Abstract: The present disclosure provides a sample extraction device, which includes a plurality of chambers arranged on a pedestal. The chamber includes a plurality of first chambers and two mixing chambers. The pedestal is internally provided with a first passage for communicating the two mixing chambers, and a sample extraction chamber is arranged in the first passage. The pedestal is further internally provided with a second passage for transfer and export of a liquid, and connection or disconnection between the two mixing chambers and the second passage is controlled by a valve. Sample extraction processes of the above technical solutions are carried out in a fully enclosed device, avoiding contamination of samples and extraction reagents by external environments, and avoiding environmental contamination caused by aerosols generated during the sample extraction processes. The sample extraction device is particularly suitable for extraction of highly pathogenic samples.

Abstract: An image processing method includes performing, using images obtained from one or more sensors onboard a vehicle, a 2-dimensional (2D) feature extraction; performing, a 3-dimensional (3D) feature extraction on the images; detecting objects in the images by fusing detection results from the 2D feature extraction and the 3D feature extraction.

Abstract: A method of processing point cloud information includes converting points in a point cloud obtained from a lidar sensor into a voxel grid, generating, from the voxel grid, sparse voxel features by applying a multi-layer perceptron and one or more max pooling layers that reduce dimension of input data; applying a cascade of an encoder that performs a N-stage sparse-to-dense feature operation, a global context pooling (GCP) module, and an M-stage decoder that performs a dense-to-sparse feature generation operation. The GCP module bridges an output of a last stage of the N-stages with an input of a first stage of the M-stages, where N and M are positive integers. The GCP module comprises a multi-scale feature extractor; and performing one or more perception operations on an output of the M-stage decoder and/or an output of the GCP module.

Abstract: A metal screw cap (1), a pop-top can and a metal screw cap (1) manufacturing method. The metal screw cap (1) includes a screw cap body (10), where an inner wall of the screw cap body (10) encloses a channel for liquid to flow out; the screw cap body (10) includes a threaded portion (11), an arc-shaped portion (12) and an hemming portion (13); the arc-shaped portion (12) includes a plurality of circular arc-shaped segments connected end to end; the threaded portion (11) is used for threaded sealing connection with a lid, and the hemming portion (13) is used for seaming with a turned edge of a can body. The pop-top can includes the can body and the metal screw cap (1). The metal screw cap (1) manufacturing method is used for manufacturing the metal screw cap (1).

Abstract: Systems and methods described herein retrieve data from a data store, the data comprising marketing data associated with a plurality of advertising channels disposed in a plurality of geographic units. The systems and methods pre-process the data to derive a pre-processed data set, and hierarchically cluster the pre-processed data set. The systems and methods further derive a reduced multicollinearity data set having one or more clusters based on the hierarchically clustering by reducing a distance metric among geographic units of the plurality of geographic units that are disposed inside the one or more clusters, and analyze the one or more clusters with a model to generate one or more visualizations used to increase an impression impact, increase a carryover, or a combination thereof, in at least one of the plurality of advertising channels.

Abstract: Apparatus and techniques for an integrated circuit (IC) package to automatically detect, through an input/out pin, external component parameters and parasitics. An example IC package generally includes a pin for coupling to a component external to the IC package, and at least one of a resistance detector, an inductance detector, or a capacitance detector coupled to the pin, and configured to detect at least one of a resistance, an inductance, or a capacitance, respectively, of a lumped parameter model for the component external to the IC package. The resistance detector, inductance detector, or capacitance detector may also be configured to detect parasitics associated with at least one of the component, the pin, or a connection between the component and the pin.

Abstract: Disclosed are a VCD vector compression method and device based on circuit toggle behaviors. The method comprises: converting a VCD format file into a current matrix model, wherein three dimensions of the current matrix model are one time dimension and two spatial dimensions; performing preliminary screening based on an overall toggle feature: dividing the current matrix into several time segments in accordance with an equal interval in the time dimension, and performing screening according to the overall toggle feature, and forming a preliminary screened current distribution matrix by the screened time segments; performing fine screening based on region toggle features: performing further screening according to local toggle features, and forming a fine screened current distribution matrix by the screened time segments; and re-outputting the fine screened current distribution matrix as a VCD format file after vector compression.

Abstract: Disclosed are a VCD vector compression method and device based on circuit toggle behaviors. The method comprises: converting a VCD format file into a current matrix model, wherein three dimensions of the current matrix model are one time dimension and two spatial dimensions; performing preliminary screening based on an overall toggle feature: dividing the current matrix into several time segments in accordance with an equal interval in the time dimension, and performing screening according to the overall toggle feature, and forming a preliminary screened current distribution matrix by the screened time segments; performing fine screening based on region toggle features: performing further screening according to local toggle features, and forming a fine screened current distribution matrix by the screened time segments; and re-outputting the fine screened current distribution matrix as a VCD format file after vector compression.

Abstract: The present invention discloses an isolation forest (IF)-based modular multilevel converter (MMC) open-circuit (OC) fault diagnosis method, including the following steps: sampling capacitor voltages of submodules (SM), constructing an isolation tree (IT) according to capacitor voltage data, and calculating a depth of each SM in the IT; and forming an IF based on the ITs, calculating average depths of the SMs in the IF, taking an SM with the minimum average depth as an output of the IT, and finally locating a faulty SM by an output buffer to realize accurate location of the faulty SM. Only capacitor voltages of SMs are involved, and no extra hardware resources are required. System parameters are not involved, construction of a system mathematical model and manual setting of an empirical threshold are not required, and the robustness is high.

