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Defense Base Closure and Realignment Commission
367
Office of Scientific & Technical Information Technical Reports
85
Federal Communications Commission Record
71
Government Documents A to Z Digitization Project
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Texas State Publications
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USDA Farmers' Bulletins
42
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2005 BRAC Commission
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Farmers' bulletin (United States. Dept. of Agriculture)
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15
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9
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Topological Cacti: Visualizing Contour-based Statistics
Contours, the connected components of level sets, play an important role in understanding the global structure of a scalar field. In particular their nestingbehavior and topology-often represented in form of a contour tree-have been used extensively for visualization and analysis. However, traditional contour trees onlyencode structural properties like number of contours or the nesting of contours, but little quantitative information such as volume or other statistics. Here we use thesegmentation implied by a contour tree to compute a large number of per-contour (interval) based statistics of both the function defining the contour tree as well asother co-located functions. We introduce a new visual metaphor for contour trees, called topological cacti, that extends the traditional toporrery display of acontour tree to display additional quantitative information as width of the cactus trunk and length of its spikes. We apply the new technique to scalar fields ofvarying dimension and different measures to demonstrate the effectiveness of the approach.
Date:
May 26, 2011
Creator:
Weber, Gunther H.; Bremer, Peer-Timo & Pascucci, Valerio
System:
The UNT Digital Library
Bioananalytics of Human Microdosing
None
Date:
May 2, 2011
Creator:
Buchholz, B. A.; Sarachine Falso, M. J.; Stewart, B. J.; Haack, K. W.; Ognibene, T. J.; Salazar Quintero, G. A. et al.
System:
The UNT Digital Library
Catalog of Texas Tech University, 2011-2012, Undergraduate and Graduate
Catalog of undergraduate and graduate courses offered by Texas Tech University for the year 2011-2012, as well as general information about the university, programs, and policies.
Date:
May 2011
Creator:
Texas Tech University
System:
The Portal to Texas History
Composite Materials under Extreme Radiation and Temperature Environments of the Next Generation Nuclear Reactors
In the nuclear energy renaissance, driven by fission reactor concepts utilizing very high temperatures and fast neutron spectra, materials with enhanced performance that exceeds are expected to play a central role. With the operating temperatures of the Generation III reactors bringing the classical reactor materials close to their performance limits there is an urgent need to develop and qualify new alloys and composites. Efforts have been focused on the intricate relations and the high demands placed on materials at the anticipated extreme states within the next generation fusion and fission reactors which combine high radiation fluxes, elevated temperatures and aggressive environments. While nuclear reactors have been in operation for several decades, the structural materials associated with the next generation options need to endure much higher temperatures (1200 C), higher neutron doses (tens of displacements per atom, dpa), and extremely corrosive environments, which are beyond the experience on materials accumulated to-date. The most important consideration is the performance and reliability of structural materials for both in-core and out-of-core functions. While there exists a great body of nuclear materials research and operating experience/performance from fission reactors where epithermal and thermal neutrons interact with materials and alter their physio-mechanical properties, a process that …
Date:
May 1, 2011
Creator:
Simos, N.
System:
The UNT Digital Library
FCC Record, Volume 26, No. 9, Pages 6561 to 7369, May 2 - May 19, 2011
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2011
Creator:
United States. Federal Communications Commission.
System:
The UNT Digital Library
The Health Care Provider's Guide to Breastfeeding
A guide to breastfeeding care and support in the hospital and post-partum for health care providers that includes instructions for lactation, common medical problems for the mother or baby and how to address them, guidelines for pumping and general breastfeeding information ad support.
Date:
May 2011
Creator:
Texas. Department of State Health Services. Nutrition Services Section.
System:
The Portal to Texas History
Ion exchange phenomena
Ion exchange phenomena involve the population of readily exchangeable ions, the subset of adsorbed solutes that balance the intrinsic surface charge and can be readily replaced by major background electrolyte ions (Sposito, 2008). These phenomena have occupied a central place in soil chemistry research since Way (1850) first showed that potassium uptake by soils resulted in the release of an equal quantity of moles of charge of calcium and magnesium. Ion exchange phenomena are now routinely modeled in studies of soil formation (White et al., 2005), soil reclamation (Kopittke et al., 2006), soil fertilitization (Agbenin and Yakubu, 2006), colloidal dispersion/flocculation (Charlet and Tournassat, 2005), the mechanics of argillaceous media (Gajo and Loret, 2007), aquitard pore water chemistry (Tournassat et al., 2008), and groundwater (Timms and Hendry, 2007; McNab et al., 2009) and contaminant hydrology (Chatterjee et al., 2008; van Oploo et al., 2008; Serrano et al., 2009).
