Abstract: A propulsion system includes a driving device and a propeller coupled with the driving device. The driving device includes a body portion and a lock portion disposed on the body portion. The lock portion includes a first snap-fitting portion. The propeller includes a hub having a receiving hole, a plurality of blades connected to the hub, and a second snap-fitting portion arranged on an inner wall of the receiving hole and configured to snap with the first snap-fitting portion.

Abstract: Hydrofluoroolefin (HFO) fluid can be transported through an electrochemical device, which has a proton exchange membrane (PEM) disposed between a pair of gas-permeable electrodes that include respective catalysts. At an inlet side, the catalyst facilitates reaction of HFO with hydrogen carrier gas. The resulting cation is transported across PEM in the presence of an electric field applied to the electrodes. At an outlet side, the catalyst of the opposing electrode facilitates dissociation of the cation back into HFO and hydrogen. In some embodiments, the transported HFO has a higher pressure than that before the electrochemical device. In some embodiments, the electrochemical device can be operated in reverse to expand HFO fluid and/or to recapture power. The electrochemical device can thus be used as a compressor or expander for vapor-phase HFO or as a pump or expander for liquid-phase HFO, for example, in power generation or heating/cooling cycles.

Abstract: A method of operating a mobile platform includes determining a threshold angle relative to the mobile platform of an imaging device mounted to the mobile platform that avoids obstruction of a field-of-view of the imaging device by one or more components of the mobile platform, and controlling the mobile platform according to the threshold angle.

Abstract: A gimbal photographing method includes obtaining an external signal, processing the external signal to generate one or more gimbal action control instructions and one or more photographing control instructions, controlling a gimbal to perform a corresponding action according to at least one of the one or more gimbal action control instructions, and controlling a camera device to perform photographing according to at least one of the one or more photographing control instructions. The at least one of the one or more photographing control instructions cause the camera device to photograph along with the action performed by the gimbal during at least part of a whole photographing process.

Abstract: A chart for calibrating a system of multiple cameras, the chart comprising: a background; an array of dots contrasting the background, wherein the array of dots are arranged in rows and columns, wherein the array of dots comprise a first dot array, and a second dot array, wherein the first dot array fully occupies a first region of evenly spaced dots with a first dot density, the second dot array fully occupies a second region of evenly spaced dots with a second dot density, and wherein the second region is enclosed within the first region; a group of first markers in the first region, a group of second markers in the second region, and a third marker at the center of the chart, wherein each second marker is closer to the third marker than each first marker.

Abstract: A video processing method includes determining a shooting template that includes background music, one or more gimbal movement trajectories, and one or more shooting elements, sending one or more parameters corresponding to the one or more gimbal movement trajectories to a gimbal to control the gimbal to drive a shooting device to shoot according to the one or more gimbal movement trajectories, obtaining information of at least one video segment, and generating a video file based on the at least one video segment.

Abstract: Functional verification of a new database feature is provided. A set of SQL query seeds are evolved using information contained in a knowledge map that was generated based on a real SQL query workload of an entity corresponding to a database. Real SQL queries are identified in the database that are similar to the evolved set of sample SQL query seeds. A new feature to be implemented in the database is injected into the real SQL queries that are similar to the evolved set of sample SQL query seeds. Multiple runtime access paths are generated for each of the real SQL queries injected with the new feature for output cross validation. Each of the real SQL queries injected with the new feature is run in a test environment using each of the multiple runtime access paths corresponding to a real SQL query injected with the new feature for functional verification.

Abstract: The present disclosure provides a multi-rotor aerial vehicle. The multi-rotor aerial vehicle includes a body, the body including a first side and a second side opposite to each other; a first rotor connected to the first side of the body; and a second rotor connected to the second side of the body, a torque coefficient of the second rotor being different from a torque coefficient of the first rotor. When the multi-rotor aerial vehicle flies in a direction from the second side toward the first side or from the first side toward the second side, the first rotor rotates at a first rotational speed, the second rotor rotates at a second rotational speed, and an absolute value of a difference between the first rotational speed and the second rotational speed is less than a predetermined value.

Abstract: A method for controlling an unmanned aerial vehicle control includes: obtaining sensing information of the unmanned aerial vehicle, wherein the sensing information includes at least one of status information or environment information; obtaining at least one control mode; calling and/or invoking at least one execution device in the at least one control mode; generating a control instruction based on the at least one control mode and a sensing value of the sensing information; sending the control instruction to the at least one execution device; receiving, by the at least one execution device, the control instruction; and performing, by the at least one execution device, a corresponding action based on the control instruction. Intelligent outputting of the execution device may be achieved by intelligently integrating a plurality of sensing assemblies of the unmanned aerial vehicle and obtaining corresponding control modes.

Abstract: An electronic device includes a display screen, a memory storing a plurality of computer instructions and files related to an external device, and a processor. The processor is configured to execute the plurality of computer instructions to implement: monitoring an operation of browsing files in the external device; when the operation is detected, obtaining a first file group stored in the external device and a second file group stored locally and related to the external device; and simultaneously displaying the first file group and the second file group in one interface of the display screen.

