CDF: Run II Physics Projections (open access)

CDF: Run II Physics Projections

In March 2001, the Fermilab Tevatron will start a new physics run of p{bar p} collisions at {radical}s = 2.0 TeV. The CDF experiments will collect a data sample of 2 fb{sup {minus}1} in the first two years. In this paper the authors describe the B physics prospects at CDF during the upcoming run.
Date: December 20, 2000
Creator: Tanaka, Maashi
Object Type: Article
System: The UNT Digital Library
Charmed meson and onium production at the Tevatron (open access)

Charmed meson and onium production at the Tevatron

The authors report recent results of D*{sup {+-}} meson, J/{psi} and {Upsilon} production at the Fermilab Tevatron. They observe about 8,000 D*{sup {+-}} mesons reconstructed in the decay chain of D* {r_arrow} D{sub {pi}}{sup 0}, D{sup 0} {r_arrow} K{mu}+X. They measure the integrated D*{sup +} production cross section to be 347 {+-} 65(stat.) {+-} 58(sys.) nb for the rapidity range {vert_bar}{eta}(D*{sup +}){vert_bar} < 1.0 and the transverse momentum range p{sub T} (D*{sup +}) > 10 GeV/c. The measurement is slightly higher than the theoretical prediction, especially at lower pT range. We also measure the polarization of J/{psi} at production and find that the measured transverse polarization is not well explained by the color-octet model proposed to explain the anomalously high J/{psi} production cross section. We also present a new result on {Upsilon} production and polarization. Production of the {Upsilon} is consistent with being unpolarized.
Date: December 20, 2000
Creator: Nakaya, T.
Object Type: Article
System: The UNT Digital Library
DSNF AND OTHER WASTE FORM DEGRADATION ABSTRACTION (open access)

DSNF AND OTHER WASTE FORM DEGRADATION ABSTRACTION

The purpose of this analysis/model report (AMR) is to select and/or abstract conservative degradation models for DOE-(US. Department of Energy) owned spent nuclear fuel (DSNF) and the immobilized ceramic plutonium (Pu) disposition waste forms for application in the proposed monitored geologic repository (MGR) postclosure Total System Performance Assessment (TSPA). Application of the degradation models abstracted herein for purposes other than TSPA should take into consideration the fact that they are, in general, very conservative. Using these models, the forward reaction rate for the mobilization of radionuclides, as solutes or colloids, away from the waste fondwater interface by contact with repository groundwater can then be calculated. This forward reaction rate generally consists of the dissolution reaction at the surface of spent nuclear fuel (SNF) in contact with water, but the degradation models, in some cases, may also include and account for the physical disintegration of the SNF matrix. The models do not, however, account for retardation, precipitation, or inhibition of the migration of the mobilized radionuclides in the engineered barrier system (EBS). These models are based on the assumption that all components of the DSNF waste form are released congruently with the degradation of the matrix.
Date: December 20, 2000
Creator: Thornton, T.A.
Object Type: Report
System: The UNT Digital Library
Erosion/corrosion of machinable Tungsten in water. (open access)

Erosion/corrosion of machinable Tungsten in water.

It was recently discovered that significant erosion/corrosion occurs with machinable tungsten when exposed to water, particularly when the water has dissolved oxygen present. The problem was first discovered about 1 1/2 years ago when extensive corrosion was found inside the cooling channels of the L5-80 white-beam slits located in sector 3-ID-A. Figure 1 and Figure 2 show cut-away sections of the tungsten slit; the water passages are severely corroded from the cooling water used to cool the slit. The problem was brought to the attention of the world's two largest manufacturers of machinable tungsten, Mi-Tech Metals from Indianapolis, IN and Kulite Tungsten Corp. from East Rutherford, NJ. Neither company had any experience with this problem and were unaware that water could cause such significant corrosion, apparently the APS was the first customer to ever use the material in this fashion.
Date: December 20, 2000
Creator: Collins, J. T.
Object Type: Report
System: The UNT Digital Library
FEATURES, EVENTS, AND PROCESSES: SYSTEM-LEVEL AND CRITICALITY (open access)

