Ponnequin Wind Energy Project: Reference site avian study, January 1, 1998--December 31, 1998 (open access)

Ponnequin Wind Energy Project: Reference site avian study, January 1, 1998--December 31, 1998

This report summarizes the results of surveys completed during the period January 1, 1998, through December 31, 1998, at the Ponnequin Wind Energy Project in Weld County, Colorado. The surveys were conducted at two reference sites, and include a pre-construction avian abundance and use survey and raptor nesting, prey, and carcass surveys. The reference sites were situated immediately to the west of the project site in Weld County, Colorado, and 4.8 kilometers to the north of the site in Laramie County, Wyoming. The surveys were conducted along two 800-meter (m) main transects at each site with two 400-m (by 100-m) perpendicular transects. About 30 complete surveys were completed during the year, with a greater frequency of surveys in the late spring and early autumn. The surveys revealed mostly common species, with no endangered or threatened species on the sites. Small numbers of raptors were observed on or near the project and reference areas. During the winter, avian use and abundance was minimal. Prey species consisted primarily of thirteen-lined ground squirrels and northern pocket gophers. Two songbird carcasses were found. The results of these surveys, combined with data from several more months of surveys, will be compared to surveys conducted after …
Date: April 5, 2000
Creator: Kerlinger, P.; Curry, R. & Ryder, R.
Object Type: Report
System: The UNT Digital Library
Soil sample preparation using microwave digestion for uranium analysis (open access)

Soil sample preparation using microwave digestion for uranium analysis

A new sample preparation procedure has been developed for digestion of soil samples for uranium analysis. The technique employs a microwave oven digestion system to digest the sample and to prepare it for separation chemistry and analysis. The method significantly reduces the volume of acids used, eliminates a large fraction of acid vapor emissions, and speeds up the analysis time. The samples are analyzed by four separate techniques: Gamma Spectrometry, Alpha Spectroscopy using the open digestion method, Kinetic Phosphorescence Analysis (KPA) using open digestion, and KPA by Microwave digestion technique. The results for various analytical methods are compared and used to confirm the validity of the new procedure. The details of the preparation technique along with its benefits are discussed.
Date: April 5, 2000
Creator: Mohagheghi, Amir H.; Preston, Rose; Akbarzadeh, Mansoor & Bakhtiar, Steven
Object Type: Article
System: The UNT Digital Library
Progress on linking gender and sustainable energy (open access)

Progress on linking gender and sustainable energy

The field of gender and energy has been identified as critical in global sustainable energy development and is increasingly important to decision makers. The theme of women and energy was of significance at the 1998 World Renewable Energy Congress in Florence, Italy. This paper traces further developments in this field by summarizing selected programmatic initiatives, meetings, and publications over the past 18 months.
Date: April 5, 2000
Creator: Farhar, B.
Object Type: Report
System: The UNT Digital Library
Federal Renewable Energy Screening Assistant (FRESA) User's Manual: Version 2.5 (open access)

Federal Renewable Energy Screening Assistant (FRESA) User's Manual: Version 2.5

The FRESA computer program, Version 2.5, provides an easy way to collect and process building and facility data to indicate opportunities for renewable energy applications in federal facilities and buildings. The purpose of this analytic tool is to focus feasibility study efforts on those applications most likely to prove cost-effective. The program is a supplement to energy and water conservation audits, which must be completed for all federal buildings and will flag renewable energy opportunities by facilitating the evaluation and ranking process. FRESA results alone are generally not sufficient to establish project feasibility. The FRESA User's Manual provides instruction on getting started; an overview of the FRESA program structure; an explanation of the screening process; detailed information on using the functions of Facility/Building Info, Building/Facility Analysis, Input/Output, and Weather Data or Adding a Zip Code; troubleshooting; and archiving data. Appendices include Algorithms Used in FRESA Prescreening, Excel Spreadsheets for FRESA Inputs, Other Useful Information, and Acronyms and Abbreviations.
Date: April 5, 2000
Creator: Brown, T.; Tapia, D. & Mas, C.
Object Type: Book
System: The UNT Digital Library
Remedial Action Work Plan Amchitka Island Mud Pit Closures (open access)

