Our experiments on viscous (Saffman-Taylor) fingering in Hele-Shaw channels reveal several phenomena that were not observed in previous experiments. At low flow rates, growing fingers undergo width fluctuations that intermittently narrow the finger as they evolve. The magnitude of these fluctuations is proportional to Ca−0.64, where Ca is the capillary number, which is proportional to the finge...

Figure 1. Left small finger amputation site with small round tender mass (white arrow) on ulnar aspect. DESCRIPTION A 54-year-old man with an extensive history of burns to more than 60% of his body, some years ago, complained of a sharp, unremitting pain in the ulnar distribution of the left hand. Physical examination revealed a previously amputated left small finger with exquisite point tender...

This works shows the conceptual development of a finger mechanism for a prothestic hand. Three degrees of freedom of the finger are actuated by single DC motor, characterizing therefore an underactuated mechanical system. Mechanical torque developed by the motor is transmitted to the phalanges through tendons and is converted into flexion and extension torques by means of small pulleys. The ten...

Our experiments on viscous (Saffman-Taylor) fingering in Hele-Shaw channels reveal finger width fluctuations that were not observed in previous experiments, which had lower aspect ratios and higher capillary numbers Ca. These fluctuations intermittently narrow the finger from its expected width. The magnitude of these fluctuations is described by a power law, Ca(-0.64), which holds for all aspe...

INTRODUCTION The head-mounted display (HMD) system is a novel personalized imaging monitoring system for use in a medical setting. AIM To support interactive intraoperative communication among HMD wearers, we integrated vision-based finger tracking into our system as a pointing device. MATERIAL AND METHODS Our vision-based finger tracking system is composed of a commercially available real-...