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4,170 Matching Results
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A 3-D Model of Signaling and Transport Pathways in Epithelial Cells
A 3-dimensional computer model was developed to simulate the spatial and chemical evolution of calcium ions inside an array of human epithelial kidney cells. This is a prototype model, intended to develop a methodology to incorporate much more complex interactions of metabolic and other processes within many types of cells and lead to increased ability to predict cellular responses to disease as well as to chemical and biological warfare situations. Preliminary tests of the model are described.
Date:
April 1, 2005
Creator:
Quong, Andrew A. & Westbrook, Charles K.
Object Type:
Report
System:
The UNT Digital Library
3-D Seismic Experimentation and Advanced Processing/Inversion Development for Investigations of the Shallow Subsurface
Gian Fradelizio, a Rice Ph.D. student has completed reprocessing the 3D seismic reflection data acquired at Hill AFB through post-stack depth migration for comparison to the traveltime and waveform tomography results. Zelt, Levander, Fradelizio, and 5 others spent a week at Hill AFB in September 2005, acquiring an elastic wave data set along 2 profiles. We used 60 3-component Galperin mounted 40 Hz geophones recorded by 3 GEOMETRICS Stratavision systems. The seismic source employed was a sledgehammer used to generate transverse, and radial, and vertical point source data. Data processing has begun at Rice to generate S-wave reflection and refraction images. We also acquired surface wave and ground penetrating rada data to complement the elastic wave dataset.
Date:
June 1, 2005
Creator:
Levander, Alan R.
Object Type:
Report
System:
The UNT Digital Library
3-Nitropropionic Acid is a Suicide Inhibitor of MitochondrialRespiration that, Upon Oxidation by Complex II, Forms a Covalent AdductWith a Catalytic Base Arginine in the Active Site of the Enzyme
We report three new structures of mitochondrial respiratory Complex II (succinate ubiquinone oxidoreductase, E.C. 1.3.5.1) at up to 2.1 {angstrom} resolution, with various inhibitors. The structures define the conformation of the bound inhibitors and suggest the residues involved in substrate binding and catalysis at the dicarboxylate site. In particular they support the role of Arg297 as a general base catalyst accepting a proton in the dehydrogenation of succinate. The dicarboxylate ligand in oxaloacetate-containing crystals appears to be the same as that reported for Shewanella flavocytochrome c treated with fumarate. The plant and fungal toxin 3-nitropropionic acid, an irreversible inactivator of succinate dehydrogenase, forms a covalent adduct with the side chain of Arg297. The modification eliminates a trypsin cleavage site in the flavoprotein, and tandem mass spectroscopic analysis of the new fragment shows the mass of Arg 297 to be increased by 83 Da and to have potential of losing 44 Da, consistent with decarboxylation, during fragmentation.
Date:
December 1, 2005
Creator:
Huang, Li-shar; Sun, Gang; Cobessi, David; Wang, Andy C.; Shen,John T.; Tung, Eric Y. et al.
Object Type:
Article
System:
The UNT Digital Library
04/28/05 Cobra Data: JSF Recommendation
103-06A-NMC19 - DoD Input - Navy/MC - Naval Air Station Pensacola - Florida - BRAC Commission - FY 2005.
Date:
September 1, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
04/28/2005 COBRA Report: JSF Initial Test Site
DoD Input - 103-06 - General - Joint Strike Fighter Data - Cobra Report - BRAC Commission - FY 2005.
Date:
September 1, 2005
Creator:
United States. Department of Defense.
Object Type:
Book
System:
The UNT Digital Library
4-D High-Resolution Seismic Reflection Monitoring of Miscible CO2 Injected into a Carbonate Reservoir
The objective of this research project is to acquire, process, and interpret multiple high-resolution 3-D compressional wave and 2-D, 2-C shear wave seismic data to observe changes in fluid characteristics in an oil field before, during, and after the miscible carbon dioxide (CO{sub 2}) flood that began around December 1, 2003, as part of the DOE-sponsored Class Revisit Project (DOE DE-AC26-00BC15124). Unique and key to this imaging activity is the high-resolution nature of the seismic data, minimal deployment design, and the temporal sampling throughout the flood. The 900-m-deep test reservoir is located in central Kansas oomoldic limestones of the Lansing-Kansas City Group, deposited on a shallow marine shelf in Pennsylvanian time. After 18 months of seismic monitoring, one baseline and six monitor surveys clearly imaged changes that appear consistent with movement of CO{sub 2} as modeled with fluid simulators.
Date:
September 1, 2005
Creator:
Miller, Richard D.; Raef, Abdelmoneam E.; Byrnes, Alan P. & Harrison, William E.
