In magnetic abrasive finishing (MAF), abrasive grains as a tool move on surface and can remove chip from surface of work piece. In this study AL 6061 tube was considered as the work piece and the effect of finishing parameters such as gap distance between tube and poles, rotational speed of tube, abrasive ration and finishing time on surface roughness was investigated. The mixture of ferromagne...

The evolution of endoscopic capsules from passive tools to robotic devices is increasingly attracting the interest of the research community. In the past few years, significant progress has been achieved in the miniaturization of electronics and electromechanical systems. However, their use in commercial endoscopic capsules is hindered by their increased power demands, which, to present, cannot...

Pupae of some insects produce sounds or vibrations, but the function of the sounds/vibrations has not been clarified in most cases. Recently, we found vibratory communication between pupae and larvae of a group-living beetle Trypoxylus dichotoma, which live in humus soil. The vibratory signals produced by pupae were shown to deter approaching larvae, thereby protecting themselves. In the presen...

In a clinical application, a method for an examination of a vibratory sense is not very objective and it depends on an active cooperation of a patient, which cannot be achieved in every situation. The aim of this research is to define parameters of an evoked potentials method with a vibratory stimulation technique which would establish reliable and repeatable results applicable in a clinical us...

Readout Techniques for High-Q Micromachined Vibratory Rate Gyroscopes

In normal subjects, a rise in skin temperature causes a decrease in vibratory perception thresholds. In this study, vibratory thresholds on the foot were measured before and after local warming of the skin in patients with diabetic or uraemic neuropathy. On warming, the thresholds increased in nine of 11 diabetic patients while they decreased in 10 of 13 uraemic patients. In two-thirds of the p...

Vibratory perception thresholds were measured by an electromagnetic device applied over the clavicles of 64 patients with spinal cord injuries. Patients with neurological levels of C5 and below had low threshold values (0.63 +/- 0.23 micron of vibration amplitude; mean +/- SD) which were used as reference values. The patients with a neurological level of C1/2 had very high vibratory thresholds ...

Animal communication signals can be highly elaborate, and researchers have long sought explanations for their evolutionary origins. For example, how did signals such as the tail-fan display of a peacock, a firefly flash or a wolf howl evolve? Animal communication theory holds that many signals evolved from non-signalling behaviours through the process of ritualization. Empirical evidence for ri...

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