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STATUS OF THE DEVELOPMENT OF IN-TANK/AT-TANK SEPARATIONS TECHNOLOGIES FOR FOR HIGH-LEVEL WASTE PROCESSING FOR THE U.S. DEPARTMENT OF ENERGY
Within the U.S. Department of Energy's (DOE) Office of Technology Innovation and Development, the Office of Waste Processing manages a research and development program related to the treatment and disposition of radioactive waste. At the Savannah River (South Carolina) and Hanford (Washington) Sites, approximately 90 million gallons of waste are distributed among 226 storage tanks (grouped or collocated in 'tank farms'). This waste may be considered to contain mixed and stratified high activity and low activity constituent waste liquids, salts and sludges that are collectively managed as high level waste (HLW). A large majority of these wastes and associated facilities are unique to the DOE, meaning many of the programs to treat these materials are 'first-of-a-kind' and unprecedented in scope and complexity. As a result, the technologies required to disposition these wastes must be developed from basic principles, or require significant re-engineering to adapt to DOE's specific applications. Of particular interest recently, the development of In-tank or At-Tank separation processes have the potential to treat waste with high returns on financial investment. The primary objective associated with In-Tank or At-Tank separation processes is to accelerate waste processing. Insertion of the technologies will (1) maximize available tank space to efficiently support …
Date:
September 19, 2011
Creator:
Aaron, G. & Wilmarth, B.
Object Type:
Article
System:
The UNT Digital Library
A Change in the Optical Polarization Associated with a Gamma-Ray Flare in the Blazar 3C 279
It is widely accepted that strong and variable radiation detected over all accessible energy bands in a number of active galaxies arises from a relativistic, Doppler-boosted jet pointing close to our line of sight. The size of the emitting zone and the location of this region relative to the central supermassive black hole are, however, poorly known, with estimates ranging from light-hours to a light-year or more. Here we report the coincidence of a gamma ({gamma})-ray flare with a dramatic change of optical polarization angle. This provides evidence for co-spatiality of optical and {gamma}-ray emission regions and indicates a highly ordered jet magnetic field. The results also require a non-axisymmetric structure of the emission zone, implying a curved trajectory for the emitting material within the jet, with the dissipation region located at a considerable distance from the black hole, at about 10{sup 5} gravitational radii.
Date:
August 19, 2011
Creator:
Abdo, A. A.
Object Type:
Article
System:
The UNT Digital Library
Fermi-LAT Discovery of GeV Gamma-ray Emission from the Young Supernova Remnant Cassiopeia A
We report on the first detection of GeV high-energy gamma-ray emission from a young supernova remnant with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope. These observations reveal a source with no discernible spatial extension detected at a significance level of 12.2{sigma} above 500 MeV at a location that is consistent with the position of the remnant of the supernova explosion that occurred around 1680 in the Cassiopeia constellation - Cassiopeia A. The gamma-ray flux and spectral shape of the source are consistent with a scenario in which the gamma-ray emission originates from relativistic particles accelerated in the shell of this remnant. The total content of cosmic rays (electrons and protons) accelerated in Cas A can be estimated as W{sub CR} {approx_equal} (1-4) x 10{sup 49} erg thanks to the well-known density in the remnant assuming that the observed gamma-ray originates in the SNR shell(s). The magnetic field in the radio-emitting plasma can be robustly constrained as B {ge} 0.1 mG, providing new evidence of the magnetic field amplification at the forward shock and the strong field in the shocked ejecta.
Date:
August 19, 2011
Creator:
Abdo, A. A.
Object Type:
Article
System:
The UNT Digital Library
The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called 'extra-galactic' diffuse {gamma}-ray emission (EGB). This component of the diffuse {gamma}-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse contributions discussed in the literature. The derivation of the EGB is based on detailed modelling of the bright foreground diffuse Galactic {gamma}-ray emission (DGE), the detected LAT sources and the solar {gamma}-ray emission. We find the spectrum of the EGB is consistent with a power law with differential spectral index {gamma} = 2.41 {+-} 0.05 and intensity, I(> 100 MeV) = (1.03 {+-} 0.17) x 10{sup -5} cm{sup -2} s{sup -1} sr{sup -1}, where the error is systematics dominated. Our EGB spectrum is featureless, less intense, and softer than that derived from EGRET data.
