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378 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
Top physics: measurement of the tt-bar production cross section in p anti-p collisions at s**(1/2) = 1.96 tev using lepton + jets events with secondary vertex b-tagging
We present a measurement of the t{bar t} production cross section using events with one charged lepton and jets from p{bar p} collisions at a center-of-mass energy of 1.96TeV. In these events, heavy flavor quarks from top quark decay are identified with a secondary vertex tagging algorithm. From 162 pb{sup -1} of data collected by the Collider Detector at Fermilab, a total of 48 candidate events are selected, where 13.5 {+-} 1.8 events are expected from background contributions. We measure a t{bar t} production cross section of 5.6{sub -1.1}{sup _1.2}(stat.){sub -0.6}{sup +0.9}(syst.)pb.
Date:
April 7, 2005
Creator:
Acosta, D.
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
A DATA-CENTERED COLLABORATION PORTAL TO SUPPORT GLOBAL CARBON-FLUX ANALYSIS
Carbon-climate, like other environmental sciences, has been changing. Large-scalesynthesis studies are becoming more common. These synthesis studies are often conducted by science teams that are geographically distributed and on datasets that are global in scale. A broad array of collaboration and data analytics tools are now available that could support these science teams. However, building tools that scientists actually use is hard. Also, moving scientists from an informal collaboration structure to one mediated by technology often exposes inconsistencies in the understanding of the rules of engagement between collaborators. We have developed a scientific collaboration portal, called fluxdata.org, which serves the community of scientists providing and analyzing the global FLUXNET carbon-flux synthesis dataset. Key things we learned or re-learned during our portal development include: minimize the barrier to entry, provide features on a just-in-time basis, development of requirements is an on-going process, provide incentives to change leaders and leverage the opportunity they represent, automate as much as possible, and you can only learn how to make it better if people depend on it enough to give you feedback. In addition, we also learned that splitting the portal roles between scientists and computer scientists improved user adoption and trust. The fluxdata.org portal …
Date:
April 7, 2009
Creator:
Agarwal, Deborah A.; Humphrey, Marty; Beekwilder, Norm; Jackson, Keith; Goode, Monte & van Ingen, Catharine
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 13, Ed. 1 Thursday, April 7, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
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. 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. 107, No. 6, Ed. 1 Thursday, April 7, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[1st Naomi Bruton arts scholarship award winner]
Video recording from The Black Academy of Arts and Letters recorded following "Talking Funny With Hot Blues & Jazz" Saturday's performance. The footage shows the awarding of the 1st Naomi Burton Arts Scholarship. Performer Cece Antoinette is Naomi Brutons daughter.
Date:
April 7, 2001
Creator:
Antoinette, Cece; Kemp, Emme & King, Curtis
Object Type:
Video
System:
The UNT Digital Library
Measurements of Branching Fractions, Rate Asymmetries, and Angular Distributions in the Rare Decays B -> Kl+l- and B -> K*l+ l-
We present measurements of the flavor-changing neutral current decays B {yields} K{ell}{sup +}{ell}{sup -} and B {yields} K*{ell}{sup +}{ell}{sup -}, where {ell}{sup +}{ell}{sup -} is either an e{sup +}e{sup -} or {mu}{sup +}{mu}{sup -} pair. The data sample comprises 229 x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. Flavor-changing neutral current decays are highly suppressed in the Standard Model and their predicted properties could be significantly modified by new physics at the electroweak scale. We measure the branching fractions {Beta}(B {yields} K{ell}{sup +}{ell}{sup -}) = (0.34 {+-} 0.07 {+-} 0.02) x 10{sup -6}, {Beta}(B {yields} K*{ell}{sup +}{ell}{sup -}) = (0.78{sub -0.17}{sup +0.19} {+-} 0.11) x 10{sup -6}, the direct CP asymmetries of these decays, and the relative abundances of decays to electrons and muons. For two regions in {ell}{sup +}{ell}{sup -} mass, above and below m{sub J/{psi}}, we measure partial branching fractions and the forward-backward angular asymmetry of the lepton pair. In these same regions we also measure the K* longitudinal polarization in B {yields} K*{ell}{sup +}{ell}{sup -} decays. Upper limits are obtained for the lepton flavor-violating decays B {yields} Ke{mu} and B {yields} K*e{mu}. All measurements …
Date:
April 7, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
Search for the Charmed Pentaquark Candidate Theta_c(3100)^0 in e^+e^- Annihilations at \sqrt{s}=10.58 GeV
We search for the charmed pentaquark candidate reported by the H1 collaboration, the {Theta}{sub c}(3100){sup o}, in e{sup +}e{sup -} interactions at a center-of-mass (c.m.) energy of 10.58 GeV, using 124 fb{sup -1} of data recorded with the BABAR detector at the PEP-II e{sup +}e{sup -} facility at SLAC. We find no evidence for such a state in the same pD*{sup -} decay mode reported by H1, and we set limits on its production cross section times branching fraction into pD*{sup -} as a function of c.m. momentum. The corresponding limit on its total rate per e{sup +}e{sup -} {yields} q{bar q} event, times branching fraction, is about three orders of magnitude lower than rates measured for the charmed {Lambda}{sub c} and {Sigma}{sub c} baryons in such events.
