An Evaluation of a Structured Overlapping Grid Implementation of FCT for High-Speed Flows (open access)

An Evaluation of a Structured Overlapping Grid Implementation of FCT for High-Speed Flows

None
Date: August 24, 2011
Creator: Banks, J. W. & Shadid, J. N.
System: The UNT Digital Library
Advances in Quantum Monte Carlo (open access)

Advances in Quantum Monte Carlo

None
Date: August 16, 2011
Creator: Tubman, N.; Dubois, J. L. & Alder, B.
System: The UNT Digital Library
NLM Evidence-based Information at Your Fingertips - NBNA (open access)

NLM Evidence-based Information at Your Fingertips - NBNA

The workshop titled, National Library of Medicine: Evidence-based Information At Your Fingertips, is a computer training class designed to meet the needs of nurses who require access to information on specific medical topics and on the adverse health effects of exposure to hazardous substances. The Specialized Information Services Division of the National Library of Medicine (NLM) is sponsoring this workshop for the National Black Nurses Association to increase the awareness of health professionals of the availability and value of the free NLM medical, environmental health, and toxicology databases.
Date: August 6, 2010
Creator: Womble, R.
System: The UNT Digital Library
NLM Evidence-based Information At Your Fingertips - NMA (open access)

NLM Evidence-based Information At Your Fingertips - NMA

The National Library of Medicine: Evidenced-Based Information at Your Fingertips workshop is designed specifically for physicians attending the Community Medicine and Public Health Section portion of the National Medical Association 2010 Annual Convention and Scientific Assembly. This course seeks to address the digital divide issue by teaching participants to use the NLM resources and to improve their ability to use health information echnology to treat their patients and develop strategies to eliminate race-based disparities in health.
Date: August 2, 2010
Creator: McMurray, L.
System: The UNT Digital Library
Environmental Health Information Partnership Proceedings: March 25-26, 2010 (open access)

Environmental Health Information Partnership Proceedings: March 25-26, 2010

Proceedings of the Environmental Health Information Partnership (EnHIP) Meeting March 25-26, 2010
Date: August 1, 2010
Creator: lange, L. and R. Foster
System: The UNT Digital Library
Anisotropic Hexagonal Boron Nitride Nanomaterials - Synthesis and Applications (open access)

Anisotropic Hexagonal Boron Nitride Nanomaterials - Synthesis and Applications

Boron nitride (BN) is a synthetic binary compound located between III and V group elements in the Periodic Table. However, its properties, in terms of polymorphism and mechanical characteristics, are rather close to those of carbon compared with other III-V compounds, such as gallium nitride. BN crystallizes into a layered or a tetrahedrally linked structure, like those of graphite and diamond, respectively, depending on the conditions of its preparation, especially the pressure applied. Such correspondence between BN and carbon readily can be understood from their isoelectronic structures [1, 2]. On the other hand, in contrast to graphite, layered BN is transparent and is an insulator. This material has attracted great interest because, similar to carbon, it exists in various polymorphic forms exhibiting very different properties; however, these forms do not correspond strictly to those of carbon. Crystallographically, BN is classified into four polymorphic forms: Hexagonal BN (h-BN) (Figure 1(b)); rhombohedral BN (r-BN); cubic BN (c-BN); and wurtzite BN (w-BN). BN does not occur in nature. In 1842, Balmain [3] obtained BN as a reaction product between molten boric oxide and potassium cyanide under atmospheric pressure. Thereafter, many methods for its synthesis were reported. h-BN and r-BN are formed under ambient …
Date: August 1, 2008
Creator: Han,W.Q.
System: The UNT Digital Library
The Fidelity of Ocean Models With Explicit Eddies (Chapter 17) (open access)

The Fidelity of Ocean Models With Explicit Eddies (Chapter 17)

Current practices within the oceanographic community have been reviewed with regard to the use of metrics to assess the realism of the upper-ocean circulation, ventilation processes diagnosed by time-evolving mixed layer depth and mode water formation, and eddy heat fluxes in large-scale fine resolution ocean model simulations. We have striven to understand the fidelity of these simulations in the context of their potential use in future fine-resolution coupled climate system studies. A variety of methodologies are used to assess the veracity of the numerical simulations. Sea surface height variability and the location of western boundary current paths from altimetry have been used routinely as basic indicators of fine-resolution model performance. Drifters and floats have also been used to provide pseudo-Eulerian measures of the mean and variability of surface and sub-surface flows, while statistical comparisons of observed and simulated means have been carried out using James tests. Probability density functions have been used to assess the Gaussian nature of the observed and simulated flows. Length and time scales have been calculated in both Eulerian and Lagrangian frameworks from altimetry and drifters, respectively. Concise measures of multiple model performance have been obtained from Taylor diagrams. The time-evolution of the mixed layer depth …
Date: August 1, 2007
Creator: McClean, J.; Jayne, S.; Maltrud, M. & Ivanova, D.
System: The UNT Digital Library
PHOTOEMISSION AS A PROBE OF THE COLLECTIVE EXCITATIONS IN CONDENSED MATTER SYSTEMS. (open access)