Date:
August 19, 2011
Creator:
Abdo, A. A.
Object Type:
Article
System:
The UNT Digital Library
Building Your Congregation Over the Long Haul - Things Learned After 33 Years with One Church
Lecture given Monday, September 19, 2011, 9:00 AM at Abilene Christian University: "There is a lot to consider in leading a church – leadership, growth, community, spiritual formation, outreach. All of us are still learning. Discover lessons learned from both successes and failures in leading a church."
Date:
September 19, 2011
Creator:
Adcox, Jimmy
Object Type:
Sound
System:
The Portal to Texas History
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations.
Date:
January 19, 2011
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
U.S. Security Assistance to Lebanon
This report discusses key issues facing U.S. policy makers and members of Congress when considering U.S. security assistance in the context of U.S. policy toward Lebanon. These key issues include assessing the effectiveness of U.S. assistance programs, assessing overall U.S. policy toward Lebanon, and managing relations with other external actors.
Date:
January 19, 2011
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Finding Enough - Sabbath Keeping in the 21st Century
Lecture given Monday, September 19, 2011, 9:00 AM at Abilene Christian University: "Is everyday a whirlwind of activity? Are you so busy working for God that you no longer feel near God? It must be time for Sabbath. Join us as we explore the why and how of contemporary Sabbath keeping."
Date:
September 19, 2011
Creator:
Agnell, Cynthia
Object Type:
Sound
System:
The Portal to Texas History
A Solid-State Nanosecond Beam Kicker Modulator Based on the DSRD Switch
A fast solid-state beam kicker modulator is under development at the SLAC National Accelerator Laboratory. The program goal is to develop a modulator that will deliver 4 ns, {+-}5 kV pulses to the ATF2 damping ring beam extraction kicker. The kicker is a 50 {Omega}, bipolar strip line, 60 cm long, fed at the downstream end and terminated at the upstream end. The bunch spacing in the ring is 5.6 ns, bunches are removed from the back end of the train, and there is a gap of 103.6 ns before the next train. The modulator design is based on an opening switch topology that uses Drift Step Recovery Diodes as the opening switches. The design and results of the modulator development are discussed. There are many applications that benefit from very fast high power switching. However, at MW power levels and nanosecond time scales, solid state options are limited. One option, the Drift Step Recovery Diode (DSRD) has been demonstrated as capable of blocking thousands of volts and switching in nanosecond to sub-nanosecond ranges. When used as an opening switch, the DSRD exhibits a very fast turn off transient. The process is described in detail by its pioneers in [5,6]. …
Date:
August 19, 2011
Creator:
Akre, R.; Benwell, A.; Burkhart, C.; Krasnykh, A.; Tang, T. & Kardo-Sysoev, A.
Object Type:
Article
System:
The UNT Digital Library
Breakdown of the Onsager Principle as a Sign of Aging
Article discussing the breakdown of the Onsager principle as a sign of aging.
Date:
July 19, 2011
Creator:
Allegrini, Paolo; Aquino, Gerardo; Grigolini, Paolo; Palatella, Luigi & Rosa, Angelo
Object Type:
Article
System:
The UNT Digital Library
Deaf Ministry Classes - Bible Knowledge for the deaf Christian
Lecture given Monday, September 19, 2011, 10:00 AM at Abilene Christian University: "Special topics and methods for enhancing general Bible knowledge for the Deaf. Special emphasis on the Old Testament."
