Abstract: A biometric information acquisition method according to the present disclosure includes an application step and an acquisition step. The application step includes applying an electrical signal to an organism’s muscle. The acquisition step includes acquiring information about the organism’s muscle as biometric information based on a change rate with respect to an impedance of the electrical signal applied in the application step.

Abstract: A power conversion method including: receiving, by a pair of input terminals, an input voltage in which is a single-phase AC voltage; designating a first target voltage ref1, a second target voltage ref2, and a third target voltage ref3 respectively representing consecutive target values of first-phase, second-phase, and third-phase output voltages forming a three-phase AC voltage; and cyclically connecting and disconnecting (i) the input terminals and first output terminals at a duty cycle corresponding to |ref1/in| when an instantaneous value of |in| is greater than an instantaneous value of |ref1|, (ii) the input terminals and second output terminals at a duty cycle corresponding to |ref2/in| when the instantaneous value of |in| is greater than an instantaneous value of |ref2|, and (iii) the input terminals and third output terminals at a duty cycle corresponding to |ref3/in| when the instantaneous value of |in| is greater than an instantaneous value of |ref3|.

Abstract: An efficient and reliable power conversion method for converting an input voltage which is a single-phase AC voltage into output voltages forming a two-phase AC voltage includes: receiving an input voltage; designating, as a first target voltage representing consecutive target values of a first-phase output voltage and a second target voltage representing consecutive target values of a second-phase output voltage, AC voltages forming a two-phase AC voltage and having (i) an amplitude 1/?2 times smaller than an amplitude of the input voltage, and (ii) phase differences of +45 degrees and ?45 degrees relative to the input voltage; and designating a frequency other than a frequency twice a frequency of the input voltage, as a frequency of the first target voltage and the second target voltage.

Abstract: A power conversion method including: receiving, by a pair of input terminals, an input voltage in which is a single-phase AC voltage; designating a first target voltage ref1, a second target voltage ref2, and a third target voltage ref3 respectively representing consecutive target values of first-phase, second-phase, and third-phase output voltages forming a three-phase AC voltage; and cyclically connecting and disconnecting (i) the input terminals and first output terminals at a duty cycle corresponding to |ref1/in| when an instantaneous value of |in| is greater than an instantaneous value of |ref1|, (ii) the input terminals and second output terminals at a duty cycle corresponding to |ref2/in| when the instantaneous value of |in| is greater than an instantaneous value of |ref2|, and (iii) the input terminals and third output terminals at a duty cycle corresponding to |ref3/in| when the instantaneous value of |in| is greater than an instantaneous value of |ref3|.

Abstract: An efficient and reliable power conversion method for converting an input voltage which is a single-phase AC voltage into output voltages forming a two-phase AC voltage includes: receiving an input voltage; designating, as a first target voltage representing consecutive target values of a first-phase output voltage and a second target voltage representing consecutive target values of a second-phase output voltage, AC voltages forming a two-phase AC voltage and having (i) an amplitude 1/?2 times smaller than an amplitude of the input voltage, and (ii) phase differences of +45 degrees and ?45 degrees relative to the input voltage; and designating a frequency other than a frequency twice a frequency of the input voltage, as a frequency of the first target voltage and the second target voltage.

Abstract: A device that supports an operator in checking an operation of an electronic circuit mounted on a board includes the following units. A waveform obtainment unit obtains a measured waveform as a signal waveform of a voltage or current measured by the operator bringing a probe into contact with the board. A similarity calculation unit calculates a similarity between the measured waveform and each of simulated signal waveforms which are signal waveforms of a voltage or current at respective nodes on the electronic circuit and are obtained by simulating the operation of the electronic circuit. A position determination unit determines, based on node information indicating positions of the nodes, a node position on the electronic circuit which corresponds to a simulated signal waveform having a maximum similarity. A notification unit notifies the operator of the node position determined on the electronic circuit.