Object Type:
Report
System:
The UNT Digital Library
8 GeV H- ions: Transport and injection
Fermilab is working on the design of an 8 GeV superconducting RF H{sup -} linac called the Proton Driver. The energy of H{sup -} beam will be an order of magnitude higher than the existing ones. This brings up a number of technical challenges to transport and injection of H{sup -} ions. This paper will focus on the subjects of stripping losses (including stripping by blackbody radiation, field and residual gas) and carbon foil stripping efficiency, along with a brief discussion on other issues such as Stark states lifetime of hydrogen atoms, single and multiple Coulomb scattering, foil heating and stress, radiation activation, collimation and jitter correction, etc.
Date:
May 1, 2005
Creator:
Chou, W.; Bryant, H.; Drozhdin, A.; Hill, C.; Kostin, M.; Macek, R. et al.
Object Type:
Article
System:
The UNT Digital Library
17.5% p-Type Silicon Heterojunction Solar Cells with HWCVD a-Si:H as the Emitter and Back Contact
Thin hydrogenated amorphous silicon (a-Si:H) layers deposited by hot-wire chemical vapor deposition (HWCVD) are used as both emitters and back contacts in silicon heterojunction solar cells. Low interface recombination velocity and high open-circuit voltage are achieved by a low substrate temperature (<150 deg C) intrinsic a-Si:H deposition which ensures immediate amorphous silicon deposition. This is followed by deposition of doped a-Si:H at a higher temperature (>200 deg C) which appears to improve dopant activation. With an i/n a-Si:H emitter, we obtain a confirmed efficiency of 17.1% on textured p-type float-zone (FZ) silicon with a screen-printed aluminum back-surface-field (Al-BSF) contact. Employing a-Si:H as both the front emitter and the back contact, we achieve a confirmed efficiency of 17.5%, the highest reported efficiency for a p-type c-Si based heterojunction solar cell.
Date:
November 1, 2005
Creator:
Wang, T. H.; Page, M. R.; Iwaniczko, E.; Wang, Q.; Xu,Y.; Yan, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
21-kW Thin-Film PV Technology Validation -- An NREL/Solar Energy Centre of India MOU Cooperative Project
This paper summarizes findings during a one-week (27-31 October 2003) site visit to the Thin-Film Technology Test Bed at India's Solar Energy Centre (SEC) near New Delhi. The U.S. and Indian governments signed a Memorandum of Understanding in March 2000 to undertake a 50-50 cost-shared 21-kW thin-film PV technology validation project to evaluate the performance of thin-film photovoltaic (PV) modules under Indian climatic conditions. This project benefits Indian researchers by giving them experience with cost-effective PV materials, and it benefits the United States because data will be sent to the appropriate U.S. thin-film PV manufacturers for evaluation and analysis. During the visit, NREL personnel engaged in technical discussions regarding thin-film PV technologies with Ministry of Non-Conventional Energy Sources engineers and scientists. Issues included inspecting the newly constructed arrays, discussing better methods of electrically loading the PV arrays, taking I-V traces, and gathering baseline I-V data.
Date:
January 1, 2005
Creator:
McNutt, P. F. & Ullal, H. S.
Object Type:
Article
System:
The UNT Digital Library
53 MHz beam loading compensation for slip stacking in the Fermilab Main Injector
Recently In-Phase and Quadrature (I&Q) was added to both the 53 MHz Feedback and Feedforward Beam Loading Compensation for Slip Stacking in the Fermilab Main Injector. With 53 MHz Feedback, we can now turn the 18 Radio Frequency (RF) Stations off down to below 100 V. In using I&Q on Feedforward, beam loading compensation to the beam on both the upper and lower frequencies of Slip Stacking can be applied as we slip the beam. I&Q theory will be discussed.
Date:
May 1, 2005
Creator:
Dey, J. & Kourbanis, I.
Object Type:
Article
System:
The UNT Digital Library
71 Letters to the Commission from residents in support of Cannon AFB
Community Correspondence – 71 Letters to the Commission from residents in support of Cannon AFB
Date:
July 1, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
The 100,000 amp dc power supply for a staged hadron collider super ferric magnet
A 1.5 volt 100,000 amp DC switcher power supply was developed for testing a superferric magnet string at FNAL. This supply was used during testing as both the ramping supply and holding supply powering a single magnet load with a total load resistance of 0.7{micro} Ohms. The supply consists of ten paralleled switcher cells, powered by a 400 volt/600 Amp DC power supply. Each cell consists of an IGBT H-bridge driving a step-down transformer at a switching frequency of 2 kHz. The transformer has an effective turns ratio of 224:1. The secondary consists of 32 parallel single-turn full wave rectifier windings. The rectification is done with 64 Shottky diodes. Each cell is rated at 1.5 volts/10,000 amps. During this test each cell was operated as a constant power source without load current or field feedback. This paper will describe the design of the switcher cell and control system used during testing. We will also describe the next level of improvements to the current feedback system to improve the ramp control.
Date:
September 1, 2005
Creator:
Hays, Steven L.; Claypool, Bradley & Foster, G. William
Object Type:
Article
System:
The UNT Digital Library
100/300 Area Aquifer Tube Task: Annual Sampling for Fiscal Year 2006, Hanford Site, Washington
This letter report has been prepared to provide the U.S. Department of Energy, U.S. Environmental Protection Agency, Washington State Department of Ecology, and Hanford Site contractors with logistical information pertaining to the use of certain environmental monitoring sites. Although the distribution is not limited, It is not intended for general distribution beyond that audience.