Date:
September 19, 2011
Creator:
Anderson, Bob
Object Type:
Sound
System:
The Portal to Texas History
Talking Back to God - Learning the Language
Lecture given Monday, September 19, 2011, 9:00 AM at Abilene Christian University: "Learn how to pour out your heart to God through the Psalms. Powerful yet practical benefits can come through reading, singing, praying and memorizing the Psalms."
Date:
September 19, 2011
Creator:
Anderson, Lynn
Object Type:
Sound
System:
The Portal to Texas History
Weekly NIF Progress Report; Summary of NIF System Shots for the Week of July 10 - July 16, 2011
None
Date:
July 19, 2011
Creator:
Baisden, P
Object Type:
Report
System:
The UNT Digital Library
The Rambler (Fort Worth, Tex.), Vol. 94, No. 1, Ed. 1 Wednesday, January 19, 2011
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
January 19, 2011
Creator:
Banks, Shauna
Object Type:
Newspaper
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 94, No. 20, Ed. 1 Wednesday, October 19, 2011
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
October 19, 2011
Creator:
Banks, Shauna
Object Type:
Newspaper
System:
The Portal to Texas History
Davis v. United States: Retroactivity and the Good-Faith Exception to the Exclusionary Rule
This report covers the legal causes and implications of Davis v. United States. The Supreme Court will consider whether evidence that was seized in violation of the defendant’s Fourth Amendment rights is admissible at trial because the police seized the evidence in good-faith reliance on then-controlling case law.
Date:
April 19, 2011
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
Seek Justice - The Heart of God
Lecture given Monday, September 19, 2011, 4:00 PM at Abilene Christian University: "International Justice Mission is a Christian human rights agency answering Isaiah's call to seek justice by securing rescue and recovery for victims of sex trafficking, slavery, and other violent oppression. Join this class to learn and to be mobilized for action."
Date:
September 19, 2011
Creator:
Barnard, Wayne
Object Type:
Sound
System:
The Portal to Texas History
Characterization of the effects of x-ray irradiation on the hierarchical structure and mechanical properties of human cortical bone
Bone comprises a complex structure of primarily collagen, hydroxyapatite and water, where each hierarchical structural level contributes to its strength, ductility and toughness. These properties, however, are degraded by irradiation, arising from medical therapy or bone-allograft sterilization. We provide here a mechanistic framework for how irradiation affects the nature and properties of human cortical bone over a range of characteristic (nano to macro) length-scales, following x-ray exposures up to 630 kGy. Macroscopically, bone strength, ductility and fracture resistance are seen to be progressively degraded with increasing irradiation levels. At the micron-scale, fracture properties, evaluated using in-situ scanning electron microscopy and synchrotron x-ray computed micro-tomography, provide mechanistic information on how cracks interact with the bone-matrix structure. At sub-micron scales, strength properties are evaluated with in-situ tensile tests in the synchrotron using small-/wide-angle x-ray scattering/diffraction, where strains are simultaneously measured in the macroscopic tissue, collagen fibrils and mineral. Compared to healthy bone, results show that the fibrillar strain is decreased by ~40% following 70 kGy exposures, consistent with significant stiffening and degradation of the collagen. We attribute the irradiation-induced deterioration in mechanical properties to mechanisms at multiple length-scales, including changes in crack paths at micron-scales, loss of plasticity from suppressed fibrillar sliding …
Date:
August 19, 2011
Creator:
Barth, Holly; Zimmermann, Elizabeth; Schaible, Eric; Tang, Simon; Alliston, Tamara & Ritchie, Robert
Object Type:
Article
System:
The UNT Digital Library
Unclean: The Psychology of Missional Failure, Part 1
Lecture given Monday, September 19, 2011, 9:00 AM at Abilene Christian University: "Why do churches struggle to follow Jesus as he breaks bread with 'tax collectors and sinners?' One answer highlights the psychological tensions between 'purity' and 'hospitality.' Come hear Beck discuss his recent book on the psychology of missional failure."
