Numerical methods of integration applied in the nonlinear dynamic analysis of shells of revolution
Tillerson, Joe Richard
1970-01-01T23:59:59.000Z
" exter!inl loads to generate the right-hanii sii!e of th squat!o is of mction (gq. 4) . CaLculatioo. of the pseudo g&. nerali. ed forces . is discussed in more detail in Ref. 14. Displacement Functions In ori!er to apply the matrix displacement... the solution becomes uns table. I'ourth ? Order !a!n e-KutLa Pore ulas The equations of motion (gq. 16'1 can be solved at any po in!. in time Lo obtain the nodal acce1e rations. For Lhe spe: ialized set of equations derived for ih's shell analysis (te...
Meyer, Arne [University of Hamburg, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg (Germany); Dierks, Karsten [University of Hamburg, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg (Germany); XtalConcepts, Marlowring 19, 22525 Hamburg (Germany); Hussein, Rana [University of Hamburg, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg (Germany); Brillet, Karl [ESBS, Pôle API, 300 Boulevard Sébastien Brant, CS10413, 67412 Illkirch CEDEX (France); Brognaro, Hevila [Săo Paulo State University, UNESP/IBILCE, Caixa Postal 136, Săo José do Rio Preto-SP, 15054 (Brazil); Betzel, Christian, E-mail: christian.betzel@uni-hamburg.de [University of Hamburg, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg (Germany)
2015-01-01T23:59:59.000Z
Application of in situ dynamic light scattering to solutions of protein–detergent complexes permits characterization of these complexes in samples as small as 2 µl in volume. Detergents are widely used for the isolation and solubilization of membrane proteins to support crystallization and structure determination. Detergents are amphiphilic molecules that form micelles once the characteristic critical micelle concentration (CMC) is achieved and can solubilize membrane proteins by the formation of micelles around them. The results are presented of a study of micelle formation observed by in situ dynamic light-scattering (DLS) analyses performed on selected detergent solutions using a newly designed advanced hardware device. DLS was initially applied in situ to detergent samples with a total volume of approximately 2 µl. When measured with DLS, pure detergents show a monodisperse radial distribution in water at concentrations exceeding the CMC. A series of all-transn-alkyl-?-d-maltopyranosides, from n-hexyl to n-tetradecyl, were used in the investigations. The results obtained verify that the application of DLS in situ is capable of distinguishing differences in the hydrodynamic radii of micelles formed by detergents differing in length by only a single CH{sub 2} group in their aliphatic tails. Subsequently, DLS was applied to investigate the distribution of hydrodynamic radii of membrane proteins and selected water-insoluble proteins in presence of detergent micelles. The results confirm that stable protein–detergent complexes were prepared for (i) bacteriorhodopsin and (ii) FetA in complex with a ligand as examples of transmembrane proteins. A fusion of maltose-binding protein and the Duck hepatitis B virus X protein was added to this investigation as an example of a non-membrane-associated protein with low water solubility. The increased solubility of this protein in the presence of detergent could be monitored, as well as the progress of proteolytic cleavage to separate the fusion partners. This study demonstrates the potential of in situ DLS to optimize solutions of protein–detergent complexes for crystallization applications.
Advanced Multivariate Analysis Tools Applied to Surface Analysis...
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Advanced Multivariate Analysis Tools Applied to Surface Analysis. Citation Details In-Document Search Title: Advanced Multivariate Analysis Tools Applied to Surface Analysis. No...
Applying uncertainty quantification to multiphase flow computational fluid dynamics
Gel, A.; Garg, R.; Tong, C.; Shahnam, M.; Guenther, C.
2013-07-01T23:59:59.000Z
Multiphase computational fluid dynamics plays a major role in design and optimization of fossil fuel based reactors. There is a growing interest in accounting for the influence of uncertainties associated with physical systems to increase the reliability of computational simulation based engineering analysis. The U.S. Department of Energy's National Energy Technology Laboratory (NETL) has recently undertaken an initiative to characterize uncertainties associated with computer simulation of reacting multiphase flows encountered in energy producing systems such as a coal gasifier. The current work presents the preliminary results in applying non-intrusive parametric uncertainty quantification and propagation techniques with NETL's open-source multiphase computational fluid dynamics software MFIX. For this purpose an open-source uncertainty quantification toolkit, PSUADE developed at the Lawrence Livermore National Laboratory (LLNL) has been interfaced with MFIX software. In this study, the sources of uncertainty associated with numerical approximation and model form have been neglected, and only the model input parametric uncertainty with forward propagation has been investigated by constructing a surrogate model based on data-fitted response surface for a multiphase flow demonstration problem. Monte Carlo simulation was employed for forward propagation of the aleatory type input uncertainties. Several insights gained based on the outcome of these simulations are presented such as how inadequate characterization of uncertainties can affect the reliability of the prediction results. Also a global sensitivity study using Sobol' indices was performed to better understand the contribution of input parameters to the variability observed in response variable.
A study of the point reactor dynamics equations as applied to large nuclear excursions
Perry, Robert Terrell
1967-01-01T23:59:59.000Z
- neutronic code" which may be used for reactor excursion analysis. Nicholson [2] has presented methods for determining the energy release in hypothetical fast-reactor meltdown accidents while Allred and Carter I 3) have discussed the dynamics...A STUDY OF THE POINT REACTOR DYNAMICS EQUATIONS AS APPLIED TO LARGE NUCLEAR EXCURSIONS A Thesis By ROBERT TERRELL PERRY, JR, Submitted to the Graduate College of the Texas ARM University xn partial fulfillment of the requirements i...
Fourier Analysis and Autocorrelation Function Applied to Periodical Nanostructures
Rockett, Angus
Fourier Analysis and Autocorrelation Function Applied to Periodical Nanostructures E. Cruz Microscopy (AFM) Image Fast Fourier Transformation Autocorrelation Function(AC) Angular Distribution] Fourier Analysis: analytical and geometrical aspects, Bray William O ed. New York: Marcel Dekker, 1994
Partial fringe analysis applied to holographic interferometry
Rathbun, Paul Alan
1990-01-01T23:59:59.000Z
camera, (with thermoplastic plates), and piezoelectric positioners for imposing displacements was assembled. Fiber optics were used to guide the beams. Double exposure holograms were made for cases of a. cantilevered beam and a plate with clamped...? clamped free ? free boundary conditions with diB'erent applied displacements. 1hese holograms were analyzed using a, high resolution digital image processing system as well as specially written programs for determining out ? of ? plane displacements...
Neutron activation analysis applied to perspiration electrolytes
McAndrew, Robert Gavin
1969-01-01T23:59:59.000Z
. In the choice of the polyethylene sheeting used, nine commercial polyethylene sheets or bags were analyzed for their sodium content by neutron activation analysis. A small sax:. .pie of each material was weighed and then irradiated in the reactor for one... 3. 46 3. 76 4. 2 1. 15 1. 16 . 59 1. 19 1. 82 1. 89 1. 50 . 54 1. 88 . 74 1. 20 1. 29 43 which were irradiated unshielded by cadmium in the center tube of the reactor where the fast neutron flux was much greater than at the reactor...
Rucklidge, Alastair
. Numerical simulations have been carried out, computing the average uptake after a sufficient number of timeSIAM J. APPLIED DYNAMICAL SYSTEMS c xxxx Society for Industrial and Applied Mathematics Vol. xx, pp explains the results of the numerical calculations. Key words. Innovation diffusion, networks, threshold
Numerical tools applied to power reactor noise analysis Christophe Demazie`re*, Imre Pazsit
Pázsit, Imre
Review Numerical tools applied to power reactor noise analysis Christophe Demazie`re*, Imre Pa´zsit Chalmers University of Technology, Department of Nuclear Engineering, SE-412 96 Go¨teborg, Sweden Abstract systems in two-group theory, a code was developed for the calculation of the Green's function (dynamic
DYNAMIC INVARIANTS IN PROTEIN FOLDING PATHWAYS REVEALED BY TENSOR ANALYSIS
Langmead, Christopher James
DYNAMIC INVARIANTS IN PROTEIN FOLDING PATHWAYS REVEALED BY TENSOR ANALYSIS Arvind Ramanathan Lane a spatio-temporal analysis of protein folding pathways. We applied our method to folding simulations of how a protein folds into its functionally relevant conformations. Protein folding pathways span over
Applied zooarchaeology: the relevance of faunal analysis to
Wolverton, Steve
rcalrn of modern wildlife management by applying the knowledge it gains from its unique perspcctivcApplied zooarchaeology: the relevance of faunal analysis to wildlife management R. bee Lagman to define the boundaries of biological preserves meant to prescr~~cbiota in perpetuity are all subjects
Grid embedment as applied to viscous transonic airfoil flowfield analysis
Reed, Christopher L.
1981-01-01T23:59:59.000Z
GRID EMBEDMENT AS APPLIED TO VISCOUS TRANSONIC AIRFOIL FLOWFIELD ANALYSIS A Thesis by CHRISTOPHER L. REED Submitted to the Graduate College of Texas ARM Uni ver si ty in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1981 Major Subject: Aerospace Engineering GRID EMBEDMENT AS APPLIED TO VISCOUS TRANSONIC AIRFOIL FLOWFIELD ANALYSIS A Thesis by CHRISTOPHER L, REED Approved as to style and content by: airma o o ittee (Member) ember Head...
Composition of Dynamic Analysis Aspects Eric Tanter
Binder, Walter
Composition of Dynamic Analysis Aspects ´Eric Tanter PLEIAD Laboratory Computer Science Department thanks to recent advances in exhaustive weaving in core libraries. Casting dynamic analyses as aspects, simultaneously. However, even if dynamic analysis as- pects are mutually independent, their mere presence
Dynamical analysis of highly excited molecular spectra
Kellman, M.E. [Univ. of Oregon, Eugene (United States)
1993-12-01T23:59:59.000Z
The goal of this program is new methods for analysis of spectra and dynamics of highly excited vibrational states of molecules. In these systems, strong mode coupling and anharmonicity give rise to complicated classical dynamics, and make the simple normal modes analysis unsatisfactory. New methods of spectral analysis, pattern recognition, and assignment are sought using techniques of nonlinear dynamics including bifurcation theory, phase space classification, and quantization of phase space structures. The emphasis is chaotic systems and systems with many degrees of freedom.