Abstract: The present invention discloses a heading generation method of an unmanned aerial vehicle including the following steps of: making a preliminary flight for selecting a point of view to record flight waypoints, the waypoints including positioning data and flight altitude information of the unmanned aerial vehicle; receiving and recording flight waypoints of the unmanned aerial vehicle; generating a flight trajectory according to waypoints of the preliminary flight; editing the flight trajectory to obtain a new flight trajectory; and transmitting the edited new flight trajectory to the unmanned aerial vehicle to cause the unmanned aerial vehicle to fly according to the new flight trajectory. The present invention further relates to a heading generation system of an unmanned aerial vehicle.

Abstract: A photographing apparatus includes a processing circuit configured to obtain video data and a communication circuit configured to send the video data and a processing instruction to a processing apparatus. The processing instruction instructs the processing apparatus to process the video data.

Abstract: The present invention relates to improvements to systems and methods for filtering a data set. An audience filtering system is configured to perform operations that include accessing a database that comprises user profile data associated with a plurality of users, generating a bit-set based on the user profile data from the database, wherein the bit-set comprises an array of binary values, receiving a user input e.g., via a GUI) that defines one or more filter criteria (e.g., a value of a user attribute), filtering the bit-set based on the one or more filter criteria, and identifying a subset of the plurality of users based on the filtered bit-set, according to certain example embodiments.

Abstract: A display device includes a display area configured to display one or more images of a virtual reality (VR) environment or an augmented reality (AR) environment, one or more sensors configured to obtain region-of-interest (ROI) data of a user in response to the user wearing the display device and looking at the one or more images of the VR environment or the AR environment displayed on the display area, and one or more processors. The one or more processors are individually or collectively configured to select one or more ROI zones from a plurality of zones based on the ROI data and effect display of the one or more ROI zones on the display area to the user. The plurality of zones are used to divide the one or more images of the VR environment or the AR environment on the display area.

Abstract: A gimbal photographing method includes obtaining an external signal, processing the external signal to generate one or more gimbal action control instructions and one or more photographing control instructions, controlling a gimbal to perform a corresponding action according to at least one of the one or more gimbal action control instructions, and controlling a camera device to perform photographing according to at least one of the one or more photographing control instructions. The at least one of the one or more photographing control instructions cause the camera device to photograph along with the action performed by the gimbal during at least part of a whole photographing process.

Abstract: The present invention discloses a heading generation method of an unmanned aerial vehicle including the following steps of: making a preliminary flight for selecting a point of view to record flight waypoints, the waypoints including positioning data and flight altitude information of the unmanned aerial vehicle; receiving and recording flight waypoints of the unmanned aerial vehicle; generating a flight trajectory according to waypoints of the preliminary flight; editing the flight trajectory to obtain a new flight trajectory; and transmitting the edited new flight trajectory to the unmanned aerial vehicle to cause the unmanned aerial vehicle to fly according to the new flight trajectory. The present invention further relates to a heading generation system of an unmanned aerial vehicle.

Abstract: The development of air-stable unipolar n-type semiconductors with good solubility in organic solvents at room temperature remains a critical issue in the field of organic electronics. Moreover, most of the existing semiconducting materials exhibit LUMO energy levels higher than ?4.0 eV, making electron transport sensitive to both moisture and oxygen. Bis(2-oxoindolin-3-ylidene)benzodifurandione dicyanide or derivatives thereof are disclosed herein. More specifically, bis(2-oxoindolin-3-ylidene)benzodifurandione dicyanide or derivatives thereof for use in organic electronics are disclosed. A process for the preparation of bis(2-oxoindolin-3-ylidene)benzodifurandione dicyanide and derivatives is also disclosed. The bis(2-oxoindolin-3-ylidene)benzodifurandione dicyanide or derivatives thereof are characterized by high electron mobilities and are suitable for use as n-type semiconductors in organic electronics.

Abstract: An image processing method includes, when an edit triggering event for a target image is detected, acquiring description information associated with the target image. The description information includes interference information that affects image quality occurred in a shooting process of the target image. The description information includes at least one of motion data of a carrying member that carries a shooting module configured to acquire the target image or motion data of a moving object on which the carrying member is mounted. The method further includes editing image clips in the target image which are associated with respective interference information of the description information to obtain a processed target image.

Abstract: The present invention relates to improvements to systems and methods for filtering a data set. An audience filtering system is configured to perform operations that include accessing a database that comprises user profile data associated with a plurality of users, generating a bit-set based on the user profile data from the database, wherein the bit-set comprises an array of binary values, receiving a user input (e.g., via a GUI) that defines one or more filter criteria (e.g., a value of a user attribute), filtering the bit-set based on the one or more filter criteria, and identifying a subset of the plurality of users based on the filtered bit-set, according to certain example embodiments.

Abstract: A gimbal on-board a vehicle includes a receiver and a gimbal control system. The receiver is configured to receive a gimbal mode signal indicative of user selection of a gimbal mode from a plurality of gimbal modes. Each gimbal mode of the plurality of gimbal modes causes one or more axes of the gimbal to be stabilized with respect to an environment of the vehicle. The gimbal control system is configured to receive gimbal control data indicative of an attitude of the gimbal, receive position data of the vehicle indicative of a location or an attitude of the vehicle, and generate simulated gimbal response data indicative of a simulated attitude of the gimbal based on (1) the gimbal mode signal, (2) the gimbal control data, and (3) the position data of the vehicle.