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Chemical Depth Profiling from Neutron Reflectometry

Description: The material profile of a thin film can be analyzed by placing the film on a substrate and by sending a neutron beam onto it at various angles of incidence. Technically, the scattering length density of the film needs to be determined as a function of depth. A reflectometer is used to measure the amount of reflection (reflectivity) as a function of the angle of incidence. Mathematically, this is equivalent to sending the neutron beam onto the film at every energy but at a fixed angle of inciden… more
Date: March 21, 2006
Creator: Aktosun, Tuncay
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiative effects in scattering of polarized leptons by polarized nucleons and light nuclei

Description: Recent developments in the field of radiative effects in polarized lepton-nuclear scattering are reviewed. The processes of inclusive, semi-inclusive, diffractive and elastic scattering are considered. The explicit formulae obtained within the covariant approach are discussed. FORTRAN codes POLRAD, RADGEN, HAPRAD, DIFFRAD and MASCARAD created on the basis of the formulae are briefly described. Applications for data analysis of the current experiments on lepton-nuclear scattering at CERN, DESY, … more
Date: July 1, 2001
Creator: Akushevich, Igor; Ilyichev, A. & Shumeiko, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Automatic Differentiation of Codes in Nuclear Engineering Applications.

Description: We discuss our experience in applying automatic differentiation (AD) to calculations in nuclear reactor applications. The document is intended as a guideline on how to apply AD to Fortran codes with significant legacy components; it is also a part of a larger research effort in uncertainty quantification using sampling methods augmented with derivative information. We provide a brief theoretical description of the concept of AD, explain the necessary changes in the code structure, and remark on… more
Date: December 1, 2009
Creator: Alexe, M.; Roderick, O.; Utke, J.; Anitescu, M.; Hovland, P.; Fanning, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Standard format for Les Houches event files

Description: A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a minimal XML-style structure, for clarity and to simplify parsing.
Date: September 1, 2006
Creator: Alwall, J.; Ballestrero, A.; Bartalini, P.; Belov, S.; Boos, E.; Buckley, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ZFITTER: A Semi-analytical program for fermion pair production in e+ e- annihilation, from version 6.21 to version 6.42

Description: ZFITTER is a Fortran program for the calculation of fermion pair production and radiative corrections at high energy e{sup +}e{sup -} colliders; it is also suitable for other applications where electroweak radiative corrections appear. ZFITTER is based on a semi-analytical approach to the calculation of radiative corrections in the Standard Model. They present a summary of new features of the ZFITTER program version 6.42 compared to version 6.21. The most important additions are: (1) some highe… more
Date: July 1, 2005
Creator: Arbuzov, A. B.; Awramik, M.; Czakon, M.; Freitas, A.; Grunewald, M. W.; Monig, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary Structural Design of Composite Blades for Two- and Three-Blade Rotors

Description: A computerized method has been developed to aid in the preliminary design of composite wind turbine blades. The method allows for arbitrary specification of the chord, twist, and airfoil geometry along the blade and an arbitrary number of shear webs. Given the blade external geometry description and its design load distribution, the Fortran code uses ultimate-strength and buckling-resistance criteria to compute the design thickness of load-bearing composite laminates. The code also includes an … more
Date: September 1, 2004
Creator: Bir, G. & Migliore, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On combining computational differentiation and toolkits for parallel scientific computing.

Description: Automatic differentiation is a powerful technique for evaluating derivatives of functions given in the form of a high-level programming language such as Fortran, C, or C++. The program is treated as a potentially very long sequence of elementary statements to which the chain rule of differential calculus is applied over and over again. Combining automatic differentiation and the organizational structure of toolkits for parallel scientific computing provides a mechanism for evaluating derivative… more
Date: June 8, 2000
Creator: Bischof, C. H.; Buecker, H. M. & Hovland, P. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Tranft User's Manual.

Description: The Fortran program TRANFT simulates transverse instabilities in circular accelerators using fast Fourier transform algorithms. It may be used for any particle type. Forces from transverse wakefields, longitudinal wakefields, and transverse detuning wakes are included, with linear transverse space charge forces included as a special case. This note describes the algorithms and their implementation in TRANFT.
Date: August 30, 2006
Creator: Blaskiewicz, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Component Technology for Laser Plasma Simulation

