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open access

New Concepts for High-Intensity PV Modules for Use with Dish Concentrator Systems

Description: In this paper we report on our efforts to fabricate monolithically interconnected modules (MIMS) from GaAs device structures. The small size of the component cells comprising the MIM allows for operation at very high flux densities. This relaxes the requirement for a small spot-size to be generated by the optics. The devices are grown on semi-insulating substrates, allowing the incorporation of an extremely efficient back surface reflector (BSR). This BSR is an effective tool for thermal manage… more
Date: October 6, 1998
Creator: Ward, J. S.; Duda, A.; Coutts, T. J. & Kurtz, S. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of Graphical User Interfaces to Visualize Meteorological Data

Description: The availability of meteorological data in various forms has increased in recent years due to improved communication and expanded computational storage. At the Savannah River Technology Center of the Savannah River Site, a considerable amount of data form Weather Services International is collected and archived on a daily basis.
Date: October 6, 1998
Creator: Buckley, Robert L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Predictive Models for the Determination of Pitting Corrosion Versus Inhibitor Concentrations and Temperature for Radioactive Sludge in Carbon Steel Waste Tanks

Description: Statistical models have been developed to predict the occurrence of pitting corrosion in carbon steel waste storage tanks exposed to radioactive nuclear waste. The levels of nitrite concentrations necessary to inhibit pitting at various temperatures and nitrate concentrations were experimentally determined via electrochemical polarization and coupon immersion corrosion tests. Models for the pitting behavior were developed based on various statistical analyses of the experimental data. Feed-forw… more
Date: October 6, 1998
Creator: Mickalonis, J.I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Office of Inspector General report on audit of Southwestern Federal Power System combined financial statements and supplemental schedules (with independent auditors` reports thereon) for the years ended September 30, 1997 and 1996

Description: Southwestern Federal Power System (SWFPS) encompasses the operation of 24 hydroelectric power plants by the US Army Corps of Engineers and the marketing of power and energy from those plants by the Southwestern Power Administration (Southwestern) of the US Department of Energy. This report presents the results of the independent certified public accountants` audit of the SWFPS`s combined power system statements of assets, Federal investments and liabilities, and the related combined statements … more
Date: October 6, 1998
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of ultraviolet radiation, ozone and aerosol interactions in the troposphere using automatic differentiation. Final report

Description: A major goal of this research was to quantify the interactions between UVR, ozone and aerosols. One method of quantification was to calculate sensitivity coefficients. A novel aspect of this work was the use of Automatic Differentiation software to calculate the sensitivities. The authors demonstrated the use of ADIFOR for the first time in a dimensional framework. Automatic Differentiation was used to calculate such quantities as: sensitivities of UV-B fluxes to changes in ozone and aerosols i… more
Date: October 6, 1998
Creator: Carmichael, G.R. & Potra, F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Efficient Control Law Simulation for Multiple Mobile Robots

Description: In this paper we consider the problem of simulating simple control laws involving large numbers of mobile robots. Such simulation can be computationally prohibitive if the number of robots is large enough, say 1 million, due to the 0(N2 ) cost of each time step. This work therefore uses hierarchical tree-based methods for calculating the control law. These tree-based approaches have O(NlogN) cost per time step, thus allowing for efficient simulation involving a large number of robots. For concr… more
Date: October 6, 1998
Creator: Driessen, B. J.; Feddema, J. T.; Kotulski, J. D. & Kwok, K. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Effect of High-Resistance SnO2 on CdS/CdTe Device Performance

Description: In this paper, we have studied the effect of high-resistance SnO2 buffer layers, deposited by low-pressure chemical-vapor deposition, on CdS/CdTe device performance. Our results indicate that when CdS/CdTe devices have a very thin layer of CdS or no CdS at all, the i-SnO2 buffer layer helps to increase device efficiency. When the CdS layer is thicker than 600{angstrom}, the device performance is dominated by CdS thickness, not the i-SnO2 layer. If a very thin CdS layer is to be used to enhance … more
Date: October 6, 1998
Creator: Li, W.; Ribelin, R.; Mahathongdy, Y.; Albin, D.; Dhere, R.; Rose, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Micro-Fluidic Diffusion Coefficient Measurement

Description: A new method for diffusion coefficient measurement applicable to micro-fluidics is pre- sented. The method Iltilizes an analytical model describing laminar dispersion in rect- anglllar ~llicro_channe]s. The Illethod ~vas verified throllgh measllremen~ of fllloresceill diffusivity in water and aqueolls polymer solutions of differing concentration. The diffll- sivity of flllorescein was measlmed as 0.64 x 10-gm2/s in water, 0.49 x 10-gm2/s in the 4 gm/dl dextran solution and 0.38 x 10-9n12/s in t… more
Date: October 6, 1998
Creator: Forster, Fred K. & Galambos, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New Opportunities in Crystalline Silicon R&D

