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1 - 24 of
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Thermal characteristics of air flow cooling in the lithium ion batteries experimental chamber
A battery pack prototype has been designed and built to evaluate various air cooling concepts for the thermal management of Li-ion batteries. The heat generation from the Li-Ion batteries was simulated with electrical heat generation devices with the same dimensions as the Li-Ion battery (200 mm x 150 mm x 12 mm). Each battery simulator generates up to 15W of heat. There are 20 temperature probes placed uniformly on the surface of the battery simulator, which can measure temperatures in the range from -40 C to +120 C. The prototype for the pack has up to 100 battery simulators and temperature probes are recorder using a PC based DAQ system. We can measure the average surface temperature of the simulator, temperature distribution on each surface and temperature distributions in the pack. The pack which holds the battery simulators is built as a crate, with adjustable gap (varies from 2mm to 5mm) between the simulators for air flow channel studies. The total system flow rate and the inlet flow temperature are controlled during the test. The cooling channel with various heat transfer enhancing devices can be installed between the simulators to investigate the cooling performance. The prototype was designed to configure …
Date:
July 8, 2012
Creator:
A., Lukhanin; U., Rohatgi; Belyaev, A.; Fedorchenko, D.; Khazhmuradov, M.; Lukhanin, O et al.
Object Type:
Article
System:
The UNT Digital Library
2013 Inorganic Reaction Mechanisms Gordon Research Conference (March 3-8, 2013 - Hotel Galvez, Galveston TX)
The 2013 Gordon Conference on Inorganic Reaction Mechanisms will present cutting-edge research on the molecular aspects of inorganic reactions involving elements from throughout the periodic table and state-of-the art techniques that are used in the elucidation of reaction mechanisms. The Conference will feature a wide range of topics, such as homogeneous and heterogeneous catalysis, metallobiochemistry, electron-transfer in energy reactions, polymerization, nitrogen fixation, green chemistry, oxidation, solar conversion, alkane functionalization, organotransition metal chemistry, and computational chemistry. The talks will cover themes of current interest including energy, materials, and bioinorganic chemistry. Sections cover: Electron-Transfer in Energy Reactions; Catalytic Polymerization and Oxidation Chemistry; Kinetics and Spectroscopy of Heterogeneous Catalysts; Metal-Organic Chemistry and its Application in Synthesis; Green Energy Conversion;Organometallic Chemistry and Activation of Small Molecules; Advances in Kinetics Modeling and Green Chemistry; Metals in Biology and Disease; Frontiers in Catalytic Bond Activation and Cleavage.
Date:
December 8, 2012
Creator:
Abu-Omar, Mahdi M.
Object Type:
Article
System:
The UNT Digital Library
SELECTION OF SURPLUS PLUTONIUM MATERIALS FOR DISPOSITION TO WIPP
The U.S. Department of Energy (DOE) is preparing a Surplus Plutonium Disposition (SPD) Supplemental Environmental Impact Statement (SEIS). Included in the evaluation are up to 6 metric tons (MT) of plutonium in the form of impure oxides and metals for which a disposition plan has not been decided, among options that include preparation as feed for the Mixed Oxide Fuel Fabrication Facility; disposing to high-level waste through the Savannah River Site (SRS) HB Line and H Canyon; can-in-canister disposal using the SRS Defense Waste Processing Facility; and preparation for disposal at the Waste Isolation Pilot Plant (WIPP). DOE and SRS have identified at least 0.5 MT of plutonium that, because of high levels of chemical and isotopic impurities, is impractical for disposition by methods other than the WIPP pathway. Characteristics of these items and the disposition strategy are discussed.
Date:
June 8, 2012
Creator:
Allender, J.; Mcclard, J. & Christopher, J.
Object Type:
Article
System:
The UNT Digital Library
Jet Substructure at the Tevatron And LHC: New Results, New Tools, New Benchmarks
None
Date:
November 8, 2012
Creator:
Altheimer, A.; U., /Columbia; Arora, S.; /Rutgers U., Piscataway; Asquith, L.; /Argonne et al.
Object Type:
Article
System:
The UNT Digital Library
Solid State Electron Transfer via Bacterial Nanowires: Contributions Toward a Mechanistic Understanding of Geophysical Response of Biostimulated Subsurface
The degradation of organic matter by microorganisms provides a source of electrical potential or so-called 'self potential' (SP) that can be measured by using a voltmeter. During this process electrons are being produced as a waste-product and bacterial cells have to dispose of these to allow for the complete biodegradation of organic matter. Especially in anaerobic microbial communities, exo-cellular electron transfer is the most important driving force behind this process and organisms have developed different, but also similar, ways to transfer electrons to other microorganisms. Recently, it has been postulated that direct electron transfer from cell-to-cell is actually done by 'hard-wired' microorganisms. This shuttling of electrons is most likely done by certain c-type cytochromes that form the functional part of electrically conductive nanowires. In this study we investigated if nanowires can explain the geoelectrical (self potential and spectral induced polarization) signals observed at some biostimulated environments such as DOE sites. The objectives of our project are to: (1) investigate any temporal changes in the geophysical signatures (Self Potential (SP) and Induced Polarization (IP)) associated with nanowires of the bacterium Shewanella oneidensis MR-1, wild type and mtrc/omcA deletion mutant, (2) demonstrate that mutant strains of bacteria that produce nonconductive nanowires do …
Date:
May 8, 2012
Creator:
Atekwana, Estella
Object Type:
Report
System:
The UNT Digital Library
Getting to know you... LEAP
This presentation discusses LEAP and getting to know students, mentors, and the University of North Texas (UNT) College of Information faculty.
