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452 Matching Results
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Laboratory observation of secondary shock formation ahead of a strongly radiative blast wave
High Mach number blast waves were created by focusing a laser pulse on a solid pin, surrounded by nitrogen or xenon gas. In xenon, the initial shock is strongly radiative, sending out a supersonic radiative heat wave far ahead of itself. The shock propagates into the heated gas, diminishing in strength as it goes. The radiative heat wave also slows, and when its Mach number drops to 2 with respect to the downstream plasma, the heat wave drives a second shock ahead of itself to satisfy mass and momentum conservation in the heat wave reference frame; the heat wave becomes subsonic behind the second shock. For some time both shocks are observed simultaneously. Eventually the initial shock dimimishes in strength so much that it can longer be observed, but the second shock continues to propagate long after this time. This sequence of events is a new phenomenon that has not previously been discussed in literature. Numerical simulation clarifies the origin of the second shock, and its position is consistent with an analytical estimate.
Date:
November 16, 2005
Creator:
Hansen, J. F.; Edwards, M. J.; Froula, D. H.; Gregori, G.; Edens, A. & Ditmire, T.
Object Type:
Article
System:
The UNT Digital Library
Magnetohydrodynamic Particle Acceleration Processes: SSX Experiments, Theory, and Astrophysical Applications
Project Title: Magnetohydrodynamic Particle Acceleration Processes: SSX Experiments, Theory, and Astrophysical Applications PI: Michael R. Brown, Swarthmore College The purpose of the project was to provide theoretical and modeling support to the Swarthmore Spheromak Experiment (SSX). Accordingly, the theoretical effort was tightly integrated into the SSX experimental effort. During the grant period, Michael Brown and his experimental collaborators at Swarthmore, with assistance from W. Matthaeus as appropriate, made substantial progress in understanding the physics SSX plasmas.
Date:
November 16, 2006
Creator:
Brown, Michael R.
Object Type:
Report
System:
The UNT Digital Library
Final report on Grant DE-FG03-01ER63234
Current data suggests that radiation-induced bystander effects (RIBE) are associated with release of active polypeptide factors into the extra-cellular medium. Proteolytic processing of membrane-anchored cytokines (shedding) is a generic cellular response to environmental stress; hence, it is likely that RIBE are part of a general mechanism by which cells alert their neighbors to potential harm by exchange of autocrine and paracrine factors. In radiation biology, we lack a general understanding of the relative importance of shed factors in the overall response of tissues to energy absorbed from a radiation field. This project helped fill that knowledge gap by investigating (1) the production of soluble factors by cells traversed by ionizing particles, (2) transport of soluble factors through the extra-cellular medium, and (3) signaling processes initiate by capture of soluble factors on cell-surface receptors.
Date:
November 16, 2006
Creator:
Miller, John H.
Object Type:
Report
System:
The UNT Digital Library
Sequential Monte-Carlo Based Framework for Dynamic Data-Driven Event Reconstruction for Atmospheric Release
Atmospheric releases of hazardous materials are highly effective means to impact large populations. We propose an atmospheric event reconstruction framework that couples observed data and predictive computer-intensive dispersion models via Bayesian methodology. Due to the complexity of the model framework, a sampling-based approach is taken for posterior inference that combines Markov chain Monte Carlo (MCMC) and sequential Monte Carlo (SMC) strategies.
Date:
November 16, 2005
Creator:
Johannesson, G; Chow, F K; Glascoe, L; Glaser, R E; Hanley, W G; Kosovic, B et al.
Object Type:
Article
System:
The UNT Digital Library
Molecular Mechanism of Uranium Reduction by Clostridia and Its Manipulation.
This research addresses the need for detailed studies of the enzymatic mechanisms for reduction of radionuclides and/or metals by fermentative microorganisms. The overall objective of this research is to elucidate systematically the molecular mechanisms involved in the reduction of uranium by Clostridia. We propose to (1) determine the role of hydrogenases in uranium reduction, (2) purify the enzymes involved in uranium reduction, (3) determine the mechanisms of reduction, e.g., one or two electron transfer reactions, and (4) elucidate the genetic control of the enzymes and cellular factors involved in uranium reduction. This is a collaborative study between BNL and Stanford University involving expertise in biomolecular science, biochemistry, microbiology, and electrochemistry.
Date:
November 16, 2006
Creator:
Francis, A. J.; Gao, W.; Chidambaram, D. & Dodge, C. J.
Object Type:
Report
System:
The UNT Digital Library
Form CJ-8, Annual Probation Survey: 2004
Blank probation data survey containing a series of questions related to the probationary population in a particular location, with instructions for filling out the survey.
Date:
November 16, 2004
Creator:
United States. Bureau of Justice Statistics.
