Abstract: An automatic peeling and splitting device for citrus fruits includes a bracket, a pomelo fixing module, and a pomelo peeling module arranged on the bracket. The pomelo fixing module includes a cylinder arranged on an upper part of the bracket, a fixed block arranged on a power output end of the cylinder, and a motor arranged on the fixed block, the power output end of the motor is connected with a rotation shaft, an end of the rotation shaft is sleeved with an air sac, and the end of the rotation shaft is further hinged with a plurality of arc baffles, a concave member of the arc baffle is bonded to a surface of the air sac, an outer convex edge of the arc baffle faces outside of the air sac; the rotation shaft and the power output end of the cylinder are both extended vertically downward.

Abstract: A magnetic attraction structure for a wireless charging device or a terminal device is provided, which includes one or more electromagnets. The electromagnet includes an iron core and a winding group. The iron core includes a first plate, a second plate and a connecting part. The first plate is separated from the second plate by a distance, and the connecting part is connected between the first plate and the second plate, and the winding group surrounds the connecting part. A side surface of a long side of the first plate and a side surface of a long side of the second plate are configured to face a cover plate of the wireless charging device or a cover plate of the terminal device. A wireless charging device including the above-mentioned magnetic attraction structure is also provided.

Abstract: A feature extraction method of fruit spectrum includes taking a vector of each wavelength point in spectrum of samples as source data, and acquiring a sorting of all vectors by processing the source data by SPA; according to the sorting of the vectors, acquiring distribution points of each sample on a coordinate system; acquiring classification results of the samples by destructive analysis, and acquiring a number of first sample categories; acquiring a first Euclidean distance between the first sample categories; according to a sorting of the wavelength points, acquiring distribution points of each sample on the coordinate system; acquiring a number of second sample categories; acquiring a second Euclidean distance between the second sample categories; determining whether the first Euclidean distance is less than the second Euclidean distance; determine a (M+2)-th vector to be valid or invalid based on a comparison result.

Abstract: An automatic peeling and splitting device for citrus fruits includes a bracket, a pomelo fixing module, and a pomelo peeling module arranged on the bracket. The pomelo fixing module includes a cylinder arranged on an upper part of the bracket, a fixed block arranged on a power output end of the cylinder, and a motor arranged on the fixed block, the power output end of the motor is connected with a rotation shaft, an end of the rotation shaft is sleeved with an air sac, and the end of the rotation shaft is further hinged with a plurality of arc baffles, a concave member of the arc baffle is bonded to a surface of the air sac, an outer convex edge of the arc baffle faces outside of the air sac; the rotation shaft and the power output end of the cylinder are both extended vertically downward.

Abstract: A feature extraction method of fruit spectrum includes taking a vector of each wavelength point in spectrum of samples as source data, and acquiring a sorting of all vectors by processing the source data by SPA; according to the sorting of the vectors, acquiring distribution points of each sample on a coordinate system; acquiring classification results of the samples by destructive analysis, and acquiring a number of first sample categories; acquiring a first Euclidean distance between the first sample categories; according to a sorting of the wavelength points, acquiring distribution points of each sample on the coordinate system; acquiring a number of second sample categories; acquiring a second Euclidean distance between the second sample categories; determining whether the first Euclidean distance is less than the second Euclidean distance; determine a (M+2)-th vector to be valid or invalid based on a comparison result.

Abstract: A floating observation system includes a floating platform. The floating platform includes an upper deck, upright posts, a device compartment, a ballast compartment, a radome structure and a device installation base. Top ends of the upright posts are connected to the upper deck, and bottom ends of the upright posts are connected to the device compartment. The ballast compartment is connected to the device compartment. The radome structure is borne on the upper deck. The device installation base is arranged on an outer surface of the floating platform. Various types of auxiliary devices are borne by the upper deck and the device compartment on the floating platform. Various observation devices borne by the device installation base are arranged on the outer surface of the floating platform to observe different kinds of information and to observe spaces above, on and under water, thus meeting a demand for comprehensive observation in all dimensions.

