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["Love and Nappiness Revue" live performance]
Video footage from The Black Academy of Arts and Letters recorded during the "Love and Nappiness Revue" over the weekend of June 15-16th, 2001 at the Clarence Muse Café Theatre. The footage shows various short performances all centered on the topic of promoting a positive image of the African American cultural heritage. All the skits focus on the rituals of beauty and the stories that are told as a result of the process of keeping one's hair.
Date:
June 16, 2001
Creator:
A Nappy Hair Affair
Object Type:
Video
System:
The UNT Digital Library
Evolution of Stress in ScD{sub 2}/Cr Thin Films Fabricated by Evaporation and High Temperature Reaction
The stress of scandium dideuteride, ScD{sub 2}, thin films is investigated during each stage of vacuum processing including metal deposition via evaporation, reaction and cooldown. ScD{sub 2} films with thin Cr underlayers are fabricated on three different substrate materials: molybdenum-alumina cermet, single crystal sapphire and quartz. In all experiments, the evaporated Cr and Sc metal is relatively stress-free. However, reaction of scandium metal with deuterium at elevated temperature to form a stoichiometric dideuteride phase leads to a large compressive in-plane film stress. Compression during hydriding results from an increased atomic density compared with the as-deposited metal film. After reaction with deuterium, samples are cooled to ambient temperature, and a tensile stress develops due to mismatched coefficients of thermal expansion (CTE) of the substrate-film couple. The residual film stress and the propensity for films to crack during cooldown depends principally on the substrate material when using identical process parameters. Films deposited onto quartz substrates show evidence of stress relief during cooldown due to a large CTE misfit; this is correlated with crack nucleation and propagation within films. All ScD{sub 2} layers remain in a state of tension when cooled to 30 C. An in-situ, laser-based, wafer curvature sensor is designed and …
Date:
June 1, 2001
Creator:
ADAMS,DAVID P.; BROWN,LAURENCE E.; GOEKE,RONALD S.; ROMERO,JUAN A. & SILVA,ANDREW D.
Object Type:
Report
System:
The UNT Digital Library
EFFECTS OF IN-PLANE STRAIN ON ORBITAL ORDERING AND MAGNETISM IN LaMnO3 THIN FILM
None
Date:
June 1, 2001
Creator:
AHN, K. & MILLIS, A.
Object Type:
Article
System:
The UNT Digital Library
EFFECT OF TEMPERATURE PROFILE ON REACTION VIOLENCE IN HEATED AND SELF-IGNITED PBX-9501
None
Date:
June 1, 2001
Creator:
ASAY, B.; DICKSON, P. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Migration and Entrapment of DNAPLs in Heterogeneous Systems: Impact of Waste and Porous Medium Composition
Previously funded EMSP research efforts have been directed towards the quantification of dense nonaqueous phase liquid (DNAPL) migration and entrapment behavior in physically and chemically heterogeneous systems. This important research has demonstrated that chemical heterogeneities can have a significant influence on DNAPL fate and persistence. Previous work, however, has been limited to pure DNAPLs and well defined aqueous and solid surface chemistries. Subsurface chemical heterogeneities at many DOE sites are generally more complex as a result of the disposal of mixtures of wastes into heterogeneous subsurface environments. The research planned in this project seeks to build upon our previous research experience and expertise to explore the influence of waste and porous media composition on DNAPL migration and entrapment in the saturated zone. DNAPL mixtures and soils typical of those found across the DOE complex will be used in these studies. Many of the experimental procedures and protocols to be employed are based upon those developed under previous EMSP funding. This past work also provides the conceptual framework for characterizing and interpreting experimental results, mathematical model development, and inverse modeling protocols. Specific objectives of this research are identified below: (1) Relate measured interfacial properties for representative wastes and soils to parameters …
Date:
June 1, 2001
Creator:
Abriola, Linda M. & Demond, Avery H.