Object Type:
Text
System:
The UNT Digital Library
Precious Metal Recovery from Fuel Cell MEA's
One of the next-generation power sources is the proton exchange membrane (PEM) fuel cell, which runs on pure hydrogen or hydrogen-rich reformate. At the heart of the PEM fuel cell is a membrane electrode assembly (MEA). The MEA is a laminate composed of electrode layers sandwiched between outer layers, fabricated from either carbon fiber or fabric and which control the diffusion of reactant gases, and the inner polymer mebrane. Hydrogen is oxidized at the anode to form protons, which migrate through the membrane and react with oxygen at the cathode to form water. In this type of fuel cell, platinum catalyzes the reactions at both electrodes. Realization of a future that includes ubiquitous use of hydrogen fuel cell-powered vehicles will be partially contingent on a process for recycling components of the fuel cell membrane electrode assemblies. In aggregate, the platinum used for the fuel cell will represent a large pool of this precious metal, and the efficient recycling of Pt from MEA's will be a cost-enabling factor for success of this technology. Care must be taken in the reclamation process because of the presence of fluoropolymers in the MEA. While Pt is normally recovered with high yield, the combustion process …
Date:
November 16, 2006
Creator:
Shore, Lawrence
Object Type:
Article
System:
The UNT Digital Library
San Antonio Register (San Antonio, Tex.), Vol. 69, No. 22, Ed. 1 Thursday, November 16, 2000
Weekly newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 77, No. 10, Ed. 1 Friday, November 16, 2001
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
November 16, 2001
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
Lexington Observer (Lexington, Okla.), Vol. 11, No. 31, Ed. 1 Thursday, November 16, 2006
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 16, 2006
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Comanche Chief (Comanche, Tex.), No. 28, Ed. 1 Thursday, November 16, 2000
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2000
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 124, No. 92, Ed. 1 Thursday, November 16, 2006
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
November 16, 2006
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 113, No. 46, Ed. 1 Wednesday, November 16, 2005
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Llano News (Llano, Tex.), Vol. 118, No. 7, Ed. 1 Wednesday, November 16, 2005
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2005
Creator:
Stephenson, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 106, No. 45, Ed. 1 Friday, November 16, 2001
Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2001
Creator:
Keys, Scott & Alsobrook, Bruce
Object Type:
Newspaper
System:
The Portal to Texas History
Comanche Chief (Comanche, Tex.), No. 29, Ed. 1 Thursday, November 16, 2006
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2006
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 106, No. 92, Ed. 1 Friday, November 16, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 118, No. 90, Ed. 1 Thursday, November 16, 2000
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
November 16, 2000
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 121, No. 92, Ed. 1 Sunday, November 16, 2003
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
November 16, 2003
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 110, No. 46, Ed. 1 Thursday, November 16, 2000
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
November 16, 2000
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Muon-induced backgrounds in the CUORICINO experiment
To better understand the contribution of cosmic ray muons to the CUORICINO background, ten plastic scintillator detectors were installed at the CUORICINO site and operated during 3 months of the CUORICINO experiment. From these measurements, an upper limit of 0.0021 counts/keV {center_dot} kg {center_dot} yr (95% C.L.) was obtained on the cosmic ray induced background in the neutrinoless double beta decay region of interest. The measurements were compared to Geant4 simulations, which are similar to those that will be used to estimate the backgrounds in CUORE.
Date:
November 16, 2009
Creator:
Andreotti, E.; Arnaboldi, C.; Avignone, F. T.; Balata, M.; Bandac, I.; Barucci, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Breast cancer by proxy: Can the microenvironment be both the cause and consequence?
Breast cancer is one of the most clear-cut examples of a solid tumor in which systemic cues play a decisive part in its development. The breast tissue is constantly subjected to changes in hormone levels and modifications in the microenvironment. This scenario is even more striking during tumor development because of the dramatic loss or aberration of basement membrane (BM) and myoepithelial cells and the gain of peritumoral myofibroblasts. We suggest that the microenvironment, defined here as all components of the mammary gland other than luminal and/or tumor epithelial cells, might be instrumental in maintaining organ integrity and in promoting, and at times even initiating, breast cancer development. As such, the tumor microenvironment and its constituents, alone or in combination, might serve as promising targets for therapy.
Date:
November 16, 2008
Creator:
Ronnov-Jessen, Lone & Bissell, Mina J
Object Type:
Article
System:
The UNT Digital Library
Texas Jewish Post (Fort Worth, Tex.), Vol. 60, No. 46, Ed. 1 Thursday, November 16, 2006
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 16, 2006
Creator:
Wisch, Rene & Wisch-Ray, Sharon
Object Type:
Newspaper
System:
The Portal to Texas History
The Rattler (San Antonio, Tex.), Vol. 93, No. 6, Ed. 1 Wednesday, November 16, 2005
Student newspaper from St. Mary's University in San Antonio, Texas that includes campus news along with advertising.
Date:
November 16, 2005
Creator:
St. Mary's University (San Antonio, Tex.)
Object Type:
Newspaper
System:
The Portal to Texas History