Abstract: Provided are: a microbubble generation device utilizing a swirling flow generated by injecting of a pressurized liquid; a microbubble generation method capable of generating a large amount of bubbles; and a shower apparatus and an oil-water separation apparatus having said microbubble generation device. This microbubble generation device comprises: a cylindrical or conical cylinder with a gas-liquid swirling chamber therein; a gas-liquid discharge inlet provided on one end of the cylindrical or conical cylinder; and a liquid supply cylinder and a gas supply cylinder for introducing a liquid and a gas into the gas-liquid swirling chamber.

Abstract: A new method for generating micro-nano bubbles that uses water hammering, a bubble generating nozzle, and an apparatus for generating micro-nano bubbles are provided to construct a system. The system is for generating micro-nano bubbles in a large amount using only pure water, which does not include any nucleating agents, and for performing not only a clean washing and sterilization but also the generation of uncontaminated micro-nano bubbles. The method defined in the present invention uses water hammering power produced by a mutual collision of jets of dissolved-gas-including solution squirted from two or more spouts.

Abstract: A coil component has a core including a winding core extending in a predetermined direction, and a winding wrapped around the winding core in two or more layers. A first winding portion at one end in the predetermined direction in an (n+1)'th layer of the winding, where n is a natural number, is positioned over a space between second and third winding portions in an n'th layer, the second and third winding portions being adjacently spaced in the predetermined direction.

Abstract: A new method for generating micro-nano bubbles that uses water hammering, a bubble generating nozzle, and an apparatus for generating micro-nano bubbles are provided to construct a system. The system is for generating micro-nano bubbles in a large amount using only pure water, which does not include any nucleating agents, and for performing not only a clean washing and sterilization but also generation of uncontaminated micro-nano bubbles. The method defined in the present invention uses water hammering power produced by a mutual collision of jets of dissolved-gas-including solution squirted from two or more spouts.

Abstract: A coil component has a core including a winding core extending in a predetermined direction, and a winding wrapped around the winding core in two or more layers. A first winding portion at one end in the predetermined direction in an (n+1)'th layer of the winding, where n is a natural number, is positioned over a space between second and third winding portions in an n'th layer, the second and third winding portions being adjacently spaced in the predetermined direction.