Abstract: An internal resistance calculation device is provided with: a voltage obtaining portion that obtains the voltage of a secondary battery; a current obtaining portion that obtains the current of the secondary battery; a switching determination portion that determines the presence or absence of switching between charging and discharging of the secondary battery based on the obtained current; an identification portion that identifies a waiting time based on a boundary frequency range in which the diffusion impedance arising from the process of diffusion of a predetermined ion contributes to the impedance of the secondary battery in the impedance spectrum of the secondary battery; and a resistance calculation portion that calculates the internal resistance of the secondary battery based on the voltage and the current obtained after the identified waiting time in a case where it is determined that switching between charging and discharging of the secondary battery is present.

Abstract: A wheel speed detection device includes a detection element, a base member, and an affixing member. The detection element has a main body, leads, and protruding from the main body. The affixing member affixes the detection element to the base member by pressing the leads and against the base member without pressing the main body against the base member.

Abstract: A harmonic phase standard includes an input connectable with a radio frequency (RF) signal source for receiving an RF signal, an output, a signal path extending between the input and the output for propagating the RF signal from the input to the output, and a logic gate, an amplifier and a nonlinear transmission line (NLTL) arranged along the signal path. The logic gate receives the RF signal and outputs a waveform having sharpened edges relative to the RF signal. The amplifier amplifies the waveform output by the logic gate. The NLTL receives the amplified waveform from the amplifier and is biased to shape the amplified waveform so as to add harmonic content to the amplified waveform.

Abstract: Provided is a monitoring circuit for a system including an LDO regulator. The monitoring circuit includes: a non-saturation detection circuit configured to detect a non-saturation state of an output transistor of the LDO regulator configured to supply a power supply voltage to an MPU; a current detection circuit configured to detect that an output current from the output transistor is equal to or more than a predetermined current value; and a watchdog timer configured to monitor operation of the MPU. The watchdog timer is enabled when the output transistor is not in a non-saturation state and an output current from the output transistor is equal to or more than a predetermined current value.

Abstract: A concomitant impedance protection method for a half-wavelength power transmission line includes that: three-phase currents and three-phase voltages of a relay protection device mounting position at an M side and a relay protection device mounting position at an N side of the half-wavelength power transmission line are acquired respectively; it is judged whether starting amounts of an M side and an N side meet starting conditions or not; a failure point F is determined according to a time difference when the starting amounts of the M side and the N side meet the starting conditions; and a relay protection action of the half-wavelength power transmission line is started according to concomitant impedance of the half-wavelength power transmission line.

Abstract: A cesium optical pump detector for buried and abandoned chemical weapons of Japan is provided, comprising a pumping light generation module, a first optical module, a magnetic resonance module, a photoelectric detection module, and a signal processing module. The signal processing module includes an amplifying and filtering unit, a self-oscillation unit, a measuring unit, and a calculating unit connected in sequence. The amplifying and filtering unit comprises a first band-pass filter configured to coarsely measure a frequency of the electrical signal and a second band-pass filter configured to finely measure the frequency of the electrical signal. The self-oscillation unit comprises a first phase shifter connected to the first band-pass filter and a second phase shifter connected to the second band-pass filter. In the present disclosure, the intensity of a magnetic field detected can be finely measured, so that the ACWs can be found efficiently and accurately.

Abstract: A testing apparatus for imposing a traveling wave signal on an electric system signal for testing a fault detector is disclosed herein. The fault detector may be configured to simulate a fault at a particular location by controlling the timing of the traveling wave signal. The testing apparatus may be configured to impose multiple traveling wave signals to test the accuracy of the fault location determined by the fault detector. The testing apparatus may be configured to determine the calculation accuracy of the fault detector. The testing apparatus may impose a traveling wave signal on a signal simulating an electrical signal on an electric power delivery system. The testing apparatus may be used to test capabilities of a fault detector of detecting a fault using traveling waves or incremental quantities.

Abstract: A testing system for imposing a traveling wave signal on an electric power system signal for testing a fault detector is disclosed herein. The testing system may be configured to simulate a fault at a simulated location by controlling the timing of the traveling wave signal. The testing system may be configured to impose multiple traveling wave signals to test the accuracy of the fault location determined by the fault detector. The testing system may be configured with multiple testing apparatuses using time coordination and referenced to an intended fault instant. The testing system may be configured to supply traveling waves of different polarities to test for different fault type detection.

Abstract: Described herein is a method of inspecting a part for defects. The method includes applying an electromagnetic field to the part using a defect detection coil and one or more noise cancelation coils. The method also includes detecting feedback received in response to applying the electromagnetic field. The method includes adjusting settings corresponding to the one or more noise cancelation coils, in response to the feedback, to reduce electromagnetic noise.

Abstract: An arc detector includes a current sensor, a power spectrum conversion unit that converts an output from the current sensor to a power spectrum, a section value obtaining unit that divides an arc measurement section for the power spectrum into a plurality of regions, and obtains, from region values for the plurality of regions excluding a maximum one of the region values, a region value to be a section value of the arc measurement section, and an arc determination unit that determines a presence of an arc by comparing the section value with a threshold.

