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265
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83
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43
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30
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12
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8
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5
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Office of Scientific & Technical Information Technical Reports
120
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106
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106
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71
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56
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49
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31
National Museum of the Pacific War Oral History Collection
30
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Seminole Sentinel (Seminole, Tex.), Vol. 96, No. 16, Ed. 1 Sunday, December 7, 2003
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 7, 2003
Creator:
Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 94, Ed. 1 Sunday, September 7, 2003
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 7, 2003
Creator:
Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 117, No. 32, Ed. 1 Thursday, August 7, 2003
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 7, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 121, No. 63, Ed. 1 Thursday, August 7, 2003
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
August 7, 2003
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 121, No. 72, Ed. 1 Sunday, September 7, 2003
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
September 7, 2003
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 32, Ed. 1 Thursday, August 7, 2003
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
August 7, 2003
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Interprocessor communication with limited memory
Many parallel applications require periodic redistribution of workloads and associated data. In a distributed memory computer, this redistribution can be difficult if limited memory is available for receiving messages. We propose a model for optimizing the exchange of messages under such circumstances which we call the minimum phase remapping problem. We first show that the problem is NP-Complete, and then analyze several methodologies for addressing it. First, we show how the problem can be phrased as an instance of multi-commodity flow. Next, we study a continuous approximation to the problem. We show that this continuous approximation has a solution which requires at most two more phases than the optimal discrete solution, but the question of how to consistently obtain a good discrete solution from the continuous problem remains open. We also devise simple and practical approximation algorithm for the problem with a bound of 1.5 times the optimal number of phases. We also present an empirical study of variations of our algorithms which indicate that our approaches are quite practical.
Date:
May 7, 2003
Creator:
Pinar, Ali & Hendrickson, Bruce
Object Type:
Article
System:
The UNT Digital Library
Prediction of water seepage into a geologic repository for high-level radioactive waste
Predicting the amount of water that may seep into waste emplacement drifts is important for assessing the performance of the proposed geologic repository for high-level radioactive waste at Yucca Mountain, Nevada. The repository would be located in thick, partially saturated fractured tuff that will be heated to above-boiling temperatures as a result of heat generation from the decay of nuclear waste. Since infiltrating water will be subject to vigorous boiling for a significant time period, the superheated rock zone (i.e., rock temperature above the boiling point of water) can form an effective vaporization barrier that reduces the possibility of water arrival at emplacement drifts. In this paper, we analyze the behavior of episodic preferential flow events that penetrate the hot fractured rock, evaluate the impact of such flow behavior on the effectiveness of the vaporization barrier, and discuss the implications for the performance assessment of the repository. A semi-analytical solution is utilized to determine the complex flow processes in the hot rock environment. The solution is applied at several discrete times after emplacement, covering the time period of strongly elevated temperatures at Yucca Mountain.
Date:
July 7, 2003
Creator:
Birkholzer, Jens; Mukhophadhyay, Sumit & Tsang, Yvonne
Object Type:
Article
System:
The UNT Digital Library
Computational economy improvements in PRISM
None
Date:
May 7, 2003
Creator:
Tonse, Shaheen R.; Moriarty, Nigel W.; Frenklach, Michael & Brown, Nancy J.
Object Type:
Article
System:
The UNT Digital Library
Performance evaluation of cleanroom environmental systems
This paper presents in-situ measurement results for energy and environmental performance of thirteen cleanroom systems located in the USA, including key metrics for evaluating cleanroom air system performance and overall electric power intensity. Comparisons with the IEST Recommended Practice (IEST-RP-CC012.1) are made to examine the performance of cleanroom air systems. Based upon the results, the paper discusses likely opportunities for improving cleanroom energy efficiency while maintaining effective contamination control. The paper concludes that there are wide variations in energy performance of cleanroom environmental systems, and that performance benchmarking can serve as a vehicle to identify energy efficient cleanroom design practices and to highlight important issues in cleanroom operation and maintenance.
Date:
July 7, 2003
Creator:
Xu, Tengfang
Object Type:
Article
System:
The UNT Digital Library
An introduction to using software tools for automatic differentiation.