Date:
December 8, 2012
Creator:
Avery, Elizabeth Fuseler & Batman, Cindy
Object Type:
Presentation
System:
The UNT Digital Library
Lithium Ion Cell Development for Photovoltaic Energy Storage Applications
The overall project goal is to reduce the cost of home and neighborhood photovoltaic storage systems by reducing the single largest cost component – the energy storage cells. Solar power is accepted as an environmentally advantaged renewable power source. Its deployment in small communities and integrated into the grid, requires a safe, reliable and low cost energy storage system. The incumbent technology of lead acid cells is large, toxic to produce and dispose of, and offer limited life even with significant maintenance. The ideal PV storage battery would have the safety and low cost of lead acid but the performance of lithium ion chemistry. Present lithium ion batteries have the desired performance but cost and safety remain the two key implementation barriers. The purpose of this project is to develop new lithium ion cells that can meet PVES cost and safety requirements using A123Systems phosphate-based cathode chemistries in commercial PHEV cell formats. The cost target is a cell design for a home or neighborhood scale at <$25/kWh. This DOE program is the continuation and expansion of an initial MPSC (Michigan Public Service Commission) program towards this goal. This program further pushes the initial limits of some aspects of the original …
Date:
February 8, 2012
Creator:
Babinec, Susan
Object Type:
Report
System:
The UNT Digital Library
LCLS-II New Instruments Workshops Report
The LCLS-II New Instruments workshops chaired by Phil Heimann and Jerry Hastings were held on March 19-22, 2012 at the SLAC National Accelerator Laboratory. The goal of the workshops was to identify the most exciting science and corresponding parameters which will help define the LCLS-II instrumentation. This report gives a synopsis of the proposed investigations and an account of the workshop. Scientists from around the world have provided short descriptions of the scientific opportunities they envision at LCLS-II. The workshops focused on four broadly defined science areas: biology, materials sciences, chemistry and atomic, molecular and optical physics (AMO). Below we summarize the identified science opportunities in the four areas. The frontiers of structural biology lie in solving the structures of large macromolecular biological systems. Most large protein assemblies are inherently difficult to crystallize due to their numerous degrees of freedom. Serial femtosecond protein nanocrystallography, using the 'diffraction-before-destruction' approach to outrun radiation damage has been very successfully pioneered at LCLS and diffraction patterns were obtained from some of the smallest protein crystals ever. The combination of femtosecond x-ray pulses of high intensity and nanosized protein crystals avoids the radiation damage encountered by conventional x-ray crystallography with focused beams and opens the …
Date:
August 8, 2012
Creator:
Baradaran, Samira; Bergmann, Uwe; Durr, Herrmann; Gaffney, Kelley; Goldstein, Julia; Guehr, Markus et al.
Object Type:
Article
System:
The UNT Digital Library
"Fine grain Nb tube for SRF cavities"
Superconducting radio frequency (SRF) cavities used in charged particle linear accelerators, are currently fabricated by deep drawing niobium sheets and welding the drawn dishes together. The Nb sheet has a non-uniform microstructure, which leads to unpredictable cavity shape and surface roughness, and inconsistent "spring-back" during forming. In addition, weld zones cause hot spots during cavity operation. These factors limit linear accelerator performance and increase cavity manufacturing cost. Equal channel angular extrusion (ECAE) can be used to refine and homogenize the microstructure of Nb tube for subsequent hydroforming into SRF cavities. Careful selection of deformation and heat treatment conditions during the processing steps can give a uniform and consistent microstructure in the tube, leading to improved deformability and lower manufacturing costs. Favorable microstructures were achieved in short test samples of RRR Nb tube, which may be particularly suitable for hydroforming into SRF cavity strings. The approach demonstrated could be applicable to microstructure engineering of other tube materials including tantalum, titanium, and zirconium.
Date:
July 8, 2012
Creator:
Barber, Robert E.
