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A multi-wavelength scattered light analysis of the dust grain population in the GG Tau circumbinary ring
We present the first 3.8 {micro}m image of the dusty ring surrounding the young binary system GG Tau, obtained with the W. M. Keck II 10m telescope's adaptive optics system. THis is the longest wavelength at which the ring has been detected in scattered light so far, allowing a multi-wavelength analysis of the scattering proiperties of the dust grains present in this protoplanetary disk in combination with previous, shorter wavelengths, HST images. We find that the scattering phase function of the dust grains in the disk is only weakly dependent on the wavelength. This is inconsistent with dust models inferred from observations of the interstellar medium or dense molecular clouds. In particular, the strongly forward-throwing scattering phase function observed at 3.8 {micro}m implies a significant increase in the population of large ({approx}> 1 {micro}m) grains, which provides direct evidence for grain growth in the ring. However, the grain size distribution required to match the 3.8 {micro}m image of the ring is incompatible with its published 1 {micro}m polarization map, implying that the dust population is not uniform throughout the ring. We also show that our 3.8 {micro}m image of the ring is incompatible with its published 1 {micro}m polarization map, …
Date:
February 4, 2004
Creator:
Duchene, G; McCabe, C; Ghez, A & Macintosh, B
Object Type:
Article
System:
The UNT Digital Library
Agricultural Biotechnology: Overview and Selected Issues
This report considers the issues surrounding genetically engineered (GE) crops or GMO's (genetically modified organisms). Moreover, the report debates the consequences of GE crops on the environment, food safety, and labeling. The report also debates the merits of regulation on the market the crops have entered.
Date:
June 4, 2004
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Results from Boiling Temperature Measurements for Saturated Solutions in the Systems NaCl + KNO{sub 3} + H{sub 2}O, NaNO{sub 3} + KNO{sub 3} + H{sub 2}O, and NaCl + NaNO{sub 3} + KNO{sub 3} + H{sub 2}O
Boiling temperature measurements have been made for saturated ternary solutions of NaCl + KNO{sub 3} + H{sub 2}O and NaNO{sub 3} + KNO{sub 3} + H{sub 2}O over the full solute mole fraction range, along with the limiting binary solutions NaCl + H{sub 2}O, NaNO{sub 3} + H{sub 2}O, and KNO{sub 3} + H{sub 2}O. Boiling temperatures have also been measured for the quaternary NaCl + NaNO{sub 3} + KNO{sub 3} + H{sub 2}O mixtures with KNO{sub 3}:NaNO{sub 3} mole ratios of 1.01 and 1.19, which corresponding to the eutectic ratio and a near-eutectic ratio for the NaNO{sub 3} + KNO{sub 3} + H{sub 2}O subsystem. The maximum boiling temperature found for the NaCl + KNO{sub 3} + H{sub 2}O system is 134 C and for the NaNO{sub 3} + KNO{sub 3} + H{sub 2}O system is 160 C, but boiling temperatures as high as 196 C were measured the NaCl + NaNO{sub 3} + KNO{sub 3} + H{sub 2}O system. These mixture compositions correspond to the major mineral assemblages that are predicted to control the deliquescence relative humidity of salts found by leaching dust samples from the proposed nuclear repository at Yucca Mountain, Nevada.
Date:
October 4, 2004
Creator:
Rard, J A
Object Type:
Report
System:
The UNT Digital Library
Critical Soil-Structure Interaction Analysis Considerations for Seismic Qualification of Safety Equipment
While developing seismic analysis models for buildings that support safety-related equipment, a number of issues should be considered to ensure that the input motions for performing seismic qualification of safety-related equipment are properly defined. These considerations are listed and discussed here with special attention to the effect and importance of the interaction among the foundation soil, the building structure, the equipment anchors, and the equipment structure. Typical industry practices are critically examined to assess their adequacy for determining the input motions for equipment seismic qualification. The features that are considered essential in a soil-structure interaction (SSI) model are described. Also, the effects of inappropriate treatment or representation of these features are discussed.
