Abstract: A cable detection robot and a working method thereof, wherein the cable detection robot includes: a first main body, a second main body, and a rotatable mechanism. The first main body and the second main body each include a support, a driving apparatus, and a holding apparatus; the driving apparatus includes a first wheel and a driving motor, to drive the first wheel to move along a cable through the driving motor; the holding apparatus is symmetrically arranged on two sides of the support, each side includes a first servo motor, connecting to a supporting wheel group; the supporting wheel group is perpendicular to a surface of the cable, the holding apparatus holds or is separated from the cable through rotation of the first servo motor, and relative positions of the first main body and the second main body are adjusted through the rotatable mechanism to implement obstacle surmounting.

Abstract: A device for generating a radio frequency (RF) beam includes an array of independent unit cells. Each unit cell includes RF sources configured to generate terahertz (THz) signals, and antennas coupled to the RF sources for transmitting THz waves based on the THz signals. The device further includes switches configured to selectively bias each unit cell between an activated state in which the antennas of the unit cell are operable to transmit the THz waves, and a deactivated state in which the antennas of the unit cell are prevented from transmitting the THz waves. The device further includes circuitry configured to control the switches to generate the RF beam based on the THz waves transmitted by the antennas of each unit cell in the activated state.

Abstract: Systems and methods for image processing are provided. The systems may include obtaining an initial image relating to a blood vessel. The system may include determining a centerline of the blood vessel based on the initial image. The system may also include determining one or more images to be segmented of the blood vessel based on the centerline and the initial image. The system may also include determining a boundary of the lumen of the blood vessel and a boundary of the wall of the blood vessel in the each image for each of the one or more images. The system may further include analyzing the blood vessel based on the one or more boundaries of the lumen and the one or more boundaries of the wall.

Abstract: Apparatus, systems, and methods for a transmitter array for enhanced communication systems may be provided. According to an aspect a transmitter array may be provided. The transmitter array may include a plurality of equivalent transmitter units. Each equivalent transmitter unit may include an antenna and a QPSK modulator. Each equivalent transmitter unit may be selectively activatable. In some embodiments, upon activation of a set of equivalent transmitter units selected from the plurality of equivalent transmitter units, a desired modulated output signal is generated. According to another aspect, a method of generating a desired modulated output signal may be provided. The method may include receiving a plurality of local oscillator (LO) signals at a transmitter array. The method may further include selectively activating a set of equivalent transmitter units of the plurality of equivalent transmitter units to generate the desired modulated output signal.

Abstract: The present application provides devices and methods for wireless power harvesting (WPH) and backscattering communications. A self-adaptive backscattering device is described which comprises an antenna for receiving and transmitting radio frequency (RF) signals, a non-linear element coupled to the antenna, and a switch for operably coupling the non-linear element to a WPH load. When the switch is on, the non-linear element is connected to the WPH load for harvesting RF signals incident on the antenna to direct current (DC) energy in a WPH mode; when the switch is off, the device switches from the WPH mode to a harmonic backscattering (HB) mode for transmitting harmonic backscattered RF signals through the antenna, and the switch self-adaptively switches between on and off based on harvested DC energy. The described embodiments can be a compact solution suitable for wireless communications in the internet of things (IoT) and wireless sensor network (WSN).

Abstract: The disclosure relates to storing blockchain blocks committed to a blockchain based on a committee selection protocol executed in the presence of majority-sized coalitions while achieving a meaningful fairness guarantee in a small number of rounds, and whose round complexity is less than log log n, and storing a new block to the blockchain based on a protocol executed by the nodes of the next committee.

Abstract: Systems and methods for image processing are provided. The systems may include obtaining an initial image relating to a blood vessel. The system may include determining a centerline of the blood vessel based on the initial image. The system may also include determining one or more images to be segmented of the blood vessel based on the centerline and the initial image. The system may also include determining a boundary of the lumen of the blood vessel and a boundary of the wall of the blood vessel in the each image for each of the one or more images. The system may further include analyzing the blood vessel based on the one or more boundaries of the lumen and the one or more boundaries of the wall.

