Abstract: A GaN crystal with an angle between the normal line of a main surface and an m-axis of 0 degrees or more and 20 degrees or less is provided, in which the GaN crystal having, on the main surface thereof, a band-shaped dislocation-concentrated region that satisfies at least one requirement selected from the group consisting of (1) to (3) and a GaN wafer with a narrow width of the band-shaped dislocation-concentrated region present on the main surface and contribution to an improvement in the yield of a nitride semiconductor device: (1) a maximum effective width is less than 50 ?m; (2) at least one of a requirement (A) or a requirement (B) is satisfied, where (A) a dislocation density (DY) for a width of 15 ?m from the center is less than 3×107 cm?2, and (B) a dislocation density (DZ) for a width of 50 ?m from the center is less than 2.5×107 cm?2; and (3) a ratio (DZ/DX) of DZ to DX (a dislocation density DX for a width of 5 ?m from the center) is 0.5 or less, and/or DZ/DY is 0.5 or less.

Abstract: An arc detection system includes a first obtainment unit, a second obtainment unit, and a determination unit. The first obtainment unit obtains a measurement result of current flowing in a power line to which power is supplied from a power supply or a measurement result of voltage in the power line. The second obtainment unit obtains operation information about operation of a device connected to the power line. The determination unit determines whether or not an arc fault has occurred in the power line based on the measurement result obtained by the first obtainment unit and the operation information obtained by the second obtainment unit.

Abstract: A projector device includes: a projector supported in a suspended state by a supporting device; a vibration generation device that generates a vibration acting on at least one of the supporting device and the projector; a vibration detection device that detects a vibration of the projector; and a reporting device that compares a detection value detected by the vibration detection device with a reference value and gives a report when a reporting condition is satisfied.

Abstract: A projector includes an image formation apparatus, a projection optical apparatus that projects image light formed by the image formation apparatus, an optical path shifter that shifts the optical path of the image light with respect to a reference position where the image light is projected, a vibration detection sensor that detects vibration that affects the position where the projection optical apparatus projects the image light, and a control section that controls the optical path shifter, and the control section acquires the result of detection performed by the vibration detection sensor, generates a vibration waveform having a phase opposite the phase of the waveform of the vibration based on the acquired detection result, generates a drive waveform that approximates to the vibration waveform having the opposite phase, and drives the optical path shifter based on the generated drive waveform.

Abstract: A projector includes an optical path shifter that shifts the optical path of image light with respect to a reference position where the image light is projected, a vibration detection sensor that detects vibration that affects the position where the image light is projected, and a vibration suppressor that is disposed at either the side of the optical path shifter on which the image light is incident or via which the image light exits and includes an optical member through which the image light passes, and the vibration suppressor swings the optical member based on the result of detection performed by the vibration detection sensor to change the optical path of the image light having entered the optical member in a direction in which the reverse phase of the phase of the vibration is produced.

Abstract: Provided is an n-type GaN crystal, in which a donor impurity contained at the highest concentration is Ge, and which has a room-temperature resistivity of lower than 0.03 ?·cm and a (004) XRD rocking curve FWHM of less than 20 arcsec. The n-type GaN crystal has two main surfaces, each having an area of 3 cm2 or larger. One of the two main surfaces can have a Ga polarity and can be inclined at an angle of 0° to 10° with respect to a (0001) crystal plane. Further, the n-type GaN crystal can have a diameter of 20 mm or larger.

Abstract: A pixel shifting device according to the present disclosure includes a first frame for holding an optical member, a second frame to be coupled to the first frame, a base to be coupled to the second frame, a pair of second oscillation shaft formation parts for coupling the second frame and the base to each other, and a pair of second actuators arranged across the second oscillation axis and for oscillating the second frame. The pair of second oscillation shaft formation parts include a one-side coupling shaft part for coupling the second frame and the base to each other at the actuator holding parts side, and another-side coupling shaft part for coupling the second frame and the base to each other at an opposite side to the actuator holding parts, and the another-side coupling shaft part is lower in rigidity than the one-side coupling shaft part.

Abstract: A pixel shifting device according to the present disclosure includes a first frame which is configured to hold an optical member, and which oscillates around a first oscillation axis, a second frame which is coupled to the first frame, and which oscillates around the second oscillation axis, a base to be coupled to the second frame, a first actuator for oscillating the first frame, a second actuator which is disposed in an area at a side at which the first actuator is disposed in the second frame, and which oscillates the second frame, and a frame reinforcement member which is disposed in an area at a side at which the first actuator and the second actuator are disposed in the second frame, and which has a first surface having contact with a surface of the second frame.

Abstract: A pixel shifting device includes a first frame which holds an optical member, and which oscillates around a first oscillation axis, a second frame oscillating around a second oscillation axis, a base to be coupled to the second frame via a first coupling part, a pair of first oscillation shaft formation parts for coupling the first frame and the second frame, a first actuator for oscillating the first frame, and a second actuator for oscillating the second frame, wherein the second frame and the base have an extending part which extends along the second oscillation axis, and in which the second actuator is disposed, and the pair of first oscillation shaft formation parts have a pair of second coupling parts for coupling the first and second frames, and a pair of beams extending on the second frame respectively from the pair of second coupling parts along the second oscillation axis.

