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IN-VIVO DIAGNOSIS OF CHEMICALLY INDUCED MELANOMA IN AN ANIMAL MODEL USING UV-VISIBLE AND NIR ELASTIC SCATTERING SPECTROSCOPY: PRELIMINARY TESTING.
Elastic light scattering spectroscopy (ESS) has the potential to provide spectra that contain both morphological and chromophore information from tissue. We report on a preliminary study of this technique, with the hope of developing a method for diagnosis of highly-pigmented skin lesions, commonly associated with skin cancer. Four opossums were treated with dimethylbenz(a)anthracene to induce both malignant melanoma and benign pigmented lesions. Skin lesions were examined in vivo using both UV-visible and near infrared (NIR) ESS, with wavelength ranges of 330-900 nm and 900-1700 nm, respectively. Both portable systems used identical fiber-optic probe geometry throughout all of the measurements. The core diameters for illuminating and collecting fibers were 400 and 200 {micro}m, respectively, with center-to-center separation of 350 {micro}m. The probe was placed in optical contact with the tissue under investigation. Biopsies from lesions were analyzed by two standard histopathological procedures. Taking into account only the biopsied lesions, UV-visible ESS showed distinct spectral correlation for 11/13 lesions. The NIR-ESS correlated well with 12/13 lesions correctly. The results of these experiments showed that UV-visible and NIR-ESS have the potential to classify benign and malignant skin lesions, with encouraging agreement to that provided by standard histopathological examination. These initial results show potential …
Date:
January 1, 2001
Creator:
A'AMAR, C.; LEY, R. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
[Letter from Julie Abel to Phillip C. Diebel - January 26, 2001]
A letter to Phillip C. Diebel from Julie Abel regarding a grant check from the Getty Education Institute for the Arts to the North Texas Institute for Educators in the Visual Arts (NTIEVA).
Date:
January 26, 2001
Creator:
Abel, Julie A.
Object Type:
Letter
System:
The UNT Digital Library
[Abilene City Council Minutes: 2001]
Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 11, 2001 to December 20, 2001.
Date:
2001-01-11/2001-12-20
Creator:
Abilene (Tex.)
Object Type:
Book
System:
The Portal to Texas History
Abilene Philharmonic Playbill: January 27-February 24, 2001
Program for an Abilene Philharmonic concert that ran from January 27th to February 24th (classical concerts) during the 50th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
January 2001
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Abilene Philharmonic Ticket
Ticket for an Abilene Philharmonic concert titled "Viennese Connection"on Saturday, January 27, 2001 at the Abilene Civic Center.
Date:
January 2001
Creator:
Abilene Philharmonic
Object Type:
Text
System:
The Portal to Texas History
Abilene Philharmonic Ticket 2
Ticket for an Abilene Philharmonic concert titled "Viennese Connection"on Saturday, January 27, 2001 at the Abilene Civic Center.
Date:
January 2001
Creator:
Abilene Philharmonic
Object Type:
Text
System:
The Portal to Texas History
Aberturas del dosel y espectro de la luz en el sotobosque de una selva nublada andina de Venezuela
Article on canopy gaps and understory light spectrum in a Venezuelan Andean cloud forest.
Date:
January 2001
Creator:
Acevedo, Miguel F.; Monteleone, Susan; Ataroff, Michele & Estrada, Carlos A.
Object Type:
Article
System:
The UNT Digital Library
Global Climate Change: Selected Legal Questions About the Kyoto Protocol
This report addresses legal issues after the United States signed the Kyoto Protocol to the UnitedNations Framework Convention on Climate Change. The protocol is not yet in effect internationally and cannot be legally binding on the U.S. unless and until the Senate gives its advice and consent.
Date:
January 10, 2001
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
Mass Sensor
The purpose of this CRADA was to use Honeywell's experience in low temperature cofire ceramics and traditional ceramics to assemble a relatively low-cost, mass-producible miniature mass analyzer. The specific design, given to us by Mass Sensors, LLC, was used to test for helium. The direct benefit for the participant was to have a prototype unit assembled for the purpose of proof of concept and the ability to secure venture capital investors. From that, the company would begin producing their own product for sale. The consumer/taxpayer benefits come from the wide variety of industries that can utilize this technology to improve quality of life. Medical industry can use this technology to improve diagnostic ability; manufacturing industry can use it for improved air, water, and soil monitoring to minimize pollution; and the law enforcement community can use this technology for identification of substances. These are just a few examples of the benefit of this technology. The benefits to DOE were in the area of process improvement for cofire and ceramic materials. From this project we demonstrated nonlinear thickfilm fine lines and spaces that were 5-mil wide with 5-mil spaces; determined height-to diameter-ratios for punched and filled via holes; demonstrated the ability to …
Date:
January 18, 2001
Creator:
Adams, B.E.
