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2,782 Matching Results
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Applying SE Methods Achieves Project Success to Evaluate Hammer and Fixed Cutter Grinders Using Multiple Varieties and Moistures of Biomass Feedstock for Ethanol Production
Applying basic systems engineering (SE) tools to the mission analysis phases of a 2.5-million dollar biomass pre-processing project for the U.S. Department of Energy directly assisted the project principal investigator understand the complexity and identify the gaps of a moving-target project and capture the undefined technical/functional requirements and deliverables from the project team and industrial partners. A creative application of various SE tools by non-aerospace systems engineers developed an innovative “big picture” product that combined aspects of mission analysis with a project functional flow block diagram, providing immediate understanding of the depth and breath of the biomass preprocessing effort for all team members, customers, and industrial partners. The “big picture” diagram became the blue print to write the project test plan, and provided direction to bring the project back on track and achieve project success.
Date:
June 1, 2008
Creator:
Zirker, Larry R.; Christopher T. Wright, PhD & Hamelin, R. Douglas
Object Type:
Article
System:
The UNT Digital Library
Approaches to Modeling Coupled Flow and Reaction in a 2-D Cementation Experiment
Porosity evolution at reactive interfaces is a key process that governs the evolution and performances of many engineered systems that have important applications in earth and environmental sciences. This is the case, for example, at the interface between cement structures and clays in deep geological nuclear waste disposals. Although in a different transport regime, similar questions arise for permeable reactive barriers used for biogeochemical remediation in surface environments. The COMEDIE project aims at investigating the coupling between transport, hydrodynamics and chemistry when significant variations of porosity occur. The present work focuses on a numerical benchmark used as a design exercise for the future COMEDIE-2D experiment. The use of reactive transport simulation tools like Hytec and Crunch provides predictions of the physico-chemical evolutions that are expected during the future experiments in laboratory. Focus is given in this paper on the evolution during the simulated experiment of precipitate, permeability and porosity fields. A first case is considered in which the porosity is constant. Results obtained with Crunch and Hytec are in relatively good agreement. Differences are attributable to the models of reactive surface area taken into account for dissolution/precipitation processes. Crunch and Hytec simulations taking into account porosity variations are then presented …
Date:
April 1, 2008
Creator:
Steefel, Carl; Cochepin, B.; Trotignon, L.; Bildstein, O.; Steefel, C.; Lagneau, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Approaching 10% Conversion Efficiency Using Tandem Organic Photovoltaic Cells with Enhanced Optical Coupling: Final Report, October 2004 - December 2007
To find routes to achieving nearly 10% power conversion efficiency based on a new generation of organic photovoltaic cells using vapor-deposited, small-molecular-weight organic materials.
Date:
August 1, 2008
Creator:
Forrest, S.
Object Type:
Report
System:
The UNT Digital Library
Approval of Waste Treatment and Immobilization Plant Contractor- Initiated Authorization Basis Amendment Requests (ABAR)
This report talks about Approval of Waste Treatment and Immobilization Plant Contractor- Initiated Authorization Basis Amendment Requests (ABAR)
Date:
April 1, 2008
Creator:
Gl, Jones
Object Type:
Article
System:
The UNT Digital Library
Approximate analytical solutions for continuously focused beamsand single-species plasmas in thermal equilibrium
None
Date:
December 1, 2008
Creator:
Startsev, Edward A. & Lund, Steven M.
Object Type:
Article
System:
The UNT Digital Library
Approximating conductive ellipsoid inductive responses using static quadrupole moments
Smith and Morrison (2006) developed an approximation for the inductive response of conducting magnetic (permeable) spheroids (e.g., steel spheroids) based on the inductive response of conducting magnetic spheres of related dimensions. Spheroids are axially symmetric objects with elliptical cross-sections along the axis of symmetry and circular cross sections perpendicular to the axis of symmetry. Spheroids are useful as an approximation to the shapes of unexploded ordnance (UXO) for approximating their responses. Ellipsoids are more general objects with three orthogonal principal axes, with elliptical cross sections along planes normal to the axes. Ellipsoids reduce to spheroids in the limiting case of ellipsoids with cross-sections that are in fact circles along planes normal to one axis. Parametrizing the inductive response of unknown objects in terms of the response of an ellipsoid is useful as it allows fitting responses of objects with no axis of symmetry, in addition to fitting the responses of axially symmetric objects. It is thus more appropriate for fitting the responses of metal scrap to be distinguished electromagnetically from unexploded ordnance. Here the method of Smith and Morrison (2006) is generalized to the case of conductive magnetic ellipsoids, and a simplified form used to parametrize the inductive response of …
Date:
October 1, 2008
Creator:
Smith, J. Torquil
Object Type:
Report
System:
The UNT Digital Library
Approximations to wire grid inductance.
