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631 Matching Results
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Department of Energy: NNSA Restructuring and Progress in Implementing Title 32
Testimony issued by the General Accounting Office with an abstract that begins "Created to correct long-standing and widely recognized management and security problems at the Department of Energy (DOE), the National Nuclear Security Administration (NNSA) manages the nation's nuclear weapons, nonproliferation, and naval reactors programs. Although NNSA announced a new headquarters organization in May 2001, it did not meet the Administrator's promise of implementing a new structure for the entire organization by October 2001. Furthermore, NNSA lost momentum during the summer in its effort to implement a comprehensive planning, programming, and budgeting process. NNSA has used only 19 of the 300 excepted service positions authorized by Title 32 of the National Defense Authorization Act for Fiscal Year 2000. NNSA expects to report to Congress next month on its plans for using its excepted service authority. However, NNSA lacks a long-term strategic approach to ensure a well-managed, properly sized, and skilled workforce over the long run."
Date:
February 26, 2002
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
The Judgment Fund: Status of Reimbursements Required by the No FEAR Act and Contract Disputes Act
Correspondence issued by the Government Accountability Office with an abstract that begins "The Notification and Federal Employee Antidiscrimination and Retaliation (No FEAR) Act of 2002 has, since October 1, 2003, required federal agencies to reimburse the Judgment Fund for payments made to claimants to cover judgments, awards, and settlements in equal employment opportunity (EEO) and whistleblower cases. As we previously reported in 2004, the reimbursement provision of the No FEAR Act was intended to make agencies more accountable for their violations of employment discrimination and whistleblower protection laws brought against the agencies. Similarly, the Contract Disputes Act of 1978 (CDA) also has, since March 1, 1979, required agencies to reimburse the Judgment Fund for payments to claimants in cases involving federal contract disputes. The No FEAR Act mandated that we conduct a study of the payments, reimbursements, and effects of the reimbursement provisions of both No FEAR Act and CDA cases. In 1956, Congress established the Judgment Fund, which is a permanent, indefinite appropriation to pay judgments against federal agencies that are not otherwise provided for by other appropriations. In 1961, legislation was enacted allowing the Judgment Fund to pay, among other things, Department of Justice (DOJ) settlements of ongoing …
Date:
February 26, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Nanostructured Assemblies of Thermoelectric Composite Materials
At the end of the funding period (March 2003) for our program in ferroelectric oxide nanomaterials, we had 3 publications in print, one more had been submitted and two more were in preparation in peer-reviewed journals and invited symposia lectures had been given since starting the project in the Fall of 1999. We hired two postdoctoral fellows, Dr. Ki-Seog Chang and Dr. Wenzhong Wang. We have also trained two graduate students, Ms. Keri Williams and Ms. Bernadette Hernandez, and one undergraduate student (Mr. Michael Scancella).
Date:
February 26, 2008
Creator:
Dorhout, Peter K. & Fisher, Ellen R.
Object Type:
Report
System:
The UNT Digital Library
Evaluating EUV mask pattern imaging with two EUV microscopes
Aerial image measurement plays a key role in the development of patterned reticles for each generation of lithography. Studying the field transmitted (reflected) from EUV masks provides detailed information about potential disruptions caused by mask defects, and the performance of defect repair strategies, without the complications of photoresist imaging. Furthermore, by measuring the continuously varying intensity distribution instead of a thresholded, binary resist image, aerial image measurement can be used as feedback to improve mask and lithography system modeling methods. Interest in EUV, at-wavelength, aerial image measurement lead to the creation of several research tools worldwide. These tools are used in advanced mask development work, and in the evaluation of the need for commercial at-wavelength inspection tools. They describe performance measurements of two such tools, inspecting the same EUV mask in a series of benchmarking tests that includes brightfield and darkfield patterns. One tool is the SEMATECH Berkeley Actinic Inspection Tool (AIT) operating on a bending magnet beamline at Lawrence Berkeley National Laboratory's Advanced Light Source. The AIT features an EUV Fresnel zoneplate microscope that emulates the numerical aperture of a 0.25-NA stepper, and projects the aerial image directly onto a CCD camera, with 700x magnification. The second tool is …
Date:
February 26, 2008
Creator:
Goldberg, Kenneth A.; Takase, Kei; Naulleau, Patrick P.; Han, Hakseung; Barty, Anton; Kinoshita, Hiroo et al.
Object Type:
Article
System:
The UNT Digital Library
An Octadentate Luminescent Eu(III) 1,2-HOPO Chelate with PotentAqueous Stability
None
Date:
February 26, 2007
Creator:
Moore, Evan G.; Jocher, Christoph J.; Xu, Jide; Werner, Eric J. & Raymond,Kenneth N.
