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EVALUATION OF TEMPORAL VARIATIONS IN HYDRAULIC CAPTURE DUE TO CHANGING FLOW PATTERNS USING MAPPING AND MODELING TECHNIQUES
Robust performance evaluation represents one of the most challenging aspects of groundwater pump-and-treat (P&T) remedy implementation. In most cases, the primary goal of the P&T system is hydraulic containment, and ultimately recovery, of contaminants to protect downgradient receptors. Estimating the extent of hydraulic containment is particularly challenging under changing flow patterns due to variable pumping, boundaries and/or other conditions. We present a systematic approach to estimate hydraulic containment using multiple lines of evidence based on (a) water-level mapping and (b) groundwater modeling. Capture Frequency Maps (CFMs) are developed by particle tracking on water-level maps developed for each available water level data set using universal kriging. In a similar manner, Capture Efficiency Maps (CEMs) are developed by particle tracking on water-levels calculated using a transient groundwater flow model: tracking is undertaken independently for each stress period using a very low effective porosity, depicting the 'instantaneous' fate of each particle each stress period. Although conceptually similar, the two methods differ in their underlying assumptions and their limitations: their use together identifies areas where containment may be reliable (i.e., where the methods are in agreement) and where containment is uncertain (typically, where the methods disagree). A field-scale example is presented to illustrate these …
Date:
April 7, 2011
Creator:
AA, SPILIOTOPOULOS; LC, SWANSON; R, SHANNON & MJ, TONKIN
Object Type:
Article
System:
The UNT Digital Library
Search for the Rare Radiative Decay: $W\rightarrow\pi\gamma$ in $p\bar{p}$ Collisions at $\sqrt{s} = 1.96$ TeV
We present a search for the rare radiative decay W{sup {+-}} {yields} {pi}{sup {+-}}{gamma} using data corresponding to an integrated luminosity of 4.3 fb{sup -1} of proton-antiproton collisions at a center of mass energy of 1.96 TeV collected by the CDF experiment at Fermilab. As no statistically significant signal is observed, we set a 95% confidence level upper limit on the relative branching fraction {Gamma}(W{sup {+-}} {yields} {pi}{sup {+-}}{gamma})/{Gamma}(W{sup {+-}} {yields} e{sup {+-}}{nu}) at 6.4 x 10{sup -5}, a factor of 10 improvement over the previous limit.
Date:
April 1, 2011
Creator:
Aaltonen, T.; Phys., /Helsinki Inst. of; Alvarez Gonzalez, B.; Phys., /Oviedo U. /Cantabria Inst. of; Amerio, S.; /INFN, Padua et al.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Rula Walid Bibi, April 24, 2011
Access:
Use of this item is restricted to the UNT Community
Interview with Rula Walid Bibi, Palestinian-born immigrant to Plano, Texas, for the DFW Metroplex Immigrants Oral History Project. The interview includes Bibi's personal experience with discrimination of Palestinians in the Middle East, childhood in Kuwait City, education at the University of Kuwait and Midwestern State University, family experiences during the First Gulf War and circumstances surrounding her immigration to Texas in 1990, thoughts on religion, experiences as a single mother as well as experiences of living in Wichita Falls, Dallas, Richardson, Garland, and Plano. Bibi talks about her first impressions of the U.S., her career in medical technologies, her marriage to an American man and his conversion to Islam, her involvement with political organizations, and thoughts on American education and foreign policy.
Date:
April 24, 2011
Creator:
Abigail, R. Matthew & Bibi, Rula Walid
Object Type:
Book
System:
The UNT Digital Library
Hybrid Organic-Inorganic Composite Solar Cells for Efficient, Low Cost, Photoelectric Energy Conversion
Cadmium selenide nanoparticles and nanoclusters were prepared and added to polymer solar cells to improve their photon capture ability. These nanoparticles did exhibit some beneficial effects on the photon conversion efficiencies of selected polymer solar cells. Ternary bulk heterojunction systems based on composites of methyl viologen-doped, CdSe nanoparticles blended with poly (3-hexothiopene) (P3HT) and 6, 6-phenyl C{sub 61}-butyric acid methyl ester (PCBM) were also tested. It was found that the devices with methyl viologen-doped CdSe nanoparticles do produce more photocurrent in a region surrounding the absorption peak of the particles (560 to 660nm) when compared to pristine P3HT:PCBM devices. Gold nanorods were also prepared and tested in some solar cells. These nanorods did produce a very small enhancement in photon absorbance, but the observed increase the photon conversion efficiency was not sufficient to make the effort worthwhile. Our goals were (1) to prepare cadmium sulfide and cadmium selenide clusters and nanoparticles to be tested as photon absorbers to enhance the photon conversion efficiency of polymer solar polymer solar cells and (2) to prepare gold and silver nanorods to be added to polymer solar cells to enhance their photon capture capability. The cadmium sulfide and cadmium selenide nanoparticles and some new …
Date:
April 6, 2011
Creator:
Adams, Richard D.
