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.

Transponder unit for measuring temperature and current on live transmission lines

Abstract: A toroidal shaped transponder unit is connected to a live power transmission line by means of a tripping mechanism and a hinge assembly. The unit includes means for sensing the temperature and current of the power transmission line and for transmitting the information to a local receiver. The toroid housing includes an open frame mounting hub and spoke assembly for mounting the sensors without interfering with the thermodynamics of the transmission line. The unit further includes a power coil and core assembly for receiving magnetic emanations from the transmission line and generating power to operate the electronic components within the unit.

Performance analysis of a three-phase induction motor under mixed eccentricity condition

Abstract: A substantial portion of induction motor faults is eccentricity related. In practice, static as well as dynamic eccentricities happen to exist together. With this point in mind, an analytical approach to evaluate performance of a three-phase induction motor under mixed eccentric condition has been presented in this paper. Clear and step-by-step theoretical analysis, explaining completely the presence of certain harmonics in the line current spectrum in presence of eccentricity, is discussed. More importantly, it is shown for the first time that a link exists between the lowi and the high-frequency elements of these harmonics. It is also shown that these high-frequency components are not very strong in all types of machines. These results will be useful in generating rules and laws to formulate on-line tools for machine condition monitoring. Finite element results to substantiate the inductance values used in the simulation are also included. The analysis is validated by the line current spectrum of the eccentric machine obtained through simulation using modified winding function approach (MWFA) and experimentation.

A signal-to-noise calibration procedure for NMR imaging systems

Abstract: A nuclear magnetic resonance (NMR) imaging system signal-to-noise calibration technique based on an NMR projection of distilled water in a cylindrical bottle is proposed. This measurement can characterize any arrangement of rf coils in any magnetic field as signal to noise per ml times root Hz. Inductive losses in a typical patient must be included in the calibration, and such losses can be simulated in a particular system by an externally attached resistor(s) appropriate to that system. Alternatively, an rf inductive damping phantom consisting of a conducting loop of wire containing an appropriate resistor is suggested that can be inserted into any NMR imaging coil to simulate subject Q damping. The same resistor can be used, independent of the details of the coil construction. Furthermore, if the loop inductance is tuned out at each frequency with a series capacitor, then the same loop resistance will serve for all frequencies as a good approximation to human subject damping. This "projection method" signal-to-noise ratio is related to the conventional signal-to-noise ratio measured from a Lorentzian-shaped spectral line as psi P = psi L [2/T2]1/2, where psi stands for signal-to-noise ratio, subscripts P and L stand, respectively, for the projection and "Lorentzian" methods, and T2 is the transverse relaxation time of the spectral line used in the Lorentzian method.

Electronic purchasing method and apparatus for performing the same

Abstract: A computer-assisted method includes hardware, software and telecommunications components that cooperatively achieve the technical effect of an improved electronic purchasing transaction system. In various embodiments of the invention, at least one master account is established for a client. A pool of limited use account identifiers or secondary account identifiers, that are separate and distinct from the master account, is associated with the master account by a purchasing system or account management system. Each of the limited use account identifiers may be used by the client to purchase items from merchants.

Magnetomechanical properties of amorphous metals

Abstract: Amorphous metals have magnetomechanical properties superior to those of crystalline magnetostrictive materials, and are therefore being considered for a variety of transducer and sensor applications. A simplified model is presented of magnetomechanical coupling in amorphous metal ribbons, showing the relation between magnetomechanical behavior and fundamental material parameters. Although high values of magnetization and magnetostriction are important, it is primarily the low values of magnetic anisotropy achievable that give amorphous metals their outstanding magnetomechanical coupling. The magnitude and homogeneity of this anisotropy is controllable through choice of alloy composition and annealing conditions. Amorphe Metalle haben bessere magnetomechanische Eigenschaften als kristalline Werkstoffe, und werden deshalb fur Anwendungen als Energieumwandler und Kraftubertrager betrachtet. Ein vereinfachtes Modell der magnetomechanischen Kopplung in amorphen metallischen Bandern wird gegeben, das die Beziehung zwischen magnetomechanischem Verhalten und grundlegenden Parametern des Werkstoffes erkart. Obwohl hohe Werte der Magnetisierung und Magnetostriktion wichtig sind, stammen die hervorragenden magnetomechanischen Kopplungseigenschaften in amorphen Metallen hauptsachlich von den niedrigen Werten der magnetischen Anisotropie. Die Werte und die Homogenitat der Anisotropie werden durch die Legierungszusammensetzung und die Anlasbedingungen kontrolliert.