ABSTRACT
This paper introduces an assist system for the blind.It utilizes ultrasonic to measure the distance and speed.Then the distance signal is converted to position of slip block and the speed signal is converted to tone.The main function of this sytem is to assist the blind to determine distance and speed of objects.It is practical,Simple and inexpensive.
ABSTRACT
The instrument is com posed of such components as SCM,pressure sensor,electric pump,magnetic valve and sleeve-type gasbag.It can control the hemostatic pressure,hemostatic time and slack time automatically.So the ischemic necrosis can be avoided thoroughly thr ough it.With the small volume,light weight,low power consumption and convenient operation,the instrument is fit for emergency treatment of mass casualties.