Multivariate Mathematical Morphology applied to Color Image Analysis
LefĂ¨vre, SĂ©bastien
Chapter 10 Multivariate Mathematical Morphology applied to Color Image Analysis 10.1. Introduction multivariate morphological operators, none of them has yet been widely accepted. Chapter written by E. APTOULA and S. LEFĂ?VRE. 303 #12;304 Multivariate Image Processing The lexicographical ordering is certainly
Dynamical Analysis of a Networked Control System
Guofeng Zhang; Guanrong Chen; Tongwen Chen; Maria D'Amico
2014-05-18T23:59:59.000Z
A new network data transmission strategy was proposed in Zhang \\& Chen [2005] (arXiv:1405.2404), where the resulting nonlinear system was analyzed and the effectiveness of the transmission strategy was demonstrated via simulations. In this paper, we further generalize the results of Zhang \\& Chen [2005] in the following ways: 1) Construct first-return maps of the nonlinear systems formulated in Zhang \\& Chen [2005] and derive several existence conditions of periodic orbits and study their properties. 2) Formulate the new system as a hybrid system, which will ease the succeeding analysis. 3) Prove that this type of hybrid systems is not structurally stable based on phase transition which can be applied to higher-dimensional cases effortlessly. 4) Simulate a higher-dimensional model with emphasis on their rich dynamics. 5) Study a class of continuous-time hybrid systems as the counterparts of the discrete-time systems discussed above. 6) Propose new controller design methods based on this network data transmission strategy to improve the performance of each individual system and the whole network. We hope that this research and the problems posed here will rouse interests of researchers in such fields as control, dynamical systems and numerical analysis.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Apply Application Process Bringing together top, space science students with internationally recognized researchers at Los Alamos in an educational and collaborative atmosphere....
A STUDY OF COMPUTATIONAL FLUID DYNAMICS APPLIED TO ROOM AIR FLOW
for supplying me a copy of his three-dimensional, laminar, constant density fluid flow computer program, whichi A STUDY OF COMPUTATIONAL FLUID DYNAMICS APPLIED TO ROOM AIR FLOW By JAMES W. WEATHERS Bachelor of the requirements for the Degree of MASTER OF SCIENCE May, 1992 #12;ii A STUDY OF COMPUTATIONAL FLUID DYNAMICS
Soatto, Stefano
of extremely low pressure rarefied gas flows is important in a wide range of applications, from the reentrySIAM J. on Applied Mathematics, submitted 20 February 1996 The Gaussian Moment Closure for Gas of Levermore applied to the Boltzmann equation for rarefied gas dynamics leads to a hierarchy of symmetric
Comparative molecular dynamics analysis of tapasin-dependent...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
molecular dynamics analysis of tapasin-dependent and -independent MHC class I alleles. Comparative molecular dynamics analysis of tapasin-dependent and -independent MHC class I...
May, J. Peter
APPLICATIONS OF FOURIER ANALYSIS TO NON-ANALYTIC FIELDS KEVIN QIAN Abstract. Fourier analysis, a classical topic in analysis, can be applied to many nonanalytic fields. This paper explores Fourier analysis in multiple do- mains in order to prove several nonanalytic results. Fourier analysis will be explored
Feasibility Studies of Applying Kalman Filter Techniques to Power System Dynamic State Estimation
Huang, Zhenyu; Schneider, Kevin P.; Nieplocha, Jarek
2007-08-01T23:59:59.000Z
Abstract—Lack of dynamic information in power system operations mainly attributes to the static modeling of traditional state estimation, as state estimation is the basis driving many other operations functions. This paper investigates the feasibility of applying Kalman filter techniques to enable the inclusion of dynamic modeling in the state estimation process and the estimation of power system dynamic states. The proposed Kalman-filter-based dynamic state estimation is tested on a multi-machine system with both large and small disturbances. Sensitivity studies of the dynamic state estimation performance with respect to measurement characteristics – sampling rate and noise level – are presented as well. The study results show that there is a promising path forward to implementation the Kalman-filter-based dynamic state estimation with the emerging phasor measurement technologies.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm BiofuelinAnalysis ofAntonyaFederal(SC)FBerkeley
Semiclassical analysis of quantum dynamics
Siyang Yang
2011-11-15T23:59:59.000Z
Simulating the molecular dynamics (MD) using classical or semi-classical trajectories provides important details for the understanding of many chemical reactions, protein folding, drug design, and solvation effects. MD simulations using trajectories have achieved great successes in the computer simulations of various systems, but it is difficult to incorporate quantum effects in a robust way. Therefore, improving quantum wavepacket dynamics and incorporating nonadiabatic transitions and quantum effects into classical and semi-classical molecular dynamics is critical as well as challenging. In this paper, we present a MD scheme in which a new set of equations of motion (EOM) are proposed to effectively propagate nuclear trajectories while conserving quantum mechanical energy which is critical for describing quantum effects like tunneling. The new quantum EOM is tested on a one-state one-dimensional and a two-state two-dimensional model nonadiabatic systems. The global quantum force experienced by each trajectory promotes energy redistribution among the bundle of trajectories, and thus helps the individual trajectory tunnel through the potential barrier higher than the energy of the trajectory itself. Construction of the new quantum force and EOM also provides a better way to treat the issue of back-reaction in mixed quantum-classical (MQC) methods, i.e. self-consistency between quantum degrees of freedom (DOF) and classical DOF.
A Hygrothermal Risk Analysis Applied to Residential Unvented Attics
Pallin, Simon B [ORNL] [ORNL; Kehrer, Manfred [ORNL] [ORNL
2013-01-01T23:59:59.000Z
Aresidential building, constructed with an unvented attic, is acommonroof assembly in the United States.The expected hygrothermal performance and service life of the roof are difficult to estimate due to a number of varying parameters.Typical parameters expected to vary are the climate, direction, and slope of the roof as well as the radiation properties of the surface material. Furthermore, influential parameters are indoor moisture excess, air leakages through the attic floor, and leakages from air-handling unit and ventilation ducts. In addition, the type of building materials such as the insulation material and closed or open cell spray polyurethane foam will influence the future performance of the roof. A development of a simulation model of the roof assembly will enable a risk and sensitivity analysis, in which the most important varying parameters on the hygrothermal performance can be determined. The model is designed to perform probabilistic simulations using mathematical and hygrothermal calculation tools. The varying input parameters can be chosen from existing measurements, simulations, or standards. An analysis is applied to determine the risk of consequences, such as mold growth, rot, or energy demand of the HVAC unit. Furthermore, the future performance of the roof can be simulated in different climates to facilitate the design of an efficient and reliable roof construction with the most suitable technical solution and to determine the most appropriate building materials for a given climate
Linear Stability Analysis of Dynamical Quadratic Gravity
Dimitry Ayzenberg; Kent Yagi; Nicolas Yunes
2014-03-18T23:59:59.000Z
We perform a linear stability analysis of dynamical, quadratic gravity in the high-frequency, geometric optics approximation. This analysis is based on a study of gravitational and scalar modes propagating on spherically-symmetric and axially-symmetric, vacuum solutions of the theory. We find dispersion relations that do no lead to exponential growth of the propagating modes, suggesting the theory is linearly stable on these backgrounds. The modes are found to propagate at subluminal and superluminal speeds, depending on the propagating modes' direction relative to the background geometry, just as in dynamical Chern-Simons gravity.
A Case Study of Chemical Organization Theory Applied to Virus Dynamics
Dittrich, Peter
A Case Study of Chemical Organization Theory Applied to Virus Dynamics Naoki Matsumaru1 , Pietro, Venezia, Italia * corresponding author Abstract. Chemical organization theory has been proposed to provide and Horn [10]. Here, we introduce chemical organization theory [11, 12] as another method to analyse
Dynamic Event Tree Analysis Through RAVEN
A. Alfonsi; C. Rabiti; D. Mandelli; J. Cogliati; R. A. Kinoshita; A. Naviglio
2013-09-01T23:59:59.000Z
Conventional Event-Tree (ET) based methodologies are extensively used as tools to perform reliability and safety assessment of complex and critical engineering systems. One of the disadvantages of these methods is that timing/sequencing of events and system dynamics is not explicitly accounted for in the analysis. In order to overcome these limitations several techniques, also know as Dynamic Probabilistic Risk Assessment (D-PRA), have been developed. Monte-Carlo (MC) and Dynamic Event Tree (DET) are two of the most widely used D-PRA methodologies to perform safety assessment of Nuclear Power Plants (NPP). In the past two years, the Idaho National Laboratory (INL) has developed its own tool to perform Dynamic PRA: RAVEN (Reactor Analysis and Virtual control ENvironment). RAVEN has been designed in a high modular and pluggable way in order to enable easy integration of different programming languages (i.e., C++, Python) and coupling with other application including the ones based on the MOOSE framework, developed by INL as well. RAVEN performs two main tasks: 1) control logic driver for the new Thermo-Hydraulic code RELAP-7 and 2) post-processing tool. In the first task, RAVEN acts as a deterministic controller in which the set of control logic laws (user defined) monitors the RELAP-7 simulation and controls the activation of specific systems. Moreover, RAVEN also models stochastic events, such as components failures, and performs uncertainty quantification. Such stochastic modeling is employed by using both MC and DET algorithms. In the second task, RAVEN processes the large amount of data generated by RELAP-7 using data-mining based algorithms. This paper focuses on the first task and shows how it is possible to perform the analysis of dynamic stochastic systems using the newly developed RAVEN DET capability. As an example, the Dynamic PRA analysis, using Dynamic Event Tree, of a simplified pressurized water reactor for a Station Black-Out scenario is presented.
