Abstract: Disclosed are a photovoltaic shutdown circuit and a photovoltaic system. The photovoltaic shutdown circuit comprises a shutdown power line, a signal receiving module, a signal processing module, and a controllable switch module. The signal processing module comprises a signal modulation unit and a threshold comparison unit. A switch end of the controllable switch module is connected in series to the shutdown power line. The signal receiving module is connected to the shutdown power line for receiving a first signal with a controlling signal; the signal modulation unit is for reverting the controlling signal; the threshold comparison unit is connected to the signal modulation unit to receive the reverted controlling signal and compare the reverted controlling signal with a set threshold to output a driving signal. The controllable switch module is connected to the threshold comparison unit to receive the driving signal and control an on/off of the controllable switch module.

Abstract: Provided is a carbon dioxide fluidity control device comprising, a sample preparation tank, a high-pressure stirring unit, a reciprocating plunger pump and a booster pump, wherein the stirring unit comprises one or more high-pressure stirring tanks, each provided with an atomizing spray probe and a piston, wherein a discharge port of the sample preparation tank is connected to the atomizing spray probe via a plunger pump, which is connected to the piston to push the piston to reciprocate; the booster pump is connected to the high-pressure stirring tanks to provide supercritical carbon dioxide to the high-pressure stirring tank; and a discharge port of the high-pressure stirring tanks is connected to an oilfield well group. Provided is a carbon dioxide fluidity control method using the device, comprising mixing surfactants and nanoparticles with heated carbon dioxide, and injecting a microemulsion of supercritical carbon dioxide and nano-silicon dioxide into an oilfield well group.

Abstract: The invention provides a method and device for protecting a child inside a vehicle, a computer device, a computer-readable storage medium, and a vehicle, which are applied to the technical field of automobiles. The method for protecting a child inside a vehicle includes: receiving image data inside a vehicle; performing facial detection on the image data to detect passengers in the vehicle; further classifying the detected passengers in the vehicle into children and adults according to the facial detection; and performing a corresponding protection operation when a result of the classification indicates that there is a child alone in the vehicle.

Abstract: A charging door provided with a projection lamp and a method of controlling projection of the same, includes a base, a charging door panel, a connection member, and a projection lamp module, wherein a charging port is formd in the base, and a vehicle is charged through the charging port, the charging door panel is pivotably mounted to the base, the connection member connects the base and the charging door panel with each other, and a mounting hole is formed in the connection member, and the projection lamp module is mounted in the mounting hole of the connection member, and the projection lamp module is electrically connected to a controller to be turned on or off according to a command signal of the controller and to project light of a predetermined color, based on a command signal of the controller.

Abstract: A switch hinge structure used for a charging door or a fuel door of a vehicle includes: a structure housing having an inner wall on which a first boss is disposed; a guide member concentrically installed in the structure housing, and having a groove track on an outer wall thereof; a first spring installed in the structure housing to provide thrust to the guide member in a direction toward an outside of the vehicle; a rotation member installed on an end of the structure housing, having an annular shape, and having a second boss on an interior circumference thereof; and a second spring providing torque to the guide member through the second boss. The first and second bosses are accommodated in the groove track, and guide movement of the guide member when the guide member moves out of the vehicle by an action of the first and second springs.

Abstract: The invention relates to a vehicle interactive system and method, a storage medium, and a vehicle. The vehicle interactive system includes: a data acquisition device configured to acquire first data indicating a user intention; a data processing device configured to obtain the user intention based on the first data; and an execution device configured to control a vehicle based on the user intention, where the first data is data about a user line of sight. According to the solutions in one or more embodiments of the invention, processing of information about a user line of sight is combined with vehicle control, so that a user does not need to control an apparatus on a vehicle by hand or voice, thereby having experience of more natural and convenient human-vehicle interaction.

Abstract: The invention provides a method and device for protecting a child inside a vehicle, a computer device, a computer-readable storage medium, and a vehicle, which are applied to the technical field of automobiles. The method for protecting a child inside a vehicle includes: receiving image data inside a vehicle; performing facial detection on the image data to detect passengers in the vehicle; further classifying the detected passengers in the vehicle into children and adults according to the facial detection; and performing a corresponding protection operation when a result of the classification indicates that there is a child alone in the vehicle.

Abstract: A moisture resistant pad for a liquid crystal panel, including at least one moisture resistant construction including a central region and an edge region disposed around the central region, wherein the edge region includes a first undulation structure disposed around the central region, the first undulation structure being a closed structure for blocking water vapor out of the central region. In the moisture resistant pad for a liquid crystal panel, channels formed within a surface of a product that needs to be moisture resistant are isolated from the external environment so that water vapor in the external environment cannot contact the product surface through the channels. As a result, the pad has good moisture resistance, suitable in transportation environments or in packaging container environments.

Abstract: An electrocardiograph (ECG) signal processing method and apparatus to resolve a problem that relatively severe interference caused during single-arm measurement for single-lead ECG collection seriously affects accuracy of heart rate calculation and cardiac rhythm analysis. The method includes collecting, by a measurement device, an ECG signal, extracting a kth valid QRS complex of the ECG signal, calculating a kth time difference and a (k+1)th time difference, and determining whether the kth time difference and the (k+1)th time difference are target time differences. In this way, accuracy of ECG feature extraction is improved, the interference caused during the single-arm measurement is eliminated to the most extent, and the accuracy of heart rate calculation and cardiac rhythm analysis can be effectively guaranteed.