Remedial Action Work Plan Amchitka Island Mud Pit Closures

This remedial action work plan presents the project organization and construction procedures developed for the performance of the remedial actions at U.S. Department of Energy (DOE's) sites on Amchitka Island, Alaska. During the late1960s and early 1970s, the U.S. Department of Defense and the U.S. Atomic Energy Commission (the predecessor agency to DOE) used Amchitka Island as a site for underground nuclear tests. A total of nine sites on the Island were considered for nuclear testing; however, tests were only conducted at three sites (i.e., Long Shot in 1965, Milrow in 1969, and Cannikin in 1971). In addition to these three sites, large diameter emplacement holes were drilled in two other locations (Sites D and F) and an exploratory hole was in a third location (Site E). It was estimated that approximately 195 acres were disturbed by drilling or preparation for drilling in conjunction with these activities. The disturbed areas include access roads, spoil-disposal areas, mud pits which have impacted the environment, and an underground storage tank at the hot mix plant which was used to support asphalt-paving operations on the island. The remedial action objective for Amchitka Island is to eliminate human and ecological exposure to contaminants by capping …
Date: April 5, 2001
Creator: United States. Department of Energy. Nevada Operations Office.
Object Type: Report
System: The UNT Digital Library
Examining CP symmetry in strange baryon decay (open access)

Examining CP symmetry in strange baryon decay

Non-conservation of CP symmetry can manifest itself in non-lepton ichyperon decays as a difference in the decay parameter between the strange-baryon decay and its charge conjugate. By comparing the decay distribution in the {Lambda} helicity frame for the decay sequence {Xi}{sup -} {yields} {Lambda}{pi}{sup -}, {Lambda} {yields} p{pi}{sup -} with that of {bar {Xi}}{sup +} decay, E756 at Fermilab did not observe any CP-odd effect at the 10{sup -2} level. The status of a follow-up experiment, HyperCP (FNAL E871), to search for CP violation in charged {Xi}-{Lambda} decay with a sensitivity of 10{sup -4} is also presented.
Date: April 5, 2000
Creator: Luk, Kam-Biu; Burnstein, R. A.; Chakravorty, A.; Chan, A.; Chen, Y. C.; Choong, W. S. et al.
Object Type: Article
System: The UNT Digital Library
Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotating Odd-parity Magnetic Fields (open access)

Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotating Odd-parity Magnetic Fields

The trajectories of individual electrons are studied numerically in a 3D, prolate, FRC [field-reversed configuration] equilibrium magnetic geometry with added small-aplitude, slowly rotating, odd-parity magnetic fields (RFos). RMFos cause electron heating by toroidal acceleration near the 0-point line and by field-parallel acceleration away from it, both followed by scattering from magnetic-field inhomogeneities. Electrons accelerated along the 0-point line move antiparallel to the FRC's current and attain average toroidal angular speeds near that of the RMFo, independent of the sense of RMFo rotation. A conserved transformed Hamiltonian, dependent on electron energy and RMFo sense, controls electron flux-surface coordinate.
Date: April 5, 2001
Creator: Glasser, Alan H. & Cohen, Samuel A.
Object Type: Report
System: The UNT Digital Library
Relativistic Pseudopotentional Incorporating Core/Valence Polarization and Nonlocal Effects (open access)

Relativistic Pseudopotentional Incorporating Core/Valence Polarization and Nonlocal Effects

A relativistic pseudopotentional (RPP) for use in ab initio molecular electronic structure calculations is derived in the context of the relativistic effective core potential (REP) method of Lee et al. The resulting atom-specific RPP has salient features of the REP imbedded within it while retaining the form of a functional that is dynamically defined at runtime when used in calculations on molecules. The RPP is determined from Dirac-Fock wave functions for the isolated atom. Outercore two-electron interactions are incorporated into the RPP by means of variable coefficients that are defined in the context of the final molecular wave function. This form permits polarization of the outercore shells analogous to that occurring in all-electron molecular Hartree-Fock calculations while retaining these shells as part of the atomic pseudopotentional. Use of the RPP in post-Hartree-Fock molecular calculations permits the incorporation of core/valence correlation effects.
Date: April 5, 2001
Creator: Marino, M. M.
Object Type: Report
System: The UNT Digital Library
Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotation Odd-parity Magnetic Fields (RMF[subscript o]) (open access)

Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotation Odd-parity Magnetic Fields (RMF[subscript o])

