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Copper in Contacts to CdTe
Cu from the back contact of a polycrystalline CdS/CdTe solar cell does more than assist in forming a low-resistance contact.
Date:
January 1, 2000
Creator:
Gessert, T. A.; Asher, S.; Narayanswamy, C. & Rose, D.
Object Type:
Article
System:
The UNT Digital Library
Corrosion/Electrochemistry of Monocrystalline and Polycrystalline Beryllium in Aqueous Chloride Environment
Corrosion characteristics of high-purity polycrystalline beryllium as a function of pH and NaCl concentration were studied at 25 C, using cyclic polarization tests. Single crystal beryllium specimens oriented close to the (0001), (1010), and (1120) planes using Laue back reflection techniques were studied using cyclic polarization tests in 0.01M NaCl with a nominal pH of 7. Pit morphology of the polycrystalline and single crystals was studied using conventional scanning electron microscopy. On the polycrystalline specimens, passivity appears to be more a function of solution pH than of chloride concentration. Single crystal studies show dramatic differences in cyclic polarization plots and SEM micrographs. The two prism planes (1010) and (1120) behave similarly while the basal plane (0001) behaved in a substantially different manner.
Date:
January 1, 2000
Creator:
Friedman, J. & Hanafee, J.E.
Object Type:
Report
System:
The UNT Digital Library
A coupled RELAPS-3D/CFD methodology with a proof-of-principle calculation
The RELAP5-3D computer code was modified to make the explicit coupling capability in the code fully functional. As a test of the modified code, a coupled RELAP5/RELAP5 analysis of the Edwards-O'Brien blowdown problem was performed which showed no significant deviations from the standard RELAP5-3D predictions. In addition, a multiphase Computational Fluid Dynamics (CFD) code was modified to permit explicit coupling to RELAP5-3D. Several calculations were performed with this code. The first analysis used the experimental pressure history from a point just upstream of the break as a boundary condition. This analysis showed that a multiphase CFD code could calculate the thermodynamic and hydrodynamic conditions during a rapid blowdown transient. Finally, a coupled RELAP5/CFD analysis was performed. The results are presented in this paper.
Date:
January 1, 2000
Creator:
Aumiller, D. L.; Tomlinson, E. T. & Bauer, R. C.
Object Type:
Report
System:
The UNT Digital Library
Cross-Section AFM and EFM Examination of Thin-Film Solar Cells
We demonstrated the feasibility of analyzing cross sections of thin-film CdTe/CdS and CIGS/CdS solar cells using atomic force microscopy (AFM).
Date:
January 1, 2000
Creator:
Moutinho, H. R.; Ballif, C.; Al-Jassim, M. M.; Dhere, R. G. & Kazmerski, L. L.
Object Type:
Article
System:
The UNT Digital Library
Cryogenics Vision Workshop for High-Temperature Superconducting Electric Power Systems Proceedings
The US Department of Energy's Superconductivity Program for Electric Systems sponsored the Cryogenics Vision Workshop, which was held on July 27, 1999 in Washington, D.C. This workshop was held in conjunction with the Program's Annual Peer Review meeting. Of the 175 people attending the peer review meeting, 31 were selected in advance to participate in the Cryogenics Vision Workshops discussions. The participants represented cryogenic equipment manufactures, industrial gas manufacturers and distributors, component suppliers, electric power equipment manufacturers (Superconductivity Partnership Initiative participants), electric utilities, federal agencies, national laboratories, and consulting firms. Critical factors were discussed that need to be considered in describing the successful future commercialization of cryogenic systems. Such systems will enable the widespread deployment of high-temperature superconducting (HTS) electric power equipment. Potential research, development, and demonstration (RD and D) activities and partnership opportunities for advancing suitable cryogenic systems were also discussed. The workshop agenda can be found in the following section of this report. Facilitated sessions were held to discuss the following specific focus topics: identifying Critical Factors that need to be included in a Cryogenics Vision for HTS Electric Power Systems (From the HTS equipment end-user perspective) identifying R and D Needs and Partnership Roles (From the cryogenic …
Date:
January 1, 2000
Creator:
Energetics, Inc.
