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2003 Chemical Engineering Division annual technical report.

Description: The Chemical Engineering Division is one of six divisions within the Engineering Research Directorate at Argonne National Laboratory, one of the U.S. government's oldest and largest research laboratories. The University of Chicago oversees the laboratory on behalf of the U.S. Department of Energy (DOE). Argonne's mission is to conduct basic scientific research, to operate national scientific facilities, to enhance the nation's energy resources, to promote national security, and to develop bette… more
Date: April 26, 2004
Creator: Lewis, D.; Graziano, D.; Miller, J. F. & Vandegrift, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ab initio study of low-energy electron collisions withtertafluoroethene, C2F4

Description: We report the results of variational calculations of elastic electron scattering by tetrafluoroethene, C{sub 2}F{sub 4}, with incident electron energies ranging from 0.5 to 20 eV, using the complex Kohn method and effective core potentials. These are the first fully calculations to reproduce experimental angular differential cross sections at energies below 10 eV. Low-energy electron scattering by C{sub 2}F{sub 4} is sensitive to the inclusion of electronic correlation and target-distortion eff… more
Date: April 26, 2004
Creator: Trevisan, C. S.; Orel, A. E. & Rescigno, Thomas N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Active control for turbulent premixed flame simulations

Description: Many turbulent premixed flames of practical interest are statistically stationary. They occur in combustors that have anchoring mechanisms to prevent blow-off and flashback. The stabilization devices often introduce a level of geometric complexity that is prohibitive for detailed computational studies of turbulent flame dynamics. As a result, typical detailed simulations are performed in simplified model configurations such as decaying isotropic turbulence or inflowing turbulence. In these conf… more
Date: March 26, 2004
Creator: Bell, John B.; Day, Marcus S.; Grcar, Joseph F. & Lijewski, Michael J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Adaptive Sampling for Noisy Problems

Description: The usual approach to deal with noise present in many real-world optimization problems is to take an arbitrary number of samples of the objective function and use the sample average as an estimate of the true objective value. The number of samples is typically chosen arbitrarily and remains constant for the entire optimization process. This paper studies an adaptive sampling technique that varies the number of samples based on the uncertainty of deciding between two individuals. Experiments dem… more
Date: March 26, 2004
Creator: Cantu-Paz, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Advanced Hydrogen Transport Membranes for Vision 21 Fossil Fuel Plants

Description: During this quarter, work was focused on testing layered composite membranes under varying feed stream flow rates at high pressure. By optimizing conditions, H{sub 2} permeation rates as high as 423 mL {center_dot} min{sup -1} {center_dot} cm{sup -2} at 440 C were measured. Membrane stability was investigated by comparison to composite alloy membranes. Permeation of alloyed membranes showed a strong dependence on the alloying element. Impedance analysis was used to investigate bulk and grain bo… more
Date: July 26, 2004
Creator: Evenson, Carl R.; Sammells, Anthony F.; Mackay, Richard; Treglio, Richard; Rolfe, Sara L.; Blair, Richard et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced Hydrogen Transport Membranes for Vision 21 Fossil Fuel Plants

Description: During this quarter, work was focused on testing layered composite membranes under varying feed stream flow rates at high pressure. By optimizing conditions, H{sub 2} permeation rates in excess of 400 mL {center_dot} min{sup -1} {center_dot} cm{sup -2} at 440 C were measured. Membrane stability was characterized by repeated thermal and pressure cycling. The effect of cermet grain size on permeation was determined. Finally, progress is summarized on thin film cermet fabrication, catalyst develop… more
Date: April 26, 2004
Creator: Evenson, Carl R.; Sammells, Anthony F.; Mackay, Richard; Morrison, Scott R.; Rolfe, Sara L.; Blair, Richard et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An algebraic sub-structuring method for large-scale eigenvaluecalculation

Description: We examine sub-structuring methods for solving large-scalegeneralized eigenvalue problems from a purely algebraic point of view. Weuse the term "algebraic sub-structuring" to refer to the process ofapplying matrix reordering and partitioning algorithms to divide a largesparse matrix into smaller submatrices from which a subset of spectralcomponents are extracted and combined to provide approximate solutions tothe original problem. We are interested in the question of which spectralcomponentsone… more
Date: May 26, 2004
Creator: Yang, C.; Gao, W.; Bai, Z.; Li, X.; Lee, L.; Husbands, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LOS ANGELES DEPARTMENT OF WATER AND POWER FUEL CELL DEMONSTRATION PROJECT