FEATURES, EVENTS, AND PROCESSES: SYSTEM-LEVEL AND CRITICALITY

The primary purpose of this Analysis/Model Report (AMR) is to identify and document the screening analyses for the features, events, and processes (FEPs) that do not easily fit into the existing Process Model Report (PMR) structure. These FEPs include the 3 1 FEPs designated as System-Level Primary FEPs and the 22 FEPs designated as Criticality Primary FEPs. A list of these FEPs is provided in Section 1.1. This AMR (AN-WIS-MD-000019) documents the Screening Decision and Regulatory Basis, Screening Argument, and Total System Performance Assessment (TSPA) Disposition for each of the subject Primary FEPs. This AMR provides screening information and decisions for the TSPA-SR report and provides the same information for incorporation into a project-specific FEPs database. This AMR may also assist reviewers during the licensing-review process.
Date: December 20, 2000
Creator: McGregor, D.L.
Object Type: Report
System: The UNT Digital Library
High-frequency buncher and {phi}-{delta}E rotation for the {mu}{sup +}-{mu}{sup {minus}} source (open access)

High-frequency buncher and {phi}-{delta}E rotation for the {mu}{sup +}-{mu}{sup {minus}} source

None
Date: December 20, 2000
Creator: Neuffer, David
Object Type: Report
System: The UNT Digital Library
In Situ Template Generation for Zincophosphate Synthesis Leading to C2H7N4O-ZnPO4 Containing Template-to-Template N--H...O Hydrogen Bonds (open access)

In Situ Template Generation for Zincophosphate Synthesis Leading to C2H7N4O-ZnPO4 Containing Template-to-Template N--H...O Hydrogen Bonds

The synthesis, structure and some properties of C{sub 2}H{sub 7}N{sub 4}O {center_dot} ZnPO{sub 4} (guanylurea zinc phosphate) are reported. The cationic template was prepared in situ by partial hydrolysis of the neutral 2-cyanoguanidine starting material. The resulting structure contains a new, unprotonated, zincophosphate layer topology as well as unusual N-H-O template-to-template hydrogen bonds which help to stabilize a ''double sandwich'' of templating cations between the inorganic sheets. Crystal data: C{sub 2}H{sub 7}N{sub 4}O {center_dot} ZnPO{sub 4}, M{sub r} = 229.44, monoclinic, P2{sub 1}/c, a = 13.6453 (9) {angstrom}, b = 5.0716 (3) {angstrom}, c = 10.6005 (7) {angstrom}, {beta} = 95.918 (2){sup 0}, V = 729.7 (1) {angstrom}{sup 3}, R(F) = 0.034, wR(F) = 0.034.
Date: December 20, 2000
Creator: Harrison, William T. A.; Rodgers, Jennifer A.; Phillips, Mark L. F. & Nenoff, Tina M.
Object Type: Article
System: The UNT Digital Library
Laser Raster Conditioning of KDP and KDKP Crystals Using XeCl and ND:YAG Lasers (open access)

Laser Raster Conditioning of KDP and KDKP Crystals Using XeCl and ND:YAG Lasers

Laser conditioning by raster scanning KDP and DKDP crystals using Nd:YAG and XeCl excimer laser systems was demonstrated. The laser systems were evaluated to determine their respective feasibility of improving the damage thresholds of the harmonic materials for use on the National Ignition Facility (NIF). Crystals were first evaluated using an Nd:YAG laser (355 nm, 7.6 ns) by scanning 2 x 2 cm2 areas with sub-damage threshold fluences and then performing unconditioned (SA) damage tests at 355-nm in the respectively scanned regions. Subsequently, five KDP and DKDP samples of various damage quality were raster scanned in a similar fashion at MicroLas GmbH (Goettingen, Germany) using a commercial Lambda Physik Excimer system (XeCl, {lambda} = 308 nm, 20 ns). The samples treated in Germany were then tested at Livermore National Laboratory (LLNL) at 355 nm to demonstrate the excimer's potentia1 as an alternative conditioning source. The excimer scan results suggest that crystals can be treated at high fluence (50 Ycm2, 308-nm, 204s) levels without noticeable bulk damage. In addition, comparable conditioning is possible even with the fluence set at 30% of the 308-nm damage threshold. The laser damage tests with 355-nrn on the majority of the excimer laser-treated crystals demonstrates the …
Date: December 20, 2000
Creator: Staggs, M; Yan, M & Runkel, M
Object Type: Article
System: The UNT Digital Library
Material transfer system in support of the plutonium immobilization program (open access)