The trajectories of individual electrons are studied numerically in a 3D, prolate, FRC [field-reversed configuration] equilibrium magnetic geometry with added small-amplitude, slowly rotating, odd-parity magnetic fields (RMFos). RMFos cause electron heating by toroidal acceleration near the O-point line and by field-parallel acceleration away from it, both followed by scattering from magnetic-field inhomogeneities. Electrons accelerated along the O-point line move antiparallel to the FRC's current and attain average toroidal angular speeds near that of the RMFo, independent of the sense of RMFo rotation. A conserved transformed Hamiltonian, dependent on electron energy and RMFo sense, controls electron flux-surface coordinate.
Date: April 5, 2001
Creator: Glasser, A.H. & Cohen, S.A.
Object Type: Report
System: The UNT Digital Library
The Options for Weatherization Programs in the NOx Tradable Emission Permit Program (open access)

The Options for Weatherization Programs in the NOx Tradable Emission Permit Program

In September 1998, the U.S. Environmental Protection Agency (EPA) promulgated a rule to address the regional transport of ground-level ozone by reducing nitrogen oxide (NOx) emissions in states that were contributing significantly to air pollution problems for downwind states. One element of this program is a NOx tradable emission rights system, to be implemented by individual states. Large, stationary emission sources such as utilities and large cement plants will be issued certain quantities of emission rights, but EPA has encouraged states to set aside some proportion of these rights for energy-efficiency and renewable energy (EE/RE) programs, which could sell rights and use the proceeds to further support their programs. States have considerable leeway in specifying which EE/RE programs will receive emission rights. The U.S. Department of Energy's (DOE) Weatherization Assistance Program wanted to know whether the funding that could be derived from the sale of NOx emission rights would be large enough to justify the effort of verifying NOx reductions from its weatherization activities. This study projected the scope for NOx emission reductions from electricity-intensive weatherization measures in the twenty-two states, and the District of Columbia, included in the EPA ruling. The twenty-two states covered by the rule could expect …
Date: April 5, 2001
Creator: Jones, D.W.
Object Type: Report
System: The UNT Digital Library
Development of Advanced Ceramic Manufacturing Technology (open access)

Development of Advanced Ceramic Manufacturing Technology

Advanced structural ceramics are enabling materials for new transportation engine systems that have the potential for significantly reducing energy consumption and pollution in automobiles and heavy vehicles. Ceramic component reliability and performance have been demonstrated in previous U.S. DOE initiatives, but high manufacturing cost was recognized as a major barrier to commercialization. Norton Advanced Ceramics (NAC), a division of Saint-Gobain Industrial Ceramics, Inc. (SGIC), was selected to perform a major Advanced Ceramics Manufacturing Technology (ACMT) Program. The overall objectives of NAC's program were to design, develop, and demonstrate advanced manufacturing technology for the production of ceramic exhaust valves for diesel engines. The specific objectives were (1) to reduce the manufacturing cost by an order of magnitude, (2) to develop and demonstrate process capability and reproducibility, and (3) to validate ceramic valve performance, durability, and reliability. The program was divided into four major tasks: Component Design and Specification, Component Manufacturing Technology Development, Inspection and Testing, and Process Demonstration. A high-power diesel engine valve for the DDC Series 149 engine was chosen as the demonstration part for this program. This was determined to be an ideal component type to demonstrate cost-effective process enhancements, the beneficial impact of advanced ceramics on transportation systems, …
Date: April 5, 2001
Creator: Pujari, V. K.
Object Type: Report
System: The UNT Digital Library
Estimating Carbon Supply Curves for Global Forests and Other Land Uses April 2001, Discussion Paper 01-19 (open access)

Estimating Carbon Supply Curves for Global Forests and Other Land Uses April 2001, Discussion Paper 01-19

This study develops cumulative carbon ''supply curves'' for global forests utilizing a dynamic timber supply model for sequestration of forest carbon. Because the period of concern is the next century, and particular time points within that century, the curves are not traditional Marshallian supply curves or steady-state supply curves. Rather, the focus is on cumulative carbon cost curves (quasi-supply curves) at various points in time over the next 100 years. The research estimates a number of long-term, cumulative, carbon quasi-supply curves under different price scenarios and for different time periods. The curves trace out the relationship between an intertemporal price path for carbon, as given by carbon shadow prices, and the cumulative carbon sequestered from the initiation of the shadow prices, set at 2000, to a selected future year (2010, 2050, 2100). The timber supply model demonstrates that cumulative carbon quasi-supply curves that can be generated through forestry significantly depend on initial carbon prices and expectations regarding the time profile of future carbon prices. Furthermore, long-run quasi-supply curves generated from a constant price will have somewhat different characteristics from quasi-supply curves generated with an expectation of rising carbon prices through time.The ?least-cost? curves vary the time periods under consideration and …
Date: April 5, 2001
Creator: Sedjo, Roger; Sohngen, Brent & Mendelsohn, Robert
Object Type: Report
System: The UNT Digital Library
Measuring Generator Performance in Providing Regulation and Load-Following Ancillary Services (open access)

