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Results for “HALL EFFECT”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The application of crystal field theory to the electrical properties of Co impurities in GaP.
Hall effect, electrical resistivity and optical transmission data and Co impurities in GaP studied via crystal field theory
Proton Damage to Silicon as a Function of Proton Energy
Proton damage to n and p-type silicon crystals as function of proton energy using hall effect
Study of true-product modulators Final report, 9 Jun. 1967 - 30 Mar. 1968
Development of breadboard true product modulator based on Hall effect
Note on the times characteristic on the motion of magnetic lines of force.
Characteristic time on motion of magnetic lines of force in medium with Hall effect
Annealing of electron damage in lithium-doped silicon at 300 K
Annealing of electron damage in lithium-doped silicon measured using Hall effect
Degradation of thin films of zinc oxide by ultraviolet radiation
Optical transmittance, Hall effect, and spectral photoconductivity measurements on thin films of zinc oxide in vacuum to determine degradation by ultraviolet radiation
Direct evidence for carrier locations in graphite - Thermoelectric and Hall quantum resonances
Thermoelectric power and Hall effect quantum resonances in pressure annealed pyrolytic graphite crystals for carrier locations evidence
Investigation of the behavior of the discharge and the flow in a homopolar device
Homopolar device electric arc dynamics dependence on gas type, noting flow geometry-Hall effect competition
Non-linear extreme quantum limit resistivity in graphite
Magnetoresistance nonlinearity and Hall effect in graphite in magnetic field, observing temperature dependence below 4.2 K
Direct evidence for majority carrier locations in the Brillouin zone of graphite
Thermoelectric power and Hall effect quantum resonances in graphite for locating majority carrier electron and hole Fermi Surfaces in Brillouin zone
Brushless DC motor with dual windings
Motor has high starting torque and high running speeds. Control system consists of Hall effect generator/resolver and associated electronic amplifiers and switches. Motor operation is described.
Hall current measuring apparatus having a series resistor for temperature compensation Patent
Current measurement by use of Hall effect generator
Brushless direct current tachometer Patent
Brushless dc tachometer design with Hall effect crystals and output voltage magnitude proportional to rotor speed
A brushless dc spin motor for momentum exchange altitude control
Brushless dc spin motor is designed to use Hall effect probes as means of revolving rotor position and controlling motor winding currents. This results in 3 to 1 reduction in watt-hours required for wheel acceleration, a 2 to 1 reduction in power to run wheel, and a 10 to 1 reduction in the electronics size and weight.
A magnetic mouse activity meter
Activity meter has been developed using Hall effect devices that record passage of selected groups of magnetically tagged mice. Two small permanent magnets are implanted in belly and back of selected mice and electronic circuits are activated as mice move between cages. System has advantage over tagging, detecting, and identification methods currently used.
Minority carriers in graphite.
Quantum oscillations as a function of magnetic field in the Hall effect and thermoelectric power are studied in two samples of pressure-annealed pyrolytic graphite. Only the oscillations originating from minority-Fermi-surface carriers are discussed. Frequencies of the de Haas-van Alphen type are measured over a wide range of angles between the magnetic field and the c axis of the Brillouin zone. Results are given graphically and analyzed.
Dispersive waves in a seeded MHD generator.
The equations giving the response of a slightly ionized plasma with monatomic components to sinusoidal perturbations have been formulated. Included in the model equations were the electron Hall effect, electron thermal diffusion, radiation, and electron-atom rate processes. Plasma conditions were limited to those where viscous effects, the induced magnetic field, ion slip, and atom-atom inelastic processes can be neglected. Presented are results of numerical calculations for MHD generators with a working fluid of potassium seeded argon.