Object Type:
Report
System:
The UNT Digital Library
Insulated Pressure Vessels for Vehicular Hydrogen Storage: Analysis and Performance Evaluation
Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen (LH{sub 2}) or ambient-temperature compressed hydrogen (CH{sub 2}). Insulated pressure vessels offer the advantages of liquid hydrogen tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The work described here is directed at verifying that commercially available pressure vessels can be safely used to store liquid hydrogen. The use of commercially available pressure vessels significantly reduces the cost and complexity of the insulated pressure vessel development effort. This paper describes a series of tests that have been done with aluminum-lined, fiber-wrapped vessels to evaluate the damage caused by low temperature operation. All analysis and experiments to date indicate that no significant damage has resulted. Required future tests are described that will prove that no technical barriers exist to the safe use of aluminum-fiber vessels at cryogenic temperatures. Future activities also include a demonstration project in which the insulated pressure vessels will be installed and tested on two vehicles. A draft standard will also be generated for obtaining certification for insulated pressure vessels.
Date:
June 26, 2001
Creator:
Aceves, S. M.; Martinez-Frias, J.; Garcia-Villazana, O. & Espinosa-Loza, F.
Object Type:
Article
System:
The UNT Digital Library
Performance and Certification Testing of Insulated Pressure Vessels for Vehicular Hydrogen Storage
Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen (LH2) or ambient-temperature compressed hydrogen (CH2). Insulated pressure vessels offer the advantages of liquid hydrogen tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The work described here is directed at verifying that commercially available pressure vessels can be safely used to store liquid hydrogen. The use of commercially available pressure vessels significantly reduces the cost and complexity of the insulated pressure vessel development effort. This paper describes a series of tests that have been done with aluminum-lined, fiber-wrapped vessels to evaluate the damage caused by low temperature operation. All analysis and experiments to date indicate that no significant damage has resulted. Required future tests are described that will prove that no technical barriers exist to the safe use of aluminum-fiber vessels at cryogenic temperatures. Future activities also include a demonstration project in which the insulated pressure vessels will be installed and tested on two vehicles. A draft standard will also be generated for obtaining certification for insulated pressure vessels.
Date:
June 3, 2001
Creator:
Aceves, S. M.; Martinez-Frias, J.; Garcia-Villazana, O. & Espinosa-Loza, F.
Object Type:
Article
System:
The UNT Digital Library
Monitoring the Migrations of Wild Snake River Spring/Summer Chinook Salmon Smolts, 1999 Annual Report.
This report details the 1999 results from an ongoing project to monitor the migration behavior of wild spring/summer chinook salmon smolts in the Snake River Basin. The report also discusses trends in the cumulative data collected for this project from Oregon and Idaho streams since 1989.
Date:
June 1, 2001
Creator:
Achord, Stephen
Object Type:
Report
System:
The UNT Digital Library
The Alabama School Prayer Case: Chandler v. Siegelman
This report considers the events of Chandler v. James in 1997. The case was a federal district court ruling in Alabama holding up a statute to violate the establishment of religion of the First amendment. The Governor attempted to appeal the court's position to both the Supreme Court and the circuit court but was denied.
Date:
June 25, 2001
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
Mid-Atlantic Region Consumer's Guide to Buying a Solar Electric System - Revision
Consumers in Pennsylvania, Virginia, Delaware, Maryland, the District of Columbia, West Virginia, and New Jersey are showing increased interest in solar electric systems for their homes and businesses. This booklet provides basic information about buying a PV system. Photovoltaic (PV) systems are reliable, pollution free, and use a renewable source of energy--the sun. A PV system can be a substantial investment and careful planning will help ensure that you make the right decisions.
