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Language
Oxygen Deficiency and Vacancy Formation in LSCO/PLZT/LSCO Capacitors.
None
Date:
November 29, 1999
Creator:
Friessenegg, T.
Object Type:
Article
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 106, No. 232, Ed. 1 Monday, November 29, 1999
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 29, 1999
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Pesticides: Use, Effects, and Alternatives to Pesticides in Schools
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the use of pesticides in schools, focusing on: (1) what federal requirements govern the use of pesticides in schools; (2) what information exists on the use of pesticides in schools; (3) what data exist on the incidences of short- and long-term illnesses linked to the exposure to pesticides in schools, and to the extent data are available, what does this data show; and (4) what actions are the Environmental Protection Agency (EPA) and the states taking, where appropriate, to reduce the use of pesticides in schools, and what are the results of their efforts."
Date:
November 29, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Phase Chemistry of Tank Sludge Residual Components
We are attempting to understand the solid phase chemistry of the high level nuclear waste (HLW) stored in tanks at Hanford. Because this waste is compositionally complex, our approach is to study experimentally the aging dynamics of simplified systems whose bulk chemistry approximates that of the tank sludges. After a basic understanding of these dynamics has been attained we plan to increase the compositional complexities one component at a time, in order to assess the influence of each component. Results will allow for reliable prediction of sludge phase chemistry over a range of sludge compositions. Iron and aluminum comprise the bulk of most HLW sludges, so we chose to begin by studying the behavior of iron-aluminum systems. Fe/Al ratios were chosen to approximate those relevant to the solutions that produced the sludge. Aluminum and iron concentrations in the various process fluids are summarized and compared to our experimental starting solutions in Table 1 (process solution data from Krumhansl, personal communication, 1998). Our low aluminum experiments serve as direct analogues to both Bismuth Phosphate and low-Fe PUREX waste. Cornell and Giovanoli (1985) found that, in a pure iron system at 70 C, a 10-fold or even 50-fold increase in suspension concentration …
Date:
November 29, 1999
Creator:
Krumhansl, James L.; Liu, Jun; Nagy, Kathryn L. & Brady, Patrick V.
Object Type:
Report
System:
The UNT Digital Library
Physics of DNAPL Migration and Remediation in the Presence of Heterogeneities
The goal of our research is to develop a fundamental quantitative understanding of the role of physical heterogeneities on DNAPL migration and remediation in aquifers. Such understanding is critical to cost effectively identify the location of the subsurface zone of contamination and design remediation schemes focused on removing the source of the contamination, the DNAPL itself. To reach this goal, the following objectives for the proposed research are defined: Objective 1: Develop fundamental understanding of the physics of DNAPL migration processes within heterogeneous porous media: (a) Conduct a suite of two-dimensional physical experiments within controlled and systematically varied heterogeneous porous media at scales up to one meter. Vary system parameters to consider a range of capillary and bond numbers within these heterogeneous porous structures. (b) Develop a new DNAPL migration model based on an up-scaling of invasion percolation (UP) to model the migration process. Compare the model predictions to experimental results. Accomplishing objective 1 provides a series of experiments against which we will be able to evaluate the validity of existing multi-phase flow theory as formulated in both percolation codes and in continuum flow codes. These experimental results will also provide new insights into DNAPL migration behavior. Development of the …
Date:
November 29, 1999
Creator:
CONRAD,STEPHEN H. & GLASS,ROBERT J.
Object Type:
Report
System:
The UNT Digital Library
Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from the (001)-Surface of a NI(sub 63)AL(sub 37) Single Crystal
Both x-ray diffuse reflectivity and laser light scattering have been used to investigate the temperature-dependent surface behavior of a Ni{sub 63}Al{sub 37} single crystal on different length scales. In-situ experiments were performed above the conventional martensitic start temperature M{sub s}. to search for premartensitic phenomena. X-ray experiments showed the presence of a surface precursor with second-order (continuous) character several 10 K above M{sub s}. This premonitory effect corresponds to a height-height-correlation function which changes on the nanometer scale as the martensitic transformation is approached. At the martensitic transformation, the surface morphology changed from nanoscopic roughness to macroscopic relief within a temperature interval of less than 1 K via intermediate stages. Laser light scattering was employed to study time-dependent aspects of the athermal martensitic transformation above M{sub s}. The occurrence of a martensitic transformation on isothermal holding after a certain incubation period was observed in Ni-Al for the first time. The measured incubation times increased by four orders of magnitude within a temperature interval of 0.5 K.