The authors give a gentle introduction to using various software tools for Automatic Differentiation (AD). Ready-to-use examples are discussed and links to further information are presented. The target audience includes all those who are looking for a straight-forward way to get started using the available AD technology. The document is supposed to be dynamic in the sense that its content will be kept up-to-date as the AD software covered is evolving.
Date:
October 7, 2003
Creator:
Naumann, U. & Walther, A.
Object Type:
Report
System:
The UNT Digital Library
SYNTHESIS AND CHARACTERIZATION OF NEW INTERMETALLIC COMPOUNDS
This six-month work is focused mainly on the properties of novel magnetic intermetallics. In the first project, we synthesized several 2:17 intermetallic compounds, namely Nd{sub 2}Fe{sub 15}Si{sub 2}, Nd{sub 2}Fe{sub 15}Al{sub 2}2, Nd{sub 2}Fe{sub 15}SiAl and Nd{sub 2}Fe{sub 15}SiMn, as well as several 1:12 intermetallic compounds, such as NdFe{sub 10}Si{sub 2}, NdFe{sub 10}Al{sub 2}, NdFe{sub 10}SiAl and NdFe{sub 10}MnAl. In the second project, seven compositions of Nd{sub x}Fe{sub 100-x-y}B{sub y} ribbons were prepared by a melt spinning method with Nd and B content increasing from 7.3 and 3.6 to 11 and 6, respectively. The alloys were annealed under optimized conditions to obtain a composite material consisting of the hard magnetic Nd{sub 2}Fe{sub 14}B and soft magnetic {alpha}-Fe phases, typical of a spring magnet structure. In the third project, intermetallic compounds of the type Zr{sub 1}Cr{sub 1}Fe{sub 1}T{sub 0.8} with T=Al, Co and Fe were subjected to hydrogenation. In the fourth project, we performed three crucial experiments. In the first experiment, we subjected a mixture of Fe{sub 3}O{sub 4} and Fe(80-20 wt%) to mechanochemical activation by high-energy ball milling, for time periods ranging from 0.5 to 14 hours. In the second experiment, we ball-milled Fe{sub 3}O{sub 4}:Co{sup 2+} (x=0.1) for time …
Date:
May 7, 2003
Creator:
Sorescu, Professor Monica
Object Type:
Report
System:
The UNT Digital Library
Structure-dependent hydrostatic deformation potentials of individual single-walled carbon nanotubes
Summary: The hydrostatic pressure coefficients of interband transition energies of a number of single-walled carbon nanotubes with different chiralities were measured. Both optical absorption and photoluminescence experiments were performed on de-bundled, single-walled carbon nanotube suspensions with hydrostatic pressure applied by diamond anvil cells. The pressure coefficients of the first van Hove transition (bandgap) energies are negative and dependent on the nanotube structure, while the second van Hove transitions are much less sensitive to hydrostatic pressure. The hydrostatic deformation potentials of individual nanotubes are deduced within an elastic model. An empirical equation that relates the pressure coefficients to nanotube structure is presented and discussed.
Date:
November 7, 2003
Creator:
Wu, J.; Walukiewicz, W.; Shan, W.; Bourret-Courchesne, E. D.; Ager, J. W., III; Yu, K. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Electrochemical characterization of manganese oxide cathode materials based on Na{sub 0.4}MnO{sub 2}
None
Date:
October 7, 2003
Creator:
Hu, Felix & Doeff, Marca M.
Object Type:
Article
System:
The UNT Digital Library
Application of Chemically Accelerated Biotreatment to Reduce Riskin Oil-Impacted Soils: Final Report
The drilling and operation of gas/petroleum exploratory wells and the operations of natural gas and petroleum production wells generate a number of waste materials that are usually stored and/or processed at the drilling/operations site. Contaminated soils result from drilling operations, production operations, and pipeline breaks or leaks where crude oil and petroleum products are released into the surrounding soil or sediments. In many cases, intrinsic biochemical remediation of these contaminated soils is either not effective or is too slow to be an acceptable approach. This project targeted petroleum-impacted soil and other wastes, such as soil contaminated by: accidental release of petroleum and natural gas-associated organic wastes from pipelines or during transport of crude oil or natural gas; production wastes (such as produced waters, and/or fuels or product gas). Our research evaluated the process designated Chemically-Accelerated Biotreatment (CAB) that can be applied to remediate contaminated matrices, either on-site or in situ. The Gas Technology Institute (GTI) had previously developed a form of CAB for the remediation of hydrocarbons and metals at Manufactured Gas Plant (MGP) sites and this research project expanded its application into Exploration and Production (E&P) sites. The CAB treatment was developed in this project using risk-based endpoints, a.k.a. …
Date:
January 7, 2003
Creator:
Paterek, J.R.; W.W.Bogan; Trbovic, V. & Sullivan, W.