Abstract: A measurement circuit measures a waveform of electrical energy generated by a generator. The measurement circuit includes a sensor configured to sense a waveform having a first range of amplitudes, first and second circuits configured to filter the sensed waveform. Each circuit includes an attenuator configured to amplify an amplitude of the waveform by multiplying the waveform by an attenuation factor, an analog-to-digital converter (ADC) configured to digitally sample the amplified waveform, which has a second range of amplitudes, to obtain digital samples, a gain element configured to multiply the digital samples by a gain factor, and a factor adjustor configured to adjust the attenuation factor and the gain factor. The measurement circuit further includes a controller configured to calculate voltage and current of the waveform based on the digital samples and to control the generator based on the calculated voltage and current. The first range includes and is larger than the second range.

Abstract: A system for monitoring cell-substrate impedance of excitable cells and monitoring the beating cycle of cardiomyocytes, the system including: a device for monitoring cell-substrate impedance at 20 millisecond time resolution, the device having one or more wells on a nonconductive substrate, wherein at least one well of the one or more wells comprises an electrode array fabricated on the substrate for measurement of cell-substrate impedance at 20 millisecond time resolution; an impedance analyzer that measures cell-substrate impedance from the at least one well at 20 millisecond time resolution; electronic circuitry that electrically connects the electrode array from the at least one well to the impedance analyzer; and a software program that analyzes the measured cell-substrate impedance.

Abstract: As applied to the field of touch control technology, a capacitance sensing circuit for sensing a detection capacitor of a detecting circuit, includes: a capacitance judging circuit coupled to the detecting circuit for judging the capacitance of the detection capacitor according to the output signal; and an input signal generator coupled to the detecting circuit for generating the input signal according to noise. The input signal generator includes: a phase detection unit for receiving the noise and detecting a first phase of the noise; a phase calculation unit coupled to the phase detection unit for receiving the noise and the first phase and calculating an optimum phase according to the noise and the first phase; and a first waveform generator coupled to the phase calculation unit for generating the input signal according to the optimum phase.

Abstract: A lead-acid battery has a plurality of individual cells and a plurality of measurement circuits which are mounted on the respective individual cells in a manner integrated in the lead-acid battery. Each measurement circuit is designed to measure a respective individual cell voltage. A method is provided for measuring individual cell voltages of the lead-acid battery having the plurality of measurement circuits integrated in the battery and arranged on the individual cells. In the method, the respective individual cell voltages are measured using the measurement circuits.

Abstract: An apparatus and method for identifying physical security risks to power transmission structures and other associated assets of a power transmission system is disclosed. The apparatus includes a sensor having a sensor assembly; and a floating electrode electrically connected to the sensor and positioned adjacent to the asset being monitored. The floating electrode assumes a space potential created around the asset and provides a voltage signal to the sensor indicative of a voltage of the space potential. When an object approaches the asset, the space potential is impacted and the voltage signal changes to indicate the presence of the object.

Abstract: The disclosed embodiments include systems and methods for multi-frequency focusing signal processing in wellbore logging. In one embodiment, the method includes obtaining a harmonic frequency set to evaluate a resistivity of a formation at a wellbore location, where the harmonic frequency set includes at least one harmonic frequency of a fundamental frequency. The method also includes selecting a waveform from a library of waveforms based on the obtained harmonic frequency set, where the library of waveforms includes a plurality of waveforms having different frequency spectrums. The selected waveform corresponds to a predicted conductivity of the formation. The method further includes generating, based on the selected waveform, a binary waveform for use in evaluating the resistivity of the formation at the wellbore location.

Abstract: Systems and methods for calibrating a conducted electrical weapon (“CEW”) to provide a predetermined amount of current for each pulse of the stimulus signal. Providing the predetermined amount of current, close thereto, increases the effectiveness of the stimulus signal in impeding locomotion of a human or animal target. The calibration process enables a CEW to calibrate the amount of charge in a pulse of the stimulus signal in the environmental conditions where the tester operates and also in the field where the environmental conditions may be different from the environmental conditions during calibration.

Abstract: Systems and methods for calibrating a conducted electrical weapon (“CEW”) to provide a predetermined amount of current for each pulse of the stimulus signal. Providing the predetermined amount of current, close thereto, increases the effectiveness of the stimulus signal in impeding locomotion of a human or animal target. The calibration process enables a CEW to calibrate the amount of charge in a pulse of the stimulus signal in the environmental conditions where the tester operates and also in the field where the environmental conditions may be different from the environmental conditions during calibration.

Abstract: A partial discharge measurement device includes: an impulse voltage application unit; a measurement control unit; and first and second partial discharge detection unit. The measurement control unit includes: a first and a second detector level partial discharge counting unit; and a partial discharge resistance evaluation unit. Each of the first and the second detector level partial discharge counting units outputs a first or second detection signal when the first or second detection signal exceeds a predetermined specified value. The partial discharge resistance evaluation unit counts the number of occurrences of partial discharge based on an output from the first and second detector level partial discharge counting unit, and regards the impulse voltage value at which the count value has reached a predetermined value as a partial discharge inception voltage under the repeated impulse voltage application.

Abstract: A coaxial probe structure, comprising: a support member, comprising a first connecting member; a connector, comprising a second connecting member; a coaxial probe, connecting with a connecting end of the coaxial probe to a bottom of the connector, and extending downwards from the bottom of the connector to a probe tip, and an included angle formed at a junction of the probe tip and the connecting end; and an elastic body connecting the support member with the junction of the connecting end and the probe tip of the coaxial probe.