Object Type:
Report
System:
The UNT Digital Library
CONFIRMATORY SURVEY RESULTS FOR PORTIONS OF THE MATERIALS AND EQUIPMENT FROM UNITS 1 AND 2 AT THE HUMBOLDT BAY POWER PLANT, EUREKA, CALIFORNIA
The Pacific Gas & Electric Company (PG&E) operated the Humboldt Bay Power Plant (HBPP) Unit 3 nuclear reactor near Eureka, California under Atomic Energy Commission (AEC) provisional license number DPR-7. HBPP Unit 3 achieved initial criticality in February 1963 and began commercial operations in August 1963. Unit 3 was a natural circulation boiling water reactor with a direct-cycle design. This design eliminated the need for heat transfer loops and large containment structures. Also, the pressure suppression containment design permitted below-ground construction. Stainless steel fuel claddings were used from startup until cladding failures resulted in plant system contamination—zircaloy-clad fuel was used exclusively starting in 1965 eliminating cladding-related contamination. A number of spills and gaseous releases were reported during operations resulting in a range of mitigative activities (see ESI 2008 for details).
Date:
April 1, 2011
Creator:
Adams, W. C.
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2011-04-02 – African Cultural Festival
Access:
Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Voertman Hall.
Date:
April 2, 2011
Creator:
Afrikania Cultural Troupe & Alorwoyie, Torgbui Midawo Gideon Foli
Object Type:
Sound
System:
The UNT Digital Library
Monte Carlo Simulations of Cosmic Rays Hadronic Interactions
This document describes the construction and results of the MaCoR software tool, developed to model the hadronic interactions of cosmic rays with different geometries of materials. The ubiquity of cosmic radiation in the environment results in the activation of stable isotopes, referred to as cosmogenic activities. The objective is to use this application in conjunction with a model of the MAJORANA DEMONSTRATOR components, from extraction to deployment, to evaluate cosmogenic activation of such components before and after deployment. The cosmic ray showers include several types of particles with a wide range of energy (MeV to GeV). It is infeasible to compute an exact result with a deterministic algorithm for this problem; Monte Carlo simulations are a more suitable approach to model cosmic ray hadronic interactions. In order to validate the results generated by the application, a test comparing experimental muon flux measurements and those predicted by the application is presented. The experimental and simulated results have a deviation of 3%.
Date:
April 1, 2011
Creator:
Aguayo Navarrete, Estanislao; Orrell, John L. & Kouzes, Richard T.
Object Type:
Report
System:
The UNT Digital Library
Fast timing detectors for forward protons at the LHC
The author discusses the development of high precision timing detectors for high momentum protons at the LHC, and their application in studying exclusive Higgs boson production.
Date:
April 1, 2011
Creator:
Albrow, Michael
Object Type:
Article
System:
The UNT Digital Library
The Gray Wolf and the Endangered Species Act: A Brief Legal History
This report provides a brief history of the laws, regulations, and lawsuits related to the wolf's protected status.
Date:
April 13, 2011
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Marvin T. Alexander, April 4, 2011
Transcript of an oral interview with Marvin T. Alexander. Alexander grew up in Louisiana and entered the Navy in early 1941. Upon completion of basic training at San Diego, Alexander was assigned as an engine mechanic to Patrol Squadron 12 (VP-12), which flew PBY airplanes at Coronado Naval Air Station. His unit was sent to Pearl Harbor in October, 1941. Alexander describes what he witnessed at Ford Island on 7 December 1941 when the Japanese attacked Pearl Harbor. Alexander was also present on Midway during the Battle of Midway. Eventually, VP-12 headed for the Solomon Islands where they conducted search and rescue operations. Alexander and VP-12 stayed aboard the USS Wright (AV-1), a seaplane tender. Sometime in 1943, Alexander received some home leave and returned to the US. He was still stationed in the US when the war ended.
Date:
April 4, 2011
Creator:
Alexander, Marvin T.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Marvin T. Alexander, April 4, 2011
Transcript of an oral interview with Marvin T. Alexander. Alexander grew up in Louisiana and entered the Navy in early 1941. Upon completion of basic training at San Diego, Alexander was assigned as an engine mechanic to Patrol Squadron 12 (VP-12), which flew PBY airplanes at Coronado Naval Air Station. His unit was sent to Pearl Harbor in October, 1941. Alexander describes what he witnessed at Ford Island on 7 December 1941 when the Japanese attacked Pearl Harbor. Alexander was also present on Midway during the Battle of Midway. Eventually, VP-12 headed for the Solomon Islands where they conducted search and rescue operations. Alexander and VP-12 stayed aboard the USS Wright (AV-1), a seaplane tender. Sometime in 1943, Alexander received some home leave and returned to the US. He was still stationed in the US when the war ended.
