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[Tom Rufer and woman at 2008 Emerald Ball]
Photograph of Tom Rufer, Union Director at UNT (right), with a woman (left) at the 2008 Emerald Ball. They are standing side by side, looking at the camera and smiling. An ice sculpture with two large floral arrangements can be seen behind them.
Date:
March 1, 2008
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Tom Stephenson and Rollie Hyde]
Photograph of Tom Stephenson (right), Rollie Hyde (center) and another man identified as "Larry" by his name tag, seated on elongated tables during a visitor speak during the 2006 Texas Daily News Association annual conference held at the Renaissance Worthington Hotel, in Fort Worth, Texas. Other conference attendees are seen seated in the background at similar tables that have water refreshment and jolly rancher candy.
Date:
March 19, 2006
Creator:
Rodriguez, Richard
Object Type:
Photograph
System:
The UNT Digital Library
[Tony Pederson and Donnis Baggett]
Photograph of Tony Pederson, of the Southern Methodist University and Donnis Baggett looking over an award together during the 2004 Texas Daily News Association annual conference held in Corpus Christi.
Date:
March 22, 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Tony Pederson and Donnis Baggett, 2]
Photograph of Tony Pederson, of the Southern Methodist University and Donnis Baggett looking over a Longhorn award together during the 2004 Texas Daily News Association annual conference held in Corpus Christi.
Date:
March 22, 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Tony Pederson attending the TDNA conference]
Photograph of Tony Pederson, of the Southern Methodist University attending the 2004 Texas Daily News Association annual conference held in Corpus Christi.
Date:
March 22, 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
[Tony Pederson speaking into a microphone at an TDNA conference]
Photograph of Tony Pederson, of the Southern Methodist University speaking into a microphone and addressing the audience at the 2004 Texas Daily News Association annual conference held in Corpus Christi. Donnis Baggett is seen standing in the background listening to Pederson give his speech.
Date:
March 22, 2004
Creator:
Eddie Seal Photography
Object Type:
Photograph
System:
The UNT Digital Library
Tool Support for Inspecting the Code Quality of HPC Applications
The nature of HPC application development encourages ad hoc design and implementation, rather than formal requirements analysis and design specification as is typical in software engineering. However, we cannot simply expect HPC developers to adopt formal software engineering processes wholesale, even while there is a need to improve software structure and quality to ensure future maintainability. Therefore, we propose tools that HPC developers can use at their discretion to obtain feedback on the structure and quality of their codes. This feedback would come in the form of code quality metrics and analyses, presented when necessary in intuitive and interactive visualizations. This paper summarizes our implementation of just such a tool, which we apply to a standard HPC benchmark as ''proof-of-concept.''
Date:
March 16, 2007
Creator:
Panas, T; Quinlan, D & Vuduc, R
Object Type:
Article
System:
The UNT Digital Library
Tools for Teaching Climate Change Studies
The Atmospheric Radiation Measurement Climate Research Facility (ACRF) develops public outreach materials and educational resources for schools. Studies prove that science education in rural and indigenous communities improves when educators integrate regional knowledge of climate and environmental issues into school curriculum and public outreach materials. In order to promote understanding of ACRF climate change studies, ACRF Education and Outreach has developed interactive kiosks about climate change for host communities close to the research sites. A kiosk for the North Slope of Alaska (NSA) community was installed at the Iupiat Heritage Center in 2003, and a kiosk for the Tropical Western Pacific locales will be installed in 2005. The kiosks feature interviews with local community elders, regional agency officials, and Atmospheric Radiation Measurement (ARM) Program scientists, which highlight both research and local observations of some aspects of environmental and climatic change in the Arctic and Pacific. The kiosks offer viewers a unique opportunity to learn about the environmental concerns and knowledge of respected community elders, and to also understand state-of-the-art climate research. An archive of interviews from the communities will also be distributed with supplemental lessons and activities to encourage teachers and students to compare and contrast climate change studies and …
Date:
March 18, 2005
Creator:
Maestas, A. M. & Jones, L. A.
