated functionalized powder with water and adding a curing additive to form a thermo-curable wood adhesive. Double-layer plywood samples were prepared according to ASTM International Standard 2017, D2339-98 and solidified for 3-10 min under 3 MPa pressure in a hot press at temperatures between 150-200° C. The double-layer plywood samples showed dry and wet strengths of up to 3.5 MPa and a wood failure rate of more than 80%.

Abstract: A speckle-suppressing lighting system includes an optical waveguide, a first solid-state light source, a second solid-state light source, and a diffuser. The optical waveguide has a proximal end and a distal end. At least part of the diffuser is between the proximal end and the distal end. The first solid-state light source is optically coupled to the optical waveguide near the proximal end, and emits a first light beam that propagates toward the distal end and has a first center wavelength. The second solid-state light source is optically coupled to the optical waveguide near the proximal end, and emits a second light beam that propagates toward the distal end and has a second center wavelength differing from the first center wavelength. The diffuser diffuses the first light beam and the second light beam.

Abstract: Disclosed is an air microorganism enrichment device in farms, and relates to the technical field of air microorganism collection.

Abstract: A controller used in an isolated switching converter. The controller has an error amplifying circuit for generating a first compensation signal based on the difference between an output feedback signal and a reference voltage, a control generator for generating a first and second control signals based on the first compensation signal, an isolation circuit for providing a first synchronous signal electrically isolated from the first control signal and a second synchronous signal electrically isolated from the second control signal, an upper threshold generator for providing an upper threshold voltage, and a peak current generator for providing a peak current signal for controlling a peak value of a current flowing through the primary switch based on the first synchronous signal, the second synchronous signal and the upper threshold voltage. The upper threshold voltage is adjusted above a first upper threshold voltage when a peak power demand is made.