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 & Signal. The organization has 76365 authors who have published 110557 publications receiving 1885108 citations. The organization is also known as: General Electric Company & GE.

Review of patient safety in time-varying gradient fields.

Abstract: In magnetic resonance, time-varying gradient magnetic fields (dB/dt) may stimulate nerves or muscles by inducing electric fields in patients. Models predicted mean peripheral nerve and cardiac stimulation thresholds. For gradient ramp durations of less than a few milliseconds, mean peripheral nerve stimulation is a safe indicator of high dB/dt. At sufficient amplitudes, peripheral nerve stimulation is perceptible (i.e., tingling or tapping sensations). Magnetic fields from simultaneous gradient axes combine almost as a vector sum to produce stimulation. Patients may become uncomfortable at amplitudes 50%-100% above perception thresholds. In dogs, respiratory stimulation has been induced at about 300% of mean peripheral nerve thresholds. Cardiac stimulation has been induced in dogs by small gradient coils at thresholds near Reilly's predictions. Cardiac stimulation required nearly 80 times the energy needed to produce nerve stimulation in dogs. Nerve and cardiac stimulation thresholds for dogs were unaffected by 1.5-T magnetic fields.

Apparatus and method for reading data from an image detector

Abstract: A image detector includes an array of photodetectors arranged in n rows and m columns with at least a portion of the photodetectors in each column being selectively connected to a common column output signal line by a selector means. The image information is read out of the photodetectors by sequentially selecting groups of rows starting with a row near the middle of the array and then sequentially selecting other groups of rows on alternate sides of the array middle. As image data is read out of the photodetectors in the selected row group, groups of column outlet lines are coupled together to provide a combined output signal. This readout technique provides a reduction in the image data and reduces the likelihood of signal degradation for the central portion of the image.

A model for GRIN-SCH-SQW diode lasers

Abstract: A comprehensive model for graded-index, separate-confinement-heterostructure, single-quantum-well (GRIN-SCH-SQW) Al/sub x/Ga/sub 1-x/As diode lasers is presented, and compared with experimental data. The model combines many individual features not heretofore included together, and gives good agreement with gain-vs.-current density data for different structure variations. In addition, the threshold temperature dependence agrees well with data for typical laser conditions, and the high-gain kink in T/sub 0/ versus temperature is qualitatively explained. >

System and method for operating a wind farm under high wind speed conditions

Abstract: A system and method of operating a wind farm (12), having multiple wind turbine generators (14, 16, 18), at high wind speeds is provided. Wind speeds at individual wind turbine generators (14, 16, 18) are monitored and a signal is transmitted from the wind turbine generators (14, 16, 18) to a wind farm control system (50) based on the monitored wind speeds. Rate of change of collective power output of the wind farm (12) is temporally monitored and is controlled by coordinating of operational states of the wind turbine generators (14, 16, 18) based upon the signals transmitted by the one or more wind turbine generators (14, 16, 18), operating conditions of the wind turbine generators (14, 16, 18) and the monitored rate of change of power output of the wind farm (12).