Abstract: A resonator and a method therefor. The resonator includes a substrate; a bottom electrode; a piezoelectric layer, a surface of the piezoelectric layer being provided with a recessed frame; a barrier layer, the barrier layer and the piezoelectric layer being partially spaced to form an air gap region; a shunt metal layer, along a thickness direction of the resonator, projection profiles of the recessed frame and the air gap region being both located within a projection profile of the shunt metal layer; and a top electrode, a protruding frame being provided at a surface of the top electrode, and a projection profile of the protruding frame being located at an edge of the resonance region. The resonator and the method therefor provide greater flexibility in frequency tuning while catering to the needs of different bandwidths; and also improve the quality factor Q value of the resonator.

Abstract: The present disclosure provides modules, arrays and methods for interferometric transmitters for dual-band and dual-polarization signal modulation where the module has a plurality of oscillators for generating a plurality of carrier signals of a plurality of frequency bands, and a multiport network connected to the plurality of oscillators. The multiport network having a plurality of inputs each for receiving one of the plurality of carrier signals, a plurality of outputs, and a plurality of reflection paths between the plurality of inputs and the plurality of outputs. Each of the plurality of reflection paths has a variable reflection coefficient for modulating the plurality of carrier signals to output a plurality of modulated radio-frequency (RF) signals of the plurality of frequency bands via the plurality of outputs.

Abstract: The present disclosure provides modules, arrays and methods for interferometric receivers for dual-band and dual-polarization signal modulation where the module comprises a plurality of oscillators for generating a plurality of carrier signals of a plurality of frequency bands, and a multiport circuit connected to the plurality of oscillators. The multiport circuit having a plurality of inputs each for receiving one of the plurality of carrier signals, a plurality of outputs, a plurality of quadrature hybrid couplers, power dividers, and power detectors.

Abstract: Aspects of the present disclosure provide a waveguide assembly that employs a non-radiative dielectric waveguide at a bend and a dielectric waveguide away from the bend. By implementing a non-radiative dielectric wave guide at the bend and a dielectric waveguide away from the bend the power dissipated during propagation can be minimized without necessitating an increase in the size of the system. A method of manufacture of the waveguide assembly is also provided.

Abstract: A module has an input port, an output port, and a first and a second conductive path arranged in parallel and connecting the input port and the output port, the first path having a first pulse compressor, and the second path having a second pulse compressor and a delay element. The module is suitable for generating a Gaussian doublet pulse, where the first pulse compressor is for providing rise-time compression, the second pulse compressor is for providing fall-time compression, and the delay element is adjustable. The module may further have a pulse-forming network for transforming the Gaussian doublet pulse to a monocycle doublet pulse. Each of the first pulse compressor, the second pulse compressor and the delay network may be non-linear transmission lines.

Abstract: Apparatus, systems, and methods for a transmitter array for enhanced communication systems may be provided. According to an aspect a transmitter array may be provided. The transmitter array may include a plurality of equivalent transmitter units. Each equivalent transmitter unit may include an antenna and a QPSK modulator. Each equivalent transmitter unit may be selectively activatable. In some embodiments, upon activation of a set of equivalent transmitter units selected from the plurality of equivalent transmitter units, a desired modulated output signal is generated. According to another aspect, a method of generating a desired modulated output signal may be provided. The method may include receiving a plurality of local oscillator (LO) signals at a transmitter array. The method may further include selectively activating a set of equivalent transmitter units of the plurality of equivalent transmitter units to generate the desired modulated output signal.

Abstract: Methods and apparatus for wireless communication using a matrix of reconfigurable cells is provided. Each cell has an antenna or antenna port and is reconfigurable to operate as a transmitter, receiver, angle-of-arrival detector or power harvester. Cells can be allocated to different tasks as needed. A reference frequency signal is distributed to each cell, with an in-phase version of the signal being delivered to a first subset of cells, and a quadrature version of the signal being delivered to a second subset of cells. The first and second subsets may be interleaved for example in a checkerboard pattern. Cells cooperate in pairs for transmission or reception of quadrature amplitude modulated signals. Groups of four cells may cooperate for angle of arrival detection. The cells may be configured as interferometric transmitter/receiver cells using 90 degree hybrid couplers and power detectors.