PHOTOEMISSION AS A PROBE OF THE COLLECTIVE EXCITATIONS IN CONDENSED MATTER SYSTEMS.

New developments in instrumentation have recently allowed photoemission measurements to be performed with very high energy and momentum resolution.[1] This has allowed detailed studies of the self-energy corrections to the lifetime and mass renormalization of excitations in the vicinity of the Fermi level. These developments come at an opportune time. Indeed the discovery of high temperature superconductivity in the cuprates and related systems is presenting a range of challenges for condensed matter physics.[2] Does the mechanism of high T{sub c} superconductivity represent new physics? Do we need to go beyond Landau's concept of the Fermi liquid?[3] What, if any, is the evidence for the presence or absence of quasiparticles in the excitation spectra of these complex oxides? The energy resolution of the new instruments is comparable to or better than the energy or temperature scale of superconductivity and the energy of many collective excitations. As such, photoemission has again become recognized as an important probe of condensed matter. Studies of the high T{sub c} superconductors and related materials are aided by the observation that they are two dimensional. To understand this, we note that the photoemission process results in both an excited photoelectron and a photohole in the final state. …
Date: August 1, 2006
Creator: Johnson, Peter D. & Valla, Tonica
System: The UNT Digital Library
SOME RECENT STUDIES IN RUGHENIUM ELECTROCHEMISTRY AND ELECTROCATALYSIS. (open access)

SOME RECENT STUDIES IN RUGHENIUM ELECTROCHEMISTRY AND ELECTROCATALYSIS.

Ruthenium is a metal of a considerable importance in electrochemical science and technology. It is a catalyst or co-catalyst material in Pt-Ru alloys for methanol- and reformate hydrogen-oxidation in fuel cells, while ruthenium oxide, a component in chlorine-evolution catalysts, represents an attractive material for electrochemical supercapacitors. Its facile surface oxidation generates an oxygen-containing species that provides active oxygen in some reactions. Ru sites in Pt-Ru catalysts increase the ''CO tolerance'' of Pt in the catalytic oxidation-reaction in direct methanol fuel cells (DMFC) and in reformate hydrogen-oxidation in proton exchange membrane fuel cells (PEMFC). The mechanism of Ru action is not completely understood, although current consensus revolves around the so-called ''bifunctional mechanism'' wherein Ru provides oxygenated species to oxidize CO that blocks Pt sites, and has an electronic effect on Pt-CO interaction. While various studies of polycrystalline Ru go back several decades those involving single crystal surfaces and the structural sensitivity of reactions on Ru surfaces emerged only recently. Using well-ordered single crystalline surfaces brings useful information as the processes on realistic catalysts are far too complex to allow identification of the microscopic reaction steps. In this article, we focus on progress in model systems and conditions, such as electrochemistry and …
Date: August 1, 2006
Creator: MARINKOVIC, N.S.; VUKMIROVIC, M.B. & ADZIC, R.R.
System: The UNT Digital Library
Development of U.S. Regulations for the Transportation of Radioactive Materials - A Look Back Over the Past 40 Years (open access)

Development of U.S. Regulations for the Transportation of Radioactive Materials - A Look Back Over the Past 40 Years

The discussion in this Chapter is a relatively straightforward, chronological description of the development of U.S. transportation regulations for radioactive materials over the past 40 years. Although primarily based on the development of U.S. regulations for the shipment of what is now known as Type B quantities of radioactive materials, the information presented details the interactions between a number of U.S. governmental agencies, commissions, and departments, and the International Atomic Energy Agency (IAEA). For the most part, the information that follows was taken directly from the Federal Register, between 1965 and 2004, which, within the boundaries of the U.S., is considered law, or at least policy at the federal level. Starting in 1978, however, the information presented also takes a look at a series of so-called Guidance Documents, including Regulatory Guides (Reg. Guides), NUREGs, and NUREG/CRs. Developed originally by the U.S. Atomic Energy Agency (AEC), and later adapted by the U.S. Nuclear Regulatory Commission (NRC), the NUREGs and NUREG/CRs cited in this Chapter clearly specify a preferred methodology that can be used to meet the regulatory requirements of Title 10 of the Code of Federal Regulations, Part 71 (10 CFR Part 71, or, more simply, 10 CFR 71). As is …
Date: August 29, 2005
Creator: Hafner, R. S.
System: The UNT Digital Library
Susceptibility to Exposure to Heterocyclic Amines from Cooked Food: Role of UDP-glucuronosyltransferases (open access)

