Abstract: The present invention relates to a method of manufacturing lithium hydroxide, which includes adding at least one acid selected from hydrochloric acid, sulfuric acid, and nitric acid into lithium phosphate slurry including a lithium phosphate particle, adding an alkali material to the lithium phosphate slurry including the acid, and converting it into a lithium hydroxide aqueous solution.

Abstract: The present invention relates to a method of manufacturing lithium hydroxide, which includes adding at least one acid selected from hydrochloric acid, sulfuric acid, and nitric acid into lithium phosphate slurry including a lithium phosphate particle, adding an alkali material to the lithium phosphate slurry including the acid, and converting it into a lithium hydroxide aqueous solution.

Abstract: Provided is an earthen wallpaper which can promote ventilation, filter purification, control of temperature or humidity, emission of far infrared rays, etc., through its micropores, which color can be changed according to contained components with anti-bacteria, deodorization, increase of radiated energy, etc., and which can make work of wallpapering easy. The one earthen wallpaper comprises a first material in 60-95 wt % selected from the group of natural mineral powders of 200-1000 mesh consisting of ocher, ocher ceramic, talcum, jade, purple jade, white earth, zeolite, elvan stone, and a mixture of two or more thereof, and 5-40 wt % of a second material (2) including a bonding agent.

Abstract: The present invention provides a bio-sheet material, and a method and an apparatus of manufacturing the bio-sheet, which has pliability or easiness of cutting by unifying a mixture of at least one of healthful natural minerals or plants such as ocher, jade, tourmalin, etc., using fiber material, paper, etc., as a medium, which can be maintained in an original shape at natural or heat drying without generating separation of the mixture, and which can shorten the manufacturing time.

Abstract: The present invention provides a bio-sheet material, and a method and an apparatus of manufacturing the bio-sheet, which has pliability or easiness of cutting by unifying a mixture of at least one of healthful natural minerals or plants such as ocher, jade, tourmalin, etc., using fiber material, paper, etc., as a medium, which can be maintained in an original shape at natural or heat drying without generating separation of the mixture, and which can shorten the manufacturing time.

Abstract: A disk usable with a hard disk drive includes a first texture recessively formed in a surface of a substrate of the disk and textured in a first pattern of a first net shape to have a first cross angle where line patterns of the first pattern cross each other, and a second texture formed on the surface of the disk substrate independently of the first texture and textured in a second pattern of a second net shape to have a second cross angle where second line patterns of the second pattern cross each other, the second cross angle being relatively smaller than the first cross angle. The first and second textures of the disk also have first and second surface roughness created by grooves in the first and second patterns.

Abstract: The present invention provides a bio-sheet material, and a method and an apparatus of manufacturing the bio-sheet, which has pliability or easiness of cutting by unifying a mixture of at least one of healthful natural minerals or plants such as ocher, jade, tourmalin, etc., using fiber material, paper, etc., as a medium, which can be maintained in an original shape at natural or heat drying without generating separation of the mixture, and which can shorten the manufacturing time.

Abstract: A data recording disk, and a hard disk drive provided with the data recording disk, the data recording disk including a clamping zone and a data zone, wherein at least a portion of a surface of the clamping zone varies in height from a surface of the data zone.

Abstract: The present invention provides a bio-sheet material, and a method and a apparatus of manufacturing the bio-sheet, which has pliability or easincss of cutting by unifying a mixture of at least one healthful natural minerals or plants such as ocher, jade, tourmalin, etc., using fiber material, paper, etc., as a medium, which can be maintained in an original shape at natural or heat drying without generating separation of the mixture, and which can shorten the manufacturing time.

Abstract: Disclosed is a microwave oven comprising a power supply part supplying a commercial alternating current (AC) power, a rectifying and filtering part rectifying and filtering the commercial AC power, a high voltage transformer generating a high voltage by means of direct current (DC) power from the rectifying and filtering part; and a magnetron generating electromagnetic waves based on the high voltage from the high voltage transformer, further comprising a control signal generator part generating a control signal; an inverter part converting the DC power from the rectifying and filtering part into a high voltage AC power based on the control signal from the control signal generator part, and a control part blocking the control signal converted through the inverter part from being applied to the magnetron if the converted control signal is not within a predetermined range.