Abstract: Disclosed is a casting ladle for casting aluminum alloy in the present application. The casting ladle includes a liner contact layer, a first thermal insulation layer, a second thermal insulation layer, and a housing layer sequentially from inside to outside. The first thermal insulation layer includes first Al2O3 particles and at least one first oxide particle selected from the group consisting of first SiO2 particles, first CaO particles, and first MgO particles. The second thermal insulation layer includes at least one second oxide particle selected from the group consisting of second Al2O3 particles, second SiO2 particles, second CaO particles, and second MgO particles. The second thermal insulation layer has a porosity of 60-75% and a pore size of 2-5 mm.

Abstract: A moving part of a maglev train, comprising two levitation frames that are arranged at an interval along the direction of travel, the two levitation frames being connected by means of a vertical beam; a peripheral wall of the vertical beam provided with a slot that may reduce the torsional rigidity thereof, being capable of reducing the torsional rigidity of the traditional vertical beam so as to reduce the coupling effect between the two levitation frames that are connected by means of the vertical beam, thereby greatly reducing the difficulty and energy consumption of levitation control. The levitation frames and the train body are provided therebetween with a vertical shock absorber and a horizontal absorber having suitable damping values, the levitation frames and the train body are provided therebetween with horizontal stoppers and vertical stoppers which may prevent excessive horizontal movement, rollover and overturning.

Abstract: An ultra wide band (UWB) antenna includes: a radiator, including a waveguide cavity which has opposite open-end faces; and a feeding end, disposed on one of the open-end faces. The UWB antenna according to the present disclosure overcomes the technical problems that a horn antenna in related technologies is difficult to be applied to an integrated communication terminal due to its large size, complicated structure, and difficulties in processing.

Abstract: A heat exchanger, the heat exchanger including flat tubes and fins. The flat tubes are provided at intervals along the thickness direction of the flat tubes. The flat tubes are internally provided with fluid channels extending along the longitudinal direction of the flat tubes. The fins are provided between adjacent flat tubes. A plurality of fins between adjacent flat tubes are provided at intervals along the transverse direction of the flat tubes. Each fin extends along the longitudinal direction of the flat tubes. Ventilation windows are provided on the fins.

Abstract: Provided are a potentiometric biosensor (100) and a method for detecting urea concentration in a sample. The potentiometric biosensor (100) comprises an indication electrode (23) and a reference electrode (24). A second reaction reagent on the indication electrode (23) comprises a urease but does not comprise an electron transporter. A first reaction reagent on the reference electrode (24) comprises an electron transporter but does not comprise a urease. In the case where no external voltage is applied, after a blood sample has been added, the urease catalyzes the reaction of urea in the sample, thereby causing a potential difference between the indication electrode (23) and the reference electrode (24). Furthermore, the potential difference between the indication electrode (23) and the reference electrode (24) is in a linear relationship with the urea concentration in the sample, and the urea concentration in the sample can be calculated according to such linear relationship.

Abstract: Devices and techniques are generally described for rejecting false invocations of speech processing skills. In various examples, utterance data comprising automatic speech recognition (ASR) data and natural language understanding (NLU) data may be received. In some examples, ASR confidence data indicating a confidence level of the ASR data may be received. In further examples, NLU confidence data indicating a confidence level of the NLU data may be received. A machine learning model may determine, based at least in part on the ASR confidence data and the NLU confidence data, first false invocation data indicating a likelihood of false invocation of a speech processing skill. In some examples, a first directive may be sent to the speech processing system based at least in part on the first false invocation data. The first directive may be effective to cause the speech processing system to end a current dialog session.

Abstract: A server, system, and client are provided. The server receives audio data from one or more clients; receives an audio data request from a requesting client, and obtains, from the audio data request, a mixing manner of audio data requested by the requesting client; preprocesses audio data of a client of the one or more clients that corresponds to the audio data request using the obtained mixing manner; and sends the preprocessed audio data to the requesting client.

