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29,770 Matching Results
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NMR Studies of Molecular Hydrogen in Hydrogenated Amorphous Silicon
Using NMR, the concentrations of molecular hydrogen have been measured directly in hydrogenated amorphous silicon made by the hot wire chemical vapor deposition (HWCVD) technique.
Date:
January 1, 2000
Creator:
Su, T.; Chen, S.; Taylor, P. C.; Crandall, R. S. & Mahan, A. H.
Object Type:
Article
System:
The UNT Digital Library
Non-linear Electron Transport Kinetics in Nanocrystalline TiO(2) Based Solar Cells
An analytical model describing electron transport in dye-sensitized nanocrystalline TiO(2) solar cells is shown to account for the non-linear dependence of the electron transport rate on the electron concentration. Equations relating the influenece of an exponential distribtuion of surface states to electron transport are derived and verified by intensity-modulated photocurrent spectroscopy measurements. A slope of 69 meV is inferred for the surface-state distribution curve.
Date:
January 1, 2000
Creator:
van de Lagemaat, J. & Frank, A. J.
Object Type:
Article
System:
The UNT Digital Library
Nondestructive Characterization of Atomic Profiles in Layer-Structured Photovoltaic Materials Using the Method of Angular Dependence of X-Ray Fluorescence (ADXRF)
Angular dependence of x-ray fluorescence technique has been applied to the study of atomic density profile in composite systems. This method is shown to be useful for probing the microstructures and intermixing of constituent elements in layer-structured photovoltaic materials.
Date:
January 1, 2000
Creator:
Kim, S.; Soo, Y. L.; Kioseoglou, G.; Huang, S.; Kao, Y. H.; Ramanathan, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Novel CdTe Cell Fabrication Process with Potential for Low Cost and High Throughput
There are several production disadvantages inherent in the conventional SnO(2)/CdS/CdTe manufacturing processes. In this paper, we report a novel manufacturing process for fabrication of polycrystalline Cd(2)SnO(4)/Zn(2)/SnO(4)/CdS/CdTe thin-film solar cells that yielded a CdS/CdTe device with an NREL-confirmed efficiency of 14.0%.
Date:
January 1, 2000
Creator:
Wu, X. & Sheldon, P.
Object Type:
Article
System:
The UNT Digital Library
Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Status Report
OAK-B135 Novel Investigation of Iron Cross Sections via Spherical Shell Transmission Measurements and Particle Transport Calculations for Material Embrittlement Studies. Status Report
Date:
January 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
NPL 1999 Annual Report
OAK-B135 NPL 1999 Annual Report. The Nuclear Physics Laboratory at the University of Washington in Seattle pursues a broad program of nuclear physics research. Research activities are conducted locally and at remote sites. The current program includes ''in-house'' research on nuclear collisions using the local tandem Van de Graaff and superconducting linac accelerators as well as local and remote non-accelerator research on fundamental symmetries and weak interactions and user-mode research on relativistic heavy ions at large accelerator facilities around the world.
Date:
January 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The NREL Outdoor Accelerated-Weathering Tracking System Photovoltaic Module Exposure Results
Status results are presented for the Outdoor Accelerated-Weathering Tracking System (OATS) first study on photovoltaic (PV) modules. Studies began in November 1997 on pairs of commercially available crystalline silicon and amorphous silicon (a-Si) PV modules kept at constant resistive load.
Date:
January 1, 2000
Creator:
Basso, T. S.
Object Type:
Article
System:
The UNT Digital Library
Nuclear energy and security
Nuclear power is an important and, the authors believe, essential component of a secure nuclear future. Although nuclear fuel cycles create materials that have some potential for use in nuclear weapons, with appropriate fuel cycles, nuclear power could reduce rather than increase real proliferation risk worldwide. Future fuel cycles could be designed to avoid plutonium production, generate minimal amounts of plutonium in proliferation-resistant amounts or configurations, and/or transparently and efficiently consume plutonium already created. Furthermore, a strong and viable US nuclear infrastructure, of which nuclear power is a large element, is essential if the US is to maintain a leadership or even participatory role in defining the global nuclear infrastructure and controlling the proliferation of nuclear weapons. By focusing on new fuel cycles and new reactor technologies, it is possible to advantageously burn and reduce nuclear materials that could be used for nuclear weapons rather than increase and/or dispose of these materials. Thus, the authors suggest that planners for a secure nuclear future use technology to design an ideal future. In this future, nuclear power creates large amounts of virtually atmospherically clean energy while significantly lowering the threat of proliferation through the thoughtful use, physical security, and agreed-upon transparency of …
Date:
January 1, 2000
Creator:
Blejwas, Thomas E.; Sanders, Thomas L.; Eagan, Robert J. & Baker, Arnold B.
