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397 Matching Results
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Simulation of a Production Facility with an Automated Transport System
A model was needed to assess material throughput and validate the conceptual design of a production facility, including equipment lists and layout. The initial desire was to use a commercially available discrete event simulation package. However, the available software was found to be too limited in capability. Database interface software was used to develop autonomous intelligent manufacturing workstations and material transporters. The initial Extend model used to assess material throughput and develop equipment lists for the preconceptual design effort was upgraded with software add-ons from Simulation Dynamics, Inc. (SDI). Use of the SDI database interface allowed the upgraded model to include: 1. a material mass balance at any level of detail required by the user, and 2. a transport system model that includes all transport system movements, time delays, and transfers between systems. This model will assist in evaluating transport system capacity, sensitive time delays in the system, and optimal operating strategies. An additional benefit of using the SDI database interface is dramatically improved run time performance. This allows significantly more runs to be completed to provide better statistics for overall plant performance. The model has all system and process parameters entered into sub-component accessible tables. All information for the …
Date:
April 7, 2004
Creator:
ABRAMCZYK, GLENN
Object Type:
Report
System:
The UNT Digital Library
The Rheology of Concentrated Suspensions
Research program on the rheological properties of flowing suspensions. The primary purpose of the research supported by this grant was to study the flow characteristics of concentrated suspensions of non-colloidal solid particles and thereby construct a comprehensive and robust theoretical framework for modeling such systems quantitatively. At first glance, this seemed like a modest goal, not difficult to achieve, given that such suspensions were viewed simply as Newtonian fluids with an effective viscosity equal to the product of the viscosity of the suspending fluid times a function of the particle volume fraction. But thanks to the research findings of the Principal Investigator and of his Associates, made possible by the steady and continuous support which the PI received from the DOE Office of Basic Energy Sciences, the subject is now seen to be more complicated and therefore much more interesting in that concentrated suspensions have been shown to exhibit fascinating and unique rheological properties of their own that have no counterpart in flowing Newtonian or even non-Newtonian (polymeric) fluids. In fact, it is generally acknowledged that, as the result of these investigations for which the PI received the 2001 National Medal of Science, our understanding of how suspensions behave under …
Date:
September 7, 2004
Creator:
Acrivos, Andreas
Object Type:
Report
System:
The UNT Digital Library
Production of e+e- Pairs Accompanied by Nuclear Dissociation in Ultra-peripheral Heavy Ion Collisions
We present the first data on e{sup +}e{sup -} pair production accompanied by nuclear breakup in ultra-peripheral gold-gold collisions at a center of mass energy of 200 GeV per nucleon pair. The nuclear breakup requirement selects events at small impact parameters, where higher-order corrections to the pair production cross section should be enhanced. We compare the pair kinematic distributions with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED); the latter includes the photon virtuality. The cross section, pair mass, rapidity and angular distributions are in good agreement with both calculations. The pair transverse momentum, p{sub T}, spectrum agrees with the QED calculation, but not with the equivalent photon approach. We set limits on higher-order contributions to the cross section. The e{sup +} and e{sup -} p{sub T} spectra are similar, with no evidence for interference effects due to higher-order diagrams.
Date:
April 7, 2004
Creator:
Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Allgower, C.; Amonett, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Stability and Regeneration of Catalysts for the Destruction of Tars from Bio-mass Black Liquor Gasification
The goal of this project was to develop catalytic materials and processes that would be effective in the destruction of tars formed during the gasification of black liquor and biomass. We report here the significant results obtained at the conclusion of this two year project.
Date:
September 7, 2004
Creator:
Agrawal, Pradeep
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 40, Ed. 1 Thursday, October 7, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
October 7, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with John Alison, March 7, 2004
The National Museum of the Pacific War presents an oral interview with John Alison. Alsion was born in Florida in 1912 and graduated from the University of Florida. Soon after graduation he was accepted into the Army Flying School at Randolph Field, Texas. After competing primary flight training he moved to Kelly Field, Texas for advanced training and was selected to fly fighters. Upon receiving his wings in 1937 he was ordered to report to Langley Field, Virginia where he was assigned to the 8th Pursuit Group flying the PB2A pursuit plane. In 1940 the group moved to Mitchell, Field, New York and the 57th Pursuit Group was formed. Alison was named squadron commander of the 66th Pursuit Squadron. He was directed to demonstrate the Curtis P-40 fighter to General Claire Chennault and a group of Chinese generals. He describes his flight demonstration and the obvious satisfaction of shown by all concerned. In April 1941, he went to England with the Hubert Zemke to assist the Royal Air Force in the integration of the P-40 into the RAF. While there, he was selected to accompany American Ambassador Harry Hopkins as a military attaché of the US Embassy in Moscow. He …
Date:
March 7, 2004
Creator:
Alison, John R.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with John Alison, March 7, 2004
The National Museum of the Pacific War presents an oral interview with John Alison. Alsion was born in Florida in 1912 and graduated from the University of Florida. Soon after graduation he was accepted into the Army Flying School at Randolph Field, Texas. After competing primary flight training he moved to Kelly Field, Texas for advanced training and was selected to fly fighters. Upon receiving his wings in 1937 he was ordered to report to Langley Field, Virginia where he was assigned to the 8th Pursuit Group flying the PB2A pursuit plane. In 1940 the group moved to Mitchell, Field, New York and the 57th Pursuit Group was formed. Alison was named squadron commander of the 66th Pursuit Squadron. He was directed to demonstrate the Curtis P-40 fighter to General Claire Chennault and a group of Chinese generals. He describes his flight demonstration and the obvious satisfaction of shown by all concerned. In April 1941, he went to England with the Hubert Zemke to assist the Royal Air Force in the integration of the P-40 into the RAF. While there, he was selected to accompany American Ambassador Harry Hopkins as a military attaché of the US Embassy in Moscow. He …
Date:
March 7, 2004
Creator:
Alison, John R.