Dynamic Analysis of Fuel Cycle Transitioning
Brent Dixon; Steve Piet; David Shropshire; Gretchen Matthern
2009-09-01T23:59:59.000Z
This paper examines the time-dependent dynamics of transitioning from a once-through fuel cycle to a closed fuel cycle. The once-through system involves only Light Water Reactors (LWRs) operating on uranium oxide fuel UOX), while the closed cycle includes both LWRs and fast spectrum reactors (FRs) in either a single-tier system or two-tier fuel system. The single-tier system includes full transuranic recycle in FRs while the two-tier system adds one pass of mixed oxide uranium-plutonium (MOX U-Pu) fuel in the LWR. While the analysis primarily focuses on burner fast reactors, transuranic conversion ratios up to 1.0 are assessed and many of the findings apply to any fuel cycle transitioning from a thermal once-through system to a synergistic thermal-fast recycle system. These findings include uranium requirements for a range of nuclear electricity growth rates, the importance of back end fuel cycle facility timing and magnitude, the impact of employing a range of fast reactor conversion ratios, system sensitivity to used fuel cooling time prior to recycle, impacts on a range of waste management indicators, and projected electricity cost ranges for once-through, single-tier and two-tier systems. The study confirmed that significant waste management benefits can be realized as soon as recycling is initiated, but natural uranium savings are minimal in this century. The use of MOX in LWRs decouples the development of recycle facilities from fast reactor fielding, but also significantly delays and limits fast reactor deployment. In all cases, fast reactor deployment was significantly below than predicted by static equilibrium analyses.
Toward a computer-applied dynamic dwelling design model : multi-family walk-up apartments in Taiwan
Chou, Wern-Bin
1985-01-01T23:59:59.000Z
It is the objectives of this study to explore the feasibility of applying a computer in a dynamic dwelling design . Here, the computer is applied to evaluate a support design by testing possible layout variations. A specific ...
Formal analysis of design process dynamics TIBOR BOSSE,1
Bosse, Tibor
Formal analysis of design process dynamics TIBOR BOSSE,1 CATHOLIJN M. JONKER,2 AND JAN TREUR1 1, 2009) Abstract This paper presents a formal analysis of design process dynamics. Such a formal analysis of design processes. The analysis was geared toward the identification of dynamic design properties
To Apply or Not to Apply: A Survey Analysis of Grant Writing Costs and Benefits
von Hippel, Ted
2015-01-01T23:59:59.000Z
We surveyed 113 astronomers and 82 psychologists active in applying for federally funded research on their grant-writing history between January, 2009 and November, 2012. We collected demographic data, effort levels, success rates, and perceived non-financial benefits from writing grant proposals. We find that the average proposal takes 116 PI hours and 55 CI hours to write; although time spent writing was not related to whether the grant was funded. Effort did translate into success, however, as academics who wrote more grants received more funding. Participants indicated modest non-monetary benefits from grant writing, with psychologists reporting a somewhat greater benefit overall than astronomers. These perceptions of non-financial benefits were unrelated to how many grants investigators applied for, the number of grants they received, or the amount of time they devoted to writing their proposals. We also explored the number of years an investigator can afford to apply unsuccessfully for research grants a...
Dynamical analysis of generalized Galileon cosmology
Leon, Genly [Departamento de Matemática, Universidad Central de Las Villas, Santa Clara, CP 54830 (Cuba); Saridakis, Emmanuel N., E-mail: genly.leon@ucv.cl, E-mail: Emmanuel_Saridakis@baylor.edu [Physics Division, National Technical University of Athens, 15780 Zografou Campus, Athens (Greece)
2013-03-01T23:59:59.000Z
We perform a detailed dynamical analysis of generalized Galileon cosmology, incorporating also the requirements of ghost and instabilities absence. We find that there are not any new stable late-time solutions apart from those of standard quintessence. Furthermore, depending on the model parameters the Galileons may survive at late times or they may completely disappear by the dynamics, however the corresponding observables are always independent of the Galileon terms, determined only by the usual action terms. Thus, although the Galileons can play an important role at inflationary or at recent times, in the future, when the universe will asymptotically reach its stable state, they will not have any effect on its evolution.
Structural Equation Modelling for Causal Analysis Applied to Transport Systems
Schlingloff, Holger
barrier (SBA), fault tree (FTA) and failure mode and effect analysis (FMEA) into one method. Our approach Analysis (FTA), Failure Mode and Effect Analysis (FMEA), Event Tree Analysis (ETA) or Safety Barrier]). The probably most familiar methods FTA and FMEA are widely used in industry due to their intuitive
Digital Dynamic Range Compressor Design--A Tutorial and Analysis
Reiss, Josh
PAPERS Digital Dynamic Range Compressor Design-- A Tutorial and Analysis DIMITRIOS GIANNOULIS formal knowledge and analysis of compressor design techniques. In this tutorial we describe several different approaches to digital dynamic range compressor design. Digital implementations of several classic
Static and dynamic analysis: synergy and duality Michael D. Ernst
Ernst, Michael
Static and dynamic analysis: synergy and duality Michael D. Ernst MIT Lab for Computer Science static and dynamic analysis. The first concerns synergies between static and dynamic analysis. Wherever analyses should inspire different apÂ proaches to the same problem. Furthermore, existing static
Static and dynamic analysis: synergy and duality Michael D. Ernst
Ernst, Michael
Static and dynamic analysis: synergy and duality Michael D. Ernst MIT Lab for Computer Science static and dynamic analysis. The first concerns synergies between static and dynamic analysis. Wherever analyses should inspire different ap- proaches to the same problem. Furthermore, existing static
Dynamical Systems and Applications of Nonlinear Functional Analysis to Dynamical Systems
Zhang, Meirong
Dynamical Systems and Applications of Nonlinear Functional Analysis to Dynamical Systems Meirong on applications of nonlinear functional analysis to dynamical systems are briefly reviewed. Special emphasis consists of three parts. In Part 1 we introduce some basic concepts in dynamical systems, including limit
Measurement uncertainty analysis techniques applied to PV performance measurements
Wells, C.
1992-10-01T23:59:59.000Z
The purpose of this presentation is to provide a brief introduction to measurement uncertainty analysis, outline how it is done, and illustrate uncertainty analysis with examples drawn from the PV field, with particular emphasis toward its use in PV performance measurements. The uncertainty information we know and state concerning a PV performance measurement or a module test result determines, to a significant extent, the value and quality of that result. What is measurement uncertainty analysis It is an outgrowth of what has commonly been called error analysis. But uncertainty analysis, a more recent development, gives greater insight into measurement processes and tests, experiments, or calibration results. Uncertainty analysis gives us an estimate of the I interval about a measured value or an experiment's final result within which we believe the true value of that quantity will lie. Why should we take the time to perform an uncertainty analysis A rigorous measurement uncertainty analysis: Increases the credibility and value of research results; allows comparisons of results from different labs; helps improve experiment design and identifies where changes are needed to achieve stated objectives (through use of the pre-test analysis); plays a significant role in validating measurements and experimental results, and in demonstrating (through the post-test analysis) that valid data have been acquired; reduces the risk of making erroneous decisions; demonstrates quality assurance and quality control measures have been accomplished; define Valid Data as data having known and documented paths of: Origin, including theory; measurements; traceability to measurement standards; computations; uncertainty analysis of results.
Measurement uncertainty analysis techniques applied to PV performance measurements
Wells, C.
1992-10-01T23:59:59.000Z
The purpose of this presentation is to provide a brief introduction to measurement uncertainty analysis, outline how it is done, and illustrate uncertainty analysis with examples drawn from the PV field, with particular emphasis toward its use in PV performance measurements. The uncertainty information we know and state concerning a PV performance measurement or a module test result determines, to a significant extent, the value and quality of that result. What is measurement uncertainty analysis? It is an outgrowth of what has commonly been called error analysis. But uncertainty analysis, a more recent development, gives greater insight into measurement processes and tests, experiments, or calibration results. Uncertainty analysis gives us an estimate of the I interval about a measured value or an experiment`s final result within which we believe the true value of that quantity will lie. Why should we take the time to perform an uncertainty analysis? A rigorous measurement uncertainty analysis: Increases the credibility and value of research results; allows comparisons of results from different labs; helps improve experiment design and identifies where changes are needed to achieve stated objectives (through use of the pre-test analysis); plays a significant role in validating measurements and experimental results, and in demonstrating (through the post-test analysis) that valid data have been acquired; reduces the risk of making erroneous decisions; demonstrates quality assurance and quality control measures have been accomplished; define Valid Data as data having known and documented paths of: Origin, including theory; measurements; traceability to measurement standards; computations; uncertainty analysis of results.
Mota-Hernandez, Cinthya; Alvarado-Corona, Rafael
2014-01-01T23:59:59.000Z
Tectonic earthquakes of high magnitude can cause considerable losses in terms of human lives, economic and infrastructure, among others. According to an evaluation published by the U.S. Geological Survey, 30 is the number of earthquakes which have greatly impacted Mexico from the end of the XIX century to this one. Based upon data from the National Seismological Service, on the period between January 1, 2006 and May 1, 2013 there have occurred 5,826 earthquakes which magnitude has been greater than 4.0 degrees on the Richter magnitude scale (25.54% of the total of earthquakes registered on the national territory), being the Pacific Plate and the Cocos Plate the most important ones. This document describes the development of an Artificial Neural Network (ANN) based on the radial topology which seeks to generate a prediction with an error margin lower than 20% which can inform about the probability of a future earthquake one of the main questions is: can artificial neural networks be applied in seismic forecast...
