Abstract: A method for determining a consistency coefficient of a power-law cement grout includes: determining a water-cement ratio of the power-law cement grout; according to engineering practice requirements, determining a time required to determine the consistency coefficient of the power-law cement grout; and obtaining the consistency coefficient of the power-law cement grout. The method is accurate and reliable, requires less calculation, etc.; and has very high practical value and popularization value in environmental protection and ecological restoration.

Abstract: The present disclosure provide a device, method and storage medium for frequency calibration for voltage-controlled oscillators. The device includes: A frequency divider connected with a VCO, a time-digital converter connected with the frequency divider, a logic controller connected with the time-digital converter, a digital-to-analog converter connected with the voltage-controlled oscillator; The frequency divider is used to divide the signal generated by the voltage-controlled oscillator into N times to get the frequency divider signal; Time-digital converter is used to measure the actual time period of frequency division signal; And the logic controller is used to generate the control voltage according to the difference between the actual time period of the frequency division signal and the calibration period of the frequency division signal, and adjust the frequency of the VCO according to the control voltage.

Abstract: A method for determining a three-dimensional tortuosity of a loose and broken rock-soil mass, includes the following steps: a particle grading curve of the loose and broken rock-soil mass is obtained by utilizing a particle size analysis, and followed by calculating an equivalent particle size and an average particle size; a porosity of the loose and broken rock-soil mass is obtained by utilizing a moisture content test, a density test, and a specific gravity test; the three-dimensional tortuosity of the loose and broken rock-soil mass is obtained by utilizing the equivalent particle size, the average particle size and the porosity of the loose and broken rock-soil mass. The method has the advantages of simple logic, accuracy and reliability, simple and fast parameter determination, and has high practical value and promotion value in the field of environmental protection and ecological restoration technology.

Abstract: A signal processing method and device are disclosed. The method include: receiving a first signal; processing the first signal to obtain a squared complex envelope of the first signal; obtaining a second signal by processing the squared complex envelope of the first signal using a first filter, where a cutoff frequency of the first filter is determined according to an average-to-peak power ratio of a squared complex envelope spectrum of a third signal, the third signal is obtained by processing the first signal using a second filter, and a cutoff frequency of the second filter is determined according to a bandwidth occupied by the first signal; determining a squared complex envelope spectrum of the second signal; and determining a symbol rate corresponding to the first signal according to the squared complex envelope spectrum of the second signal. As such, the symbol rate of the signal can be determined accurately.

Abstract: An electronic device, including a transceiver for sending and receiving data packets via a wireless link with a reference node of a wireless network; a processor; a storage device storing instructions that, when executed by the processor, cause the processor to perform: performing timestamp packet exchanging between the electronic device and the reference node successively for a certain number of rounds; obtaining a set of time values corresponding to each round; transforming all sets of time values corresponding to the plurality of rounds into one or more low-rank matrices; applying a Matrix-Completion-Based formulation to the one or more low-rank matrices to obtain a recovered matrix; calculating clock parameters and transmission delay associated with the wireless link based on the recovered matrix; and synchronizing the electronic device with respect to the reference node based on the clock parameters and the transmission delay.

Abstract: Based on real-time measurement data, disclosed is a data-driven beam tracking solution for a mobile Millimeter Wave (mmWave) communication system. A disclosed data driving method is based on a dynamically linearized representation of a time-varying pseudo-gradient parameter estimation process. In the disclosure, an effective codebook design method is introduced, so that beam tracking may further be accelerated with a low overhead by beam rotation.

Abstract: The present disclosure provide a device, method and storage medium for frequency calibration for voltage-controlled oscillators. The device includes: A frequency divider connected with a VCO, a time-digital converter connected with the frequency divider, a logic controller connected with the time-digital converter, a digital-to-analog converter connected with the voltage-controlled oscillator; The frequency divider is used to divide the signal generated by the voltage-controlled oscillator into N times to get the frequency divider signal; Time-digital converter is used to measure the actual time period of frequency division signal; And the logic controller is used to generate the control voltage according to the difference between the actual time period of the frequency division signal and the calibration period of the frequency division signal, and adjust the frequency of the VCO according to the control voltage.

Abstract: In order to reduce energy loss of a tapped linear driver, it is proposed an LED lighting circuit, comprising an input (Vbus, GND) adapted to receive an input voltage, a plurality of LED segments (LED1, LED2, LED3, LED) connected in series and to the input, a buffer component (C9) connected to an anode and a cathode of a series string of at least two of the plurality of LED segments with respective switches, a current source circuit (B1) in series connection with a parallel connection of the buffer component (C9) and the at least two LED segments, across the input; further comprising a further buffer component (C5) across the current source circuit (B1), wherein said buffer component (C9) and the further buffer component (C5) is in series connection.

Abstract: A LED lighting circuit has a plurality of LED segments connected in series. A switching arrangement is used to selectively bypass at least one LED segment to implement a tapped linear driver approach. Degrading of a component in the LED lighting circuit is detected, so that a first TLD current modulation scheme is implemented when no such degrading is detected whereas a second current modulation scheme, different from the first current modulation scheme, is implemented to compensate for said degrading. Said degrading is leading to an increase in a turning on voltage of one LED segment, and compared to said first current modulation scheme, said second current modulation scheme has a higher voltage threshold at which said LED segment is switched. In this way, protection may be provided for circuit components and the light output may be maintained at the desired level in the event of component degrading, such as LED chip failure or contact resistance changes.