Object Type:
Report
System:
The UNT Digital Library
Simulations of ion beam neutralization in support of theneutralized transport experiment
Heavy ion fusion (HIF) requires the acceleration, transport, and focusing of many individual ion beams. Drift compression and beam combining prior to focusing result in {approx}100 individual ion beams with line-charge densities of order 10{sup -5} C/m. A focusing force is applied to the individual ion beams outside of the chamber. For neutralized ballistic chamber transport (NBT), these beams enter the chamber with a large radius (relative to the target spot size) and must overlap inside the chamber at small radius (roughly 3-mm radius) prior to striking the target. The physics of NBT, in particular the feasibility of achieving the required small spot size, is being examined in the Neutralized Transport Experiment (NTX) at Lawrence Berkeley National Laboratory. Interpreted by detailed particle-in-cell simulations of beam neutralization, experimental results are being used to validate theoretical and simulation models for driver scale beam transport. In the NTX experiment, a low-emittance 300-keV, 25-mA K{sup +} beam is focused 1 m downstream into a 4-cm radius pipe containing one or more plasma regions. The beam passes through the first 10-cm-long plasma, produced by an Al plasma arc source, just after the final focus magnet and propagates with the entrained electrons. A second, 10-cm-long plasma …
Date:
September 7, 2003
Creator:
Welch, D. R.; Rose, D. V.; Yu, S. S. & Henestroza, E.
Object Type:
Article
System:
The UNT Digital Library
The Creation of the Science Commission
For 155 years, the Smithsonian Institution has had as its mission "the increase and diffusion of knowledge." Given the important questions facing the scientific world today, the existing level of institutional financial and physical resources, the strengths of the Institution's people and its collections, how should the Smithsonian set priorities for scientific research in the years ahead and, in general, carry out its historic mission more effectively? 1) How should scientific research be organized to optimize the use of the Institution's human, physical and financial resources? 2) How should the performance of scientific research by individuals and research departments be evaluated? 3) How can the relationship between research and public programming be enhanced? 4) What suggestions, of any type might the Science Commission have to strengthen research at the Smithsonian? 5) What should be the qualifications of those chosen to lead key scientific research units of the Smithsonian? 6) What should be done to enhance public recognition of Smithsonian science?
Date:
January 7, 2003
Creator:
Smithsonian Institution Science Commission
Object Type:
Website
System:
The UNT Digital Library
Cross-calibrating Spatial Positions of Light-viewing Diagnostics using Plasma Edge Sweeps in DIII-D
An experimental technique is presented that permits diagnostics viewing light from the plasma edge to be spatially calibrated relative to one another. By sweeping the plasma edge, each chord of each diagnostic sweeps out a portion of the light emission profile. A nonlinear least-squares fit to such data provides superior cross-calibration of diagnostics located at different toroidal locations compared with simple surveying. Another advantage of the technique is that it can be used to monitor the position of viewing chords during an experimental campaign to ensure that alignment does not change over time. Moreover, should such a change occur, the data can still be cross-calibrated and its usefulness retained.
Date:
July 7, 2003
Creator:
Solomon, W.M.; Burrell, K.H.; Gohil, P.; Groebner, R. & Kaplan, D.