Measuring Generator Performance in Providing Regulation and Load-Following Ancillary Services

In an earlier project, we analyzed data on total system load as well as the loads of eight large industrial customers (Kirby and Hirst 2000). We analyzed these data in terms of system and customer-specific requirements for two real-power ancillary services, regulation and load following. We conducted these analyses using 12 days of data from February 1999 plus 12 days of data from August and September 1999. The project discussed here focused on the supply side (provision) of these two services. Specifically, we examined the output of this control area's generation resources, in aggregate and by unit. We analyzed the performance of these generating units in two ways. First, we analyzed the contribution of these generators to overall system performance [generally relative to the North American Electric Reliability Council (NERC) standards]. Second, we analyzed performance relative to what the control center requested of the generators.
Date: April 5, 2001
Creator: Hirst, E.
Object Type: Report
System: The UNT Digital Library
Final report for Frequency selective surfaces for rugged thermophotovoltaic emitters (open access)

Final report for Frequency selective surfaces for rugged thermophotovoltaic emitters

Ion Optics created an array of regularly spaced holes in a thin conductive surface film on a dielectric substrate. When heated, this pattern behaved as a selective emitter, with more than 50% of total radiation in a well-defined peak with a center frequency determined by geometrical spacing. Peak wavelength did not alter with change in temperature, and materials easily survived 10 hours at 1000 C in air. The selective emitter will increase efficiency of thermophotovoltaic power converters.
Date: April 5, 2001
Creator: Daly, James
Object Type: Report
System: The UNT Digital Library
Final Report for CoDeveloper: A Secure, Web-invocable Collaborative Software Development Tool (open access)

Final Report for CoDeveloper: A Secure, Web-invocable Collaborative Software Development Tool

We implemented a secure prototype for collaborative tool for code development.
Date: April 5, 2002
Creator: Shasharina, Dr. Svetlana
Object Type: Report
System: The UNT Digital Library
Size Scaling of Turbulent Transport in Magnetically Confined Plasmas (open access)

Size Scaling of Turbulent Transport in Magnetically Confined Plasmas

Transport scaling with respect to device size in magnetically confined plasmas is critically examined for electrostatic ion temperature gradient turbulence using global gyrokinetic particle simulations. It is found, by varying device size normalized by ion gyroradius while keeping other dimensionless plasma parameters fixed, that fluctuation scale length is microscopic in the presence of zonal flows. The local transport coefficient exhibits a gradual transition from a Bohm-like scaling for device sizes corresponding to present-day experiments to a gyro-Bohm scaling for future larger devices.
Date: April 5, 2002
Creator: Lin, Z.; Ethier, S.; Hahm, T.S. & Tang, W.M.
Object Type: Report
System: The UNT Digital Library
105-K Basin Material Design Basis Feed Description for Spent Nuclear Fuel (SNF) Project Facilities VOL 2 Sludge (open access)

105-K Basin Material Design Basis Feed Description for Spent Nuclear Fuel (SNF) Project Facilities VOL 2 Sludge

Volume 2 provides estimated chemical and radionuclide inventories of sludge currently stored within the Hanford Site's 105-K Basin This volume also provides estimated chemical and radionuclide inventories for the sludge streams expected to be generated during Spent Nuclear Fuel (SNF) Project activities.
Date: April 5, 2000
Creator: PEARCE, K.L.
Object Type: Report
System: The UNT Digital Library
EXAFS and activity studies of the poisoning effect on Cl on Pt/Al{sub 2}O{sub 3} catalysts during oxidation reactions. (open access)

EXAFS and activity studies of the poisoning effect on Cl on Pt/Al{sub 2}O{sub 3} catalysts during oxidation reactions.