Susceptibility to Exposure to Heterocyclic Amines from Cooked Food: Role of UDP-glucuronosyltransferases

A number of carcinogenic heterocyclic amines (PhIP, MeIQx, and DiMeIQx) are produced from the condensation of creatinine, hexoses and amino acids during the cooking of meat (1). There are many variables that impact the production and subsequent ingestion of these compounds in our diet. Temperature, type of meat product, cooking method, doneness, and other factors affect the quantity of these carcinogens consumed by humans. Estimates of ingestion of these carcinogens are 1-20 ng/kg body weight per day (2). Human case control studies that correlate meat consumption from well-done cooking practices with cancer incidence indicate excess tumors for breast, colon, stomach, esophagus, and possibly prostate (3-5).
Date: August 22, 2005
Creator: Malfatti, M. A. & Felton, J. S.
System: The UNT Digital Library
From Sequential Extraction to Transport Modeling: Monitored Natural Attenuation as a Remediation Approach for Inorganic Contaminants (open access)

From Sequential Extraction to Transport Modeling: Monitored Natural Attenuation as a Remediation Approach for Inorganic Contaminants

To quantify metal natural attenuation processes in terms of environmental availability, sequential extraction experiments were carried out on subsurface soil samples impacted by a low pH, high sulfate, metals (Be, Ni, U, As) plume associated with the long-term operation of a coal plant at the Savannah River Site in South Carolina. Despite significant heterogeneity resulting both from natural and anthropogenic factors, sequential extraction results demonstrate that pH is a controlling factor in the prediction of the distribution of metal contaminants within the solid phases in soils at the site as well as the contaminant partitioning between the soil and the soil solution. Results for beryllium, the most mobile metal evaluated, exhibit increasing attenuation along the plume flow path which corresponds to an increasing plume pH. These laboratory- and field-scale studies provide mechanistic information regarding partitioning of metals to soils at the site (one of the major attenuation mechanisms for the metals at the field site). Subsequently, these data have been used in the definition of the contaminant source terms and contaminant transport factors in risk modeling for the site.
Date: August 18, 2005
Creator: Crapse, Kimberly P.; Serkiz, Steven M.; Pishko, Adrian L.; Kaplan, Daniel L.; Lee, Cindy M. & Schank, Anja
System: The UNT Digital Library
Buildings Sector Analysis (open access)

Buildings Sector Analysis

A joint NREL, ORNL, and PNNL team conducted market analysis to help inform DOE/EERE's Weatherization and Intergovernmental Program planning and management decisions. This chapter presents the results of the market analysis for the Buildings sector.
Date: August 1, 2005
Creator: Hostick, Donna J.; Nicholls, Andrew K.; McDonald, Sean C. & Hollomon, Jonathan B.
System: The UNT Digital Library
Bridging the Gap between Quantum Mechanics and Large-Scale Atomistic Simulation (open access)

Bridging the Gap between Quantum Mechanics and Large-Scale Atomistic Simulation

The prospect of modeling across disparate length and time scales to achieve a predictive multiscale description of real materials properties has attracted widespread research interest in the last decade. To be sure, the challenges in such multiscale modeling are many, and in demanding cases, such as mechanical properties or dynamic phase transitions, multiple bridges extending from the atomic level all the way to the continuum level must be built. Although often overlooked in this process, one of the most fundamental and important problems in multiscale modeling is that of bridging the gap between first-principles quantum mechanics, from which true predictive power for real materials emanates, and the large-scale atomistic simulation of thousands or millions of atoms, which is usually essential to describe the complex atomic processes that link to higher length and time scales. For example, to model single-crystal plasticity at micron length scales via dislocation-dynamics simulations that evolve the detailed dislocation microstructure requires accurate large-scale atomistic information on the mobility and interaction of individual dislocations. Similarly, modeling the kinetics of structural phase transitions requires linking accurate large-scale atomistic information on nucleation processes with higher length and time scale growth processes.
Date: August 16, 2004
Creator: Moriarty, J. A.
System: The UNT Digital Library
Quantum Mechanical Theories of Consciousness (open access)

