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Astrophysical Radiation Hydrodynamics: The Prospects for Scaling
The general principles of scaling are discussed, followed by a survey of the important dimensionless parameters of fluid dynamics including radiation and magnetic fields, and of non-LTE spectroscopy. The values of the parameters are reviewed for a variety of astronomical and laboratory environments. It is found that parameters involving transport coefficients--the fluid and magnetic Reynolds numbers--have enormous values for the astronomical problems that are not reached in the lab. The parameters that measure the importance of radiation are also scarcely reached in the lab. This also means that the lab environments are much closer to LTE than the majority of astronomical examples. Some of the astronomical environments are more magnetically dominated than anything in the lab. The conclusion is that a good astronomical environment for simulation in a given lab experiment can be found, but that the reverse is much more difficult.
Date:
May 25, 2006
Creator:
Castor, J I
Object Type:
Article
System:
The UNT Digital Library
A Bayesian Analysis of Regularised Source Inversions in Gravitational Lensing
Strong gravitational lens systems with extended sources are of special interest because they provide additional constraints on the models of the lens systems. To use a gravitational lens system for measuring the Hubble constant, one would need to determine the lens potential and the source intensity distribution simultaneously. A linear inversion method to reconstruct a pixellated source distribution of a given lens potential model was introduced by Warren and Dye. In the inversion process, a regularization on the source intensity is often needed to ensure a successful inversion with a faithful resulting source. In this paper, we use Bayesian analysis to determine the optimal regularization constant (strength of regularization) of a given form of regularization and to objectively choose the optimal form of regularization given a selection of regularizations. We consider and compare quantitatively three different forms of regularization previously described in the literature for source inversions in gravitational lensing: zeroth-order, gradient and curvature. We use simulated data with the exact lens potential to demonstrate the method. We find that the preferred form of regularization depends on the nature of the source distribution.
Date:
January 25, 2006
Creator:
Suyu, Sherry H.; Marshall, P. J.; Hobson, M. P. & Blandford, R. D.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 47, Ed. 1 Wednesday, January 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 25, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 78, Ed. 1 Saturday, February 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 25, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 105, Ed. 1 Saturday, March 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 25, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 136, Ed. 1 Tuesday, April 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 25, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 195, Ed. 1 Thursday, May 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 25, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 226, Ed. 1 Sunday, June 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 25, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 246, Ed. 1 Tuesday, July 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 25, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 275, Ed. 1 Friday, August 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 25, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 305, Ed. 1 Monday, September 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 25, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 334, Ed. 1 Wednesday, October 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 25, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 365, Ed. 1 Saturday, November 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 25, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 29, Ed. 1 Monday, December 25, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 25, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Best Angle to Orient Two Intersecting Lines
Fiducials in the form of intersecting straight lines are used to align the target in the final target chamber of the National Ignition Facility of Lawrence Livermore National Laboratory. One of the techniques used to locate these lines is the Hough transform. When two lines intersect at a 90 degree angle, it is tempting to orient the lines to horizontal and vertical directions. There are other possible angles at which the lines may be oriented. One question that arises while designing the fiducials is whether there is a preferred angle or range of angles that leads to higher accuracy. This work attempts to answer this question through detailed computer simulation.
Date:
July 25, 2006
Creator:
Awwal, A. S.; Ferguson, S. W. & Shull, P. B.
Object Type:
Article
System:
The UNT Digital Library
Biofuels Incentives: A Summary of Federal Programs
This report outlines federal programs that provide direct or indirect incentives for biofuels. For each program described, the report provides details including administering agency, authorizing statute(s), annual funding, and expiration date.
Date:
July 25, 2006
Creator:
Yacobucci, Brent D.
Object Type:
Report
System:
The UNT Digital Library
Boerne Star & Recorder (Boerne, Tex.), Vol. 100, No. 33, Ed. 1 Tuesday, April 25, 2006
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 25, 2006
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Boerne Star & Recorder (Boerne, Tex.), Vol. 100, No. 59, Ed. 1 Tuesday, July 25, 2006
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
July 25, 2006
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Boerne Star & Recorder (Boerne, Tex.), Vol. 100, No. 68, Ed. 1 Friday, August 25, 2006
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
August 25, 2006
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Bolivia: Political and Economic Developments and Implications for U.S. Policy
This report includes background information on Bolivia’s political unrest, economic situation, and relations with the United States. In the past few years, Bolivia has experienced extreme political unrest resulting in the country having six presidents since 2001. Under policies of recently-elected leftist-leaning President Evo Morales, Bolivia's relations with neighboring countries, foreign investors, and the United States have been complicated. For some 20 years, U.S. interest in Bolivia has centered on its role as a coca producer and its relationship to Colombia and Peru, the two other major coca- and cocaine-producing countries in the Andes. U.S.-Bolivian relations have become tense in 2006 in the wake of the Morales government's questionable commitment to combating illegal drugs, increasing ties with Venezuela and Cuba, and the nationalization measure.