Date:
November 29, 1999
Creator:
Klemradt, U.; Aspelmeyer, M.; Abe, H.; Wood, L. T.; Moss, S. C.; Dimasi, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Proceedings of the 24th Day of Scientific lectures and 20th Annual Meeting of the National Society of Black Physicists
The National Society of Black Physicists will hold its Twentieth annual meeting and its XXIIII Day of Scientific Lectures at Lawrence Berkeley National Laboratory on March 27th - 30th, 1997. The meeting provides a major opportunity for African American physicists and students to present their current research and discuss issues germane to the constituency. It is therefore crucial to have the broadest cross-section of the membership at each meeting. The Lawrence Berkeley National Laboratory was chosen as the site of the 20th annual meeting because of its historical significance to Physics (being one of the first national laboratories in the United States) and the laboratories continuing support of the goals and objectives of the society.
Date:
November 29, 1999
Creator:
Jackson, K. H. & Carwell, H. V.
Object Type:
Article
System:
The UNT Digital Library
Prognostic Prediction of Tracer Dispersion for the Diablo Canyon Experiments on August 31, September 2, and September 4, 1986
COAMPS/LODI simulations of the tracer experiments at Diablo Canyon on August 31, September 2, and September 4, 1986 had mixed results. Simulated tracer concentrations on August 31 differed significantly from the measured concentrations. The model transported SF{sub 6} too far south and did not predict transport of SF{sub 6} north along highway 101 or into See Canyon. Early in the day the model rapidly transported SF{sub 6} away from the release point while observations suggested the tracer stayed close to Diablo Canyon for 1-2 hours. For September 2, simulations agreed very well with the measurements. The model accurately predicted the change of wind direction from north northwest to east northeast at the release point. It also predicted the advection of tracer over Mot-r-0 Bay and through the Los Osos Valley toward San Luis Obispo in excellent agreement with the observations. On September 4, the calculated transport of SF{sub 6} from Diablo Canyon had defects similar to those on August 31, a trajectory too far south and limited intrusion of tracer north along highway 101. Conversely, simulations of the Freon release from Los Osos Cemetery on September 4 corresponded well with observations. Since the simulations used only global meteorological data and …
Date:
November 29, 1999
Creator:
Molenkamp, C.R.
Object Type:
Report
System:
The UNT Digital Library
Receiving Basin for Offsite Fuels and the Resin Regeneration Facility Safety Analysis Report, Executive Summary
The Safety Analysis Report documents the safety authorization basis for the Receiving Basin for Offsite Fuels (RBOF) and the Resin Regeneration Facility (RRF) at the Savannah River Site (SRS). The present mission of the RBOF and RRF is to continue in providing a facility for the safe receipt, storage, handling, and shipping of spent nuclear fuel assemblies from power and research reactors in the United States, fuel from SRS and other Department of Energy (DOE) reactors, and foreign research reactors fuel, in support of the nonproliferation policy. The RBOF and RRF provide the capability to handle, separate, and transfer wastes generated from nuclear fuel element storage. The DOE and Westinghouse Savannah River Company, the prime operating contractor, are committed to managing these activities in such a manner that the health and safety of the offsite general public, the site worker, the facility worker, and the environment are protected.
Date:
November 29, 1999
Creator:
Shedrow, C. B.
Object Type:
Report
System:
The UNT Digital Library
Relationship Between Structure and Luminescent Properties of Epitaxial Grown Y{sub 2}O{sub 3}: Eu Thin Films on LaAlO{sub 3} Substrates
None
Date:
November 29, 1999
Creator:
Gao, H-J.; Duscher, G.; Fan, X.; Pennycook, S. J.; Kumar, D.; Cho, K. G. et al.
Object Type:
Article
System:
The UNT Digital Library
RESONANT X-RAY SCATTERING FROM THE SURFACE OF A DILUTE LIQUID HG-AU ALLOY.
