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A Theory of Mutual Impedances and Multiple Reflections in an N-Element Array Environment

Description: Abstract: A general theoretical approach is formulated to describe the complex electromagnetic environment of an N-element array. The theory reveals the element-to-element interactions and multiple reflections within the array. From the formulation, it is found that the interaction between an excited element and an open-circuited element can be viewed as the sum of terms describing all possible signal paths within the array environment which start from the radiating element and terminate on the element under observation. Within all paths except the most direct one, multiple reflections between subgroups of elements take place. The resulting solution is highly structured and recursive and is discussed in detail in the text. Illustrative examples are provided to facilitate understanding of these ideas.
Date: February 1985
Creator: Muth, Lorant A.
Partner: UNT Libraries Government Documents Department
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An Error Analysis for the Use of Presently Available Lunar Radio Flux Data in Broadbeam Antenna-System Measurements

Description: From introduction: Simple, precise expressions for lunar diameter, average brightness temperature, flux density, and shape factor are presented. An analysis of the relationship between these parameters and corresponding errors are included. For broadbeam (HPBW>d) antennas, results show that flux density and shape factor can be determined with errors less than 13 percent and 0.4 percent respectively at frequencies below 10 GHz. Extension of the analysis to higher frequencies is indicated.
Date: February 1984
Creator: Daywitt, William C.
Partner: UNT Libraries Government Documents Department
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Theory of Near-Field Phased Arrays for Electromagnetic Susceptibility Testing

Description: From introduction: The feasibility of using a near-field array for electromagnetic susceptibility testing is studied. The basic objective is to control the element weightings such that a plane wave is generated within the test volume. The basic theory is developed for arbitrary array geometries, and numerical results are obtained for finite planar arrays. A general near-field array synthesis technique is developed, and the technique minimizes the mean square error in the test volume while constraining the array excitations. The constraint prevents large excitations and is useful in minimizing the fields outside the test volume. The basic idea looks promising, but some practical considerations, such as bandwidth and angular scanning limitations, require further theoretical and experimental investigation.
Date: February 1984
Creator: Hill, D. A.
Partner: UNT Libraries Government Documents Department
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[Wyoming Uranium Evaluation] Volume 1: A Summary of the Geology and Uranium Potential of Precambrian Conglomerates in Southeastern Wyoming

Description: From deposit: Since 1975 a cooperative effort between the United States Department of Energy, United States Geological Survey, Geological Survey of Wyoming, the Geology Department, University of Wyoming, and various industry groups has resulted in the discovery of a series of uraniumthorium-and gold-bearing conglomerates in Late Archean and Early Proterozoic metasedimentary rocks of southern Wyoming. The mineral deposits were found by applying the time and strata bound model for the origin of uranium-bearing quartz-pebble conglomerates to favorable rock types within a geologic terrane known from prior regional mapping.
Date: February 1981
Creator: Karlstrom, Karl E.; Houston, Robert S.; Flurkey, Andrew J.; Coolidge, Carolyn M.; Kratochvil, Anthony L. & Sever, Cassandra K.
Partner: UNT Libraries Government Documents Department
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[Wyoming Uranium Evaluation] Volume 2: Drill-Hole Data, Drill-Site Geology, and Geochemical Data from the Study of Precambrian Uraniferous Conglomerates of the Medicine Bow Mountains and the Sierra Madre of Southeastern Wyoming

Description: From introduction: This volume is presented as a companion to Volume I: The Geology and Uranium Potential of Precambrian Conglomerates in the Medicine Bow Mountains and Sierra Madre of southeastern Wyoming; and to Volume 3: Uranium Assessment for Precambrian Pebble Conglomerates in Southeastern Wyoming. In Volume 1, we summarized the geologic setting and geologic and geochemical characteristics of uranium-bearing conglomerates in Precambrian metasedimentary rocks of southeastern Wyoming. Volume 3 is a geostatistical resource estimate of U and Th in quartz-pebble conglomerates. This volume contains supporting geochemical data, lithologic logs from 48 drill holes in Precambrian rocks of the Medicine Bow Mountains and Sierra Madre, and drill site geologic maps and cross-sections from most of the holes.
Date: February 1981
Creator: Karlstrom, Karl E.; Houston, Robert S.; Schmidt, Thomas G.; Inlow, David; Flurkey, Andrew J.; Kratochvil, Anthony L. et al.
Partner: UNT Libraries Government Documents Department
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Aerial Gamma Ray and Magnetic Survey: Rapid City Quadrangle of South Dakota, Final Report, Volume 1

Description: Final report documenting a high-sensitivity airborne radiometric and magnetic survey of the Rapid City quadrangle including the survey description, specifications, data processing methods, interpretation methods, and regional geologic review.
Date: February 1980
Creator: EG & G GeoMetrics
Partner: UNT Libraries Government Documents Department
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Airborne Gamma-Ray Spectrometer and Magnetometer Survey, Las Vegas Quadrangle (Arizona, California, Nevada), Williams Quadrangle (Arizona), Prescott Quadrangle (Arizona), and Kingman Quadrangle (Arizona, California, Nevada): Final Report, Volume 1

Description: This is an airborne reconnaissance report on several quadrangles in Arizona, California, and Nevada.
Date: February 1979
Creator: Western Geophysical Company of America. Aero Service Division.
Partner: UNT Libraries Government Documents Department
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Portland 1° x 2° NTMS Area, Maine and New Hampshire: Data Release

Description: From abstract: This data release presents preliminary results of ground water, stream sediment, and stream water reconnaissance in the National Topographic Map Series (NTMS) Portland 10 x 20 quadrangle. Stream sediment and stream water samples were collected from small streams at 1094 sites for a nominal density of one site per 13 square kilometers (five square miles) in rural areas. Ground water samples were collected at 560 sites for a nominal density of one site per 26 square kilometers (ten square miles). Neutron activation analysis (NAA) results are given for uranium and 16 other elements in sediments, and for uranium and 9 other elements in ground water and surface water. Field measurements and observations are reported for each site. Analytical data and field measurements are presented in tables and maps. Statistical summaries of data and a brief description of results are given. A generalized geologic map and a summary of the geology of the area are included.
Date: February 1979
Creator: Koller, G. R.
Partner: UNT Libraries Government Documents Department

Portland 1° x 2° NTMS Area, Maine and New Hampshire: Data Release, Plate 1-9

Description: Supplementary data containing a geologic-tectonic map of the Portland Quadrangle, in addition to mineral occurrences, sample site locations, and elemental distribution data to accompany a report on hydrogeochemical and stream sediment reconnaissance in Maine and New Hampshire.
Date: February 1979
Creator: Koller, G. R.
Partner: UNT Libraries Government Documents Department
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Uranium Hydrogeochemical and Stream Sediment Reconnaissance of the La Junta NTMS Quadrangle, Colorado, Including Concentrations of Forty-Three Additional Elements

Description: This report provides uranium and other elemental data resulting from the Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) of the La Junta quadrangle, Colorado.
Date: February 1979
Creator: Purson, John D. & Warren, Richard G.
Location: None
Partner: UNT Libraries Government Documents Department
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