Date:
January 25, 2006
Creator:
Ribando, Clare & Veillette, Connie
Object Type:
Report
System:
The UNT Digital Library
Bootstrapping One-Loop QCD Amplitudeswith General Helicities
The recently developed on-shell bootstrap for computing one-loop amplitudes in non-supersymmetric theories such as QCD combines the unitarity method with loop-level on-shell recursion. For generic helicity configurations, the recursion relations may involve undetermined contributions from non-standard complex singularities or from large values of the shift parameter. Here we develop a strategy for sidestepping difficulties through use of pairs of recursion relations. To illustrate the strategy, we present sets of recursion relations needed for obtaining n-gluon amplitudes in QCD. We give a recursive solution for the one-loop n-gluon QCD amplitudes with three or four color-adjacent gluons of negative helicity and the remaining ones of positive helicity. We provide an explicit analytic formula for the QCD amplitude A{sub 6;1}(1{sup -}, 2{sup -}, 3{sup -}, 4{sup +}, 5{sup +}, 6{sup +}), as well as numerical results for A{sub 7;1}(1{sup -}, 2{sup -}, 3{sup -}, 4{sup +}, 5{sup +}, 6{sup +}, 7{sup +}), A{sub 8;1}(1{sup -}, 2{sup -}, 3{sup -}, 4{sup +}, 5{sup +}, 6{sup +}, 7{sup +}, 8{sup +}), and A{sub 8;1}(1{sup -}, 2{sup -}, 3{sup -}, 4{sup -}, 5{sup +}, 6{sup +}, 7{sup +}, 8{sup +}). We expect the on-shell bootstrap approach to have widespread applications to phenomenological studies at colliders.
Date:
April 25, 2006
Creator:
Berger, Carola F.; Bern, Zvi; Dixon, Lance J.; Forde, Darren & Kosower, David A.
Object Type:
Report
System:
The UNT Digital Library
Border Security: The Role of the U.S. Border Patrol
This report includes some issues for Congress to consider which could include the slow rate of integration between the USBP’s biometric database of illegal aliens and the Federal Bureau of Investigation’s (FBI) biometric database of criminals and terrorists; the number of unauthorized aliens who die attempting to enter the country each year; the organized human smuggling rings that have proliferated as entering the country has become more difficult; and the threat posed by terrorists along the sparsely defended Northern border as well as the more porous Southwest border.
Date:
January 25, 2006
Creator:
Nuñez-Neto, Blas
Object Type:
Report
System:
The UNT Digital Library
Borehole Geologic Data for the 216-Z Crib Facilities, A Status of Data Assembled through the Hanford Borehole Geologic Information System (HBGIS)
The Pacific Northwest National Laboratory (PNNL) is assembling existing borehole geologic information to aid in determining the distribution and potential movement of contaminants released to the environment and to aid selection of remedial alternatives. This information is being assembled via the Hanford Borehole Geologic Information System (HBGIS), which is being developed as part of the Characterization of Systems Project, managed by PNNL, and the Remediation Decision Support Task of the Groundwater Remediation Project, managed by Fluor Hanford, Inc. The purpose of this particular study was to assemble the existing borehole geologic data pertaining to sediments underlying the 216-Z Crib Facilities and the Plutonium Finishing Plant Closure Zone. The primary objective for Fiscal Year 2006 was to assemble the data, complete log plots, and interpret the location of major geologic contacts for each major borehole in and around the primary disposal facilities that received carbon tetrachloride. To date, 154 boreholes located within or immediately adjacent to 19 of the 216-Z crib facilities have been incorporated into HBGIS. Borehole geologic information for the remaining three Z-crib facilities is either lacking (e.g. 216-Z-13, -14, and -15), or has been identified as a lesser priority to be incorporated at a later date.
Date:
September 25, 2006
Creator:
Last, George V.; Mackley, Rob D. & Lanigan, David C.
Object Type:
Report
System:
The UNT Digital Library
[Both live and on the screen]
Steve Salazar is seen in person and on a screen.
Date:
January 25, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library