Material transfer system in support of the plutonium immobilization program

The Plutonium Immobilization Program requires development of the process and plant prototypic equipment to immobilize surplus plutonium in ceramic for long-term storage. Because of the hazardous nature of plutonium, it was necessary to develop a remotely operable materials transfer system which can function within the confines of a glovebox. In support of this work at LLNL, such a material transfer system (MTS) was developed. This paper presents both the mechanical and controls parts making up this system, and includes photographs of the key components and diagrams of their assemblies, as well as a description of the control sequence used to validate the MTS capabilities.
Date: December 20, 2000
Creator: Pak, D
Object Type: Article
System: The UNT Digital Library
Near Infrared (NIR) Imaging Techniques Using Lasers and Nonlinear Crystal Optical Parametric Oscillator/Amplifier (OPO/OPA) Imaging and Transferred Electron (TE) Photocathode Image Intensifiers (open access)

Near Infrared (NIR) Imaging Techniques Using Lasers and Nonlinear Crystal Optical Parametric Oscillator/Amplifier (OPO/OPA) Imaging and Transferred Electron (TE) Photocathode Image Intensifiers

Laboratory experiments utilizing different near-infrared (NIR) sensitive imaging techniques for LADAR range gated imaging at eye-safe wavelengths are presented. An OPO/OPA configuration incorporating a nonlinear crystal for wavelength conversion of 1.56 micron probe or broadcast laser light to 807 nm light by utilizing a second pump laser at 532 nm for gating and gain, was evaluated for sensitivity, resolution, and general image quality. These data are presented with similar test results obtained from an image intensifier based upon a transferred electron (TE) photocathode with high quantum efficiency (QE) in the 1-2 micron range, with a P-20 phosphor output screen. Data presented include range-gated imaging performance in a cloud chamber with varying optical attenuation of laser reflectance images.
Date: December 20, 2000
Creator: Yates, George J.; Mcdonald, Thomas E., Jr.; Bliss, David E.; Cameron, Stewart M.; Greives, Kenneth H. & Zutavern, Fred J.
Object Type: Article
System: The UNT Digital Library
Neutron detection and characterization for non-proliferation applications using 3D computer optical memories [Use of 3D optical computer memory for radiation detectors/dosimeters. Final progress report] (open access)

Neutron detection and characterization for non-proliferation applications using 3D computer optical memories [Use of 3D optical computer memory for radiation detectors/dosimeters. Final progress report]

We have investigated 3-dimensional optical random access memory (3D-ORAM) materials for detection and characterization of charged particles of neutrons by detecting tracks left by the recoil charged particles produced by the neutrons. We have characterized the response of these materials to protons, alpha particles and carbon-12 nuclei as a functions of dose and energy. We have observed individual tracks using scanning electron microscopy and atomic force microscopy. We are investigating the use of neural net analysis to characterize energetic neutron fields from their track structure in these materials.
Date: December 20, 2000
Creator: Phillips, Gary W.
Object Type: Report
System: The UNT Digital Library
PROMOTED ZINC CHROMITE CATALYSTS FOR HIGHER ALCOHOL SYNTHESIS (open access)

PROMOTED ZINC CHROMITE CATALYSTS FOR HIGHER ALCOHOL SYNTHESIS

During this reporting period, a ''zinc chromite'' catalyst promoted with 6 wt.% cesium (Cs) was evaluated at the following operating conditions: Temperature - 375 C and 400 C; Total Pressure--13.6 MPa (2000 psig); Gas Hourly Space Velocity (GHSV) - 5000 standard liters/kg(cat)-hr; and H{sub 2}/CO feed ratio--0.5, 1.0 and 2.0 mole/mole. Decahydronaphthalene (DHN) was used as the slurry liquid. The experiment lasted for twelve days of continuous operation. Unpromoted zinc chromite catalyst then was re-examined under the same operating conditions. Reproducible data was achieved with a continuous liquid make-up. Compared with unpromoted zinc chromite catalyst, 6 wt.% Cs-promoted catalyst shifted the product distribution from methanol to higher alcohols, even though methanol was still the major product. The effect of operating conditions was less important than the addition of promoter. However, it was observed that higher temperature favors higher alcohol synthesis, and that a higher H{sub 2}/CO ratio leads to lower oxygenates selectivity and higher hydrocarbons selectivity. These trends showed clearly with the Cs-promoted catalyst, but were not as prominent with the unpromoted catalyst. The slurry liquid did not decompose or alkylate to a measurable extent during either continuous, 12 - day experiment, even with the higher reactor temperature (400 C). …
Date: December 20, 2000
Creator: Sun, Ms. Xiaolei & Roberts, Professor George W.
Object Type: Report
System: The UNT Digital Library
Range-Gated LADAR Coherent Imaging Using Parametric Up-Conversion of IR and NIR Light for Imaging with a Visible-Range Fast-Shuttered Intensified Digital CCD Camera (open access)

