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Fresh Fuel Characterization of U-Mo Alloys

Description: The need to provide more accurate property information on U-Mo fuel alloys to reactor operators, modelers, researchers, fabricators, and regulators increases as success of the RERTR program continues. This presentation will provide an overview of fresh fuel U-Mo characterization activities on monolithic fuel occurring at the Idaho National Laboratory. The overview will particularly be focused on properties available through current and previous research, and also on the type of information stil… more
Date: October 1, 2008
Creator: Burkes, D. E.; Wachs, D. M.; Keiser, D. D.; Gan, J.; Rice, F. J.; Prabhakaran, R. et al.
Partner: UNT Libraries Government Documents Department
open access

Comparison of Aromatic Dithiophoshinic and Phosphinic Acid Derivatives for Minor Actinide Extraction

Description: A new extractant for the separation of actinide(III) and lanthanide(III), bis(otrifluoromethylphenyl) phosphinic acid (O-PA) was synthesized. The synthetic route employed mirrors one that was employed to produce the sulfur containing analog bis(otrifluoromethylphenyl) dithiophosphinic acid (S-PA). Multinuclear NMR spectroscopy was used for elementary characterization of the new O-PA derivative. This new O-PA extractant was used to perform Am(III)/Eu(III) separations and the results were directl… more
Date: March 1, 2008
Creator: Klaehn, John R.; Peterman, Dean R.; Harrup, Mason K.; Tillotson, Richard D.; Greenhalgh, Mitchell R.; Luther, Thomas A. et al.
Partner: UNT Libraries Government Documents Department
open access

Measurement and Modeling of Solar and PV Output Variability: Preprint

Description: This paper seeks to understand what temporal and spatial scales of variability in global horizontal radiation are important to a PV plants and what measurements are needed to be able to characterize them. As solar radiation measuring instruments are point receivers it is important to understand how those measurements translate to energy received over a larger spatial extent. Also of importance is the temporal natural of variability over large spatial areas. In this research we use high temporal… more
Date: April 1, 2011
Creator: Sengupta, M.
Partner: UNT Libraries Government Documents Department
open access

Radiological Characterization Methodology of INEEL Stored RH-TRU Waste from ANL-E

Description: An Acceptable Knowledge (AK)-based radiological characterization methodology is being developed for RH TRU waste generated from ANL-E hot cell operations performed on fuel elements irradiated in the EBR-II reactor. The methodology relies on AK for composition of the fresh fuel elements, their irradiation history, and the waste generation and collection processes. Radiological characterization of the waste involves the estimates of the quantities of significant fission products and transuranic i… more
Date: February 1, 2003
Creator: Bhatt, Rajiv N.
Partner: UNT Libraries Government Documents Department
open access

Development of an Equivalent Wind Plant Power-Curve: Preprint

Description: Development of an equivalent wind plant power-curve becomes highly desirable and useful in predicting plant output for a given wind forecast. Such a development is described and summarized in this paper.
Date: June 1, 2010
Creator: Wan, Y. H.; Ela, E. & Orwig, K.
Partner: UNT Libraries Government Documents Department
open access

Characterization of Photovoltaic Concentrators

Description: This paper will describe the resources at the National Renewable Energy Laboratory (NREL) for performing characterization of photovoltaic (PV) materials designed for operation under concentrated light. NREL has the capability to measure devices ranging from very small, unencapsulated research cells to reasonably sized, environmentally protected modules. Data gathering and interpretation are also ongoing areas of revision and improvement. The main goal of the current research is to reduce the me… more
Date: January 1, 2005
Creator: Kiehl, J. & Emery, E.
Partner: UNT Libraries Government Documents Department
open access

Nondestructive Characterization of Atomic Density Profile in CdS/Zn2SnO4 Junctions by X-Ray Fluorescence: Preprint

Description: Presented at the 2001 NCPV Program Review Meeting: Atomic density profile of selected atomic species in a series of CdS/Zn{sub 2}SnO{sub 4} junctions has been investigated by using the method of Angular Dependence of X-ray Fluorescence (ADXRF). Samples of CdS, Zn{sub 2}SnO{sub 4} (ZTO), and CdS/ZTO junctions were grown on glass, followed by different annealing processes. Special attention is directed to a comparison of samples heat-treated in argon and in CdCl{sub 2} at different temperatures. … more
Date: October 1, 2001
Creator: Kim, S.; Soo, Y. L.; Kioseoglou, G.; Kao, Y. H. & Wu, X.
Partner: UNT Libraries Government Documents Department
open access

In-Situ Studies of the Growth of Amorphous and Microcrystalline Silicon Using Real-Time Spectroscopic Ellipsometry

Description: Real-time, in-situ characterization of hot-wire chemical vapor deposition (HWCVD) growth of hydrogenated silicon (Si:H) thin films offers unique insight into the properties of the materials and mechanisms of their growth. We have used in-situ spectroscopic ellipsometry to characterize Si:H crystallinity as a function of film thickness and deposition conditions. We find that the transition from amorphous to microcrystalline growth is a strong function of film thickness and hydrogen dilution, and… more
Date: May 1, 2003
Creator: Levi, D.; Nelson, B. & Perkins, J.
Partner: UNT Libraries Government Documents Department
open access

Nondestructive Performance Characterization Techniques for Module Reliability

Description: This paper describes nondestructive characterization techniques for module reliability. These techniques include light and dark current versus voltage and related analysis such as resistance, diode quality factor, and dark current. The use of the NREL laser scanner at zero volts and forward bias is also described as a technique to uncover cracks, shunts, and open-circuit regions in a module. Quantum-efficiency measurements of isolated cells or regions in a module are also possible. The interpre… more
Date: May 1, 2003
Creator: Emery, K.
Partner: UNT Libraries Government Documents Department
open access

Defects in GaInNAs: What We've Learned So Far

Description: We show results from a number of experimental and theoretical investigations on GaInNAs in an attempt to provide a more complete picture of defects in this material than is currently available. Much has been learned in recent years, including the effects of impurities such as hydrogen and carbon, the behavior of GaInNAs on annealing, and the defects that cause a degradation of material properties, including photoluminescence intensity and, especially important for solar cells, minority-carrier … more
Date: May 1, 2003
Creator: Ptak, A. J.; Kurtz, S.; Johnston, S. W.; Friedman, D. J.; Geisz, J. F.; Olson, J. M. et al.
Partner: UNT Libraries Government Documents Department
open access

Determination of Spatial Uniformity by Ion Imaging with Secondary Ion Mass Spectrometry (SIMS)

Description: This paper discusses some of the problems associated with applying secondary ion mass spectrometry (SIMS) to non uniform solar cell materials from the characterization viewpoint. Two examples are given: depth profile analysis of contacts on III-V materials, and bulk analysis of processed silicon materials.
Date: May 1, 2003
Creator: Reedy, R. & Ptak, A.
Partner: UNT Libraries Government Documents Department
open access

Silicon float-zone crystal growth as a tool for the study of defects and impurities

Description: Because of its ability to produce silicon crystals of exceptionally high purity and crystallographic perfection, the float-zone method lends itself to use as a tool for the controlled study of deliberately introduced defects and impurities in Si crystals and their effects on materials properties such as minority charge-carrier lifetime or photovoltaic conversion efficiency. Some examples of such studies are presented here. Defects the authors have studied include grain size, dislocations, swirl… more
Date: June 20, 2000
Creator: Ciszek, T. F. & Wang, T. H.
Partner: UNT Libraries Government Documents Department
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