Resource Type

Exceptional groups, symmetric spaces and applications (open access)

Exceptional groups, symmetric spaces and applications

In this article we provide a detailed description of a technique to obtain a simple parameterization for different exceptional Lie groups, such as G{sub 2}, F{sub 4} and E{sub 6}, based on their fibration structure. For the compact case, we construct a realization which is a generalization of the Euler angles for SU(2), while for the non compact version of G{sub 2(2)}/SO(4) we compute the Iwasawa decomposition. This allows us to obtain not only an explicit expression for the Haar measure on the group manifold, but also for the cosets G{sub 2}/SO(4), G{sub 2}/SU(3), F{sub 4}/Spin(9), E{sub 6}/F{sub 4} and G{sub 2(2)}/SO(4) that we used to find the concrete realization of the general element of the group. Moreover, as a by-product, in the simplest case of G{sub 2}/SO(4), we have been able to compute an Einstein metric and the vielbein. The relevance of these results in physics is discussed.
Date: March 31, 2009
Creator: Cerchiai, Bianca L. & Cacciatori, Sergio L.
System: The UNT Digital Library
FCC Record, Volume 24, No. 4, Pages 2572 to 3518, February 27 - March 20, 2009 (open access)

FCC Record, Volume 24, No. 4, Pages 2572 to 3518, February 27 - March 20, 2009

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2009
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
Fluid effects on seismic waves in hard rocks with fractures and in soft granular media (open access)

Fluid effects on seismic waves in hard rocks with fractures and in soft granular media

When fractures in otherwise hard rocks are filled with fluids (oil, gas, water, CO{sub 2}), the type and physical state of the fluid (liquid or gas) can make a large difference in the wave speeds and attenuation properties of seismic waves. The present work summarizes methods of deconstructing theses effects of fractures, together with any fluids contained within them, on wave propagation as observed in reflection seismic data. Additional studies of waves in fluid-saturated granular media show that the behavior can be quite different from that for fractured media, since these materials are typically much softer mechanically than are the fractured rocks (i.e., having a very small drained moduli). Important fluid effects in such media are often governed as much by fluid viscosity as by fluid bulk modulus.
Date: March 1, 2009
Creator: Berryman, James G.
System: The UNT Digital Library
Mass Transport within Soils (open access)

Mass Transport within Soils

Contaminants in soil can impact human health and the environment through a complex web of interactions. Soils exist where the atmosphere, hydrosphere, geosphere, and biosphere converge. Soil is the thin outer zone of the earth's crust that supports rooted plants and is the product of climate and living organisms acting on rock. A true soil is a mixture of air, water, mineral, and organic components. The relative proportions of these components determine the value of the soil for agricultural and for other human uses. These proportions also determine, to a large extent, how a substance added to soil is transported and/or transformed within the soil (Spositio, 2004). In mass-balance models, soil compartments play a major role, functioning both as reservoirs and as the principal media for transport among air, vegetation, surface water, deeper soil, and ground water (Mackay, 2001). Quantifying the mass transport of chemicals within soil and between soil and atmosphere is important for understanding the role soil plays in controlling fate, transport, and exposure to multimedia pollutants. Soils are characteristically heterogeneous. A trench dug into soil typically reveals several horizontal layers having different colors and textures. As illustrated in Figure 1, these multiple layers are often divided into …
Date: March 1, 2009
Creator: McKone, Thomas E.
System: The UNT Digital Library
Primary Care Case Management Primary Care Provider and Hospital List: Southeast Texas, March 2009 (open access)

Primary Care Case Management Primary Care Provider and Hospital List: Southeast Texas, March 2009

List of Primary Care Case Management program approved primary care providers, hospitals, specialists, and family planning providers, located in the Southeast Texas area.
Date: March 2009
Creator: Primary Care Case Management
System: The Portal to Texas History
Texas Guaranteed Tuition Plan Student Handbook: 2009 (open access)

Texas Guaranteed Tuition Plan Student Handbook: 2009

Annual handbook documenting information for college students about the Texas Guaranteed Tuition Plan, including general information about the program and how it works, fees and scholarships, how the plan applies to various institutions, and other information about using the program.
Date: March 2009
Creator: Texas Prepaid Higher Education Tuition Board
System: The Portal to Texas History
Optics and multilayer coatings for EUVL systems (open access)

Optics and multilayer coatings for EUVL systems

EUV lithography (EUVL) employs illumination wavelengths around 13.5 nm, and in many aspects it is considered an extension of optical lithography, which is used for the high-volume manufacturing (HVM) of today's microprocessors. The EUV wavelength of illumination dictates the use of reflective optical elements (mirrors) as opposed to the refractive lenses used in conventional lithographic systems. Thus, EUVL tools are based on all-reflective concepts: they use multilayer (ML) coated optics for their illumination and projection systems, and they have a ML-coated reflective mask.
Date: March 21, 2008
Creator: Soufli, R.; Bajt, S.; Hudyma, R. M. & Taylor, J. S.
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
FCC Record, Volume 23, No. 5, Pages 3504 to 4464, March 3 - March 14, 2008 (open access)

FCC Record, Volume 23, No. 5, Pages 3504 to 4464, March 3 - March 14, 2008

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2008
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
FCC Record, Volume 23, No. 6, Pages 4465 to 5426, March 17 - March 28, 2008 (open access)

