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351 Matching Results
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Development and Characterization of a High Performance Thin-Film Planar Solid-Oxide Fuel Cell Stack
A planar solid oxide fuel cell (SOFC) was fabricated using a tape-cast Ni/yttria-stabilized zirconia (YSZ) anode support, a YSZ thin film electrolyte, and a composite cathode of YSZ and (La{sub 0.85}Sr{sup 0.14}){sub 0.98}MnO{sub 3} (LSM). Using pure hydrogen as the fuel gas, a three cell stack with a cross-flow design and external manifolds produced peak power densities of 0.85 W/cm{sup 2} and 0.41 W/cm{sup 2} at 800 C and 700 C, respectively. Using wet methane as the fuel gas, the stack produced a peak power density of 0.22 W/cm{sup 2} at 700 C. Individual cells in the stack showed identical current-voltage (I -V) characteristics. Stack lifetime was limited because of degradation of the cells from oxidation products coming from the metallic interconnect used.
Date:
April 7, 2004
Creator:
Chung, Brandon W.; Chervin, Christopher N; Haslam, Jeffrey J.; Pham, Ai-Quoc & Glass, Robert S.
Object Type:
Article
System:
The UNT Digital Library
The Subsurface Flow and Transport Experimental Laboratory: A New Department of Energy Users Facility for Intermediate-Scale Experimentation.
Intermediate-scale experiments (ISEs) for flow and transport are a valuable tool for simulating subsurface features and conditions encountered in the field at government and private sites. ISEs offer the ability to study, under controlled laboratory conditions, complicated processes characteristic of mixed wastes and heterogeneous subsurface environments, in multiple dimensions and at different scales. ISEs may, therefore, result in major cost savings if employed prior to field studies. A distinct advantage of ISEs is that researchers can design physical and/or chemical heterogeneities in the porous media matrix that better approximate natural field conditions and therefore address research questions that contain the additional complexity of processes often encountered in the natural environment. A new Subsurface Flow and Transport Experimental Laboratory (SFTEL) has been developed for ISE users in the Environmental Molecular Sciences Laboratory (EMSL) at Pacific Northwest National Laboratory (PNNL). The SFTEL offers a variety of columns and flow cells, a new state-of-the-art dual-energy gamma system, a fully automated saturation-pressure apparatus, and analytical equipment for sample processing. The new facility, including qualified staff, is available for scientists interested in collaboration on conducting high-quality flow and transport experiments, including contaminant remediation. Close linkages exist between the SFTEL and numerical modelers to aid in …
Date:
April 7, 2004
Creator:
Oostrom, Mart; Wietsma, Thomas W.; Foster, Nancy S. & Ramirez, J. A.
Object Type:
Article
System:
The UNT Digital Library
Biorefinery Concept Development Based On Wheat Flour Milling
A new process is being developed to extract starch from millfeed, the low-value byproduct of wheat flour milling, and convert it to glucose through enzymatic processing. The millfeed-derived glucose will then be converted to value-added products, such as polyol, through a catalytic process, or lactic acid, through a fermentation process. The starch (glucose) recovery process has been tested through the pilot scale. Catalytic and fermentation processes have been tested in the laboratory. The process developed for glucose recovery from wheat millfeed includes hot water extraction of starch and filtration of a fibrous animal feed coproduct, followed by enzymatic liquefaction and saccharification of the extracted starch, with filtration of a high-protein coproduct. The bench-scale tests showed that a glucose yield of approximately 30% on a dry millfeed basis could be achieved, which corresponds to the recovery of essentially all the glucose value in the millfeed. Glucose yields with the pilot-scale system were comparable, although filtration was more difficult.
Date:
April 7, 2002
Creator:
Elliott, Douglas C.; Orth, Rick J.; Gao, Johnway; Werpy, Todd A.; Eakin, David E.; Schmidt, Andrew J. et al.
Object Type:
Article
System:
The UNT Digital Library
Flash X-Ray (FXR) Accelerator Optimization - Beam-induced Voltage Simulation and TDR Measurements
Lawrence Livermore National Laboratory (LLNL) is evaluating design alternatives to improve the voltage regulation in our Flash X-Ray (FXR) accelerator cell and pulse-power system. The goal is to create a more mono-energetic electron beam that will create an x-ray source with a smaller spot-size. Studying the interaction of the beam and accelerator cell will generate improved designs for high-current accelerators at Livermore and elsewhere. When an electron beam crosses the energized gap of an accelerator cell, the electron energy is increased. However, the beam with the associated electromagnetic wave also looses a small amount of energy because of the increased impedance seen across the gap. The phenomenon is sometimes called beam loading. It can also be described as a beam-induced voltage at the gap which is time varying. This creates beam energy variations that we need to understand and control. A high-fidelity computer simulation of the beam and cell interaction has been completed to quantify the time varying induced voltage at the gap. The cell and pulse-power system was characterized using a Time-domain Reflectometry (TDR) measurement technique with a coaxial air-line to drive the cell gap. The beam-induced cell voltage is computed by convoluting the cell impedance with measured beam …
Date:
April 7, 2004
Creator:
Ong, M. M. & Vogtlin, G. E.