Abstract: A power conversion method including: receiving an input voltage which is a single-phase AC voltage; designating a first target voltage and a second target voltage respectively representing consecutive target values of a first-phase output voltage and a second-phase output voltage which form a two-phase AC voltage; cyclically connecting and disconnecting a pair of input terminals and a pair of first output terminals at a duty cycle corresponding to a ratio |ref1/in| during a time period in which an instantaneous absolute value of the input voltage is greater than an instantaneous absolute value of the first target voltage; and cyclically connecting and disconnecting the pair of the input terminals and a pair of second output terminals at a duty cycle corresponding to a ratio |ref2/in| during time periods in which the instantaneous absolute value of the input voltage is greater than an instantaneous absolute value of the second target voltage.

Abstract: A gate drive circuit includes: an input port for receiving a control signal; an output port; a capacitor connected to the output port; a modulation unit which generates (i) a first modulated signal indicating timing of a first logical value of the control signal and (ii) a second modulated signal indicating timing of at least a second logical value of the control signal; a first electromagnetic resonance coupler which wirelessly transmits the first modulated signal; a second electromagnetic resonance coupler which wirelessly transmits the second modulated signal; a first rectifier circuit which generates a first demodulated signal by demodulating the first modulated signal, and outputs the first demodulated signal to the output port; and a second rectifier circuit which generates a second demodulated signal by demodulating the second modulated signal, and outputs the second demodulated signal to the output port.

Abstract: A gate drive circuit includes: an input port for receiving a control signal; an output port; a capacitor connected to the output port; a modulation unit which generates (i) a first modulated signal indicating timing of a first logical value of the control signal and (ii) a second modulated signal indicating timing of at least a second logical value of the control signal; a first electromagnetic resonance coupler which wirelessly transmits the first modulated signal; a second electromagnetic resonance coupler which wirelessly transmits the second modulated signal; a first rectifier circuit which generates a first demodulated signal by demodulating the first modulated signal, and outputs the first demodulated signal to the output port; and a second rectifier circuit which generates a second demodulated signal by demodulating the second modulated signal, and outputs the second demodulated signal to the output port.

Abstract: A power conversion method including: receiving an input voltage which is a single-phase AC voltage; designating a first target voltage and a second target voltage respectively representing consecutive target values of a first-phase output voltage and a second-phase output voltage which form a two-phase AC voltage; cyclically connecting and disconnecting a pair of input terminals and a pair of first output terminals at a duty cycle corresponding to a ratio |ref1/in| during a time period in which an instantaneous absolute value of the input voltage is greater than an instantaneous absolute value of the first target voltage; and cyclically connecting and disconnecting the pair of the input terminals and a pair of second output terminals at a duty cycle corresponding to a ratio |ref2/in| during time periods in which the instantaneous absolute value of the input voltage is greater than an instantaneous absolute value of the second target voltage.

Abstract: A device that supports an operator in checking an operation of an electronic circuit mounted on a board includes the following units. A waveform obtainment unit obtains a measured waveform as a signal waveform of a voltage or current measured by the operator bringing a probe into contact with the board. A similarity calculation unit calculates a similarity between the measured waveform and each of simulated signal waveforms which are signal waveforms of a voltage or current at respective nodes on the electronic circuit and are obtained by simulating the operation of the electronic circuit. A position determination unit determines, based on node information indicating positions of the nodes, a node position on the electronic circuit which corresponds to a simulated signal waveform having a maximum similarity. A notification unit notifies the operator of the node position determined on the electronic circuit.

Abstract: To develop a motor which can directly drive a brushless motor using a conventional circuit for an inverter without smoothing circuit and a circuit for a matrix converter that are for a brushed motor that operates on single-phase 100 V. Magnetic cores are attached to a motor shaft to increase inertial force. A magnetic-drive-pulsation motor which modulates torque is realized using force of attraction and repulsion generated by outer magnets and magnetic cores. The magnetic-drive-pulsation motor can be driven using the inverter and the matrix converter on single-phase 100 V power supply.

