Collection
Office of Scientific & Technical Information Technical Reports
692
Texas Laws and Resolutions Archive
626
Congressional Research Service Reports
514
Government Accountability Office Reports
176
Texas State Publications
54
Texas Register
20
Texas Attorney General Opinions
17
Federal Register
15
End of Term Publications
9
Texas House of Representatives Journals
5
5 More
Country
Decade
Month
Day
Language
2,126 Matching Results
Results open in a new window/tab.
Warm Water Oxidation Verification - Scoping and Stirred Reactor Tests
Scoping tests to evaluate the effects of agitation and pH adjustment on simulant sludge agglomeration and uranium metal oxidation at {approx}95 C were performed under Test Instructions(a,b) and as per sections 5.1 and 5.2 of this Test Plan prepared by AREVA. (c) The thermal testing occurred during the week of October 4-9, 2010. The results are reported here. For this testing, two uranium-containing simulant sludge types were evaluated: (1) a full uranium-containing K West (KW) container sludge simulant consisting of nine predominant sludge components; (2) a 50:50 uranium-mole basis mixture of uraninite [U(IV)] and metaschoepite [U(VI)]. This scoping study was conducted in support of the Sludge Treatment Project (STP) Phase 2 technology evaluation for the treatment and packaging of K-Basin sludge. The STP is managed by CH2M Hill Plateau Remediation Company (CHPRC) for the U.S. Department of Energy. Warm water ({approx}95 C) oxidation of sludge, followed by immobilization, has been proposed by AREVA and is one of the alternative flowsheets being considered to convert uranium metal to UO{sub 2} and eliminate H{sub 2} generation during final sludge disposition. Preliminary assessments of warm water oxidation have been conducted, and several issues have been identified that can best be evaluated through laboratory …
Date:
June 15, 2011
Creator:
Braley, Jenifer C.; Sinkov, Sergey I.; Delegard, Calvin H. & Schmidt, Andrew J.
Object Type:
Report
System:
The UNT Digital Library
Heavy Quarkonium: Progress, Puzzles, and Opportunities
None
Date:
June 15, 2012
Creator:
Brambilla, N.; Eidelman, S.; Heltsley, B. K.; Vogt, R.; Bodwin, G. T.; Eichten, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Improving the phase stability and oxidation resistance of B-NiAl
High temperature alloys are essential to many industries that require a stable material to perform in harsh oxidative environments. Many of these alloys are suited for specific applications such as jet engine turbine blades where most other materials would either melt or oxidize and crumble (1). These alloys must have a high melting temperature, excellent oxidation resistance, good creep resistance, and decent fracture toughness to be successfully used in such environments. The discovery of Ni based superalloys in the 1940s revolutionized the high temperature alloy industry and there has been continued development of these alloys since their advent (2). These materials are capable of operating in oxidative environments in the presence of combustion gases, water vapor and at temperatures around 1050 C. Demands for increased f uel efficiency, however, has highlighted the need for materials that can be used under similar atmospheres and at temperatures in excess of 1200 C. The current Ni based superalloys are restricted to lower temperatures due to the presence of a number of low melting phases that result in softening of the alloys above 1000 C. Therefore, recent research has been aimed at exploring and developing newer alloy systems that can meet the escalating requirements. …
Date:
August 15, 2011
Creator:
Brammer, Travis
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Who Can Serve as Acting Attorney General
This report discusses the two primary arguments raised to challenge the President's decision to name Matthew Whitaker as Acting Attorney General: first, that the Vacancies Act does not apply because another statute, 28 U.S.C. § 508, provides that the Deputy Attorney General (DAG) serves as Acting AG in the event of a vacancy; and second, that the Appointments Clause prohibits Whitaker, a non-Senate-confirmed official, from serving as the head of the Department of Justice (DOJ).
Date:
November 15, 2018
Creator:
Brannon, Valerie C. & Cole, Jared P.
Object Type:
Report
System:
The UNT Digital Library
CRYSTALLINE CERAMIC WASTE FORMS: REFERENCE FORMULATION REPORT
The research conducted in this work package is aimed at taking advantage of the long term thermodynamic stability of crystalline ceramics to create more durable waste forms (as compared to high level waste glass) in order to reduce the reliance on engineered and natural barrier systems. Durable ceramic waste forms that incorporate a wide range of radionuclides have the potential to broaden the available disposal options and to lower the storage and disposal costs associated with advanced fuel cycles. Assemblages of several titanate phases have been successfully demonstrated to incorporate radioactive waste elements, and the multiphase nature of these materials allows them to accommodate variation in the waste composition. Recent work has shown that they can be successfully produced from a melting and crystallization process. The objective of this report is to explain the design of ceramic host systems culminating in a reference ceramic formulation for use in subsequent studies on process optimization and melt property data assessment in support of FY13 melter demonstration testing. The waste stream used as the basis for the development and testing is a combination of the projected Cs/Sr separated stream, the Trivalent Actinide - Lanthanide Separation by Phosphorous reagent Extraction from Aqueous Komplexes (TALSPEAK) …
Date:
May 15, 2012
Creator:
Brinkman, K.; Fox, K. & Marra, J.