Abstract: A method and a device for controlling a low-temperature refrigeration air valve, the method includes: acquiring a current environment temperature; according to the current environment temperature, determining an initial target pressure of the current system and an initial opening degree of an air valve; acquiring an actual pressure of the current system and a target pressure of the current system; and adjusting an opening degree of the air valve according to a difference value between the target pressure of the current system and the actual pressure of the current system, wherein the air valve is disposed at a low-temperature cover. An opening degree of the air valve is adjusted according to the difference value between the target pressure of the current system and the actual pressure of the current system, to meet the refrigeration demand of the user in an ultra-low temperature environment, expanding the operation scope of refrigeration.

Abstract: A control method and device for a low-temperature cooling air valve include: obtaining an actual system pressure, an ambient temperature, and a system energy requirement; and determining an opening degree pre according to the actual system pressure, the ambient temperature, and the system energy requirement. The control method is employed to perform combined control on the low-temperature cooling air valve according to the system high pressure, the ambient temperature and the system energy requirement, and can refine the range of opening degrees of the low-temperature cooling air valve and determine an opening degree thereof, thereby facilitating cooling operation of a multi-split air conditioning system in an ultra-low temperature environment, while also increasing the reliability of the cooling operation at low temperature and expanding the operation range.

Abstract: An ultra wide band (UWB) antenna includes: a radiator, including a waveguide cavity which has opposite open-end faces; and a feeding end, disposed on one of the open-end faces. The UWB antenna according to the present disclosure overcomes the technical problems that a horn antenna in related technologies is difficult to be applied to an integrated communication terminal due to its large size, complicated structure, and difficulties in processing.

Abstract: The disclosure includes a platinum-based alloy catalyst and a preparation method thereof, a membrane electrode and a fuel cell. The method for preparing the platinum-based alloy catalyst comprises the following steps: (1) preparing nano-sized alloy particles of platinum and 3d transition metal; (2) carrying out acid treatment on the alloy particles prepared in step (1); and (3) annealing the alloy particles treated in step (2). The size of the platinum-based alloy particles is controlled, an atom number ratio of platinum to transition metal in the platinum-based alloy is controlled, and then etching and dissolution of acid is combined so that an atom number ratio of platinum to transition metal is further controlled, subsequently annealing is carried out at high temperature. The prepared platinum-based alloy catalyst improves the stability and durability of the platinum-based alloy catalyst, which supports the large-scale application of the platinum-based alloy catalyst in the fuel cell.

Abstract: An electronic apparatus includes a touch panel, a frame, a display panel, a spacer and a plurality of adjusting elements. The display panel is at least partially disposed between the touch panel and the frame. The spacer is connected with a side of the display panel facing to the frame. The adjusting elements are at least partially embedded in the frame and at least partially rotatable relative to the frame. Each of the adjusting elements has an elliptical structure slidably connected with the spacer. When at least one of the elliptical structures rotates, the spacer is pressed by the corresponding elliptical structure, such that the spacer and the display panel move towards the touch panel until the display panel is in contact with the touch panel.

Abstract: The disclosure includes a platinum-based alloy catalyst and a preparation method thereof, a membrane electrode and a fuel cell. The method for preparing the platinum-based alloy catalyst comprises the following steps: (1) preparing nano-sized alloy particles of platinum and 3d transition metal; (2) carrying out acid treatment on the alloy particles prepared in step (1); and (3) annealing the alloy particles treated in step (2). The size of the platinum-based alloy particles is controlled, an atom number ratio of platinum to transition metal in the platinum-based alloy is controlled, and then etching and dissolution of acid is combined so that an atom number ratio of platinum to transition metal is further controlled, subsequently annealing is carried out at high temperature. The prepared platinum-based alloy catalyst improves the stability and durability of the platinum-based alloy catalyst, which supports the large-scale application of the platinum-based alloy catalyst in the fuel cell.

Abstract: An external extended device, an audio processing method and an audio playback method are provided. The external extended device is configured to receive power supplied and a signal transmitted by a television device and the external extended device includes: an integrated physical interface connecting the external extended device and the television device; and a sound-mixing processing chip electrically connected with the integrated physical interface and configured to: acquire an accompaniment audio signal transmitted by the television device via the integrated physical interface; perform sound-mixing processing on a user voice signal gathered by a microphone device and the accompaniment audio signal; and transmit a sound-mixed signal to a power amplifier circuit of the television device via the integrated physical interface.