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6,062 Matching Results

Start Over Decade 2000-2009 Day 26th Language English

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(open access)

Thermodynamic Phase And Chemical Equilibrium At 0-110 C For The H+-K+-Na+-Cl--H2O System Up To 16 Molal And The HNO3-H2O System Up To 20 Molal Using An Association-Based Pitzer Model Compatible With ASPEN Plus

A status is presented of the parameterization during FY2003 of an association-based Pitzer model to simulate chemical and phase equilibria of acid-chloride-nitrate-mercury aqueous electrolyte systems at 0-100 C within the industry-standard process simulator, ASPEN Plus. Compatibility with ASPEN Plus requires that the Pitzer model used be limited to the third virial coefficient and have the values of b and a1 as originally proposed by Pitzer. Two aqueous models for 0-110 C at atmospheric pressure were parameterized in FY03. The model for the aqueous H+-K+-Na+-Cl- system is applicable for 0-16 molal, and the HNO3-H2O for 0-20 molal. An association-based Pitzer activity coefficient model is combined with Henry's law to predict activity/osmotic coefficient and VLE. The chloride model also predicts KCl and NaCl solubility, while the nitric acid model has the unique capability of predicting extent of dissociation with an average absolute deviation of 1.43%. The association-based approach presented here extends the utility of the molality-based Pitzer model past 6 molal to predict activity/osmotic coefficients up to 16-20 molal. The association-based approach offers the additional benefits of predicting extent of dissociation and of allowing the Pitzer model to be fully utilized in commercial simulators, such as ASPEN Plus, that require accounting for …

Date: September 26, 2003

Creator: Nichols, T. T. & Taylor, D. D.

Object Type: Report

System: The UNT Digital Library

(open access)

Thorium Nitrate Stockpile--From Here to Eternity

The Defense National Stockpile Center (DNSC), a field level activity of the Defense Logistics Agency (DLA) has stewardship of a stockpile of thorium nitrate that has been in storage for decades. The stockpile is made up of approximately 3.2 million kg (7 million lb) of thorium nitrate crystals (hydrate form) stored at two depot locations in the United States. DNSC sought technical assistance from Oak Ridge National Laboratory (ORNL) to define and quantify the management options for the thorium nitrate stockpile. This paper describes methodologies and results comprising the work in Phase 1 and Phase 2. The results allow the DNSC to structure and schedule needed tasks to ensure continued safe long-term storage and/or phased disposal of the stockpile.

Date: February 26, 2003

Creator: Hermes, W. H.; Hylton, T. D.; Mattus, C.H.; Storch, S. N.; Singley, P.S.; W., Terry. J. et al.

Object Type: Article

System: The UNT Digital Library

transcript

Those Who Wait Upon the Lord

Lecture given Saturday, June 26, 2004 at Abilene Christian University

Date: June 26, 2004

Creator: Taylor, Jerry

Object Type: Sound

System: The Portal to Texas History

(open access)

Thoughts on Verification of Nuclear Disarmament

It is my pleasure to be here to day to participate in this Conference. My thanks to the organizers for preparing such an interesting agenda on a very difficult topic. My effort in preparing my presentation was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. And as many of you know Lawrence Livermore National Laboratory is now, as of Oct 1st, under contract to the Lawrence Livermore National Security LLC. There has been a long history of how to view verification of arms control agreements. The basis for verification during the days of SALT was that verification would be based on each country's national technical means. For treaties dealing with strategic missiles this worked well as the individual items subject to verification were of such a size that they were visible by the National Technical Means available at the time. And it was felt that the counting of missiles and launchers could be verified by our National Technical Means. For nuclear testing treaties the use of seismic measurements developed into a capability that was reasonably robust for all but the smallest of nuclear tests. However, once we …

Date: September 26, 2007

Creator: Dunlop, W H

Object Type: Article

System: The UNT Digital Library

(open access)

Three Affliated Tribes Renewable Energy Feasibility Study

The Three Affliated Tribes on the Fort Berthold Reservation studied the feasibility of a commercial wind facility on land selected and owned by the Tribes and examined the potential for the development of renewable energy resources on Tribal Lands.

