Abstract: An adjustable airless tire with a piston system includes a fluid container connecting with a plurality of spoke structure of pistons to transfer a load of a vehicle from a ground contact surface of a tire to whole walls of the tire. A sensor detects a tension of the tire and a variation of the tension during driving. A control component adjusts the tension of the tire according the load of the vehicle and the road conditions to improve its fuel efficiency, comfortability, controllability and safety. A rim of a wheel keeps an appropriate distance from the tire to limit the maximal level of downward movement of the supporting rods, and support the load of the vehicle if the tire is overload or the piston system lose their function. A transversely curved tire forms closed space between the tire and the rim of the wheel to prevent sticking of foreign objects between them.

Abstract: An adjustable airless tire with an air sac within a wheel includes an air sac located within a wheel to transfer a load of a vehicle from a ground contacting area of a tire to whole walls of the tire through a plurality of spoke structure of rods that connect with the walls of the air sac and the tire. A sensor detects a tension of the tire and a variation of a tension during driving. A control component adjusts the tension of the tire according the load of the vehicle and road conditions to improve its fuel efficiency, comfortability, controllability and safety. A rim of the wheel keeps an appropriate distance from the tire to limit the maximal level of upward movement of the rods. A transversely curved tire mounted to the rim of the wheel to form closed space between the tire and the wheel.

Abstract: A work chair includes a base frame including a transverse portion, a longitudinal portion vertically located on the transverse portion and a plurality of rollers provided at a bottom side thereof, a first pivoting frame pivotally connected to the transverse portion and biasable between a horizontal position and a vertical position, a second pivoting frame including a bottom support portion and a top support portion. The top support portion has one end thereof pivotally connected to the longitudinal portion of the base frame such that the second pivoting frame can be biased to move the top support portion from a vertical position to a horizontal position where the second pivoting frame is placed across the first pivoting frame.

Abstract: A dual-purpose work chair includes a base frame including a transverse portion, a longitudinal portion vertically located on the transverse portion and a plurality of rollers provided at the bottom side thereof, a first pivoting frame pivotally connected to the transverse portion and protruding beyond the base frame and biasable between a horizontal position and a vertical position, a lower seat cushion located on the first pivoting frame, a second pivoting frame pivotally connected to the longitudinal portion and biasable from a vertical position to a horizontal position across the first pivoting frame, and an upper seat cushion located on the second pivoting frame.

Abstract: A work chair includes a base frame including a transverse portion, a longitudinal portion vertically located on the transverse portion and a plurality of rollers provided at a bottom side thereof, a first pivoting frame pivotally connected to the transverse portion and biasable between a horizontal position and a vertical position, a second pivoting frame including a bottom support portion and a top support portion. The top support portion has one end thereof pivotally connected to the longitudinal portion of the base frame such that the second pivoting frame can be biased to move the top support portion from a vertical position to a horizontal position where the second pivoting frame is placed across the first pivoting frame.

Abstract: A dual-purpose work chair includes a base frame including a transverse portion, a longitudinal portion vertically located on the transverse portion and a plurality of rollers provided at the bottom side thereof, a first pivoting frame pivotally connected to the transverse portion and protruding beyond the base frame and biasable between a horizontal position and a vertical position, a lower seat cushion located on the first pivoting frame, a second pivoting frame pivotally connected to the longitudinal portion and biasable from a vertical position to a horizontal position across the first pivoting frame, and an upper seat cushion located on the second pivoting frame.

Abstract: During transmission, a speed of sound pulses gradually reduces due to acoustic impedance. Regulating a length or a density or a sound speed of the sound pulses affects their average speed in the transmitting medium, sound intensity and detecting depth. Time of flight (TOF) and TOF shift can be used to calculate the depth and moving speed of detecting objects. Calculating a speed of moving objects by simultaneously detecting TOF shift at same site from two separated piezoelectric (PZT) elements improves the testing results with accuracy, simplification and reproducibility. Coding sound pulses to obtained the TOF and the TOF shift will simultaneously calculate the depth and the moving speed of sampling points, which can be used to construct 2D and 3D images for these motionless and/or moving sampling points. Coded sound pulses also improves the quality of the imaging.

Abstract: An exercise biased weight includes a weight body defining a center of mass and a through offset bore formed at the weight body at a position offset to the center of mass thereof, wherein a diameter of the offset bore is slightly larger than a diameter of a weight bar member for enabling the weight bar member to slidably pass through the offset bore so as to retain the weight body at the weight bar member. Therefore, the weight body is lifted to generate a downward weight force to against an unwanted shaking movement of the weight body.

Abstract: A work chair includes a chair body, a plurality of wheel sets mounted at the bottom side of the chair body, a seat cushion mounted at the top side of the peripheral wall of the chair body, two guide rails mounted at the chair body at one lateral side each defining a longitudinal sliding slot and locating notch in communication with the sliding slot, a tray, a pivot bolt pivotally connecting the tray to the sliding slots of the rail for allowing the tray to be moved along the sliding slots of the guide rails and having an engagement portion for selectively engaging in one locating notch of each guide rail to hold the tray positively at the selected elevational position for carrying tools.