The effect of Cl on the activity of Pt/Al{sub 2}O{sub 3} catalysts for methane oxidation has been studied by H{sub 2} and CO chemisorption, O{sub 2} isotopic exchange, kinetic studies and EXAFS spectroscopy. Catalysts containing 1.5% pt/Al{sub 2}O{sub 3} were prepared by incipient wetness from H{sub 2}PtCl{sub 6} and Pt(NH{sub 3}){sub 4}(NO{sub 3}){sub 2} precursors. Both reduced catalysts have similar dispersion (0.8) as determined by H{sub 2} chemisorption. At low methane concentration (0.3 vol.% CH{sub 4}, 16 vol.% O{sub 2}) the Cl-free catalyst was about 20 times more active during complete methane oxidation than the Cl-containing catalyst. Both CO chemisorption and oxygen exchange were observed on the Cl-free catalyst, whereas they were not detected on the Cl-containing catalyst. On the Cl-free catalyst, only Pt-Pt and Pt-O bonds were detected from the EXAFS results, while on the Cl-containing catalyst additional Pt-Cl bonds were present. The effect of chlorine on activity strongly depended on the reactant concentration. Exposure of the Cl-free catalyst to higher concentrations of methane (3 vol.% CH{sub 4}) reduced the activity to a level similar to that of the Cl-containing catalyst. Addition of HCl to the Cl-free catalyst rendered the activity identical to the catalyst prepared from Cl-containing precursors. …
Date: April 5, 2001
Creator: Gracia, F.; Wolf, E. E.; Miller, J. T. & Kropf, A. J.
Object Type: Article
System: The UNT Digital Library
Final report for Web-Invocable Skimming Environment (WISE): a framework for remote skimming (open access)

Final report for Web-Invocable Skimming Environment (WISE): a framework for remote skimming

We have developed a prototype for remote HEP data selection.
Date: April 5, 2002
Creator: Shasharina, Dr. Svetlana
Object Type: Report
System: The UNT Digital Library
Near-frictionless carbon coatings for spark-ignited direct-injected fuel systems. Final report, January 2002. (open access)

Near-frictionless carbon coatings for spark-ignited direct-injected fuel systems. Final report, January 2002.

This report describes an investigation by the Tribology Section of Argonne National Laboratory (ANL) into the use of near-frictionless carbon (NFC) coatings for spark-ignited, direct-injected (SIDI) engine fuel systems. Direct injection is being pursued in order to improve fuel efficiency and enhance control over, and flexibility of, spark-ignited engines. SIDI technology is being investigated by the Partnership for a New Generation of Vehicles (PNGV) as one route towards meeting both efficiency goals and more stringent emissions standards. Friction and wear of fuel injector and pump parts were identified as issues impeding adoption of SIDI by the OTT workshop on ''Research Needs Related to CIDI and SIDI Fuel Systems'' and the resulting report, Research Needs Related to Fuel Injection Systems in CIDI and SIDI Engines. The following conclusions were reached: (1) Argonne's NFC coatings consistently reduced friction and wear in existing and reformulated gasolines. (2) Compared to three commercial DLC coatings, NFC provided the best friction reduction and protection from wear in gasoline and alternative fuels. (3) NFC was successfully deposited on production fuel injectors. (4) Customized wear tests were performed to simulate the operating environment of fuel injectors. (5) Industry standard lubricity test results were consistent with customized wear tests …
Date: April 5, 2002
Creator: Hershberger, J.; Ozturk, O.; Ajayi, O. O.; Woodford, J. B.; Erdemir, A. & Fenske, G. R.
Object Type: Report
System: The UNT Digital Library
Image and Dose Simulation in Support of New Mammography Modalities (open access)

Image and Dose Simulation in Support of New Mammography Modalities

This report summarizes the highlights of the research performed under the 2-year NEER grant from the Department of Energy. The primary outcome of the work was a new Monte Carlo code, MCMIS-DS, for Monte Carlo for Mammography Image Simulation including Differential Sampling. The code was written to generate simulated images and dose distributions from two different new digital x-ray imaging modalities, namely, synchrotron imaging (SI) and a slot geometry digital mammography system called Fisher Senoscan. A differential sampling scheme was added to the code to generate multiple images that included variations in the parameters of the measurement system and the object in a single execution of the code. The code is to serve multiple purposes; (1) to answer questions regarding the contribution of scattered photons to images, (2) for use in design optimization studies, and (3) to do up to second-order perturbation studies to assess the effects of design parameter variations and/or physical parameters of the object (the breast) without having to re-run the code for each set of varied parameters. The accuracy and fidelity of the code were validated by a large variety of benchmark studies using published data and also using experimental results from mammography phantoms on both …
Date: April 5, 2002
Creator: Verghese, Kuruvilla
Object Type: Report
System: The UNT Digital Library
Mammographic Imaging Studies Using the Monte Carlo Image Simulation-Differential Sampling (MCMIS-DS) Code (open access)