Static Analysis for Dynamic Coupling Measures Yin Liu Ana Milanova
Bystroff, Chris
Static Analysis for Dynamic Coupling Measures Yin Liu Ana Milanova Department of Computer Science to the computation of dynamic coupling measures. Our approach uses static analysis, in partic- ular class analysis that inex- pensive static analysis may be used as a more convenient, more practical and more precise al
Chaos in Nonlinear Dynamical Systems Helicopter Flight-data Analysis
Taylor, James H.
Chaos in Nonlinear Dynamical Systems Helicopter Flight-data Analysis James H. Taylor1 and S of chaos in nonlinear dynamical systems is discussed, and approaches for the identification of chaos can only occur in systems with nonlinear dynamics. The recognition of chaos in a complex dynamical
Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine
Bae, Yoon Hyeok
2013-04-23T23:59:59.000Z
In the present study, a numerical simulation tool has been developed for the rotor-floater-tether coupled dynamic analysis of Multiple Unit Floating Offshore Wind Turbine (MUFOWT) in the time domain including aero-blade-tower dynamics and control...
Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine
Bae, Yoon Hyeok
2013-04-23T23:59:59.000Z
In the present study, a numerical simulation tool has been developed for the rotor-floater-tether coupled dynamic analysis of Multiple Unit Floating Offshore Wind Turbine (MUFOWT) in the time domain including aero-blade-tower dynamics and control...
Current Human Reliability Analysis Methods Applied to Computerized Procedures
Ronald L. Boring
2012-06-01T23:59:59.000Z
Computerized procedures (CPs) are an emerging technology within nuclear power plant control rooms. While CPs have been implemented internationally in advanced control rooms, to date no US nuclear power plant has implemented CPs in its main control room (Fink et al., 2009). Yet, CPs are a reality of new plant builds and are an area of considerable interest to existing plants, which see advantages in terms of enhanced ease of use and easier records management by omitting the need for updating hardcopy procedures. The overall intent of this paper is to provide a characterization of human reliability analysis (HRA) issues for computerized procedures. It is beyond the scope of this document to propose a new HRA approach or to recommend specific methods or refinements to those methods. Rather, this paper serves as a review of current HRA as it may be used for the analysis and review of computerized procedures.
Boyer, Edmond
Ultrafast magnetization dynamics in diluted magnetic semiconductors is investigated using a model based, demagnetization processes in di- luted magnetic semiconductors DMS .3 In particular, one of the most frequentlyThird-order many-body perturbation theory applied to Kondo-type dynamics in diluted magnetic
Pelster, Axel
for the stable modes in nonlinear delay systems close to a dynamical instability and derive the normal form, synergetics AMS subject classifications. 34K17, 37G10, 37L10 DOI. 10.1137/S1111111102412802 1. Introduction-organization processes in various branches of science [1, 2, 3, 4, 5, 6]. The spontaneous formation of spatial, temporal
Dynamic Analysis of Mobile Device Applications
Corey Thuen
2013-01-01T23:59:59.000Z
The On-Device Dynamic Analysis of Mobile Applications (ODAMA) project was started in an effort to protect mobile devices used in Industrial Control Systems (ICS) from cyber attack. Because mobile devices hide as much of the “computer” as possible, the user’s ability to assess the software running on their system is limited. The research team chose Google’s Android platform for this initial research because it is open source and it would give us freedom in our approach, including the ability to modify the mobile device’s operating system itself. The research team concluded that a Privileged Application was the right approach, and the result was ODAMA. This project is an important piece of the work to secure the expanding use of mobile devices with our nation’s critical infrastructure.
The Ford-Pfenning Quantum Inequalities(QI) Analysis applied to the Natario Warp Drive Spacetime.
Paris-Sud XI, Université de
The Ford-Pfenning Quantum Inequalities(QI) Analysis applied to the Natario Warp Drive Spacetime-called Quantum Inequalities(QI) that restricts the time we can observe the negative energy density.This time
Buechler, Steven
Cancer Prognosis Through Gene Expression Analysis Steven Buechler, Applied the breast cancer patients who can avoid chemotherapy without increasing the risk of recurrence. Background. Following the initial surgery, many breast cancer patients
Numerical tools applied to power reactor noise analysis Christophe Demazie`re*, Imre Pazsit
Demazičre, Christophe
Review Numerical tools applied to power reactor noise analysis Christophe Demazie`re*, Imre Pa and application of the numerical tools employed. The code that was developed yields the space and non-critical systems with an external source. Some appli- cations of these tools to power reactor
LASER SCANNING AND NOISE REDUCTION APPLIED TO 3D ROAD SURFACE ANALYSIS
LASER SCANNING AND NOISE REDUCTION APPLIED TO 3D ROAD SURFACE ANALYSIS Thorsten Schulz and Hilmar, EAWAG Email: michele.steiner@eawag.ch Abstract: Terrestrial laser scanning was applied to acquire 3D the catchment area of a road with respect to a pilot plant. As laser scanning requires only a few minutes
Nonlinear viscoelastic characterization of thin films using dynamic mechanical analysis
Payne, Debbie Flowers
1993-01-01T23:59:59.000Z
manner similar to the traditional time temperature superposition principle for linear viscoelastic materials where stress systematically compresses or expands the time scale. From dynamic mechanical testing and analysis, the experimental viscoelastic.... D. Nonlinear Characterization of Thin Film Materials. . . . Nonlinear Viscoelastic Models . Dynamic Mechanical Testing. Summary of Literature Reviewed. 5 5 7 8 III THEORETICAL ANALYSIS . A. B. C. D. Conversion of Experimental Values...
Dynamical Analysis of Evolved Agents: A Primer Randall D. Beer
Beer, Randall D.
1 Dynamical Analysis of Evolved Agents: A Primer Randall D. Beer Cognitive Science Program School: Randall D. Beer Phone: (812) 856-0873 Cognitive Science Program Fax: (812) 855-1086 1910 E. 10th St. 840 of an evolutionary search (Mathayomchan & Beer, 2002). Examples of the dynamical analysis of evolved agents include
Applied & Computational MathematicsChallenges for the Design and Control of Dynamic Energy Systems
Brown, D L; Burns, J A; Collis, S; Grosh, J; Jacobson, C A; Johansen, H; Mezic, I; Narayanan, S; Wetter, M
2011-03-10T23:59:59.000Z
The Energy Independence and Security Act of 2007 (EISA) was passed with the goal 'to move the United States toward greater energy independence and security.' Energy security and independence cannot be achieved unless the United States addresses the issue of energy consumption in the building sector and significantly reduces energy consumption in buildings. Commercial and residential buildings account for approximately 40% of the U.S. energy consumption and emit 50% of CO{sub 2} emissions in the U.S. which is more than twice the total energy consumption of the entire U.S. automobile and light truck fleet. A 50%-80% improvement in building energy efficiency in both new construction and in retrofitting existing buildings could significantly reduce U.S. energy consumption and mitigate climate change. Reaching these aggressive building efficiency goals will not happen without significant Federal investments in areas of computational and mathematical sciences. Applied and computational mathematics are required to enable the development of algorithms and tools to design, control and optimize energy efficient buildings. The challenge has been issued by the U.S. Secretary of Energy, Dr. Steven Chu (emphasis added): 'We need to do more transformational research at DOE including computer design tools for commercial and residential buildings that enable reductions in energy consumption of up to 80 percent with investments that will pay for themselves in less than 10 years.' On July 8-9, 2010 a team of technical experts from industry, government and academia were assembled in Arlington, Virginia to identify the challenges associated with developing and deploying newcomputational methodologies and tools thatwill address building energy efficiency. These experts concluded that investments in fundamental applied and computational mathematics will be required to build enabling technology that can be used to realize the target of 80% reductions in energy consumption. In addition the finding was that there are tools and technologies that can be assembled and deployed in the short term - the next 3-5 years - that can be used to significantly reduce the cost and time effective delivery of moderate energy savings in the U.S. building stock. Simulation tools, which are a core strength of current DOE computational research programs, provide only a part of the answer by providing a basis for simulation enabled design. New investments will be required within a broad dynamics and control research agenda which must focus on dynamics, control, optimization and simulation of multi-scale energy systems during design and operation. U.S. investments in high performance and high productivity computing (HP2C) should be leveraged and coupled with advances in dynamics and control to impact both the existing building stock through retrofits and also new construction. The essential R&D areas requiring investment are: (1) Characterizing the Dynamics of Multi-scale Energy Systems; (2) Control and Optimization Methodologies of Multi-scale Energy Systems Under Uncertainty; and (3) Multiscale Modeling and Simulation Enabled Design and Operation. The concept of using design and control specific computational tools is a new idea for the building industry. The potential payoffs in terms of accelerated design cycle times, performance optimization and optimal supervisory control to obtain and maintain energy savings are huge. Recent advances in computational power, computer science, and mathematical algorithms offer the foundations to address the control problems presented by the complex dynamics of whole building systems. The key areas for focus and associated metrics with targets for establishing competitiveness in energy efficient building design and operation are: (1) Scalability - Current methodology and tools can provide design guidance for very low energy buildings in weeks to months; what is needed is hours to days. A 50X improvement is needed. (2) Installation and commissioning - Current methodology and tools can target a three month window for commissioni
Studying the Cost and Value of Library and Information Services: Applying Functional Cost Analysis
analysis method, and presents selected data gathered from a larger study on the costs and value of various data on the cost of accessto electronic sourcesvia different accessmodes; on the patterns of useStudying the Cost and Value of Library and Information Services: Applying Functional Cost Analysis
Johnson, Chris
-1- Extending the Borders of Accident Investigation: Applying Novel Analysis Techniques to the Loss focussed on epidemiological and sociological approaches to the analysis of incidents and accidents. In consequence, it is becoming increasingly difficult to identify the causes of incidents and accidents back
Applying Multi-Physics Requirements and Loads in FEM Analysis and Testing – The JET KL11 Endoscope Design Verification Process
DYNAMIC MECHANICAL ANALYSIS CHARACTERIZATION OF GLOVEBOX GLOVES
Korinko, P.