Date:
April 7, 2006
Creator:
Aubert, B.
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
The Debt Limit: History and Recent Increases
This report gives an overview of the federal debt limit, its history, and recent increases
Date:
April 7, 2009
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
DIRECT ENERGY CONVERSION FISSION REACTOR ANNUAL REPORT FOR THE PERIOD OCTOBER 1, 2001 THROUGH DECEMBER 31, 2002
OAK-B135 DIRECT ENERGY CONVERSION FISSION REACTOR ANNUAL REPORT FOR THE PERIOD OCTOBER 1, 2001 THROUGH DECEMBER 31, 2002
Date:
April 7, 2003
Creator:
BROWN, L.C.
Object Type:
Report
System:
The UNT Digital Library
[Immigration Debates panel members]
Photograph of four panel members sitting at the Immigration Debates hosted by the UPC. Three men and a young woman (2nd left) can be seen sitting at a long table, facing the camera. Debate attendees are visible in the foreground of the photograph with their backs turned to the camera.
Date:
April 7, 2006
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
Noise Abatement and Control: An Overview of Federal Standards and Regulations
Constant or repeated exposure to sounds of 90 decibels or higher can lead to hearing loss, and noise exposure is responsible for hearing impairment in about 10 million people in the United States. To limit the public's exposure to potentially harmful sound levels, the federal government sets and enforces uniform noise control standards for aircraft and airports, interstate motor carriers and railroads, workplace activities, medium and heavy-duty trucks, motorcycles and mopeds, portable air compressors, and federally assisted housing projects located in noise exposed areas.
Date:
April 7, 2000
Creator:
Bearden, David M.
Object Type:
Report
System:
The UNT Digital Library
The Grandview Tribune (Grandview, Tex.), Vol. 111, No. 31, Ed. 1 Friday, April 7, 2006
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
April 7, 2006
Creator:
Beck-Adams, Candie
Object Type:
Newspaper
System:
The Portal to Texas History
Energy and Water Development: Appropriations for FY2006
None
Date:
April 7, 2005
Creator:
Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Gasoline Prices: Issues for the 110th Congress
This report reviews the major legislative initiatives to deal with the gasoline price issue.
Date:
April 7, 2008
Creator:
Behrens, Carl E. & Glover, Carol
Object Type:
Report
System:
The UNT Digital Library
Gasoline Prices: Policies and Proposals
This report gives information related to Gasoline prices and also discusses Policies and Proposals.
Date:
April 7, 2005
Creator:
Behrens, Carl E. & Glover, Carol
Object Type:
Report
System:
The UNT Digital Library
Acceleration for a High Energy Muon Collider
The authors describe a method for designing the acceleration systems for a muon collider, with particular application and examples for a high energy muon collider. This paper primarily concentrates on design considerations coming from longitudinal motion, but some transverse issues are briefly discussed.
Date:
April 7, 2000
Creator:
Berg, J. S.
Object Type:
Article
System:
The UNT Digital Library
Recirculating Acceleration
This paper compares various types of recirculating accelerators, outlining the advantages and disadvantages of various approaches. The accelerators are characterized according to the types of arcs they use: whether there is a single arc for the entire recirculator or there are multiple arcs, and whether the arc(s) are isochronous or non-isochronous.
Date:
April 7, 2000
Creator:
Berg, J. S.; Garren, A. A. & Johnstone, C.
Object Type:
Article
System:
The UNT Digital Library
Age of an Indonesian Fossil Tooth Determined by Electron Paramagnetic Resonance
The first fossil hominid tooth recovered during 1999 excavations from the Cisanca River region in West Java, Indonesia, was associated with a series of bovid teeth from a single individual that was recovered 190 cm beneath the hominid tooth. The age of the fossil bovid teeth was determined using electron paramagnetic resonance (EPR) analysis as part of an effort to bracket the age of the hominid tooth. The EPR-derived age of the bovid teeth is (5.16 {+-} 2.01) x 10{sup 5} years. However, the age estimate reported here is likely an underestimate of the actual age of deposition since evidence of heating was detected in the EPR spectra of the bovid teeth, and the heating may have caused a decrease in the intensity of EPR components on which the age calculation is based.
Date:
April 7, 2004
Creator:
Bogard, JS
Object Type:
Report
System:
The UNT Digital Library
Engineering Task Plan (ETN-98-0007) Preparation of the Long Length Contaminated Equipment Transport System (LLCETS) for Deployment
This task plan addresses the scope, schedule, and deliverables associated with preparation of the Long Length Contaminated Equipment Transport System for deployment in the Tank Farms.
Date:
April 7, 2000
Creator:
Boger, R. M.
Object Type:
Report
System:
The UNT Digital Library