Date:
June 19, 2001
Creator:
Administration, Maryland Energy
Object Type:
Book
System:
The UNT Digital Library
Impact of Rock Bolts on Seepage
Characterization of seepage into drifts in unsaturated fractured tuff is a key factor for assessing the long-term viability of the proposed high level nuclear waste repository at Yucca Mountain. Rock bolts are among the methods proposed for ground control in the emplacement drifts. They may provide a conduit whereby percolating water that would otherwise bypass the drift will seep into the drift. The objective of this study is to assess the impact that the use of rock bolts may have on seepage. The impact of rock bolts on seepage is studied using a numerical model that is finely discretized around the rock bolt. There are several sources of uncertainty and variability with respect to the flow system around the drift and rock bolt. There is uncertainty about the capillary strength of the fractures around the drift. There is also uncertainty about how the permeability and capillary strength of the grout used to cement the steel rock bolts into the bolt holes will change over time. There is variability expected in the percolation rates incident upon the drifts depending on location. The uncertainty and variability of these parameters are approached by evaluating the rock bolt impact over a range of values …
Date:
June 1, 2001
Creator:
Ahlers, F. C.
Object Type:
Report
System:
The UNT Digital Library
STATUS AND RECENT PERFORMANCE OF THE ACCELERATORS THAT SERVE AS GOLD INJECTOR FOR RHIC.
The recent successful commissioning and operation [1] of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) requires the injection of gold ions of specified energy and intensity with longitudinal and transverse emittances small enough to meet the luminosity requirements of the collider. Ion beams with the desired characteristics are provided by a series of three accelerators, the Tandem, Booster and AGS. The current status and recent performance of these accelerators are reviewed in this paper.
Date:
June 18, 2001
Creator:
Ahrens, L.; Alessi, J.; Van Asselt, W.; Benjamin, J.; Blaskiewicz, M.; Brennan, J. M. et al.
Object Type:
Article
System:
The UNT Digital Library
ESADA Plutonium Program Critical Experiments: Power Distribution Measurements
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 Empire State Atomic Development Associates (ESADA) plutonium program and Westinghouse. The purpose of these experiments was to develop experimental data useful in validating analytical methods used in the design of plutonium-bearing replacement fuel for water reactors. Three different fuel types 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:
June 12, 2001
Creator:
Akkurt, H.
Object Type:
Report
System:
The UNT Digital Library
On the Choice of Method to Cancel 60 Hz Disturbances in Beam Position and Energy
Because the voltage applied to magnets in accelerators is likely to be rectified, there can be 60 Hz related fluctuations in beam position and energy. Correcting such errors as well as other less repeatable errors can be done with combinations of feedback, feedforward, real time repetitive control, and batch update repetitive control. This paper studies how to mix these approaches for optimized performance. It is shown that use of feedback control can be counterproductive because of the waterbed effect operating on errors such as BPM noise. Also, it is seen that iterative repetitive control updates can produce significantly better error levels than pure feedforward control. Making corrections of errors for harmonics of 60 Hz that are above the Nyquist frequency can be accomplished, and this can save the expense and integration effort to produce fast beam sampling.
Date:
June 1, 2001
Creator:
Akogyeram, R.A.; Longman, R.W.; Hutton, Andrew & Juang, J.-N.
Object Type:
Article
System:
The UNT Digital Library
GUT implications from neutrino mass
An overview is given of the experimental neutrino mixing results and types of neutrino models proposed, with special attention to the general features of various GUT models involving intra-family symmetries and horizontal flavor symmetries. Many of the features are then illustrated by a specific SO (10) SUSY GUT model formulated by S.M. Barr and the author which can explain all four types of solar neutrino mixing solutions by various choices of the right-handed Majorana mass matrix. The quantitative nature of the model's large mixing angle solution is used to compare the reaches of a neutrino super beam and a neutrino factory for determining the small U{sub e3} mixing matrix element.
Date:
June 26, 2001
Creator:
Albright, Carl H.