Date:
September 19, 2011
Creator:
Beck, Richard
Object Type:
Sound
System:
The Portal to Texas History
Common Origin of the Circular-dichroism Pattern in ARPES of SrTiO3 and CuxBi2Se3
We investigate circular dichroism in the angular distribution (CDAD) of photoelectrons from SrTiO{sub 3}:Nb and Cu{sub x}Bi{sub 2}Se{sub 3} recorded by 7-eV laser ARPES. In addition to the well-known node that occurs in CDAD when the incidence plane matches the mirror plane of the crystal, we show that another type of node occurs when the mirror plane of the crystal is vertical to the incidence plane and the electronic state is two dimensional. The flower-shaped CDAD's occurring around the Fermi level of SrTiO{sub 3}:Nb and around the Dirac point of Cu{sub x}Bi{sub 2}Se{sub 3} are explained on equal footings. A surface-state-to-surface-resonance transition is indicated for the topological state of Cu{sub x}Bi{sub 2}Se{sub 3}.
Date:
August 19, 2011
Creator:
Bell, Christopher
Object Type:
Article
System:
The UNT Digital Library
Control of Electronic Conduction at an Oxide Heterointerface using Surface Polar Adsorbates
We study the effect of the surface adsorption of a variety of common laboratory solvents on the conductivity at the interface between LaAlO{sub 3} and SrTiO{sub 3}. This interface possesses a range of intriguing physics, notably a proposed connection between the surface state of the LaAlO{sub 3} and the conductivity buried in the SrTiO{sub 3}. We show that the application of chemicals such as acetone, ethanol, and water can induce a large change (factor of three) in the conductivity. This phenomenon is observed only for polar solvents. These data provide experimental evidence for a general polarization-facilitated electronic transfer mechanism.
Date:
August 19, 2011
Creator:
Bell, Christopher
Object Type:
Article
System:
The UNT Digital Library
Intrinsic Spin-Orbit Coupling in Superconducting Delta-Doped SrTiO3 Heterostructures
We report the violation of the Pauli limit due to intrinsic spin-orbit coupling in SrTiO{sub 3} heterostructures. Via selective doping down to a few nanometers, a two-dimensional superconductor is formed, geometrically suppressing orbital pair-breaking. The spin-orbit scattering is exposed by the robust in-plane superconducting upper critical field, exceeding the Pauli limit by a factor of 4. Transport scattering times several orders of magnitude higher than for conventional thin film superconductors enables a new regime to be entered, where spin-orbit coupling effects arise non-perturbatively.
Date:
August 19, 2011
Creator:
Bell, Christopher
Object Type:
Article
System:
The UNT Digital Library
Structural Comparison of n-type and p-type LaAlO3/SrTiO3 Interfaces
Using a surface x-ray diffraction technique, we investigated the atomic structure of two types of interfaces between LaAlO{sub 3} and SrTiO{sub 3}, that is, p-type (SrO/AlO{sub 2}) and n-type (TiO{sub 2}/LaO) interfaces. Our results demonstrate that the SrTiO{sub 3} in the sample with the n-type interface has a large polarized region, while that with the p-type interface has a limited polarized region. In addition, the atomic intermixing was observed to extend deeper into STO substrate at the n-type interface than at the p-type. These differences result in different degrees of band bending, which likely contributes to the striking difference in electrical conductivity between the two types of interfaces.
Date:
August 19, 2011
Creator:
Bell, Christopher
Object Type:
Article
System:
The UNT Digital Library
N >= 4 Supergravity Amplitudes from Gauge Theory at One Loop
We expose simple and practical relations between the integrated four- and five-point one-loop amplitudes of N {ge} 4 supergravity and the corresponding (super-)Yang-Mills amplitudes. The link between the amplitudes is simply understood using the recently uncovered duality between color and kinematics that leads to a double-copy structure for gravity. These examples provide additional direct confirmations of the duality and double-copy properties at loop level for a sample of different theories.
Date:
August 19, 2011
Creator:
Bern, Z.; Boucher-Veronneau, C. & Johansson, H.
Object Type:
Article
System:
The UNT Digital Library