Object Type:
Report
System:
The UNT Digital Library
Johnson Noise Thermometry for Advanced Small Modular Reactors
Temperature is a key process variable at any nuclear power plant (NPP). The harsh reactor environment causes all sensor properties to drift over time. At the higher temperatures of advanced NPPs the drift occurs more rapidly. The allowable reactor operating temperature must be reduced by the amount of the potential measurement error to assure adequate margin to material damage. Johnson noise is a fundamental expression of temperature and as such is immune to drift in a sensor’s physical condition. In and near the core, only Johnson noise thermometry (JNT) and radiation pyrometry offer the possibility for long-term, high-accuracy temperature measurement due to their fundamental natures. Small Modular Reactors (SMRs) place a higher value on long-term stability in their temperature measurements in that they produce less power per reactor core and thus cannot afford as much instrument recalibration labor as their larger brethren. The purpose of the current ORNL-led project, conducted under the Instrumentation, Controls, and Human-Machine Interface (ICHMI) research pathway of the U.S. Department of Energy (DOE) Advanced SMR Research and Development (R&D) program, is to develop and demonstrate a drift free Johnson noise-based thermometer suitable for deployment near core in advanced SMR plants.
Date:
September 15, 2012
Creator:
Britton, Charles L., Jr.; Roberts, Michael; Bull, Nora D.; Holcomb, David E. & Wood, Richard T.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of sustained release polylactate electron donors for removal of hexavalent chromium from contaminated groundwater
To evaluate the efficacy of bioimmobilization of Cr(VI) in groundwater at the Department of Energy Hanford site, we conducted a series of microcosm experiments using a range of commercial electron donors with varying degrees of lactate polymerization (polylactate). These experiments were conducted using Hanford Formation sediments (coarse sand and gravel) immersed in Hanford groundwater, which were amended with Cr(VI) and several types of lactate-based electron donors (Hydrogen Release Compound, HRC; primer-HRC, pHRC; extended release HRC) and the polylactate-cysteine form (Metal Remediation Compound, MRC). The results showed that polylactate compounds stimulated an increase in bacterial biomass and activity to a greater extent than sodium lactate when applied at equivalent carbon concentrations. At the same time, concentrations of headspace hydrogen and methane increased and correlated with changes in the microbial community structure. Enrichment of Pseudomonas spp. occurred with all lactate additions, and enrichment of sulfate-reducing Desulfosporosinus spp. occurred with almost complete sulfate reduction. The results of these experiments demonstrate that amendment with the pHRC and MRC forms result in effective removal of Cr(VI) from solution most likely by both direct (enzymatic) and indirect (microbially generated reductant) mechanisms.
Date:
February 15, 2011
Creator:
Brodie, E. L.; Joyner, D. C.; Faybishenko, B.; Conrad, M. E.; Rios-Velazquez, C.; Mork, B. et al.