Date: May 26, 2006

Creator: Pete, Belvin; Good, Kent; Gordon, Krista & Ed McCarthy,

Object Type: Report

System: The UNT Digital Library

[Three band members at Denton Arts & Jazz Festival, 2008]

Photograph of three members of a band performing during the Denton Arts & Jazz Festival. They are playing a clarinet, a sousaphone, and a banjo. Behind them is a table with drink coolers lined up on it and a large inflatable drink.

Date: April 26, 2008

Creator: Evans, Rebecca

Object Type: Photograph

System: The UNT Digital Library

(open access)

Three-Dimensional Radionuclide Transport Through the Unsaturated Zone of the Yucca Mountain Site 3 Colloids

The authors investigated colloid transport in the unsaturated fractured zone by means of three-dimensional site-scale numerical model under present-day climate infiltration, considering varying colloid diameters, kinetic declogging, and filtration. The radionuclide transport model was used to simulate continuous release of colloids into fractures throughout the proposed repository, in which any components of engineered barrier system such as waste package or drip shield were not considered. the results of the study indicate the importance of subsurface geology and site hydrology, i.e., the presence of faults (they dominate and control transport), fractures (the main migration pathways), and the relative distribution of zeolitic and vitric tuffs. The simulations indicate that (1) colloid transport is not significantly affected by varying the filtration parameters, (2) travel time to the water table decreases with the colloid size, (3) larger colloids show little retardation whereas very small ones are retarded significantly, and (4) fracture filtration can have an impact on transport. Because of uncertainties in the fundamentals of colloid transport and an extremely conservative approach (based on an improbably adverse worst-case scenario), caution should be exercised in the analysis and interpretation of the 3-D simulation results. The results discussed here should be viewed as an attempt to …

Date: January 26, 2007

Creator: Moridis, G. J. & Seol, Y.

Object Type: Article

System: The UNT Digital Library

[Three women hold signs during protest]

Three women hold up signs during a demonstration in Dallas, Texas against anti-immigration proposals before the U. S. Congress.

Date: March 26, 2006

Creator: Castillo, José L.

Object Type: Photograph

System: The UNT Digital Library

(open access)

Threshold Studies on TNT, Composition B, and C-4 Explosives Using the Steven Impact Test

Steven Impact Tests were performed at low velocity on the explosives TNT, Comp B, and C-4 in attempts to obtain a threshold for reaction. A 76 mm helium driven gas gun was used to accelerate the Steven Test projectiles up to approximately 200 m/s in attempts to react (ignite) the explosive samples. Blast overpressure gauges, acoustic microphones, standard video and high-speed photography were used to characterize the level of any high explosive reaction violence. No bulk reactions were observed in the TNT, Composition B, or C-4 explosive samples impacted up to velocities in the range of 190-200 m/s. This work will outline the experimental details and discuss the lack of reaction when compared to the reaction thresholds of other common explosives.

Date: September 26, 2005

Creator: Vandersall, K S; Switzer, L L & Garcia, F

Object Type: Article

System: The UNT Digital Library

(open access)

Throckmorton Tribune (Throckmorton, Tex.), Vol. 115, No. 5, Ed. 1 Thursday, October 26, 2000

Weekly newspaper from Throckmorton, Texas that includes local, state, and national news along with advertising.

Date: October 26, 2000

Creator: Mayes, Cecil

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Tiger (San Antonio, Tex.), Vol. 53, No. 1, Ed. 1 Tuesday, February 26, 2002

Monthly student newspaper from St. Philip's College in San Antonio, Texas that includes campus news along with advertising.

Date: February 26, 2002

Creator: Christine, Glynis & Agold, Cynthia

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Tiger (San Antonio, Tex.), Vol. 57, No. 4, Ed. 1 Tuesday, April 26, 2005

Monthly student newspaper from St. Philip's College in San Antonio, Texas that includes campus news along with advertising.

Date: April 26, 2005

Creator: Christine, Glynis & Agold, Cynthia

Object Type: Newspaper

System: The Portal to Texas History

Time capsule on the grounds of the Henderson County Courthouse

Time Capsule. Athens, Henderson, Texas. Buried July 4, 1976, to be opened July 4, 2076. So you might better know us.