Mammographic Imaging Studies Using the Monte Carlo Image Simulation-Differential Sampling (MCMIS-DS) Code

This report summarizes the highlights of the research performed under the 1-year NEER grant from the Department of Energy. The primary goal of this study was to investigate the effects of certain design changes in the Fisher Senoscan mammography system and in the degree of breast compression on the discernability of microcalcifications in calcification clusters often observed in mammograms with tumor lesions. The most important design change that one can contemplate in a digital mammography system to improve resolution of calcifications is the reduction of pixel dimensions of the digital detector. Breast compression is painful to the patient and is though to be a deterrent to women to get routine mammographic screening. Calcification clusters often serve as markers (indicators ) of breast cancer.
Date: April 5, 2002
Creator: Verghese, K.
Object Type: Report
System: The UNT Digital Library
SYNTHESIS AND CHARACTERIZATION OF CO- AND H{sub 2}S-TOLERANT ELECTROCATALYSTS FOR PEM FUEL CELL (open access)

SYNTHESIS AND CHARACTERIZATION OF CO- AND H{sub 2}S-TOLERANT ELECTROCATALYSTS FOR PEM FUEL CELL

The present state-of-art Proton Exchange Membrane Fuel Cell (PEMFC) technology is based on platinum (Pt) as a catalyst for both the fuel (anode) and air (cathode) electrodes. This catalyst is highly active but susceptible to poisoning by CO, which may be present in the H{sub 2}-fuel used or may be introduced during the fuel processing. Presence of trace amount of CO and H{sub 2}S in the H{sub 2}-fuel poisons the anode irreversibly and decreases the performance of the PEMFCs. In an effort to reduce the Pt-loading and improve the PEMFC performance, we propose to synthesize a number of Pt-based binary, ternary, and quaternary electrocatalysts using Ru, Mo, Ir, Ni, and Co as a substitute for Pt. By fine-tuning the metal loadings and compositions of candidate electrocatalysts, we plan to minimize the cost and optimize the catalyst activity and performance in PEMFC. The feasibility of the novel electrocatalysts will be demonstrated in the proposed effort with gas phase CO and H{sub 2}S concentrations typical of those found in reformed fuel gas with coal/natural gas/methanol feedstocks. During this reporting period several tri-metallic electrocatalysts were synthesized using both ultra-sonication and conventional method. These catalysts (Pt/Ru/Mo, Pt/Ru/Ir, Pt/Ru/W, Ptr/Ru/Co, and Pt/Ru/Se on carbon) were …
Date: April 5, 2005
Creator: Ilias, Shamsuddin
Object Type: Report
System: The UNT Digital Library
Comparison of Fracture Methodologies for Flaw Stability Analysis of Storage Tanks (open access)

Comparison of Fracture Methodologies for Flaw Stability Analysis of Storage Tanks

Fracture mechanics methodologies for flaw stability analysis of a storage tank were compared in terms of the maximum stable through-wall flaw sizes or ''instability lengths.'' The comparison was made at a full range of stress loading at a specific set of mechanical properties of A285 carbon steel and with the actual tank configuration. The two general methodologies, the J-integral-tearing modulus (J-T) and the failure assessment diagram (FAD), and their specific estimation schemes were evaluated. A finite element analysis of a flawed tank was also performed for validating the J estimation scheme with curvature correction and for constructing the finite element-based FAD. The calculated instability crack lengths show that the J-T methodology that uses an estimated scheme, and the material-specific FAD, most closely approximate the result calculated with finite element analysis for the stress range that bounds those expected at the highest fill levels in the storage tanks. The results from the other FAD methods show instability lengths less than the J-T results over this range.
Date: April 5, 2004
Creator: LAM, POH-SANG
Object Type: Article
System: The UNT Digital Library