Abstract: Disposed are an extrinsic parameter calibration device and method for multiple camera devices, a storage medium and electronic device. The device includes: a plurality of mobile calibration plates, configured to calibrate extrinsic parameters of all camera devices carried on a mobile carrier which is disposed in a set space, wherein each mobile calibration plate is disposed on a slide rail disposed on a wall in the set space; and a control device, configured to control each of the mobile calibration plates to slide along the slide rail corresponding to the mobile calibration plate. In this disclosure, extrinsic parameters of camera devices disposed on mobile carrier are simultaneously calibrated by disposing a plurality of mobile calibration plates in the set space, thereby improving anti-noise and anti-interference capabilities of calibration, having strong robustness, effectively improving calibration efficiency and accuracy of calibration result, and also saving costs and time of calibration.

Abstract: A semiconductor device includes a transistor, a semiconductor layer, an active region and a conductive layer. The active region is in the semiconductor layer. The conductive layer is configured to maintain a channel in the active region when the transistor is triggered to be conducted.

Abstract: Disclosed is a coated rubber particle, preparation thereof and its application as a plugging material in drilling fluids. The coated rubber particle comprises a rubber core and a coating layer, wherein the core has a fluorine content (at %) of 0-15%, the coating layer has a fluorine content (at %) of 30-80%, and the coated rubber particle has a 24-hour oil absorption rate of 4% or less. The coated rubber particle has good oil resistance, and is particularly suitable for use as a plugging material in drilling fluids, particularly oil-based drilling fluids.

Abstract: A method for positioning an internet of things (IoT) device with AR glasses is provided. The method includes: acquiring an indoor map; determining an AR-position of the AR glasses on the indoor map and a viewing direction of the AR glasses based on initial information of the AR glasses; receiving from the AR glasses tracking information concerning the IoT device to be positioned; and determining an IoT-position of the loT device to be positioned from the AR-position and the viewing direction in combination with the tracking information of the AR glasses.

Abstract: The biometric feature verification method includes: extracting a first biometric feature from collected data; sending a second biometric feature to a second end according to the first biometric feature, the second biometric feature being the first biometric feature or being determined according to the first biometric feature; and receiving a result of verification performed by the second end on the second biometric feature by combining a first part of a sample feature and a second part of the sample feature stored in the second end, the first part being stored in the first end or a third end.

Abstract: Provided is a biological feature registration method. The method includes: performing privacy removal process on a first biological feature of a biological sample to obtain a second biological feature, where the second biological feature is a biological sample feature used for performing identity authentication.

Abstract: Disclosed is a device for evaluating damage of fracturing fluid to reservoir and operation method thereof, the device includes a liquid storage tank, a suction tube, a chromatography device, a bracket, a receiving container and a height adjuster; the disclosure has the following beneficial effects: since different liquids pass through the porous medium at different time and speed and the silica gel particles will not expand when immersed in the liquid, a porous structure is formed by placing silica gel particles of different sizes to simulate the pore-throat structure of unconventional oil and gas reservoirs, hence removing the influence of fracturing fluid on the hydration and expansion damage of the reservoir matrix, by testing the time and flow rate of different fracturing fluids flowing through the silica gel pores, the degree of damage caused by fracturing fluids to unconventional oil and gas reservoirs is evaluated.

Abstract: The present invention discloses an integrated research and development system for high-throughput preparation and statistical mapping characterization of materials, comprising: a high-throughput preparation module, a high-throughput characterization module, an automatic control module and a statistical mapping data processing module; the high-throughput preparation module is used for preparing a multi-component combinatorial-sample; the high-throughput characterization module comprises a plurality of different high-throughput characterization devices; the automatic control module comprises a special sample box, a sample moving platform, an intelligent mechanical arm and a synchronous control system; and the statistical mapping data processing module is used for constructing a statistical mapping constitutive model corresponding to position mapping according to the composition, microstructure and performance data of the combinatorial-sample.

Abstract: The present disclosure provides a method and apparatus for obtaining a map of an Internet of things device.

