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Interferometric SAR phase difference calibration: Methods and results

Description: This paper addresses the steps necessary to determine and maintain the phase calibration of a two-channel interferometric synthetic aperture radar (IFSAR). The method, setup, and accuracy of four different calibration techniques are compared. The most novel technique involves pointing the interferometric baseline at nadir and imaging a lake surface. The other techniques include measuring various flat surfaces in traditional side-looking IFSAR maps, in-flight closed-loop calibration path measure… more
Date: December 31, 1993
Creator: Bickel, D. L. & Hensley, W. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Digitally controlled distributed phase shifter

Description: A digitally controlled distributed phase shifter is comprised of N phase shifters. Digital control is achieved by using N binary length-weighted electrodes located on the top surface of a waveguide. A control terminal is attached to each electrode thereby allowing the application of a control signal. The control signal is either one of two discrete bias voltages. The application of the discrete bias voltages change the modal index of a portion of the waveguide that corresponds to a length of th… more
Date: December 31, 1992
Creator: Hietala, V. M.; Kravitz, S. H. & Vawter, G. A.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Phase-sensitive flow cytometer

Description: This report describes phase-sensitive flow cytometer (FCM) which provides additional FCM capability to use the fluorescence lifetime of one or more fluorochromes bound to single cells to provide additional information regarding the cells. The resulting fluorescence emission can be resolved into individual fluorescence signals if two fluorochromes are present or can be converted directly to a decay lifetime from a single fluorochrome. The excitation light for the fluorochromes is modulated to pr… more
Date: December 31, 1992
Creator: Steinkamp, J. A.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Multichannel wave interferometry

Description: The analysis of multichannel wave interferometry for a variety of density profiles reveals that the phase shift as a function of horn position normalized to that through the center of the plasma, is relatively insensitive to K = n/sub o//n/sub c/ (the ratio of maximum density to cutoff density) when refraction effects are minimized. Thus, this ratio may be easily inverted to obtain a reasonably accurate measurement of the density profile even for values of K approaching 1.
Date: December 1, 1975
Creator: Hosea, J. C. & Jobes, F. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hadron interactions

Description: In this talk I am reviewing recent calculations of properties of multi-hadron systems in lattice QCD. In particular, I am reviewing results of elastic scattering phase shifts in meson-meson, meson-baryon and baryon-baryon systems, as well as discussing results indicating possible existence of bound states in two baryon systems. Finally, calculations of properties of systems with more than two hadrons are presented.
Date: December 1, 2011
Creator: Orginos, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Equation of State, Occupation Probabilities and Conductivities in the Average Atom Purgatorio Code

Description: We report on recent developments with the Purgatorio code, a new implementation of Liberman's Inferno model. This fully relativistic average atom code uses phase shift tracking and an efficient refinement scheme to provide an accurate description of continuum states. The resulting equations of state accurately represent the atomic shell-related features which are absent in Thomas-Fermi-based approaches. We discuss various representations of the exchange potential and some of the ambiguities in … more
Date: December 22, 2006
Creator: Sterne, P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TABLE OF ELECTRONIC RADIAL FUNCTIONS AT THE NUCLEAR SURFACE AND TANGENTS OF PHASE SHIFTS

Description: Tables of electronic radial functions are presented. The finite nuclear size effects and the finite deBroglie wave length effects were incorporated in this work. A brief summary of the formulation of the problem is given. (M.C.G.)
Date: December 21, 1961
Creator: Bhalla, C.P. & Rose, M.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photon acceleration via laser-produced ionization fronts

Description: Microwave radiation has been upshifted in frequency and compressed in duration by more than a factor of five via its interaction with a relativistically propagating, underdense ionization front. The experimental observations are in good agreement with theoretical predictions.
Date: December 31, 1992
Creator: Savage, R. L. Jr.; Brogle, R. P.; Mori, W. B. & Joshi, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Tabulated p--$sup 4$He phase shifts

