Abstract: A light receiving element includes a light receiving layer that includes a superlattice of an InAs layer and a GaSb layer, and an amorphous layer that covers a side wall surface of the light receiving layer. The amorphous layer contains In and As, and an amount of Ga and an amount of Sb contained in the amorphous layer are smaller than an amount of In and an amount of As contained in the amorphous layer.

Abstract: A vending machine includes a storage to store product management data in which an on-sale product management numbers is associated with product management content; an input and output unit to input and output the product management data; and an update control unit configured to update the product management data. Further, the update control unit collectively receives all the product management data including a part to be updated, stores all the product management data as update target product management data, displays the update target product management data including confirmation target information and stores the update target product management data as updated product management data.

Abstract: A vending machine includes a storage to store product management data in which an on-sale product management numbers is associated with product management content; an input and output unit to input and output the product management data; and an update control unit configured to update the product management data. Further, the update control unit collectively receives all the product management data including a part to be updated, stores all the product management data as update target product management data, displays the update target product management data including confirmation target information and stores the update target product management data as updated product management data.

Abstract: A propeller propulsion unit comprising a prime mover, propellers, and rotating force transmission for transmitting the rotating force of the prime mover to the propellers, wherein a counter propeller is fixed to a main shaft and a forward propeller is mounted to be rotatable on the main shaft, and these propellers are rotated in the directions reverse to each other by a belt transmission mechanism having forward and reverse running belts, whereby a lightweight moving body susceptible to an effect by a torque reaction can be steered stably.