Object Type:
Report
System:
The UNT Digital Library
Quarterly Progress Report - Biological Monitoring Program for East Fork Poplar Creek
In May 1985, a National Pollutant Discharge Elimination System (NPDES) permit was issued for the Oak Ridge Y-12 National Security Complex (formerly the Oak Ridge Y-12 Plant). As a condition of the permit, a Biological Monitoring and Abatement Program (BMAP) was developed to demonstrate that the effluent limitations established for the Y-12 Complex protect the classified uses of the receiving stream (East Fork Poplar Creek; EFPC), in particular, the growth and propagation of aquatic life (Loar et al. 1989). A second objective of the BMAP is to document the ecological effects resulting from the implementation of a water pollution control program designed to eliminate direct discharges of wastewaters to EFPC and to minimize the inadvertent release of pollutants to the environment. Because of the complex nature of the discharges to EFPC and the temporal and spatial variability in the composition of the discharges, a comprehensive, integrated approach to biological monitoring was developed. A new permit was issued to the Y-12 Complex on April 28, 1995 and became effective on July 1, 1995. Biological monitoring continues to be required under the new permit. The BMAP consists of four major tasks that reflect different but complementary approaches to evaluating the effects of …
Date:
January 19, 2001
Creator:
Adams, S. M.; Christensen, S. W.; Greeley, M. S. Jr.; McCracken, M. K.; Peterson, M. J.; Ryon, M. G. et al.
Object Type:
Report
System:
The UNT Digital Library
Erosive wear of selected materials for fossil energy applications
A number of materials have been evaluated to determine their erosion resistance for fossil energy applications. This is part of a larger program to study wear and corrosion at Albany Research Center. This paper will present the results for some of these materials, including FeAl, FeAl cermets, WC-Co cemented carbides, Si3N4-MoSi2, Si3N4, Stellite 6B, white cast irons and 440C steel. Trends in erosion rates due to material properties and erosive conditions will be presented. FeAl cermets performed well compared to the WC-Co cemented carbides. The interparticle spacing of the WC-Co cemented carbides correlated with the erosion rate. The erosion rate of the WC-Co cemented carbides decreased as the interparticle spacing decreased. It is important to realize that erosion resistance is not an intrinsic material property, but is a system response. A change in the wear environment can significantly alter the relative rankings of materials with respect to their wear rate. For example, at relatively low velocities, the carbides in the white cast irons are more erosion resistant than the matrix, while at higher velocities the matrix is more erosion resistant.
Date:
January 1, 2001
Creator:
Adler, Thomas A.; Rawers, James C.; Tylczak, Joseph H. & Hawk, Jeffrey A.
Object Type:
Article
System:
The UNT Digital Library
Systems Requirement Document for the MSRE U-233 Conversion System
The fissile material reclamation activities for the MSRE remediation project include the removal and recovery of uranium from the off-gas system, from the stored fuel salt, and finally, from the uranium-laden charcoal in the Auxiliary Charcoal Bed (ACB). Each of these operations produces an uranium/fluoride compound that is not suitable for long-term storage. The uranium-fluoride compounds can be stored for a limited period of time in pressure vessels. The interim-storage vessels are designed to handle the internal pressure buildup from gases formed by radiolysis of the uranium-fluoride compounds. The conversion process will take the pressurized vessels from interim storage and process the materials in a hot cell located at Building 4501. The gas in the vessels will be vented through chemical traps and then the traps will be processed to convert the various uranium-fluoride compounds to a stable uranium oxide form. This will be done one trap at a time. The chemical form of uranium being extracted from the off-gas system and from fuel salt fluorination process is uranium hexafluoride UF{sub 6}. During the operations at MSRE, the UF{sub 6} is chemisorbed onto sodium fluoride (NaF) traps where it forms the complex, 2NaF{center_dot}UF{sub 6}. The conversion process that will be …
Date:
January 11, 2001
Creator:
Aigner, R. D.