Description: This table contains calculated phase shifts for p--$sup 4$He elastic scattering from 0 to 17 MeV at intervals suitable for linear interpolation. (auth)
Date: December 1, 1975
Creator: Dodder, D.C.; Hale, G.M.; Jarmie, N.; Jett, J.H.; Keaton, P.W. Jr.; Nisley, R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Model Catalysis of Ammonia Synthesis ad Iron-Water Interfaces - ASum Frequency Generation Vibrational Spectroscopic Study of Solid-GasInterfaces and Anion Photoelectron Spectroscopic Study of Selected Anionclusters

Description: The ammonia synthesis reaction has been studied using single crystal model catalysis combined with sum frequency generation (SFG) vibrational spectroscopy. The adsorption of gases N{sub 2}, H{sub 2}, O{sub 2} and NH{sub 3} that play a role in ammonia synthesis have been studied on the Fe(111) crystal surface by sum frequency generation vibrational spectroscopy using an integrated Ultra-High Vacuum (UHV)/high-pressure system. SFG spectra are presented for the dissociation intermediates, NH{sub 2… more
Date: December 15, 2005
Creator: Ferguson, Michael James
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Determination of the Nucleon-Nucleon Elastic Scattering Matrix : I. Phase Shift Analysis of Experiments Near 140 MEV

Description: A phase shift analysis is an attempt to translate experimental measurements (observables) into well-determined scattering amplitudes, since these are the quantities that can be readily compared with theoretical predictions, In this sense, the phase shift analysis should contain as little theory as possible. The scattering amplitudes (or phase shifts) constitute an experimental statement, and the phase shift analysis should logically be done by the experimental groups who measure the observables. more
Date: December 6, 1963
Creator: MacGregor, Malcolm. H. (Malcolm Herbert), 1926-2019; Arndt, R. A. & Dubow, A. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nucleon-nucleon interactions

Description: Nucleon-nucleon interactions are at the heart of nuclear physics, bridging the gap between QCD and the effective interactions appropriate for the shell model. We discuss the current status of {ital NN} data sets, partial-wave analyses, and some of the issues that go into the construction of potential models. Our remarks are illustrated by reference to the Argonne {ital v}{sub 18} potential, one of a number of new potentials that fit elastic nucleon-nucleon data up to 350 MeV with a {Chi}{sup 2}… more
Date: December 31, 1996
Creator: Wiringa, R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Intensity Masking to Get High Resolution Images from Low Quality Apertures

Description: The effort and expense required to build and maintain an optical-quality telescope increases dramatically with the size of the telescope aperture, and this is especially so in space. But scenarios have been proposed for deploying (for instance, inflatable) telescopes with very large but considerably lecithin optical-quality apertures. Our interest is in ameliorating the effects of the low quality aperture in order to exploit the raw size of the aperture to obtain high resolution images. We desc… more
Date: December 31, 1997
Creator: Theiler, J. P. & Priedhorsky, W. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Relativistic charge form factor of the deuteron

Description: Relativistic integral representation in terms of experimental neutron-proton scattering phase shifts alone is used to compute the charge form factor of the deuteron G{sub Cd}(Q{sup 2}). The results of numerical calculations of {vert_bar}G{sub Cd}(Q{sup 2}){vert_bar} are presented in the interval of the four-momentum transfers squared 0 {<=} Q{sup 2} {<=} 35 fm{sup {minus}2}. Zero and the prominent secondary maximum in {vert_bar}G{sub Cd}(Q{sup 2}){vert_bar} are the direct consequences of … more
Date: December 1, 1997
Creator: Afanasev, Andrei V.; Afanasev, V.D. & Trubnikov, S.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fiber Optic Calorimetry

Description: A twin-bridge calorimeter using optical fiber as the sensor element was constructed and tested. This system demonstrates the principle and capability of using optical fibers for heat-flow measurements of special nuclear material. This calorimeter uses piezoelectric-generated phase-carrier modulation with subsequent electronic signal processes to allow phase shifts as small as 1 microradian ({micro}rad) to be measured. The sensing element consists of 21-m lengths of single-mode optical fiber wra… more
Date: December 12, 1997
Creator: Rudy, C.; Bayliss, S.; Bracken, D.; Bush, J. & Davis, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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