Date:
May 1, 2011
Creator:
Bourg, I.C. & Sposito, G.
System:
The UNT Digital Library
Automated detection and analysis of particle beams in laser-plasma accelerator simulations
Numerical simulations of laser-plasma wakefield (particle) accelerators model the acceleration of electrons trapped in plasma oscillations (wakes) left behind when an intense laser pulse propagates through the plasma. The goal of these simulations is to better understand the process involved in plasma wake generation and how electrons are trapped and accelerated by the wake. Understanding of such accelerators, and their development, offer high accelerating gradients, potentially reducing size and cost of new accelerators. One operating regime of interest is where a trapped subset of electrons loads the wake and forms an isolated group of accelerated particles with low spread in momentum and position, desirable characteristics for many applications. The electrons trapped in the wake may be accelerated to high energies, the plasma gradient in the wake reaching up to a gigaelectronvolt per centimeter. High-energy electron accelerators power intense X-ray radiation to terahertz sources, and are used in many applications including medical radiotherapy and imaging. To extract information from the simulation about the quality of the beam, a typical approach is to examine plots of the entire dataset, visually determining the adequate parameters necessary to select a subset of particles, which is then further analyzed. This procedure requires laborious examination of …
Date:
May 21, 2010
Creator:
Ushizima, Daniela Mayumi; Geddes, Cameron G.; Cormier-Michel, Estelle; Bethel, E. Wes; Jacobsen, Janet; Prabhat et al.
System:
The UNT Digital Library
Establishing Natural Product Content with the Natural Radiocarbon Signature
None
Date:
May 7, 2010
Creator:
Buchholz, B. A.; Sarachine, M. J. & Zermeno, P.
System:
The UNT Digital Library
CHAPTER 5-RADIOACTIVE WASTE MANAGEMENT
The ore pitchblende was discovered in the 1750's near Joachimstal in what is now the Czech Republic. Used as a colorant in glazes, uranium was identified in 1789 as the active ingredient by chemist Martin Klaproth. In 1896, French physicist Henri Becquerel studied uranium minerals as part of his investigations into the phenomenon of fluorescence. He discovered a strange energy emanating from the material which he dubbed 'rayons uranique.' Unable to explain the origins of this energy, he set the problem aside. About two years later, a young Polish graduate student was looking for a project for her dissertation. Marie Sklodowska Curie, working with her husband Pierre, picked up on Becquerel's work and, in the course of seeking out more information on uranium, discovered two new elements (polonium and radium) which exhibited the same phenomenon, but were even more powerful. The Curies recognized the energy, which they now called 'radioactivity,' as something very new, requiring a new interpretation, new science. This discovery led to what some view as the 'golden age of nuclear science' (1895-1945) when countries throughout Europe devoted large resources to understand the properties and potential of this material. By World War II, the potential to harness this …
Date:
May 5, 2010
Creator:
Marra, J.
System:
The UNT Digital Library
Chapter 11. Community analysis-based methods
Microbial communities are each a composite of populations whose presence and relative abundance in water or other environmental samples are a direct manifestation of environmental conditions, including the introduction of microbe-rich fecal material and factors promoting persistence of the microbes therein. As shown by culture-independent methods, different animal-host fecal microbial communities appear distinctive, suggesting that their community profiles can be used to differentiate fecal samples and to potentially reveal the presence of host fecal material in environmental waters. Cross-comparisons of microbial communities from different hosts also reveal relative abundances of genetic groups that can be used to distinguish sources. In increasing order of their information richness, several community analysis methods hold promise for MST applications: phospholipid fatty acid (PLFA) analysis, denaturing gradient gel electrophoresis (DGGE), terminal restriction fragment length polymorphism (TRFLP), cloning/sequencing, and PhyloChip. Specific case studies involving TRFLP and PhyloChip approaches demonstrate the ability of community-based analyses of contaminated waters to confirm a diagnosis of water quality based on host-specific marker(s). The success of community-based MST for comprehensively confirming fecal sources relies extensively upon using appropriate multivariate statistical approaches. While community-based MST is still under evaluation and development as a primary diagnostic tool, results presented herein demonstrate its promise. …
Date:
May 1, 2010
Creator:
Cao, Y.; Wu, C. H.; Andersen, G. L. & Holden, P. A.
