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Degree Department
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Year
Month
Day
Magnetic Fields in Population III Star Formation
We study the buildup of magnetic fields during the formation of Population III star-forming regions, by conducting cosmological simulations from realistic initial conditions and varying the Jeans resolution. To investigate this in detail, we start simulations from identical initial conditions, mandating 16, 32 and 64 zones per Jeans length, and studied the variation in their magnetic field amplification. We find that, while compression results in some amplification, turbulent velocity fluctuations driven by the collapse can further amplify an initially weak seed field via dynamo action, provided there is sufficient numerical resolution to capture vortical motions (we find this requirement to be 64 zones per Jeans length, slightly larger than, but consistent with previous work run with more idealized collapse scenarios). We explore saturation of amplification of the magnetic field, which could potentially become dynamically important in subsequent, fully-resolved calculations. We have also identified a relatively surprising phenomena that is purely hydrodynamic: the higher-resolved simulations possess substantially different characteristics, including higher infall-velocity, increased temperatures inside 1000 AU, and decreased molecular hydrogen content in the innermost region. Furthermore, we find that disk formation is suppressed in higher-resolution calculations, at least at the times that we can follow the calculation. We discuss the …
Date:
February 22, 2012
Creator:
Turk, Matthew J.; Oishi, Jeffrey S.; Abel, Tom & Bryan, Greg
Object Type:
Article
System:
The UNT Digital Library
Study of charmonium resonances in the gg -> K0SK pi- and gg -> K K-pi pi-pi0 processes
This thesis reports the analysis of the e{sup +}e{sup -} {yields} e{sup +}e{sup -}K{sub S}{sup 0}K{sup {+-}}{pi}{sup {-+}} and e{sup +}e{sup -} {yields} e{sup +}e{sup -}K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} processes using the final dataset of the BABAR experiment located at the SLAC National Accelerator Laboratory. From previous measurements, the K{sub S}{sup 0}K{sup {+-}}{pi}{sup {-+}} final state is known to show a clear signal from the {eta}{sub c}(2S) particle. This c{bar c} state escaped detection for almost twenty years and its properties are still not well established on the experimental ground, while accurate predictions exist on the theoretical side. The e{sup +}e{sup -} {yields} e{sup +}e{sup -}K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} process is first studied in this thesis. An accurate determination of the {eta}{sub c}(2S) properties is obtained in the K{sub S}{sup 0}K{sup {+-}}{pi}{sup {-+}} decay mode. We also report the first observation of {eta}{sub c}(2S) and other charmonium states to the K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} final state. The results of this thesis have been published in Physical Review D, and will be useful to test theoretical models describing the charmonium system. The thesis is organized in four chapters. The first one gives a brief introduction …
Date:
February 22, 2012
Creator:
Biassoni, Pietro & /U. Milan, Dept. Phys.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Plot/SurfW: Plotting Utility for EDGE2D Output
This report describes a utility that was developed to display EDGE2D results. The utility is focused on results that relate to impurity density, velocity, and particle fluxes in the SOL and divertor. Due to the complicated nature of 2D impurity sources, the concentration of the thermal force near the separatrix and near the divertor entrance, the impurity flow pattern and impurity densities are not necessarily easy to visualize. Thus, we wanted a utility that allowed simple and quick visualization of the impurity behavior. In order to achieve this we overlaid the divertor hardware for plots inside the divertor and we expanded the appearance of the main chamber SOL by plotting distance along the field lines vs. SOL depth with the density (or velocity or flux or other quantity) the false colour. Also, we allowed for the plotted variable to be a function of the other EDGE2D result variables. __________________________________________________
Date:
June 22, 2012
Creator:
Strachan, W.M. Davis and J.D.