Date:
March 4, 2004
Creator:
Hossain, Q A
Object Type:
Article
System:
The UNT Digital Library
Spatially Continuous Mixed P2-P1 Solutions for Planar Geometry
Even-order Legendre polynomial (P{sub N}) expansion approximations of the neutron transport equation have historically seen only limited practical application. Research in the last decade has resolved one of the historical theoretical objections to the use of even-order PN approximations in planar geometry, namely the ambiguity in the prescription of boundary conditions as a result of an odd number of unknowns. This research also demonstrated the P{sub 2} approximation to be more accurate than the P{sub 1} approximation in planar geometry away from boundary layers and material interfaces. Neither the P{sub 1} nor the P{sub 2} approximation is convincingly more accurate near material interfaces. This progress motivated the reexamination of the multidimensional simplified P{sub 2} (SP{sub 2}) approximation, the development of P{sub 2} approximations for planar geometry stochastic transport problems, and the examination of the P{sub 2} and SP{sub 2} approximations as a synthetic acceleration technique for the discrete ordinates equations. The major remaining objection to even-order PN approximations is that the scalar flux distributions obtained using these approximations can exhibit large spatial discontinuities at material interfaces and source discontinuities. In contrast, the odd-order PN approximations typically utilized give spatially continuous scalar flux distributions at these locations. In this paper, we …
Date:
June 4, 2004
Creator:
Brantley, P S
Object Type:
Article
System:
The UNT Digital Library
Structure and Composition of Cu Doped CdSe Nanocrystals Using Soft X-ray Absorption Spectroscopy
The local structure and composition of Cu ions dispersed in CdSe nanocrystals is examined using soft x-ray absorption near edge spectroscopy (XANES). Using Cu L-edge XANES and X-ray photoelectron measurements (XPS), we find that the Cu ions exist in the Cu(I) oxidation state. We also find that the observed Cu L-edge XANES signal is directly proportional to the molar percent of Cu present in our final material. Se L-edge XANES indicates changes in the Se density of states with Cu doping, due to a chemical bonding effect, and supports a statistical doping mechanism. Photoluminescence (PL) measurements indicate the Cu ions may act as deep electron traps. We show that XANES, XPS, and PL are a powerful combination of methods to study the electronic and chemical structure of dopants in nanostructured materials.
Date:
June 4, 2004
Creator:
Meulenberg, R W; van Buuren, T; Hanif, K M; Willey, T M; Strouse, G F & Terminello, L J
Object Type:
Article
System:
The UNT Digital Library
ELMs and the H-Mode Pedestal in NSTX
We report on the behavior of ELMs in NBI-heated H-mode plasmas in NSTX. It is observed that the size of Type I ELMs, characterized by the change in plasma energy, decreases with increasing density, as observed at conventional aspect ratio. It is also observed that the Type I ELM size decreases as the plasma equilibrium is shifted from a symmetric double-null toward a lower single-null configuration. Type III ELMs have also been observed in NSTX, as well as a high-performance regime with small ELMs which we designate Type V. These Type V ELMs are consistent with high bootstrap current operation and density approaching Greenwald scaling. The Type V ELMs are characterized by an intermittent n=1 MHD mode rotating counter to the plasma current. Without active pumping, the density rises continuously through the Type V phase. However, efficient in-vessel pumping should allow density control, based on particle containment time estimates.