None
Date:
January 1, 2008
Creator:
Warne, Larry Kevin; Johnson, William Arthur & Merewether, Kimball O.
Object Type:
Report
System:
The UNT Digital Library
Aquatic Species Program (ASP): Lessons Learned
Presentation on lessons learned from the U.S. Department of Energy?s Aquatic Species Program 1978-1996 microalgae R&D activities, presented at the 2008 AFOSR Workshop in Washington, D.C.
Date:
February 1, 2008
Creator:
Jarvis, E. E.
Object Type:
Article
System:
The UNT Digital Library
Archer County Advocate (Holliday, Tex.), Vol. 6, No. 4, Ed. 1 Thursday, May 1, 2008
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 2008
Creator:
Stevens, Charlotte
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 18, Ed. 1 Thursday, May 1, 2008
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
May 1, 2008
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
The Arctic as a test case for an assessment of climate impacts on national security.
The Arctic region is rapidly changing in a way that will affect the rest of the world. Parts of Alaska, western Canada, and Siberia are currently warming at twice the global rate. This warming trend is accelerating permafrost deterioration, coastal erosion, snow and ice loss, and other changes that are a direct consequence of climate change. Climatologists have long understood that changes in the Arctic would be faster and more intense than elsewhere on the planet, but the degree and speed of the changes were underestimated compared to recent observations. Policy makers have not yet had time to examine the latest evidence or appreciate the nature of the consequences. Thus, the abruptness and severity of an unfolding Arctic climate crisis has not been incorporated into long-range planning. The purpose of this report is to briefly review the physical basis for global climate change and Arctic amplification, summarize the ongoing observations, discuss the potential consequences, explain the need for an objective risk assessment, develop scenarios for future change, review existing modeling capabilities and the need for better regional models, and finally to make recommendations for Sandia's future role in preparing our leaders to deal with impacts of Arctic climate change on …
Date:
November 1, 2008
Creator:
Taylor, Mark A.; Zak, Bernard Daniel; Backus, George A.; Ivey, Mark D. & Boslough, Mark Bruce Elrick
Object Type:
Report
System:
The UNT Digital Library
Are Ventilation Filters Degrading Indoor Air Quality in California Classrooms?
Heating, ventilating, and cooling classrooms in California consume substantial electrical energy. Indoor air quality (IAQ) in classrooms affects studenthealth and performance. In addition to airborne pollutants that are emitted directly by indoor sources and those generated outdoors, secondary pollutants can be formed indoors by chemical reaction of ozone with other chemicals and materials. Filters are used in nearly all classroom heating, ventilation and air?conditioning (HVAC) systems to maintain energy-efficient HVAC performance and improve indoor air quality; however, recent evidence indicates that ozone reactions with filters may, in fact, be a source of secondary pollutants. This project quantitatively evaluated ozone deposition in HVAC filters and byproduct formation, and provided a preliminary assessment of the extent towhich filter systems are degrading indoor air quality. The preliminary information obtained will contribute to the design of subsequent research efforts and the identification of energy efficient solutions that improve indoor air quality in classrooms and the health and performance of students.
Date:
October 1, 2008
Creator:
Fisk, William J.; Destaillats, H.; Apte, M.G.; Destaillats,, Hugo & Fisk, Michael G. Apte and William J.
Object Type:
Report
System:
The UNT Digital Library
Army Corps of Engineers Water Resources Activities: Authorization and Appropriations
This report provides an overview of the Corps civil works program. It covers the congressional authorization and appropriation process, the standard project development process, and other Corps activities and authorities.
Date:
May 1, 2008
Creator:
Carter, Nicole T. & Hughes, H. S.
Object Type:
Report
System:
The UNT Digital Library
Army Corps of Engineers Water Resources Projects: Authorization and Appropriations
This report explains how the congressional authorization and appropriations process overlays the Corps' project development process. Special attention is given to initiating a water resources study, the Water Resources Development Act (WRDA) process, civil works appropriations, and emergency response activities.
Date:
May 1, 2008
Creator:
Carter, Nicole T. & Hughes, H. S.
Object Type:
Report
System:
The UNT Digital Library
The Army's Future Combat System (FCS): Background and Issues for Congress
This report describes the Future Combat System (FCS) program, which was to be the Army's major research, development, and acquisition program consisting of 14 manned and unmanned systems linked by an extensive communications and information network. This report describes the proposed restructuring of the FCS program, which includes modernizing outdated equipment and re-evaluating vehicle design strategy. This report will be superseded by a report on the Army's BCT (Brigade Combat Team) Modernization Strategy when sufficient details are available.
