Abstract: A method for calibrating a PCO and a hardware delay of a downlink navigation antenna of an LEO satellite Ls includes: calculating, by using a precise orbit determination and timing result and ground calibrations, a ground calibrated phase center orbit initial value of the downlink navigation antenna and a ground calibrated satellite clock bias initial value; calculating, based on the ground calibrated phase center orbit initial value and the ground calibrated satellite clock bias initial value, a correction amount of the downlink navigation antenna by separating or combining GNSS signals and LEO satellite downlink navigation signals; and correcting, based on the correction amount of the downlink navigation antenna, the PCO of the downlink navigation antenna and the hardware delay of the downlink navigation antenna, so as to realize in-orbit calibration of the PCO of the downlink navigation antenna and the hardware delay of the downlink navigation antenna.

Abstract: The technology described herein is directed towards a design and implementation of a unit cell for a reconfigurable intelligent surface/reflectarray by incorporating reconfigurability within a phase-delay element of the unit cell. Reconfigurability is directly incorporated into the unit cell via a variable length phase delay line element and PCM-based (e.g., mmWave) phase shifter that determines the unit cell's phase shift by changing the length of the phase delay line element. One implementation is directed to a monolithic integration of the element using chalcogenide materials as switch elements with pulsed actuation to switch among different available lengths that determine the length of the phase delay line element, resulting in a significant reduction in power consumption, area saving, and digital reconfigurability.

Abstract: The technology described herein is directed towards a multiband unit cell that is part of a reflective surface that can reflect different specific frequencies of impinging electromagnetic waves. The unit cells can have different phase profiles to facilitate beam steering and/or beam splitting functionality, independently for each specific frequency. The multiband unit cell can be a dual-band unit cell based on a straightforward unit-cell design, e.g., using diagonally arranged ring resonators as sub-cells of a supercell. Alternative design variations are also described to accommodate multi-frequency (greater than two frequency) applications. In one example implementation, the metasurface is constructed as a low-profile dual-band reflective surface with beam-steering and/or beam-splitting capabilities, e.g., utilizing only a single unit cell metal layer above a substrate.

Abstract: An object tracking method, and a terminal device and a computer-readable storage medium using the same are provided. The method includes: obtaining first feature information of a target human body in a first image and a first detection frame of a head area of the target human body; obtaining second feature information of each human object in a second image and a second detection frame of a head area of the human object by performing a first image detection on the second image; and recognizing the target human body from the human object in the second image according to a first similarity between the first feature information and the second feature information and a second similarity between the first detection frame and the second detection frame. The above-mentioned method can effectively improve the accuracy of object matching, thereby enhancing the reliability of the results of multi-object tracking.

Abstract: An object tracking method, and a terminal device and a computer-readable storage medium using the same are provided. The method includes: obtaining a first filtered image by filtering out the moving object in the i-th image frame, where the moving object is an object in the i-th image frame that has a positional change relative to the object in the (i?1)-th image frame, and i is an integer larger than 1; determining, based on the first filtered image, a pixel mapping relationship between the (i?1)-th image frame and the i-th image frame; and tracking, according to the pixel mapping relationship, the moving object. Through the above-mentioned method, the reliability of the trajectory matching results can be improved, thereby improving the reliability of object tracking.

Abstract: A method and an apparatus for training target detection models and an electronic device are provided. The method includes: predicting unlabeled training data through a teacher model and a student model to obtain a first prediction result output by the teacher model and a second prediction result output by the student model; determining a target pseudo-label category to which the first prediction result belongs according to the confidence in the first prediction result; calculating a current pseudo-label loss based on the first prediction result, the second prediction result, and the pseudo-label loss function corresponding to the target pseudo-label category; and updating the student model according to the current pseudo-label loss and updating the teacher model based on the updated student model, and returning to predicting the unlabeled training data through the teacher model and the student model until a preset training end condition is met.

Abstract: The technology described herein is directed towards designing and implementing multibeam metasurfaces, based on deriving the directions of grating lobes within a general rectangular grid structure. The derivation is used to design and implement multibeam metasurfaces. A multibeam metasurface is designed based on the directions of the grating lobes and desired beam splitting angles, which are used to determine unit cell/element grid characteristics of periodicity data and orientation. When deployed, the multibeam metasurface splits an impinging electromagnetic wave/beam in the desired multiple beam splitting directions. In one implementation, the multibeam metasurface is implemented in a single surface.

Abstract: The technology described herein is directed towards metasurfaces arranged with unit cells for narrowband sound absorption, in which the unit cells are based on the principles of Helmholtz resonators. A deeply subwavelength sound absorbing unit-cell is designed and constructed based on a desired resonance frequency. The unit-cell includes a neck portion and air chamber dimensioned to resonate at the desired resonance frequency to inverse phase cancel corresponding narrowband frequencies of incoming sound waves. The unit cells are distributed (e.g., periodically) as part of a metasurface, e.g., positioned proximate to a noise source. As practical examples, the metasurface or multiple metasurfaces can be placed near or wrapped around a computer server or rack of servers to absorb fan noise. The metasurface components (including the unit-cells) can be manufactured using any type of additive manufacturing process such as 3D printing to result in a thin, light-weight, and cost effective noise absorbing metasurface.

Abstract: A reconfigurable intelligent surface is disclosed. The reconfigurable intelligent surface includes unit cells that include banks of capacitors that are integrated into the structure of the surface. The banks of capacitors provide bias isolation and reconfigurable impedance matching. The configurability of the capacitance can impact the reactance and allow for operation over a wider range of frequencies.

