Search Results - "Howard, Allen Q"

Four Methods for LIDAR Retrieval of Microscale Wind Fields by Howard, Allen Q., Naini, Thomas

“…This paper evaluates four wind retrieval methods for micro-scale meteorology applications with volume and time resolution in the order of 30m3 and 5 s. Wind…”
Get full text

Electric dipole scattering from a finitely conducting cylinder by Howard, Allen Q., Miranda, Diego C.

“…•Electromagnetic scattering of cylindrical structures in applied geophysics.•Frequency domain analytic solution of an electric dipole.•Fourier–Bessel series as…”
Get full text

Complex plane integration in the modelling of electromagnetic fields in layered media: part 2. Pole location by Howard, Allen Q, da Silva e Silva, Valdelirio

“…This part 2 companion paper derives several related methods to determine pole location for guided electromagnetic waves in a planarly layered medium in the…”
Get full text

Complex plane integration in the modelling of electromagnetic fields in layered media: part 1. Application to a very large loop by da Silva e Silva, Valdelírio, Régis, Cícero, Howard, Allen Q

“…This paper analyses the details of a procedure for the numerical integration of Hankel transforms in the calculation of the electromagnetic fields generated by…”
Get full text

Petrophysics of magnetic dipole fields in an anisotropic earth by Howard, A.Q.

“…Measurement-while-drilling (MWD) resistivity log data are often acquired in highly deviated or horizontal holes. The loop sensors are located on the drill…”
Get full text

A new correction to the Born approximation by Howard, A.Q., Chew, W.C., Moldoveanu, M.C.

“…A correction to the Born approximation for the apparent conductivity (induced voltage) in a layered medium is derived. The correction involves a single…”
Get full text

On Resolution in Geophysical Probing Using Electromagnetic Methods by Howard, Allen Q.

“…A model of a surface magnetic loop induction scheme over a two layer earth with fixed parameters, is developed. Using this model, formulas and curves are…”
Get full text

Transient Response from a Thin Sheet in a Conductive Medium for Loop Excitation by Howard, Alien Q.

“…An analytical method to predict the electromagnetic step function response of a thin sheet anomaly in the Earth is given. Insight is provided for the…”
Get full text

On the longitudinal component of the Green's function dyadic by Howard, A.Q.

“…Discussion of the divergenceless property of the right-hand side of the dyadic-wave equation for the Green's dyad has centered on the inconsistency of…”
Get full text

Synthesis of EM geophysical tomographic data by Howard, A.Q., Kretzschmar, J.L.

“…In order to test tomographic inversion schemes under controlled conditions, we have developed a forward electromagnetic model, using the volume current method…”
Get full text

On approximating Fourier integral transforms by their discrete counterparts in certain geophysical applications by Howard, A.

“…In the past, fast Fourier transforms (FFT's) have been used in geophysical data analysis and, with some success, in theoretical analysis. However, in the…”
Get full text

A comparison of mode match, geometrical theory of diffraction, and Kirchhoff radiation by Howard, A.

“…Using as a model a parallel-plate flanged waveguide excited by a uniform magnetic line source, the techniques of mode match, geometrical theory of diffraction,…”
Get full text

Geophysical Diffraction Tomography by Devaney, A. J.

“…Diffraction tomography is the generalization of X-ray tomography to applications such as seismic exploration where diffraction effects must be taken into…”
Get full text

Two-Dimensional DC Resistivity Inversion for Dipole-Dipole Data by Smith, Nariida C., Vozoff, Keeva

“…A procedure is described for interpreting the results of direct current resistivity measurements in regions where the underlying structure cannot be assumed to…”
Get full text

The Detection of Induced Polarization with a Transient Electromagnetic System by Lewis, Roger J. G., Lee, Terry J.

“…The study of two-dimensional TEM models consisting of a cylinder in a conductive host using measured rock properties show that TEM surveys are capable of…”
Get full text

Borehole Resistivity And Electromagnetic Methods Applied to Mineral Exploration by Daniels, Jeffrey J., Dyck, Alfred V.

“…Electrical methods using buried transmitters or receivers have become increasingly important exploration tools as exploration for deep mineral deposits has…”
Get full text

Block Diagonalization of the Electromagnetic Impedance Matrix of a Symmetric Buried Body Using Group Theory by Tripp, Alan C., Hohmann, Gerald W.

“…A major problem with the volume-current integral-equation technique of three-dimensional electromagnetic modeling is the computational time and-storage…”
Get full text

General Formulation of the Induction Logging Problem for Concentric Layers about the Borehole by Wait, James R.

“…The electromagnetic theory of induction sounding in boreholes is developed for the general case where the formation adjacent to the hole is concentrically…”
Get full text

Inversion of Transient Electromagnetic Data from a Spherical Conductor by Lee, Terry J.

“…This paper considers the problem of inverting single loop transient electromagnetic data from a spherical conductor. First, analytical expressions are…”
Get full text

Computation of Scattering from Penetrable Cylinders with Improved Numerical Efficiency by Izadian, Jamal S., Peters, Leon, Richmond, Jack H.

“…An integral-equation formulation is used to obtain numerical results for the scattered fields of a penetrable cylinder immersed in either a lossy halfspace or…”
Get full text