Description: To support the expected growth of the silicon solar cell industry, we believe that research and development (R&D) activities should be carried out in the following areas: polysilicon feedstock for the PV industry; thin-layer silicon deposition methods, and more environmentally benign cell and module manufacturing processes. For each of these activities, we identify the main issues that needed to be addressed.
Date: October 6, 1998
Creator: Tsuo, Y. S.; Wang, T. H.; Ciszek, T. F. (National Renewable Energy Laboratory) & Menna, P. (ENEA, Portici, Italy)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design, Fabrication, and Certification of Advanced Modular PV Power Systems Final Technical Progress Report

Description: This report describes the overall accomplishments and benefits of Solar Electric Specialties Co. (SES) under this Photovoltaic Manufacturing Technology (PVMaT) subcontract. SES addressed design issues related to their modular autonomous PV power supply (MAPPS) and a mobile photogenset. MAPPS investigations included gel-cell batteries mounted horizontally; redesign of the SES power supply; modified battery enclosure for increased safety and reduced cost; programmable, interactive battery charge … more
Date: October 6, 1998
Creator: Lambarski, T. & Minyard, G. (Solar Electric Specialties Co., Willits, California)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Closed ThUOX Fuel Cycle for LWRs with ADTT (ATW) Backend for the 21st Century

Description: A future nuclear energy scenario with a closed, thorium-uranium-oxide (ThUOX) fuel cycle and new light water reactors (TULWRs) supported by Accelerator Transmutation of Waste (ATW) systems could provide several improvements beyond today's once-through, UO{sub 2}-fueled nuclear technology. A deployment scenario with TULWRs plus ATWs to burn the actinides produced by these LWRs and to close the back-end of the ThUOX fuel cycle was modeled to satisfy a US demand that increases linearly from 80 GWe… more
Date: October 6, 1998
Creator: Beller, D. E.; Sailor, W. C. & Venneri, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New Materials for Future Generations of III-V Solar Cells

Description: Three- and four-junction III-V devices are proposed for ultrahigh-efficiency solar cells using a new 1-eV material lattice-matched to GaAs, namely, GaInNAs. We demonstrate working prototypes of a GaInNAs-based solar cell lattice-matched to GaAs with photoresponse down to 1 eV. Under the AM1.5 direct spectrum with all the light higher in energy than the GaAs band gap filtered out, the prototypes grown with base doping of about 10{sup 17} cm-3 have open-circuit voltages ranging from 0.35 to 0.44 … more
Date: October 6, 1998
Creator: Geisz, J. F.; Friedman, D. J.; Olson, J. M.; Kramer, C.; Kibbler, A. & Kurtz, S. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design Study of the Extraction System of the 3rd Generation ECR Ion Source

Description: A design study for the extraction system of the 3rd Generation super conducting ECR ion source at LBNL is presented. The magnetic design of the ion source has a mirror field of 4 T at the injection and 3 T at the extraction side and a radial field of 2.4 T at the plasma chamber wall. Therefore, the ion beam formation takes place in a strong axial magnetic field. Furthermore the axial field drops from 3 T to 0.4 T within the first 30 cm. The influence of the high magnetic field on the ion beam e… more
Date: October 6, 1998
Creator: Leitner, M. A.; Lyneis, C. M.; Taylor, C. E.; Wutte, D. & Xie, Z. Q.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Wet Chemical Oxidation of Organic Waste Using Nitric-Phosphoric Acid Technology

Description: Experimental progress has been made in a wide range of areas which support the continued development of the nitric-phosphoric acid oxidation process for combustible, solid organic wastes. An improved understanding of the overall process operation has been obtained, acid recovery and recycle systems have been studied, safety issues have been addressed, two potential final waste forms have been tested, preliminary mass flow diagrams have been prepared, and process flowsheets have been developed. … more
Date: October 6, 1998
Creator: Pierce, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wet Chemical Oxidation of Organic Waste Using Nitric-Phosphoric Acid Technology

Description: Experimental progress has been made in a wide range of areas which support the continued development of the nitric-phosphoric acid oxidation process for combustible, solid organic wastes. An improved understanding of the overall process operation has been obtained, acid recovery and recycle systems have been studied, safety issues have been addressed, two potential final waste forms have been tested, preliminary mass flow diagrams have been prepared, and process flowsheets have been developed. … more
Date: October 6, 1998
Creator: Pierce, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: City Hall Shooting]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story about a shooting that took place at the City Hall.
Date: October 6, 1998, 5:00 p.m.
Duration: 54 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
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