Date:
June 4, 2004
Creator:
Maingi, R.; Sabbagh, S.; Bush, C.; Fredrickson, E.; Menard, J.; Stutman, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Laser Performance Operations Model (LPOM)
The Laser Performance Operations Model (LPOM) has been developed to provide real time predictive capabilities for the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. LPOM uses diagnostic feedback from previous NIF shots to maintain accurate energetics models for each of the 192 NIF beamlines (utilizing one CPU per laser beamline). This model is used to determine the system setpoints (initial power, waveplate attenuations, laser diagnostic settings) required for all requested NIF shots. In addition, LPOM employs optical damage models to minimize the probability that a proposed shot may damage the system. LPOM provides post-shot diagnostic reporting to support the NIF community. LPOM was deployed prior to the first main laser shots in NIF, and has since been used to set up every shot in NIF's first quad (four beamlines). Real-time adjustments of the codes energetics parameters allows the LPOM to predict total energies within 5%, and provide energy balance within the four beamlines to within 2% for shots varying from 0.5 to 26 kJ (1.053 {micro}m) per beamline. The LPOM has been a crucial tool in the commissioning of the first quad of NIF.
Date:
June 4, 2004
Creator:
Shaw, M; Williams, W; House, R & Haynam, C
Object Type:
Article
System:
The UNT Digital Library
Identification of Minerals and Meteoritic Materials via Raman Techniques After Capture in Hypervelocity Impacts on Aerogel
For this study, an extensive suite of mineral particles analogous to components of cosmic dust were tested to determine if their Raman signatures can be recognized after hypervelocity capture in aerogel. The mineral particles were mainly of greater than 20 micrometers in size and were accelerated onto the silica aerogel by light gas gun shots. It was found that all the individual minerals captured in aerogel could be subsequently identified using Raman (or fluorescent) spectra. The beam spot size used for the laser illumination was of the order of 5 micrometers, and in some cases the captured particles were of a similar small size. In some samples fired into aerogel there was observed a shift in the wavenumbers of some of the Raman bands, a result of the trapped particles being at quite high temperatures due to heating by the laser. Temperatures of samples under laser illumination were estimated from the relative intensities of Stokes and anti-Stokes Raman bands, or, in the case of ruby particles, from the wavenumber of fluorescence bands excited by the laser. It was found that the temperature of particles in aerogel varied greatly, dependent upon laser power and the nature of the particle. In the …
Date:
October 4, 2004
Creator:
Burchell, M. J.; Mann, J.; Creighton, J. A.; Kearsley, A. T.; Graham, G. A.; Esposito, A. P. et al.
Object Type:
Article
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Bob Carlquist, October 4, 2004]
Letter from Philip A. Berkebile, Executive Vice President at TDNA to Bob Carlquist to Executive VP and General Manager at the Houston Chronicle, on October 4, 2004. The letter is in regards to Carlquist being elected TDNA's treasurer for TDNA at the beginning of January 1, 2005 and on becoming the association's president in 2007.
Date:
October 4, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
[Clipping: Gay Republicans go on offensive over marriage ban]
Clipping of an article from The Dallas Morning News about gay Republicans go on offensive over marriage ban.
Date:
June 4, 2004
Creator:
unknown
Object Type:
Clipping
System:
The UNT Digital Library
[Email from Jill Waterston to Allen J. about campaign event]
Email from Jill Waterston to Allen J. on June 4, 2004, discussing SDEC campaign event.
Date:
June 4, 2004
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Bill Cornwell, October 4, 2004]
Letter from Philip A. Berkebile to Bill Cornwell, on October 4, 2004 with the subject Nominating Committee. The letter is in regard to Cornwell accepting President Donnis Baggett's request to serve on this year's Board of Directors Nomination Committee. Those serving with Cornwell are Baggett, Dan Savage, Aubrey Webb and the committee chairman Wesley Turner.
Date:
October 4, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Dan Savage, October 4, 2004]
Letter from Philip A. Berkebile to Dan Savage, October 4, 2004 with the subject Nomination Committee. The letter is in regards to Savage accepting President Donnis Baggett's request to serve on the 2005 Board of Directors Nominating Committee. Serving with Savage are Baggett, Bill Cornwell, Aubrey Webb and the committee chairman Wesley Turner. The purpose of the nominating committee is to fill four openings within the board members.
