Abstract: A motor housing may include a cast body. The cast body may include a cylindrical portion. At least one machined surface may be disposed on at least one of (i) an inner peripheral surface of the cylindrical portion and (ii) an outer peripheral surface of the cylindrical portion. A back side of the at least one machined surface may be an exposed non-machined surface.

Abstract: A cover member for a motor unit is disclosed. The cover member is interposed between a motor and a control substrate for controlling operation of the motor. The motor has a bus bar terminal electrically connected to a coil of a stator of the motor. The control substrate has a connection terminal that is fitted to the bus bar terminal and is made to electrically connect the control substrate to the stator. The cover member has a through hole, through which the bus bar terminal pierces, and an enclosing part for enclosing a fitting location for the bus bar terminal and the connection terminal, as seen in a piercing direction of the bus bar terminal.

Abstract: As a plant cultivation method by an artificial light irradiation which is convenient, highly energy efficient, and excellent in growth promoting effect, a plant cultivation method which promotes the plant growth by conducting a step S1 for irradiating a red illuminative light to a plant and a step S2 for irradiating a blue illuminative light to the plant separately and independently of each other within a certain time period. In this plant cultivation method, an extremely remarkable plant growth promoting effect can be obtained by a method as simple as an alternate irradiation with a red illuminative light and a blue illuminative light.

Abstract: As a simple and convenient method for promoting the proliferation of algae, a method for cultivating the algae while conducting a procedure S1 for irradiating a red illuminative light to the algae and a procedure S2 for irradiating a blue illuminative light to the algae separately and independently of each other within a certain time period is provided.