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Demonstration of LED Street Lighting in Kansas City, MO

Description: Nine different streetlighting products were installed on various streets in Kansas City, Missouri during February, 2011, to evaluate their performance relative to the incumbent high-pressure sodium (HPS) lighting. The applications investigated included 100 W, 150 W, 250 W, and 400 W HPS installations. Initial measurements and comparisons included power, illuminance, and luminance; sample illuminance readings have continued at each of the nine locations at roughly 1,000-hour operating intervals … more
Date: June 10, 2013
Creator: Kinzey, Bruce R.; Royer, Michael P.; Hadjian, M. & Kauffman, Rick
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New Fabrication Method Improves the Efficiency and Economics of Solar Cells (Fact Sheet)

Description: Synthetic fabrication strategy optimizes the illumination geometry and transport properties of dye-sensitized solar cells. Using oriented titanium oxide (TiO{sub 2}) nanotube (NT) arrays has shown promise for dye-sensitized solar cells (DSSCs). High solar conversion efficiency requires that the incident light enters the cell from the photoelectrode side. However, for NT-based DSSCs, the light normally enters the cell through the counter electrode because a nontransparent titanium foil is typica… more
Date: July 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Surface Characterization of the LCLS RF Gun Cathode

Description: The first copper cathode installed in the LCLS RF gun was used during LCLS commissioning for more than a year. However, after high charge operation (> 500 pC), the cathode showed a decline of quantum efficiency within the area of drive laser illumination. They report results of SEM, XPS and XAS studies that were carried out on this cathode after it was removed from the gun. X-ray absorption and X-ray photoelectron spectroscopy reveal surface contamination by various hydrocarbon compounds. In… more
Date: June 25, 2012
Creator: Brachmann, Axel; /SLAC; Decker, Franz-Josef; /SLAC; Ding, Yuantao; /SLAC et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Examination of 1D Solar Cell Model Limitations Using 3D SPICE Modeling: Preprint

Description: To examine the limitations of one-dimensional (1D) solar cell modeling, 3D SPICE-based modeling is used to examine in detail the validity of the 1D assumptions as a function of sheet resistance for a model cell. The internal voltages and current densities produced by this modeling give additional insight into the differences between the 1D and 3D models.
Date: June 1, 2012
Creator: McMahon, W. E.; Olson, J. M.; Geisz, J. F. & Friedman, D. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multi-Year SSL Market Development Support Plan

Description: This plan sets out a strategic, five year framework for guiding DOE's market development support activities for high-performance solid-state lighting (SSL) products for the U.S. general illumination market. The market development support activities described in this plan, which span federal fiscal years 2012 to 2016, are intended to affect the types of SSL general illumination products adopted by the market, to accelerate commercial adoption of those products, and to support appropriate applica… more
Date: May 1, 2012
Creator: Ledbetter, Marc R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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PHOTOINDUCED CURRENTS IN CDZNTE CRYSTALS AS A FUNCTION OF ILLUMINATION WAVELENGTH

Description: We report variations in the currents of CdZnTe semiconductor crystals during exposure to a series of light emitting diodes of various wavelengths ranging from 470 to 950 nm. The changes in the steady-state current of one CdZnTe crystal with and without illumination along with the time dependence of the illumination effects are discussed. Analysis of the de-trapping and transient bulk currents during and after optical excitation yield insight into the behaviour of charge traps within the crystal… more
Date: April 23, 2012
Creator: Teague, L.; Washington, A. & Duff, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Final Report for PV Incubator Subcontract No. NEU-0-99010-09: March 29, 2010 - March 28, 2011

Description: MicroLink has developed a process technology that will enable the manufacture of high-efficiency, low-cost, multijunction solar cells for use in concentrating photovoltaic (CPV) applications. The multijunction cells were fabricated using a novel low-temperature wafer bonding process. A triple-junction InGaP/GaAs/Ge tandem solar cell with efficiency of 30% at 1 sun AM1.5 illumination was fabricated by wafer bonding a dual-junction InGaP/GaAs cell to a single-junction Ge cell. Temperature cycling… more
Date: April 1, 2012
Creator: Pan, N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Max Tech and Beyond: High-Intensity Discharge Lamps