Abstract: Embodiments of the invention are directed to annotating a log based on processing log documentation. Aspects include obtaining the log having a plurality of entries. Aspects also include creating a set of log entry templates by processing the log documentation associated with the log, wherein each log entry template includes one or more constants and one or more variables. Aspects further include annotating each of the plurality of entries based on the set of templates, wherein the annotating includes labeling each value of the one or more variables with a variable name.

Abstract: A message is received, that represents an action to be performed in a service. The message includes a natural language portion and an endpoint to interact with. The natural language portion is parsed to identify the action and the endpoint is interacted with to perform the action.

Abstract: The present technology addresses the problem of quickly and safely improving policies in online reinforcement learning domains. As its solution, an exploration strategy comprising diverse exploration (DE) is employed, which learns and deploys a diverse set of safe policies to explore the environment. DE theory explains why diversity in behavior policies enables effective exploration without sacrificing exploitation. An empirical study shows that an online policy improvement algorithm framework implementing the DE strategy can achieve both fast policy improvement and safe online performance.

Abstract: A portable oral irrigator includes a nozzle, a handle, an outer water container and an inner water container. The nozzle is at an upper end of the portable oral irrigator. The handle is below the nozzle. The outer water container is below the handle. The inner water container is below the outer water container. A sealing ring is at a bottom of the inner water container for sealing the inner water container. An annular silicone sealing member is at a joining portion of the outer water container and the inner water container. A gasket is between the outer water container and the handle. An air passable silicone seal is on the gasket. With provision of the air passable silicone seal, a raised bottom of the air passable silicone seal contracts to close its cross-shaped opening due to water pressure in the outer water container, thereby preventing leakage.

Abstract: A cyclic thioether compound has a structure represented by the following formula (I). A vegetable oil composition contains the cyclic thioether compound. When the cyclic thioether compound is used as a drilling fluid lubricant in a drilling fluid. The lubrication performance of the drilling fluid can be significantly improved.

Abstract: The present disclosure provides a transistor device, a manufacturing method thereof, a display substrate and a display device. The transistor device includes a base substrate, as well as a first transistor and a second transistor that are disposed on the base substrate. The first transistor includes a first active layer. The second transistor includes a second gate. The first active layer and the second gate are disposed in the same layer.

Abstract: A valve piston pump body device of water flosser includes a front bracket shell equipped with a back bracket shell. A pump body is installed at the middle-upper end of the cavity between the front bracket shell and the back bracket shell. A motor is installed at the middle-lower end of the cavity between the front bracket shell and the back bracket shell. The rotating shaft at the upper end of the motor is equipped with motor teeth. A first metal shaft is arranged in the hole of the cavity between the front bracket shell and the back bracket shell. A driving gear is installed on the first metal shaft and the driving gear and the motor teeth are mutually engaged. A one-way valve piston device is used.

Abstract: A semiconductor device includes a transistor, a semiconductor layer, an active region and a conductive layer. The active region is in the semiconductor layer. The conductive layer is configured to maintain a channel in the active region when the transistor is triggered to be conducted.

Abstract: A client computer may split a process into sub-processes, send each sub-processes to a different group of peers in a blockchain network, wherein each group has at least one peer from each essential organization in the blockchain network, receive processed sub-transactions from the peers in the blockchain network, validate each sub-transaction, and validate the transaction based on the validation of all sub-transactions, wherein all sub-transaction must be valid for the transaction to be valid.

Abstract: Embodiments of the invention are directed to annotating a log based on processing log documentation. Aspects include obtaining the data set and obtaining a set of templates, wherein one or more template of the set of templates includes a variable labeled as the data type. Aspects also include annotating the data set based on the set of templates, wherein the annotating includes labeling each value of the variable in the data set with the data type. Aspects further include creating an updated data set by replacing each value of the variable in the data set that is labeled with the data type with a new data value.

Abstract: An example operation may include one or more of receiving a request for executing a trade transaction with a digital token, determining to execute an additional verification on the digital token based on one or more of a newness of the digital token and a lack of data on the digital token, querying a blockchain ledger associated with the digital token for one or more additional data attributes of the digital token, and determining whether or not to execute the trade transaction with the digital token based on the one or more additional data attributes of the digital token queried from the blockchain ledger.