Object Type:
Article
System:
The UNT Digital Library
Thermal-Structural Analysis of the MacArthur Maze Freeway Collapse
At approximately 3:41 AM on the morning of April 29, 2007, a tractor-trailer rig carrying 8,600 gallons (32.6 m{sup 3}) of fuel overturned on Interstate 880 in Oakland, CA. The resultant fire weakened the surrounding steel superstructure and caused a 50-yard (45.7 m) long section of the above connecting ramp from Interstate 80 to Interstate 580 to fail in approximately 18 minutes. In this study, we performed a loosely-coupled thermal-structural finite element analysis of the freeway using the LLNL Engineering codes NIKE3D, DYNA3D and TOPAZ3D. First, we applied an implicit structural code to statically initialize the stresses and displacements in the roadway at ambient conditions due to gravity loading. Next, we performed a thermal analysis by approximating the tanker fire as a moving box region of uniform temperature. This approach allowed for feasible calculation of the fire-to-structure radiative view factors and convective heat transport. We used a mass scaling methodology in the thermal analysis to reduce the overall simulation time so an explicit structural analysis could be used, which provided a more computationally efficient simulation of structural failure. Our approach showed structural failure of both spans due to thermal softening under gravity loading at approximately 20 minutes for a fixed …
Date:
February 26, 2008
Creator:
Noble, C. R.; Wemhoff, A. P. & McMichael, L. D.
Object Type:
Article
System:
The UNT Digital Library
Noise in a Calorimeter Readout System Using Periodic Sampling
Fourier transform analysis of the calorimeter noise problem gives quantitative results on (a) the time-height correlation, (b) the effect of background on optimal shaping and on the ENC, (c) sampling frequency requirements, and (d) the relation between sampling frequency and the required quantization error.
Date:
February 26, 2009
Creator:
Innes, Walter R.
Object Type:
Report
System:
The UNT Digital Library
Exciton dynamicsstudied via internal THz transitions
We employ a novel, ultrafast terahertz probe to investigatethe dynamical interplay of optically-induced excitons and unboundelectron-hole pairs in GaAs quantum wells. Resonant creation ofheavy-hole excitons induces a new low-energy oscillator linked totransitions between the internal exciton degrees of freedom. The timeresolved terahertz optical conductivity is found to be a probe wellsuited for studies of fundamental processes such as formation, relaxationand ionization of excitons.
Date:
February 26, 2003
Creator:
Kaindl, R. A.; Hagele, D.; Carnahan, M. A.; Lovenich, R. & Chemla, D. S.
Object Type:
Article
System:
The UNT Digital Library
Compound-Nuclear Reaction Cross Sections from Surrogate Measurements: Status and Challenges
None
Date:
February 26, 2008
Creator:
Escher, J.
Object Type:
Article
System:
The UNT Digital Library
Identifying Oil Exploration Leads using Intergrated Remote Sensing and Seismic Data Analysis, Lake Sakakawea, Fort Berthold Indian Reservation, Willistion Basin
The Fort Berthold Indian Reservation, inhabited by the Arikara, Mandan and Hidatsa Tribes (now united to form the Three Affiliated Tribes) covers a total area of 1530 mi{sup 2} (980,000 acres). The Reservation is located approximately 15 miles east of the depocenter of the Williston basin, and to the southeast of a major structural feature and petroleum producing province, the Nesson anticline. Several published studies document the widespread existence of mature source rocks, favorable reservoir/caprock combinations, and production throughout the Reservation and surrounding areas indicating high potential for undiscovered oil and gas resources. This technical assessment was performed to better define the oil exploration opportunity, and stimulate exploration and development activities for the benefit of the Tribes. The need for this assessment is underscored by the fact that, despite its considerable potential, there is currently no meaningful production on the Reservation, and only 2% of it is currently leased. Of particular interest (and the focus of this study) is the area under the Lake Sakakawea (formed as result of the Garrison Dam). This 'reservoir taking' area, which has never been drilled, encompasses an area of 150,000 acres, and represents the largest contiguous acreage block under control of the Tribes. Furthermore, …
Date:
February 26, 2004
Creator:
Reeves, Scott R. & Billingsley, Randal L.
Object Type:
Report
System:
The UNT Digital Library
Spectroscopy of neutron-rich palladium and cadmium isotopes near A=120
New high-spin levels have been identified in the nucleus {sup 120}Pd from analysis of the coincidence gamma rays observed in the {sup 238}U({alpha}, f{gamma}{gamma}{gamma}) reaction. Recoiling fragments were detected with the Rochester heavy-ion detector array, CHICO, in coincidence with gamma-rays using Gammasphere. An A=110-130 mass-gated {gamma} - {gamma} - {gamma} cube from this experiment was constructed and analyzed for coincident gamma-rays in several nuclei near A=120. New results for neutron-rich {sup 118}Pd and {sup 120}Pd have been obtained. The {sup 120}Pd level scheme was extended to spin of 10{sup +} by building on the new low-energy gamma rays identified in decay studies of {sup 120}Rh. The details of the {sup 118}Pd level scheme derived from this work are compared to previous work. The systematics of the yrast levels in even-even Pd and Cd isotopes are presented and the symmetry of energy levels around N = 68 is discussed. A new 10{sup +} level in {sup 124}Cd has been observed. The population intensity of even-even neutron-rich Cd isotopes is deduced, indicating that nuclides near {sup 120}Cd are preferentially populated following alpha-induced fission of {sup 238}U.