2012-02-29T23:59:59.000Z
As part of the characterization of various glovebox glove material from four vendors, the permeability of gas through each type as a function of temperature was determined and a discontinuity in the permeability with temperature was revealed. A series of tests to determine the viscoelastic properties of the glove materials as a function of temperature using Dynamic Mechanical Analysis (DMA) was initiated. The glass transition temperature and the elastic and viscoelastic properties as a function of temperature up to maximum use temperature were determined for each glove material. The glass transition temperatures of the gloves were -60 C for butyl, -30 C for polyurethane, -16 C Hypalon{reg_sign}, - 16 C for Viton{reg_sign}, and -24 C for polyurethane-Hypalon{reg_sign}. The glass transition was too complex for the butyl-Hypalon{reg_sign} and butyl-Viton{reg_sign} composite gloves to be characterized by a single glass transition temperature. All of the glass transition temperatures exceed the vendor projected use temperatures.
Confirmation of standard error analysis techniques applied to EXAFS using simulations
Booth, Corwin H; Hu, Yung-Jin
2009-12-14T23:59:59.000Z
Systematic uncertainties, such as those in calculated backscattering amplitudes, crystal glitches, etc., not only limit the ultimate accuracy of the EXAFS technique, but also affect the covariance matrix representation of real parameter errors in typical fitting routines. Despite major advances in EXAFS analysis and in understanding all potential uncertainties, these methods are not routinely applied by all EXAFS users. Consequently, reported parameter errors are not reliable in many EXAFS studies in the literature. This situation has made many EXAFS practitioners leery of conventional error analysis applied to EXAFS data. However, conventional error analysis, if properly applied, can teach us more about our data, and even about the power and limitations of the EXAFS technique. Here, we describe the proper application of conventional error analysis to r-space fitting to EXAFS data. Using simulations, we demonstrate the veracity of this analysis by, for instance, showing that the number of independent dat a points from Stern's rule is balanced by the degrees of freedom obtained from a 2 statistical analysis. By applying such analysis to real data, we determine the quantitative effect of systematic errors. In short, this study is intended to remind the EXAFS community about the role of fundamental noise distributions in interpreting our final results.
Dynamic Transfer Capability Analysis with Wind Farms and Dynamic Loads
Pota, Himanshu Roy
. An investigation on the effect of dynamics loads, wind farms and flexible AC transmission system (FACTS) devices capability unnecessarily limits the power transfers and is a costly and inefficient use of a network with increasing loads, the need to transfer power over long transmission lines increases. Deregulation
A specialized Masters program in applying computation and the principles of dynamical systems
Zürich, Universität
- dents are: High Performance Computing Applied Math and Computational Methods Simulation and Modeling
Analysis of Power System Dynamics Subject to Stochastic Power Injections
DeVille, Lee
systems (PVECS), and loads such as plug-in hybrid electric vehicles [1]. This uncertainty affects1 Analysis of Power System Dynamics Subject to Stochastic Power Injections Sairaj V. Dhople a framework to study the impact of stochastic active/reactive power injections on power system dynamics
Mesoscale analysis of segmental dynamics in microphase-segregated polyurea
Grujicic, Mica
Mesoscale analysis of segmental dynamics in microphase- segregated polyurea M. Grujicic · B-atom molecular dynamics techniques. To overcome this problem, mesoscale coarse-grain simulation methods of constituent atom-size particles. Within the mesoscale methods, on the other hand, this atomistic description
Thorough approach to measurement uncertainty analysis applied to immersed heat exchanger testing
Farrington, R.B.; Wells, C.V.
1986-04-01T23:59:59.000Z
This paper discusses the value of an uncertainty analysis, discusses how to determine measurement uncertainty, and then details the sources of error in instrument calibration, data acquisition, and data reduction for a particular experiment. Methods are discussed to determine both the systematic (or bias) error in an experiment as well as to determine the random (or precision) error in the experiment. The detailed analysis is applied to two sets of conditions in measuring the effectiveness of an immersed coil heat exchanger. It shows the value of such analysis as well as an approach to reduce overall measurement uncertainty and to improve the experiment. This paper outlines how to perform an uncertainty analysis and then provides a detailed example of how to apply the methods discussed in the paper. The authors hope this paper will encourage researchers and others to become more concerned with their measurement processes and to report measurement uncertainty with all of their test results.
Analysis of azimuthal mode dynamics of mesoscale eddies
McCalpin, John David
1984-01-01T23:59:59.000Z
ANALYSIS OF AZIMUTHAL MODE DYNAMICS OF MESOSCALE EDDIES A Thesis by UOHN DAVID MCCALPIN Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1984... Major Subject: Oceanography ANALYSIS OF AZIMUTHAL MODE DYNAMICS OF MESOSCALE EDDIES A Thesis by JOHN DAVID MCCALPIN Approved as to style and content by: rew . as ano (Chairman of Committee) o ert . ei (Member) uy . rancesc &ni (Member) Robert...
Analysis of azimuthal mode dynamics of mesoscale eddies
McCalpin, John David
1984-01-01T23:59:59.000Z
ANALYSIS OF AZIMUTHAL MODE DYNAMICS OF MESOSCALE EDDIES A Thesis by UOHN DAVID MCCALPIN Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1984... Major Subject: Oceanography ANALYSIS OF AZIMUTHAL MODE DYNAMICS OF MESOSCALE EDDIES A Thesis by JOHN DAVID MCCALPIN Approved as to style and content by: rew . as ano (Chairman of Committee) o ert . ei (Member) uy . rancesc &ni (Member) Robert...
Nonlinear viscoelastic characterization of thin films using dynamic mechanical analysis
Payne, Debbie Flowers
1993-01-01T23:59:59.000Z
, experimental testing methods require extensive laboratory test time. The nonlinear results obtained from dynamic mechanical analysis require less laboratory time. This method assumes that the nonlinear stress dependent behavior may be characterized in a... manner similar to the traditional time temperature superposition principle for linear viscoelastic materials where stress systematically compresses or expands the time scale. From dynamic mechanical testing and analysis, the experimental viscoelastic...
Parallel processing techniques applied to transient stability analysis of power systems
Balachandra, Chandrakumar John
1982-01-01T23:59:59.000Z
: ( airman o Commattee Pv(Hea o Department (Mem er (Mem r (Member) December 1982 ABSTRACT Parallel Processing Techniques Applied 'to Transient Stability in Electric Power Systems. (December 1982) Chandrakumar John Balachandra, Bsc. , University of Sri... manually. 2. Comparision of the computational advantages of the above method with the conventional methods of analysis. Analysis of the same network as before, using the cluster algorithm to define the subnetwork boun- daries Tne same procedure...
Oard, Doug
Values of Stakeholders in the Net Neutrality Debate: Applying Content Analysis@surugadai.ac.jp Abstract Net neutrality is an important telecommunications policy debate. This debate is closely tied' positions on this debate. This paper examines the role of values in shaping the Net neutrality debate
Microbial Quality Analysis of Water Runoff For Biosolid-Applied Fields in Southern Arizona
Fay, Noah
Microbial Quality Analysis of Water Runoff For Biosolid-Applied Fields in Southern Arizona Nicholas Undergraduate Fellowship Program #12;Abstract Biosolids, solid waste byproducts resulting from wastewater of biosolid application on a farm's water quality. Using indicator organisms such as E. coli and total
MATH 360-2, Winter 2011 MENU Applied Analysis Project 1: Car Following and Collisions
Goerss, Paul
MATH 360-2, Winter 2011 MENU Applied Analysis Project 1: Car Following and Collisions This project time of one or more cars following each other; in particular we will try to understand the somewhat to be adequate distances between the cars. The Laplace transform comes into play because of "time delay
APPLYING QUALITATIVE HAZARD ANALYSIS TO SUPPORT QUANTITATIVE SAFETY ANALYSIS FOR PROPOSED REDUCED
WAKE SEPARATION CONOPS John F. Shortle, George Mason University, jshortle@gmu.edu, Fairfax, VA Michael investigating concepts of operations (Conops) for dynamically reducing wake vortex separation standards for closely spaced parallel runways during periods of favorable wind conditions [1], [2], [3]. These Conops
Crawford, T. Daniel
, Dynamics, and Transport in Polyelectrolyte Membrane Materials for Fuel Cells with Kirt Page, Polymers:30 pm ICTAS Room 310, Stanger Street Fuel cells based on polymer electrolyte membranes (PEM) show of structure/property relationships and molecular dynamics in polymer systems for energy applications
Model Independent Analysis of Beam Centroid Dynamics in Accelerators
Wang, Chun-xi
2003-04-21T23:59:59.000Z
Fundamental issues in Beam-Position-Monitor (BPM)-based beam dynamics observations are studied in this dissertation. The major topic is the Model-Independent Analysis (MIA) of beam centroid dynamics. Conventional beam dynamics analysis requires a certain machine model, which itself of ten needs to be refined by beam measurements. Instead of using any particular machine model, MIA relies on a statistical analysis of the vast amount of BPM data that often can be collected non-invasively during normal machine operation. There are two major parts in MIA. One is noise reduction and degrees-of-freedom analysis using a singular value decomposition of a BPM-data matrix, which constitutes a principal component analysis of BPM data. The other is a physical base decomposition of the BPM-data matrix based on the time structure of pulse-by-pulse beam and/or machine parameters. The combination of these two methods allows one to break the resolution limit set by individual BPMs and observe beam dynamics at more accurate levels. A physical base decomposition is particularly useful for understanding various beam dynamics issues. MIA improves observation and analysis of beam dynamics and thus leads to better understanding and control of beams in both linacs and rings. The statistical nature of MIA makes it potentially useful in other fields. Another important topic discussed in this dissertation is the measurement of a nonlinear Poincare section (one-turn) map in circular accelerators. The beam dynamics in a ring is intrinsically nonlinear. In fact, nonlinearities are a major factor that limits stability and influences the dynamics of halos. The Poincare section map plays a basic role in characterizing and analyzing such a periodic nonlinear system. Although many kinds of nonlinear beam dynamics experiments have been conducted, no direct measurement of a nonlinear map has been reported for a ring in normal operation mode. This dissertation analyzes various issues concerning map measurements and shows that it is possible to measure the Poincare section map (in terms of Taylor series) of a circular accelerator to a surprisingly high order and accuracy based on present BPM technology. MIA can overcome the inherent limit of BPM resolution. Nonlinear map measurements will advance understanding of the beam dynamics of a ring.