Description: This paper will discuss the application of high performance component software technology developed for a complex physics simulation development effort. The primary tool used to build software components is called Babel and is used to create language-independent libraries for high performance computers. Components were constructed from legacy code and wrapped with a thin Python layer to enable run-time scripting. Low-level components in Fortran, C++, and Python were composed directly as Babel c… more
Date: June 17, 2002
Creator: Bosl, W. J.; Smith, S. G.; Dahlgren, T.; Epperley, T.; Kohn, S. & Kumfert, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geographical Distribution of Biomass Carbon in Tropical Southeast Asian Forests: A Database

Description: A database was generated of estimates of geographically referenced carbon densities of forest vegetation in tropical Southeast Asia for 1980. A geographic information system (GIS) was used to incorporate spatial databases of climatic, edaphic, and geomorphological indices and vegetation to estimate potential (i.e., in the absence of human intervention and natural disturbance) carbon densities of forests. The resulting map was then modified to estimate actual 1980 carbon density as a function of… more
Date: May 22, 2001
Creator: Brown, S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimization of Aperiodic Waveguide Mode Converters

Description: Previous studies by Haq, Webb and others have demonstrated the design of aperiodic waveguide structures to act as filters and mode converters. These aperiodic structures have been shown to yield high efficiency mode conversion or filtering in lengths considerably shorter than structures using gradual transitions and periodic perturbations. The design method developed by Haq and others has used mode-matching models for the irregular, stepped waveguides coupled with computer optimization to achie… more
Date: December 9, 2004
Creator: Burke, G. J.; White, D. A. & Thompson, C. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Adaptive mesh refinement in titanium

Description: In this paper, we evaluate Titanium's usability as a high-level parallel programming language through a case study, where we implement a subset of Chombo's functionality in Titanium. Chombo is a software package applying the Adaptive Mesh Refinement methodology to numerical Partial Differential Equations at the production level. In Chombo, the library approach is used to parallel programming (C++ and Fortran, with MPI), whereas Titanium is a Java dialect designed for high-performance scientific… more
Date: January 21, 2005
Creator: Colella, Phillip & Wen, Tong
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

GAiN: Distributed Array Computation with Python

Description: Scientific computing makes use of very large, multidimensional numerical arrays - typically, gigabytes to terabytes in size - much larger than can fit on even the largest single compute node. Such arrays must be distributed across a "cluster" of nodes. Global Arrays is a cluster-based software system from Battelle Pacific Northwest National Laboratory that enables an efficient, portable, and parallel shared-memory programming interface to manipulate these arrays. Written in and for the C and FO… more
Date: April 24, 2009
Creator: Daily, Jeffrey A.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

An evaluation of Java's I/O capabilities for high-performance computing.

Description: Java is quickly becoming the preferred language for writing distributed applications because of its inherent support for programming on distributed platforms. In particular, Java provides compile-time and run-time security, automatic garbage collection, inherent support for multithreading, support for persistent objects and object migration, and portability. Given these significant advantages of Java, there is a growing interest in using Java for high-performance computing applications. To be s… more
Date: November 10, 2000
Creator: Dickens, P. M. & Thakur, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design and implementation of a parallel array operator for the arbitrary remapping of data.

Description: The data redistribution or remapping functions, gather and scatter, are of long-standing in high-performance computing, having been included in Cray Fortran for decades. In this paper, we present a highly-general array operator with powerful ga.ther and scatter capa.bilities unmatched in other array languages. We discuss an efficient parallel implementation, introducing several new optimizations-run length encoding, dead army reuse, and direct conimunica.tion-that lessen the costs associa.ted w… more
Date: January 1, 2003
Creator: Dietz, Steven; Choi, S. E. (Sung-Eun); Chamberlain, B. L. (Bradford L.) & Snyder, Lawrence
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

MPPL Reference Manual

Description: MPPL (''More Productive Programming Language'') allows programmers to write in a language that is more convenient and powerful than Fortran 77. MPPL then transforms statements written in the MPPL language into standard Fortran 77. This language is essentially an extension to Fortran 77 that provides free-form input and many structured constructs such as ''while'' and ''for'' loops. MPPL's macro pre-processor and file-inclusion facility encourage the creation of structured, easy-to-read programs… more
Date: July 1, 2002
Creator: Dubois, P. F.; Motteler, Z. C.; Willmann, P. A.; Allsman, R. A.; Benedetti, C. M.; Crotinger, J. A. et al.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Preliminary Thoughts on Introducing Structs to SIDL/Babel: White Paper