Object Type:
Article
System:
The UNT Digital Library
Nuclear Energy Research Initiative (NERI) Program Continuous Fiber Wound Ceramic Composite (CFCC) for Commercial Water Reactor Fuel-Technical Progress Report
Our program began on August 1, 1999. As of January 1, 2000, the progress has been in contracting, materials selection, and test planning. All 3 subcontracts are now in place (McDermott Technologies Inc. for ceramic fabrication, Swales Aerospace for LOCA testing, and Massachusetts Institute of Technology for in Reactor testing). With regard to material selection, we visited McDermott Technologies on December 6, 1999 to discuss the progress on Materials Selection and issues regarding Permeability Reduction in CFCC materials. We are evaluating several options for reducing the permeability of the CFCC materials, including Chemical Vapor Infiltration. McDermott Technologies is approximately two months late on their scheduled delivery to Gamma of Materials Selection reports. They have indicated by letter that they plan to deliver a draft and then final Materials Selection Report to Gamma by January 15 and February 1st, 2000, respectively. With regard to Test Planning, Swales Aerospace is proceeding with engineering the test chamber. The power supply selection for the Kanthal furnace was changed from AC to DC current to simplify equipment and operation. The mechanism for opening the ''sliding door'' on bottom of furnace has been changed from air cylinder to stainless steel spring/cord to provide inherent simplicity and …
Date:
January 1, 2000
Creator:
Feinroth, Herbert
Object Type:
Report
System:
The UNT Digital Library
Nucleon electromagnetic form factors
A review of data on the nucleon electromagnetic form factors in the space-like region is presented. Recent results from experiments using polarized beams and polarized targets or nucleon recoil polarimeters have yielded a significant improvement on the precision of the data obtained with the traditional Rosenbluth separation. Future plans for extended measurements are outlined.
Date:
January 1, 2000
Creator:
Jager, Kees de
Object Type:
Article
System:
The UNT Digital Library
NY/NJ distributed wind power field verification project. Quarterly report for the period November - December 1999
This report details the Significant Accomplishments for this quarter. The accomplishments are: (1) began preparations for host site installations; and (2) data acquisition system installation at the National Wind Technology Center (NWTC) near Boulder, CO.
Date:
January 1, 2000
Creator:
Putnam, Robert Jr.
Object Type:
Report
System:
The UNT Digital Library
On the Automatic Generation of Plans for Life Cycle Assembly Processes
Designing products for easy assembly and disassembly during their entire life cycles for purposes including product assembly, product upgrade, product servicing and repair, and product disposal is a process that involves many disciplines. In addition, finding the best solution often involves considering the design as a whole and by considering its intended life cycle. Different goals and manufacturing plan selection criteria, as compared to initial assembly, require re-visiting significant fundamental assumptions and methods that underlie current assembly planning techniques. Previous work in this area has been limited to either academic studies of issues in assembly planning or to applied studies of life cycle assembly processes that give no attention to automatic planning. It is believed that merging these two areas will result in a much greater ability to design for, optimize, and analyze the cycle assembly processes. The study of assembly planning is at the very heart of manufacturing research facilities and academic engineering institutions; and, in recent years a number of significant advances in the field of assembly planning have been made. These advances have ranged from the development of automated assembly planning systems, such as Sandia's Automated Assembly Analysis System Archimedes 3.0{copyright}, to the startling revolution in microprocessors …
Date:
January 1, 2000
Creator:
CALTON,TERRI L.
