General Electric

About: General Electric is a company organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Turbine & Rotor (electric). The organization has 76365 authors who have published 110557 publications receiving 1885108 citations. The organization is also known as: General Electric Company & GE.

MR-guided focused ultrasound surgery.

Abstract: Magnetic resonance guided focused ultrasound surgery provides a minimally invasive controlled method for selectively destroying deep-lying tissue. A thermal analysis of focused ultrasound provides an estimate of the time-dependent temperature distribution and thermal dose required for ultrasound surgery. The temperature distribution is estimated by accumulating heat sources, considering the effects of thermal conductivity, heat content, and perfusion. In this study, both gel phantoms and excised in vitro bovine muscle specimens were imaged in a 1.5 T MR system while heated with a 5 cm diameter, 10 cm focal length, 1.1 MHz transducer. During sonication, the thermal effects were observed with T1-weighted pulse sequences. Below a critical temperature, the heat zone appeared as a dark spot that moved with the focal spot. Above a critical thermal dose, the in vitro tissue was irreversibly altered and the focal lesion was observed on both the MR image and the specimen slice.

White light emitting phosphor blends for led devices

Abstract: There is provided a blue-green illumination system, comprising a light emitting diode (11), and at least one luminescent material (21) having at least two peak emission wavelengths, wherein the emission CIE color coordinates of the at least two peak emission wavelengths are located within an area of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates: e) x=0.0137 and y=0.4831; b) x=0.2240 and y=0.3890; c) x=0.2800 and y=0.4500; g) x=0.2879 and y=0.5196; and h) x=0.0108 and y=0.7220. The illumination system (51) may be used as the green light of a traffic signal (41). The luminescent material may be a blend of (Ba1-xEux)Mg2Al16O27 ('BAM') and (Ba1-xEux)Mg2-yMnyAl16O27 ('BAMMn') phosphors, where 0

Load Representation in Power System Stability Studies

Abstract: Proper representation of load is important in power system stability studies, but it is a difficult task. Load modeling is qualitatively different from generator modeling in many aspects. Composition of load needs to be reliably estimated, models of different components must be combined to obtain a reasonably manageable overall system model, and field measurements are not at all easy.

Highly reliable power line communications system

Abstract: An electric power line communication system (20) operates with an electric power distribution system to provide through premises power distribution lines (28) highly reliable communication links among receiving devices (26, 32, 40, 46, 68, 112) electrically coupled orlocated in proximity to the premises power distribution lines. A power line transceiver (22,30, 34) is designed to transmit and receive through the premises power distribution lines modulated carrier signals conveying information over the communication links. The powerline transceiver operates in a transmitter mode as an intentional radiator to emit modulated carrier signals by transmitting them at a frequency band and a power level sufficient to form by electrical conduction a communication link with a modulated carrier signal receiving device.