Date:
April 4, 2011
Creator:
Alexander, Marvin T.
Object Type:
Text
System:
The Portal to Texas History
Oral History Interview with Alessandro Buccilli, April 6, 2011
Access:
Use of this item is restricted to the UNT Community
Interview with Italian immigrant Alessandro Buccilli, Director of Marketing and Sales Administration for Peterbilt Motors Company, as part of the DFW Metroplex Immigrants Oral History Project. Buccilli discusses his family background in Rome, Italy, his education, employment in the U.S., the shifts in perceptions about Italy and the U.S., social responsibility, learning English, his perspectives on the importance of language and culture, raising American children, and his legacy. The interview also includes Buccilli's comparisons of opportunities, bureaucracy, culture, and national immigration debates in Italy and the U.S.
Date:
April 6, 2011
Creator:
Alexander, Matthew & Buccilli, Alessandro
Object Type:
Book
System:
The UNT Digital Library
Continued Fractions and Sturmian Words: Discover the Power of Mathematics!
Presentation for the 2011 University Scholars Day at the University of North Texas discussing research on continued fractions as an alternative to decimal expansions.
Date:
April 14, 2011
Creator:
Allen, Andrew & Cherry, William, 1966-
Object Type:
Presentation
System:
The UNT Digital Library
Graduate Artist Certificate Recital: 2011-04-21 – Reuben Allred, piano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Graduate Artist Certificate in Music Performance.
Date:
April 21, 2011
Creator:
Allred, Reuben
Object Type:
Sound
System:
The UNT Digital Library
DISTRIBUTION COEFICIENTS (KD) GENERATED FROM A CORE SAMPLE COLLECTED FROM THE SALTSTONE DISPOSAL FACILITY
Core samples originating from Vault 4, Cell E of the Saltstone Disposal Facility (SDF) were collected in September of 2008 (Hansen and Crawford 2009, Smith 2008) and sent to SRNL to measure chemical and physical properties of the material including visual uniformity, mineralogy, microstructure, density, porosity, distribution coefficients (K{sub d}), and chemical composition. Some data from these experiments have been reported (Cozzi and Duncan 2010). In this study, leaching experiments were conducted with a single core sample under conditions that are representative of saltstone performance. In separate experiments, reducing and oxidizing environments were targeted to obtain solubility and Kd values from the measurable species identified in the solid and aqueous leachate. This study was designed to provide insight into how readily species immobilized in saltstone will leach from the saltstone under oxidizing conditions simulating the edge of a saltstone monolith and under reducing conditions, targeting conditions within the saltstone monolith. Core samples were taken from saltstone poured in December of 2007 giving a cure time of nine months in the cell and a total of thirty months before leaching experiments began in June 2010. The saltstone from Vault 4, Cell E is comprised of blast furnace slag, class F fly …
Date:
April 25, 2011
Creator:
Almond, P. & Kaplan, D.
Object Type:
Report
System:
The UNT Digital Library
Senior Recital: 2011-04-10 - Michelle Alonso, composer
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date:
April 10, 2011
Creator:
Alonso, Michelle
Object Type:
Sound
System:
The UNT Digital Library
Making Stuff Outreach at the Ames Laboratory and Iowa State University
The U. S. Department of Energy's Ames Laboratory in Ames, Iowa was a coalition partner for outreach activities connected with NOVA's Making Stuff television series on PBS. Volunteers affiliated with the Ames Laboratory and Iowa State University, with backgrounds in materials science, took part in activities including a science-themed Family Night at a local mall, Science Cafes at the Science Center of Iowa, teacher workshops, demonstrations at science nights in elementary and middle schools, and various other events. We describe a selection of the activities and present a summary of their outcomes and extent of their impact on Ames, Des Moines and the surrounding communities in Iowa. In Part 2, results of a volunteer attitude survey are presented, which shed some light on the volunteer experience and show how the volunteers participation in outreach activities has affected their views of materials education.