Object Type:
Report
System:
The UNT Digital Library
Neutronics Benchmarks for the Utilization of Mixed-Oxide Fuel: Joint U.S./Russian Progress Report for Fiscal Year 1997
In 1967, a series of critical experiments were conducted at the Westinghouse Reactor Evaluation Center (WREC) using mixed-oxide (MOX) PuO{sub 2}-UO{sub 2} and/or UO{sub 2} fuels in various lattices and configurations . These experiments were performed under the joint sponsorship of the Empire State Atomic Development Associates (ESADA) plutonium program and Westinghouse . The purpose of these experiments was to develop experimental data to validate analytical methods used in the design of a plutonium-bearing replacement fuel for water reactors. Three different fuels were used during the experimental program: two MOX fuels and a low-enriched UO{sub 2} fuel. The MOX fuels were distinguished by their {sup 240}Pu content: 8 wt% {sup 240}Pu and 24 wt% {sup 240}Pu. Both MOX fuels contained 2.0 wt % PuO{sub 2} in natural UO{sub 2} . The UO{sub 2} fuel with 2.72 wt % enrichment was used for comparison with the plutonium data and for use in multiregion experiments.
Date:
January 11, 2001
Creator:
Akkurt, H
Object Type:
Report
System:
The UNT Digital Library
An inter-realm, cyber-security infrastructure for virtual supercomputing
Virtual supercomputing, (ise ., high-performance grid computing), is poised to revolutionize the way we think about and use computing. However, the security of the links interconnecting the nodes within such an environment will be its Achilles heel, particularly when secure communication is required to tunnel through heterogeneous domains. In this paper we examine existing security mechanisms, show their inadequacy, and design a comprehensive cybersecurity infrastructure that meets the security requirements of virtual supercomputing. Keywords Security, virtual supercomputing, grid computing, high-performance computing, GSS-API, SSL, IPsec, component-based software, dynamic reconfiguration.
Date:
January 1, 2001
Creator:
Al-Muhtadi, J. (Jalal); Feng, W. C. (Wu-Chun) & Fisk, M. E. (Mike E. )
Object Type:
Article
System:
The UNT Digital Library
The Deposition and Characterization of Mo/CuInGaSe2/CdS/ZnO Solar Cells
Mo thin films were deposited on sodalime glass (SLG) substrates using direct-current planar magnetron sputtering, with a sputtering power density of 1.18 W/cm2. The working gas (Ar) pressure was varied from 0.6 mtorr to 16 mtorr to gain a better understanding of the effect of sputtering pressure on the morphology and microstructure of the Mo. Thin films of Cu(In,Ga)Se2 (CIGS) were deposited on the Mo-coated glass using the 3-stage coevaporation process. The morphology of both the Mo-coated SLG and the CIGS thin films grown on it was examined using high-resolution scanning electron microscopy. The film microstructure, such as the preferred orientation, and the residual intrinsic stress were examined by X-ray diffraction.
Date:
January 2001
Creator:
Al-Thani, Hamda A.; Hasoon, Falah S.; Alleman, Jeff L.; Al-Jassim, Mowafak M. & Williamson, Don L.
Object Type:
Article
System:
The UNT Digital Library
A Parallel Multigrid Method for Neutronics Applications
The multigrid method has been shown to be the most effective general method for solving the multi-dimensional diffusion equation encountered in neutronics. This being the method of choice, we develop a strategy for implementing the multigrid method on computers of massively parallel architecture. This leads us to strategies for parallelizing the relaxation, contraction (interpolation), and prolongation operators involved in the method. We then compare the efficiency of our parallel multigrid with other parallel methods for solving the diffusion equation on selected problems encountered in reactor physics.
Date:
January 1, 2001
Creator:
Alcouffe, Raymond E.
Object Type:
Article
System:
The UNT Digital Library
Radiation-induced demagnetization of Nd-Fe-B permanent magnets.
None
Date:
January 23, 2001
Creator:
Alderman, J.; Job, P. K.; Martin, R. C.; Simmons, C. M.; Owen, G. D. & Puhl, J.
Object Type:
Report
System:
The UNT Digital Library
Algorithm refinement for stochastic partial differential equations.
A hybrid particle/continuum algorithm is formulated for Fickian diffusion in the fluctuating hydrodynamic limit. The particles are taken as independent random walkers; the fluctuating diffusion equation is solved by finite differences with deterministic and white-noise fluxes. At the interface between the particle and continuum computations the coupling is by flux matching, giving exact mass conservation. This methodology is an extension of Adaptive Mesh and Algorithm Refinement to stochastic partial differential equations. A variety of numerical experiments were performed for both steady and time-dependent scenarios. In all cases the mean and variance of density are captured correctly by the stochastic hybrid algorithm. For a non-stochastic version (i.e., using only deterministic continuum fluxes) the mean density is correct, but the variance is reduced except within the particle region, far from the interface. Extensions of the methodology to fluid mechanics applications are discussed.