Quantum Mechanical Theories of Consciousness

The principal quantum mechanical theories of the mind/brain connection are described.
Date: August 16, 2004
Creator: Stapp, Henry P.
System: The UNT Digital Library
14th Workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes; Extended Abstracts and Papers (open access)

14th Workshop on Crystalline Silicon Solar Cells & Modules: Materials and Processes; Extended Abstracts and Papers

The 14th Workshop will provide a forum for an informal exchange of technical and scientific information between international researchers in the photovoltaic and relevant non-photovoltaic fields. It will offer an excellent opportunity for researchers in private industry and at universities to prioritize mutual needs for future collaborative research. The workshop is intended to address the fundamental properties of PV silicon, new solar cell designs, advanced solar cell processing techniques, and cell-related module issues. A combination of oral presentations by invited speakers, poster sessions, and discussion sessions will review recent advances in crystal growth, new cell designs, new processes and process characterization techniques, cell fabrication approaches suitable for future manufacturing demands, and solar cell encapsulation. This year's theme, ''Crystalline Si Solar Cells: Leapfrogging the Barriers,'' reflects the continued success of crystalline Si PV in overcoming technological barriers to improve solar cell performance and lower the cost of Si PV. The workshop will consist of presentations by invited speakers, followed by discussion sessions. In addition, there will be two poster sessions presenting the latest research and development results. Some presentations will address recent technologies in the microelectronics field that may have a direct bearing on PV. The sessions will include: Advances in …
Date: August 1, 2004
Creator: Sopori, B. L.
System: The UNT Digital Library
13th Workshop on Crystalline Silicon Solar Cell Materials and Processes: Extended Abstracts and Papers (open access)

13th Workshop on Crystalline Silicon Solar Cell Materials and Processes: Extended Abstracts and Papers

The 13th Workshop will provide a forum for an informal exchange of technical and scientific information between international researchers in the photovoltaic and relevant non-photovoltaic fields. It will offer an excellent opportunity for researchers in private industry and at universities to prioritize mutual needs for future collaborative research. The workshop is intended to address the fundamental aspects of impurities and defects in silicon: their properties, the dynamics during device processing, and their application for developing low-cost processes for manufacturing high-efficiency silicon solar cells. A combination of oral, poster, and discussion sessions will review recent advances in crystal growth, new cell structures, new processes and process characterization techniques, and cell fabrication approaches suitable for future manufacturing demands.
Date: August 1, 2003
Creator: Sopori, B. L.; Rand, J.; Saitoh, T.; Sinton, R.; Stavola, M.; Swanson, D. et al.
System: The UNT Digital Library
Handbook for Planning and Conducting Charrettes for High-Performance Projects (open access)

Handbook for Planning and Conducting Charrettes for High-Performance Projects

The purpose of this handbook is to furnish guidance for planning and conducting a"high-performance building" charrette, sometimes called a"greening charrette." The handbook answers typical questions that will arise, such as"What is a charrette?""Why conduct a charrette?""What topics should we cover during the charrette?" and"Whom should we invite?" It also contains samples of agendas, invitation letters, and other commonly used charrette materials. This handbook also outlines the characteristics of a good charrette facilitator. It gives suggestions for the types of experts to invite to the event to motivate participants and answer their questions. The handbook includes sample presentations that can be used by these experts to ensure they address the required technical content. It suggests the types of participants, including technical, political, and community representatives, to invite to the charrette. It offers advice for forming effective breakout groups to ensure that a broad range of complementary expertise is represented in each group. We have also included guidance on how best to include key decision makers and stakeholders who are able to attend only portions of the event.
Date: August 1, 2003
Creator: Lindsey, G.; Todd, J. A. & Hayter, S. J.
System: The UNT Digital Library
Assessing Climate to Improve Solar Design. Energy Efficiency and Renewable Energy Clearinghouse (EREC) Brochure (open access)

Assessing Climate to Improve Solar Design. Energy Efficiency and Renewable Energy Clearinghouse (EREC) Brochure

This fact sheet complements the fact sheet on passive solar design, and provides information on how sunlight, weather patterns, and microclimates affect the performance of solar energy systems and designs.
Date: August 29, 2001
Creator: Phillips, J.
System: The UNT Digital Library
OIT Tools Can Help You Improve Productivity: Office of Industrial Technologies (OIT) Industries of the Future BestPractices Tools and Information Fact Sheet (open access)

