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1,629 Matching Results
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[Transcript of Letter from J. L. Halbert to Fanny Halbert - December 13, 1864]
Transcript of letter from J. L. Halbert to his wife, Fanny Halbert, dated December 12, 1864. The letter gives an update on his health as well as instructions regarding her possible acquisition of a servant, and includes a few rumors he has heard regarding the war (Civil War).
Date:
October 2008
Creator:
Albritton, Helen
Object Type:
Letter
System:
The Portal to Texas History
Transport, Interfaces, and Modeling in Amorphous Silicon Based Solar Cells: Final Technical Report, 11 February 2002 - 30 September 2006
Results for a-Si characteristics/modeling; photocarrier drift mobilities in a-Si;H, ..mu..c-Si:H, CIGS; hole-conducting polymers as p-layer for a-Si and c-Si; IR spectra of p/i and n/i interfaces in a-Si.
Date:
October 1, 2008
Creator:
Schiff, E. A.
Object Type:
Report
System:
The UNT Digital Library
Transportation News, Volume 33, Number 5, September - October 2008
Newsletter published by the Texas Department of Transportation for TxDOT employees including information about the organization, projects throughout the state, and other topics related to transportation in Texas.
Date:
October 2008
Creator:
Texas. Department of Transportation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
[TXSSAR Committee Reports: October 2008]
Committee Reports for the Texas Society, Sons of the American Revolution October 2008 Board of Managers meeting.
Date:
October 2008
Creator:
Texas Society Sons of the American Revolution
Object Type:
Report
System:
The UNT Digital Library
[TXSSAR Officer Reports: October 2008]
Officer Reports for the Texas Society, Sons of the American Revolution October 2008 Board of Managers meeting.
Date:
October 2008
Creator:
Texas Society Sons of the American Revolution
Object Type:
Report
System:
The UNT Digital Library
The universal criterion for switching a magnetic vortex core in soft magnetic nanodots
The universal criterion for ultrafast vortex core switching between core-up and -down vortex bi-states in soft magnetic nanodots was empirically investigated by micromagnetic simulations and combined with an analytical approach. Vortex-core switching occurs whenever the velocity of vortex core motion reaches a critical value, which is {nu}{sub c} = 330 {+-} 37 m/s for Permalloy, as estimated from numerical simulations. This critical velocity was found to be {nu}{sub c} = {eta}{sub c}{gamma} {radical}A{sub ex} with A{sub ex} the exchange stiffness, {gamma} the gyromagnetic ratio, and an estimated proportional constant {eta}{sub c} = 1.66 {+-} 0.18. This criterion does neither depend on driving force parameters nor on the dimension or geometry of the magnetic specimen. The phase diagrams for the vortex core switching criterion and its switching time with respect to both the strength and angular frequency of circular rotating magnetic fields were derived, which offer practical guidance for implementing vortex core switching into future solid state information storage devices.
Date:
October 1, 2008
Creator:
Lee, K. S.; Kim, S. K.; Yu, Y. S.; Choi, Y. S.; Guslienko, K. Y.; Jung, H. et al.
Object Type:
Article
System:
The UNT Digital Library
[UNT Organ Majors Visiting the Meyerson Symphony Center]
Photograph of UNT College of Music, Organ majors posing in front of the Eugene McDermott Concert Hall. The students were visiting the Morton H. Meyerson Symphony Center in Dallas, Texas.
Date:
October 2008
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
Updated User's Guide for Sammy: Multilevel R-Matrix Fits to Neutron Data Using Bayes' Equations
In 1980 the multilevel multichannel R-matrix code SAMMY was released for use in analysis of neutron-induced cross section data at the Oak Ridge Electron Linear Accelerator. Since that time, SAMMY has evolved to the point where it is now in use around the world for analysis of many different types of data. SAMMY is not limited to incident neutrons but can also be used for incident protons, alpha particles, or other charged particles; likewise, Coulomb exit hannels can be included. Corrections for a wide variety of experimental conditions are available in the code: Doppler and resolution broadening, multiple-scattering corrections for capture or reaction yields, normalizations and backgrounds, to name but a few. The fitting procedure is Bayes' method, and data and parameter covariance matrices are properly treated within the code. Pre- and post-processing capabilities are also available, including (but not limited to) connections with the Evaluated Nuclear Data Files. Though originally designed for use in the resolved resonance region, SAMMY also includes a treatment for data analysis in the unresolved resonance region.
Date:
October 1, 2008
Creator:
Larson, Nancy M.