Abstract: A mechanic's chair with a movable tray includes a support and a seat pad disposed on the support. The tray is disposed below the seat pad and can be pulled to move and engageably fixed in place such that the distance by which the tray is pulled depends on a user's need for accessing the tray for a tool, and the tray is moved and fixed in place efficiently by an engagement mechanism composed of a lever disposed beside the tray and rails disposed on the support.

Abstract: During transmission, a speed of ultrasound pulses gradually reduces due to their energy loss from acoustic impedance. A thickness and a density of piezoelectric (PZT) elements and a sound speed in the PZT elements decides energy of the ultrasound pulses and their detecting depth. A speed of moving objects and an angle of the moving objects with the ultrasound pulses may change a speed of reflected ultrasound pulses and affect their time of flight (TOF) and TOF shift. A method of Coding ultrasound pulses combines advantages of a continuous wave ultrasound and a pulsed wave ultrasound. So, it can be used to obtained the TOF and the TOF shift and calculate the depth and the moving speed of the detecting objects, which also avoids a problem of an aliasing for highly moving speed of the objects.

Abstract: A work chair includes a chair body, a plurality of wheel sets mounted at the bottom side of the chair body, a seat cushion mounted at the top side of the peripheral wall of the chair body, two guide rails mounted at the chair body at one lateral side each defining a longitudinal sliding slot and locating notch in communication with the sliding slot, a tray, a pivot bolt pivotally connecting the tray to the sliding slots of the rail for allowing the tray to be moved along the sliding slots of the guide rails and having an engagement portion for selectively engaging in one locating notch of each guide rail to hold the tray positively at the selected elevational position for carrying tools.

Abstract: A reference spiral is written on a recording surface of a hard disk drive. By launching writing of fine guide spirals from a launch point that is disposed on a pre-existing coarse guide spiral, writing of the fine guide spiral can be launched in response to a write head crossing the pre-existing coarse guide spiral, rather than in response to a precisely timed event. To enable launch points being disposed on pre-existing coarse guide spirals, launch points are not all located at the same radial position on the recording surface.

Abstract: During transmission, a speed of sound pulses gradually reduces due to acoustic impedance. Regulating a length or a density or a sound speed of the sound pulses affects their average speed in the transmitting medium, sound intensity and detecting depth. Time of flight (TOF) and TOF shift can be used to calculate the depth and moving speed of detecting objects. Calculating a speed of moving objects by simultaneously detecting TOF shift at same site from two separated piezoelectric (PZT) elements improves the testing results with accuracy, simplification and reproducibility. Coding sound pulses to obtained the TOF and the TOF shift will simultaneously calculate the depth and the moving speed of sampling points, which can be used to construct 2D and 3D images for these motionless and/or moving sampling points. Coded sound pulses also improves the quality of the imaging.

Abstract: A work stool includes a support whose one end has a cushion and an opposite end has a base. The base has a bottom provided with a plurality of casters. The support has a gas strut. A tray is mounted around the support and positioned between the cushion and the base. A connecting assembly has one end fixedly connected to the tray and has an opposite end connected to the gas strut so that a distance between the tray and the cushion is fixed and the tray is adjustable in terms of altitude by operating the gas strut.

Abstract: An exercise biased weight includes a weight body defining a center of mass and a through offset bore formed at the weight body at a position offset to the center of mass thereof, wherein a diameter of the offset bore is slightly larger than a diameter of a weight bar member for enabling the weight bar member to slidably pass through the offset bore so as to retain the weight body at the weight bar member. Therefore, the weight body is lifted to generate a downward weight force to against an unwanted shaking movement of the weight body.

Abstract: A mechanic's chair with a movable tray includes a support and a seat pad disposed on the support. The tray is disposed below the seat pad and can be pulled to move and engageably fixed in place such that the distance by which the tray is pulled depends on a user's need for accessing the tray for a tool, and the tray is moved and fixed in place efficiently by an engagement mechanism composed of a lever disposed beside the tray and rails disposed on the support.

Abstract: An exercise biased weight includes a weight body defining a center of mass and a through offset bore formed at the weight body at a position offset to the center of mass thereof, wherein a diameter of the offset bore is slightly larger than a diameter of a weight bar member for enabling the weight bar member to slidably pass through the offset bore so as to retain the weight body at the weight bar member. Therefore, the weight body is lifted to generate a downward weight force to against an unwanted shaking movement of the weight body.

Abstract: A work stool includes a support whose one end has a cushion and an opposite end has a base. The base has a bottom provided with a plurality of casters. The support has a gas strut. A tray is mounted around the support and positioned between the cushion and the base. A connecting assembly has one end fixedly connected to the tray and has an opposite end connected to the gas strut so that a distance between the tray and the cushion is fixed and the tray is adjustable in terms of altitude by operating the gas strut.

Abstract: A reference spiral is written on a recording surface of a hard disk drive. By launching writing of fine guide spirals from a launch point that is disposed on a pre-existing coarse guide spiral, writing of the fine guide spiral can be launched in response to a write head crossing the pre-existing coarse guide spiral, rather than in response to a precisely timed event. To enable launch points being disposed on pre-existing coarse guide spirals, launch points are not all located at the same radial position on the recording surface.