Description: High-intensity discharge (HID) lamps are most often found in industrial and commercial applications, and are the light source of choice in street and area lighting, and sports stadium illumination. HID lamps are produced in three types - mercury vapor (MV), high pressure sodium (HPS) and metal halide (MH). Of these, MV and MH are considered white-light sources (although the MV exhibits poor color rendering) and HPS produces a yellow-orange color light. A fourth lamp, low-pressure sodium (LPS), … more
Date: April 1, 2012
Creator: Scholand, Michael
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Strategy Guideline: High Performance Residential Lighting

Description: The Strategy Guideline: High Performance Residential Lighting has been developed to provide a tool for the understanding and application of high performance lighting in the home. The high performance lighting strategies featured in this guide are drawn from recent advances in commercial lighting for application to typical spaces found in residential buildings. This guide offers strategies to greatly reduce lighting energy use through the application of high quality fluorescent and light emittin… more
Date: February 1, 2012
Creator: Holton, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Extremely high frequency RF effects on electronics.

Description: The objective of this work was to understand the fundamental physics of extremely high frequency RF effects on electronics. To accomplish this objective, we produced models, conducted simulations, and performed measurements to identify the mechanisms of effects as frequency increases into the millimeter-wave regime. Our purpose was to answer the questions, 'What are the tradeoffs between coupling, transmission losses, and device responses as frequency increases?', and, 'How high in frequency do… more
Date: January 1, 2012
Creator: Loubriel, Guillermo Manuel; Vigliano, David; Coleman, Phillip Dale; Williams, Jeffery Thomas; Wouters, Gregg A.; Bacon, Larry Donald et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NREL Measures IMM Solar Cell Performance for CPV (Fact Sheet), NREL Highlights, Science

Description: New measurement capability supports the development of high-efficiency solar cells for concentrating photovoltaic (CPV) application. NREL scientists recently completed a set of measurements on the performance of an inverted metamorphic multijunction (IMM) solar cell as a function of concentration and cell operating temperature. The triple-junction cell had subcell bandgaps of 1.81, 1.40, and 1.00. Much of the work focused on developing and validating the measurement techniques (i.e., the spectr… more
Date: September 1, 2011
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Precision X-Band Linac Technologies for Nuclear Photonics Gamma-Ray Sources

Description: Nuclear photonics is an emerging field of research requiring new tools, including high spectral brightness, tunable gamma-ray sources; high photon energy, ultrahigh-resolution crystal spectrometers; and novel detectors. This presentation focuses on the precision linac technology required for Compton scattering gamma-ray light sources, and on the optimization of the laser and electron beam pulse format to achieve unprecedented spectral brightness. Within this context, high-gradient X-band techno… more
Date: August 31, 2011
Creator: Hartemann, F. V.; Albert, F.; Anderson, S. G.; Bayramian, A. J.; Cross, R. R.; Ebbers, C. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ONE-DIMENSIONAL PLASMONIC NANO-PHOTOCATALYSTS: SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY

Description: This study describes a simple two-step approach to coat gold nanorods with a silica/titania shell. Gold nanorods with an aspect ratio of 2.5 (L = 48 {+-} 2 and d = 19 {+-} 1) are synthesized by a silver-seed mediated growth approach according to our previously reported procedure (Hunyadi Murph ACS Symposium Series, Volume 1064, Chapter 8, 2011, 127-163 and reference herein). Gold nanorods are grown on pre-formed gold nano-seeds in the presence of surfactant, cetyltrimethylammonium bromide (CTAB… more
Date: August 14, 2011
Creator: Murph, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ILLUMINATION RESPONSE OF CDZNTE

Description: CdZnTe (CZT) semiconducting crystals are of interest for use as room temperature X- and {gamma}-ray spectrometers. Several studies have focused on understanding the various electronic properties of these materials, such as the surface and bulk resistivities and the distribution of the electric field within the crystal. Specifically of interest is how these properties are influenced by a variety of factors including structural heterogeneities, such as secondary phases (SPs) and line defects as w… more
Date: August 2, 2011
Creator: Teague, L.; Washington, A. & Duff, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Centroid and Envelope Eynamics of Charged Particle Beams in an Oscillating Wobbler and External Focusing Lattice for Heavy Ion Fusion Applications