Date:
July 1, 2008
Creator:
Feickert, Andrew
Object Type:
Report
System:
The UNT Digital Library
Arsenic and chromium partitioning in a podzolic soil contaminated by chromated copper arsenate
This research combined the use of selective extractions and x-ray spectroscopy to examine the fate of As and Cr in a podzolic soil contaminated by chromated copper arsenate (CCA). Iron was enriched in the upper 30 cm due to a previous one-time treatment of the soil with Fe(II). High oxalate-soluble Al concentrations in the Bs horizon of the soil and micro-XRD data indicated the presence of short-range ordered aluminosilicates (i.e. proto-imogolite allophane, PIA). In the surface layers, Cr, as Cr(III), was partitioned between a mixed Fe(III)/Cr(III) solid phase that formed upon the Fe(II) application (25-50%) and a recalcitrant phase (50-75%) likely consisting of organic material such as residual CCA-treated wood. Deeper in the profile Cr appeared to be largely in the form of extractable (hydr)oxides. Throughout the soil, As was present as As(V). In the surface layers a considerable fraction of As was also associated with a recalcitrant phase, probably CCA-treated woody debris, and the remainder was associated with (hydr)oxide-like solid phases. In the Bs horizon, however, XAS and XRF findings strongly pointed to the presence of PIA acting as an effective adsorbent for As. This research shows for the first time the relevance of PIA for the adsorption of …
Date:
June 1, 2008
Creator:
Nico, Peter; Hopp, Luisa; Nico, Peter S.; Marcus, Matthew A. & Peiffer, Stefan
Object Type:
Article
System:
The UNT Digital Library
Arsenic in Drinking Water: Regulatory Developments and Issues
This report discusses the Safe Drinking Water Act Amendments of 1996. These amendments directed the Environmental Protection Agency (EPA) to update the standard for arsenic in drinking water.
Date:
June 1, 2008
Creator:
Tiemann, Mary
Object Type:
Report
System:
The UNT Digital Library
[Asleep at the Wheel performs at 2008 Emerald Ball, 1]
Photograph of swing band Asleep at the Wheel performing at the 2008 Emerald Ball. Members can be seen on stage, facing to the left of the camera and playing their instruments. Individuals have been identified as: (right to left) Eddie Rivers, Elizabeth McQueen, David Miller (background), Jason Roberts, and Ray Benson.
Date:
March 1, 2008
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Asleep at the Wheel performs at 2008 Emerald Ball, 2]
Photograph of swing band Asleep at the Wheel performing at the 2008 Emerald Ball. Members can be seen on stage, facing to the right of the camera and playing their instruments. Individuals have been identified as: (l-r) David Sanger (background), Ray Benson, Elizabeth McQueen, and Jason Roberts. Event attendees can be seen gathered in the background of the photograph.
Date:
March 1, 2008
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Aspen Ecology in Rocky Mountain National Park: Age Distribution, Genetics, and the Effects of Elk Herbivory
Lack of aspen (Populus tremuloides) recruitment and canopy replacement of aspen stands that grow on the edges of grasslands on the low-elevation elk (Cervus elaphus) winter range of Rocky Mountain National Park (RMNP) in Colorado has been a cause of concern for more than 70 years (Packard, 1942; Olmsted, 1979; Stevens, 1980; Hess, 1993; R.J. Monello, T.L. Johnson, and R.G. Wright, Rocky Mountain National Park, 2006, written commun.). These aspen stands are a significant resource since they are located close to the park's road system and thus are highly visible to park visitors. Aspen communities are integral to the ecological structure of montane and subalpine landscapes because they contain high native species richness of plants, birds, and butterflies (Chong and others, 2001; Simonson and others, 2001; Chong and Stohlgren, 2007). These low-elevation, winter range stands also represent a unique component of the park's plant community diversity since most (more than 95 percent) of the park's aspen stands grow in coniferous forest, often on sheltered slopes and at higher elevations, while these winter range stands are situated on the low-elevation ecotone between the winter range grasslands and some of the park's drier coniferous forests.
