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482 Matching Results
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Lake Hefner
Photograph of a wind surfing scene on Lake Hefner.
Date:
March 21, 2001
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Production and Decay of Omega_c^0
We present an analysis of inclusive {Omega}{sub c}{sup 0} baryon production and decays in 230.5 fb{sup -1} of data recorded with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at the Stanford Linear Accelerator Center. {Omega}{sub c}{sup 0} baryons are reconstructed in four final states ({Omega}{sup -}{pi}{sup +}, {Omega}{sup -}{pi}{sup +}{pi}{sup 0}, {Omega}{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}, {Xi}{sup -}K{sup -}{pi}{sup +}{pi}{sup +}) and the ratios of branching fractions for these final states are measured. We also measure the momentum spectrum of the {Omega}{sub c}{sup 0} baryons in the e{sup +}e{sup -} center-of-mass frame. From the spectrum, they observe {Omega}{sub c}{sup 0} production from B decays and in c{bar c} events, and extract the two rates of production.
Date:
March 21, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Distortion Correction for the Many Beam Fabry Perot Velocimeter
Graphical curves and text tables are presented that map out time and space distortions for data obtained from film records of the Many Beam Fabry Perot Velocimeter. Effective distortion corrections extracted from these mappings can be applied to upcoming velocimetry experiments, but only with limited success over periods of a year or more into the future. A method of using three fiducials to provide fresh time and space distortion data on each film record is presented as a more reliable procedure to correct distortions to an acceptable level of accuracy.
Date:
March 21, 2001
Creator:
Avara, G.; Collins, L. & Rivera, A.
Object Type:
Report
System:
The UNT Digital Library
Using Perturbed QR Factorizations To Solve Linear Least-Squares Problems
We propose and analyze a new tool to help solve sparse linear least-squares problems min{sub x} {parallel}Ax-b{parallel}{sub 2}. Our method is based on a sparse QR factorization of a low-rank perturbation {cflx A} of A. More precisely, we show that the R factor of {cflx A} is an effective preconditioner for the least-squares problem min{sub x} {parallel}Ax-b{parallel}{sub 2}, when solved using LSQR. We propose applications for the new technique. When A is rank deficient we can add rows to ensure that the preconditioner is well-conditioned without column pivoting. When A is sparse except for a few dense rows we can drop these dense rows from A to obtain {cflx A}. Another application is solving an updated or downdated problem. If R is a good preconditioner for the original problem A, it is a good preconditioner for the updated/downdated problem {cflx A}. We can also solve what-if scenarios, where we want to find the solution if a column of the original matrix is changed/removed. We present a spectral theory that analyzes the generalized spectrum of the pencil (A*A,R*R) and analyze the applications.
Date:
March 21, 2008
Creator:
Avron, Haim; Ng, Esmond G. & Toledo, Sivan
Object Type:
Article
System:
The UNT Digital Library
Accessing the Inaccessible: The Case for Opening up Russia's Closed Cities
The selling of weapons-related nuclear knowledge by Russian scientists for economic gain constitutes a threat to US national security. Some estimate that the number of Russian scientists seeking permanent employment abroad constitute five to ten percent of all researchers who have left the field of science. And, there is concern that those who have left are ''the better minds.'' Moreover, the issue of brain drain concerns not only those who move abroad permanently, but those who still reside in Russia and travel abroad to sell their knowledge. Of particular concern to the US is the potential sale of WMD knowledge by some. To ''mitigate the risk that economic difficulties...might create the temptation for individuals or institutes to sell expertise to countries of proliferation concern and terrorist organizations,'' the Department of Energy launched a Nuclear Cities Initiative (NCI) in 1998 with the goal of creating commercial jobs and economic diversification in the ten closed cities that form the core of Russia's nuclear weapons complex to accommodate the loss of employment in the nuclear weapons industry. However, unless Russia opens access to the areas of its closed cities that are, or could become, involved in commercial activities-while of course carefully controlling access …
Date:
March 21, 2001
Creator:
Ball, D Y
Object Type:
Article
System:
The UNT Digital Library
The State Children's Health Insurance Program: Eligibility, Enrollment, and Program Funding
None
Date:
March 21, 2001
Creator:
Baumrucker, Evelyne P.
Object Type:
Report
System:
The UNT Digital Library
BSE (“Mad Cow Disease”): A Brief Overview
This report provides background on appearance of BSE(bovine spongiform encephalopathy or "mad cow disease") in North America.
Date:
March 21, 2006
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Nonproliferation Issues
None
Date:
March 21, 2003
Creator:
Behrens, Carl E.