Abstract: Provided is an n-type GaN crystal, in which a donor impurity contained at the highest concentration is Ge, and which has a room-temperature resistivity of lower than 0.03 ?·cm and a (004) XRD rocking curve FWHM of less than 20 arcsec. The n-type GaN crystal has two main surfaces, each having an area of 2 cm2 or larger. One of the two main surfaces can have a Ga polarity and can be inclined at an angle of 0° to 10° with respect to a (0001) crystal plane. Further, the n-type GaN crystal can have a diameter of 20 mm or larger.

Abstract: A cleaning member includes: an elastic contact plate that includes a distal end surface with a corner portion to be brought into contact with a cleaning target surface, which is moved with toner attached thereto, of a cleaning target body; and a support plate bonded to the elastic contact plate from a back surface side of the elastic contact plate to support the elastic contact plate, the support plate being more rigid than the elastic contact plate. The distal end surface of the elastic contact plate projects from a distal end surface of the support plate.

Abstract: A lighting system includes a plurality of lighting devices and a control device. The plurality of lighting devices are installed in a facility. The control device controls the plurality of lighting devices. The control device controls lighting light projected by at least one lighting device, belonging to the plurality of lighting devices, into colored lighting light, of which a color is different from a color white, to give, upon acquiring information about an event in question, a sign depending on the event in question.

Abstract: Provided is a physical quantity sensor attached to an electronic device provided with an actuator. The physical quantity sensor includes: a sensor element configured to output a detection signal corresponding to a physical quantity; and a circuit device configured to output an actuator drive signal for driving the actuator based on the detection signal. The circuit device has a resonance characteristic measurement mode of outputting the actuator drive signal for measuring a resonance characteristic of the electronic device by vibrating the electronic device, and a vibration-damping mode of outputting the actuator drive signal for reducing a vibration of the electronic device based on the resonance characteristic measured in the resonance characteristic measurement mode.

Abstract: An arc detection system includes a first obtainment unit, a second obtainment unit, and a determination unit. The first obtainment unit obtains a measurement result of current flowing in a power line to which power is supplied from a power supply or a measurement result of voltage in the power line. The second obtainment unit obtains quality information about the quality of communication with a device connected to the power line through power line communication with the device via the power line. The determination unit determines whether or not an arc fault has occurred in the power line based on components in a specific frequency band of the measurement result obtained by the first obtainment unit and the quality information obtained by the second obtainment unit.

Abstract: An arc detection system includes a first obtainment unit, a second obtainment unit, and a determination unit. The first obtainment unit obtains a measurement result of current flowing in a power line to which power is supplied from a power supply or a measurement result of voltage in the power line. The second obtainment unit obtains operation information about operation of a device connected to the power line. The determination unit determines whether or not an arc fault has occurred in the power line based on the measurement result obtained by the first obtainment unit and the operation information obtained by the second obtainment unit.

Abstract: A light-source device includes an excitation light source; an optical element having a reflecting surface to reflect first colored light emitted from the excitation light source; and a wavelength conversion unit including a waveform conversion member configured to convert at least a portion of the first colored light reflected by the optical element and incident on the wavelength conversion unit, into second colored light having a wavelength different from a wavelength of the first colored light and emit the second colored light. A point P does not intersect with a light flux Q where the point P is a center of the first colored light on the reflecting surface of the optical element and the light flux Q is a light flux of the first colored light emitted from the wavelength conversion unit.

Abstract: An arc detection system includes a first obtainment unit, a second obtainment unit, and a determination unit. The first obtainment unit obtains a measurement result of current flowing in a power line to which power is supplied from a power supply or a measurement result of voltage in the power line. The second obtainment unit obtains fluctuation information about a fluctuation in a load included in a device connected to the power line. The determination unit determines whether or not an arc fault has occurred in the power line based on components in a specific frequency band of the measurement result obtained by the first obtainment unit and the fluctuation information obtained by the second obtainment unit.

Abstract: A vibration generation device includes: a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; a first induction unit including a magnet, provided at an opposite-side end portion of the pendulum from the rotation axis, and configured to induce swing of the pendulum; and a first driving unit including a coil and configured to apply a driving force to the pendulum. The coil of the first driving unit faces the magnet of the first induction unit in a non-contact manner.

Abstract: A vibration generation device includes: a base configured to transmit vibration to an object; an arm provided at the base swingably around a rotation axis; and at least one driving unit including a magnet, and a coil disposed to face the magnet in a non-contact manner, and configured to swing the arm. One of the magnet and the coil is disposed at a position separated from the rotation axis at the arm. The arm includes a disposition portion provided at a position separated from the rotation axis at the arm, and a weight portion detachably attached to the disposition portion.

Abstract: A frequency detector detects a system frequency from an AC voltage on an AC power line to which a power conditioner performing system interconnection of a distributed power supply is connected. A power converter is configured to inject lead reactive power or delay reactive power into the AC power line. A controller controls reactive power output from the power converter to output the lead reactive power in response to an increase in the system frequency while outputting the delay reactive power in response to a decrease in the system frequency.