None
Date:
November 29, 1999
Creator:
DIMASI,E.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 65, Ed. 1 Monday, November 29, 1999
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 29, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Spent Nuclear Fuel Alternative Technology Decision Analysis
The Westinghouse Savannah River Company (WSRC) made a FY98 commitment to the Department of Energy (DOE) to recommend a technology for the disposal of aluminum-based spent nuclear fuel (SNF) at the Savannah River Site (SRS). The two technologies being considered, direct co-disposal and melt and dilute, had been previously selected from a group of eleven potential SNF management technologies by the Research Reactor Spent Nuclear Fuel Task Team chartered by the DOE''s Office of Spent Fuel Management. To meet this commitment, WSRC organized the SNF Alternative Technology Program to further develop the direct co-disposal and melt and dilute technologies and ultimately provide a WSRC recommendation to DOE on a preferred SNF alternative management technology.
Date:
November 29, 1999
Creator:
Shedrow, C. B.
Object Type:
Report
System:
The UNT Digital Library
Spent Nuclear Fuel Alternative Technology Risk Assessment
A Research Reactor Spent Nuclear Fuel Task Team (RRTT) was chartered by the Department of Energy (DOE) Office of Spent Fuel Management with the responsibility to recommend a course of action leading to a final technology selection for the interim management and ultimate disposition of the foreign and domestic aluminum-based research reactor spent nuclear fuel (SNF) under DOE''s jurisdiction. The RRTT evaluated eleven potential SNF management technologies and recommended that two technologies, direct co-disposal and an isotopic dilution alternative, either press and dilute or melt and dilute, be developed in parallel. Based upon that recommendation, the Westinghouse Savannah River Company (WSRC) organized the SNF Alternative Technology Program to further develop the direct co-disposal and melt and dilute technologies and provide a WSRC recommendation to DOE for a preferred SNF alternative management technology. A technology risk assessment was conducted as a first step in this recommendation process to determine if either, or both, of the technologies posed significant risks that would make them unsuitable for further development. This report provides the results of that technology risk assessment.
Date:
November 29, 1999
Creator:
Perella, V.F.
Object Type:
Report
System:
The UNT Digital Library
Study of Chromium-Doped Diamond-Like Carbon by Z-Contrast Imaging and Electron Energy Loss Spectroscopy
Metal-doped diamond-like carbon films were produced for the purpose of an electrochemical nano-electrode. In this study we use Z-contrast scanning transmission electron microscopy to directly observe metal cluster formation and distributions within the chromium-doped carbon films. At low doping ({approximately}6at%Cr), Cr is uniformly distributed; at high doping ({approximately}12at%Cr), Cr-rich clusters are formed. Using electron energy loss spectroscopy, we find that the Cr clusters tend to be metallic-like at low doping levels and carbide-like at high doping levels according to the Cr L, white line ratios. The carbon is more diamond-like at low doping and more graphite/carbide like at high doping according to the sp1/sp3 electron percentage measurements.
Date:
November 29, 1999
Creator:
Fax, X.; Dickey, E.C. & Pennycook, S.J.
Object Type:
Article
System:
The UNT Digital Library
A Study of the Stability and Characterization Plutonium Dioxide and Chemical Characterization [of] Rocky Flats and Los Alamos Plutonium-Containing Incinerator Ash
In the presentation ''A Study of the Stability and Characterization of Plutonium Dioxide'', the authors discuss their recent work on actinide stabilities and characterization, in particular, plutonium dioxide PuO{sub 2}. Earlier studies have indicated that PuO{sub 2} has the fluorite structure of CaF{sub 2} and typical oxide semiconductor properties. However, detailed results on the bulk electronic structure of this important actinide oxide have not been available. The authors have used all-electron, full potential linear combinations Gaussian type orbitals fitting function (LCGTO-FF) method to study PuO{sub 2}. The LCGTO-FF technique characterized by its use of three independent GTO basis sets to expand the orbitals, charge density, and exchange-correlation integral kernels. Results will be presented on zero pressure using both the Hedin-Lundquist local density approximation (LDA) model or the Perdew-Wang generalized gradient approximation (GGA) model. Possibilities of different characterizations of PuO{sub 2} will be explored. The paper ''Chemical Characterization Rocky Flats and Los Alamos Plutonium-Containing Incinerator Ash'' describes the results of a comprehensive study of the chemical characteristics of virgin, calcined and fluorinated incinerator ash produced at the Rocky Flats Plant and at the Los Alamos National Laboratory prior to 1988. The Rocky Flats and Los Alamos virgin, calcined, and fluorinated ashes …
Date:
November 29, 1999
Creator:
Ray, A.K.; Boettger, J.C. & Behrens, Robert G.