Object Type:
Report
System:
The UNT Digital Library
Open cycle thermoacoustics
A new type of thermodynamic device combining a thermodynamic cycle with the externally applied steady flow of an open thermodynamic process is discussed and experimentally demonstrated. The gas flowing through this device can be heated or cooled in a series of semi-open cyclic steps. The combination of open and cyclic flows makes possible the elimination of some or all of the heat exchangers (with their associated irreversibility). Heat is directly exchanged with the process fluid as it flows through the device when operating as a refrigerator, producing a staging effect that tends to increase First Law thermodynamic efficiency. An open-flow thermoacoustic refrigerator was built to demonstrate this concept. Several approaches are presented that describe the physical characteristics of this device. Tests have been conducted on this refrigerator with good agreement with a proposed theory.
Date:
January 1, 2000
Creator:
Reid, Robert Stowers
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Optical measurement of photosensitizer concentration using a probe with a small source-detector separation
None
Date:
January 1, 2000
Creator:
Canpolat, M. & Mourant, J. R.
Object Type:
Article
System:
The UNT Digital Library
OPTIMIZING THE METALLOID CONTENT IN BULK METALLIC GLASSES
None
Date:
January 1, 2000
Creator:
JIN, O.; SCHWARZ, R. B. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with B. C. Peters, January 1, 2000
The National Museum of the Pacific War presents an interview with B C Peters. Peters joined the Navy in September of 1942. He served with the 31st Seabee Battalion. From 1942 to 1943 he worked in Bermuda, building a refueling station as well as working with a survey crew. He worked on surveys for the construction of a submarine dock at St. Georges and a military highway near Hamilton. He was transferred to Camp Endicott, Rhode Island, where he was trained as Crew Chief of an 81mm mortar squad and his survey party made a topographic map of the area. They were later assigned to the mountains of Hawaii and he describes his living conditions there, and the scenery. They completed physical training and trained aboard an LCM as well. They traveled to Eniwetok and Iwo Jima. He provides great detail of landing at Iwo Jima and the battle that ensued. Peters’ group was there to repair the airfield closest to Mt. Suribachi, and then set up shop in foxholes on the island. He provides great detail of his experiences there. He assisted with the surveying and engineering of another airfield and describes his involvement. After Iwo Jima he returned …
Date:
January 1, 2000
Creator:
Peters, B. C.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with B. C. Peters, January 1, 2000
The National Museum of the Pacific War presents an interview with B C Peters. Peters joined the Navy in September of 1942. He served with the 31st Seabee Battalion. From 1942 to 1943 he worked in Bermuda, building a refueling station as well as working with a survey crew. He worked on surveys for the construction of a submarine dock at St. Georges and a military highway near Hamilton. He was transferred to Camp Endicott, Rhode Island, where he was trained as Crew Chief of an 81mm mortar squad and his survey party made a topographic map of the area. They were later assigned to the mountains of Hawaii and he describes his living conditions there, and the scenery. They completed physical training and trained aboard an LCM as well. They traveled to Eniwetok and Iwo Jima. He provides great detail of landing at Iwo Jima and the battle that ensued. Peters’ group was there to repair the airfield closest to Mt. Suribachi, and then set up shop in foxholes on the island. He provides great detail of his experiences there. He assisted with the surveying and engineering of another airfield and describes his involvement. After Iwo Jima he returned …
Date:
January 1, 2000
Creator:
Peters, B. C.
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with Ruth Bennett, January 1, 2000
The National Museum of the Pacific War presents an oral interview with Ruth Bennett. Bennett grew up in Texas. She worked in Big Spring as a personnel secretary and married an officer in the Air Force.
Date:
January 1, 2000
Creator:
Bennett, Ruth
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Ruth Bennett, January 1, 2000
The National Museum of the Pacific War presents an oral interview with Ruth Bennett. Bennett grew up in Texas. She worked in Big Spring as a personnel secretary and married an officer in the Air Force.
Date:
January 1, 2000
Creator:
Bennett, Ruth
Object Type:
Text
System:
The Portal to Texas History
The overlap-Dirac operator: Topology and chiral symmetry breaking
The authors review the spectral flow techniques for computing the index of the overlap Dirac operator including results relevant for SUSY Yang-Mills theories. They describe properties of the overlap Dirac operator, and methods to implement it numerically. They use the results from the spectral flow to illuminate the difficulties in numerical calculations involving domain wall and overlap fermions.