Description: The Los Angeles Department of Water and Power (LADWP) is currently one of the most active electric utility companies in deploying fuel cell technology. Fuel cells offer many benefits and are now used as an alternative to traditional internal combustion engines in power generation. In continuing it's role as the leader in fuel cell deploying, LADWP installed a Phosphoric Acid Fuel Cell (PAFC) in February 2002 at its Main Street service center. The goal of this project is to evaluate the PAFC's p… more
Date: March 26, 2004
Creator: Glauz, William W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Approximate Integrals of rf-driven Particle Motion in Magnetic Field

Description: For a particle moving in nonuniform magnetic field under the action of an rf wave, ponderomotive effects result from rf-driven oscillations nonlinearly coupled with Larmor rotation. Using Lagrangian and Hamiltonian formalism, we show how, despite this coupling, two independent integrals of the particle motion are approximately conserved. Those are the magnetic moment of free Larmor rotation and the quasi-energy of the guiding center motion parallel to the magnetic field. Under the assumption of… more
Date: April 26, 2004
Creator: Dodin, I. Y. & Fisch, N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Automated Image Data Exploitation Final Report

Description: The automated production of maps of human settlement from recent satellite images is essential to detailed studies of urbanization, population movement, and the like. Commercial satellite imagery is becoming available with sufficient spectral and spatial resolution to apply computer vision techniques previously considered only for laboratory (high resolution, low noise) images. In this project, we extracted the boundaries of human settlements from IKONOS 4-band and panchromatic images using spe… more
Date: January 26, 2004
Creator: Kamath, C; Poland, D; Sengupta, S K & Futterman, J H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Automatic Blocking Of QR and LU Factorizations for Locality

Description: QR and LU factorizations for dense matrices are important linear algebra computations that are widely used in scientific applications. To efficiently perform these computations on modern computers, the factorization algorithms need to be blocked when operating on large matrices to effectively exploit the deep cache hierarchy prevalent in today's computer memory systems. Because both QR (based on Householder transformations) and LU factorization algorithms contain complex loop structures, few co… more
Date: March 26, 2004
Creator: Yi, Q; Kennedy, K; You, H; Seymour, K & Dongarra, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Calcium Carbonate Production by Coccolithophorid Algae in Long Term, Carbon Dioxide Sequestration

Description: Predictions of increasing levels of anthropogenic carbon dioxide (CO{sub 2}) and the specter of global warming have intensified research efforts to identify ways to sequester carbon. A number of novel avenues of research are being considered, including bioprocessing methods to promote and accelerate biosequestration of CO{sub 2} from the environment through the growth of organisms such as coccolithophorids, which are capable of sequestering CO{sub 2} relatively permanently. Calcium and magnesiu… more
Date: April 26, 2004
Creator: Fabry, V. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The CMS integration grid testbed

Description: The CMS Integration Grid Testbed (IGT) comprises USCMS Tier-1 and Tier-2 hardware at the following sites: the California Institute of Technology, Fermi National Accelerator Laboratory, the University of California at San Diego, and the University of Florida at Gainesville. The IGT runs jobs using the Globus Toolkit with a DAGMan and Condor-G front end. The virtual organization (VO) is managed using VO management scripts from the European Data Grid (EDG). Gridwide monitoring is accomplished usin… more
Date: August 26, 2004
Creator: Graham, Gregory E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Comparison of Measured and Calculated Gamma Ray Attenuation for a Common Counting Geometry

Description: In order to perform quantitative gamma spectroscopy, it is necessary to know the sample-specific detection efficiency for photons as a function of energy. The detection efficiency, along with the branching ratio for the isotope and gamma ray of interest, is used to convert observed counts/second to actual disintegrations/second, and, hence, has a large effect on the accuracy of the measurement. In cases where the geometry of the source is simple and reproducible, such as a point source, small v… more
Date: February 26, 2004
Creator: Gaylord, R. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Composite Amplitude Modulated Phase Only Filter Based Detection and Tracking of the Back-Reflection of KDP Images