Date:
February 26, 2008
Creator:
Stoyer, M A & Walters, W B
Object Type:
Article
System:
The UNT Digital Library
A review of ground-based heavy-ion radiobiology relevant to space radiation risk assessment: Part II. Cardiovascular and immunological effects
The future of manned space flight depends on an analysis of the numerous potential risks of travel into deep space. Currently no radiation dose limits have been established for these exploratory missions. To set these standards more information is needed about potential acute and late effects on human physiology from appropriate radiation exposure scenarios, including pertinent radiation types and dose rates. Cancer risks have long been considered the most serious late effect from chronic daily relatively low-dose exposures to the complex space radiation environment. However, other late effects from space radiation exposure scenarios are under study in ground-based accelerator facilities and have revealed some unique particle radiation effects not observed with conventional radiations. A comprehensive review of pertinent literature that considers tissue effects of radiation leading to functional detriments in specific organ systems has recently been published (NCRP National Council on Radiation Protection and Measurements, Information Needed to Make Radiation Protection Recommendations for Space Missions Beyond Low-Earth Orbit, Report 153, Bethesda, MD, 2006). This paper highlights the review of two non-cancer concerns from this report: cardiovascular and immunological effects.
Date:
February 26, 2007
Creator:
Blakely, Eleanor A. & Chang, Polly Y.
Object Type:
Article
System:
The UNT Digital Library
Reduction of pertechnetate by acetohydroxamic acid: Formation of [TcNO(AHA)2(H2O)]+ and implications for the UREX process.
Reductive nitrosylation and complexation of ammonium pertechnetate by acetohydroxamic acid has been achieved in aqueous nitric and perchloric acid solutions. The kinetics of the reaction depend on the relative concentrations of the reaction components and are accelerated at higher temperatures. The reaction does not occur unless conditions are acidic. Analysis of the x-ray absorption fine structure spectroscopic data is consistent with a pseudo-octahedral geometry with the linear Tc-N-O bond typical of technetium nitrosyl compounds, and electron spin resonance spectroscopy is consistent with a the d{sup 5} Tc(II) nitrosyl complex. The nitrosyl source is generally AHA, but may be augmented by products of reaction with nitric acid. The resulting low-valency trans-aquonitrosyl(diacetohydroxamic)-technetium(II) complex (1) is highly soluble in water, extremely hydrophilic, and is not extracted by tri-n-butylphosphate in a dodecane diluent. Its extraction properties are not pH-dependent; titration studies indicate a single species from pH 4.5 down to -0.6 (calculated). This molecule is resistant to oxidation by H{sub 2}O{sub 2}, even at high pH, and can undergo substitution to form other technetium nitrosyl complexes. The formation of 1 may strongly impact the fate of technetium in the nuclear fuel cycle.
Date:
February 26, 2008
Creator:
1Harry Reid Center for Environmental Studies, Nuclear Science and Technology Division, University of Nevada, Las Vegas, Las Vegas, NV, 89154-4006; Gong, Cynthia-May S; Poineau, Frederic; Lukens, Wayne W & Czerwinski, Kenneth R.
Object Type:
Article
System:
The UNT Digital Library
Stochastic Hard-Sphere Dynamics for Hydrodynamics of Non-Ideal Fluids
A novel stochastic fluid model is proposed with a nonideal structure factor consistent with compressibility, and adjustable transport coefficients. This stochastic hard-sphere dynamics (SHSD) algorithm is a modification of the direct simulation Monte Carlo algorithm and has several computational advantages over event-driven hard-sphere molecular dynamics. Surprisingly, SHSD results in an equation of state and a pair correlation function identical to that of a deterministic Hamiltonian system of penetrable spheres interacting with linear core pair potentials. The fluctuating hydrodynamic behavior of the SHSD fluid is verified for the Brownian motion of a nanoparticle suspended in a compressible solvent.
