Lower bounds to energy eigenvalues for the stark effect in a rigid rotator
Lower bounds to energy eigenvalues for rigid rotator in electric field Stark effect calculation - Schroedinger equation
ELECTRIC FIELD↗
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Results for “Eigenvalues”
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 computation of eigenvalues. i - real symmetric matrices.
Algorithmic methods for determining eigenvalues of real symmetric matrices by computer programming
MATRIX ALGEBRA↗
Studies in perturbation theory. ix - connection between various approaches in the recent development - evaluation of upper bounds to energy eigenvalues in schroedinger's perturbation theory.
Evaluation of upper bound to energy eigenvalues in Schroedinger perturbation theory, utilizing theory of inhomogeneous equations
PERTURBATION THEORY↗
Studies in perturbation theory. XI - Lower bounds to energy eigenvalues, ground state and excited states
Upper and lower bounds determined for energy eigenvalues using Hamiltonian operators and projections on manifolds in Hilbert regions
HAMILTONIAN↗
On the Eigenvalues of a Singular Nonself- Adjoint Differential Operator of Second Order
Singular nonself-adjoint differential operator of second order eigenvalues
PROBLEM SOLVING↗
The eigenvalue problem for beams and rectangular plates with linearly varying in-plane and axial load
Eigenvalue problem for beams and rectangular plates with linearly varying in-plane and axial load
STRUCTURAL BEAM↗
State variables for linear multivariable systems with multiple eigenvalues.
State variable approach for analysis of linear multivariable system with multiple eigenvalues
CONTROL SYSTEM↗
Upper and lower bounds for the eigenvalues of vibrating beams with linearly varying axial load
Upper and lower bounds for eigenvalues of vibrating beams and flat plates with varying axial load
AXIAL LOAD↗
Nonlinear system evaluation by observing eigenvalue motion
Nonlinear system evaluation by observing eigenvalue motion
NONLINEAR SYSTEM↗
On the best initial approximations in the eigenvalues problem of the Ritz and Bubnov- Galerkin methods
Mathematical procedure leading to better and simpler approximation expansion terms in eigenvalues problem of Ritz and Bubnov- Galerkin method
SERIES EXPANSION↗
Heat conduction as an equivalent eigenvalue problem
Nonhomogeneous heat-conduction equation transformation into discrete spectrum eigenvalue form
HEAT EQUATION↗
The calculation of upper and lower bounds of energy eigenvalues in perturbation theory by means of partitioning techniques.
Quantum mechanical perturbation theory calculation of upper and lower bounds of energy eigenvalues using partitioning methods
PERTURBATION THEORY↗
A modification of Potters' method for solving eigenvalue problems involving tridiagonal matrices.
Modification of Potter method of Gaussian elimination for solving eigenvalue problems of buckling and free vibrations of shells of revolution
SHELL STABILITY↗
Lower-bound procedure for energy eigenvalues by the partitioning technique.
Lower bound procedure in quantum mechanical energy equation eigenvalue problem by partitioning and bracketing Hilbert space
PARTITION FUNCTION↗
Parameter and domain dependence of eigenvalues of elliptic partial differential equations.
Parameter and domain dependence of eigenvalues of elliptic partial differential equations
BOUNDARY VALUE↗
On the eigenvalues of a singular nonself- adjoint differential operator of second order.
Characterization of eigenvalues of singular nonself-adjoint differential operator of second order
SINGULARITY /MATH/↗
Radio Frequency Interference Detection for Passive Remote Sensing Using Eigenvalue Analysis
Radio frequency interference (RFI) can corrupt passive remote sensing measurements taken with microwave radiometers. With the increasingly utilized spectrum and the push for larger bandwidth radiometers, the likelihood of RFI contamination has grown significantly. In this work, an eigenvalue-based algorithm is developed to detect the presence of RFI and provide estimates of RFI-free radiation levels. Simulated tests show that the proposed detector outperforms conventional kurtosis-based RFI detectors in the low-to-medium interference-to-noise-power-ratio (INR) regime under continuous wave (CW) and quadrature phase shift keying (QPSK) RFIs.
kurtosis↗
Radio Frequency Interference Detection for Passive Remote Sensing Using Eigenvalue Analysis
Radio frequency interference (RFI) can corrupt passive remote sensing measurements taken with microwave radiometers. With the increasingly utilized spectrum and the push for larger bandwidth radiometers, the likelihood of RFI contamination has grown significantly. In this work, an eigenvalue-based algorithm is developed to detect the presence of RFI and provide estimates of RFI-free radiation levels. Simulated tests show that the proposed detector outperforms conventional kurtosis-based RFI detectors in the low-to-medium interferece-to-noise-power-ratio (INR) regime under continuous wave (CW) and quadrature phase shift keying (QPSK) RFIs.
Passive remote sensing↗