Date:
April 1, 2011
Creator:
Ament, Katherine; Karsjen, Steven; Leshem-Ackerman, Adah & King, Alexander
Object Type:
Article
System:
The UNT Digital Library
Southwest Retort, Volume 63, Number 8, April 2011
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
April 2011
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Visualization of Atomization Gas Flow and Melt Break-up Effects in Response to Nozzle Design
Both powder particle size control and efficient use of gas flow energy are highly prized goals for gas atomization of metal and alloy powder to minimize off-size powder inventory (or 'reverb') and excessive gas consumption. Recent progress in the design of close-coupled gas atomization nozzles and the water model simulation of melt feed tubes were coupled with previous results from several types of gas flow characterization methods, e.g., aspiration measurements and gas flow visualization, to make progress toward these goals. Size distribution analysis and high speed video recordings of gas atomization reaction synthesis (GARS) experiments on special ferritic stainless steel alloy powders with an Ar+O{sub 2} gas mixture were performed to investigate the operating mechanisms and possible advantages of several melt flow tube modifications with one specific gas atomization nozzle. In this study, close-coupled gas atomization under closed wake gas flow conditions was demonstrated to produce large yields of ultrafine (dia.<20 {mu}m) powders (up to 32%) with moderate standard deviations (1.62 to 1.99). The increased yield of fine powders is consistent with the dual atomization mechanisms of closed wake gas flow patterns in the near-field of the melt orifice. Enhanced size control by stabilized pre-filming of the melt with a …
Date:
April 1, 2011
Creator:
Anderson, Iver; Rieken, Joel; Meyer, John; Byrd, David & Heidloff, Andy
Object Type:
Article
System:
The UNT Digital Library
Doctoral Recital: 2011-04-26 - Matthew Anderson, trumpet
Recital presented at First United Methodist Church in Denton, Texas in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
April 26, 2011
Creator:
Anderson, Matthew
Object Type:
Sound
System:
The UNT Digital Library
LIFE Delivery Plan
None
Date:
April 18, 2011
Creator:
Anklam, T M
Object Type:
Report
System:
The UNT Digital Library
LIFE: Recent Developments and Progress
Test results from the NIF show excellent progress toward achieving ignition. Experiments designed to verify coupling of the laser energy to the fusion target have shown that the efficiency meets that needed for ignition. Several tests with the cryogenic targets needed for ignition have been performed, and world-record neutron output produced. The National Ignition Campaign is on schedule to meet its 2012 ignition milestone, with the next phase in the campaign due to start later this month. It has been a busy and very productive year. The NIF is in full 24/7 operations and has progressed markedly in the path toward ignition. The long-standing goal of the National Ignition Campaign to demonstrate ignition by the end of FY 2012 is on track. The LIFE plant design has matured considerably, and a delivery plan established based on close interactions with vendors. National-level reviews of fusion are underway, and are due to present initial findings later this year. A value proposition has been drafted for review. The LIFE project is ready to move into the delivery phase.
Date:
April 8, 2011
Creator:
Anklam, T M
Object Type:
Report
System:
The UNT Digital Library
LIFE Cost of Electricity, Capital and Operating Costs
Successful commercialization of fusion energy requires economic viability as well as technical and scientific feasibility. To assess economic viability, we have conducted a pre-conceptual level evaluation of LIFE economics. Unit costs are estimated from a combination of bottom-up costs estimates, working with representative vendors, and scaled results from previous studies of fission and fusion plants. An integrated process model of a LIFE power plant was developed to integrate and optimize unit costs and calculate top level metrics such as cost of electricity and power plant capital cost. The scope of this activity was the entire power plant site. Separately, a development program to deliver the required specialized equipment has been assembled. Results show that LIFE power plant cost of electricity and plant capital cost compare favorably to estimates for new-build LWR's, coal and gas - particularly if indicative costs of carbon capture and sequestration are accounted for.
Date:
April 14, 2011
Creator:
Anklam, T.
Object Type:
Report
System:
The UNT Digital Library
Magnetic Alignment of Pulsed Solenoids Using the Pulsed Wire Method
A unique application of the pulsed-wire measurement method has been implemented for alignment of 2.5 T pulsed solenoid magnets. The magnetic axis measurement has been shown to have a resolution of better than 25 {micro}m. The accuracy of the technique allows for the identification of inherent field errors due to, for example, the winding layer transitions and the current leads. The alignment system is developed for the induction accelerator NDCX-II under construction at LBNL, an upgraded Neutralized Drift Compression experiment for research on warm dense matter and heavy ion fusion. Precise alignment is essential for NDCX-II, since the ion beam has a large energy spread associated with the rapid pulse compression such that misalignments lead to corkscrew deformation of the beam and reduced intensity at focus. The ability to align the magnetic axis of the pulsed solenoids to within 100 pm of the induction cell axis has been demonstrated.
Date:
April 1, 2011
Creator:
Arbelaez, D.; Madur, A.; Lipton, T. M.; Waldron, W. L. & Kwan, J. W.
Object Type:
Article
System:
The UNT Digital Library