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461 Matching Results
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General, Closed-Form Expressions for the Time-Domain Surface Impedances of a Homogeneous, Lossy Half-Space
The radio channel places fundamental limitations on the performance of wireless communication systems in tunnels and caves. The transmission path between the transmitter and receiver can vary from a simple direct line of sight to one that is severely obstructed by rough walls and corners. Unlike wired channels that are stationary and predictable, radio channels can be extremely random and difficult to analyze. In fact, modeling the radio channel has historically been one of the more challenging parts of any radio system design; this is often done using statistical methods. The mechanisms behind electromagnetic wave propagation are diverse, but can generally be attributed to reflection, diffraction, and scattering. Because of the multiple reflections from rough walls, the electromagnetic waves travel along different paths of varying lengths. The interactions between these waves cause multipath fading at any location, and the strengths of the waves decrease as the distance between the transmitter and receiver increases. As a consequence of the central limit theorem, the received signals are approximately Gaussian random process. This means that the field propagating in a cave or tunnel is typically a complex-valued Gaussian random process.
Date:
January 28, 2004
Creator:
Pao, H; Zhu, Z & Dvorak, S L
Object Type:
Article
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 108, No. 29, Ed. 1 Wednesday, January 28, 2004
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
January 28, 2004
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
HIV/AIDS International Programs: Appropriations, FY2002-FY2004
None
Date:
January 28, 2004
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
Internet: Status Report on Legislative Attempts to Protect Children from Unsuitable Material on the Web
None
Date:
January 28, 2004
Creator:
Smith, Marcia S. & Jacobs, Amanda
Object Type:
Report
System:
The UNT Digital Library
An Iterative Phase-Space Explicit Discontinuous Galerkin Method for Stellar Radiative Transfer in Extended Atmospheres
A phase-space discontinuous Galerkin (PSDG) method is presented for the solution of stellar radiative transfer problems. It allows for greater adaptivity than competing methods without sacrificing generality. The method is extensively tested on a spherically symmetric, static, inverse-power-law scattering atmosphere. Results for different sizes of atmospheres and intensities of scattering agreed with asymptotic values. The exponentially decaying behavior of the radiative field in the diffusive-transparent transition region and the forward peaking behavior at the surface of extended atmospheres were accurately captured. The integrodifferential equation of radiation transfer is solved iteratively by alternating between the radiative pressure equation and the original equation with the integral term treated as an energy density source term. In each iteration, the equations are solved via an explicit, flux-conserving, discontinuous Galerkin method. Finite elements are ordered in wave fronts perpendicularly to the characteristic curves so that elemental linear algebraic systems are solved quickly by sweeping the phase space element by element. Two implementations of a diffusive boundary condition at the origin are demonstrated wherein the finite discontinuity in the radiative intensity is accurately captured by the proposed method. This allows for a consistent mechanism to preserve photon luminosity. The method was proved to be robust and …
Date:
January 28, 2004
Creator:
de Almeida, V.F.
Object Type:
Report
System:
The UNT Digital Library
Liquefied Natural Gas (LNG) Import Terminals: Siting, Safety and Regulation
None
Date:
January 28, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Mannford Eagle (Mannford, Okla.), Vol. 22, No. 39, Ed. 1 Wednesday, January 28, 2004
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 28, 2004
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Manufacturing Extension Partnership Program: An Overview
This report provides a brief overview of The Hollings Manufacturing Partnership (MEP), which is a program of regional centers set up to assist small and medium-sized manufacturing companies use knowledge and technologies developed under the auspices of the National Institute of Standards and Technology (NIST).
Date:
January 28, 2004
Creator:
Schacht, Wendy H.
Object Type:
Report
System:
The UNT Digital Library
McMurry University, The War Whoop (Abilene, Tex.), Vol. 80, No. 7, Ed. 1, Wednesday, January 28, 2004
Weekly student newspaper from McMurry University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
January 28, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Measurement of The Magnetic Field in a Spherical Torus Plasma via Electron Bernstein Wave Emission Harmonic Overlap Measurement of The Magnetic Field in a Spherical Torus Plasma via Electron Bernstein Wave Emission Harmonic Overlap
Measurement of the magnetic field in a spherical torus by observation of harmonic overlap frequencies in the electron Bernstein wave (EBW) spectrum has been previously suggested [V.F. Shevchenko, Plasma Phys. Reports 26 (2000) 1000]. EBW mode conversion to X-mode radiation has been studied in the Current Drive Experiment-Upgrade spherical torus, [T. Jones, Ph.D. thesis, Princeton University, 1995] with emission measured at blackbody levels [B. Jones et al., Phys. Rev. Lett. 90 (2003) article no. 165001]. Sharp transitions in the thermally emitted EBW spectrum have been observed for the first two harmonic overlaps. These transition frequencies are determined by the magnetic field and electron density at the mode conversion layer in accordance with hot-plasma wave theory. Prospects of extending this measurement to higher harmonics, necessary in order to determine the magnetic field profile, and high beta equilibria are discussed for this proposed magnetic field diagnostic.
