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Office of Scientific & Technical Information Technical Reports
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Day
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An Overview of the Administration's Strengthening America's Communities Initiative
None
Date:
February 27, 2006
Creator:
Boyd, Eugene; Mulock, Bruce K.; Smale, Pauline; Cowan, Tadlock; Laney, Garrine P. & Foote, Bruce E.
Object Type:
Report
System:
The UNT Digital Library
Performance of GAASP/GAAS Superlattice Photocathodes in High Energy Experiments using Polarized Electrons
The GaAsP/GaAs strained superlattice photocathode structure has proven to be a significant advance for polarized electron sources operating with high peak currents per microbunch and relatively low duty factor. This is the characteristic type of operation for SLAC and is also planned for the ILC. This superlattice structure was studied at SLAC [1], and an optimum variation was chosen for the final stage of E-158, a high-energy parity violating experiment at SLAC. Following E-158, the polarized source was maintained on standby with the cathode being re-cesiated about once a week while a thermionic gun, which is installed in parallel with the polarized gun, supplied the linac electron beams. However, in the summer of 2005, while the thermionic gun was disabled, the polarized electron source was again used to provide electron beams for the linac. The performance of the photocathode 24 months after its only activation is described and factors making this possible are discussed.
Date:
February 27, 2006
Creator:
Brachmann, A.; Clendenin, J. E.; Maruyama, T.; Garwin, E. L.; Ioakemidi, K.; Prescott, C. Y. et al.
Object Type:
Article
System:
The UNT Digital Library
Strong and Weak Lensing United III: Measuring the Mass Distribution of the Merging Galaxy Cluster 1E0657-56
The galaxy cluster 1E0657-56 (z = 0.296) is remarkably well-suited for addressing outstanding issues in both galaxy evolution and fundamental physics. We present a reconstruction of the mass distribution from both strong and weak gravitational lensing data. Multi-color, high-resolution HST ACS images allow detection of many more arc candidates than were previously known, especially around the subcluster. Using the known redshift of one of the multiply imaged systems, we determine the remaining source redshifts using the predictive power of the strong lens model. Combining this information with shape measurements of ''weakly'' lensed sources, we derive a high-resolution, absolutely-calibrated mass map, using no assumptions regarding the physical properties of the underlying cluster potential. This map provides the best available quantification of the total mass of the central part of the cluster. We also confirm the result from Clowe et al. (2004, 2006a) that the total mass does not trace the baryonic mass.
Date:
September 27, 2006
Creator:
Bradac, Marusa; Clowe, Douglas; Gonzalez, Anthony H.; Marshall, Phil; Forman, William; Jones, Christine et al.
Object Type:
Article
System:
The UNT Digital Library
Asymptotic Analysis of Time-Dependent Neutron Transport Coupled with Isotopic Depletion and Radioactive Decay
We describe an asymptotic analysis of the coupled nonlinear system of equations describing time-dependent three-dimensional monoenergetic neutron transport and isotopic depletion and radioactive decay. The classic asymptotic diffusion scaling of Larsen and Keller [1], along with a consistent small scaling of the terms describing the radioactive decay of isotopes, is applied to this coupled nonlinear system of equations in a medium of specified initial isotopic composition. The analysis demonstrates that to leading order the neutron transport equation limits to the standard time-dependent neutron diffusion equation with macroscopic cross sections whose number densities are determined by the standard system of ordinary differential equations, the so-called Bateman equations, describing the temporal evolution of the nuclide number densities.
Date:
September 27, 2006
Creator:
Brantley, P S
Object Type:
Article
System:
The UNT Digital Library
Final Report on project Photoinduced Dipoles and Charge Pairs in Condensed Media
Most of our work involves photogenerated donor (D+) and acceptor (A-) radical ion pairs and their escape and recombination. The geminate radical ions are produced by inter or intramolecular electron transfer quenching of photoexcited acceptors. We made great progress in understanding the effect of charge separation distance and other factors on free ion formation. For geminate radical ion pairs formed by intermolecular electron transfer quenching, we found that, at least in a medium polarity solvent lilce dichloromethane, free radical ions are mainly formed from solvent separated radical ion pairs (SSRIPs). Contact radical ion pairs (CRIPs) make a very small contribution to free radical ion formation. It is observed that CRIPs and SSRIPs are kinetically distinguishable species. There is a potential barrier between CRIPs and SSRIPs that prevents a fast equilibrium between the two during the recombination of radical ion pairs and free radical ion formation. We confirmed for the first time that, for the recombination of both CRIPs and SSRIPs that are in the Marcus inverted region, rate constants of SSRIPs are larger than those of CRIPs. Our study indicates that initial charge separation distance and the potential barrier between CRIPs and SSRIPs play a more important role than recombination …
Date:
September 27, 2006
Creator:
Braun, Charles L.