Object Type:
Report
System:
The UNT Digital Library
Bounds on Transport Coefficients of Porous Media
An analytical formulation of conductivity bounds by Bergman and Milton is used in a different way to obtain rigorous bounds on the real transport coefficients (electrical conductivity, thermal conductivity, and/or fluid permeability) of a fluid-saturated porous medium. These bounds do not depend explicitly on the porosity, but rather on two formation factors--one associated with the pore space and the other with the solid frame. Hashin-Shtrikman bounds for transport in random polycrystals of porous-material laminates will also be discussed.
Date:
March 21, 2005
Creator:
Berger, E. L.
Object Type:
Article
System:
The UNT Digital Library
Top spin and experimental tests
The authors examine pair mass dependence near threshold as a means to measure the spin of the top quark in hadron collisions, and they discuss the possibility that a top quark signal could be hidden among the top events.
Date:
March 21, 2000
Creator:
Berger, E. L. & Tait, T. M. P.
Object Type:
Article
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 26, No. 7, Ed. 1 Wednesday, March 21, 2007
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
March 21, 2007
Creator:
Bick, Jack & Crimmins, Blaine
Object Type:
Newspaper
System:
The Portal to Texas History
The Harper Herald (Harper, Tex.), Vol. 70, No. 12, Ed. 1 Tuesday, March 21, 2000
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
March 21, 2000
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
Partial Acceptance for Beneficial Use (ABU) for the Type 4 In Situ Vapor Sampler (ISVS) Carts
This document provides the ''Partial'' Acceptance for Beneficial Use (ABU), for the Type 4 in-situ vapor sampler system (ISVS). This document is generated to support the completion of equipment modifications and engineering documentation for the ISVS system that is used for sampling gaseous vapors in the Hanford single shell radioactive waste storage tanks. The ABU is used to document the items required for transferring the ISVS system to operations for field use. This document is generated following Characterization Engineering Desk Instruction DI-CE-004-001.
Date:
March 21, 2000
Creator:
Boger, R. M.
Object Type:
Report
System:
The UNT Digital Library
Air Force FB-22 Bomber Concept
The Air Force has expressed interest in developing a bomber variant of the F-22A Raptor to "bridge the gap" between today's bombers and a follow-on bomber in 2037. Questions exist regarding the FB-22's feasibility, cost, and combat potential.
Date:
March 21, 2005
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library
F-22 Aircraft Program
This report discusses the background information, analysis and the recent developments in the F-22 Aircraft Program. The F-22 program raises questions about its cost and the need for this aircraft, the capabilities it would have, and the number of these planes needed to meet military requirements. The F-22 has had strong congressional support, although some have criticized the program on grounds of cost, requirements, and coordination with other tactical aircraft programs. Deletion of procurement funds in the FY2000 defense appropriation bill passed by the House made the future of the program a major issue for House and Senate conferees in 1999.
Date:
March 21, 2000
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library
F-22 Raptor Aircraft Program
None
Date:
March 21, 2002
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library
Nanosecond Ultrasonics to Study Phase Transitions in Solid and Liquid Systems at High Pressure and Temperature
This report describes the development of a high-frequency ultrasonic measurement capability for application to the study of phase transitions at elevated pressure and temperature. We combined expertise in various aspects of static high-pressure technique with recent advances in wave propagation modeling, ultrasonic transducer development, electronic methods and broadband instrumentation to accomplish the goals of this project. The transduction and electronic systems have a demonstrated bandwidth of 400 MHz, allowing investigations of phenomena with characteristic times as short as 2.5 nS. A compact, pneumatically driven moissanite anvil cell was developed and constructed for this project. This device generates a high-pressure environment for mm dimension samples to pressures of 3 GPa. Ultrasonic measurements were conducted in the moissanite cell, an LLNL multi-anvil device and in a modified piston cylinder device. Measurements for water, and elemental tantalum, tin and cerium demonstrate the success of the methods. The {gamma}-{alpha} phase transition in cerium was clearly detected at {approx}0.7 GPa with 75 MHz longitudinal waves. These results have direct application to important problems in LLNL programs, as well as seismology and planetary science.
Date:
March 21, 2007
Creator:
Bonner, B P; Berge, P A; Carlson, S C; Farber, D L & Akella, J
Object Type:
Report
System:
The UNT Digital Library
2006 Sensory Transduction in Microorganisms Gordon Conference - January 22-27
This Report is Description of Sensory Transduction in Microorganisms at Gordon Conference.
Date:
March 21, 2007
Creator:
Borkovich, Katherine
Object Type:
Article
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 107, No. 35, Ed. 1 Thursday, March 21, 2002
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 21, 2002
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 112, No. 36, Ed. 1 Wednesday, March 21, 2007
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 21, 2007
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 88, No. 138, Ed. 1 Friday, March 21, 2003
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 21, 2003
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 89, No. 158, Ed. 1 Sunday, March 21, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 21, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 163, Ed. 1 Monday, March 21, 2005
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 21, 2005
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 57, Ed. 1 Wednesday, March 21, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 21, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History