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Articles 1  9 of 9
FullText Articles in Physics
Joint Map Registration And High Resolution Image Estimation Using A Sequence Of Undersampled Images, Russell C. Hardie, Kenneth J. Barnard, Ernest E. Armstrong
Joint Map Registration And High Resolution Image Estimation Using A Sequence Of Undersampled Images, Russell C. Hardie, Kenneth J. Barnard, Ernest E. Armstrong
Electrical and Computer Engineering Faculty Publications
n many imaging systems, the detector array is not sufficiently dense to adequately sample the scene with the desired field of view. This is particularly true for many infrared focal plane arrays. Thus, the resulting images may be severely aliased. This paper examines a technique for estimating a highresolution image, with reduced aliasing, from a sequence of undersampled frames. Several approaches to this problem have been investigated previously. However, in this paper a maximum a posteriori (MAP) framework for jointly estimating image registration parameters and the highresolution image is presented. Several previous approaches have relied on knowing the registration parameters ...
Magnetomechanical Effect In Nickel And Cobalt, Michael K. Devine, David C. Jiles
Magnetomechanical Effect In Nickel And Cobalt, Michael K. Devine, David C. Jiles
Ames Laboratory Publications
The change in magnetization as a result of applied uniaxial stress has been measured in nickel and cobalt. Both tensile and compressive stresses were applied up to 125 MPa. Magnetostriction and anhysteretic magnetization as a function of stress were also measured. The change in magnetization with stress depended on the applied stress and the displacement between the prevailing magnetization and anhysteretic. At the loop tips, nickel showed a +6 mT (compression) and −6 mT (tension) magnetization change while cobalt displayed a +15 mT (compression) and −15 mT (tension) magnetization change. At remanence,nickel decreased in magnetization by 45 mT under ...
Barkhausen Effect In Steels And Its Dependence On Surface Condition, Anthony P. Parakka, David C. Jiles, H. Gupta, M. Zang
Barkhausen Effect In Steels And Its Dependence On Surface Condition, Anthony P. Parakka, David C. Jiles, H. Gupta, M. Zang
Center for Nondestructive Evaluation Publications
Micromagnetic Barkhausen signals from magnetic materials originate from the discontinuous changes in magnetization under the action of a changing applied magnetic field.Barkhausen emissions that are detected by a sense coil come predominantly from a surface layer. In iron based materials this layer is about 500 μm thick. The Barkhausen signal is affected by changes in material microstructure and the presence of residual stress, since these affect the dynamics of domain wall motion. The selective attenuation of high frequency components of the Barkhausen signal due to eddy currents in electrically conducting materials is used to evaluate changes in material condition ...
Generalization Of Hysteresis Modeling To Anisotropic Materials, A. Ramesh, David C. Jiles, Y. Bi
Generalization Of Hysteresis Modeling To Anisotropic Materials, A. Ramesh, David C. Jiles, Y. Bi
Materials Science and Engineering Publications
An extension to the model of hysteresis has been presented earlier which included the effect of anisotropy in the modeling of the anhysteretic magnetization curves of uniaxially anisotropic single crystalline materials. Further exploration of this extension shown here considers different kinds of crystal anisotropy in materials. Theory considers that the differential susceptibility at any given field is determined by the displacement of the prevailing magnetization from the anhysteretic magnetization. Thus, it has been shown that the effect of anisotropy on magnetic hysteresis in materials can be incorporated into the model of hysteresis through the anisotropic anhysteretic. This extension is likely ...
Nonlinear Response Of Superconductors To Alternating Fields And Currents , Jason R. Mcdonald
Nonlinear Response Of Superconductors To Alternating Fields And Currents , Jason R. Mcdonald
Retrospective Theses and Dissertations
Nonlinearities caused by vortex pinning and weak links in superconductors are considered. The effects of vortex pinning will be treated in both the parallel and perpendicular geometries using the critical state model. The results for the parallel geometry will be used to calculate the nonlinear surface impedance of a hard typeII superconductor. The results for the perpendicular geometry will be used to treat harmonic generation (HG) and intermodulation distortion (IM) in superconducting transmission lines and resonators. Nonlinearites due to weak links will be modelled using both the resistively shunted junction model (RSJ) for small junctions, and the damped sineGordon equation ...
Reflection HighEnergy ElectronDiffraction Study Of Melting And Solidification Of Pb On Graphite, Z. H. Zhang, P. Kulatunga, H. E. ElsayedAli
Reflection HighEnergy ElectronDiffraction Study Of Melting And Solidification Of Pb On Graphite, Z. H. Zhang, P. Kulatunga, H. E. ElsayedAli
Electrical & Computer Engineering Faculty Publications
The melting and solidification of Pb thin films on pyrolytic graphite are investigated in situ by reflection highenergy electron diffraction. Thin films with thicknesses of 4150 monolayers are investigated. The surface morphology of the thin films were studied by scanning electron microscopy. Superheating of the Pb thin films by 4±2 to 12±2 K is observed from diffraction intensity measurements. Upon cooling the substrate, the Pb on graphite is seen to supercool by ∼69±4 K.
TwoDimensional Pancake Vortices In A Finite Stack Of Magnetically Coupled Thin Superconducting Films , Thomas Lim Pe
TwoDimensional Pancake Vortices In A Finite Stack Of Magnetically Coupled Thin Superconducting Films , Thomas Lim Pe
Retrospective Theses and Dissertations
This dissertation investigates the structure and behavior of twodimensional (2D) pancake vortices in a stack of N Josephsondecoupled superconducting thin films under a magnetic field applied prependicular to the layers. This system of magnetically coupled superconducting films is proposed as a model for the multilayered highTc superconductors. Starting with the properties of one pancake vortex located in any of the N superconducting layers, an analytical expression is derived for the magnetic coupling force between pairs of 2D pancake vortex lattices residing in different layers, each having the same lattice structure, but displaced (not rotated) relative to each other. Using this ...
Design, Analysis, And Modeling Of Giant Magnetostrictuve Transducers , Frederick Theodore Calkins
Design, Analysis, And Modeling Of Giant Magnetostrictuve Transducers , Frederick Theodore Calkins
Retrospective Theses and Dissertations
The increased use of giant magnetostrictive, TerfenolD transducers in a wide variety of applications has led to a need for greater understanding of the materials performance. This dissertation attempts to add to the TerfenolD transducer body of knowledge by providing an indepth analysis and modeling of an experimental transducer. A description of the magnetostriction process related to TerfenolD includes a discussion of material properties, production methods, and the effect of mechanical stress, magnetization, and temperature on the material performance. The understanding of the TerfenolD material performance provides the basis for an analysis of the performance of a TerfenolD transducer. Issues ...
Signal Processing And Image Restoration Techniques For TwoDimensional Eddy Current Nondestructive Evaluation , Bing Wang
Retrospective Theses and Dissertations
This dissertation presents a comprehensive study on the forward modeling methods, signal processing techniques, and image restoration techniques for twodimensional eddy current nondestructive evaluation. The basic physical forward method adopted in this study is the volume integral method. We have applied this model to the eddy current modeling problem for half space geometry and thin plate geometry. To reduce the computational complexity of the volume integral method, we have developed a wavelet expansion method which utilizes the multiresolution compression capability of the wavelet basis to greatly reduce the amount of computation with small loss in accuracy. To further improve the ...