Abstract: A film bulk acoustic resonator, including: a substrate; an acoustic reflection structure; a bottom electrode; a piezoelectric film; a top electrode; and a raised frame. A spatial region formed by overlapping of the acoustic reflection structure, the bottom electrode, and the piezoelectric film and the top electrode in a thickness direction of the film bulk acoustic resonator is a resonance region, in which the raised frame is arranged, and openings are formed at a side of the raised frame away from the top electrode. The film bulk acoustic resonator can reduce the area ratio of the raised frame in the resonance region and the intensity of the parasitic resonance peak introduced by the raised frame without reducing the Q value of the resonator and without increasing manufacturing process steps.

Abstract: Methods and apparatus for wireless communication using a matrix of reconfigurable cells is provided. Each cell has an antenna or antenna port and is reconfigurable to operate as a transmitter, receiver, angle-of-arrival detector or power harvester. Cells can be allocated to different tasks as needed. A reference frequency signal is distributed to each cell, with an in-phase version of the signal being delivered to a first subset of cells, and a quadrature version of the signal being delivered to a second subset of cells. The first and second subsets may be interleaved for example in a checkerboard pattern. Cells cooperate in pairs for transmission or reception of quadrature amplitude modulated signals. Groups of four cells may cooperate for angle of arrival detection. The cells may be configured as interferometric transmitter/receiver cells using 90 degree hybrid couplers and power detectors.

Abstract: An interferometric receiver includes first and second antennas, each antenna being for receiving modulated microwave and terahertz signals; a first power detector for receiving a reference microwave signal and the modulated microwave signal received at the first antenna, a second power detector for receiving a phase-shifted reference microwave signal and the modulated microwave signal received at the second antenna, a third power detector for receiving a reference terahertz signal and the modulated terahertz signal received at the second antenna, and a fourth power detector for receiving a phase-shifted reference terahertz signal and the modulated terahertz signal received at the first antenna, each power detector being configured to down-convert the modulated microwave or terahertz signal received at the power detector; and circuitry configured to determine a quadrature component and an in-phase component of each of the down-converted microwave signal and the modulated terahertz signal.

Abstract: A module for modulation and demodulation using two substantially identical self-oscillating mixers (SOMs) injection-locked at a coupling frequency, providing a simple compact, low power, highly efficient receiver, transmitter or transceiver. The module suitable for quadrature amplitude-modulation where the coupling frequency is the second harmonic frequency of the SOMs and the SOMs oscillate 180 degrees out of phase relative to one another. Use of carrier frequencies at a fundamental harmonic frequency or odd multiples thereof provide high isolation between the SOMs at the carrier frequency. A method for modulation and demodulation includes injection-locking the two SOMs at a coupling frequency.

Abstract: A device includes one or more controllers and multiple spatially distributed receivers. Each receiver is controllable by the one or more controllers between an activated state in which the receiver is operable to detect an incoming signal, and a deactivated state in which the receiver is not operable to detect the incoming signal. At least a first receiver and a second receiver of the receivers, each in the activated state, are configured to demodulate the incoming signal by: demodulating with the first receiver an in-phase component of the incoming signal; and demodulating with the second receiver a quadrature component of the incoming signal.

Abstract: A device for generating a radio frequency (RF) beam includes an array of independent unit cells. Each unit cell includes RF sources configured to generate terahertz (THz) signals, and antennas coupled to the RF sources for transmitting THz waves based on the THz signals. The device further includes switches configured to selectively bias each unit cell between an activated state in which the antennas of the unit cell are operable to transmit the THz waves, and a deactivated state in which the antennas of the unit cell are prevented from transmitting the THz waves. The device further includes circuitry configured to control the switches to generate the RF beam based on the THz waves transmitted by the antennas of each unit cell in the activated state.