Abstract: Disclosed is a method for determining the sex of yellowtails, the method comprising a step of identifying whether an amino acid residue at position 143 in polypeptide encoded by the HSD17B1 gene of yellowtails is a glutamic acid residue or a glycine residue; a nucleic acid molecule or a primer set which is for use in said method; or a kit comprising the same, for determining the sex of yellowtails. The method according to the present invention is useful in that the genetic sex of yellowtails can be accurately determined.

Abstract: A piston ring includes a plurality of first ring pieces placed inside the ring groove in a stacking manner such that the first ring pieces adhere to each other in the axis direction. The first ring pieces include respective piston ring gap portions each having end surfaces separated from each other in the circumferential direction of the first ring pieces such that the end surfaces face each other via a ring gap having a predetermined dimension. The respective piston ring gap portions of the first ring pieces are displaced from each other in the circumferential direction. A closing member is provided to close the piston ring gap portions of the first ring pieces in the radial direction of the first ring pieces.

Abstract: A gyrocompass includes: a binnacle; a gyro case having a gyro rotor; a vertical ring mounted on the binnacle for rotation about a vertical axis, the vertical axis extending perpendicular to a gimbal axis and a horizontal axis, the gimbal axis extends in a direction of a spin axis of the gyro rotor and the horizontal axis extends perpendicular to the gimbal axis and parallel to a horizontal plane; a horizontal ring supported by the vertical ring for rotation about the gimbal axis and supporting the gyro case for rotation about the horizontal axis or supported by the vertical ring for rotation about the horizontal axis and supporting the gyro case for rotation about the gimbal axis; a horizontal servo motor for rotating the gyro case about the horizontal axis; and an azimuth servo motor mounted on the vertical ring for rotating the vertical ring about the vertical axis.

Abstract: A crankshaft with improved seizure resistance is provided. A crankshaft (10) is a crankshaft including journals (11) and pins (12), having a chemical composition of, in mass %: 0.35 to 0.40 % C; up to 0.70 % Si; 1.00 to 2.00 % Mn; up to 0.50 % Cr; up to 0.050 % Al; up to 0.020 % N; up to 0.020 % P; 0.005 to 0.200 % S; and balance Fe and impurities, each of the journals (11) and pins (12) having a surface microstructure containing tempered martensite in not less than 80 volume % and a surface hardness not higher than HV 450.

Abstract: A piston ring includes a plurality of first ring pieces placed inside the ring groove in a stacking manner such that the first ring pieces adhere to each other in the axis direction. The first ring pieces include respective piston ring gap portions each having end surfaces separated from each other in the circumferential direction of the first ring pieces such that the end surfaces face each other via a ring gap having a predetermined dimension. The respective piston ring gap portions of the first ring pieces are displaced from each other in the circumferential direction. A closing member is provided to close the piston ring gap portions of the first ring pieces in the radial direction of the first ring pieces.

Abstract: A resonator is engaged with an outer circumferential surface of a rim of a wheel so as to be fixed to the outer circumferential surface. The resonator includes a body including an elongated resonant space extending along the outer circumferential surface of the rim and includes an opening arranged at the body to connect, to an outside of the resonant space, at least one of two ends of the resonant space in an extension direction of the resonant space. The resonant space and the opening form a resonance tube.

Abstract: A cost calculation and payment device includes: a main body provided with a placement portion on which the user places merchandise items; a first camera for capturing an image of the merchandise items placed on the placement portion; a second camera for capturing an image of a face of the user; a controller for performing a process related to cost calculation by recognizing the merchandise items in question based on a merchandise item image acquired by image capture by the first camera and to perform a process related to face authentication based on a face image acquired by image capture by the second camera; and a display for displaying a cost calculation result and a payment result acquired by the controller, wherein the display is disposed in a vicinity of the placement portion, and the second camera captures an image of the face of the user looking at the display.

Abstract: A lens device includes a first lens system including a first lens, a second lens system including a second lens, a moving member configured to move in an optical axis direction of the first lens, and a physical structure configured to move the first lens in the optical axis direction and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens.

Abstract: A cost calculation and payment device includes: a main body provided with a placement portion on which merchandise items are placed; a first camera for capturing an image of the merchandise items placed on the placement portion; a second camera for capturing an image of a face of the user; a controller for performing a process related to cost calculation by recognizing the merchandise items in question based on a merchandise item image acquired by the first camera and to perform a process related to face authentication based on a face image acquired by the second camera; a display for displaying a cost calculation result and a payment result acquired by the controller, and a projector for projecting an image onto the placement portion, wherein the display is disposed in a vicinity of the placement portion.

Abstract: A lens device includes a first electric motor, a second electric motor, a lens, a cam ring, a first gear, a second gear, and a controller. The cam ring is configured to drive the lens in a direction of an optical axis of the lens. The first gear is configured to transmit power generated by the first electric motor to the cam ring. The second gear is configured to transmit power generated by the second electric motor to the cam ring. The controller is configured to, when controlling the cam ring to stop rotating, first stop a rotation of the first electric motor and then stop a rotation of the second electric motor.

Abstract: A carrier includes a stator configured to be coupled to a base support, a frame operably coupled to the stator via a plurality of piezoelectric actuators, and at least one inertial sensor attached to the frame. The stator includes a spherical surface. The frame is configured to rotate relative to the stator about one or more rotational axes. Rotation of the frame is effectuated via the plurality of piezoelectric actuators. The inertial sensor is configured to detect a motion of the frame.

Abstract: A lens apparatus includes a barrel configured to accommodate a plurality of lenses, a first ring arranged around the barrel and configured to rotate about an optical axis, a second ring arranged around the first barrel and configured to rotate about the optical axis and move together with the first ring between a first position and a second position in an optical axis direction, a friction member arranged between surfaces of the first and second rings facing each other and configured to generate a frictional force on the second ring to cause the second ring to rotate together with the first ring when the first and second rings are in the first position, and a resistance member configured to generate a resistance force on the second ring to prevent the second ring from rotating together with the first ring when the first and second rings are in the second position.

Abstract: A lens apparatus includes a first barrel, a first ring around the first barrel and configured to rotate about an optical axis, a second barrel arranged in the first barrel and configured to move between first and second positions in an optical axis direction, a cam ring around the first barrel and configured to rotate about the optical axis, a switching ring around the cam ring and configured to rotate about the optical axis together with the cam ring to switch the second barrel between the first and second positions, a rotation restraining member configured to limit a rotation of the first ring to first and second rotation angle ranges when the second barrel is in the first and second positions, respectively, and a circuit configured to control a drive mechanism based on a rotation angle of the first ring with respect to the first barrel.