Description: Recent heavy ion fusion target studies show that it is possible to achieve ignition with direct drive and energy gain larger than 100 at 1MJ. To realize these advanced, high-gain schemes based on direct drive, it is necessary to develop a reliable beam smoothing technique to mitigate instabilities and facilitate uniform deposition on the target. The dynamics of the beam centroid can be explored as a possible beam smoothing technique to achieve a uniform illumination over a suitably chosen regio… more
Date: July 19, 2011
Creator: Logan, Ronald C. Davidson and B. Grant
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Calibration of LSST Instrumental and Atmospheric Photometric Passbands

Description: The Large Synoptic Survey Telescope (LSST) will continuously image the entire sky visible from Cerro Pachon in northern Chile every 3-4 nights throughout the year. The LSST will provide data for a broad range of science investigations that require better than 1% photometric precision across the sky (repeatability and uniformity) and a similar accuracy of measured broadband color. The fast and persistent cadence of the LSST survey will significantly improve the temporal sampling rate with which … more
Date: July 6, 2011
Creator: Burke, David L.; Axelrod, T.; Barrau, Aurelien; Baumont, Sylvain; Blondin, Stephane; Claver, Chuck et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Overcoming Degradation in Organic Photovoltaics: Illuminating the Role of Fullerene Functionalization: Preprint

Description: Photobleaching rates are investigated for thin films of poly(3-hexylthiophene) (P3HT) blends employing either an indene-C60 bisadduct (ICBA) or [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the electron acceptor. Relative to the bisindene, PCBM significantly enhances resistance to photobleaching of the P3HT donor polymer. We tentatively attribute a decrease in the charge transfer rate as the mechanism responsible for the more rapid photobleaching in the sample containing the bisindene ad… more
Date: July 1, 2011
Creator: Lloyd, M. T.; Garcia, A.; Berry, J. J.; Reese, M. O.; Ginley, D. S. & Olson, D. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Baker-Barry Tunnel Lighting: Evaluation of a Potential GATEWAY Demonstrations Project

Description: The U.S. Department of Energy is evaluating the Baker-Barry Tunnel as a potential GATEWAY Demonstrations project for deployment of solid-state lighting (SSL) technology. The National Park Service views this project as a possible proving ground and template for implementation of light-emitting diode (LED) luminaires in other tunnels, thereby expanding the estimated 40% energy savings from 132 MWh/yr to a much larger figure nationally. Most of the energy savings in this application is attributabl… more
Date: June 28, 2011
Creator: Tuenge, Jason R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Demonstration Assessment of Light-Emitting Diode (LED) Parking Lot Lighting in Leavenworth, KS

Description: This report describes the process and results of a demonstration of solid-state lighting (SSL) technology in a commercial parking lot lighting application, under the U.S. Department of Energy (DOE) Solid-State Lighting Technology GATEWAY Demonstration Program. The parking lot is for customers and employees of a Walmart Supercenter in Leavenworth, Kansas and this installation represents the first use of the LED Parking Lot Performance Specification developed by the DOE’s Commercial Building Ener… more
Date: May 6, 2011
Creator: Myer, Michael; Kinzey, Bruce R. & Curry, Ku'uipo
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimization of Solar Cell Design for Use with GreenVolts CPV System: Cooperative Research and Development Final Report, CRADA Number CRD-08-00281

Description: GreenVolts, a Bay area start-up, was developing a CPV system that was based on a unique reflective optical design. They were interested in adapting the inverted GaInP/GaAs/GaInAs cell structure designed at NREL for use in their system. The purpose of this project was to optimize the inverted GaInP/GaAs/GaInAs cell for operation in the GreenVolts optical system.
Date: May 1, 2011
Creator: Ward, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Commentary on A Conceptual Design of Transport Lines for a Heavy-Ion Inertial-Fusion Power Plant

Description: Some major system features are not stated but can be inferred. For example this is probably an engineering test facility, not a power plant driver, because the standoff from target to final magnet is only 5.0 m. The fusion target takes two-sided illumination with indirect drive using a total of 60 beam pulses: 10 pre-pulses (3.0 GeV) + 20 main pulses (4.0 GeV) from each side. On page 12 it's stated that the charge per beam pulse is 26.8 {micro}C, so we calculate pre-pulse: 20 x 3 GeV x 26.8 {mi… more
Date: April 13, 2011
Creator: Lee, Edward P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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