Range-Gated LADAR Coherent Imaging Using Parametric Up-Conversion of IR and NIR Light for Imaging with a Visible-Range Fast-Shuttered Intensified Digital CCD Camera

Research is presented on infrared (IR) and near infrared (NIR) sensitive sensor technologies for use in a high speed shuttered/intensified digital video camera system for range-gated imaging at ''eye-safe'' wavelengths in the region of 1.5 microns. The study is based upon nonlinear crystals used for second harmonic generation (SHG) in optical parametric oscillators (OPOS) for conversion of NIR and IR laser light to visible range light for detection with generic S-20 photocathodes. The intensifiers are ''stripline'' geometry 18-mm diameter microchannel plate intensifiers (MCPIIS), designed by Los Alamos National Laboratory and manufactured by Philips Photonics. The MCPIIS are designed for fast optical shattering with exposures in the 100-200 ps range, and are coupled to a fast readout CCD camera. Conversion efficiency and resolution for the wavelength conversion process are reported. Experimental set-ups for the wavelength shifting and the optical configurations for producing and transporting laser reflectance images are discussed.
Date: December 20, 2000
Creator: Yates, George J.; Mcdonald, Thomas E., Jr.; Bliss, David E.; Cameron, Stewart M. & Zutavern, Fred J.
Object Type: Article
System: The UNT Digital Library
Seepage Model for PA Including Dift Collapse (open access)

Seepage Model for PA Including Dift Collapse

The purpose of this Analysis/Model Report (AMR) is to document the predictions and analysis performed using the Seepage Model for Performance Assessment (PA) and the Disturbed Drift Seepage Submodel for both the Topopah Spring middle nonlithophysal and lower lithophysal lithostratigraphic units at Yucca Mountain. These results will be used by PA to develop the probability distribution of water seepage into waste-emplacement drifts at Yucca Mountain, Nevada, as part of the evaluation of the long term performance of the potential repository. This AMR is in accordance with the ''Technical Work Plan for Unsaturated Zone (UZ) Flow and Transport Process Model Report'' (CRWMS M&O 2000 [153447]). This purpose is accomplished by performing numerical simulations with stochastic representations of hydrological properties, using the Seepage Model for PA, and evaluating the effects of an alternative drift geometry representing a partially collapsed drift using the Disturbed Drift Seepage Submodel. Seepage of water into waste-emplacement drifts is considered one of the principal factors having the greatest impact of long-term safety of the repository system (CRWMS M&O 2000 [153225], Table 4-1). This AMR supports the analysis and simulation that are used by PA to develop the probability distribution of water seepage into drift, and is therefore a …
Date: December 20, 2000
Creator: Li, G. & Tsang, C.
Object Type: Report
System: The UNT Digital Library
Spent Nuclear Fuel (SNF) Project Acceptance Criteria for Light Water Reactor Spent Fuel Storage System [OCRWM PER REV2] (open access)

Spent Nuclear Fuel (SNF) Project Acceptance Criteria for Light Water Reactor Spent Fuel Storage System [OCRWM PER REV2]

As part of the decommissioning of the 324 Building Radiochemical Engineering Cells there is a need to remove commercial Light Water Reactor (LWR) spent nuclear fuel (SNF) presently stored in these hot cells. To enable fuel removal from the hot cells, the commercial LWR SNF will be packaged and shipped to the 200 Area Interim Storage Area (ISA) in a manner that satisfies site requirements for SNF interim storage. This document identifies the criteria that the 324 Building Radiochemical Engineering Cell Clean-out Project must satisfy for acceptance of the LWR SNF by the SNF Project at the 200 Area ISA. In addition to the acceptance criteria identified herein, acceptance is contingent on adherence to applicable Project Hanford Management Contract requirements and procedures in place at the time of work execution.
Date: December 20, 2000
Creator: Johnson, D. M.
Object Type: Report
System: The UNT Digital Library
Status of CDF Run II Upgrade (open access)