Object Type:
Article
System:
The UNT Digital Library
Progress in the Operation of a High Intensity EBIS at BNL
Excellent progress has been made in the operation of the BNL Electron Beam Ion Source (EBIS), which is a prototype for an EBIS that could meet requirements for a RHIC preinjector. We have achieved very stable operation of the electron beam at 10 A through the EBIS trap. At 7 A electron beam current, 2.8 x 10{sup 11} charges have been extracted in short pulses from ionization of residual gas, exceeding our goal for yield for the corresponding trap capacity. The EBIS has been operated very successfully with Xe gas injection, and external injection of Cs and Au ions, where the expected yields and charge-state distributions were measured.
Date:
June 18, 2001
Creator:
Alessi, J. G.; Beebe, E.; Gould, O.; Kponou, A.; Pikin, A.; Prelec, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Fred Vogel, August 8, 2001
Access:
Use of this item is restricted to the UNT Community
Interview with Fred Vogel, a Army WWII veteran from Austin, Minnesota. Vogel discusses his family and upbringing, football and college, working as a lawyer, joining the Army and basic training, attending Officer Candidate School, infantry training, deployment to New Guinea with the 33rd Infantry Division, the invasion of Morotai, combat around Lingayen Gulf in the Philippines, and occupation duty in Japan.
Date:
June 13, 2001
Creator:
Alexander, William J. & Vogel, Fred
Object Type:
Book
System:
The UNT Digital Library
Polymer-Supported Reagents: The Role of Bifunctionality in the Design of Ion-Selective Complexants
The importance of multi-functionality in the preparation of ion-selective polymers is evident from the structure of enzymes where specific metal ions are bound through cooperative interactions among different amino acids. In synthetic polymers, ionic selectivity is enhanced when a chemical reaction is superimposed on an ion-exchange process. The concept of reactive ion exchange has been extended through the synthesis of crosslinked polymers whose metal ion selectivity is a function of reduction, coordination or precipitation reactions as determined by various covalently bound ligands. Development of three classes of dual mechanism bifunctional polymers, a new series of bifunctional diphosphonate polymers, and novel bifunctional ion-selective polymers with enhanced ionic accessibility has been accomplished.
Date:
June 1, 2001
Creator:
Alexandratos, S. D.
Object Type:
Report
System:
The UNT Digital Library
PARAMETERS FOR QUANTIFYING BEAM HALO
Two different parameters for the quantitative description of beam halo are introduced, both based on moments of the particle distribution. One parameter is a measure of spatial halo formation and has been defined previously by Wangler and Crandall [3], termed the profile parameter. The second parameter relies on kinematic invariants to quantify halo formation in phase space; we call it the halo parameter. The profile parameter can be computed from experimental beam profile data. The halo parameter provides a theoretically more complete description of halo in phase space, but is difficult to obtain experimentally.
Date:
June 1, 2001
Creator:
Allen, C. K. & Wangler, T. P.
Object Type:
Article
System:
The UNT Digital Library
The CEBAF Beam Scraping Monitor
The Beam Scraping Monitor (BSM) is used to detect small amounts of beam loss in Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF). The BSM acts as an early warning system that alerts CEBAF operators when the beam loss exceeds 10 to 20 nA. This allows the CEBAF operators to adjust the beam orbit before beam loss reaches the Beam Current Monitor (BCM) system threshold (presently 2 mu-A) and shuts down the accelerator. The reference oscillators of four digital signal processing (DSP) lock-in amplifiers are connected to two vertical and two horizontal corrector magnets in the CEBAF injector. These magnets excite transverse oscillations on the electron beam that are significantly smaller than the beam size, producing a negligible effect on beam delivery. To cover the entire accelerator enclosure, the correctors of each plane are separated by pi/2 betatron phase advance.When the electron beam approaches the beam enclosure some electrons get scraped off, causing an amplitude modulation of the beam current at the reference oscillator frequencies. This is picked up by the BCM cavities and relayed to the lock-in amplifiers for synchronous integrated detection. The lock-in amplifiers then transmit the scraping information serially to a LINUX computer running EPICS Portable Channel …
Date:
June 1, 2001
Creator:
Allison, T.; Lebedev, V.; Piller, C.; Sage, J. & Wiseman, M.