Object Type:
Article
System:
The UNT Digital Library
Top Mass Measurement at CDF
We report on recent measurements of the top quark mass using t{bar t} candidate events selected in {approx_equal} 320 pb{sup -1} of data from the ''Run II'' operation period of the Tevatron p{bar p} collider. More emphasis is given on the best single measurement to date (M{sub top} = 173.5{sub -3.8}{sup +3.9} GeV/c{sup 2}), provided by CDF using the ''lepton plus jets'' channel, where one W decays to a lepton-neutrino pair and the other into quarks (top quarks decay to Wb almost 100% of the time).
Date:
March 1, 2006
Creator:
Kordas, Kostas
Object Type:
Article
System:
The UNT Digital Library
Top quark mass measurement
None
Date:
March 1, 2008
Creator:
Maki, Tuula & Tech., /Helsinki Inst. of Phys. /Helsinki U. of
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Top quark physics
The top quark, when it was finally discovered at Fermilab in 1995 completed the three-generation structure of the Standard Model (SM) and opened up the new field of top quark physics. Viewed as just another SM quark, the top quark appears to be a rather uninteresting species. Produced predominantly, in hadron-hadron collisions, through strong interactions, it decays rapidly without forming hadrons, and almost exclusively through the single mode t {r_arrow} Wb. The relevant CKM coupling V{sub tb} is already determined by the (three-generation) unitarity of the CKM matrix. Rare decays and CP violation are unmeasurable small in the SM. Yet the top quark is distinguished by its large mass, about 35 times larger than the mass of the next heavy quark, and intriguingly close to the scale of electroweak (EW) symmetry breaking. This unique property raises a number of interesting questions. Is the top quark mass generated by the Higgs mechanism as the SM predicts and is its mass related to the top-Higgs-Yukawa coupling? Or does it play an even more fundamental role in the EW symmetry breaking mechanism? If there are new particles lighter than the top quark, does the top quark decay into them? Could non-SM physics first …
Date:
March 24, 2000
Creator:
Ahmadov, A.; Azuelos, G.; Bauer, U.; Belyaev, A.; Berger, E. L.; Sullivan, Z. et al.
Object Type:
Article
System:
The UNT Digital Library
Top quark physics at the Tevatron
After the successful Run I of the Tevatron (1992-1996),with the top quark discovery, both CDF and D0 experiments were extensively upgraded to meet the challenges of the Tevatron Run II collider. The energy of p{bar p} collisions at the Tevatron was increased from {radical}s = 1.8 TeV to {radical}s = 1.96 TeV. t{bar t} production cross section is expected to increase by a factor of {approx} 30%. Major upgrades in the Tevatron accelerator chain will increase the Run II instantaneous luminosity: the goal is to achieve L = 5 - 20 x 10{sup 31} cm{sup 2}s{sup -1} while the highest luminosity reached up to now (September 2003) is 5.2 x 10{sup 31} cm{sup 2} s{sup -1}. In this paper we will present the top quark properties measured by both CDF and D0 with the first physics-quality data collected during the Run II (March 2002-January 2003). First we will review t{bar t} cross section measurements in the various decay channels; then top quark mass measurements will be presented.
Date:
March 17, 2004
Creator:
Sidoti, Antonio
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
A Topology of On/Off Marx Modulator with Protection of Load and Solid State Switches
This article discusses a proposal for an ultra fast feedback response that will protect the load and solid state switches of the ON/OFF Marx type modulators. The feedback guards main elements of a modulator against possible arcs in the load, particularly arcs inside of the electron guns. The chief concept behind the proposed response system is an employment of a fraction of the output modulator power as a controlling and guarding pulse during the delivery time. The time constant of the proposed feedback loop lies in the nanosecond range. Peculiarities of proposed topology are discussed.
Date:
March 5, 2007
Creator:
Krasnykh, Anatoly
Object Type:
Article
System:
The UNT Digital Library
A Toroidal Charge Monitor for High-Energy Picosecond Electron Beams
A monitor system suitable for the accurate measurement of the total charge of a 2-ps 28.5 GeV electron beam over a large dynamic range is described. Systematic uncertainties and results on absolute calibration, resolution, and long-term stability are presented.
Date:
March 28, 2007
Creator:
Simmons, Robert H. & Ng, Johnny S.T.