Object Type:
Text
System:
The Portal to Texas History
House and Senate Chaplains
This report
Date:
April 7, 2004
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 253, Ed. 1 Wednesday, January 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 304, Ed. 1 Sunday, March 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 6, Ed. 1 Wednesday, April 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 32, Ed. 1 Friday, May 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 58, Ed. 1 Monday, June 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 84, Ed. 1 Wednesday, July 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 136, Ed. 1 Tuesday, September 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 162, Ed. 1 Thursday, October 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 182, Ed. 1 Sunday, November 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 207, Ed. 1 Tuesday, December 7, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 7, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Individuals with Disabilities Education Act (IDEA): Selected Changes that Would be Made to the Law by S. 1248, 108th Congress
CRS Report for Congress entailing information about changes being made to the law because of the Individuals with Disabilities Act (IDEA). Topics include, eligibility by jurisdiction, safeguarding, evaluation and Individualized Education Programs (IEPS), etc..
Date:
May 7, 2004
Creator:
Apling, Richard N. & Jones, Nancy Lee
Object Type:
Report
System:
The UNT Digital Library
Fundamental study on kinetics and transport phenomena in low water dilute acid total hydrolysis of cellulosic biomass
The overall objective of this research is to delineate the process of the dilute-acid hydrolysis of biomass and seek better understanding of the reactions involving dilute-acid treatment of lignocellulosic biomass. Specifically the scope of the work entails the following two primary technical elements: Verification of the heterogeneous nature of the reaction mechanism in dilute-acid hydrolysis of cellulosic component of the biomass. Experimental investigation to identify the overall reaction pattern and the kinetic constants associated with dilute-acid hydrolysis of the cellulosic component of the agricultural residues.
Date:
April 7, 2004
Creator:
Auburn University
Object Type:
Report
System:
The UNT Digital Library
Bioremediation of Petroleum and Radiological Contaminated Soils at the Savannah River Site: Laboratory to Field Scale Applications
In the process of Savannah River Site (SRS) operations limited amounts of waste are generated containing petroleum, and radiological contaminated soils. Currently, this combination of radiological and petroleum contaminated waste does not have an immediate disposal route and is being stored in low activity vaults. SRS developed and implemented a successful plan for clean up of the petroleum portion of the soils in situ using simple, inexpensive, bioreactor technology. Treatment in a bioreactor removes the petroleum contamination from the soil without spreading radiological contamination to the environment. This bioreactor uses the bioventing process and bioaugmentation or the addition of the select hydrocarbon degrading bacteria. Oxygen is usually the initial rate-limiting factor in the biodegradation of petroleum hydrocarbons. Using the bioventing process allowed control of the supply of nutrients and moisture based on petroleum contamination concentrations and soil type. The results of this work have proven to be a safe and cost-effective means of cleaning up low level radiological and petroleum-contaminated soil. Many of the other elements of the bioreactor design were developed or enhanced during the demonstration of a ''biopile'' to treat the soils beneath a Polish oil refinery's waste disposal lagoons. Aerobic microorganisms were isolated from the aged refinery's …
Date:
June 7, 2004
Creator:
BRIGMON, ROBINL.
Object Type:
Article
System:
The UNT Digital Library
Measurement of 107Ag(alpha,gamma)111 In Cross Sections
Cross sections have been measured for the {sup 107}Ag({alpha},{gamma}){sup 111}In reaction at several a-particle energies between 7.8 MeV and 11.9 MeV. This reaction is of interest because it can provide a check on calculations of low-energy ({alpha},{gamma}) cross sections required for stellar nucleosynthesis predictions. Stacks of natural Ag foils of 1 mm thickness and 99.97% purity were bombarded with {sup 4}He{sup +} beams. Following irradiation, the yields of the 171-keV and 245-keV photons produced in the 2.805 day electron-capture decay of the {sup 111}In product nucleus were measured off-line. The Ag foils were interleaved with 99.6% purity, 6 {micro}m thick natural Ti foils so that known cross sections for the {sup 48}Ti({alpha},n) reaction could be used to check the accuracy of the beam current integration. For any given beam energy, beam energy degradation in the foils resulted in lower effective bombarding energies for successive foils in the stack, enabling measurements to be made for several energies per irradiation. The measured cross sections are compared with published statistical-model calculations.
Date:
October 7, 2004
Creator:
Baglin, C M; Norman, E B; Larimer, R & Rech, G A
Object Type:
Article
System:
The UNT Digital Library
Viscosity and mutual diffusion in strongly asymmetric plasma mixtures
The authors present molecular dynamics simulation results for the viscosity and mutual diffusion constant of a strongly asymmetric two-component plasma (TCP). They compare the results with available theoretical models previously tested for much smaller asymmetries. for the case of viscosity they propose a new predictive framework based on the linear mixing rule, while for mutual diffusion they point out some consistency problems of widely used Boltzmann equation based models.
Date:
September 7, 2004
Creator:
Bastea, S
Object Type:
Article
System:
The UNT Digital Library
Gasoline Prices: Policies and Proposals
This report details the information related to gasoline prices and discusses on policies and proposals.
Date:
October 7, 2004
Creator:
Behrens, Carl E. & Glover, Carol
Object Type:
Report
System:
The UNT Digital Library