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There are body-powered hooks and myoelectric prosthetic hands that trans-radial amputees can use for work. Though the body-powered hooks have good workability for complex operations, the design of the hook is unappealing and the harness is cumbersome. The myoelectric prosthetic hand has a natural appearance similar to the human hand and intuitive operability using a myoelectric control system. However, it is expensive and heavy. Because of these problems associated with prostheses for work, many amputees use cosmetic prostheses. In this paper, we report a lightweight, low-cost electric trans-radial prosthesis with three opposed fingers. A simple mechanism to control the fingers by a linear actuator contributes to its good workability, lightweight, and low-cost. An operation system using an inexpensive distance sensor allows intuitive operability equivalent to the myoelectric control system. A socket makes the prosthesis easily removable. The total weight of the hand and socket is 300 g, and both can be produced with a 3D printer. An evaluation using the Southampton Hand Assessment Procedure (SHAP) demonstrated that an amputee was able to operate abstract objects which require six types of grasps with the developed prosthesis.

流下方向に水路幅が緩やかに拡幅する開水路漸拡流の流速分布がX型 Hot-film 流速計によって測定された. その結果, 形状損失係数のオーダーは Diffuser のものに類似していること, 主流速の水平方向分布は内層では log 則によって, 外層では Goertler の平面噴流式によって表現できること, 主流速の鉛直方向分布は内層では log 則によって, 外層では log-wake 則によって表現できること, さらに, 3次元流況として, 水路幅の拡幅に伴い底面渦が水平方向に伸張して主流速分布を変形させていること, 乱れエネルギーが壁面より多少離れた領域で増加することなどが明らかにされた.