Abstract: An electrocardiogram waveform signal method includes obtaining a filtered waveform signal, marking the waveform signal as K signal line segments based on monotonicity, extracting line segment data of each signal line segment, and determining a line segment matching template of the waveform signal based on the line segment data of each signal line segment. The extracting of the line segment includes extracting a line segment length Xi and a line segment width Yi of each signal line segment i of the K signal line segments, performing difference extension on the line segment length Xi and the line segment width Yi based on a preset length and a preset width, respectively, to obtain a normalized signal line segment j, and extracting fourth line segment data of the normalized signal line segment j.

Abstract: Provided are a connection structure and system of an integrated brake device for a rail vehicle. The connection structure of an integrated brake device for a rail vehicle includes a brake valve, a dust collector, an intermediate body, an air cylinder, a support assembly and a connection assembly. The intermediate body is of a plate-type structure, the brake valve and the dust collector are mounted on one side of the intermediate body, the air cylinder is connected to the intermediate body by means of the connection assembly, the air cylinder is mounted on the other side of the intermediate body, and the support assembly is located between the air cylinder and the intermediate body. The connection structure of an integrated brake device for a rail vehicle has a simple and compact structure and saves on space.

Abstract: An unmanned aerial vehicle (UAV) includes a fuselage, a power system arranged at the fuselage, and an antenna assembly arranged at the fuselage. The antenna assembly includes an antenna operating in a first frequency band and a second frequency band different from each other, a first parasitic unit configured to change a radiation direction of the antenna in the first frequency band, and a second parasitic unit configured to change a radiation direction of the antenna in the second frequency band.

Abstract: Provided are a connection structure and system of an integrated brake device for a rail vehicle. The connection structure of an integrated brake device for a rail vehicle includes a brake valve, a dust collector, an intermediate body, an air cylinder, a support assembly and a connection assembly. The intermediate body is of a plate-type structure, the brake valve and the dust collector are mounted on one side of the intermediate body, the air cylinder is connected to the intermediate body by means of the connection assembly, the air cylinder is mounted on the other side of the intermediate body, and the support assembly is located between the air cylinder and the intermediate body. The connection structure of an integrated brake device for a rail vehicle has a simple and compact structure and saves on space.

Abstract: A moisture resistant pad for a liquid crystal panel, including at least one moisture resistant construction including a central region and an edge region disposed around the central region, wherein the edge region includes a first undulation structure disposed around the central region, the first undulation structure being a closed structure for blocking water vapor out of the central region. In the moisture resistant pad for a liquid crystal panel, channels formed within a surface of a product that needs to be moisture resistant are isolated from the external environment so that water vapor in the external environment cannot contact the product surface through the channels. As a result, the pad has good moisture resistance, suitable in transportation environments or in packaging container environments.

Abstract: Some embodiments of the present disclosure relate to a sealant and its preparation method, a display panel and a display device. The sealant according to some embodiments of the present disclosure includes a sealant base component and also an amine-modified nanomaterial.

Abstract: A method includes obtaining a filtered waveform signal, marking the waveform signal as K signal line segments based on monotonicity, extracting line segment data of each signal line segment, and determining a line segment matching template of the waveform signal based on the line segment data of each signal line segment, where the line segment matching template includes M consecutive signal line segments, and M is an integer less than K. The method further includes matching each of the K signal line segments with the M signal line segments included in the line segment matching template, and determining a target wave group of the waveform signal based on a matching result of each signal line segment. The method further includes determining periodic signal data of the waveform signal based on line segment data of the target wave group.

Abstract: A cushion structure for use with a packaging case provides cushion and protection of an object. The cushion structure includes a first member and a second member. The first member is configured to snuggly receive the object; the second member is configured to be mounted onto a case body of the packaging case; and the first member and the second member are detachably coupled.

Abstract: A brake cylinder dust cover is installed on a waterproof brake cylinder. The brake cylinder includes a brake cylinder body and a front cover. A waterproof dust cover assembly is arranged on the front cover. The waterproof dust cover assembly includes a dust cover fixedly connected to the front cover, and a filter felt support and a filter felt pad which are arranged in the dust cover. The filter felt support is connected with the dust cover, and the filter felt pad is fixed on the filter felt support. An outwards extending skirt is arranged at the edge of the dust cover in the axial direction thereof.

Abstract: An unmanned aerial vehicle (UAV) includes an antenna assembly configured to communicate with a ground terminal controller, a memory storing antenna assembly configuration information, and one or more processors configured to adjust a radiation direction pattern of the antenna assembly according to the antenna assembly configuration information.

Abstract: An unmanned aerial vehicle (UAV) includes a fuselage, a power system arranged at the fuselage, and an antenna assembly arranged at the fuselage. The antenna assembly includes an antenna operating in a first frequency band and a second frequency band different from each other, a first parasitic unit configured to change a radiation direction of the antenna in the first frequency band, and a second parasitic unit configured to change a radiation direction of the antenna in the second frequency band.