Resource Type

Benefits of Parallel I/O in Ab Initio Nuclear Physics Calculations, ICCS 2009 Proceedings (open access)

Benefits of Parallel I/O in Ab Initio Nuclear Physics Calculations, ICCS 2009 Proceedings

Many modern scientific applications rely on highly parallel calculations, which scale to 10's of thousands processors. However, most applications do not concentrate on parallelizing input/output operations. In particular, sequential I/O has been identified as a bottleneck for the highly scalable MFDn (Many Fermion Dynamics for nuclear structure) code performing ab initio nuclear structure calculations. In this paper, we develop interfaces and parallel I/O procedures to use a well-known parallel I/O library in MFDn. As a result, we gain efficient input/output of large datasets along with their portability and ease of use in the downstream processing.
Date: May 20, 2009
Creator: Laghave, Nikhil; Sosonkina, Masha; Maris, Pieter & Vary, James P.
System: The UNT Digital Library
Electronic Structure Calculations and Adaptation Scheme in Multi-core Computing Environments (open access)

Electronic Structure Calculations and Adaptation Scheme in Multi-core Computing Environments

Multi-core processing environments have become the norm in the generic computing environment and are being considered for adding an extra dimension to the execution of any application. The T2 Niagara processor is a very unique environment where it consists of eight cores having a capability of running eight threads simultaneously in each of the cores. Applications like General Atomic and Molecular Electronic Structure (GAMESS), used for ab-initio molecular quantum chemistry calculations, can be good indicators of the performance of such machines and would be a guideline for both hardware designers and application programmers. In this paper we try to benchmark the GAMESS performance on a T2 Niagara processor for a couple of molecules. We also show the suitability of using a middleware based adaptation algorithm on GAMESS on such a multi-core environment.
Date: May 20, 2009
Creator: Seshagiri, Lakshminarasimhan; Sosonkina, Masha & Zhang, Zhao
System: The UNT Digital Library
CHAPTER 7. BERYLLIUM ANALYSIS BY NON-PLASMA BASED METHODS (open access)

CHAPTER 7. BERYLLIUM ANALYSIS BY NON-PLASMA BASED METHODS

The most common method of analysis for beryllium is inductively coupled plasma atomic emission spectrometry (ICP-AES). This method, along with inductively coupled plasma mass spectrometry (ICP-MS), is discussed in Chapter 6. However, other methods exist and have been used for different applications. These methods include spectroscopic, chromatographic, colorimetric, and electrochemical. This chapter provides an overview of beryllium analysis methods other than plasma spectrometry (inductively coupled plasma atomic emission spectrometry or mass spectrometry). The basic methods, detection limits and interferences are described. Specific applications from the literature are also presented.
Date: April 20, 2009
Creator: Ekechukwu, A
System: The UNT Digital Library
Unmanned Systems Integrated Roadmap: Fiscal Years 2009-2034 (open access)

Unmanned Systems Integrated Roadmap: Fiscal Years 2009-2034

Biennial report describing progress and changes in unmanned systems technology used by the military, with a 25-year strategic plan to describe goals for the continued development, production, testing, training, operation, and sustainment of the technologies. "This is the second edition of the integrated Office of the Secretary of Defense Unmanned Systems Roadmap (2009-2034) that includes Unmanned Aircraft systems, Unmanned Ground systems and Unmanned Maritime Systems. This Roadmap provides Defense-wide vision for unmanned systems and related technologies" (p. iii).
Date: April 20, 2009
Creator: United States. Department of Defense.
System: The UNT Digital Library
Collective phenomena in non-central nuclear collisions (open access)

Collective phenomena in non-central nuclear collisions

Recent developments in the field of anisotropic flow in nuclear collision are reviewed. The results from the top AGS energy to the top RHIC energy are discussed with emphasis on techniques, interpretation, and uncertainties in the measurements.
Date: October 20, 2008
Creator: Voloshin, Sergei A.; Poskanzer, Arthur M. & Snellings, Raimond
System: The UNT Digital Library
Genomic Prospecting for Microbial Biodiesel Production (open access)

