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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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Chapman-Ferraro problem analyzed by impinging high speed hydrogen plasma stream against three- dimensional magnetic dipole, discussing boundary shape
Current distribution on cylindrical dipole antenna in homogeneous warm plasma
Transient radiation of electric dipole in uniaxially anisotropic plasma examined for signal frequency greater and less than plasma frequency
In this presentation a 2.4 GHz low profile (lambda45) tunable dipole antenna is evaluated in the presence of a human core model (HCM) body phantom. The antenna uses a frequency selective surface (FSS) with interdigital barium strontium titanate (BST) varactor-tuned unit cells and its performance is compared to a similar low profile antenna that uses an FSS with semiconductor varactor diodes. The measured data of the antenna demonstrate tunability from 2.2 GHz to 2.55 GHz in free space and impedance match improvement in the presence of a HCM at different distances. This antenna has smaller size, lower cost and less weight compared to the semiconductor varactor diode counterpart.
Approximation of a solenoid magnetic field by an ideal dipole field with correction terms
Adiabatic invariants of charged particle motion used to calculate trajectories of particles in dipole model of magnetosphere
Cylindrical dipole antenna field in compressible isotropic plasma, assuming triangular current distribution and deriving input impedance formula
Radiation patterns of infinitesimal dipole in lossless magnetoplasma studied by classification of associated dispersion surfaces
Spectroscopic studies on seeded plasma interaction with magnetic dipole field
Dipole integrals for nonmetal resonance transition probabilities
First order perturbation analysis of atom lifetime undergoing dipole transition due to presence of resonating atom
Relationship between field singularities of electrostatic theory and equations for fixed charge and dipole models, including geometrical distributions
Space and time dependence of decaying resonant oscillations excited in collisionless plasma by infinitesimally small pulsed dipole
Dipole matrix elements for helium in first order shielding approximation as function of screening parameter
Formulas are derived that express the contributions of the electric quadrupole-quadrupole and dipole-octupole forces, respectively, to the dispersion energy of two unexcited molecules possessing axial symmetry. The formulas are valid in situations where the optical dispersion curve of each molecule is adequately characterized by a pair of resonance frequencies.
Simple and quantitatively accurate representation of current distribution in dipole antennas
Resonances in driving point impedance of electric dipole antenna in ionosphere
Ion motion in field of fixed point electric dipole