Description: In the past 6 months, there has been increased interest in adding something analogous to C structs to the SIDL language and the Babel language interoperability tool [2, 6]. In particular, Rob Armstrong, of the Common Component Architecture [4], said the lack of structs ''is an oft-cited reason that people can't use Babel.'' Because the interest is high and lack of structs is a barrier to Babel adoption, we must carefully consider the current work around, the motivations for structs, the implica… more
Date: January 8, 2004
Creator: Epperly, T W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Railplug Ignition System for Enhanced Engine Performance and Reduced Maintenance: Final Technical Report

Description: This Final Technical Report discusses the progress that was made on the experimental and numerical tasks over the duration of this project. The primary objectives of the project were to (1) develop an improved understanding of the spark ignition process, and (2) develop the railplug as an improved ignitor for large bore stationary natural gas engines. We performed fundamental experiments on the physical processes occurring during spark ignition and used the results from these experiments to aid… more
Date: August 2005
Creator: Ezekoye, D. K.; Hall, Matt & Matthews, Ron
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ITS Version 6 : the integrated TIGER series of coupled electron/photon Monte Carlo transport codes.

Description: ITS is a powerful and user-friendly software package permitting state-of-the-art Monte Carlo solution of lineartime-independent coupled electron/photon radiation transport problems, with or without the presence of macroscopic electric and magnetic fields of arbitrary spatial dependence. Our goal has been to simultaneously maximize operational simplicity and physical accuracy. Through a set of preprocessor directives, the user selects one of the many ITS codes. The ease with which the makefile s… more
Date: April 1, 2008
Creator: Franke, Brian Claude; Kensek, Ronald Patrick & Laub, Thomas William
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CFEST Coupled Flow, Energy & Solute Transport Version CFEST005 User’s Guide

Description: The CFEST (Coupled Flow, Energy, and Solute Transport) simulator described in this User’s Guide is a three-dimensional finite-element model used to evaluate groundwater flow and solute mass transport. Confined and unconfined aquifer systems, as well as constant and variable density fluid flows can be represented with CFEST. For unconfined aquifers, the model uses a moving boundary for the water table, deforming the numerical mesh so that the uppermost nodes are always at the water table. For so… more
Date: July 20, 2006
Creator: Freedman, Vicky L.; Chen, Yousu; Gilca, Alex; Cole, Charles R. & Gupta, Sumant K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Parallel performance of the XL Fortran random{_}number intrinsic function on Seaborg

Description: The Fortran intrinsic function random{_}number is shown to perform very poorly when simultaneously called from 16 tasks per node on NERSC's IBM SP Seaborg in its default runtime configuration. Setting the runtime option intrinthds=16 improves runtime performance significantly and gives good results for all possible numbers of tasks per node. It is speculated that the cause of the problem is the creation of an excessive number of threads in the default configuration. It is noted that these threa… more
Date: July 30, 2003
Creator: Gerber, Richard A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

AUTOMATIC DIFFERENTIATION OF AN EULERIAN HYDROCODE

Description: Automatic differentiation (AD) is applied to a two-dimensional Eulerian hydrodynamics computer code (hydrocode) to provide gradients that will be used for design optimization and uncertainty analysis. We examine AD in both the forward and adjoint (reverse) mode using Automatic Differentiation of Fortran (ADIFOR, version 3.0). Setup time, accuracy, and run times are described for three problems. The test set consists of a one-dimensional shock-propagation problem, a two-dimensional metal-jet-for… more
Date: November 1, 2000
Creator: HENNINGER, R.; CARLE, A. & MAUDLIN, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

AnalyzeHOLE: An Integrated Wellbore Flow Analysis Tool

Description: Conventional interpretation of flow logs assumes that hydraulic conductivity is directly proportional to flow change with depth. However, well construction can significantly alter the expected relation between changes in fluid velocity and hydraulic conductivity. Strong hydraulic conductivity contrasts between lithologic intervals can be masked in continuously screened wells. Alternating intervals of screen and blank casing also can greatly complicate the relation between flow and hydraulic pro… more
Date: October 1, 2009
Creator: Halford, Keith J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Walker Branch Throughfall Displacement Experiment Data Report: Site Characterization, System Performance, Weather, Species Composition, and Growth

Description: This numeric data package provides data sets, and accompanying documentation, on site characterization, system performance, weather, species composition, and growth for the Throughfall Displacement Experiment, which was established in the Walker Branch Watershed of East Tennessee to provide data on the responses of forests to altered precipitation regimes. The specific data sets include soil water content and potential, coarse fraction of the soil profile, litter layer temperature, soil tempera… more
Date: September 4, 2001
Creator: Hanson, Paul J.; Todd, Donald E.; Riggs, Jeffery S.; Wolfe, Mark E. & O'Neill, Elizabeth G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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