Object Type:
Article
System:
The UNT Digital Library
AdS/QCD and Light Front Holography: A New Approximation to QCD
The combination of Anti-de Sitter space (AdS) methods with light-front holography leads to a semi-classical first approximation to the spectrum and wavefunctions of meson and baryon light-quark bound states. Starting from the bound-state Hamiltonian equation of motion in QCD, we derive relativistic light-front wave equations in terms of an invariant impact variable {zeta} which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. These equations of motion in physical space-time are equivalent to the equations of motion which describe the propagation of spin-J modes in anti-de Sitter (AdS) space. Its eigenvalues give the hadronic spectrum, and its eigenmodes represent the probability distribution of the hadronic constituents at a given scale. Applications to the light meson and baryon spectra are presented. The predicted meson spectrum has a string-theory Regge form M{sup 2} = 4{kappa}{sup 2}(n+L+S/2); i.e., the square of the eigenmass is linear in both L and n, where n counts the number of nodes of the wavefunction in the radial variable {zeta}. The space-like pion form factor is also well reproduced. One thus obtains a remarkable connection between the description of hadronic modes in AdS space and the Hamiltonian formulation of QCD in …
Date:
February 15, 2010
Creator:
Brodsky, Stanley J. & de Teramond, Guy
Object Type:
Article
System:
The UNT Digital Library
Light-Front Holography and the Light-Front Schrodinger Equation
One of the most important nonperturbative methods for solving QCD is quantization at fixed light-front time {tau} = t+z=c - Dirac's 'Front Form'. The eigenvalues of the light-front QCD Hamiltonian predict the hadron spectrum and the eigensolutions provide the light-front wavefunctions which describe hadron structure. More generally, we show that the valence Fock-state wavefunctions of the light-front QCD Hamiltonian satisfy a single-variable relativistic equation of motion, analogous to the nonrelativistic radial Schrodinger equation, with an effective confining potential U which systematically incorporates the effects of higher quark and gluon Fock states. We outline a method for computing the required potential from first principles in QCD. The holographic mapping of gravity in AdS space to QCD, quantized at fixed light-front time, yields the same light front Schrodinger equation; in fact, the soft-wall AdS/QCD approach provides a model for the light-front potential which is color-confining and reproduces well the light-hadron spectrum. One also derives via light-front holography a precise relation between the bound-state amplitudes in the fifth dimension of AdS space and the boost-invariant light-front wavefunctions describing the internal structure of hadrons in physical space-time. The elastic and transition form factors of the pion and the nucleons are found to be well …
Date:
August 15, 2012
Creator:
Brodsky, Stanley J. & de Teramond, Guy
Object Type:
Article
System:
The UNT Digital Library
Phases of Augmented Hadronic Light-Front Wave Functions
It is an important question whether the final/initial state gluonic interactions which lead to naive-time-reversal-odd single-spin asymmetries and diffraction at leading twist can be associated in a definite way with the light-front wave function hadronic eigensolutions of QCD. We use light-front time-ordered perturbation theory to obtain augmented light-front wave functions which contain an imaginary phase which depends on the choice of advanced or retarded boundary condition for the gauge potential in light-cone gauge. We apply this formalism to the wave functions of the valence Fock states of nucleons and pions, and show how this illuminates the factorization properties of naive-time-reversal-odd transverse momentum dependent observables which arise from rescattering. In particular, one calculates the identical leading-twist Sivers function from the overlap of augmented light-front wavefunctions that one obtains from explicit calculations of the single-spin asymmetry in semi-inclusive deep inelastic lepton-polarized nucleon scattering where the required phases come from the final-state rescattering of the struck quark with the nucleon spectators.
Date:
February 15, 2010
Creator:
Brodsky, Stanley J.; Pasquini, Barbara; Xiao, Bo-Wen & Yuan, Feng
Object Type:
Article
System:
The UNT Digital Library
Angle-resolved photoemission study of the evolution of band structure and charge density wave properties in RTe3 (R= Y, La, Ce, Sm, Gd, Tb and Dy)
We present a detailed ARPES investigation of the RTe{sub 3} family, which sets this system as an ideal 'textbook' example for the formation of a nesting driven Charge Density Wave (CDW). This family indeed exhibits the full range of phenomena that can be associated to CDW instabilities, from the opening of large gaps on the best nested parts of Fermi Surface (FS) (up to 0.4eV), to the existence of residual metallic pockets. ARPES is the best suited technique to characterize these features, thanks to its unique ability to resolve the electronic structure in k-space. An additional advantage of RTe{sub 3} is that the band structure can be very accurately described by a simple 2D tight-binding (TB) model, which allows one to understand and easily reproduce many characteristics of the CDW. In this paper, we first establish the main features of the electronic structure, by comparing our ARPES measurements with Linear Muffin-Tin Orbital band calculations. We use this to define the validity and limits of the TB model. We then present a complete description of the CDW properties and, for the first time, of their strong evolution as a function of R. Using simple models, we are able to reproduce perfectly …
Date:
February 15, 2010
Creator:
Brouet, V.; Yang, W. L.; Zhou, X. J.; Hussain, Z.; Moore, R. G.; He, R. et al.
Object Type:
Article
System:
The UNT Digital Library
ADVANCE System Requirements
N/A
Date:
July 15, 2013
Creator:
Brown, D. A.; Arcilla, R. & Herman, M.