Abstract: To provide a semiconductor equipment having high heat-transfer effect and breakdown voltage, and a method of manufacturing the same. The semiconductor equipment includes: a sealed container; a stem connected to the sealed container via a stem peripheral portion; and a semiconductor chip mounted on a top surface of the stem, inside the sealed container. The semiconductor chip is electrically connected to a lead provided to the stem, the stem peripheral portion, which is of a material that is different from the material of stem and the same as the material of the sealed container, is bonded along a periphery of the stem, and the sealed container is filled with a working fluid including at least one of ethanol, a perfluorocarbon, and a fluoroether.

Abstract: To develop a motor which can directly drive a brushless motor using a conventional circuit for an inverter without smoothing circuit and a circuit for a matrix converter that are for a brushed motor that operates on single-phase 100 V. Magnetic cores are attached to a motor shaft to increase inertial force. A magnetic-drive-pulsation motor which modulates torque is realized using force of attraction and repulsion generated by outer magnets and magnetic cores. The magnetic-drive-pulsation motor can be driven using the inverter and the matrix converter on single-phase 100 V power supply.

Abstract: To provide a semiconductor equipment having high heat-transfer effect and breakdown voltage, and a method of manufacturing the same. The semiconductor equipment includes: a sealed container; a stem connected to the sealed container via a stem peripheral portion; and a semiconductor chip mounted on a top surface of the stem, inside the sealed container. The semiconductor chip is electrically connected to a lead provided to the stem, the stem peripheral portion, which is of a material that is different from the material of stem and the same as the material of the sealed container, is bonded along a periphery of the stem, and the sealed container is filled with a working fluid including at least one of ethanol, a perfluorocarbon, and a fluoroether.

Abstract: An object of the invention is to provide a semiconductor device which includes a barrier metal having high adhesiveness and diffusion barrier properties and a method of manufacturing the semiconductor device. The invention provides a semiconductor device manufacturing method including forming a first layer made of a material containing silicon on a base substance; forming a second layer containing metal and nitrogen on the first layer; and exposing the second layer to active species obtained from plasma in an atmosphere including reducing gas.

Abstract: An object of the invention is to provide a semiconductor device which includes a barrier metal having high adhesiveness and diffusion barrier properties and a method of manufacturing the semiconductor device. The invention provides a semiconductor device manufacturing method including forming a first layer made of a material containing silicon on a base substance; forming a second layer containing metal and nitrogen on the first layer; and exposing the second layer to active species obtained from plasma in an atmosphere including reducing gas.

Abstract: A server, which transmits phonetic-sound information to a plurality of client machines and reproduces the transmitted phonetic-sound information, includes a storage unit for storing a plurality of pieces of voiced phonetic-sound information whose contents are voices of a plurality of speakers in a conversation made up of the voices of the plurality of speakers. The server also includes a timing determining unit for determining reproduction timing of the plurality of pieces of voiced phonetic-sound information, and a transmitting unit for transmitting the voiced phonetic-sound information which is applicable to each client machine, so that its reproduction is executed in the reproduction timing determined by the timing determining unit.

Abstract: A ballistic semiconductor device of the present invention comprises a n-type emitter layer (102), a base layer (305) made of n-type InGaN, a n-type collector layer (307), an emitter barrier layer (103) interposed between the emitter layer (102) and the base layer (305) and having a band gap larger than that of the base layer (305), and a collector barrier layer (306) interposed between the base layer (305) and the collector layer (307) and having a band gap larger than that of the base layer (305), and operates at 10 GHz or higher.

Abstract: The present invention relates to a semiconductor device having a multi-layered structure comprising an emitter layer, a base layer, and a collector layer, each composed of a group III-V n-type compound semiconductor in this order; a quantum dot barrier layer disposed between the emitter layer and the base layer; a collector electrode, a base electrode and the emitter layer all connected to an emitter electrode; the quantum dot barrier layer having a plurality of quantum dots being sandwiched between first and second barrier layers from the emitter layer side and the base layer side, respectively and each having a portion that is convex to the base layer; a base layer side interface in the second barrier layer, and collector layer side and emitter layer side interfaces in the base layer having curvatures that are convex to the collector layer corresponding to the convex portions of the quantum dots.