Object Type:
Report
System:
The UNT Digital Library
Crystalline Silicon Materials Research
Our recent silicon photovoltaic (PV) materials research activities are summarized.
Date:
January 1, 2000
Creator:
Ciszek, T.; Wang, T. H.; Page, M.; Landry, M.; Casey, J.; Bauer, R. et al.
Object Type:
Article
System:
The UNT Digital Library
CuIn(1-x)Ga(x)Se-Based Solar Cells prepared from Electrodeposited and Electroless-Deposited Precursors
Three devices were fabricated from electrodeposited (ED) and electroless-deposited (EL) precursors. Compositions were adjusted with additional In and Ga by physical vapor deposition (PVD) for an ED and an EL device.
Date:
January 1, 2000
Creator:
Batchelor, W. K. & Bhattacharya, R. N.
Object Type:
Article
System:
The UNT Digital Library
Customers are Riding DART Into the millennium!
News release commemorating the inauguration of a new millennium and informing customers about a light rail delay caused by the large number of New Year's celebrants and DART's schedule for the holiday.
Date:
January 1, 2000
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
[Denton City Hall with Ice]
Photograph of the sign in front of Denton City Hall (215 E. McKinney Street) after an ice storm with ice hanging from the branches of nearby shrubs and trees and frost covering the ground. The old and new Denton Post Office can be seen in the background, as well as City Hall West in the distance.
Date:
January 1, 2000
Creator:
Cabrales, John
Object Type:
Photograph
System:
The Portal to Texas History
Dependence of the Characteristics of Mo Films on Sputter Conditions
The residual stress, resistance, orientation, and microstructure of sputtered Mo films were studied as a function of varied-deposition power and pressure.
Date:
January 1, 2000
Creator:
Alleman, J. L.; Althani, H.; Noufi, R.; Moutinho, H.; Al-Jassim, M. M. & Hasoon, F.
Object Type:
Article
System:
The UNT Digital Library
THE DESIGN-BUILD APPROACH FOR DOE NUCLEAR FACILITIES: CAN COMPLIANCE WITH 10CFR835 ALARA REQUIREMENTS BE ACHIEVED?
None
Date:
January 1, 2000
Creator:
MORGAN, R.
Object Type:
Article
System:
The UNT Digital Library
Design of the Core 2-4 GHz Betatron Equalizer
The core betatron equalizer in the Accumulator in the Antiproton Source at Fermilab needed to be upgraded. The performance could be rated as only circa 650 MHz when the system was a 2 GHz system. The old equalizer did not correct for the strong phase mismatch for the relatively strong gain of the system slightly below 2 GHz. The design corrects this phase mismatch and is relatively well matched both in and out of band.
Date:
January 1, 2000
Creator:
Deibele, C.
Object Type:
Report
System:
The UNT Digital Library
Detailed Characterization of Si Substrates and Solar Cells with High-Speed PVSCAN
This paper describes some applications of PVSCAN-an instrument developed for rapid characterization of photovoltaic (PV) mateirals and devices. It measures defect distribution, reflectance, and external and internal responses of light beam induced current at two wavelengths of optical excitation.
Date:
January 1, 2000
Creator:
Sopori, B. L.; Chen, W.; Zhang, Y. & Madjdpour, J.
Object Type:
Article
System:
The UNT Digital Library
Detection and control of deposition on pendant tubes of Kraft chemical recovery boilers. Quarterly report for the period October - December 1999
Activities during the period continued to focus primarily on obtaining a clear image of deposits inside an operating recovery boiler.