Date:
January 1, 2001
Creator:
Alexander, F. J. (Francis J.); Garcia, Alejandro L., & Tartakovsky, D. M. (Daniel M.)
Object Type:
Article
System:
The UNT Digital Library
Characterization of the proton beam at the output of the 6.7MeV LEDA RFQ.
The present configuration of the Low-Energy Demonstration Accelerator (LEDA) consists of a 75-keV proton injector, a 6.7-MeV 350-MHz cw radio-frequency quadrupole (RFQ) with associated high-power and lowlevel rf systems, a 52-magnet periodic lattice followed by a short high-energy beam transport (HEBT) and highpower (670-kW cw) beam stop. The rms beam emittance was measured prior to the installation of the 52-magnet lattice, based on wire-scanner measurements of the beam profile at a single location in the HEBT. New measurements with additional diagnostic hardware have been performed to determine the rms transverse beam properties of the beam at the output of the 6.7-MeV LEDA RFQ. The 52-magnet periodic lattice also includes ten beam position monitors (BPMs) evenly spaced in pairs of two. The BPMs provide a measure of the bunched beam current that exhibits nulls at different locations in the lattice. Model predictions of the locations of the nulls and the strength of the bunched beam current are made to determine what information this data can provide regarding the longitudinal beam emittance.
Date:
January 1, 2001
Creator:
Allen, C. K. (Christopher K.); Colestock, P. L. (Patrick L.),; Gilpatrick, J. D. (John Douglas); Lysenko, W. P. (Walter P.); Rybarcyk, L. J. (Lawrence J.); Schneider, J. D. (J. David) et al.
Object Type:
Article
System:
The UNT Digital Library
Bioremediation of Petroleum Hydrocarbon-Contaminated Soils, Comprehensive Report
The US Department of Energy and the Institute for Ecology of Industrial Areas, Katowice, Poland have been cooperating in the development and implementation of innovative environmental remediation technologies since 1995. U.S. experts worked in tandem with counterparts from the IETU and CZOR throughout this project to characterize, assess and subsequently, design, implement and monitor a bioremediation system.
Date:
January 12, 2001
Creator:
Altman, D. J.
Object Type:
Report
System:
The UNT Digital Library
Novel Fluorine-Containing NMDA Antagonists for Brain Imaging: In Vitro Evaluation
The NMDA receptor has been implicated in neuronal death following stroke, brain injury and neurodegenerative disorders (e.g. Alzheimer's, Parkinson's and Huntington's disease) and in physiological functions (e.g. memory and cognition). Non-competitive antagonists, such as MK- 801 and CNS-1102, that block the action of glutamate at the NMDA receptor have been shown to be neuroprotective by blocking the influx of calcium into the cells. As a result, they are being considered as therapeutic agents for the above mentioned diseases. Several Fluorine-containing novel analogs of NMDA channel blockers have been synthesized and evaluated in search of a compound suitable for 18F labeling and Positron Emission Tomography (PET). Based on in vitro binding assay studies on rat brain membranes, the novel compounds examined displayed a range of affinities. Preliminary analyses indicated that chlorine is the best halogen on the ring, and that ethyl fluoro derivatives are more potent than methyl-fluoro compounds. Further analysis based on autoradiography will be needed to examine the regional binding characteristics of the novel compounds examined in this study. Labeling with 18F will allow the use of these compounds in humans, generating new insights into mechanisms and treatment of diseases involving malfunction of the glutamatergic system in the brain.
Date:
January 1, 2001
Creator:
Alvarado, M. & Biegon, A.
Object Type:
Article
System:
The UNT Digital Library
Membership of the 107th Congress: A Profile
None
Date:
January 10, 2001
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Southwest Retort, Volume 53, Number 5, January 2001
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
January 2001
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Predictive model of nucleon-nucleus scattering cross sections
Nucleon total reaction and neutron total cross sections as well as differential (including spin) observables from 25 to 300 MeV for stable nuclei from 6Li to 238U have been predicted that are in good agreement with measured data. Those predictions have been made using non-local, energy dependent, and complex optical potentials in coordinate space formed by full folding of effective nucleon-nucleon interactions with realistic nuclear ground state densities. By inverse kinematics the same model prescription describes exotic (radioactive) nuclei scattering from hydrogen as a target and the results reveal the extended (neutron) distributions such nuclei can have.
Date:
January 1, 2001
Creator:
Amos, K. (Ken); Deb, P. (Pradip); Karataglidis, S. (Steven) & Madland, D. G.
Object Type:
Article
System:
The UNT Digital Library