Status of CDF Run II Upgrade

For the past several years, the CDF collaboration has been upgrading its detector to accommodate the higher luminosity and beam energy expected during Run II (2001-2006) at the Tevatron p{bar p} collider. Accelerator improvements include increasing the instantaneous luminosity by an order of magnitude with respect to Run I to 2 x 10{sup 32} cm{sup {minus}2} s{sup {minus}1} and increasing the center of mass energy from 1.8 TeV to 2.0 TeV. The detector upgrades include replacing the entire tracking volume, extending the muon coverage, adding a time of flight system, and improving the selection capabilities of the trigger. The partially instrumented detector underwent a commissioning run during September/October 2000 in preparation for starting data taking in Spring 2001 with the full detector. Now that Run II has been extended through 2006, we expect to collect an integrated luminosity of 2 fb{sup {minus}1} during the first two years of running and up to a total of 15 fb{sup {minus}1} by the end of Run II.
Date: December 20, 2000
Creator: Cranshaw, Jack
Object Type: Article
System: The UNT Digital Library
Tectonic Setting and Characteristics of Natural Fractures in MesaVerde and Dakota Reservoirs of the San Juan Basin (open access)

Tectonic Setting and Characteristics of Natural Fractures in MesaVerde and Dakota Reservoirs of the San Juan Basin

The Cretaceous strata that fill the San Juan Basin of northwestern New Mexico and southwestern Colorado were shortened in a generally N-S to NN13-SSW direction during the Laramide orogeny. This shortening was the result of compression of the strata between southward indentation of the San Juan Uplift at the north edge of the basin and northward to northeastward indentation of the Zuni Uplift from the south. Right-lateral strike-slip motion was concentrated at the eastern and western basin margins of the basin to form the Hogback Monocline and the Nacimiento Uplift at the same time, and small amounts of shear may have been pervasive within the basin as well. Vertical extension fractures, striking N-S to NNE-SSW with local variations (parallel to the Laramide maximum horizontal compressive stress), formed in both Mesaverde and Dakota sandstones under this system, and are found in outcrops and in the subsurface of the San Juan Basin. The immature Mesaverde sandstones typically contain relatively long, irregular, vertical extension fractures, whereas the quartzitic Dakota sandstones contain more numerous, shorter, sub-parallel, closely spaced, extension fractures. Conjugate shear planes in several orientations are also present locally in the Dakota strata.
Date: December 20, 2000
Creator: Lorenz, John C. & Cooper, Scott P.
Object Type: Article
System: The UNT Digital Library
Transformation of UREX effluents to solid oxides by concentration, denitration, and calcination. (open access)

Transformation of UREX effluents to solid oxides by concentration, denitration, and calcination.

A literature survey was conducted on the potential means for converting two aqueous streams from the UREX process to solid oxides. The UREX process is similar to the PUREX solvent-extractions process and is designed to separate U, Tc, and I from the transuranics and other fission products contained in spent fuel. It was determined that converting these waste streams to oxides is technically feasible by a combination of evaporation, denitration, and calcination.
Date: December 20, 2000
Creator: Vandegrift, G.F.
Object Type: Report
System: The UNT Digital Library
Ultrahigh Resolution Multicolor Colocalization of Single Fluorescent Nanocrystals (open access)

Ultrahigh Resolution Multicolor Colocalization of Single Fluorescent Nanocrystals

A new method for in vitro and possibly in vivo ultrahigh-resolution colocalization and distance measurement between biomolecules is described, based on semiconductor nanocrystal probes. This ruler bridges the gap between FRET and far-field (or near-field scanning optical microscope) imaging and has a dynamic range from few nanometers to tens of micrometers. The ruler is based on a stage-scanning confocal microscope that allows the simultaneous excitation and localization of the excitation point-spread-function (PSF) of various colors nanocrystals while maintaining perfect registry between the channels. Fit of the observed diffraction and photophysics-limited images of the PSFs with a two-dimensional Gaussian allows one to determine their position with nanometer accuracy. This new high-resolution tool opens new windows in various molecular, cell biology and biotechnology applications.
Date: December 20, 2000
Creator: Michalet, X.; Lacoste, T. D.; Pinaud, F.; Chemla, D. S.; Alivisatos, A. P. & Weiss, S.
Object Type: Article
System: The UNT Digital Library
Unsaturated Zone and Saturated Zone Transport Properties (U0100) (open access)