Object Type:
Report
System:
The UNT Digital Library
Uranyl Nitrate Flow Loop
The objectives of the work discussed in this report were to: (1) develop a flow loop that would simulate the purified uranium-bearing aqueous stream exiting the solvent extraction process in a natural uranium conversion plant (NUCP); (2) develop a test plan that would simulate normal operation and disturbances that could be anticipated in an NUCP; (3) use the flow loop to test commercially available flowmeters for use as safeguards monitors; and (4) recommend a flowmeter for production-scale testing at an NUCP. There has been interest in safeguarding conversion plants because the intermediate products [uranium dioxide (UO{sub 2}), uranium tetrafluoride (UF{sub 4}), and uranium hexafluoride (UF{sub 6})] are all suitable uranium feedstocks for producing special nuclear materials. Furthermore, if safeguards are not applied virtually any nuclear weapons program can obtain these feedstocks without detection by the International Atomic Energy Agency (IAEA). Historically, IAEA had not implemented safeguards until the purified UF{sub 6} product was declared as feedstock for enrichment plants. H. A. Elayat et al. provide a basic definition of a safeguards system: 'The function of a safeguards system on a chemical conversion plant is in general terms to verify that no useful nuclear material is being diverted to use in …
Date:
October 1, 2008
Creator:
Ladd-Lively, Jennifer L.
Object Type:
Report
System:
The UNT Digital Library
US RERTR FUEL DEVELOPMENT POST IRRADIATION EXAMINATION RESULTS
Post irradiation examinations of irradiated RERTR plate type fuel at the Idaho National Laboratory have led to in depth characterization of fuel behavior and performance. Both destructive and non-destructive examination capabilities at the Hot Fuels Examination Facility (HFEF) as well as recent results obtained are discussed herein. New equipment as well as more advanced techniques are also being developed to further advance the investigation into the performance of the high density U-Mo fuel.
Date:
October 1, 2008
Creator:
Robinson, A. B.; Wachs, D. M.; Burkes, D. E. & Keiser, D. D.
Object Type:
Article
System:
The UNT Digital Library
A User Driven Dynamic Circuit Network Implementation
The requirements for network predictability are becoming increasingly critical to the DoE science community where resources are widely distributed and collaborations are world-wide. To accommodate these emerging requirements, the Energy Sciences Network has established a Science Data Network to provide user driven guaranteed bandwidth allocations. In this paper we outline the design, implementation, and secure coordinated use of such a network, as well as some lessons learned.
Date:
October 1, 2008
Creator:
Guok, Chin; Robertson, David; Chaniotakis, Evangelos; Thompson, Mary; Johnston, William & Tierney, Brian
Object Type:
Article
System:
The UNT Digital Library
Using Electronic Neutron Generators in Active Interrogation to Detect Shielded Fissionable Material
Experiments have been performed at Idaho National Laboratory to study methodology and instrumentation for performing neutron active interrogation die-away analyses for the purpose of detecting shielded fissionable material. Here we report initial work using a portable DT electronic neutron generator with a He-3 fast neutron detector to detect shielded fissionable material including >2 kg quantities of enriched uranium and plutonium. Measurements have been taken of bare material as well as of material hidden within a large plywood cube. Results from this work have demonstrated the efficacy of the die-away neutron measurement technique for quickly detecting the presence of special nuclear material hidden within plywood shields by analyzing the time dependent neutron signals in-between neutron generator pulses. Using a DT electronic neutron generator operating at 300 Hz with a yield of approximately 0.36 x 10**8 neutrons per second, 2.2 kg of enriched uranium hidden within a 0.60 m x 0.60 m x 0.70 m volume of plywood was positively detected with a measurement signal 2-sigma above the passive background within 1 second. Similarly, for a 500 second measurement period a lower detection limit of approaching the gram level could be expected with the same simple set-up.
Date:
October 1, 2008
Creator:
Chichester, D. L. & Seabury, E. H.
Object Type:
Article
System:
The UNT Digital Library
Using laboratory flow experiments and reactive chemical transport modeling for designing waterflooding of the Agua Fria Reservoir, Poza Rica-Altamira Field, Mexico
Waterflooding for enhanced oil recovery requires that injected waters must be chemically compatible with connate reservoir waters, in order to avoid mineral dissolution-and-precipitation cycles that could seriously degrade formation permeability and injectivity. Formation plugging is a concern especially in reservoirs with a large content of carbonates, such as calcite and dolomite, as such minerals typically react rapidly with an aqueous phase, and have strongly temperature-dependent solubility. Clay swelling can also pose problems. During a preliminary waterflooding pilot project, the Poza Rica-Altamira oil field, bordering the Gulf coast in the eastern part of Mexico, experienced injectivity loss after five months of reinjection of formation waters into well AF-847 in 1999. Acidizing with HCl restored injectivity. We report on laboratory experiments and reactive chemistry modeling studies that were undertaken in preparation for long-term waterflooding at Agua Frma. Using analogous core plugs obtained from the same reservoir interval, laboratory coreflood experiments were conducted to examine sensitivity of mineral dissolution and precipitation effects to water composition. Native reservoir water, chemically altered waters, and distilled water were used, and temporal changes in core permeability, mineral abundances and aqueous concentrations of solutes were monitored. The experiments were simulated with the multi-phase, nonisothermal reactive transport code TOUGHREACT, …
Date:
October 1, 2008
Creator:
Birkle, P.; Pruess, K.; Xu, T.; Figueroa, R.A. Hernandez; Lopez, M. Diaz & Lopez, E. Contreras
Object Type:
Article
System:
The UNT Digital Library
Utility Best Practices Guidance for Providing Business Customers with Energy Use and Cost Data
This publication is the major findings on activity of the National Action Plan for Energy Efficiency. The document addresses the need for utility practices to provide customers with use and cost information.