KINEMATIC, DYNAMIC AND WORKSPACE ANALYSIS OF A NOVEL 6-DOF PARALLEL MANIPULATOR
Krovi, Venkat
KINEMATIC, DYNAMIC AND WORKSPACE ANALYSIS OF A NOVEL 6-DOF PARALLEL MANIPULATOR by Hrishi L. Shah Shah SUNY BUFFALO KINEMATIC, DYNAMIC AND WORKSPACE ANALYSIS OF A NOVEL 6-DOF PARALLEL MANIPULATOR #12 .........................................................................................12 3.1. Kinematic Analysis .......
Laboratory Analysis of Vortex Dynamics For Shallow Tidal Inlets
Whilden, Kerri Ann
2010-10-12T23:59:59.000Z
LABORATORY ANALYSIS OF VORTEX DYNAMICS FOR SHALLOW TIDAL INLETS A Thesis by KERRI ANN WHILDEN Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER OF SCIENCE August 2009... Major Subject: Ocean Engineering LABORATORY ANALYSIS OF VORTEX DYNAMICS FOR SHALLOW TIDAL INLETS A Thesis by KERRI ANN WHILDEN Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree...
Decision Analysis of Dynamic Spectrum Access Rules
Juan D. Deaton; Luiz A. DaSilva; Christian Wernz
2011-12-01T23:59:59.000Z
A current trend in spectrum regulation is to incorporate spectrum sharing through the design of spectrum access rules that support Dynamic Spectrum Access (DSA). This paper develops a decision-theoretic framework for regulators to assess the impacts of different decision rules on both primary and secondary operators. We analyze access rules based on sensing and exclusion areas, which in practice can be enforced through geolocation databases. Our results show that receiver-only sensing provides insufficient protection for primary and co-existing secondary users and overall low social welfare. On the other hand, using sensing information between the transmitter and receiver of a communication link, provides dramatic increases in system performance. The performance of using these link end points is relatively close to that of using many cooperative sensing nodes associated to the same access point and large link exclusion areas. These results are useful to regulators and network developers in understanding in developing rules for future DSA regulation.
Lawrence, Rick L.
Statistics programs1 teach individuals to apply mathematical principles to the collection, analysis and statistical knowledge to the design of surveys and experiments; collection, processing, and analysis of data; and interpretation of the results. Statisticians may apply their knowledge of statistical methods to a variety
A Cumulant-based Analysis of Nonlinear Magnetospheric Dynamics
Jay R. Johnson; Simon Wing
2004-01-28T23:59:59.000Z
Understanding magnetospheric dynamics and predicting future behavior of the magnetosphere is of great practical interest because it could potentially help to avert catastrophic loss of power and communications. In order to build good predictive models it is necessary to understand the most critical nonlinear dependencies among observed plasma and electromagnetic field variables in the coupled solar wind/magnetosphere system. In this work, we apply a cumulant-based information dynamical measure to characterize the nonlinear dynamics underlying the time evolution of the Dst and Kp geomagnetic indices, given solar wind magnetic field and plasma input. We examine the underlying dynamics of the system, the temporal statistical dependencies, the degree of nonlinearity, and the rate of information loss. We find a significant solar cycle dependence in the underlying dynamics of the system with greater nonlinearity for solar minimum. The cumulant-based approach also has the advantage that it is reliable even in the case of small data sets and therefore it is possible to avoid the assumption of stationarity, which allows for a measure of predictability even when the underlying system dynamics may change character. Evaluations of several leading Kp prediction models indicate that their performances are sub-optimal during active times. We discuss possible improvements of these models based on this nonparametric approach.
Measurements and analysis of end-to-end Internet dynamics
Paxson, V [Univ. of California, Berkeley, CA (United States). Computer Science Division
1997-04-01T23:59:59.000Z
Accurately characterizing end-to-end Internet dynamics - the performance that a user actually obtains from the lengthy series of network links that comprise a path through the Internet - is exceptionally difficult, due to the network`s immense heterogeneity. At the heart of this work is a `measurement framework` in which a number of sites around the Internet host a specialized measurement service. By coordinating `probes` between pairs of these sites one can measure end-to-end behavior along O(N{sup 2}) paths for a framework consisting of N sites. Consequently, one obtains a superlinear scaling that allows measuring a rich cross-section of Internet behavior without requiring huge numbers of observation points. 37 sites participated in this study, allowing the author to measure more than 1,000 distinct Internet paths. The first part of this work looks at the behavior of end-to-end routing: the series of routers over which a connection`s packets travel. Based on 40,000 measurements made using this framework, the author analyzes: routing `pathologies` such as loops, outages, and flutter; the stability of routes over time; and the symmetry of routing along the two directions of an end-to-end path. The author finds that pathologies increased significantly over the course of 1995 and that Internet paths are heavily dominated by a single route. The second part of this work studies end-to-end Internet packet dynamics. The author analyzes 20,000 TCP transfers of 100 Kbyte each to investigate the performance of both the TCP endpoints and the Internet paths. The measurements used for this part of the study are much richer than those for the first part, but require a great degree of attention to issues of calibration, which are addressed by applying self-consistency checks to the measurements whenever possible. The author finds that packet filters are capable of a wide range of measurement errors, some of which, if undetected, can significantly taint subsequent analysis.
Fayer, Michael D.
Dynamics in Supercooled Ionic Organic Liquids and Mode Coupling Theory Analysis Jie Li, Irene Wang effect experiments are applied to study the orientational dynamics of the supercooled ionic organic law decays followed by a final exponential decay. A mode coupling theory (MCT) schematic model
A generalized shell for dynamic security analysis in operations planning
Marceau, R.J.; Mailhot, R.; Galiana, F.D. (McGill Univ., Montreal, Quebec (Canada))
1993-08-01T23:59:59.000Z
This paper introduces the concept of a generalized shell for performing power-system dynamic security analysis. The generalized shell mechanizes routines traditionally carried out by human experts and that are essential to power-system dynamic security analysis, thereby greatly accelerating the realization of complex processes. The shell semantics express high-level goals and tasks using a friendly, highly compact syntax which closely matches the language of operations planners. Typically, the shell will execute appropriate load-flow and transient-stability simulations (i.e. using commercially available simulation software), perform result analysis, make input changes and repeat this process until a user-defined goal has been achieved. A working shell prototype for performing key algorithmic processes is described and results of a typical sensitivity study are presented using a 700-bus model of the Hydro-Quebec network. It is expected that the prototype will reduce study-cycle time, improve the accuracy of dynamic security limits and, indeed, transform the working environment of operations and system planners. Eventually, it can be foreseen that the approach will gravitate towards supporting on-line dynamic security analysis.
S. Boyd EE102 Dynamic analysis of feedback
for some frequencies, small for others · step response of G shows time response of the closed-loop system of feedback 1312 #12;Heater example: dynamic analysis proportional controller of lecture 12, PSfrag of feedback 1314 #12;Let's assume · Tamb = 70 F · Tdes = 150 F (actually doesn't matter) · D is a unit step
Performance Monitoring of MPC Based on Dynamic Principal Component Analysis
Chen, Sheng
Performance Monitoring of MPC Based on Dynamic Principal Component Analysis Xue Min Tian Gong Quan Center of China MCC20 Group Co., Ltd., Shanghai 201900, China (E-mail: chen9028@163.com). School for performance monitoring of constrained multi-variable model predictive control (MPC) systems. In the proposed
Bone motion analysis from dynamic MRI: acquisition and tracking
Gilles, Benjamin
overload, impingement or femoral head instability. For both the diagnosis and the surgical planningBone motion analysis from dynamic MRI: acquisition and tracking Benjamin Gilles1 , Rosalind Perrin2 methods in order to auto- matically extract active bone kinematics from multi-slice real-time dy- namic
Air Ingress Benchmarking with Computational Fluid Dynamics Analysis
Air Ingress Benchmarking with Computational Fluid Dynamics Analysis Andrew C. Kadak Department District Beijing, China September 22-24, 2004 Abstract Air ingress accident is a complicated accident scenario is compounded by multiple physical phenomena that are involved in the air ingress event
Air Ingress Benchmarking with Computational Fluid Dynamics Analysis
1 Air Ingress Benchmarking with Computational Fluid Dynamics Analysis Tieliang Zhai Professor by the US Nuclear Regulatory Commission #12;2 Air Ingress Accident Objectives and Overall Strategy: Depresurization Pure Diffusion Natural Convection Challenging: Natural convection Multi-component Diffusion (air
Assessment and Event Based Analysis of Dynamic Wireless Networks
Paris-Sud XI, Université de
Assessment and Event Based Analysis of Dynamic Wireless Networks Denis Carvin1,2, Guillaume Kremer1 of mobile nodes in networks is significantly changing the way they are managed. Indeed, these wireless-estimation algorithm for wireless mobile networks. We then provide events' collection and distributed mining methods
Dynamical Analysis of the Fitzhugh-Nagumo Model
Beer, Randall D.