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

This Analysis/Model Report (AMR) summarizes transport properties for the lower unsaturated zone hydrogeologic units and the saturated zone at Yucca Mountain and provides a summary of data from the Busted Butte Unsaturated Zone Transport Test (UZTT). The purpose of this report is to summarize the sorption and transport knowledge relevant to flow and transport in the units below Yucca Mountain and to provide backup documentation for the sorption parameters decided upon for each rock type. Because of the complexity of processes such as sorption, and because of the lack of direct data for many conditions that may be relevant for Yucca Mountain, data from systems outside of Yucca Mountain are also included. The data reported in this AMR will be used in Total System Performance Assessment (TSPA) calculations and as general scientific support for various Process Model Reports (PMRs) requiring knowledge of the transport properties of different materials. This report provides, but is not limited to, sorption coefficients and other relevant thermodynamic and transport properties for the radioisotopes of concern, especially neptunium (Np), plutonium (Pu), Uranium (U), technetium (Tc), iodine (I), and selenium (Se). The unsaturated-zone (UZ) transport properties in the vitric Calico Hills (CHv) are discussed, as are colloidal …
Date: December 20, 2000
Creator: Conca, J.
Object Type: Report
System: The UNT Digital Library
Characterization of oxidation products on a ZrFe{sub 2}-type laves intermetallic exposed to 200{degree}C steam. (open access)

Characterization of oxidation products on a ZrFe{sub 2}-type laves intermetallic exposed to 200{degree}C steam.

The release of radioactive elements from the stainless steel-15 wt% zirconium (SS-15Zr) metal waste form will be governed by the corrosion behavior of ZrFe{sub 2}-type intermetallics phases present in the alloy. In this article, oxidation products that formed on a ZrFe{sub 2}-type intermetallic sample exposed to 200 C steam were characterized by Auger Electron Spectroscopy (AES) and Transmission Electron Microscopy (TEM). The data revealed two oxide layers on the sample surface: an outer crystalline iron-oxide layer and an inner amorphous zirconium-rich layer believed to be zirconium oxide. Thermodynamic considerations indicate that the zirconium-rich layer formed first. The iron-oxide layer appears to have resulted from the diffusion of iron through the zirconium-rich layer to the oxide-vapor interface.
Date: November 20, 2000
Creator: Abraham, D. P.; Dietz, N. & Finnegan, N.
Object Type: Article
System: The UNT Digital Library
Cold Vacuum Drying (CVD) Facility Electrical System Captor and Dapper Study (open access)

Cold Vacuum Drying (CVD) Facility Electrical System Captor and Dapper Study

The objective of this report is to Validate and as-build the Load and Fault hand calculations performed by Meier Associates. Perform a protective device coordination study, not performed by Meier's, and furnish any recommendations, including recommended device settings. Perform Transient Motor Starting (TMS) analysis for the chillers and also the motors on the standby generator system. Indicate any design problems or NEC Code Violations, if found.
Date: November 20, 2000
Creator: Singh, G.
Object Type: Report
System: The UNT Digital Library
Final report for ER54440, ''Measurement and modeling of low energy (910 to 1000 eV) sputtering and reflection'' (open access)

Final report for ER54440, ''Measurement and modeling of low energy (910 to 1000 eV) sputtering and reflection''

This report is a compilation of the three annual progress reports. All detail can be found in the refereed publications enumerated within.
Date: November 20, 2000
Creator: Ruzic, David N.
Object Type: Report
System: The UNT Digital Library
Final report for''FOSPACK'' (open access)

Final report for''FOSPACK''

The goal of this subcontract was to modify the FOSPACK code, developed by John Ruge, to call the BoomerAMG solver developed at LLNL through the HYPRE interface. FOSPACK is a package developed for the automatic discretization and solution of First-Order System Least-Squares (FOSLS) formulations of 2D partial differential equations (c.f [3-9]). FOSPACK takes a user-specified mesh (which can be an unstructured combination of triangular and quadrilateral elements) and specification of the first-order system, and produces the discretizations needed for solution. Generally, all specifications are contained in data files, so no re-compilation is necessary when changing domains, mesh sizes, problems, etc. Much of the work in FOSPACK has gone into an interpreter that allows for simple, intuitive specification of the equations. The interpreter reads the equations, processes them, and stores them as instruction lists needed to apply the operators involved to finite element basis functions, allowing assembly of the discrete system. Quite complex equations may be specified, including variable coefficients, user defined functions, and vector notation. The first-order systems may be nonlinear, with linearizations either performed automatically, or specified in a convenient way by the user. The program also includes global/local refinement capability. FOSLS formulations are very well suited for solution …
Date: November 20, 2000
Creator: Ruge, J W & Dean, D
Object Type: Report
System: The UNT Digital Library