Abstract: Based on real-time measurement data, disclosed is a data-driven beam tracking solution for a mobile Millimeter Wave (mmWave) communication system. A disclosed data driving method is based on a dynamically linearized representation of a time-varying pseudo-gradient parameter estimation process. In the disclosure, an effective codebook design method is introduced, so that beam tracking may further be accelerated with a low overhead by beam rotation.

Abstract: In order to reduce energy loss of a tapped linear driver, it is proposed an LED lighting circuit, comprising an input (Vbus, GND) adapted to receive an input voltage, a plurality of LED segments (LED1, LED2, LED3, LED) connected in series and to the input, a buffer component (C9) connected to an anode and a cathode of a series string of at least two of the plurality of LED segments with respective switches, a current source circuit (B1) in series connection with a parallel connection of the buffer component and the at least two LED segments, across the input; further comprising a further buffer component (C5) across the current source circuit (B1), wherein said buffer component (C9) and the further buffer component (C5) is in series connection.

Abstract: A LED lighting circuit has a plurality of LED segments connected in series. A switching arrangement is used to selectively bypass at least one LED segment to implement a tapped linear driver approach. Degrading of a component in the LED lighting circuit is detected, so that a first TLD current modulation scheme is implemented when no such degrading is detected whereas a second current modulation scheme, different from the first current modulation scheme, is implemented to compensate for said degrading. Said degrading is leading to an increase in a turning on voltage of one LED segment, and compared to said first current modulation scheme, said second current modulation scheme has a higher voltage threshold at which said LED segment is switched. In this way, protection may be provided for circuit components and the light output may be maintained at the desired level in the event of component degrading, such as LED chip failure or contact resistance changes.

Abstract: A lighting driver is for receiving an alternating current power supply from a fluorescent lighting ballast. A shunt device is provided for selectively shunting the power supply to implement dimming control. A detector is provided for generating a detection signal and for providing the detection signal to the control circuit to operate the shunt device. The detector has a detection circuit for analyzing a voltage at the driver input and generating 5 the detection signal accordingly, when the voltage is detected. In addition, for situations where the voltage detection does not correctly generate the detection signal, a correction circuit generates the detection signal for a time delay from the end of operating the shunt device. This prevents control stability problems at low dimming levels.

Abstract: A plurality of component models in a multi-layer composite model are trained using historical production data of a production equipment set. Current production data is input to the composite model; and an adjustment value of a factor is obtained and provided to a piece of equipment. The historical production data includes values of a plurality of factors related to an operating condition within a period of time. An output and input factor of each component model are factors with a parent-child relationship among the plurality of factors. The output factor is a production efficiency index of the production equipment set. In two adjacent layers of the composite model, the output factor of a first layer is the input factor of one or more component models of a second layer. The adjustment value is a value of one or more factors making a predicted value satisfy a condition.

Abstract: A computing system and a method are provided for determining a network traffic routing path through a service function chain (SFC). A joint network slicing and traffic engineering problem is provided that may be solved to identify network slicing configuration and traffic engineering parameters to provide a set of function nodes, the SFC, and the network traffic routing path from the source node to the destination node. The joint network slicing and traffic engineering problem P may be solved by minimizing a resource objective associated with the joint network slicing and traffic engineering problem, in accordance with a set of one or more constraints. Instructions may be transmitted to a network orchestrator to create the service function chain in a network slice on the set of network nodes in accordance with the identified network slicing configuration and traffic engineering parameters, to provide the network traffic routing path.

Abstract: There is proposed an interface circuit for connecting an electronic ballast to a lighting arrangement, in which control of a coupling configuration of the interface circuit is dependent upon a frequency of the electronic ballast. In particular, a coupling configuration of the interface circuit is controlled by a control arrangement based on the ballast frequency.

Abstract: A retrofit lamp is to be used with a ballast. A shunt switch is provided in parallel with an output load and is adapted to shunt input terminals of the lamp using pulse width control so as to tune the current through the lighting element. This current control is used to enable compatibility with different ballasts and to provide dimming control. A detection circuit is used to detect an abnormal drive condition of the retrofit lamp and the pulse width control of the shunt switch can then be overridden by holding the shunt switch at a stable state for a certain duration. This prevents overload conditions and avoids DC signals in the event of component failures.

Abstract: A lighting driver is for receiving an alternating current power supply from a fluorescent lighting ballast. A shunt device is provided for selectively shunting the power supply to implement dimming control. A detector is provided for generating a detection signal and for providing the detection signal to the control circuit to operate the shunt device. The detector has a detection circuit for analyzing a voltage at the driver input and generating 5 the detection signal accordingly, when the voltage is detected. In addition, for situations where the voltage detection does not correctly generate the detection signal, a correction circuit generates the detection signal for a time delay from the end of operating the shunt device. This prevents control stability problems at low dimming levels.

Abstract: A retrofit Light Emitting Diode, LED, tube for connecting to a High Frequency, HF, ballast, which LED tube comprises a switchable capacitor arrangement for ensuring that the ballast does not go into over current protection mode, wherein the switching is controlled based on a desired dimming level of the LED tube. The switchable capacitor arrangement is provided in parallel with said input of said rectifier, and comprises at least a first capacitor and a second capacitor in series, and said control circuit is adapted to configure said switchable capacitor arrangement to conduct the AC power and switch at least one of the first capacitor and the second capacitor between the rectifier and the LED array to block the DC power to said LED array.

Abstract: A phase change memory apparatus comprises at least one heating layer; and at least one phase change layer comprising a vanadium dioxide layer, wherein each of the at least one phase change layer is set corresponding to each of the at least one heating layer, the at least one heating layer is configured to heat the at least one phase change layer.