Kay, Matthew W., Gregory P. Walcott, James D. Gladden, Sharon B. Melnick, and Jack M. Rogers. Lifetimes of epicardial rotors in panoramic optical maps of fibrillating swine ventricles. Am J Physiol Heart Circ Physiol 291: H1935–H1941, 2006. First published April 21, 2006; doi:10.1152/ajpheart.00276.2006.—During ventricular fibrillation (VF), electrical activation waves are fragmented, and the h...

Presently, there are two main aspects which allow to reduce the operating as well as the cold reserve power to be kept ready by individual network partners in order to maintain the power system reliability. First, the transmission lines, generators and loads are interconnected into large-scale and complex integrated systems. An important benefit brought about by the interconnected operation is ...

This paper presents the aerodynamic design of low noise wind turbine blades using Betz and Joukowski concepts. The aerodynamic model is based on Blade Element Momentum theory whereas the aeroacoustic prediction model is based on the BPM model. The investigation is started with a 3MW baseline/reference turbine rotor with a diameter of 80 m. To reduce the noise emission from the baseline rotor, t...

-Electromechanical wave propagation may affcet power system protective device operation. This paper discusses the testbed development to study the electromechanical wave propagation impacts on power system dynamic behavior, and consequently impacts on protective devices including overcurrent, distance, and out-of step relays. To have a better insight, a test bed to simulate electromechanical os...

Interest in electric unmanned aerial vehicles (UAVs) has grown rapidly recent years, and their applications have expanded diversified considerably since they first appeared, for both commercial private purposes. Thanks to ability perform challenging hazardous tasks with high mobility, safety, low cost. As academic researchers, we are concerned multi-rotor UAVs, which revolutionizing many public...

The benefits of energy and operational cost savings from using copper rotors are well recognized. The main barrier to die casting copper rotors is short mold life. This paper introduces a new approach for manufacturing copperbar rotors. Either copper, aluminum, or their alloys can be used for the end rings. Both solid-core and laminated-core rotors were built. High quality joints of aluminum to...

Six different wastewater treatment plants were monitored in order to identify the main bioaerosol sources and to evaluate the effect of the aeration system used in the biological treatment (air diffusion, horizontal rotors and surface turbine aerators) on the airborne microorganism levels to which workers may be exposed. Air samples were collected by using a single stage impactor. Total count o...

Power systems exhibit various modes of oscillation due to interactions among system components. Many of the oscillations are due to synchronous machine rotors swinging relative to each other. Controllable Series Devices (CSD), i.e. series connected Flexible AC Transmission Systems (FACTS) devices, such as Unified Power Flow Controller (UPFC), Controllable Series Capacitor (CSC) and Quadrature B...

Stability and control of rotors at high advance ratio are considered. Stability of teetering, articulated, and gimbaled hub types is considered with a simple flapping blade analysis. Rotor control in autorotation for teetering and articulated hub types is examined in more detail for a compound helicopter (rotor and fixed wing) using the comprehensive analysis CAMRAD II. Autorotation is found to...