Object Type:
Report
System:
The UNT Digital Library
Photon Strength and the Low-Energy Enhancement
The ability of atomic nuclei to emit and absorb photons with energy E{sub {gamma}} is known as the photon strength function f(E{sub {gamma}}). It has direct relevance to astrophysical element formation via neutron capture processes due to its central role in nuclear reactions. Studies of f(E{sub {gamma}}) have benefited from a wealth of data collected in neutron capture and direct reactions but also from newly commissioned inelastic photon scattering facilities. The majority of these experimental methods, however, rely on the use of models because measured {gamma}-ray spectra are simultaneously sensitive to both the nuclear level density and f(E{sub {gamma}}). As excitation energy increases towards the particle separation energies, the level density increases rapidly, creating the quasi-continuum. Nuclear properties in this excitation energy region are best characterized using statistical quantities, such as f(E{sub {gamma}}). A point of contention in studies of the quasi-continuum has been an unexpected and unexplained increase in f(E{sub {gamma}}) at low {gamma}-ray energies (i.e. below E{sub {gamma}} {approx}3 MeV) in a subset of light-to-medium mass nuclei. Ideally, a new model-independent experimental technique is required to address questions regarding the existence and origin of this low-energy enhancement in f(E{sub {gamma}}). Here such a model-independent approach is presented for …
Date:
February 22, 2012
Creator:
Wiedeking, M; Bernstein, L A; Krticka, M; Bleuel, D L; Allmond, J M; Basunia, M S et al.
Object Type:
Article
System:
The UNT Digital Library
Reach the Bottom Line of the Sbottom Search
We propose a new search strategy for directly-produced sbottoms at the LHC with a small mass splitting between the sbottom and its decayed stable neutralino. Our search strategy is based on boosting sbottoms through an energetic initial state radiation jet. In the final state, we require a large missing transverse energy and one or two b-jets besides the initial state radiation jet. We also define a few kinematic variables to further increase the discovery reach. For the case that the sbottom mainly decays into the bottom quark and the stable neutralino, we have found that even for a mass splitting as small as 10 GeV sbottoms with masses up to around 400 GeV can be excluded at the 95% confidence level with 20 inverse femtobarn data at the 8 TeV LHC.
Date:
May 22, 2012
Creator:
Alvarez, Ezequiel & Bai, Yang
Object Type:
Article
System:
The UNT Digital Library
X-Band RF Gun Development
In support of the MEGa-ray program at LLNL and the High Gradient research program at SLAC, a new X-band multi-cell RF gun is being developed. This gun, similar to earlier guns developed at SLAC for Compton X-ray source program, will be a standing wave structure made of 5.5 cells operating in the pi mode with copper cathode. This gun was designed following criteria used to build SLAC X-band high gradient accelerating structures. It is anticipated that this gun will operate with surface electric fields on the cathode of 200 MeV/m with low breakdown rate. RF will be coupled into the structure through a final cell with symmetric duel feeds and with a shape optimized to minimize quadrupole field components. In addition, geometry changes to the original gun, operated with Compton X-ray source, will include a wider RF mode separation, reduced surface electric and magnetic fields.
Date:
June 22, 2012
Creator:
Vlieks, Arnold; Dolgashev, Valery; Tantawi, Sami; Anderson, Scott; Hartemann, Fred & Marsh, Roark
Object Type:
Article
System:
The UNT Digital Library
A Green Prison: The Santa Rita Jail Campus Microgrid
A large microgrid project is nearing completion at Alameda County’s twenty-two-year-old 45 ha 4,000-inmate Santa Rita Jail, about 70 km east of San Francisco. Often described as a green prison, it has a considerable installed base of distributed energy resources (DER) including an eight-year old 1.2 MW PV array, a five-year old 1 MW fuel cell with heat recovery, and considerable efficiency investments. A current US$14 M expansion adds a 2 MW-4 MWh Li-ion battery, a static disconnect switch, and various controls upgrades. During grid blackouts, or when conditions favor it, the Jail can now disconnect from the grid and operate as an island, using the on-site resources described together with its back-up diesel generators. In other words, the Santa Rita Jail is a true microgrid, or μgrid, because it fills both requirements, i.e. it is a locally controlled system, and it can operate both grid connected and islanded. The battery’s electronics includes Consortium for Electric Reliability Technology (CERTS) Microgrid technology. This enables the battery to maintain energy balance using droops without need for a fast control system.
Date:
January 22, 2012
Creator:
Marnay, Chris; DeForest, Nicholas & Lai, Judy
Object Type:
Article
System:
The UNT Digital Library
Components of the dilepton continuum in Pb+Pb collisions at sqrt s = 2.76 TeV
None
Date:
February 22, 2012
Creator:
Vogt, R; Shukla, P & Kumar, V
Object Type:
Article
System:
The UNT Digital Library
Nuclear PDFs
N/A
Date:
October 22, 2012
Creator:
D., De Florian; M., Stratmann; Zurita, P. & Sassot, R.