Abstract: A reconfigurable intelligent surface is disclosed. The reconfigurable intelligent surface includes unit cells that include a bank of capacitors that is monolithically integrated into the structure of the reconfigurable intelligent surface. The bank of capacitors include a plurality of capacitors that have a high Self-Resonant Frequency (SRF). Each of the capacitors is integrated with a Phase Change Material (PCM) based switch.

Abstract: A method for reducing a memory footprint of data stored in a compressed memory subsystem is described. The method includes selecting a read/write data to store in the compressed memory subsystem. The method also includes searching a first compressed data storage pool of the compressed memory subsystem corresponding to a compressed size of the read/write data to identify a first free data block. The method further includes storing the read/write data in a second free data block from a second compressed data storage pool of the compressed memory subsystem corresponding to a compressed size of the read/write data if the first compressed data storage pool is exhausted.

Abstract: A method to predict and fit an APC of a LEO satellite considering attitude information is provided, which includes: transforming a spacecraft body-fixed coordinate system, obtaining a transformation matrix from orbital coordinate system to transformed spacecraft body-fixed coordinate system, obtaining rotation angles during a rotation process, obtaining rotation angles in orbit determination time period to predict rotation angles in orbit prediction time period, obtaining a transformation matrix from spacecraft body-fixed coordinate system to Earth-fixed coordinate system of each prediction moment, obtaining a correction vector from a CoM to a phase center of a downlink signal antenna in the Earth-fixed coordinate system at each prediction moment, and obtaining an orbit of the phase center of the downlink signal antenna of a LEO satellite, and performing an ephemeris parameter fitting on the orbit of the phase center of the downlink signal antenna of the LEO satellite in a fitting time period.

Abstract: A carbon dioxide injection manager may pump carbon dioxide into a wellbore with a carbon dioxide pump. A carbon dioxide injection manager may measure a carbon dioxide temperature of the carbon dioxide at the wellbore. A carbon dioxide injection manager may, based on the carbon dioxide temperature, increase a temperature of the carbon dioxide between the carbon dioxide pump and the wellbore.

Abstract: An organic light-emitting display panel includes a pixel definition layer including a plurality of pixel openings, a black matrix layer including a plurality of first through holes and a light-shielding portion surrounding the first through holes, a first organic film layer filled at least in the first through holes and allowing for formation of a second through hole in each of the first through holes, an organic planarization layer covering the black matrix layer and the first organic film layer and filled in each of the second through holes, and a color filter layer covering the organic planarization layer, so that a light loss inside the display panel can be reduced, and transmittance can be increased.

Abstract: Described are scaffolds for tissue engineering and method of making and using the scaffold. The method of making can include providing a textile layer formed of a plurality of yarns, wherein the plurality of yarns are formed of interlocking bundles of fibers formed from a first polymer or a first polymer mixture; and forming one or more substrate layer of a second polymer or a second polymer mixture onto the textile layer having a pre-defined thickness.

Abstract: Disclosed herein are impedance-based biosensor systems comprising an impedance-based biosensor having an electrode, a meter in electrical communication with the electrode, a processor in electrical communication with the impedance-based biosensor and the meter, and a memory storing instructions to be executed by the processor. The instructions can cause the impedance-based biosensor system to measure the impedance of the electrode, derive one or more electrical properties of the impedance-based biosensor from the impedance of the electrode, and calculate a viable cell count based on the one or more electrical properties.

Abstract: The present invention provides a microchannel matrix optical waveguide plate, which is formed by stacking two optical element groups perpendicularly. Each of the optical element groups is composed of a plurality of parallel-arranged optical elements. Each of the optical elements includes a glass substrate. The glass substrate is divided into an air surface and a reflecting surface. A first metal film layer, a magnetic material film layer and a second metal film layer are sequentially arranged on the air surface. The present invention uses magnetic material attraction to replace an adhesive to achieve tight fitting of optical elements, thus reducing the influence of the adhesive on reflected light of optical elements. The fabricated microchannel matrix optical waveguide plate has the characteristics of high imaging definition and simple fabrication process.

Abstract: A method for extracting video features may include: obtaining a target video sequence that comprises a number of video frames; performing video frame feature extraction on the target video sequence to obtain video frame features of each of the video frames; performing feature weight calculation on each of the video frame features to obtain the feature weight of each of the video frame features; wherein the feature weight of each of the video frame features is determined by the video frame features of all of the video frames in the target video sequence; and performing feature weighting on each of the video frame features according to the feature weight of each of the video frame features to obtain video features of the target video sequence.

Abstract: A method for extracting video frame features includes: obtaining a number of initial features of each video frame in a video sequence; calculating global channel attention information of the video sequence based on the initial features of each video frame in the video sequence; calculating local channel attention information of a target video frame according to initial features of a target video frame; wherein the target video frame is one of the video frames in the video sequence; and performing channel attention mechanism processing on the initial features of the target video frame according to the global channel attention information and the local channel attention information to obtain optimized features of the target video frame.

Abstract: An airbag assembly includes: an air bag, mounted to a vehicle seat and capable of inflating from an undeployed state to a deployed state, wherein in the deployed state, the air bag extends along the head and torso of an occupant in the vehicle seat, arranged to surround the head and torso of the occupant; and a strap, for mounting the air bag to the vehicle seat and having a first section and a second section, wherein in the deployed state, the strap is tightened, the first section being mounted to the air bag on an outer surface of the air bag in an extension direction of the air bag, and the second section extending on at least one outer side surface of the air bag in a direction at an angle with respect to the extension direction of the air bag.