Object Type:
Report
System:
The UNT Digital Library
Iron Phosphate Glass as an Alternative Waste-Form for Hanford LAW
Although the current baseline Hanford flowsheet for immobilizing low-activity waste (LAW) assumes borosilicate-based glass, opportunities exist to improve or change this baseline to reduce the current schedule and cost requirements of accomplishing the mission of site cleanup. Development of an alternative glass-forming system can lead to this goal of cost and schedule reduction through enhanced waste loading and higher plant throughput. The purpose of this project is to investigate the iron-phosphate glass system as an alternative for immobilizing Hanford LAW. Previous studies on the iron phosphate glass systems and their potential advantages for immobilizing Hanford LAW have been reviewed and technical uncertainties and data required before implementing this technology have been presented. A team of researchers and engineers from the MO-SCI Corporation, the Pacific Northwest National Laboratory, the Savannah River Technology Center, and the University of Missouri at Rolla has performed a series of tests to address some of the open questions about the potential use of iron phosphate glass for immobilizing Hanford LAW. The results of this team effort are summarized along with recommendations regarding the further laboratory study needs. Additional longer-term testing requirements for implementing the iron phosphate glass-based immobilization process at Hanford are also presented.
Date:
April 7, 2003
Creator:
Kim, Dong-Sang (BATTELLE (PACIFIC NW LAB)); Buchmiller, William C. (BATTELLE (PACIFIC NW LAB)); Schweiger, Michael J. (BATTELLE (PACIFIC NW LAB)); Vienna, John D. (BATTELLE (PACIFIC NW LAB)); Day, D E.; Kim, C W. (Missouri, Univ Of - Rolla (For) et al.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Donald Skipworth to Donna Davis, Alan Levi, Joel Lazarine, and Andres Pereira, April 7, 2000]
Letter from Donald Skipworth to Donna Davis, Alan Levi, Joel Lazarine, and Andres Pereira discussing the writing of a check and other business.
Date:
April 7, 2000
Creator:
Skipworth, Donald
Object Type:
Letter
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 59, No. 14, Ed. 1 Thursday, April 7, 2005
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2005
Creator:
Tracy, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 132, Ed. 1 Saturday, April 7, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 137, Ed. 1 Friday, April 7, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Ingleside Index (Ingleside, Tex.), Vol. 55, No. 12, Ed. 1 Thursday, April 7, 2005
Weekly newspaper from Ingleside, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Area Codes]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 7, 2000, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 1, Ed. 1 Wednesday, April 7, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 14, Ed. 1 Thursday, April 7, 2005
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2005
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County Advocate (Holliday, Tex.), Vol. 3, No. 1, Ed. 1 Thursday, April 7, 2005
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2005
Creator:
Thomas, John & McCall, Jody
Object Type:
Newspaper
System:
The Portal to Texas History
Solid Solution Phases in the Olivine-Type LiMnPO4/MnPO4 System
Nonstoichiometry is reported in the LiMnPO{sub 4}/MnPO{sub 4} system for the first time. As lithium is removed from crystalline LiMnPO{sub 4} by chemical or electrochemical methods, the resulting two phase mixture consists of stoichiometric LiMnPO{sub 4} and a delithiated phase, Li{sub y}MnPO{sub 4}, whose lattice parameters depend upon the global extent of delithiation and on the crystalline domain size of the delithiated phase. This behavior is reproduced during electrochemical insertion of lithium. Again, no evidence for nonstoichiometry was found in the vicinity of LiMnPO{sub 4}. Attempts to create single phase solid solutions by heating mixtures of the two phases failed due to the thermal instability of Li{sub y}MnPO{sub 4}.
Date:
April 7, 2009
Creator:
Chen, Guoying & Richardson, Thomas J.
Object Type:
Article
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 41, No. 7, Ed. 1 Friday, April 7, 2006
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
April 7, 2006
Creator:
Goldapp, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
[Handwritten Memo]
A handwritten memo including a message: "Will get 6 checks/page front and back. Effective May 31, 2003." Backside of the memo is an announcement from the Dallas National Bank regarding the arrival of image statements.
Date:
April 7, 2003
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Amendments to Article VII]
Email with proposed amendments to article VII.
Date:
April 7, 2009
Creator:
Graney, Daniel
Object Type:
Text
System:
The UNT Digital Library
[Letter to Board Members Concerning Bylaws]
Email to the board members that contains bylaw revisions for the Texas Stonewall Democratic Caucus.
Date:
April 7, 2007
Creator:
Daniels, Al
Object Type:
Letter
System:
The UNT Digital Library
[Letter to Board Members Concerning Bylaws]
Letter to members of the board regarding proposed bylaw amendments to the Texas Stonewall Democratic Caucus.
Date:
April 7, 2007
Creator:
Texas Stonewall Democratic Caucus
Object Type:
Letter
System:
The UNT Digital Library
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 50, Ed. 1 Sunday, April 7, 2002
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 7, 2002
Creator:
Brisendine, Lynn & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 51, Ed. 1 Wednesday, April 7, 2004
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 7, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 123, No. 28, Ed. 1 Thursday, April 7, 2005
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
April 7, 2005
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 119, No. 14, Ed. 1 Thursday, April 7, 2005
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 7, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History