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507 Matching Results
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Multivariate Clustering of Large-Scale Simulation Data
Simulations of complex scientific phenomena involve the execution of massively parallel computer programs. These simulation programs generate large-scale data sets over the spatiotemporal space. Modeling such massive data sets is an essential step in helping scientists discover new information from their computer simulations. In this paper, we present a simple but effective multivariate clustering algorithm for large-scale scientific simulation data sets. Our algorithm utilizes the cosine similarity measure to cluster the field variables in a data set. Field variables include all variables except the spatial (x, y, z) and temporal (time) variables. The exclusion of the spatial space is important since 'similar' characteristics could be located (spatially) far from each other. To scale our multivariate clustering algorithm for large-scale data sets, we take advantage of the geometrical properties of the cosine similarity measure. This allows us to reduce the modeling time from O(n{sup 2}) to O(n x g(f(u))), where n is the number of data points, f(u) is a function of the user-defined clustering threshold, and g(f(u)) is the number of data points satisfying the threshold f(u). We show that on average g(f(u)) is much less than n. Finally, even though spatial variables do not play a role in building …
Date:
March 4, 2003
Creator:
Eliassi-Rad, T. & Critchlow, T.
Object Type:
Article
System:
The UNT Digital Library
Extending the 2001, 2003, and 2004 Tax Cuts
This report discusses the Economic Growth and Tax Relief Reconciliation Act of 2001, the Jobs and Growth Tax Relief Reconciliation Act of 2003 (JGTRRA, and the Working Family Tax Relief Act of 2004 (WFTRA). Since all of the tax reductions provisions of all three of these acts expire at some point in the future, Congress faces the issue of whether to extend and/or make the reductions permanent. Extending these tax reductions, however, is likely to significantly reduce federal revenues in the future.
Date:
March 4, 2005
Creator:
Esenwein, Gregg A.
Object Type:
Report
System:
The UNT Digital Library
[Roundtable writer's breakfast with Mari Evans]
Video recording from The Black Academy of Arts and Letters recorded during their roundtable writers breakfast featuring author Mari Evans held on March 4th, 2006. The footage shows Evans leading a dialogue on her new book covering the black women writers of the 1950s through the 1980s along with her struggles with being a writer.
Date:
March 4, 2006
Creator:
Evans, Mari & King, Curtis
Object Type:
Video
System:
The UNT Digital Library
Crystal Structure of the Bromide-Bound D85S Mutant of Bacteriorhodopsin: Principles of Ion Pumping
None
Date:
March 4, 2004
Creator:
Facciotti, Marc T.; Cheung, Vincent S.; Nguyen, Doris; Rouhani, Shahab & Glaeser, Robert M.
Object Type:
Article
System:
The UNT Digital Library
The Use of Haz-Flote to Efficiently Remove Mercury from Contaminated Materials
None
Date:
March 4, 2009
Creator:
Fallgren, Paul & Bland, Alan
Object Type:
Report
System:
The UNT Digital Library
Surface Transportation: Reauthorization of TEA-21
This report briefly examines the debate regarding spending levels to reauthorize federal highway, highway safety, and transit programs.
Date:
March 4, 2005
Creator:
Fischer, John W.
Object Type:
Report
System:
The UNT Digital Library
Beat wave injection of electrons into plasma waves using two interfering laser pulses
An electron injector concept that uses a single injection laser pulse colliding with a pump laser pulse in a plasma is analyzed. The pump pulse generates a large amplitude laser wakefield (plasma wave). The counter propagating injection pulse collides with the pump laser pulse to generate a beat wave with a slow phase velocity. The ponderomotive force of the slow beat wave is responsible for injecting plasma electrons into the wakefield near the back of the pump pulse. Test particle simulations indicate that significant amounts of charge can be trapped and accelerated ({approx} 10 pC). For higher charge, beam loading limits the validity of the simulations. The accelerated bunches are ultrashort ({approx} 1 fs) with good beam quality (relative energy spread of a few percent at a mean energy of {approx} 10 MeV and a normalized rms emittance on the order 0.4 mm.mrad). The effects of interaction angle and polarization are also explored, e.g., efficient trapping can occur for near-collinear geometries. Beat wave injection using a single injection pulse has the advantages of simplicity, ease of experimental implementation, and requires modest laser intensity I {approx_equal} 8.8 x 10{sup 17} W/cm{sup 2}.