Date:
January 28, 2004
Creator:
Jones, B.; Taylor, G.; Efthimion, P. C. & Munsat, T.
Object Type:
Report
System:
The UNT Digital Library
Measurement of the radiation field surrounding the Collider Detector at Fermilab
We present here the first direct and detailed measurements of the spatial distribution of the ionizing radiation surrounding a hadron collider experiment. Using data from two different exposures we measure the effect of additional shielding on the radiation field around the Collider Detector at Fermilab (CDF). Employing a simple model we parameterize the ionizing radiation field surrounding the detector.
Date:
January 28, 2004
Creator:
al., K. Kordas et
Object Type:
Article
System:
The UNT Digital Library
The Mercedes Enterprise (Mercedes, Tex.), Vol. 92, No. 4, Ed. 1 Wednesday, January 28, 2004
Weekly newspaper from Mercedes, Texas that includes local, state, and national news along with advertising.
Date:
January 28, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Military Pay: Army National Guard Personnel Mobilized to Active Duty Experienced Significant Pay Problems
Testimony issued by the General Accounting Office with an abstract that begins "In light of the recent mobilizations associated with the war on terrorism, GAO was asked to determine if controls used to pay mobilized Army Guard personnel provided assurance that such pays were accurate and timely. This testimony focuses on the pay experiences of Army Guard soldiers at selected case study units and deficiencies with respect to controls over processes, human capital, and automated systems."
Date:
January 28, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Modeling reactive geochemical transport of concentrated aqueous solutions in variably saturated media
Concentrated aqueous solutions (CAS) have unique thermodynamic and physical properties. Chemical components in CAS are incompletely dissociated, especially those containing divalent or polyvalent ions. The problem is further complicated by the interaction between CAS flow processes and the naturally heterogeneous sediments. As the CAS migrates through the porous media, the composition may be altered subject to fluid-rock interactions. To effectively model reactive transport of CAS, we must take into account ion-interaction. A combination of the Pitzer ion-interaction and the ion-association model would be an appropriate way to deal with multiple-component systems if the Pitzer' parameters and thermodynamic data of dissolved components and the related minerals are available. To quantify the complicated coupling of CAS flow and transport, as well as the involved chemical reactions in natural and engineered systems, we have substantially extended an existing reactive biogeochemical transport code, BIO-CORE{sup 2D}{copyright}, by incorporating a comprehensive Pitzer ion-interaction model. In the present paper, the model, and two test cases against measured data were briefly introduced. Finally we present an application to simulate a laboratory column experiment studying the leakage of the high alkaline waste fluid stored in Hanford (a site of the U.S. Department of Energy, located in Washington State, USA). …
Date:
January 28, 2004
Creator:
Zhang, Guoxiang; Zheng, Zuoping & Wan, Jiamin
Object Type:
Article
System:
The UNT Digital Library
Neutron Skyshine Considerations For The NIF Shielding Design
A series of coupled neutron-photon transport Monte-Carlo calculations was performed to estimate the roof shielding required to limit the skyshine dose to less than 1 mrem/y at the site boundary when conducting DT experiments with annual fusion yields up to 1200 MJ (4.2E20 neutrons/y). The NIF shielding design consists of many different components. The basic components include 10-cm-thick Al chamber with 40-cm-thick target chamber gunite shield having multiple penetrations, 1.83-m-thick concrete Target Bay walls, 1.37-m-thick concrete roof, and multiple concrete floors with numerous penetrations. Under this shielding configuration, the skyshine dose at the nearest site-boundary was calculated to be less than 0.2 mrem/y for all possible target illumination configurations. The potential dose at the site boundary would be about one-tenth of the cosmic neutron dose that we measured with bubble neutron detectors on board a commercial roundtrip flight from SF to Rochester. This incremental dose increase is well within the normal fluctuations (noise) of the natural background radiation in the Livermore area. The skyshine dose has no impact on the public. The skyshine dose trends at ground and elevated levels are plotted as a function of distance from 20 m to 1000 m from the center of the target bay. …
Date:
January 28, 2004
Creator:
Singh, M S; Mecozzi, J M & Tobin, M T
Object Type:
Article
System:
The UNT Digital Library
NIF Final Optics System: Frequency Conversion and Beam Conditioning
Installation and commissioning of the first of forty-eight Final Optics Assemblies on the National Ignition Facility was completed this past year. This activity culminated in the delivery of first light to a target. The final optics design is described and selected results from first-article commissioning and performance tests are presented.