Date:
January 1, 2000
Creator:
Edwards, R.G.; Heller, U.M. & Narayanan, R.
Object Type:
Article
System:
The UNT Digital Library
Overview of NWIS software
The Nuclear Weapons Identification System (NWIS) is a system that performs radiation signature measurements on objects such as nuclear weapons components. NWIS consists of a {sup 252} Cf fission source, radiation detectors and associated analog electronics, data acquisition boards, and computer running Windows NT and the application software. NWIS uses signal processing techniques to produced a radiation signature from the radiation emitted from the object. The signature can be stored and later compared to another signature to determine whether two objects are similar. A library of such signatures can be used to identify objects in closed containers as well as determine such attributes as fissile mass and it some cases enrichment. There are three executables built from the software: (1) Windows NT kernel-mode device driver; (2) data acquisition application; and (3) data analysis application. The device driver is the interface between the NWIS data acquisition boards and the remainder o f the software. The data acquisition executable is the user's tool for making an NWIS measurement; it has limited data display abilities. The data analysis executable is a user's tool for displaying an NWIS measurement, including matching it to other NWIS measurements. A users manual for the software is included.
Date:
January 1, 2000
Creator:
Mullens, J. A. & Mihalczo, J. T.
Object Type:
Report
System:
The UNT Digital Library
Oxidation, Volatilization, and Redistribution of Molybdenum from TZM Alloy in Air
The excellent high temperature strength and thermal conductivity of molybdenum-base alloys provide attractive features for components in advanced magnetic and inertial fusion devices. Refractory metal alloys react readily with oxygen and other gases. Oxidized molybdenum in turn is susceptible to losses from volatile molybdenum trioxide species, (MoO3)m, in air and the hydroxide, MoO2(OH)2, formed from water vapor. Transport of radioactivity by the volatilization, migration, and re-deposition of these volatile species during a potential accident involving a loss of vacuum or inert environment represents a safety issue. In this report we present experimental results on the oxidation, volatilization and re-deposition of molybdenum from TZM in flowing air between 400 and 800°C. These results are compared with calculations obtained from a vaporization mass transfer model using chemical thermodynamic data for vapor pressures of MoO3(g) over pure solid MoO3 and an expression for the vapor pressures of MoO2(OH)2 from the literature. Calculations correlate well with experimental data.
Date:
January 1, 2000
Creator:
Smolik, Galen Richard; Petti, David Andrew; Mccarthy, Kathryn Ann & Schuetz, Stanley Thomas
Object Type:
Report
System:
The UNT Digital Library
Oxidation, volatilization, and redistribution of molybdenum from TZM alloy in air
The excellent high temperature strength and thermal conductivity of molybdenum-base alloys provide attractive features for components in advanced magnetic and inertial fusion devices. Refractory metal alloys react readily with oxygen and other gases. Oxidized molybdenum in turn is susceptible to losses from volatile molybdenum trioxide species, MoO{sub 3}(m), in air and the hydroxide, MoO{sub 2}(OH){sub 2}, formed from water vapor. Transport of radioactivity by the volatilization, migration, and re-deposition of these volatile species during a potential accident involving a loss of vacuum or inert environment represents a safety issue. In this report the authors present experimental results on the oxidation, volatilization and re-deposition of molybdenum from TZM in flowing air between 400 and 800 C. These results are compared with calculations obtained from a vaporization mass transfer model using chemical thermodynamic data for vapor pressures of MoO{sub 3}(g) over pure solid MoO{sub 3} and an expression for the vapor pressures of MoO{sub 2}(OH){sub 2} from the literature. Calculations correlate well with experimental data.
Date:
January 1, 2000
Creator:
Smolik, G. R.; Petti, D. A.; McCarthy, K. A. & Schuetz, S. T.
Object Type:
Report
System:
The UNT Digital Library
PARALLEL IMAGE PROCESSING WITH AUTOWAVES: SEGMENTATION AND EDGE EXTRACTION
None
Date:
January 1, 2000
Creator:
SKOURIKHINE, A. N.
Object Type:
Article
System:
The UNT Digital Library