Object Type:
Article
System:
The UNT Digital Library
Total Dissolved Gas Effects on Fishes of the Lower Columbia River
Gas supersaturation problems generated by spill from dams on the Columbia River were first identified in the 1960s. Since that time, considerable research has been conducted on effects of gas supersaturation on aquatic life, primarily juvenile salmonids. Also since that time, modifications to dam structures and operations have reduced supersaturated gas levels produced by the dams. The limit for total dissolved gas saturation (TDGS) as mandated by current Environmental Protection Agency water quality standards is 110%. State management agencies issue limited waivers to water quality, allowing production of levels of up to 120% TDGS to facilitate the downstream migration of juvenile salmonids. Recently, gas supersaturation as a water quality issue has resurfaced as concerns have grown regarding chronic effects of spill-related total dissolved gas on salmonids, including incubating embryos and larvae, resident fish species, and other aquatic organisms. Because of current concerns, and because the last comprehensive review of research on supersaturation effects on fishes was conducted in 1997, we reviewed recent supersaturation literature to identify new or ongoing issues that may not be adequately addressed by the current 110% TDGS limit and the 120% TDGS water quality waiver. We found that recent work supports older research indicating that short-term …
Date:
March 31, 2006
Creator:
McGrath, Kathy E.; Dawley, Earl & Geist, David R.
Object Type:
Report
System:
The UNT Digital Library
Total Gamma Count Rate Analysis Method for Nondestructive Assay Characterization
A new approach to nondestructively characterize waste for disposal, based on total gamma response, has been developed at the Idaho Cleanup Project by CH2M-WG Idaho, LLC and Idaho State University, and is called the total gamma count rate analysis method. The total gamma count rate analysis method measures gamma interactions that produce energetic electrons or positrons in a detector. Based on previous experience with waste assays, the radionuclide content of the waste container is then determined. This approach potentially can yield minimum detection limits of less than 10 nCi/g. The importance of this method is twofold. First, determination of transuranic activity can be made for waste containers that are below the traditional minimum detection limits. Second, waste above 10 nCi/g and below 100 nCi/g can be identified, and a potential path for disposal resolved.
Date:
March 1, 2006
Creator:
Hoffman, Cecilia R. & Harker, Yale D.
Object Type:
Article
System:
The UNT Digital Library
Total Information Awareness Programs: Funding, Composition, and Oversight Issues
None
Date:
March 21, 2003
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Total Ore Processing Integration and Management
This report outlines the technical progress achieved for project DE-FC26-03NT41785 (Total Ore Processing Integration and Management) during the period 01 January through 31 March of 2004.
Date:
March 31, 2004
Creator:
Gertsch, Leslie & Gertsch, Richard
Object Type:
Report
System:
The UNT Digital Library
Total Risk Approach in Applying PRA to Criticality Safety
As nuclear industry continues marching from an expert-base support to more procedure-base support, it is important to revisit the total risk concept to criticality safety. A key objective of criticality safety is to minimize total criticality accident risk. The purpose of this paper is to assess key constituents of total risk concept pertaining to criticality safety from an operations support perspective and to suggest a risk-informed means of utilizing criticality safety resources for minimizing total risk. A PRA methodology was used to assist this assessment. The criticality accident history was assessed to provide a framework for our evaluation. In supporting operations, the work of criticality safety engineers ranges from knowing the scope and configurations of a proposed operation, performing criticality hazards assessment to derive effective controls, assisting in training operators, response to floor questions, surveillance to ensure implementation of criticality controls, and response to criticality mishaps. In a compliance environment, the resource of criticality safety engineers is increasingly being directed towards tedious documentation effort to meet some regulatory requirements to the effect of weakening the floor support for criticality safety. By applying a fault tree model to identify the major contributors of criticality accidents, a total risk picture is obtained …
Date:
March 24, 2005
Creator:
Huang, S T
Object Type:
Article
System:
The UNT Digital Library
TOUGH+Hydrate v1.0 User's Manual: A Code for the Simulation of System Behavior in Hydrate-Bearing Geologic Media
