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in subjects: "Algorithms."

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Physical effects of infrared quark eigenmodes in LQCD

A truncated determinant algorithm is used to study the physical effects of the quark eigenmodes associated with eigenvalues below 300 MeV. This initial study focuses on coarse lattices (with O(a{sup 2}) improved gauge action), light internal quark masses and large physical volumes. Four bellweather full QCD processes are discussed: topological charge distributions, the eta prime propagator, string breaking as observed in the static energy and the rho decay into two pions.

Date: October 7, 1999

Creator: A. Duncan, E. Eichten and H. Thacker

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Unquenched Studies Using the Truncated Determinant Algorithm

A truncated determinant algorithm is used to study the physical effects of the quark eigenmodes associated with eigenvalues below 420 MeV. This initial high statistics study focuses on coarse (6{sup 4}) lattices (with O(a{sup 2}) improved gauge action), light internal quark masses and large physical volumes. Three features of full QCD are examined: topological charge distributions, string breaking as observed in the static energy and the eta prime mass.

Date: November 29, 2001

Creator: A. Duncan, E. Eichten and H. Thacker

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

DATA SUMMARY REPORT SMALL SCALE MELTER TESTING OF HLW ALGORITHM GLASSES MATRIX1 TESTS VSL-07S1220-1 REV 0 7/25/07

Eight tests using different HLW feeds were conducted on the DM100-BL to determine the effect of variations in glass properties and feed composition on processing rates and melter conditions (off-gas characteristics, glass processing, foaming, cold cap, etc.) at constant bubbling rate. In over seven hundred hours of testing, the property extremes of glass viscosity, electrical conductivity, and T{sub 1%}, as well as minimum and maximum concentrations of several major and minor glass components w… more

Date: December 29, 2011

Creator: AA, KRUGER; KS, MATLACK & IL, PEGG

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Location Algorithms and Errors in Time-of-Arrival Systems

This report describes least squares solution methods and linearized estimates of solution errors caused by data errors. These methods are applied to event locating systems which use time-of-arrival (TOA) data. Analyses are presented for algorithms that use the TOA data in a ''direct'' manner and for algorithms utilizing Time-of-arrival Squared (TSQ) methods. Location and error estimation results were applied to a ''typical'' satellite TOA detecting system. Using Monte Carlo methods, it was foun… more

Date: September 1, 2001

Creator: AARONSON, EUGENE A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Periodic Boundary Conditions in the ALEGRA Finite Element Code

This document describes the implementation of periodic boundary conditions in the ALEGRA finite element code. ALEGRA is an arbitrary Lagrangian-Eulerian multi-physics code with both explicit and implicit numerical algorithms. The periodic boundary implementation requires a consistent set of boundary input sets which are used to describe virtual periodic regions. The implementation is noninvasive to the majority of the ALEGRA coding and is based on the distributed memory parallel framework in AL… more

Date: November 1, 1999

Creator: AIDUN,JOHN B.; ROBINSON,ALLEN C. & WEATHERBY,JOE R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fast Grid Search Algorithm for Seismic Source Location

The spatial and temporal origin of a seismic energy source are estimated with a first grid search technique. This approach has greater likelihood of finding the global rninirnum of the arrival time misiit function compared with conventional linearized iterative methods. Assumption of a homogeneous and isotropic seismic velocity model allows for extremely rapid computation of predicted arrival times, but probably limits application of the method to certain geologic environments and/or recording … more

Date: July 1, 2000

Creator: ALDRIDGE,DAVID F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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An Order-of-Magnitude Estimation of Benzene Concentration in Saltstone Vault

The contents of Tank 48 that include the tetraphenylborate (TPB) precipitates of potassium and cesium will be grouted and stored in the Saltstone vault. The grouting process is exothermic, which should accelerate the decomposition of TPB precipitates eventually to benzene. Because the vault is not currently outfitted with an active ventilation system, there is a concern that a mixture of flammable gases may form in the vapor space of each cell filled with the curing grout. The purpose of this s… more

Date: February 28, 2005

Creator: ALEXANDER, CHOI

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Cloud to CAD

This paper documents work performed to convert scanned range data to CAD solid model representation. The work successfully developed surface fitting algorithms for quadric surfaces (e.g. plane, cone, cylinder, and sphere), and a segmentation algorithm based entirely on surface type, rather than on a differential metric like Gaussian curvature. Extraction of all CAD-required parameters for quadric surface representation was completed. Approximate face boundaries derived from the original point c… more

Date: May 1, 2001

Creator: AMES,ARLO L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

DEVELOPMENT OF A THERMAL EQUILIBRIUM PREDICTION ALGORITHM

No Description Available.