Date:
October 1, 2008
Creator:
Tuskan, Gerald A & Yin, Tongming
Object Type:
Report
System:
The UNT Digital Library
Assembly and Test of a Support Structure for 3.6 m Long Nb3Sn Racetrack Coils
The LHC Accelerator Research Program (LARP) is currently developing 4 m long Nb{sub 3}Sn quadrupole magnets for a possible upgrade of the LHC Interaction Regions (IR). In order to provide a reliable test bed for the fabrication and test of long Nb{sub 3}Sn coils, LARP has started the development of the long racetrack magnet LRS01. The magnet is composed of two 3.6 m long racetrack coils contained in a support structure based on an aluminum shell pre-tensioned with water-pressurized bladders and interference keys. For the phase-one test of the assembly procedure and loading operation, the structure was pre-stressed at room temperature and cooled down to 77 K with instrumented, solid aluminum 'dummy coils'. Mechanical behavior and stress homogeneity were monitored with strain gauges mounted on the shell and the dummy coils. The dummy coils were replaced with reacted and impregnated Nb{sub 3}Sn coils in a second assembly procedure, followed by cool-down to 4.5 K and powered magnet test. This paper report on the assembly and loading procedures of the support structure as well as the comparison between strain gauge data and 3D model predictions.
Date:
June 1, 2008
Creator:
Ambrosio, G.; Anerella, M.; Caspi, S.; Cheng, D. W.; Felice, H.; Hafalia, A. R. et al.
Object Type:
Article
System:
The UNT Digital Library
Assessing the Value of Regulation Resources Based on Their Time Response Characteristics
Fast responsive regulation resources are potentially more valuable as a power system regulation resource (more efficient) because they allow applying controls at the exact moment and in the exact amount as needed. Faster control is desirable because it facilitates more reliable compliance with the NERC Control Performance Standards at relatively lesser regulation capacity procurements. The current California ISO practices and markets do not provide a differentiation among the regulation resources based on their speed of response (with the exception of some minimum ramping capabilities). Some demand response technologies, including some generation and energy storage resources, can provide quicker control actions. California ISO practices and markets could be updated to welcome more fast regulation resources into the California ISO service area. The project work reported in this work was pursuing the following objectives: • Develop methodology to assess the relative value of generation resources used for regulation and load following California ISO functions • This assessment should be done based on physical characteristics including the ability to quickly change their output following California ISO signals • Evaluate what power is worth on different time scales • Analyze the benefits of new regulation resources to provide effective compliance with the mandatory NERC …
Date:
June 1, 2008
Creator:
Makarov, Yuri V.; Lu, Shuai; Ma, Jian & Nguyen, Tony B.
Object Type:
Report
System:
The UNT Digital Library
Assessment of Failure Mechanisms for GFR Vented Fuel Pins Using Hexoloy Cladding
A near-term vented fuel pin concept as a back-up option for the gas-cooled fast reactor (GFR) system was evaluated. This work explored the feasibility of using mixed carbide fuel (U0.85P0.15)C with off-the-shelf monolithic SiC clad in order to meet requirements for GFR fuel with an average burnup of 10%. The stress loading on the SiC cladding due to fuel swelling and thermal stress due to temperature gradient were estimated based on the data from the development of carbide fuels in the 1970’s-1980’s and the materials properties for SiC tubes. The fuel swelling at the goal burnup (10%) is expected to produce a hoop stress of approximately 32 MPa in cladding, approaching the estimated maximum allowable hoop stress (~33 MPa) for a SiC cladding reliability of 99.99%. The estimated tensile thermal stress component (~121 MPa) near the outer surface of a monolithic SiC cladding is likely to limit its application at high temperatures.
Date:
September 1, 2008
Creator:
Gan, Jian
Object Type:
Article
System:
The UNT Digital Library
Assessment of Startup Fuel Options for the GNEP Advanced Burner Reactor (ABR)
The Global Nuclear Energy Program (GNEP) includes a program element for the development and construction of an advanced sodium cooled fast reactor to demonstrate the burning (transmutation) of significant quantities of minor actinides obtained from a separations process and fabricated into a transuranic bearing fuel assembly. To demonstrate and qualify transuranic (TRU) fuel in a fast reactor, an Advanced Burner Reactor (ABR) prototype is needed. The ABR would necessarily be started up using conventional metal alloy or oxide (U or U, Pu) fuel. Startup fuel is needed for the ABR for the first 2 to 4 core loads of fuel in the ABR. Following start up, a series of advanced TRU bearing fuel assemblies will be irradiated in qualification lead test assemblies in the ABR. There are multiple options for this startup fuel. This report provides a description of the possible startup fuel options as well as possible fabrication alternatives available to the program in the current domestic and international facilities and infrastructure.
Date:
February 1, 2008
Creator:
Carmack, Jon; Pasamehmetoglu, Kemal O. & Alberstein, David
Object Type:
Report
System:
The UNT Digital Library