Date:
October 4, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 129, No. 23, Ed. 1 Thursday, November 4, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
November 4, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Title IX and Sex Discrimination in Education: An Overview
This report provides an overview of Title IX of the Education Amendments of 1972, and the various aspects of education affected by this law. Although Title IX has been only partially successful in eliminating sex discrimination in education, the effects of this legislation have been far-reaching.
Date:
March 4, 2004
Creator:
Galemore, Gary L.
Object Type:
Report
System:
The UNT Digital Library
Automobile and Light Truck Fuel Economy: The CAFE Standards
This report discusses energy legislation pertaining to fuel standards. The current corporate average fuel economy standard (CAFE) is 27.5 miles per gallon (mpg) for passenger automobiles and 20.7 mpg for light trucks (scheduled to increase to 22.2 mpg in model year [MY] 2007), a classification that also includes sport utility vehicles (SUVs). Congress had included language in the FY1996-FY2001 Transportation Appropriations prohibiting the use of appropriated funds for any rulemaking on CAFE, effectively freezing the standards.
Date:
November 4, 2004
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Aubrey Webb, October 4, 2004]
Letter from Philip A. Berkebile to Aubrey Webb on October 4, 2004 with the subject Nominating Committee. Berkebile thanks Webb for accepting TDNA's President Donnis Bagget's request to serve on the 2005 board of directors nomination committee. Serving with Webb will be Baggett, Bill Cornwell, Dan Savage and the committee chairman Wesley Turner.
Date:
October 4, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
Estimates of U.S. Commercial Building Electricity Intensity Trends: Issues Related to End-Use and Supply Surveys
This report examines measurement issues related to the amount of electricity used by the commercial sector in the U.S. and the implications for historical trends of commercial building electricity intensity (kWh/sq. ft. of floor space). The report compares two (Energy Information Administration) sources of data related to commercial buildings: the Commercial Building Energy Consumption Survey (CBECS) and the reporting by utilities of sales to commercial customers (survey Form-861). Over past two decades these sources suggest significantly different trend rates of growth of electricity intensity, with the supply (utility)-based estimate growing much faster than that based only upon the CBECS. The report undertakes various data adjustments in an attempt to rationalize the differences between these two sources. These adjustments deal with: 1) periodic reclassifications of industrial vs. commercial electricity usage at the state level and 2) the amount of electricity used by non-enclosed equipment (non-building use) that is classified as commercial electricity sales. In part, after applying these adjustments, there is a good correspondence between the two sources over the the past four CBECS (beginning with 1992). However, as yet, there is no satisfactory explanation of the differences between the two sources for longer periods that include the 1980s.
Date:
September 4, 2004
Creator:
Belzer, David B.
Object Type:
Report
System:
The UNT Digital Library
Induced polarization response of microbial induced sulfideprecipitation
A laboratory scale experiment was conducted to examine the use of induced polarization and electrical conductivity to monitor microbial induced sulfide precipitation under anaerobic conditions in sand filled columns. Three columns were fabricated; one for electrical measurements, one for geochemical sampling and a third non-inoculated column was used as a control. A continual upward flow of nutrients and metals in solution was established in each column. Desulfovibrio vulgaris microbes were injected into the middle of the geochemical and electrical columns. Iron and zinc sulfides precipitated along a microbial action front as a result of sulfate reduction due by Desulfovibrio vulgaris. The precipitation front initially developed near the microbial injection location, and subsequently migrated towards the nutrient inlet, as a result of chemotaxis by Desulfovibrio vulgaris. Sampling during and subsequent to the experiment revealed spatiotemporal changes in the biogeochemical measurements associated with microbial sulfate reduction. Conductivity measurements were insensitive to all biogeochemical changes occurred within the column. Changes in the IP response (of up to 14 mrad)were observed to coincide in place and in time with the active microbe respiration/sulfide precipitation front as determined from geochemical sampling. The IP response is correlated with the lactate concentration gradient, an indirect measurement of …
Date:
June 4, 2004
Creator:
Ntarlagiannis, Dimitrios; Williams, Kenneth Hurst; Slater, Lee & Hubbard, Susan
Object Type:
Article
System:
The UNT Digital Library
Magnetization reversal behaviour of nanogranular CoCrPt alloy thinfilms studied with magnetic transmission X-ray microscopy
The angular dependence of dissociative electron attachment (DEA) to polyatomic targets is formulated in the local complex potential model, under the assumption that the axial recoil approximation describes the dissociation dynamics. An additional approximation, which is found to be valid in the case of H{sub 2}O but not in the case of H{sub 2}S, makes it possible to describe the angular dependence of DEA solely from an analysis of the fixed-nuclei entrance amplitude, without carrying out nuclear dynamics calculations. For H{sub 2}S, the final-vibrational-state-specific angular dependence of DEA is obtained by incorporating the variation of the angular dependence of the entrance amplitude with nuclear geometry into the nuclear dynamics. Scattering calculations using the complex Kohn method and, for H{sub 2}S, full quantum calculations of the nuclear dynamics using the Multi-Configuration Time-Dependent Hartree method, are performed.
