Horizontal rotational head movements were video-taped from pigeons standing freely in a rotating cylinder. The cylinder carried vertically striped patterns approximating a sinusoidally modulated horizontal intensity distribution. We altered systematically various stimulus parameters: spatial wavelength and contrast of the pattern, angular velocity of the pattern motion and mode of motion onset....

Microstructures, tensile properties and fracture energy of a friction stir spot welded polycarbonate (FSSW) were studied at varying rotational rates and dwelling time. The problem of common FSSW welding is the remaining of characteristic keyhole. This can act as a concentration place in mechanical tests. To order solve this problem authors took advantage of innovation for designing the welding ...

This paper presents the use of buck converter with Zero Average Dynamics to control speed a permanent magnet direct current motor. For this objective, we consider fourth-order nonlinear model that describes system’s dynamics and tests different scenarios determine how motor responds. The results show robust tracking performance under reference signal controller parameter changes disturbances in...

Supergranules create a peak in the spatial spectrum of photospheric velocity features. They have some properties convection cells but their origin is still being debated literature. The time-distance helioseismology constitutes method that suitable for investigating deep structure supergranules. Our aim to construct model flows average supergranular cell using fully consistent inverse methodolo...

The influence of number of autoclave treatment cycles (N) on rotational speed and total indicated run-out of commercially available air-turbine handpieces from five manufacturers was investigated at N=0, 50, 100, 150, 200, 250 and 300 cycles, and the significance in the test results was assessed by Dunnett's multiple comparison test. Some air-turbine handpieces showed the significant difference...