System:
The UNT Digital Library
FCC Record, Volume 25, No. 7, Pages 5195 to 6155, May 17 - May 28, 2010
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2010
Creator:
United States. Federal Communications Commission.
System:
The UNT Digital Library
FCC Record, Volume 25, No. 14, Pages 11407 to 11962, Supplement (May 20, 2010)
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2010
Creator:
United States. Federal Communications Commission.
System:
The UNT Digital Library
Review and Reporting of COC Concentration Data under TRRP
This document provides the procedures for review and reporting of chemical of concern (COC) concentration data under the Texas Risk Reduction Program (TRRP).
Date:
May 2010
Creator:
Texas Commission on Environmental Quality. Remediation Division.
System:
The Portal to Texas History
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
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
Hadron Production in Heavy Ion Collisions
Heavy ion collisions are an ideal tool to explore the QCD phase diagram. The goal is to study the equation of state (EOS) and to search for possible in-medium modifications of hadrons. By varying the collision energy a variety of regimes with their specific physics interest can be studied. At energies of a few GeV per nucleon, the regime where experiments were performed first at the Berkeley Bevalac and later at the Schwer-Ionen-Synchrotron (SIS) at GSI in Darmstadt, we study the equation of state of dense nuclear matter and try to identify in-medium modifications of hadrons. Towards higher energies, the regime of the Alternating Gradient Synchrotron (AGS) at the Brookhaven National Laboratory (BNL), the Super-Proton Synchrotron (SPS) at CERN, and the Relativistic Heavy Ion Collider (RHIC) at BNL, we expect to produce a new state of matter, the Quark-Gluon Plasma (QGP). The physics goal is to identify the QGP and to study its properties. By varying the energy, different forms of matter are produced. At low energies we study dense nuclear matter, similar to the type of matter neutron stars are made of. As the energy is increased the main constituents of the matter will change. Baryon excitations will become …
Date:
May 19, 2009
Creator:
Ritter, Hans Georg & Xu, Nu
System:
The UNT Digital Library
FCC Record, Volume 24, No. 6, Pages 4423 to 5282, April 13 - May 1, 2009
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2009
Creator:
United States. Federal Communications Commission.
System:
The UNT Digital Library
FCC Record, Volume 24, No. 7, Pages 5283 to 6184, May 4 - May 22, 2009
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2009
Creator:
United States. Federal Communications Commission.
System:
The UNT Digital Library
A Guide to Freshwater Ecology, 2009 edition
A guide to freshwater ecosystems describing waters chemical properties, potential pollutants of surface waters, freshwater ecosystems and drainage basins, and common plants and animals of freshwater ecosystems in Texas.
Date:
May 2009
Creator:
Kolbe, Christine M. & Luedke, Mark
System:
The Portal to Texas History
Tribal Identifier Data Standard
This standard specifies the set of tribal names and codes necessary to constitute consistent and unambiguous identification of federally-recognized American Indian and Alaska Native entities.
Date:
May 28, 2008
Creator:
Exchange Network Leadership Council
System:
The UNT Digital Library
Atomic lifetime measurements of highly charged ions
None
Date:
May 21, 2008
Creator:
Trabert, E.
System:
The UNT Digital Library
Chapter 2: Sustainable and Unsustainable Developments in the U.S. Energy System
Over the course of the nineteenth and twentieth centuries, the United States developed a wealthy society on the basis of cheap and abundant fossil fuel energy. As fossil fuels have become ecologically and economically expensive in the twenty-first century, America has shown mixed progress in transitioning to a more sustainable energy system. From 2000 to 2006, energy and carbon intensity of GDP continued favorable long-term trends of decline. Energy end-use efficiency also continued to improve; for example, per-capita electricity use was 12.76 MWh per person per year in 2000 and again in 2006, despite 16 percent GDP growth over that period. Environmental costs of U.S. energy production and consumption have also been reduced, as illustrated in air quality improvements. However, increased fossil fuel consumption, stagnant efficiency standards, and expanding corn-based ethanol production have moved the energy system in the opposite direction, toward a less sustainable energy system. This chapter reviews energy system developments between 2000 and 2006 and presents policy recommendations to move the United States toward a more sustainable energy system.
Date:
May 1, 2008
Creator:
Levine, Mark; Levine, Mark D. & Aden, Nathaniel T.
System:
The UNT Digital Library
FCC Record, Volume 23, No. 8, Pages 6393 to 7336, April 14 - May 2, 2008
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
May 2008
Creator:
United States. Federal Communications Commission.
System:
The UNT Digital Library