Object Type:
Article
System:
The UNT Digital Library
Immobilization of AM-241, Formed Under Plutonium Metal Conversion into Monazite-Type Ceramics
Lanthanum orthophosphate with the monazite structure was proposed on examinations as a suitable matrix for immobilization of future americium-containing liquid wastes, which could be formed in conversion of metallic plutonium into oxide at PA ''Mayak.'' Specimens of monazite non-active ceramics were fabricated from LaPOA powders obtained using a thin-film evaporator by either hot-pressing or cold-pressing and sintering at 900-1300 C. According to electron microprobe analysis (EMPA), scanning electron microscopy (SEM), and X-ray diffraction (XRD), which were used for characterization of produced samples, all specimens did not contain any phase other than the monoclinic monazite phase. Ceramics having the specific activity of Am-241 2.13 {center_dot}10{sup 7} Bq/g were prepared by only cold-pressing with subsequent sintering at 1300 C during 1 hour. The normalized leach rates of lanthanum and americium in distilled water at 90 C were less than 1.2. 10{sup 4} and 2.3 10{sup -4} g/m{sup 2} {center_dot} day, respectively.
Date:
June 6, 2001
Creator:
Aloy, A. S.; Kovarskaya, E. N.; Koltsova, T. I.; Samoylov, S. E.; Rovnyi, S. I.; Medvedev, G. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Personnel Access Control System Evaluation for National Ignition Facility Operations
The purpose of this document is to analyze the baseline Access Control System for the National Ignition Facility (NIF), and to assess its effectiveness at controlling access to hazardous locations during full NIF operations. It reviews the various hazards present during a NIF shot sequence, and evaluates the effectiveness of the applicable set of controls at preventing access while the hazards are present. It considers only those hazards that could potentially be lethal. In addition, various types of technologies that might be applicable at NIF are reviewed, as are systems currently in use at other facilities requiring access control for safety reasons. Recommendations on how this system might be modified to reduce risk are made.
Date:
June 1, 2001
Creator:
Altenbach, T; Brereton, S.; Hermes, G. & Singh, M.
Object Type:
Report
System:
The UNT Digital Library
High-Efficiency Target-Ion sources for RIB Generation
In this report, emphasis is placed on issues related to selection and design of high-temperature, ion sources that have demonstrated the high ionization efficiency, species versatility, and operational reliability required at ISOL based radioactive ion beam facilities. In designing sources for ISOL applications, careful attention must be given to the following: selecting the most appropriate materials of construction, coupling of the vapor transport system, ion optics, operational parameters, thermal transport properties, emittances, ionization efficiencies and engineering details for safe handling in the high-level radioactivity radiation fields incumbent at such facilities. Included in the article are descriptions and performance data for high temperature, positive (electron-impact and surface-ionization) and negative (kinetic-ejection and surface-ionization) ion sources, as well as, low temperature, batch-mode negative-ion sources, developed for processing long-lived isotopes, that have been principal contributors to recent successes held at the Holifield Radioactive Ion Beam Facility.
Date:
June 29, 2001
Creator:
Alton, G. D.
Object Type:
Article
System:
The UNT Digital Library
A Hydrologic-Geophysical Method for Characterizing Flow and Transport Processes within the Vadose Zone
The objective of this study is to analyze flow and transport within the vadose zone during a midscale hydrologic infiltration experiment to characterize in-situ transport processes. This project will employ numerical and experimental tools developed under a previously funded EMSP proposal (project number 55332) to provide 3-D unsaturated hydrologic property distributions. In the present project, geophysical imaging techniques will be employed to track an analogue contaminant plume. The results will provide a better understanding of transport modes including the influence of natural heterogeneities and man-made structures within the vadose zone at DOE sites. In addition the data will provide checks against which numerical flow and transport simulations can be compared.
Date:
June 2001
Creator:
Alumbaugh, David L. & Brainard, James R.
Object Type:
Report
System:
The UNT Digital Library