Object Type:
Report
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 112, No. 12, Ed. 1 Wednesday, September 27, 2006
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 27, 2006
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 112, No. 25, Ed. 1 Wednesday, December 27, 2006
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 27, 2006
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
[Email from Nell Bright, June 27, 2006]
Email from Nell Bright to the WASP board concerning an unnamed member's opposition to hiring an Executive Director.
Date:
June 27, 2006
Creator:
Bright, Nell
Object Type:
Letter
System:
The Portal to Texas History
Do grain boundaries in nanophase metals slide?
Nanophase metallic materials show a maximum in strength as grain size decreases to the nano scale, indicating a break down of the Hall-Petch relation. Grain boundary sliding, as a possible accommodation mechanisms, is often the picture that explain computer simulations results and real experiments. In a recent paper, Bringa et al. Science 309, 1838 (2005), we report on the observation of an ultra-hard behavior in nanophase Cu under shock loading, explained in terms of a reduction of grain boundary sliding under the influence of the shock pressure. In this work we perform a detailed study of the effects of hydrostatic pressure on nanophase Cu plasticity and find that it can be understood in terms of pressure dependent grain boundary sliding controlled by a Mohr-Coulomb law.
Date:
October 27, 2006
Creator:
Bringa, E M; Leveugle, E & Caro, A
Object Type:
Article
System:
The UNT Digital Library
The Rice Thresher, Vol. 94, No. 9, Ed. 1 Friday, October 27, 2006
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
October 27, 2006
Creator:
Brown, David
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from Eleanor Brown to Elaine Harmon, May 27, 2006]
Letter from Eleanor Brown to Elaine Harmon discussing her hobbies, her husband's health, and other news. A handwritten note at the top of the page states, "Response to Elaine Harmon for class news for WASP Newsletter. Sent May 27, 2006."
Date:
May 27, 2006
Creator:
Brown, Eleanor McLernon
Object Type:
Letter
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 113, No. 19, Ed. 1 Friday, January 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 83, Ed. 1 Thursday, April 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 105, Ed. 1 Saturday, May 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 125, Ed. 1 Tuesday, June 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 146, Ed. 1 Thursday, July 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 193, Ed. 1 Wednesday, September 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 214, Ed. 1 Friday, October 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 114, No. 250, Ed. 1 Wednesday, December 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Canadian Record (Canadian, Tex.), Vol. 116, No. 17, Ed. 1 Thursday, April 27, 2006
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
April 27, 2006
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 116, No. 30, Ed. 1 Thursday, July 27, 2006
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
July 27, 2006
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Law of the Sea Convention and U.S. Policy
This report provides an overview of the law of the sea convention and U.S. policy.
Date:
January 27, 2006
Creator:
Browne, Marjorie Ann
Object Type:
Report
System:
The UNT Digital Library
Fishery, Aquaculture, and Marine Mammal Legislation in the 109th Congress
This report replaces CRS Issue Brief IB10139, Fishery, Aquaculture, and Marine MAmmal Legislation in the 109th Congress.
Date:
October 27, 2006
Creator:
Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library
The Endangered Species Act (ESA) in the 109th Congress: Conflicting Values and Difficult Choices
This report identifies additional bills that have been introduced in the 109th Congress to address specific concerns related to how the Endangered Species Act (ESA is implemented and how endangered species are managed, and will be updated periodically to reflect legislative action.
Date:
October 27, 2006
Creator:
Buck, Eugene H.; Corn, M. Lynne; Sheikh, Pervaze A. & Meltz, Robert
Object Type:
Report
System:
The UNT Digital Library