OIT Tools Can Help You Improve Productivity: Office of Industrial Technologies (OIT) Industries of the Future BestPractices Tools and Information Fact Sheet

This case study is the latest in a series on industrial firms who are implementing energy efficient technologies and system improvements into their manufacturing processes. The case studies document the activities, savings, and lessons learned on these projects.
Date: August 22, 2001
Creator: United States. Department of Energy.
System: The UNT Digital Library
Plant-Wide Assessments Help Industry Identify Energy and Cost Savings Opportunities: Office of Industrial Technologies (OIT) Industries of the Future BestPractices Plant-Wide Assessments Fact Sheet (open access)

Plant-Wide Assessments Help Industry Identify Energy and Cost Savings Opportunities: Office of Industrial Technologies (OIT) Industries of the Future BestPractices Plant-Wide Assessments Fact Sheet

This case study is the latest in a series on industrial firms who are implementing energy efficient technologies and system improvements into their manufacturing processes. The case studies document the activities, savings, and lessons learned on these projects.
Date: August 22, 2001
Creator: United States. Department of Energy.
System: The UNT Digital Library
POLYETHYLENE ENCAPSULATION. (open access)

POLYETHYLENE ENCAPSULATION.

Polyethylene microencapsulation physically homogenizes and incorporates mixed waste particles within a molten polymer matrix, forming a solidified final waste form upon cooling. Each individual particle of waste is embedded within the polymer block and is surrounded by a durable, leach-resistant coating. The process has been successfully applied for the treatment of a broad range of mixed wastes, including evaporator concentrate salts, soil, sludges, incinerator ash, off-gas blowdown solutions, decontamination solutions, molten salt oxidation process residuals, ion exchange resins, granular activated carbon, shredded dry active waste, spill clean-up residuals, depleted uranium powders, and failed grout waste forms. For waste streams containing high concentrations of soluble toxic metal contaminants, additives can be used to further reduce leachability, thus improving waste loadings while meeting or exceeding regulatory disposal criteria. In this configuration, contaminants are both chemically stabilized and physically solidified, making the process a true stabilization/solidification (S/S) technology. Unlike conventional hydraulic cement grouts or thermosetting polymers, thermoplastic polymers such as polyethylene require no chemical. reaction for solidification. Thus, a stable, solid, final waste form product is assured on cooling. Variations in waste chemistry over time do not affect processing parameters and do not require reformulation of the recipe. Incorporation of waste particles within …
Date: August 22, 2001
Creator: Kalb, P.
System: The UNT Digital Library
SULFUR POLYMER ENCAPSULATION. (open access)

SULFUR POLYMER ENCAPSULATION.

Sulfur polymer cement (SPC) is a thermoplastic polymer consisting of 95 wt% elemental sulfur and 5 wt% organic modifiers to enhance long-term durability. SPC was originally developed by the U.S. Bureau of Mines as an alternative to hydraulic cement for construction applications. Previous attempts to use elemental sulfur as a construction material in the chemical industry failed due to premature degradation. These failures were caused by the internal stresses that result from changes in crystalline structure upon cooling of the material. By reacting elemental sulfur with organic polymers, the Bureau of Mines developed a product that successfully suppresses the solid phase transition and significantly improves the stability of the product. SPC, originally named modified sulfur cement, is produced from readily available, inexpensive waste sulfur derived from desulfurization of both flue gases and petroleum. The commercial production of SPC is licensed in the United States by Martin Resources (Odessa, Texas) and is marketed under the trade name Chement 2000. It is sold in granular form and is relatively inexpensive ({approx}$0.10 to 0.12/lb). Application of SPC for the treatment of radioactive, hazardous, and mixed wastes was initially developed and patented by Brookhaven National Laboratory (BNL) in the mid-1980s (Kalb and Colombo, 1985; …
Date: August 22, 2001
Creator: Kalb, P.
System: The UNT Digital Library
Atlanta's Kent Igleheart Brings Home 2001 Outstanding Coordinator Award: Clean Cities Alternative Fuel Information Series Fact Sheet (open access)

Atlanta's Kent Igleheart Brings Home 2001 Outstanding Coordinator Award: Clean Cities Alternative Fuel Information Series Fact Sheet

Fact sheet includes an overview of the accomplishments of Atlanta's Clean Cities coordinator Kent Igleheart, who received the 2001 Outstanding Coordinator Award.
Date: August 21, 2001
Creator: LaRocque, T.
System: The UNT Digital Library