Description: An algorithm for determining the position of the KDP back-reflection image was developed. It was compared to a centroid-based algorithm. While the algorithm based on centroiding exhibited a radial standard deviation of 9 pixels, the newly proposed algorithm based on classical matched filtering (CMF) and a Gaussian fit to correlation peak provided a radial standard deviation of less than 1 pixel. The speed of the peak detection was improved from an average of 5.5 seconds for Gaussian fit to 0.02… more
Date: August 26, 2004
Creator: Awwal, A. S.; McClay, W. A.; Ferguson, S. W.; Candy, J. V.; Salmon, J. T. & Wegner, P. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Computational Combustion

Description: Progress in the field of computational combustion over the past 50 years is reviewed. Particular attention is given to those classes of models that are common to most system modeling efforts, including fluid dynamics, chemical kinetics, liquid sprays, and turbulent flame models. The developments in combustion modeling are placed into the time-dependent context of the accompanying exponential growth in computer capabilities and Moore's Law. Superimposed on this steady growth, the occasional sudd… more
Date: August 26, 2004
Creator: Westbrook, C. K.; Mizobuchi, Y.; Poinsot, T. J.; Smith, P. J. & Warnatz, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

DEPENDENCY OF SULFATE SOLUBILITY ON MELT COMPOSITION AND MELT POLYMERIZATION

Description: Sulfate and sulfate salts are not very soluble in borosilicate waste glass. When sulfate is present in excess it can form water soluble secondary phases and/or a molten salt layer (gall) on the melt pool surface which is purported to cause steam explosions in slurry fed melters. Therefore, sulfate can impact glass durability while formation of a molten salt layer on the melt pool can impact processing. Sulfate solubility has been shown to be compositionally dependent in various studies, (e.g. ,… more
Date: July 26, 2004
Creator: JANTZEN, CAROLM.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Derivation Of Probabilistic Damage Definitions From High Fidelity Deterministic Computations

Description: This paper summarizes a methodology used by the Underground Analysis and Planning System (UGAPS) at Lawrence Livermore National Laboratory (LLNL) for the derivation of probabilistic damage curves for US Strategic Command (USSTRATCOM). UGAPS uses high fidelity finite element and discrete element codes on the massively parallel supercomputers to predict damage to underground structures from military interdiction scenarios. These deterministic calculations can be riddled with uncertainty, especial… more
Date: October 26, 2004
Creator: Leininger, L D
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Design and Construction of a Fast Ion Loss Faraday Cup Array Diagnostic for JET

Description: A thin foil Faraday cup array is being built to measure the loss of 3.5 MeV alpha particles and MeV ion cyclotron heating (ICH) tail ions on JET. It will consist of nine detectors spread over five different poloidal locations and three radial positions. They will measure the poloidal distribution and radial scrape off of the losses. The detectors will be comprised of four layers of thin (2.5 micron) Ni foil, giving some resolution of the lost particle energy distribution as different ranges of … more
Date: April 26, 2004
Creator: Darrow, D. S.; Bauumel, S.; Cecil, F. E.; Kiptily, V.; Ellis, R.; Pedrick, L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DETECTION OF UNAUTHORIZED CONSTRUCTION EQUIPMENT IN PIPELINE RIGHT-OF-WAYS

Description: Natural gas transmission companies mark the right-of-way areas where pipelines are buried with warning signs to prevent accidental third-party damage. Nevertheless, pipelines are sometimes damaged by third-party construction equipment. A single incident can be devastating, causing death and millions of dollars of property loss. This damage would be prevented if potentially hazardous construction equipment could be detected, identified, and an alert given before the pipeline was damaged. The Gas… more
Date: July 26, 2004
Creator: Huebler, James E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development and Demonstration of Insulated Pressure Vessels for Vehicular Hydrogen Storage

Description: This paper describes the development of an alternative technology for vehicular storage of hydrogen. Insulated pressure vessels are cryogenic-capable pressure vessels that can accept cryogenic liquid fuel, cryogenic compressed gas or compressed gas at ambient temperature. Insulated pressure vessels offer advantages over alternative hydrogen storage technologies. Insulated pressure vessels are more compact and less expensive than compressed hydrogen vessels. They have lower evaporative losses an… more
Date: February 26, 2004
Creator: Berry, G D & Aceves, S M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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