Object Type:
Article
System:
The UNT Digital Library
Tank 241-TX-118 Final Report for Rotary Mode Core Samples [RMCS] 259 and 260 [SEC 1 THRU SEC 5]
None
Date:
November 29, 1999
Creator:
BELL, K.E.
Object Type:
Report
System:
The UNT Digital Library
Update on onshore disposal of offshore drilling wastes
The US Environmental Protection Agency (EPA) is developing effluent limitations guidelines to govern discharges of cuttings from wells drilled using synthetic-based muds. To support this rulemaking, Argonne National Laboratory was asked by EPA and the US Department of Energy (DOE) to collect current information about those onshore commercial disposal facilities that are permitted to receive offshore drilling wastes. Argonne contacted state officials in Louisiana, Texas, California and Alaska to obtain this information. The findings, collected during October and November 1999, are presented by state.
Date:
November 29, 1999
Creator:
Veil, J. A.
Object Type:
Report
System:
The UNT Digital Library
Z-Contrast Scanning Transmission Electron Microscopy as a Tool for Interface Analysis in Nanocrystal-Polymer Nanocomposites
None
Date:
November 29, 1999
Creator:
Kadavanich, A.V.; Kippeny, T.; Erwin, M.; Rosenthal, S.J. & Pennycook, S.J.
Object Type:
Article
System:
The UNT Digital Library
Z-Contrast STEM Imaging and Ab-Initio Calculations of Grain Boundaries in SrTiO
The understanding of electrical properties of grain boundaries in perovskites is essential for their application to capacitors, varistors and positive-temperature coefficient resistors. The origin of the electrical activity is generally attributed to the existence of charged defects in grain boundaries, usually assumed to be impurities, which set up a double Schottky barrier as they are screened by dopants in the adjacent bulk crystal. Microscopic understanding of the origin of the grain boundary charge, however, has not been achieved. It is not known yet if the charged grain boundary states are an intrinsic property of a stoichiometric grain boundary, arise from nonstoichiometry, or are caused by impurities. Here, the relation between atomic structure and electronic properties is studied by combining experiment with ab-initio calculations. The starting structures for theoretical calculations were obtained from Z-contrast images combined with electron energy loss spectroscopy to res olve the dislocation Core structures comprising the boundary. Dislocation core reconstructions are typical of all grain boundaries so far observed in this material. They avoid like-ion repulsion, and provide alternative sites for cation occupation in the grain boundaries. Optimized atomic positions are found by total energy calculations. Calculated differences in vacancy formation energies between the grain boundaries and …
Date:
November 29, 1999
Creator:
Kim, M.; Browning, N. D.; Pennyscook, S. J.; Sohlberg, K. & Pantelides, S. T.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 29, No. 8, Ed. 1 Friday, October 29, 1999
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 29, 1999
Creator:
Ming, Holly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Advanced Fingerprint Analysis Project Fingerprint Constituents
The work described in this report was focused on generating fundamental data on fingerprint components which will be used to develop advanced forensic techniques to enhance fluorescent detection, and visualization of latent fingerprints. Chemical components of sweat gland secretions are well documented in the medical literature and many chemical techniques are available to develop latent prints, but there have been no systematic forensic studies of fingerprint sweat components or of the chemical and physical changes these substances undergo over time.
Date:
October 29, 1999
Creator:
Mong, GM; Petersen, CE & Clauss, TRW
Object Type:
Report
System:
The UNT Digital Library
Alternative Fuel News, Vol. 3 No. 3
The alternative fuel industry is heating up. It is a very exciting time to be in the energy business, especially when it comes to transportation. Celebrating of the milestone 75th Clean Cities coalition and kick off of the new Federal Alternative Fuel Vehicle (AFV) USER Program is occurring in cities across the country. Clean Energy for the 21st Century and the events that are happening during Energy Awareness Month are covered in this issue. Spotlighted are niche markets; several airports across the country are successfully incorporating alternative fuels into their daily routines.
Date:
October 29, 1999
Creator:
DOE, Clean Cities Program at
Object Type:
Book
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 100, No. 190, Ed. 1 Friday, October 29, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 29, 1999
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History