Date:
January 1, 2000
Creator:
Kychakoff, George
Object Type:
Report
System:
The UNT Digital Library
Determination of Cu Concentrations in CdTe/CdS Devices by High Mass Resolution Secondary Ion Mass Spectrometry
We have used secondary ion mass spectrometry (SIMS) to quantitatively determine the concentration of Cu in CdTe/CdS devices. Empirical standards were fabricated by ion implantation of Cu into single-crystal and polycrystalline CdTe and single-crystal CdS.
Date:
January 1, 2000
Creator:
Asher, S. E.; Reedy, R. C.; Dhere, R.; Gessert, t. A. & Young, M. R.
Object Type:
Article
System:
The UNT Digital Library
Development of a health and safety manual for emergency response operations
The Federal Radiological Monitoring and Assessment Center (FRMAC) Health and Safety Manual, which has been under development by a multi-agency group, is nearing completion and publication. The manual applies to offsite monitoring during a radiological accident or incident. Though written for multi-agency offsite monitoring activities (FRMAC), the manual is generic in nature and should be readily adaptable for other emergency response operations. Health and safety issues for emergency response situations often differ from those of normal operations. Examples of these differences and methodologies to address these issues are discussed. Challenges in manual development, including lack of regulatory and guidance documentation, are also discussed. One overriding principle in the Health and Safety Manual development is the overall reduction of risk, not just dose. The manual is broken into several chapters, which include Overview of Responsibities, Health Physics, Industrial Hygiene and Safey, Medical, and Environmental Compliance and Records. Included is a series of appendices, which presents additional information on forms and plans for default scenarios.
Date:
January 1, 2000
Creator:
Riland, C.A. & Junio, S.S.
Object Type:
Article
System:
The UNT Digital Library
Development of an Accelerated Weathering Protocol using Weatherometers for Reliability Study of Mini-Modules and Encapsulation Materials
This paper describes the needs, reasoning, approaches, and technical details to establish a practical accelerated weathering test (AWT) protocol for indoor testing of the photothermal stability of encapsulation materials and encapsulated solar cells and minimodules.
Date:
January 1, 2000
Creator:
Pern, F. J.
Object Type:
Article
System:
The UNT Digital Library
DEVELOPMENT OF METER-LONG YBCO COATED CONDUCTORS PRODUCED BY ION BEAM ASSISTED DEPOSITION AND PULSED LASER DEPOSITION
None
Date:
January 1, 2000
Creator:
FOLTYN, S. R.; ARENDT, P. N. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Development of Seamless Niobium Cavities for Accelerator Application
In a recent contribution to PAC '99, we reported about results from experiments with single-cell and one five-cell seamless cavities, which had undergone various surface treatments such as buffered chemical polishing, tumbling, grinding and high temperature heat treatments. Q-values as high as 10{sup 11} and accelerating gradients up to E{_}acc = {approximately} 30 MV/m had been measured. In the last several months we have carried out several more experiments on additional cavities made from seamless tubes and the results are discussed in this contribution. Also, one of the cavities mentioned in the PAC contribution was electropolished and was tested after only high pressure rinsing and in-situ baking. Results from these experiments are reported in this contribution.
Date:
January 1, 2000
Creator:
Kneisel, P.; Palmieri, V. & Saito, K.
Object Type:
Article
System:
The UNT Digital Library
Diagnosis and correction of soil nutrient limitations in intensively managed Southern pine forests. Quarterly report, October-December 1999
None
Date:
January 1, 2000
Creator:
Comerford, N.B.
Object Type:
Report
System:
The UNT Digital Library
Dileptons from transport and hydrodynamical models
Transport and hydrodynamical models used to describe the expansion stage of a heavy-ion collision at the CERN SPS give different dilepton spectrum even if they are tuned to reproduce the observed hadron spectra. To understand the origin of this difference we compare the dilepton emission from transport and hydrodynamical models using similar initial states in both models. We find that the requirement of pion number conservation in a hydrodynamical model does not change the dilepton emission. Also the mass distribution from the transport model indicates faster cooling and longer lifetime of the fireball.