Genomic Prospecting for Microbial Biodiesel Production

Biodiesel is defined as fatty acid mono-alkylesters and is produced from triacylglycerols. In the current article we provide an overview of the structure, diversity and regulation of the metabolic pathways leading to intracellular fatty acid and triacylglycerol accumulation in three types of organisms (bacteria, algae and fungi) of potential biotechnological interest and discuss possible intervention points to increase the cellular lipid content. The key steps that regulate carbon allocation and distribution in lipids include the formation of malonyl-CoA, the synthesis of fatty acids and their attachment onto the glycerol backbone, and the formation of triacylglycerols. The lipid biosynthetic genes and pathways are largely known for select model organisms. Comparative genomics allows the examination of these pathways in organisms of biotechnological interest and reveals the evolution of divergent and yet uncharacterized regulatory mechanisms. Utilization of microbial systems for triacylglycerol and fatty acid production is in its infancy; however, genomic information and technologies combined with synthetic biology concepts provide the opportunity to further exploit microbes for the competitive production of biodiesel.
Date: March 20, 2008
Creator: Lykidis, Athanasios; Lykidis, Athanasios & Ivanova, Natalia
System: The UNT Digital Library
Hydrogen Outgassing from Lithium Hydride (open access)

Hydrogen Outgassing from Lithium Hydride

Lithium hydride is a nuclear material with a great affinity for moisture. As a result of exposure to water vapor during machining, transportation, storage and assembly, a corrosion layer (oxide and/or hydroxide) always forms on the surface of lithium hydride resulting in the release of hydrogen gas. Thermodynamically, lithium hydride, lithium oxide and lithium hydroxide are all stable. However, lithium hydroxides formed near the lithium hydride substrate (interface hydroxide) and near the sample/vacuum interface (surface hydroxide) are much less thermally stable than their bulk counterpart. In a dry environment, the interface/surface hydroxides slowly degenerate over many years/decades at room temperature into lithium oxide, releasing water vapor and ultimately hydrogen gas through reaction of the water vapor with the lithium hydride substrate. This outgassing can potentially cause metal hydriding and/or compatibility issues elsewhere in the device. In this chapter, the morphology and the chemistry of the corrosion layer grown on lithium hydride (and in some cases, its isotopic cousin, lithium deuteride) as a result of exposure to moisture are investigated. The hydrogen outgassing processes associated with the formation and subsequent degeneration of this corrosion layer are described. Experimental techniques to measure the hydrogen outgassing kinetics from lithium hydride and methods employing …
Date: April 20, 2006
Creator: Dinh, L. N.; Schildbach, M. A.; Smith, R. A.; Balazs, B. & McLean, W., II
System: The UNT Digital Library
Reports - DOD (open access)

Reports - DOD

Reports - DOD Medical Joint Cross - Service Group - Military Value Report - April 26, 2005
Date: March 20, 2006
Creator: United States. Department of Defense.
System: The UNT Digital Library
The 2nd HOLT CAT Symposium on Excellence in Ranch Management (open access)

The 2nd HOLT CAT Symposium on Excellence in Ranch Management

This document consist of information about the Ranch Management Conference presented by King Ranch Institute for Ranch Management (KRIRM) program.
Date: October 20, 2005
Creator: King Ranch Institute for Ranch Management
System: The Portal to Texas History
BRAC Press Release: 2005 Base Closure and Realignment Commission Report Delivered to the President (open access)

BRAC Press Release: 2005 Base Closure and Realignment Commission Report Delivered to the President

Release announcing details of the delivery of the BRAC Commission Final Report to the President for his approval.
Date: October 20, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
BRAC Commission Base Visit Report for Navy Broadway Complex dtd 08/05/05 (open access)

BRAC Commission Base Visit Report for Navy Broadway Complex dtd 08/05/05

BRAC Commission Base Visit Report for Navy Broadway Complex dtd 08/05/05
Date: September 20, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
Storing Waste in Ceramic (open access)

