ffects of pressure ratio and rotational speed on the leakage flow nd cavity pressure characteristics of the rotating staggered labyinth seal were investigated by means of experimental measureents and numerical simulations. The rotating seal test rig with urbine flowmeter and pressure measuring instruments was utiized to investigate the leakage flow of the staggered labyrinth eal at eight pressu...

A major debate in the mental-rotation literature concerns the question of whether objects are represented holistically during rotation. Effects of object complexity on rotational speed are considered strong evidence against such holistic representations. In Experiment 1, such an effect of object complexity was markedly present. A closer look on individual performance patterns, however, revealed...

In this paper mathematical models are proposed for calculating rotational speed, signal period, duty cycle and phase drift of gear tooth speed sensors with dual outputs. The proposed mathematical models are applied to parameter determination/optimization and target wheel design of Hall Effect gear tooth sensors and measuring systems. Experiment results show that the mathematical models are very...

OBJECTIVE Preliminary assessment of the efficacy and safety of the low speed rotational angioplasty catheter system (ROTACS). DESIGN Open prospective trial. SETTING Department of cardiology in a teaching hospital. PATIENTS Eleven patients (10 with chronic stable angina and one with acute coronary occlusion after conventional angioplasty) in whom a coronary angiogram showed occlusion or cr...

in this study, the characteristics of the wake around a rotating circular cylinder have been investigated experimentally. to this end, a cylinder with a circular cross-section of plexiglas with the length of 400 mm and a diameter of 20 mm have been tested in the wind tunnel. using existing methods, the characteristics of the wake and the drag coefficients of the model in different cases have be...

Within this study the decay speed of centrifugal device induced rotational airflow in round ducts and its conditioning for dust concentration measurement was investigated. Tests were conducted under room conditions at average Reynolds numbers within the range of 0.7–1.14x10. Duct diameters were 152 mm and 203 mm. Airflow in the ducts was found nonuniform and unsteady within the axial location t...

The growing number of civil applications in which Unmanned Aerial Vehicles (UAVs) are involved can create many concerns for airspace security and surveillance. Gathering as much information possible about a drone be crucial to apply proper countermeasures if potentially dangerous situation is detected. Of course, the presence UAV detected by radar, but it extend system capabilities obtain addit...