Date:
January 1, 2000
Creator:
Huovinen, P. & Koch, V.
Object Type:
Article
System:
The UNT Digital Library
Direct liquefaction proof-of-concept facility
The main objective of the U.S. DOE, Office of Fossil Energy, is to ensure the US a secure energy supply at an affordable price. An integral part of this program was the demonstration of fully developed coal liquefaction processes that could be implemented if market and supply considerations so required, Demonstration of the technology, even if not commercialized, provides a security factor for the country if it is known that the coal to liquid processes are proven and readily available. Direct liquefaction breaks down and rearranges complex hydrocarbon molecules from coal, adds hydrogen, and cracks the large molecules to those in the fuel range, removes hetero-atoms and gives the liquids characteristics comparable to petroleum derived fuels. The current processes being scaled and demonstrated are based on two reactor stages that increase conversion efficiency and improve quality by providing the flexibility to adjust process conditions to accommodate favorable reactions. The first stage conditions promote hydrogenation and some oxygen, sulfur and nitrogen removal. The second stage hydrocracks and speeds the conversion to liquids while removing the remaining sulfur and nitrogen. A third hydrotreatment stage can be used to upgrade the liquids to clean specification fuels.
Date:
January 1, 2000
Creator:
Comolli, Alfred G.; Zhou, Peizheng & Staff, HTI
Object Type:
Report
System:
The UNT Digital Library
DISPOSAL OF FLUIDIZED BED COMBUSTION ASH IN AN UNDERGROUND MINE TO CONTROL ACID MINE DRAINAGE AND SUBSIDENCE
This project will evaluate the technical, economic and environmental feasibility of filling abandoned underground mine voids with alkaline, advanced coal combustion wastes (Fluidized Bed Combustion-FBC ash). Success will be measured in terms of technical feasibility of the approach (i.e. % void filling), cost, environmental benefits (acid mine drainage and subsidence control) and environmental impacts (noxious ion release). This document reports on progress made during Phase III. The report is divided into three major sections. The first deals with the Hydraulic Injection component. This section of the report describes the progress and milestones associated with the grouting activities of the project. The Phase III tasks of Economic Analysis and Regulatory Analysis is covered under this section. The second component is Pneumatic Injection. This section reports on progress made towards completing the demonstration project. The last component involves evaluating the migration of contaminants through the grouted mine. A computer model has been developed in earlier phases and will model the flow of water in and around the grouted Longridge mine.
Date:
January 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
DOE-NABIR PI Workshop: Abstracts January 31-February 2, 2000
The mission of the NABIR program is to provide the scientific understanding needed to use natural processes and to develop new methods to accelerate those processes for the bioremediation of contaminated soils, sediments and groundwater at U.S. Department of Energy (DOE) facilities. The program is implemented through seven interrelated scientific research elements (Assessment, Bacterial Transport, Biogeochemical Dynamics, Bimolecular Science and Engineering, Biotransformation and Biodegradation, Community Dynamics/Microbial Ecology and System Engineering, Integration, Prediction and Optimization); and through an element called Bioremediation and its Societal Implications and Concerns (BASIC), which addresses societal issues and concerns of stakeholders through communication and collaboration among all relevant groups, including community leaders and representatives, engineers, scientists, lawyers, etc. The initial emphasis of NABIR program research is on the bioremediation of metals and radionuclides in the subsurface below the root zone, including both thick vadose and saturated zones. The material presented at this year's workshop focuses on research funded in FY 1998-2000 by DOE's Office of Science through its Office of Biological and Environmental Research. Sixty-eight projects have been funded in the scientific program elements, and two have been funded in the BASIC program. Abstracts of these programs are summarized in this booklet, along with abstracts of …
Date:
January 1, 2000
Creator:
Pratt, Mary (ed.)
Object Type:
Article
System:
The UNT Digital Library