Storing Waste in Ceramic

Not all the nuclear waste destined for Yucca Mountain is in the form of spent fuel. Some of it will be radioactive waste generated from the production of nuclear weapons. This so-called defense waste exists mainly as corrosive liquids and sludge in underground tanks. An essential task of the U.S. high-level radioactive waste program is to process these defense wastes into a solid material--called a waste form. An ideal waste form would be extremely durable and unreactive with other repository materials. It would be simple to fabricate remotely so that it could be safely transported to a repository for permanent storage. What's more, the material should be able to tolerate exposure to intense radiation without degradation. And to minimize waste volume, the material must be able to contain high concentrations of radionuclides. The material most likely to be used for immobilization of radioactive waste is glass. Glasses are produced by rapid cooling of high-temperature liquids such that the liquid-like non-periodic structure is preserved at lower temperatures. This rapid cooling does not allow enough time for thermodynamically stable crystalline phases (mineral species) to form. In spite of their thermodynamic instability, glasses can persist for millions of years. An alternate to glass …
Date: July 20, 2004
Creator: Bourcier, W. L. & Sickafus, K.
System: The UNT Digital Library
Department of Energy's Pantex Plant Saves $10 Million in Energy Costs. Federal Energy Management Program (FEMP) ESPC Case Study Fact Sheet (open access)

Department of Energy's Pantex Plant Saves $10 Million in Energy Costs. Federal Energy Management Program (FEMP) ESPC Case Study Fact Sheet

This two-page case study describes how the U.S. Department of Energy's Pantex Plant in Amarillo, Texas, will save approximately $10 million in energy costs over the next 18 years, thanks to a DOE Super Energy Savings Performance Contract (Super ESPC) delivery order for energy efficiency improvements. The delivery order is the largest to date for a DOE facility. Primarily, the delivery order calls for a new, state-of-the-art energy management control system and a new water/steam piping system, which will be purchased and installed by the contracting energy services company (ESCO). The ESCO will then be repaid over the life of the contract out of the plant's resulting energy cost savings.
Date: November 20, 2001
Creator: Ward, C.
System: The UNT Digital Library
Advanced Technology and Alternative Fuel Vehicles (open access)

Advanced Technology and Alternative Fuel Vehicles

This fact sheet provides a basic overview of today's alternative fuel choices--including biofuels, biodiesel, electricity, and hydrogen--alternative fuel vehicles, and advanced vehicle technology, such as hybrid electric vehicles, fuel cells and advanced drive trains.
Date: August 20, 2001
Creator: Tuttle, J.
System: The UNT Digital Library
Forest Products -- Industry of the Future (open access)

Forest Products -- Industry of the Future

This 8-page brochure describes the partnership between the forest products industry and DOE's Office of Industrial Technologies. It highlights the benefits to industry of working with the Forest Products Industry of the Future Team to reduce energy consumption and lower costs.
Date: November 20, 2000
Creator: unknown
System: The UNT Digital Library
Financing an Energy-Efficient Home: Energy Efficiency and Renewable Energy Clearinghouse (EREC) Fact Sheet (open access)

Financing an Energy-Efficient Home: Energy Efficiency and Renewable Energy Clearinghouse (EREC) Fact Sheet

This report is a fact sheet that explains the basics of energy-efficient home financing.
Date: September 20, 2000
Creator: Waggoner, T.
System: The UNT Digital Library
Providing Energy Efficiency and Cost Savings for U.S. Industry: Industries of the Future BestPractices Fact Sheet (open access)

Providing Energy Efficiency and Cost Savings for U.S. Industry: Industries of the Future BestPractices Fact Sheet

This 2-page fact sheet describes the Office of Industrial Technologies BestPractices program activities and services.
Date: September 20, 2000
Creator: unknown
System: The UNT Digital Library
Texas State Office of Risk Management Requests for Legislative Appropriations: Fiscal Years 2002 and 2003 (open access)

Texas State Office of Risk Management Requests for Legislative Appropriations: Fiscal Years 2002 and 2003

A legislative appropriation request for the biennium 2002-2003, in order to provide more effective claims administration and risk management services and ultimately result in savings to state agencies in the form of reduced workers' compensation claims and costs, reduced insurance purchases and improved insurance coverages, and more effective risk management programs.
Date: September 20, 2000
Creator: Texas. State Office of Risk Management.
System: The Portal to Texas History
A quick guide to solar electricity (open access)

A quick guide to solar electricity

A small brochure about solar electricity for the general public to be handed out on Earth Day 2000.
Date: March 20, 2000
Creator: Poole, L.
System: The UNT Digital Library