TOUGH+HYDRATE v1.0 is a new code for the simulation of the behavior of hydrate-bearing geologic systems. By solving the coupled equations of mass and heat balance, TOUGH+HYDRATE can model the non-isothermal gas release, phase behavior and flow of fluids and heat under conditions typical of common natural CH{sub 4}-hydrate deposits (i.e., in the permafrost and in deep ocean sediments) in complex geological media at any scale (from laboratory to reservoir) at which Darcy's law is valid. TOUGH+HYDRATE v1.0 includes both an equilibrium and a kinetic model of hydrate formation and dissociation. The model accounts for heat and up to four mass components, i.e., water, CH{sub 4}, hydrate, and water-soluble inhibitors such as salts or alcohols. These are partitioned among four possible phases (gas phase, liquid phase, ice phase and hydrate phase). Hydrate dissociation or formation, phase changes and the corresponding thermal effects are fully described, as are the effects of inhibitors. The model can describe all possible hydrate dissociation mechanisms, i.e., depressurization, thermal stimulation, salting-out effects and inhibitor-induced effects. TOUGH+HYDRATE is the first member of TOUGH+, the successor to the TOUGH2 [Pruess et al., 1991] family of codes for multi-component, multiphase fluid and heat flow developed at the Lawrence Berkeley …
Date:
March 1, 2008
Creator:
Moridis, George; Moridis, George J.; Kowalsky, Michael B. & Pruess, Karsten
Object Type:
Report
System:
The UNT Digital Library
TOUGHREACT: a new code of the TOUGH Family for Non-Isothermal multiphase reactive geochemical transport in variably saturated geologic media
Coupled modeling of subsurface multiphase fluid and heat flow, solute transport and chemical reactions can be used for the assessment of acid mine drainage remediation, waste disposal sites, hydrothermal convection, contaminant transport, and groundwater quality. We have developed a comprehensive numerical simulator, TOUGHREACT, which considers non-isothermal multi-component chemical transport in both liquid and gas phases. A wide range of subsurface thermo-physical-chemical processes is considered under various thermohydrological and geochemical conditions of pressure, temperature, water saturation, and ionic strength. The code can be applied to one-, two- or three-dimensional porous and fractured media with physical and chemical heterogeneity.
Date:
March 11, 2003
Creator:
Xu, Tianfu; Sonnenthal, Eric; Spycher, Nicolas & Pruess, Karsten
Object Type:
Article
System:
The UNT Digital Library
Toward a Diurnal Climatology of Cold-Season Turbulence Statistics in Continental Stratocumulus as Observed by the Atmospheric Radiation Millimeter- Wavelength Cloud Radars
Numerous observational studies of marine stratocumulus have demonstrated a pronounced diurnal cycle. At night, longwave flux divergence at the top of the cloud drives negatively buoyant eddies that tend to keep the boundary layer well mixed. During the day, solar absorption by the cloud tends to reduce the turbulent intensity and often decouples the planetary boundary layer (PBL) into cloud- and sub-cloud circulations. The delicate balance between turbulent intensity, entrainment, and fluxes dictates cloud geometry and persistence, which can significantly impact the shortwave radiation budget. Millimeter-wavelength cloud radars (MMCRs) have been used to study the turbulent structure of boundary layer stratocumulus (e.g. Frisch et al. 1995; Kollias and Albrecht 2000). Analysis is confined to nondrizzling or lightly drizzling cloud systems for which precipitation contamination is negligible. Under such assumptions the Doppler velocity field becomes a proxy for vertical velocity. Prior research has mainly consisted of a few case studies of specific cloud systems using radar scan strategies optimized for this particular cloud type. The MMCR operating at the Southern Great Plains Atmospheric Radiation Measurement Climate Research Facility is broadly configured to be able to detect many different cloud types over a broad range of reflectivities and altitudes, so it is …
Date:
March 18, 2005
Creator:
Mechem, D. B.; Kogan, Y. L.; Childers, M. E. & Donner, K. M.
Object Type:
Article
System:
The UNT Digital Library
Toward complete isotopic analysis of individual presolar silicon carbide grains : C, N, Si, Sr, Zr, Mo, and Ba in single grains of type X.
Presolar silicon carbide grains form in a variety of types of stars, including asymptotic giant branch red giant stars and supernovae. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively [1]. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo [2-4] and initial results for X-type SiC grains showing enrichments in the r-process isotopes of Mo[5]. We report here the first measurements of Zr, Sr, and Ba isotopes along with expanded studies of Mo in individual X-type SiC grains, which have previously been identified as having formed from supernova ejects.
Date:
March 1, 2000
Creator:
Pellin, M. J.; Calaway, W. F.; Davis, A. M.; Lewis, R. S.; Amari, S. & Clayton, R. N.
Object Type:
Article
System:
The UNT Digital Library