Date:
March 4, 2004
Creator:
Fubiani, G.; Esarey, E.; Schroeder, C. B. & Leemans, W. P.
Object Type:
Article
System:
The UNT Digital Library
Title IX and Sex Discrimination in Education: An Overview
This report provides an overview of Title IX of the Education Amendments of 1972, and the various aspects of education affected by this law. Although Title IX has been only partially successful in eliminating sex discrimination in education, the effects of this legislation have been far-reaching.
Date:
March 4, 2004
Creator:
Galemore, Gary L.
Object Type:
Report
System:
The UNT Digital Library
Pawhuska Journal-Capital (Pawhuska, Okla.), Vol. 90, No. 19, Ed. 1 Saturday, March 4, 2000
Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 4, 2000
Creator:
Gann, Sherry
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Rambler (Fort Worth, Tex.), Vol. 102, No. 7, Ed. 1 Wednesday, March 4, 2009
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
March 4, 2009
Creator:
Garcia, Martin
Object Type:
Newspaper
System:
The Portal to Texas History
Campaign Finance: Potential Legislative and Policy Issues for the 111th Congress
This report discusses selected campaign finance policy issues that may receive attention during the 111th congress. Questions about the health of the presidential public financing system were especially prominent during the 2008 election cycle.
Date:
March 4, 2009
Creator:
Garrett, R. Sam
Object Type:
Report
System:
The UNT Digital Library
Caspian Oil and Gas: Production and Prospects
There is a likelihood of large reserves of crude oil and natural gas in the Caspian Sea region, and a consequent large increase in oil and natural gas production from that area. Because diversity of energy sources is a consideration in Congressional deliberations on energy policy, this prospect could play a role in such discussions. However, there are notable obstacles to increases in Caspian Sea region production of oil and gas that may slow development.
Date:
March 4, 2005
Creator:
Gelb, Bernard A.
Object Type:
Report
System:
The UNT Digital Library
The Rice Thresher, Vol. 92, No. 21, Ed. 1 Friday, March 4, 2005
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
March 4, 2005
Creator:
Gilbert, Lindsey & Yardley, Jonathan
Object Type:
Newspaper
System:
The Portal to Texas History
South Texas Catholic (Corpus Christi, Tex.), Vol. 40, No. 5, Ed. 1 Friday, March 4, 2005
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
March 4, 2005
Creator:
Goldapp, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
Russian Political, Economic, and Security Issues and U.S. Interests
This report discusses the current political and economic conditions in Russia, focusing on the impact of Vladimir Putin's leadership and the leadership of his successor/protégé, Dmitriy Medvedev. The report also discusses the state of the economy since the Soviet collapse in 1999, how the recent global economic downturn has affected Russia, the state of Russia's military, and the current relationship between Russia and the United States.
Date:
March 4, 2008
Creator:
Goldman, Stuart D.
Object Type:
Report
System:
The UNT Digital Library
Higher Education Tax Credits: An Economic Analysis
This report provides analysis of the education tax credit program.
Date:
March 4, 2009
Creator:
Gonzalez, Christian & Keightley, Mark P.
Object Type:
Report
System:
The UNT Digital Library
Today Cedar Hill (Duncanville, Tex.), Vol. 38, No. 49, Ed. 1 Thursday, March 4, 2004
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
March 4, 2004
Creator:
Gooch, Robin
Object Type:
Newspaper
System:
The Portal to Texas History
Defense Acquisition Reform: Status and Current Issues
The end of the Cold War and its impact on defense spending has created a strong need to reform Department of Defense’s (DOD) acquisition system. With procurement spending down, DOD expects to depend on savings from acquisition reform to help finance future force modernization. Policymakers believe that DOD should use more commercial products because, in many instances, they cost less and their quality is comparable to products built according to DOD military specifications. Many such reform proposals are based on recognition that DOD regulatory barriers and a Cold War acquisition “culture” have inhibited the introduction of commercial products.