Date:
November 1, 2005
Creator:
Peterson, Robert E.; Hartman, Mary J.; Raidl, Robert F. & Borghese, Jane V.
Object Type:
Report
System:
The UNT Digital Library
The 100 kA current leads for a superconducting transmission line magnet
A pair of current leads to power a transmission line magnet cooled at liquid helium temperature has been designed and developed at Fermilab. The leads designed to carry 100 kA dc current. Each lead consists of a warm end, heat exchange section and a cold end. The warm end is a half moon plate and cylinder brazed together. The heat exchange section is made of 202 copper rods arranged in a staggered pattern. Each rod is 6.35 mm in diameter and 1650 mm in length. The rods were soft-soldered into 12.7 mm deep holes at both warm and cold ends. The helium gas flow, guided by anodized aluminum baffles along the lead length, allows for a relatively high heat transfer coefficient between the current carrying rods and cooling helium gas. As a result the current leads were successfully tested with a ramping current of up to 104 kA. The current lead design, assembly work and the test results are presented.
Date:
September 1, 2005
Creator:
Huang, Yuenian; Foster, William; Kim, Seog-Whan; Mazur, Peter; Oleck, Andrew; Piekarz, Henryk et al.
Object Type:
Article
System:
The UNT Digital Library
103-06A - A1 - DOD Input - Army - Fort Monroe - VA
DOD Input - Army - Fort Monroe - VA - Includes: Memorandum for Army in reference to the issues/concerns/questions on Fort Monroe and slides from the Ft. Monroe base visit
Date:
July 1, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
103-06A-A20 - Base Input - Army - Red River Army Depot - Red River Army Depot informational briefing
Red River Army Depot informational briefing given by depot commander COL Gary Carney and Munitions Center Director Harrell Hignight on 06/21/05.
Date:
July 1, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
103-06A - A20 - Base Input - Army - Red River Army Depot - TX
Base Input - Army - Red River Army Depot - TX - Includes: PowerPoint Presentation Tab 1 is the presentation with data up to 053105. Tab 2 is the presentation with data up to 063005
Date:
July 1, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
103-06A - A20 - Base Input - Army - Red River Army Depot TX - Red River Defense Complex Community Briefings
Red River Defense Complex Community Briefings presented to Commissioners Hill and Turner on 06/21/05.
Date:
July 1, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
103-06A - A20 - BRAC Commission 06/21/05 Base Visit Book for Red River Army Depot
BRAC Commission 06/21/05 Base Visit Book for Red River Army Depot.
Date:
July 1, 2005
Creator:
unknown
Object Type:
Book
System:
The UNT Digital Library
103-06A - A6 - Base Input - Army - Rock Island Arsenal - IL
Base Input - Army - Rock Island Arsenal - IL - Includes: Itinerary for the visit of Mr. Samuel K. Skinner; List of attendees; PowerPoint presentation of BRAC Recommendations and Possible Changes prepared by Mr. Alan Wilson, Garrison Manager; and Rock Island Arsenal brochure.
Date:
July 1, 2005
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
103-06A -A6 - Base Input Army - Rock Island Arsenal - IL
Base Input - Army - Rock Island Arsenal - IL - Includes: PowerPoint Presentation from John Guzzonato Director, DFAS Rock Island
Date:
July 1, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
103-06A - A6 - Base Input - Army - Rock Island Arsenal IL - Mr. Samuel K. Skinner - US Army Garrison - Rock Island Arsenal - Installation Overview Briefing
Base Input - Army - Rock Island Arsenal IL - Mr. Samuel K. Skinner - US Army Garrison - Rock Island Arsenal - Installation Overview Briefing - PowerPoint Presentation made by Mr. Alan Wilson, Garrison Manager
Date:
July 1, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
103-06A-AF20 - Base Input - Air Force - Elmendorf Air Force Base/Kulis Air Guard Station/Eielson Air Force Base - AK
Base Input - Air Force - Elmendorf Air Force Base/Kulis Air Guard Station/Eielson Air Force Base - AK - Mr. Small BRAC Commission Visit - Includes: Powerpoint presentation from Lt. Col Pat McCrea; Eielson Air Force Base ALASKA Home of the Iceman Team Powerpoint Presentation; Welcome to the 176th Wing Kulis Air National Guard Base Alaska Report; biographies; Welcome to the 176th Wing Presentation
Date:
July 1, 2005
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library
103-06A - General - Community Input - Air Force - Western Pennsylvania
Community Input - Air Force - Western Pennsylvania - Includes Point Paper, Specific BRAC Impact Concerns
Date:
July 1, 2005
Creator:
United States. Defense Base Closure and Realignment Commission.
Object Type:
Text
System:
The UNT Digital Library