Date:
February 26, 2008
Creator:
Donev, A; Alder, B J & Garcia, A L
Object Type:
Article
System:
The UNT Digital Library
Automotive Underhood Thermal Management Analysis Using 3-D Coupled Thermal-Hydrodynamic Computer Models: Thermal Radiation Modeling
The goal of the radiation modeling effort was to develop and implement a radiation algorithm that is fast and accurate for the underhood environment. As part of this CRADA, a net-radiation model was chosen to simulate radiative heat transfer in an underhood of a car. The assumptions (diffuse-gray and uniform radiative properties in each element) reduce the problem tremendously and all the view factors for radiation thermal calculations can be calculated once and for all at the beginning of the simulation. The cost for online integration of heat exchanges due to radiation is found to be less than 15% of the baseline CHAD code and thus very manageable. The off-line view factor calculation is constructed to be very modular and has been completely integrated to read CHAD grid files and the output from this code can be read into the latest version of CHAD. Further integration has to be performed to accomplish the same with STAR-CD. The main outcome of this effort is to obtain a highly scalable and portable simulation capability to model view factors for underhood environment (for e.g. a view factor calculation which took 14 hours on a single processor only took 14 minutes on 64 processors). …
Date:
February 26, 2002
Creator:
Pannala, S.; D'Azevedo, E. & Zacharia, T.
Object Type:
Report
System:
The UNT Digital Library
2009 EVALUATION OF TRITIUM REMOVAL AND MITIGATION TECHNOLOGIES FOR WASTEWATER TREATMENT
Since 1995, a state-approved land disposal site (SALDS) has received tritium contaminated effluents from the Hanford Site Effluent Treatment Facility (ETF). Tritium in this effluent is mitigated by storage in slow moving groundwater to allow extended time for decay before the water reaches the site boundary. By this method, tritium in the SALDS is isolated from the general environment and human contact until it has decayed to acceptable levels. This report contains the 2009 update evaluation of alternative tritium mitigation techniques to control tritium in liquid effluents and groundwater at the Hanford site. A thorough literature review was completed and updated information is provided on state-of-the-art technologies for control of tritium in wastewaters. This report was prepared to satisfy the Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement) Milestone M-026-07B (Ecology, EPA, and DOE 2007). Tritium separation and isolation technologies are evaluated periodically to determine their feasibility for implementation to control Hanford site liquid effluents and groundwaters to meet the Us. Code of Federal Regulations (CFR), Title 40 CFR 141.16, drinking water maximum contaminant level (MCL) for tritium of 20,000 pOll and/or DOE Order 5400.5 as low as reasonably achievable (ALARA) policy. Since the 2004 evaluation, there have been …
Date:
February 26, 2009
Creator:
KJ, LUECK; DJ, GENESSE & GE, STEGEN
Object Type:
Report
System:
The UNT Digital Library
Calibration of Chemical Kinetic Models Using Simulations of Small-Scale Cookoff Experiments
Establishing safe handling limits for explosives in elevated temperature environments is a difficult problem that often requires extensive simulation. The largest influence on predicting thermal cookoff safety lies in the chemical kinetic model used in these simulations, and these kinetic model reaction sequences often contain multiple steps. Several small-scale cookoff experiments, notably Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), One-Dimensional Time-to-Explosion (ODTX), and the Scaled Thermal Explosion (STEX) have been performed on various explosives to aid in cookoff behavior determination. Past work has used a single test from this group to create a cookoff model, which does not guarantee agreement with the other experiments. In this study, we update the kinetic parameters of an existing model for the common explosive 2,4,6-Trinitrotoluene (TNT) using DSC and ODTX experimental data at the same time by minimizing a global Figure of Merit based on hydrodynamic simulated data. We then show that the new kinetic model maintains STEX agreement, reduces DSC agreement, and improves ODTX and TGA agreement when compared to the original model. In addition, we describe a means to use implicit hydrodynamic simulations of DSC experiments to develop a reaction model for TNT melting.
Date:
February 26, 2008
Creator:
Wemhoff, A P; Becker, R C & Burnham, A K
Object Type:
Article
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 39, No. 38, Ed. 1 Tuesday, February 26, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 26, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 37, Ed. 1 Tuesday, February 26, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 26, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 44, Ed. 1 Thursday, February 26, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
February 26, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 45, Ed. 1 Thursday, February 26, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
February 26, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 39, No. 9, Ed. 1 Thursday, February 26, 2009
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
February 26, 2009
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Helen's Itinerary
Helen Snapp's itinerary, compiled by David A. Stallman, which includes the contact information for Helen, David, and Brian Moffett, the addresses for a museum and Holiday Inn #68088282. and Delta flight information.
Date:
February 26, 2008
Creator:
Stallman, David A.
Object Type:
Text
System:
The Portal to Texas History
[Texas flags email correspondence]
Email correspondence about an article on museums housing historic flags across Texas that was published in the March 2002 issue of Texas Highways magazine.
Date:
2001-02-26/2002-01-09
Creator:
Mallory, Randy; Heidbreder, Larry; Adams, John; Watkins, Kirsten; Dark, Deena Harrison; Sutton, Meredith et al.
Object Type:
Text
System:
The UNT Digital Library