Abstract: A coil assembly, an electronic device, and a wireless charger. The coil assembly includes a first coil winding, a second coil winding, and a circuit board. The second coil winding is stacked with the first coil winding. A plurality of first terminals and a plurality of second terminals are disposed on the circuit board. Each first terminal is connected to each second terminal by using a cable. In a plurality of cables used to connect the plurality of first terminals and the plurality of second terminals, at least two cables are changed to different line layers in a cross region through first vias to be disposed in a crossed manner.

Abstract: A metal screw cap (1), a pop-top can and a metal screw cap (1) manufacturing method. The metal screw cap (1) includes a screw cap body (10), where an inner wall of the screw cap body (10) encloses a channel for liquid to flow out; the screw cap body (10) includes a threaded portion (11), an arc-shaped portion (12) and an hemming portion (13); the arc-shaped portion (12) includes a plurality of circular arc-shaped segments connected end to end; the threaded portion (11) is used for threaded sealing connection with a lid, and the hemming portion (13) is used for seaming with a turned edge of a can body. The pop-top can includes the can body and the metal screw cap (1). The metal screw cap (1) manufacturing method is used for manufacturing the metal screw cap (1).

Abstract: A battery and an electronic device are disclosed. The battery includes: a first bare cell portion and a second bare cell portion. The first bare cell portion has a first surface and a side surface connected to the first surface, the first surface is configured to face towards a same direction as that of an opening of a battery compartment of an electronic device when the battery is installed in the battery compartment, and the side face is configured to face towards an inner side surface of the battery compartment of the electronic device when the battery is installed in the battery compartment. The second bare cell portion is located on a side that the first surface faces, and an orthographic projection of the second bare cell portion on the first surface overlaps the first surface.

Abstract: A battery and an electronic device are disclosed, which relate to the field of electronic device technologies, so that the battery has different characteristics to meet use requirements for the battery in different application scenarios. Specifically, the battery includes a first cell and a second cell, and the first cell is different from the second cell. The battery provided in embodiments of this application is configured to provide power for the electronic device.

Abstract: The present disclosure relates to a system, method and non-transitory computer readable medium for reverse image searching. The system includes a storage device storing a set of instructions; and one or more processors in communication with the storage device. When executing the set of instructions, the one or more processors: obtain a target part of reference image features of a reference image; obtain a target part of target image features of a target image; determine, based on the target part of the reference image features and the target part of the target image features, whether the target image is similar to the reference image; and mark, upon a determination that the target image is similar to the reference image, the target image as a similar image of the reference image.

Abstract: A parallel control method and a parallel control system for single-phase inverters and an inverter. Acquiring an output voltage and an output current of each of the single-phase inverters; transforming a voltage and a current in static abc coordinates into dq coordinates by reconstruction and coordinate transformation so as to realize decoupling of the voltage and the current; transforming an output voltage command value of a current loop in dq coordinates into abc coordinates by coordinate transformation; and modulating and generating modulation waves according to an output voltage command value in abc coordinates to control a switching of a power device.

Abstract: A parallel control method and a parallel control system for single-phase inverters and an inverter. Acquiring an output voltage and an output current of each of the single- phase inverters; transforming a voltage and a current in static abc coordinates into dq coordinates by reconstruction and coordinate transformation so as to realize decoupling of the voltage and the current; transforming an output voltage command value of a current loop in dq coordinates into abc coordinates by coordinate transformation; and modulating and generating modulation waves according to an output voltage command value in abc coordinates to control a switching of a power device.

Abstract: Provided are a method for directly preparing expanded graphite or graphene under normal temperature and normal pressure, a graphene material, and a product. The method comprises the following specific steps: firstly dispersing graphite in an acidic medium containing an oxidizing agent, and then enabling obtained suspension liquid to stand under normal temperature and normal pressure, thus obtaining expanded graphite. The method does not involve any high-temperature high-pressure reaction process, is safe in operation, low in energy consumption and high in efficiency, and is environmentally-friendly. Obtained expanded graphite can realize 50-1500 times of volume expansion, and an sp2 hybridization structure of a graphene sheet layer is basically not damaged; and the obtained expanded graphite can be widely applied to the fields of energy storage, heat management, photoelectronic devices, solar cells, anti-corrosive materials, various composite materials, and the like.

Abstract: An online system maintains a plurality of content items. The online system selects and provides content items to users of the online system in response to impression opportunities to provide content items to users. A plurality of segments of the impression opportunities are determined. Each segment categorizes the impression opportunities. A relationship between a value metric and computing resources used in the selection process are determined for each segment. Each relationship provides a rate of increase of the value metric given an increase in computing resources used. An allocation of computing resources used per impression opportunity for each of segment is determined based on the rates. A plurality of impression opportunities are identified. In response, one or more content items are selected for each impression opportunity using computing resources according to the determined allocation for the segment to which each impression opportunity belongs.

Abstract: The present disclosure relates to a system, method and non-transitory computer readable medium for reverse image searching. The system includes a storage device storing a set of instructions; and one or more processors in communication with the storage device. When executing the set of instructions, the one or more processors: obtain a target part of reference image features of a reference image; obtain a target part of target image features of a target image; determine, based on the target part of the reference image features and the target part of the target image features, whether the target image is similar to the reference image; and mark, upon a determination that the target image is similar to the reference image, the target image as a similar image of the reference image.