FCC Record, Volume 23, No. 6, Pages 4465 to 5426, March 17 - March 28, 2008

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2008
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
Instructions to Police for Reporting Crashes (open access)

Instructions to Police for Reporting Crashes

"This manual is a tool to facilitate the implementation of the Crash Records Information System (CRIS) in Texas and to guide peace officers in the completion of the Texas Peace Officer's Crash Report and the Commercial Motor Vehicle Supplement to the Texas Peace Officer's Crash Report" (p. 1)
Date: March 2008
Creator: Texas. Department of Transportation.
System: The Portal to Texas History
The Texas State Securities Board and the Texas Investor (open access)

The Texas State Securities Board and the Texas Investor

"This brochure has been prepared by the staff of the Texas State Securities Board (the "Agency") to provide a brief introduction to the Agency and how it functions, and to give practical suggestions to investors about how to protect themselves from fraud" (Mission of Texas State Securities Board page).
Date: March 2008
Creator: Texas. State Securities Board.
System: The Portal to Texas History
Interactive Volume Rendering of Diffusion Tensor Data (open access)

Interactive Volume Rendering of Diffusion Tensor Data

As 3D volumetric images of the human body become an increasingly crucial source of information for the diagnosis and treatment of a broad variety of medical conditions, advanced techniques that allow clinicians to efficiently and clearly visualize volumetric images become increasingly important. Interaction has proven to be a key concept in analysis of medical images because static images of 3D data are prone to artifacts and misunderstanding of depth. Furthermore, fading out clinically irrelevant aspects of the image while preserving contextual anatomical landmarks helps medical doctors to focus on important parts of the images without becoming disoriented. Our goal was to develop a tool that unifies interactive manipulation and context preserving visualization of medical images with a special focus on diffusion tensor imaging (DTI) data. At each image voxel, DTI provides a 3 x 3 tensor whose entries represent the 3D statistical properties of water diffusion locally. Water motion that is preferential to specific spatial directions suggests structural organization of the underlying biological tissue; in particular, in the human brain, the naturally occuring diffusion of water in the axon portion of neurons is predominantly anisotropic along the longitudinal direction of the elongated, fiber-like axons [MMM+02]. This property has made DTI …
Date: March 30, 2007
Creator: Hlawitschka, Mario; Weber, Gunther; Anwander, Alfred; Carmichael, Owen; Hamann, Bernd & Scheuermann, Gerik
System: The UNT Digital Library
FCC Record, Volume 22, No. 6, Pages 3365 to 4338, February 20 - March 2, 2007 (open access)

FCC Record, Volume 22, No. 6, Pages 3365 to 4338, February 20 - March 2, 2007

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2007
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
FCC Record, Volume 22, No. 7, Pages 4339 to 5281, March 5 - March 16, 2007 (open access)

FCC Record, Volume 22, No. 7, Pages 4339 to 5281, March 5 - March 16, 2007

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2007
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
FCC Record, Volume 22, No. 8, Pages 5282 to 6289, March 19 - March 29, 2007 (open access)

FCC Record, Volume 22, No. 8, Pages 5282 to 6289, March 19 - March 29, 2007

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2007
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
Texas Guaranteed Tuition Plan Student Handbook: 2007 (open access)

Texas Guaranteed Tuition Plan Student Handbook: 2007

Annual handbook documenting information for college students about the Texas Guaranteed Tuition Plan, including general information about the program and how it works, fees and scholarships, how the plan applies to various institutions, and other information about using the program.
Date: March 2007
Creator: Texas Prepaid Higher Education Tuition Board
System: The Portal to Texas History
BRAC Commission Material – BRAC Staff Support Handbook 2006 (open access)

BRAC Commission Material – BRAC Staff Support Handbook 2006

BRAC Commission Material – BRAC Staff Support Handbook 2006. 177 page document dated April 2006
Date: March 30, 2006
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
2005 BRAC Commission Final COBRA Run - Tab 3 INTEL-0010 COBRA Reports (open access)

2005 BRAC Commission Final COBRA Run - Tab 3 INTEL-0010 COBRA Reports

2005 BRAC Commission Final COBRA Run - Tab 3 INTEL-0010 COBRA Reports - 167 - Defense Intelligence Agency
Date: March 28, 2006
Creator: United States. Defense Base Closure and Realignment Commission.
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
FCC Record, Volume 21, No. 3, Pages 1870 to 2901, February 27 - March 17, 2006 (open access)

FCC Record, Volume 21, No. 3, Pages 1870 to 2901, February 27 - March 17, 2006

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2006
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
FCC Record, Volume 20, No. 6, Pages 3944 to 4940, February 22 - March 4, 2005 (open access)

FCC Record, Volume 20, No. 6, Pages 3944 to 4940, February 22 - March 4, 2005

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2005
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
FCC Record, Volume 20, No. 7, Pages 4941 to 5859, March 7 - March 15, 2005 (open access)

FCC Record, Volume 20, No. 7, Pages 4941 to 5859, March 7 - March 15, 2005

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2005
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library
FCC Record, Volume 20, No. 8, Pages 5860 to 6853, March 16 - March 25, 2005 (open access)

FCC Record, Volume 20, No. 8, Pages 5860 to 6853, March 16 - March 25, 2005

Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date: March 2005
Creator: United States. Federal Communications Commission.
System: The UNT Digital Library