Dynamical Analysis of the Fitzhugh-Nagumo Model #12;IU/COGS-Q580/Beer This isYour Brain #12;IU/COGS-Q580/Beer Action Potentials Tateno, T., Harsch, A. and Robinson, H.P.C. (2004). Threshold Firing. Neurophysiology 92:2283-2294. #12;IU/COGS-Q580/Beer The Ionic Basis of the Action Potential Delcomyn, F. (1998
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Current research topics by the Applied Math Faculty members include: Numerical analysis and applications of finite difference, finite element and spectral ...
Morris, Edward K.
2009-03-01T23:59:59.000Z
, the ethical guidelines of the Behav- ior Analysis Certification BoardH (BACB) require data-based decision making (see Bailey & Burch, 2005, pp. 104–106, 212–214). Gernsbacher’s Review and Conclusions Gernsbacher did not review all the applied behavior... reviewers searched the 1980–1998 MEDLINE, PsychINFO, and ERIC databases under autism, infantile autism, and autistic children and read the abstracts of all the articles for those ‘‘that might contain evidence about intervention’’ and then ob- tained those...
Laboratory Analysis of Vortex Dynamics For Shallow Tidal Inlets
Whilden, Kerri Ann
2010-10-12T23:59:59.000Z
OF VORTEX DYNAMICS FOR SHALLOW TIDAL INLETS A Thesis by KERRI ANN WHILDEN Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER OF SCIENCE August 2009 Major Subject: Ocean... Engineering LABORATORY ANALYSIS OF VORTEX DYNAMICS FOR SHALLOW TIDAL INLETS A Thesis by KERRI ANN WHILDEN Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER OF SCIENCE Approved...
Avrunin, George S.
Applying Static Analysis to Software Architectures Gleb Naumovich, George S. Avrunin, Lori A. In this paper we demonstrate how static concurrency analysis tech- niques can be used to verify application, they illustrate the potential of static analysis for verifying that architecture descriptions adhere to important
Impact of environmental dynamics on economic evolution: A stylized agent-based policy analysis
Eiben, A.E. "Guszti"
Impact of environmental dynamics on economic evolution: A stylized agent-based policy analysis., Impact of environmental dynamics on economic evolution: A stylized agent- based policy analysis, Technol ICREA, Barcelona, Spain Institute of Environmental Science and Technology, Universitat Autňnoma de
Dynamic Mechanical Thermal Analysis of Virgin TR-55 Silicone Rubber
Small IV, W; Wilson, T S
2009-10-09T23:59:59.000Z
Dynamic mechanical thermal analysis (DMTA) of virgin TR-55 silicone rubber specimens was conducted. Dynamic frequency/temperature sweep tests were conducted over the ranges 0.1-100 rad/s and 30-100 C using a parallel plate test geometry. A strain of 0.2% was used, which was near the upper limit of the linear viscoelastic region of the material based on initial dynamic strain sweep tests. Master curves of G{prime} and G{double_prime} as a function of frequency were generated using time-temperature superposition (horizontal shift with initial vertical correction). The activation energy calculated from an Arrhenius fit to the horizontal shift factors was 178-355 kJ/mol. The calculated percent load retention at {approx}50 years was 61-68%.
RAVEN, a New Software for Dynamic Risk Analysis
Cristian Rabiti; Andrea Alfonsi; Joshua Cogliati; Diego Mandelli; Robert Kinoshita
2014-06-01T23:59:59.000Z
RAVEN is a generic software driver to perform parametric and probabilistic analysis of code simulating complex systems. Initially developed to provide dynamic risk analysis capabilities to the RELAP-7 code [1] is currently being generalized with the addition of Application Programming Interfaces (APIs). These interfaces are used to extend RAVEN capabilities to any software as long as all the parameters that need to be perturbed are accessible by inputs files or directly via python interfaces. RAVEN is capable to investigate the system response probing the input space using Monte Carlo, grid strategies, or Latin Hyper Cube schemes, but its strength is its focus toward system feature discovery like limit surfaces separating regions of the input space leading to system failure using dynamic supervised learning techniques. The paper will present an overview of the software capabilities and their implementation schemes followed by same application examples.
INVERSE KINEMATICS AND DYNAMICS ANALYSIS OF A THREE LEGGED PARALLEL MECHANISM ACTUATED BY AGVs
Saha, Subir Kumar
1 INVERSE KINEMATICS AND DYNAMICS ANALYSIS OF A THREE LEGGED PARALLEL MECHANISM ACTUATED BY AGVs kinematics and inverse dynamics analysis of a parallel mechanism is presented. The mechanism consists configuration. Inverse kinematics and dynamics analysis is also performed for the three actuators (mobile robots
St h ti d i l i fStochastic dynamic analysis of offshore wind turbines
Nřrvĺg, Kjetil
1 St h ti d i l i fStochastic dynamic analysis of offshore wind turbines with emphasis on fatigue Co te ts · Overview of offshore wind technology · Modelling of environmental conditions · Dynamic analysis of offshore bottom-fixed wind turbines · Modelling and dynamic analysis of floating wind turbines
Halamek, Jan; Halamkova, Lenka; Bocharova, Vera; Privman, Vladimir; Wang, Joseph; Katz, Evgeny
2011-01-01T23:59:59.000Z
Biomolecular logic systems processing biochemical input signals and producing "digital" outputs in the form of YES/NO were developed for analysis of physiological conditions characteristic of liver injury, soft tissue injury and abdominal trauma. Injury biomarkers were used as input signals for activating the logic systems. Their normal physiological concentrations were defined as logic-0 level, while their pathologically elevated concentrations were defined as logic-1 values. Since the input concentrations applied as logic 0 and 1 values were not sufficiently different, the output signals being at low and high values (0, 1 outputs) were separated with a short gap making their discrimination difficult. Coupled enzymatic reactions functioning as a biomolecular signal processing system with a built-in filter property were developed. The filter process involves a partial back-conversion of the optical-output-signal-yielding product, but only at its low concentrations, thus allowing the proper discrimination betw...
Jan Halamek; Jian Zhou; Lenka Halamkova; Vera Bocharova; Vladimir Privman; Joseph Wang; Evgeny Katz
2011-10-08T23:59:59.000Z
Biomolecular logic systems processing biochemical input signals and producing "digital" outputs in the form of YES/NO were developed for analysis of physiological conditions characteristic of liver injury, soft tissue injury and abdominal trauma. Injury biomarkers were used as input signals for activating the logic systems. Their normal physiological concentrations were defined as logic-0 level, while their pathologically elevated concentrations were defined as logic-1 values. Since the input concentrations applied as logic 0 and 1 values were not sufficiently different, the output signals being at low and high values (0, 1 outputs) were separated with a short gap making their discrimination difficult. Coupled enzymatic reactions functioning as a biomolecular signal processing system with a built-in filter property were developed. The filter process involves a partial back-conversion of the optical-output-signal-yielding product, but only at its low concentrations, thus allowing the proper discrimination between 0 and 1 output values.
POWER GRID DYNAMICS: ENHANCING POWER SYSTEM OPERATION THROUGH PRONY ANALYSIS
Ray, C.; Huang, Z.
2007-01-01T23:59:59.000Z
Prony Analysis is a technique used to decompose a signal into a series consisting of weighted complex exponentials and promises to be an effi cient way of recognizing sensitive lines during faults in power systems such as the U.S. Power grid. Positive Sequence Load Flow (PSLF) was used to simulate the performance of a simple two-area-four-generator system and the reaction of the system during a line fault. The Dynamic System Identifi cation (DSI) Toolbox was used to perform Prony analysis and use modal information to identify key transmission lines for power fl ow adjustment to improve system damping. The success of the application of Prony analysis methods to the data obtained from PSLF is reported, and the key transmission line for adjustment is identifi ed. Future work will focus on larger systems and improving the current algorithms to deal with networks such as large portions of the Western Electricity Coordinating Council (WECC) power grid.
Dynamic proteome analysis of Cyanothece sp. ATCC 51142 under constant light
Aryal, Uma K.; Stockel, Jana; Welsh, Eric A.; Gritsenko, Marina A.; Nicora, Carrie D.; Koppenaal, David W.; Smith, Richard D.; Pakrasi, Himadri B.; Jacobs, Jon M.
2012-02-03T23:59:59.000Z
Understanding the dynamic nature of protein abundances provides insights into protein turnover not readily apparent from conventional, static mass spectrometry measurements. This level of data is particularly informative when surveying protein abundances in biological systems subjected to large perturbations or alterations in environment such as cyanobacteria. Our current analysis expands upon conventional proteomic approaches in cyanobacteria by measuring dynamic changes of the proteome using a 13C15N-L-leucine metabolic labeling in Cyanothece ATCC51142. Metabolically labeled Cyanothece ATCC51142 cells grown under nitrogen sufficient conditions in continuous light were monitored longitudinally for isotope incorporation over a 48 h period, revealing 422 proteins with dynamic changes in abundances. In particular, proteins involved in carbon fixation, pentose phosphate pathway, cellular protection, redox regulation, protein folding, assembly and degradation showed higher levels of isotope incorporation suggesting that these biochemical pathways are important for growth under non-diazotrophic conditions. Calculation of relative isotope abundances (RIA) values allowed to measure actual active protein synthesis over time for different biochemical pathways under non-diazotrophic conditions. Overall results demonstrated the utility of 'non-steady state' pulsed metabolic labeling for systems-wide dynamic quantification of the proteome in Cyanothece ATCC51142 that can also be applied to other cyanobacteria.
SystemC Analysis of a new Dynamic Power Management Architecture Massimo Conti
Paris-Sud XI, Université de
SystemC Analysis of a new Dynamic Power Management Architecture Massimo Conti Universitŕ dynamic power management architecture of a System on Chip. The Power State Machine describing the status Power Management Architecture Dynamic Power Management (DPM) is a design methodology that dynamically
Hybrid spectral/finite element analysis of dynamic delamination of patterned thin films
Sottos, Nancy R.