Object Type:
Report
System:
The UNT Digital Library
Oxidative Mineralization and Characterization of Polyvinyl Alcohol Solutions for Wastewater Treatment
Photochemical and ultrasonic treatment of polyvinyl alcohol (PVA), derived from PVA fabric material, with hydrogen peroxide was evaluated as a primary method for PVA mineralization into simpler organic molecules. PVA-based waste streams have been found to be compatible with nuclear process wastewater treatment facilities only when solubilized PVA is more than 90 percent mineralized with hydrogen peroxide. No undesirable solid particles are formed with other nuclear process liquid waste when they are mixed, pH adjusted, evaporated and blended with this type of oxidized PVA waste streams. The presence of oxidized PVA in a typical nuclear process wastewater has been found to have no detrimental effect on the efficiency of ion exchange resins, inorganic, and precipitation agents used for the removal of radionuclides from nuclear waste streams. The disappearance of PVA solution in hydrogen peroxide with ultrasonic/ ultraviolet irradiation treatment was characterized by pseudo-first-order reaction kinetics. Radioactive waste contaminated PVA fabric can be solubilized and mineralized to produce processible liquid waste, hence, no bulky solid waste disposal cost can be incurred and the radionuclides can be effectively recovered. Therefore, PVA fabric materials can be considered as an effective substitute for cellulose fabrics that are currently used in radioactive waste decontamination processes.
Date:
August 7, 2003
Creator:
Oji, L.N.
Object Type:
Article
System:
The UNT Digital Library
FY03 Annual Report for Environmental Management Science Program - Strategic Design and Optimization of Inorganic Sorbents for Cesium, Strontium, and Actinides
The basic science goal in this project identifies structure/affinity relationships for selected radionuclides and existing sorbents. The task will apply this knowledge to the design and synthesis of new sorbents that will exhibit increased cesium, strontium and actinide removal. The target problem focuses on the treatment of high-level nuclear wastes. The general approach can likewise be applied to non-radioactive separations.
Date:
August 7, 2003
Creator:
Hobbs, D. T.
Object Type:
Report
System:
The UNT Digital Library
Cooling of electronics in collider experiments
Proper cooling of detector electronics is critical to the successful operation of high-energy physics experiments. Collider experiments offer unique challenges based on their physical layouts and hermetic design. Cooling systems can be categorized by the type of detector with which they are associated, their primary mode of heat transfer, the choice of active cooling fluid, their heat removal capacity and the minimum temperature required. One of the more critical detector subsystems to require cooling is the silicon vertex detector, either pixel or strip sensors. A general design philosophy is presented along with a review of the important steps to include in the design process. Factors affecting the detector and cooling system design are categorized. A brief review of some existing and proposed cooling systems for silicon detectors is presented to help set the scale for the range of system designs. Fermilab operates two collider experiments, CDF & D0, both of which have silicon systems embedded in their detectors. A review of the existing silicon cooling system designs and operating experience is presented along with a list of lessons learned.
Date:
November 7, 2003
Creator:
al., Richard P. Stanek et
Object Type:
Article
System:
The UNT Digital Library
Effects of 108 Days Tritium Exposure on UHMW-PE, PTFE, and Vespel(R)
Samples of three polymers, Ultra-High Molecular Weight Polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), also known as Teflon(R), and Vespel(R) polyimide were exposed to 1 atmosphere of tritium gas at ambient temperature for 108 days. Sample mass and size measurements to calculate density, spectra-colorimetry, dynamic mechanical analysis (DMA), and Fourier-transform infrared spectroscopy (FT-IR) were employed to characterize the effects of this exposure on these samples. This technical report is the first report from this research program.
Date:
January 7, 2003
Creator:
Clark, E.A.
Object Type:
Report
System:
The UNT Digital Library
Estimate of Legacy Tritium in Building 232-H Tritium Facility, Savannah River Site
This report describes an estimate of how much tritium will be held up in those parts of the 232-H process that will remain in the building after deactivation The anticipated state of this tritium is also discussed. This information will be used to assess the radiological status of the deactivated facility.
Date:
January 7, 2003
Creator:
Clark, E.A.
Object Type:
Report
System:
The UNT Digital Library
DIRECT ENERGY CONVERSION FISSION REACTOR ANNUAL REPORT FOR THE PERIOD OCTOBER 1, 2001 THROUGH DECEMBER 31, 2002
OAK-B135 DIRECT ENERGY CONVERSION FISSION REACTOR ANNUAL REPORT FOR THE PERIOD OCTOBER 1, 2001 THROUGH DECEMBER 31, 2002
Date:
April 7, 2003
Creator:
BROWN, L.C.
Object Type:
Report
System:
The UNT Digital Library