Date:
November 4, 2004
Creator:
Fischer, P.; Im, M.-Y.; Eimuller, T.; Schutz, G. & Shin, S.-C.
Object Type:
Article
System:
The UNT Digital Library
Minijet Deformation and Charge-independent Two-particleCorrelations on Momentum Subspace (eta,phi) In Au-Au Collisions atsqrt(sNN) = 130 GeV
We present first measurements of charge-independent correlations on momentum-space difference variables {eta}{sub 1}-{eta}{sub 2} (pseudorapidity) and {phi}{sub 1}-{phi}{sub 2} (azimuth) for charged primary hadrons with transverse momentum within 0.15 {le} p{sub t} {le} 2 GeV/c and |{eta}| {le} 1.3 from Au-Au collisions at {radical}s{sub NN} = 130 GeV. We observe strong charge-independent correlations associated with minijets and elliptic flow. The width of the minijet peak on {eta}{sub 1}-{eta}{sub 2} increases by a factor 2.3 from peripheral to central collisions, suggesting strong coupling of partons to a longitudinally-expanding colored medium. New methods of jet analysis introduced here reveal nonperturbative medium effects in heavy ion collisions.
Date:
November 4, 2004
Creator:
Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D. et al.
Object Type:
Article
System:
The UNT Digital Library
The South Pole Telescope
A new 10 meter diameter telescope is being constructed for deployment at the NSF South Pole research station. The telescope is designed for conducting large-area millimeter and sub-millimeter wave surveys of faint, low contrast emission, as required to map primary and secondary anisotropies in the cosmic microwave background. To achieve the required sensitivity and resolution, the telescope design employs an off-axis primary with a 10 m diameter clear aperture. The full aperture and the associated optics will have a combined surface accuracy of better than 20 microns rms to allow precision operation in the submillimeter atmospheric windows. The telescope will be surrounded with a large reflecting ground screen to reduce sensitivity to thermal emission from the ground and local interference. The optics of the telescope will support a square degree field of view at 2mm wavelength and will feed a new 1000-element micro-lithographed planar bolometric array with superconducting transition-edge sensors and frequency-multiplexed readouts. The first key project will be to conduct a survey over 4000 degrees for galaxy clusters using the Sunyaev-Zeldovich Effect. This survey should find many thousands of clusters with a mass selection criteria that is remarkably uniform with redshift. Armed with redshifts obtained from optical and infrared …
Date:
November 4, 2004
Creator:
Ruhl, J. E.; Ade, P. A. R.; Carlstrom, J. E.; Cho, H. M.; Crawford, T.; Dobbs, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation
This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the July 2003 to December 2003 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. Also, another activity included in this program focuses on the development of SOFC scale up strategies.
Date:
January 4, 2004
Creator:
Rahman, Faress & Minh, Nguyen
Object Type:
Report
System:
The UNT Digital Library