Date: October 26, 2005

Creator: Belden, Dreanna L.

Object Type: Photograph

System: The Portal to Texas History

$Time-dependent amplitude analysis of $B^0 \to K^0_S\pi^ pi^-$$ (open access)

Time-dependent amplitude analysis of $B^0 \to K^0_S\pi^ pi^-$

In this paper we present results from a time-dependent amplitude analysis of the B{sup 0} {yields} K{sup 0}{sub s}{pi}{sup +}{pi}{sup -} decay. In Sec. II we describe the time-dependent DP formalism, and introduce the signal parameters that are extracted in the fit to data. In Sec. III we briefly describe the BABAR detector and the data set. In Sec. IV, we explain the selection requirements used to obtain the signal candidates and suppress backgrounds. In Sec. V we describe the fit method and the approach used to control experimental effects such as resolution. In Sec. VI we present the results of the fit, and extract parameters relevant to the contributing intermediate resonant states. In Sec. VII we discuss systematic uncertainties in the results, and finally we summarize the results in Sec. VIII.

Date: May 26, 2009

Creator: Aubert, B.

Object Type: Article

System: The UNT Digital Library

(open access)

Time-dependent CP-violation Parameters in B0 to eta' K0 Decay

The authors present measurements of time-dependent CP-violation asymmetries for the decays B{sup 0} {yields} {eta}'K{sup 0}. The data sample corresponds to 347 million B{bar B} pairs produced by e{sup +}e{sup -} annihilation at the {Upsilon}(4S) resonance in the PEP-II collider, and collected with the BABAR detector. The preliminary results are S = 0.55 {+-} 0.11 {+-} 0.02, and C = -0.015 {+-} 0.07 {+-} 0.03, where the first error quoted is statistical, the second systematic.

Date: September 26, 2006

Creator: Ulmer, K

Object Type: Article

System: The UNT Digital Library

(open access)

TIME RESOLVED X-RAY SPOT DIAGNOSTIC

A diagnostic was developed for the determination of temporal history of an X-ray spot. A pair of thin (0.5 mm) slits image the x-ray spot to a fast scintillator which is coupled to a fast detector, thus sampling a slice of the X-Ray spot. Two other scintillator/detectors are used to determine the position of the spot and total forward dose. The slit signal is normalized to the dose and the resulting signal is analyzed to get the spot size. The position information is used to compensate for small changes due to spot motion and misalignment. The time resolution of the diagnostic is about 1 ns and measures spots from 0.5 mm to over 3 mm. The theory and equations used to calculate spot size and position are presented, as well as data. The calculations assume a symmetric, Gaussian spot. The spot data is generated by the ETA II accelerator, a 2kA, 5.5 MeV, 60 ns electron beam focused on a Tantalum target. The spot generated is typically about 1 mm FWHM. Comparisons are made to an X-ray pinhole camera which images the X-Ray spot (in 2D) at four time slices.

Date: April 26, 2005

Creator: Richardson, R.; Guethlein, G.; Falabella, S.; Chambers, F.; Raymond, B. & Weir, J.

Object Type: Article

System: The UNT Digital Library

(open access)

Time-Temperature-Transformation Study of Simulated Hanford Tank Waste (AZ-101) and Optimization of Glass Formulation for Processing Such Waste

This paper presents the current results of a study for the optimization of the quality of the wasteform to be produced by vitrification of Hanford High Level Waste (HLW). A simulant of the content of Hanford Tank AZ-101 has been used for the experiments. A first phase of the research focused on the wasteform composition and showed that a high quality and chemical-resistant wasteform can be formed incorporating 60 weight % of dried waste into a borosilicate glass enriched with zinc oxide and boric acid and provided some indication about the heat treatment of the melt. A second phase of the study, still in progress, refines these findings. A detailed crystallinity survey of the waste form after various heat treatments has been performed, culminating in the development of a time-temperature-transformation (TTT) diagram. The results of the first phase of research and preliminary results from the second phase are described.

Date: February 26, 2003

Creator: Ramsey, W. G.; Kauffman, B. M.; Bricka, M.; Meaker, T. F.; Giordana, A.; Smith, J. D. et al.

Object Type: Article

System: The UNT Digital Library