Object Type:
Article
System:
The UNT Digital Library
LAB-SCALE DEMONSTRATION OF PLUTONIUM PURIFICATION BY ANION EXCHANGE, PLUTONIUM (IV) OXALATE PRECIPITATION, AND CALCINATION TO PLUTONIUM OXIDE TO SUPPORT THE MOX FEED MISSION
H-Canyon and HB-Line are tasked with the production of PuO{sub 2} from a feed of plutonium metal. The PuO{sub 2} will provide feed material for the MOX Fuel Fabrication Facility. After dissolution of the Pu metal in H-Canyon, the solution will be transferred to HB-Line for purification by anion exchange. Subsequent unit operations include Pu(IV) oxalate precipitation, filtration and calcination to form PuO{sub 2}. This report details the results from SRNL anion exchange, precipitation, filtration, calcination, and characterization tests, as requested by HB-Line1 and described in the task plan. This study involved an 80-g batch of Pu and employed test conditions prototypical of HB-Line conditions, wherever feasible. In addition, this study integrated lessons learned from earlier anion exchange and precipitation and calcination studies. H-Area Engineering selected direct strike Pu(IV) oxalate precipitation to produce a more dense PuO{sub 2} product than expected from Pu(III) oxalate precipitation. One benefit of the Pu(IV) approach is that it eliminates the need for reduction by ascorbic acid. The proposed HB-Line precipitation process involves a digestion time of 5 minutes after the time (44 min) required for oxalic acid addition. These were the conditions during HB-line production of neptunium oxide (NpO{sub 2}). In addition, a series …
Date:
August 22, 2012
Creator:
Crowder, M. & Pierce, R.
Object Type:
Report
System:
The UNT Digital Library
Technical Note - PMâ‚‚â‚… Continuous Monitor Comparability Assessment
This tool provides a one-page technical report that assesses the comparability of a PMâ‚‚â‚… continuous monitor when collocated with an FRM Sampler.
Date:
February 22, 2012
Creator:
United States. Environmental Protection Agency.
Object Type:
Report
System:
The UNT Digital Library
Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 238, Ed. 1 Monday, October 22, 2012
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
October 22, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 106, No. 15, Ed. 1 Thursday, November 22, 2012
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
November 22, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 105, No. 32, Ed. 1 Thursday, March 22, 2012
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
March 22, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 265, Ed. 1 Thursday, November 22, 2012
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
November 22, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Olney Enterprise (Olney, Tex.), Vol. 104, No. 38, Ed. 1 Thursday, November 22, 2012
Weekly newspaper from Olney, Texas that includes local, state, and national news along with advertising.
Date:
November 22, 2012
Creator:
Kimbro, Mindi
Object Type:
Newspaper
System:
The Portal to Texas History
[Email from David Taffet to Jack Evans, January 22, 2012]
Email from David Taffet to Jack Evans discussing another email regarding investments in the Dallas Way's projects.
Date:
January 22, 2012
Creator:
Taffet, David
Object Type:
Letter
System:
The UNT Digital Library
Yoakum Herald-Times (Yoakum, Tex.), Vol. 120, No. 8, Ed. 1 Wednesday, February 22, 2012
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
February 22, 2012
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 120, No. 34, Ed. 1 Wednesday, August 22, 2012
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
August 22, 2012
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 123, No. 22, Ed. 1 Thursday, November 22, 2012
Weekly newspaper from De Leon, Texas that includes local, state and national news along with advertising.
Date:
November 22, 2012
Creator:
Kestner, Laura
Object Type:
Newspaper
System:
The Portal to Texas History
Jackson County Herald-Tribune (Edna, Tex.), Vol. 105, No. 39, Ed. 1 Wednesday, August 22, 2012
Weekly newspaper from Edna, Texas that includes local, state, and national news along with advertising.
Date:
August 22, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ennis Daily News (Ennis, Tex.), Ed. 1 Thursday, March 22, 2012
Daily newspaper from Ennis, Texas that includes local, state and national news along with advertising.
Date:
March 22, 2012
Creator:
Todaro, Nick
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 112, No. 294, Ed. 1 Saturday, September 22, 2012
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
September 22, 2012
Creator:
Deason, Gene
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 112, No. 188, Ed. 1 Tuesday, May 22, 2012
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
May 22, 2012
Creator:
Deason, Gene
Object Type:
Newspaper
System:
The Portal to Texas History