Object Type:
Report
System:
The UNT Digital Library
Photonuclear Physics and Data Evaluations
None
Date:
September 15, 2010
Creator:
Brown, David; Gronberg, Jeff; Verbeke, Jerome & Wright, Doug
Object Type:
Report
System:
The UNT Digital Library
United Nations System Funding: Congressional Issues
This report tracks the process by which Congress provides the funding for U.S. assessed contributions to the regular budgets of the United Nations, its agencies, and U.N. peacekeeping operation accounts, as well as for U.S. voluntary contributions to U.N. system programs and funds. It includes information on the President's request and the congressional response, as well as congressional initiatives during this legislative process. Basic information is provided to help the reader understand this process.
Date:
January 15, 2013
Creator:
Browne, Marjorie Ann
Object Type:
Report
System:
The UNT Digital Library
United Nations Regular Budget Contributions: Members Compared, 1990-2010
This report provides the assessment level, actual payment, and total outstanding contributions for the United States and other selected U.N. member states from 1990 to 2010 — the last year for which data are publicly available.
Date:
January 15, 2013
Creator:
Browne, Marjorie Ann & Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
Recent Developments in Dynamic Transmission Electron Microscopy
None
Date:
April 15, 2011
Creator:
Browning, N D; Bonds, M A; Campbell, G H; Evans, J E; LaGrange, T; Jungjohann, K L et al.
Object Type:
Article
System:
The UNT Digital Library
Congressional Salaries and Allowances
This report provides basic information on congressional salaries and allowances and recent developments. First, the report briefly summarizes the current salary of Members of Congress; limits or prohibitions on their outside earned income, honoraria, and tax deductions; options for life and health insurance; and retirement benefits. Second, the report provides information on allowances available to Representatives and Senators to support them in their official and representational duties.
Date:
January 15, 2013
Creator:
Brudnick, Ida A.
Object Type:
Report
System:
The UNT Digital Library
Guide to Committee Activity Reports: Purpose, Rules, and Contents
This report provides a discussion of the types of information that may be included in the activity reports, variations across reports and time, and the filing process. A table provides a comparison of the committee activity reports and other congressional publications, including the types of information found in each as well as their timeframe for coverage and publication.
Date:
February 15, 2018
Creator:
Brudnick, Ida A.
Object Type:
Report
System:
The UNT Digital Library
Legislative Branch: FY2012 Appropriations
This report gives an overview of the status of FY2012 appropriations and funding issues for the Senate, House of Representatives, and support agencies.
Date:
June 15, 2011
Creator:
Brudnick, Ida A.
Object Type:
Report
System:
The UNT Digital Library
Salaries of Members of Congress: Congressional Votes, 1990-2015
This report contains information on actions taken affecting each pay year since the establishment of the Ethics Reform Act adjustment procedure. It also provides information on other floor action related to pay for Members of Congress.
Date:
April 15, 2015
Creator:
Brudnik, Ida A.
Object Type:
Report
System:
The UNT Digital Library
DOE Computer Graphics Forum 2013 Site Survey
None
Date:
April 15, 2013
Creator:
Brugger, E S; Springmeyer, R R & Laney, D E
Object Type:
Report
System:
The UNT Digital Library
Using the Schur Complement to Reduce Runtime in KULL's Magnetic Diffusion Package
Recently a Resistive Magnetohydrodynamics (MHD) package has been added to the KULL code. In order to be compatible with the underlying hydrodynamics algorithm, a new sub-zonal magnetics discretization was developed that supports arbitrary polygonal and polyhedral zones. This flexibility comes at the cost of many more unknowns per zone - approximately ten times more for a hexahedral mesh. We can eliminate some (or all, depending on the dimensionality) of the extra unknowns from the global matrix during assembly by using a Schur complement approach. This trades expensive global work for cache-friendly local work, while still allowing solution for the full system. Significant improvements in the solution time are observed for several test problems.
Date:
December 15, 2010
Creator:
Brunner, T A & Kolev, T V
Object Type:
Article
System:
The UNT Digital Library
The DACA and DAPA Deferred Action Initiatives: Frequently Asked Questions
This report provides answers to frequently asked questions about the Deferred Action for Childhood Arrivals (DACA) and Deferred Action for Parents of Americans and Lawful Permanent Residents (DAPA) initiatives.
Date:
February 15, 2017
Creator:
Bruno, Andorra
Object Type:
Report
System:
The UNT Digital Library
Enzo: An Adaptive Mesh Refinement Code for Astrophysics
None
Date:
January 15, 2014
Creator:
Bryan, Greg L.; Norman, Michael L.; O'Shea, Brian W.; Abel, Tom; Wise, John H.; Turk, Matthew J. et al.
Object Type:
Article
System:
The UNT Digital Library