Date:
March 4, 2003
Creator:
Grasso, Valerie Bailey
Object Type:
Report
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 106, No. 20, Ed. 1 Tuesday, March 4, 2003
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2003
Creator:
Griffin, Joanie
Object Type:
Newspaper
System:
The Portal to Texas History
The Sealy News (Sealy, Tex.), Vol. 118, No. 18, Ed. 1 Friday, March 4, 2005
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2005
Creator:
Griffin, Joanie & Horecka, Bobby
Object Type:
Newspaper
System:
The Portal to Texas History
Channel Guided Standard LWFA (CGSL) Project
During the project we have demonstrated control of several important parameters of capillary channels. We achieved the required profiles for guiding, we have demonstrated channels in density range between 10{sup 17}-10{sup 19}cm{sup -3} in both short and long capillaries. The plasma temperature and density profiles were measured in both radial and longitudinal directions. The Boron Nitride capillary has provided a guiding medium that can withstand more than 1000 shots. The laser ignition of capillary discharge provided reliable almost jitter free approach. Both laser and experimental set up were upgraded. The laser system upgrade included development of a 10 TW Ti-sapphire laser facility that will be used for acceleration experiments instead T cube. We have conducted high intensity (above 10{sup 17}W/cm{sup 2}) guiding experiments through various capillaries. The concerns related to influence of relatively high current density flow through capillary on the injected electrons were studied extensively by us both theoretically and experimentally using a simple injection method. The method is based on the interaction of a high intensity laser pulse with a thin wire placed near capillary entrance. The influence of magnetic fields was found to be insignificant. Using this method we have studied transport of electrons though capillary discharge. …
Date:
March 4, 2006
Creator:
Hafizi, B. & Zigler, A.
Object Type:
Report
System:
The UNT Digital Library
Federal Agency Emergency Preparedness and Dismissal of Employees
None
Date:
March 4, 2003
Creator:
Halchin, L. Elaine
Object Type:
Report
System:
The UNT Digital Library
West Hackberry Tertiary Project, Class I
The West Hackberry Tertiary Project is a field test of the concept that air injection can generate tertiary oil recovery through the Double Displacement Process. The Double Displacement Process is the gas displacement of a water invaded oil column for the purpose of recovering tertiary oil through gravity drainage. The novel aspect of this project is the use of air as the injection fluid. In Gulf Coast oil reservoirs with pronounced bed dip, reservoir performance has shown that gravity drainage recoveries average 80% to 90% of the original oil in place while water drive recoveries average 50% to 60% of the original oil in place. The target for tertiary oil recovery with the Double Displacement Process is the incremental oil between the 50% to 60% water drive recoveries and the 80% to 90% gravity drainage recoveries.
Date:
March 4, 2002
Creator:
Haley, Kenneth A.; Gillham, Travis H. & Yannimaras, Demetrios
Object Type:
Report
System:
The UNT Digital Library
Science & Technology Review April 2005
This months issue has the following articles: (1) Addressing National Security Needs Benefits Energy and Environment--Commentary by Jane C. S. Long; (2) Monitoring Earth's Subsurface from Space--Livermore scientists are using radar images and simulations Livermore scientists are using radar images and simulations to detect subsurface changes on Earth of less than 1 centimeter; (3) Faculty on Sabbatical Find a Good Home at Livermore--Since 2000, more than 20 faculty members from around the world have come to the Laboratory as sabbatical scholars; (4) Finding Genes by Leaps and Bounds--Livermore biologists use computational analysis and laboratory frogs to identify functional elements of the human genome; and (5) Into the Wide Blue Yonder with BlueGene/L--BlueGene/L is the world's fastest supercomputer, and it embodies an entirely new class of highly scalable platform.
Date:
March 4, 2005
Creator:
Henson, V E
Object Type:
Report
System:
The UNT Digital Library