Date:
October 2008
Creator:
National Action Plan for Energy Efficiency
Object Type:
Text
System:
The UNT Digital Library
Vehicle Testing and Analysis Group: Center for Transportation Technologies and Systems (CTTS) (Brochure)
Describes NREL's Vehicle Testing and Analysis Group's work in vehicle and fleet evaluations, testing, data, and analysis for government and industry partners.
Date:
October 1, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Very first tests on SOLEIL regarding the Zn environment in pathological calcifications made of apatite determined by X-ray absorption spectroscopy
This very first report of a X-ray absorption spectroscopy experiment on Soleil is part of a more large long term study dedicated to ectopic calcifications. Such biological entities composed of various inorganic and/or organic compounds contain also trace elements. In the case of urinary calculi, different papers already published point out that these oligo elements may promote or inhibit crystal nucleation or growth of mineral or organic species involved. By using such tool specific to synchrotron radiation i.e. determine the local environment of oligoelements and thus their occupation site, we contribute to our understanding of the role of trace elements in ectopic calcifications.
Date:
October 1, 2008
Creator:
Bazin, D.; Carpentier, X.; Traxer, O.; Thiaudiere, D.; Somogyi, A.; Reguer, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Very Large System Dynamics Models - Lessons Learned
This paper provides lessons learned from developing several large system dynamics (SD) models. System dynamics modeling practice emphasize the need to keep models small so that they are manageable and understandable. This practice is generally reasonable and prudent; however, there are times that large SD models are necessary. This paper outlines two large SD projects that were done at two Department of Energy National Laboratories, the Idaho National Laboratory and Sandia National Laboratories. This paper summarizes the models and then discusses some of the valuable lessons learned during these two modeling efforts.
Date:
October 1, 2008
Creator:
Jacobson, Jacob J. & Malczynski, Leonard
Object Type:
Article
System:
The UNT Digital Library
Věstník (Temple, Tex.), Vol. 96, No. 39, Ed. 1 Wednesday, October 1, 2008
Weekly Czech and English language newspaper from Temple, Texas published as the official organ of the Slavonic Benevolent Order of the State of Texas that includes news of interest to members along with advertising.
Date:
October 1, 2008
Creator:
Zavodny, Melanie
Object Type:
Newspaper
System:
The Portal to Texas History
World Biofuels Study
This report forms part of a project entitled 'World Biofuels Study'. The objective is to study world biofuel markets and to examine the possible contribution that biofuel imports could make to help meet the Renewable Fuel Standard (RFS) of the Energy Independence and Security Act of 2007 (EISA). The study was sponsored by the Biomass Program of the Assistant Secretary for Energy Efficiency and Renewable Energy (EERE), U.S. Department of Energy. It is a collaborative effort among the Office of Policy and International Affairs (PI), Department of Energy and Oak Ridge National Laboratory (ORNL), National Renewable Energy Laboratory (NREL) and Brookhaven National Laboratory (BNL). The project consisted of three main components: (1) Assessment of the resource potential for biofuel feedstocks such as sugarcane, grains, soybean, palm oil and lignocellulosic crops and development of supply curves (ORNL). (2) Assessment of the cost and performance of biofuel production technologies (NREL). (3) Scenario-based analysis of world biofuel markets using the ETP global energy model with data developed in the first parts of the study (BNL). This report covers the modeling and analysis part of the project conducted by BNL in cooperation with PI. The Energy Technology Perspectives (ETP) energy system model was used …
Date:
October 1, 2008
Creator:
Alfstad,T.
Object Type:
Report
System:
The UNT Digital Library
Yoakum Herald-Times (Yoakum, Tex.), Vol. 116, No. 40, Ed. 1 Wednesday, October 1, 2008
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2008
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Zn-Site Determination in Protein Encapsulated ZnxFe3-xO4 Nanoparticles
The X-ray absorption spectra of the Fe and Zn L-edges for 6.7 nm Fe{sub 3}O{sub 4} nanoparticles grown inside 12 nm ferritin protein cages with 10%, 15%, 20% and 33% zinc doping, shows that the Zn is substitutional as Zn{sup 2+} within the iron oxide host structure. A Neel-Arrhenius plot of the blocking temperature in the frequency dependent ac-susceptibility measurements show that the particles are non-interacting and that the anisotropy energy barrier is reduced with Zn loading. X-ray magnetic circular dichroism (XMCD) of the Fe displays a linear decrease with Zn-doping in sharp contrast to the initial increase present in the bulk system. The most plausible explanation for the moment decrease is that Zn substitutes preferentially into the tetrahedral A-site as a Zn{sup 2+} cation, generating a mixed spinel.
Date:
October 1, 2008
Creator:
Pool, V. L.; Klem, M. T.; Holroyd, J.; Harris, T.; Arenholz, E.; Young, M. et al.
Object Type:
Article
System:
The UNT Digital Library