Date:
January 28, 2004
Creator:
Wegner, P.; Auerbach, J.; Biesiada, T.; Dixit, S.; Lawson, J.; Menapace, J. et al.
Object Type:
Article
System:
The UNT Digital Library
North Texas Daily (Denton, Tex.), Vol. 88, No. 65, Ed. 1 Wednesday, January 28, 2004
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
January 28, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The "Nuclear Car Wash": A Scanner to Detect Illicit Special Nuclear Material in Cargo Containers
There is an urgent need to improve the reliability of screening cargo containers for illicit nuclear material that may be hidden there for terrorist purposes. A screening system is described for detection of fissionable material hidden in maritime cargo containers. The system makes use of a low intensity neutron beam for producing fission; and the detection of the abundant high-energy {gamma} rays emitted in the {beta}-decay of short-lived fission products and {beta}-delayed neutrons. The abundance of the delayed {gamma} rays is almost an order of magnitude larger than that of the delayed neutrons normally used to detect fission and they are emitted on about the same time scale as the delayed neutrons, i.e., {approx}1 min. The energy and temporal distributions of the delayed {gamma} rays provide a unique signature of fission. Because of their high energy, these delayed {gamma} rays penetrate low-Z cargoes much more readily than the delayed neutrons. Coupled with their higher abundance, the signal from the delayed {gamma} rays escaping from the container is predicted to be as much as six decades more intense than the delayed neutron signal, depending upon the type and thickness of the intervening cargo. The {gamma} rays are detected in a large …
Date:
January 28, 2004
Creator:
Slaughter, D. R.; Accatino, M. R.; Bernstein, A.; Dougan, A. D.; Hall, J. M.; Loshak, A. et al.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 87, No. 91, Ed. 1 Wednesday, January 28, 2004
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 28, 2004
Creator:
King, Christopher R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Optimist (Abilene, Tex.), Vol. 92, No. 31, Ed. 1, Wednesday, January 28, 2004
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
January 28, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Peter Hammersen, January 28, 2004
The National Museum of the Pacific War presents an interview with Peter Hammersen. Hammersen was born at the end of WWI and grew up in California. While going to school for premed in Pasadena, Hammersen joined the California Army National Guard and became a charter member of Company A, 115th Medical Regiment. He worked as a surgical technician in various hospitals until he was assigned to the 48th Station Hospital at Vila, Efate, and later to Henderson Field at Guadalcanal and finally to the 37th Portable Surgical Hospital in New Guinea. Hammersen shares a number of anecdotal stories.
Date:
January 28, 2004
Creator:
Hammersen, Peter
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Peter Hammersen, January 28, 2004
The National Museum of the Pacific War presents an interview with Peter Hammersen. Hammersen was born at the end of WWI and grew up in California. While going to school for premed in Pasadena, Hammersen joined the California Army National Guard and became a charter member of Company A, 115th Medical Regiment. He worked as a surgical technician in various hospitals until he was assigned to the 48th Station Hospital at Vila, Efate, and later to Henderson Field at Guadalcanal and finally to the 37th Portable Surgical Hospital in New Guinea. Hammersen shares a number of anecdotal stories.
Date:
January 28, 2004
Creator:
Hammersen, Peter
Object Type:
Text
System:
The Portal to Texas History
The Panola Watchman (Carthage, Tex.), Vol. 131, No. 8, Ed. 1 Wednesday, January 28, 2004
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
January 28, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Pawhuska Journal-Capital (Pawhuska, Okla.), Vol. 96, No. 4, Ed. 1 Wednesday, January 28, 2004
Weekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 28, 2004
Creator:
Gann, Sherry
Object Type:
Newspaper
System:
The Gateway to Oklahoma History