Object Type:
Report
System:
The UNT Digital Library
Production of Energy Efficient Preform Structures (PEEPS)
Due to its low density, good structural characteristics, excellent fabrication properties, and attractive appearance, aluminum metal and its alloys continue to be widely utilized. The transportation industry continues to be the largest consumer of aluminum products, with aerospace as the principal driver for this use. Boeing has long been the largest single company consumer of heat-treated aluminum in the U.S. The extensive use of aluminum to build aircraft and launch vehicles has been sustained, despite the growing reliance on more structurally efficient carbon fiber reinforced composite materials. The trend in the aerospace industry over the past several decades has been to rely extensively on large, complex, thin-walled, monolithic machined structural components, which are fabricated from heavy billets and thick plate using high speed machining. The use of these high buy-to-fly ratio starting product forms, while currently cost effective, is energy inefficient, with a high environmental impact. The widespread implementation of Solid State Joining (SSJ) technologies, to produce lower buy-to-fly ratio starting forms, tailored to each specific application, offers the potential for a more sustainable manufacturing strategy, which would consume less energy, require less material, and reduce material and manufacturing costs. One objective of this project was to project the energy …
Date:
June 8, 2012
Creator:
Baumann, John A.
Object Type:
Report
System:
The UNT Digital Library
Energy Policy: 112th Congress Issues and Legislative Proposals
This report discusses the energy policy in the United States, which has focused on three major goals: assuring a secure supply of energy, keeping energy costs low, and protecting the environment.
Date:
November 8, 2012
Creator:
Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Mexico's Drug Trafficking Organizations: Source and Scope of the Rising Violence
This report provides background on drug trafficking in Mexico: it identifies the major drug trafficking organizations (DTOs); how the organized crime “landscape” has been altered by fragmentation; and analyzes the context, scope, and scale of the violence. It examines current trends of the violence, analyzes prospects for curbing violence in the future, and compares it with violence in Colombia.
Date:
June 8, 2012
Creator:
Beittel, June S.
Object Type:
Report
System:
The UNT Digital Library
High Multiplicity Processes at NLO with BlackHat and Sherpa
None
Date:
November 8, 2012
Creator:
Bern, Zvi; Ozeren, Kemal; Dixon, Lance J.; Hoeche, Stefan; Cordero, Fernando Febres; Ita, Harald et al.
Object Type:
Article
System:
The UNT Digital Library
A New Scheme for Stigmatic X-ray Imaging with Large Magnification
This paper describes a new x-ray scheme for stigmatic imaging. The scheme consists of one convex spherically bent crystal and one concave spherically bent crystal. The radii of curvature and Bragg reflecting lattice planes of the two crystals are properly matched to eliminate the astigmatism, so that the conditions for stigmatic imaging are met for a particular wavelength. The magnification is adjustable and solely a function of the two Bragg angles or angles of incidence. Although the choice of Bragg angles is constrained by the availability of crystals, this is not a severe limitation for the imaging of plasmas, since a particular wavelength can be selected from the bremsstrahlung continuum. The working principle of this imaging scheme has been verified with visible light. Further tests with x rays are planned for the near future. 2012 American Institute of Physics
Date:
August 8, 2012
Creator:
Bitter, M.; Delgado-Aprico, L. F.; Pablant, N. A.; Scott, S.; Jones, F.; Beiersdorfer, P. et al.
Object Type:
Report
System:
The UNT Digital Library
Particle Size-Dependent Photoelectron Plasmon Loss Features In Deposited Germanium Nanocrystals
None
Date:
March 8, 2012
Creator:
Bostedt, C; Willey, T; Terminello, L & van Buuren, T
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Jill Labbe, November 8, 2012
Interview with Jill "J.R." Labbe, a journalist in Fort Worth, Texas. The interview includes biographical information about her life growing up, her educational background, and her career as an editorial director for the Fort Worth Star-Telegram.
Date:
November 8, 2012
Creator:
Bowden, George; Francesco, Beth & Labbe, Jill
Object Type:
Text
System:
The UNT Digital Library
Not in My Back Yard!
This presentation is part of the faculty lecture series UNT Speaks Out on Gas Well Drilling Redux. This presentation discusses the 'not in my back yard' (NIMBY) attitude - opposition by residents to a proposal for new development that is close to their homes - and focus on whether is it principled or hypocritical to simultaneously oppose the development while benefiting economically from it.
Date:
February 8, 2012
Creator:
Briggle, Adam
Object Type:
Presentation
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Saturday, December 8, 2012
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 8, 2012
Creator:
Bright, James
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Express-Star (Chickasha, Okla.), Ed. 1 Saturday, September 8, 2012
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 8, 2012
Creator:
Bright, James
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Express-Star (Chickasha, Okla.), Ed. 1 Thursday, November 8, 2012
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 8, 2012
Creator:
Bright, James
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, August 8, 2012
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 8, 2012
Creator:
Bright, James
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Canadian Record (Canadian, Tex.), Vol. 122, No. 10, Ed. 1 Thursday, March 8, 2012
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
March 8, 2012
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 122, No. 45, Ed. 1 Thursday, November 8, 2012
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
November 8, 2012
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Integrated, Geothermal-CO2 Storage Reservoirs: Adaptable, Multi-Stage, Sustainable, Energy-Recovery Strategies that Reduce Carbon Intensity and Environmental Risk
None
Date:
May 8, 2012
Creator:
Buscheck, T A; Elliot, T R; Celia, M A; Chen, M; Hao, Y; Lu, C et al.
Object Type:
Article
System:
The UNT Digital Library