Date: December 1, 2001

Creator: AVILES-RAMOS, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics

The Large Hadron Collider (LHC) at CERN promises a major step forward in the understanding of the fundamental nature of matter. The ATLAS experiment is a general-purpose detector for the LHC, whose design was guided by the need to accommodate the wide spectrum of possible physics signatures. The major remit of the ATLAS experiment is the exploration of the TeV mass scale where groundbreaking discoveries are expected. In the focus are the investigation of the electroweak symmetry breaking and li… more

Date: November 28, 2011

Creator: Aad, G.; Abat, E.; Abbott, B.; Abdallah, J.; Abdelalim, A. A.; Abdesselam, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Search for New Heavy Particles Decaying to Z0 Z0 to llll, lljj in p pbar Collisions at Sqrt(s) = 1.96 TeV

We report on a search for anomalous production of Z pairs through a massive resonance decay in data corresponding to 2.5-2.9 fb{sup -1} of integrated luminosity in p{bar p} collisions at {radical}s = 1.96 TeV using the CDF II detector at the Fermilab Tevatron. This analysis, with more data and channels where the Z bosons decay to muons or jets, supersedes the 1.1 fb{sup -1} four-electron channel result previously published by CDF. In order to maintain high efficiency for muons, we use a new for… more

Date: February 1, 2011

Creator: Aaltonen, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Global Search for New Physics with 2.0 fb88-1 at CDF

Data collected in Run II of the Fermilab Tevatron are searched for indications of new electroweak-scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with the standard model prediction. A model-independent approach (VISTA) considers gross features of the data, and is sensitive to new large cross-section physics. Further sensitivity to new physics is provided by two additional algorithms: a Bump Hunter searches invariant mass distribut… more

Date: September 1, 2008

Creator: Aaltonen, T.; Adelman, J.; Akimoto, T.; Albrow, Michael G.; Alvarez Gonzalez, B.; Amerio, S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Search for Technicolor Particles Produced in Association with a W Boson at CDF

We present a search for the technicolor particles {rho}{sub T} and {pi}{sub T} in the process p{bar p} {yields} {rho}{sub T} {yields} W{pi}{sub T} at a center of mass energy of {radical}s = 1.96 TeV. The search uses a data sample corresponding to approximately 1.9 fb{sup -1} of integrated luminosity accumulated by the CDF II detector at the Fermilab Tevatron. The event signature we consider is W {yields} {ell}{nu} and {pi}{sub T} {yields} b{bar b}, b{bar c} or b{bar u} depending on the {pi}{sub… more

Date: December 1, 2009

Creator: Aaltonen, T.; Adelman, J.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of the Top Quark Mass in the All-Hadronic Mode at CDF

A measurement of the top quark mass (M{sub top}) in the all-hadronic decay channel is presented. It uses 5.8 fb{sup -1} of p{bar p} data collected with the CDF II detector at the Fermilab Tevatron Collider. Events with six to eight jets are selected by a neural network algorithm and by the requirement that at least one of the jets is tagged as a b quark jet. The measurement is performed with a likelihood fit technique, which simultaneously determines M{sub top} and the jet energy scale (JES) ca… more

Date: December 1, 2011

Creator: Aaltonen, T.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Search for Scalar Top Quark Production in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV

We report on a search for the supersymmetric partner of the top quark (scalar top) decaying into a charm quark and a neutralino in p{bar p} collisions at {radical}s = 1.96 TeV. The data sample, collected by the CDF II detector at the Fermilab Tevatron, corresponds to an integrated luminosity of 2.6 fb{sup -1}. Candidate events are selected by requiring two or more jets and a large imbalance in the transverse momentum. To enhance the analysis sensitivity, at least one of the jets is required to … more

Date: March 1, 2012

Creator: Aaltonen, T.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

BIGFLOW: A numerical code for simulating flow in variably saturated, heterogeneous geologic media. Theory and user`s manaual, Version 1.1

This report documents BIGFLOW 1.1, a numerical code for simulating flow in variably saturated heterogeneous geologic media. It contains the underlying mathematical and numerical models, test problems, benchmarks, and applications of the BIGFLOW code. The BIGFLOW software package is composed of a simulation and an interactive data processing code (DATAFLOW). The simulation code solves linear and nonlinear porous media flow equations based on Darcy`s law, appropriately generalized to account for … more

Date: June 1, 1993

Creator: Ababou, R. & Bagtzoglou, A. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Genome-Wide Identification and 3D Modeling of Proteins involved in DNA Damage Recognition and Repair (Final Report)

DNA Damage Recognition and Repair (DDR&R) proteins play a critical role in cellular responses to low-dose radiation and are associated with cancer. We have performed a systematic, genome-wide computational analysis of genomic data for human genes involved in the DDR&R process. The significant achievements of this project include: 1) Construction of the computational pipeline for searching DDR&R genes, building and validation of 3D models of proteins involved in DDR&R; 2) Functional and structur… more

Date: August 12, 2005

Creator: Abagyan, Ruben & An, Jianghong

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Integrating automatic differentiation with object-oriented toolkits for high-performance scientific computing.

Often the most robust and efficient algorithms for the solution of large-scale problems involving nonlinear PDEs and optimization require the computation of derivative quantities. We examine the use of automatic differentiation (AD) to provide code for computing first and second derivatives in conjunction with two parallel numerical toolkits, the Portable, Extensible Toolkit for Scientific Computing (PETSc) and the Toolkit for Advanced Optimization (TAO). We discuss how the use of mathematical … more

Date: November 1, 2000

Creator: Abate, J.; Benson, S.; Grignon, L.; Hovland, P.; McInnes, L. & Norris, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Algorithms and design for a second-order automatic differentiation module

This article describes approaches to computing second-order derivatives with automatic differentiation (AD) based on the forward mode and the propagation of univariate Taylor series. Performance results are given that show the speedup possible with these techniques relative to existing approaches. The authors also describe a new source transformation AD module for computing second-order derivatives of C and Fortran codes and the underlying infrastructure used to create a language-independent tr… more

Date: July 1, 1997

Creator: Abate, J.; Bischof, C.; Roh, L. & Carle, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Search for gravitational waves associated with the gamma ray burst GRB030329 using the LIGO detectors

We have performed a search for bursts of gravitational waves associated with the very bright Gamma Ray Burst GRB030329, using the two detectors at the LIGO Hanford Observatory. Our search covered the most sensitive frequency range of the LIGO detectors (approximately 80-2048 Hz), and we specifically targeted signals shorter than {approx_equal}150 ms. Our search algorithm looks for excess correlated power between the two interferometers and thus makes minimal assumptions about the gravitational … more

Date: January 1, 2005

Creator: Abbott, B.; Abbott, R.; Adhikari, R.; Ageev, A.; Allen, B.; Amin, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comparison of a constraint directed search to a genetic algorithm in a scheduling application

Scheduling plutonium containers for blending is a time-intensive operation. Several constraints must be taken into account; including the number of containers in a dissolver run, the size of each dissolver run, and the size and target purity of the blended mixture formed from these runs. Two types of algorithms have been used to solve this problem: a constraint directed search and a genetic algorithm. This paper discusses the implementation of these two different approaches to the problem and t… more

Date: April 1, 1993

Creator: Abbott, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigating the point seismic array concept with seismic rotation measurements.

Spatially-distributed arrays of seismometers are often utilized to infer the speed and direction of incident seismic waves. Conventionally, individual seismometers of the array measure one or more orthogonal components of rectilinear particle motion (displacement, velocity, or acceleration). The present work demonstrates that measure of both the particle velocity vector and the particle rotation vector at a single point receiver yields sufficient information to discern the type (compressional o… more

Date: February 1, 2009

Creator: Abbott, Robert E. & Aldridge, David Franklin

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Theoretical Atomic Physics code development IV: LINES, A code for computing atomic line spectra

A new computer program, LINES, has been developed for simulating atomic line emission and absorption spectra using the accurate fine structure energy levels and transition strengths calculated by the (CATS) Cowan Atomic Structure code. Population distributions for the ion stages are obtained in LINES by using the Local Thermodynamic Equilibrium (LTE) model. LINES is also useful for displaying the pertinent atomic data generated by CATS. This report describes the use of LINES. Both CATS and LINE… more

Date: December 1, 1988

Creator: Abdallah, J. Jr. & Clark, R.E.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Interated Intelligent Industrial Process Sensing and Control: Applied to and Demonstrated on Cupola Furnaces

The final goal of this project was the development of a system that is capable of controlling an industrial process effectively through the integration of information obtained through intelligent sensor fusion and intelligent control technologies. The industry of interest in this project was the metal casting industry as represented by cupola iron-melting furnaces. However, the developed technology is of generic type and hence applicable to several other industries. The system was divided into … more

Date: February 12, 2003

Creator: Abdelrahman, Mohamed; Haggard, roger; Mahmoud, Wagdy; Moore, Kevin; Clark, Denis; Larsen, Eric et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department