Hybrid spectral/finite element analysis of dynamic delamination of patterned thin films Phuong Tran Accepted 10 March 2008 Available online 20 March 2008 Keywords: Thin film Adhesion Delamination Dynamic analysis is performed to investigate the dynamic edge delamination of patterned thin films from a substrate
Time Series Analysis Methods Applied to the Super-Kamiokande I Data
Gioacchino Ranucci
2005-05-25T23:59:59.000Z
The need to unravel modulations hidden in noisy time series of experimental data is a well known problem, traditionally attacked through a variety of methods, among which a popular tool is the so called Lomb-Scargle periodogram. Recently, for a class of problems in the solar neutrino field, it has been proposed an alternative maximum likelihood based approach, intended to overcome some intrinsic limitations affecting the Lomb-Scargle implementation. This work is focused to highlight the features of the likelihood methodology, introducing in particular an analytical approach to assess the quantitative significance of the potential modulation signals. As an example, the proposed method is applied to the time series of the measured values of the 8B neutrino flux released by the Super-Kamiokande collaboration, and the results compared with those of previous analysis performed on the same data sets. It is also examined in detail the comparison between the Lomb-Scargle and the likelihood methods, giving in the appendix the complete demonstration of their close relationship.
Kron`s reduction method applied to the time stepping finite element analysis of induction machines
Degeneff, R.C.; Gutierrez, M.R.; Salon, S.J.; Burow, D.W. [Rensselaer Polytechnic Inst., Troy, NY (United States). Electric Power Engineering Dept.] [Rensselaer Polytechnic Inst., Troy, NY (United States). Electric Power Engineering Dept.; Nevins, R.J. [Martin Marietta Corp., Schenectady, NY (United States)] [Martin Marietta Corp., Schenectady, NY (United States)
1995-12-01T23:59:59.000Z
The behavior of large induction motors during transient as well as steady state running conditions is of significant interest to the power industry. A variety of analytical predictive tools are employed to aid the design and predict their operation under transient and steady state conditions. One of the most powerful method for investigating the transient behavior of induction machines is a coupled time stepping finite element analysis which can combine electromagnetic fields, circuits and mechanical systems. Due to the complexity of the finite element induction machine model and the resulting large number of describing equations, the computation time required for such programs to solve practical problems becomes a major limitation. This becomes even more of a concern when different design options or operating scenarios are evaluated. This paper presents a strategy to reduce the required running time in order to make a parametric study of induction machines such as the assessment of different design options feasible. This is accomplished by reducing the number of finite element equations that must be solved while maintaining the same level of accuracy of solutions. This method is based on Kron`s network reduction work for linear systems and has successfully been applied to large lumped parameter model of transformers. This paper illustrates the reduction method by comparing the flux density in the air gap for a complete FEM model of an induction machine to that of the reduced model. The results are essentially identical with a reduction in computational time of approximately 71%.
Thermoacoustic instability - a dynamical system and time domain analysis
Sayadi, Taraneh; Schmid, Peter; Richecoeur, Franck; Massot, Marc
2013-01-01T23:59:59.000Z
This study focuses on the Rijke tube problem, which includes features relevant to the modeling of thermoacoustic coupling in reactive flows: a compact acoustic source, an empirical model for the heat source, and nonlinearities. This system features both linear and nonlinear flow regimes with complex dynamical behavior. In order to synthesize accurate time-series, we tackle this problem from a numerical point-of-view, and start by proposing a dedicated solver designed for dealing with the underlying stiffness, in particular, the retarded time and the discontinuity at the location of the heat source. Stability analysis is performed on the limit of the low amplitude perturbations by means of the projection method proposed by Jarlebring (2008), which alleviates the linearization of the retarded term. The results are then compared to the analytical solution of the undamped system, in addition to the analysis based on Galerkin projection. The method provides insight into the consequence of the simplification due to...
of induction machines Analysis and control of synchronous machines Analysis and control of brushless DC machine theory. Techniques for dynamic analysis of electromechanical machines: dq representations of machines. Credits: 4 Terms Offered: Spring, in alternate years Prerequisites: ENGR 331, Co-requisite: ECE
Garnier, Josselin
multiscale analysis the hotspot dynamics during the deceleration phase of inertial confinement December 2004) paper is devoted study deceleration phase inertial confinement capsules. First self. [DOI: 10.1063/1.1825389] INTRODUCTION dynamics the deceleration phase inertial con finement fusion
A Polynomial Chaos Approach to the Robust Analysis of the Dynamic Behaviour of Friction Systems
Paris-Sud XI, Université de
. Key word: Dry friction systems, Nonlinear dynamic systems, stability, limit cycle, robustness, uncertainty propagation, polynomial chaos, Lyapunov function, SOS programming. 1. Introduction Dry friction1 A Polynomial Chaos Approach to the Robust Analysis of the Dynamic Behaviour of Friction Systems
Essays on Price Dynamics, Welfare Analysis, Household Food Insecurity in Mexico
Magana Lemus, David
2013-09-20T23:59:59.000Z
Higher and more volatile food prices, as reported in recent years, have consequences on household welfare and potentially on public policy. Analysis of agricultural commodities price dynamics, welfare ...
Dynamic analysis of policy drivers for bioenergy commodity markets
Robert F. Jeffers; Jacob J. Jacobson; Erin M. Searcy
2001-01-01T23:59:59.000Z
Biomass is increasingly being considered as a feedstock to provide a clean and renewable source of energy in the form of both liquid fuels and electric power. In the United States, the biofuels and biopower industries are regulated by different policies and have different drivers which impact the maximum price the industries are willing to pay for biomass. This article describes a dynamic computer simulation model that analyzes future behavior of bioenergy feedstock markets given policy and technical options. The model simulates the long-term dynamics of these markets by treating advanced biomass feedstocks as a commodity and projecting the total demand of each industry as well as the market price over time. The model is used for an analysis of the United States bioenergy feedstock market that projects supply, demand, and market price given three independent buyers: domestic biopower, domestic biofuels, and foreign exports. With base-case assumptions, the biofuels industry is able to dominate the market and meet the federal Renewable Fuel Standard (RFS) targets for advanced biofuels. Further analyses suggest that United States bioenergy studies should include estimates of export demand in their projections, and that GHG-limiting policy would partially shield both industries from exporter dominance.
State machine analysis of sensor data from dynamic processes
Cook, William R.; Brabson, John M.; Deland, Sharon M.
2003-12-23T23:59:59.000Z
A state machine model analyzes sensor data from dynamic processes at a facility to identify the actual processes that were performed at the facility during a period of interest for the purpose of remote facility inspection. An inspector can further input the expected operations into the state machine model and compare the expected, or declared, processes to the actual processes to identify undeclared processes at the facility. The state machine analysis enables the generation of knowledge about the state of the facility at all levels, from location of physical objects to complex operational concepts. Therefore, the state machine method and apparatus may benefit any agency or business with sensored facilities that stores or manipulates expensive, dangerous, or controlled materials or information.
Nonlinear dynamic analysis of an optimal particle damper
Martín Sánchez; C. Manuel Carlevaro
2011-10-12T23:59:59.000Z
We study the dynamical behavior of a single degree of freedom mechanical system with a particle damper. The particle (granular) damping was optimized for the primary system operating condition by using an appropriate gap size for a prismatic enclosure. The particles absorb the kinetic energy of the vibrating structure and convert it into heat through the inelastic collisions and friction. This results in a highly nonlinear mechanical system. Considering linear signal analysis, state space reconstruction, Poincar\\'e sections and the determination of maximal Lyapunov exponents, the motion of the granular system inside the enclosure is characterized for a wide frequency range. With the excitation frequency as control parameter, either regular and chaotic motion of the granular bed are found and their influence on the damping is analyzed.
Analysis of Dynamical Recognizers Alan D. Blair & Jordan B. Pollack
Pollack, Jordan B.
examples. The resulting networks often displayed complex limit dynamics which were fractal in nature (Kolen
A step towards quantitative lipoprotein density profiling analysis: applied Rayleigh scattering
Nowlin, Michael
2009-05-15T23:59:59.000Z
is imperative in assessing risk factors accurately. Light scattering techniques, primarily Rayleigh scattering, are applied to density separated serum samples in resulting in improved qualitative data with progress in quantitative measurements through imaging...
Kohlhepp, Katherine D.
2006-04-12T23:59:59.000Z
Due to the scarcity of Human Reliability Analysis (HRA) data, one of the key elements of any HRA analysis is use of engineering judgment. The Electric Power Research Institute (EPRI) HRA Calculator guides the user through ...
Course STAT 6348.501 Applied Multivariate Analysis Professor Robert Serfling
Serfling, Robert
Analysis. The Classification Problem: Discriminant Analysis, Support Vector Machines, Classification the professor's notes accompanied by handouts distributed by email and from library eBooks. Also, other sources). T 11/15 R 11/17 Classification: discriminant analysis; support vector machines. Support vector machines
A New Bifurcation Analysis for Power System Dynamic Voltage Stability Studies
A New Bifurcation Analysis for Power System Dynamic Voltage Stability Studies Garng M. Huang bifurcation, saddle-node and Hopf bifurcation. In this paper the dynamic voltage stability of power system, Senior Member, IEEE, Liang Zhao, Xuefeng Song Abstract: The dynamic of a large class of power systems can
Sensitivity analysis of a dynamic model for submerged arc silicon furnaces.
Foss, Bjarne A.
Sensitivity analysis of a dynamic model for submerged arc silicon furnaces. B. F. Lund1 , B. A for a dynamic model of submerged arc silicon furnaces. The model we study, called "Simod", was developed updating a nonlinear, dynamic model of a silicon furnace. We have identified a parameter set that has
VIRUS DYNAMICS: A GLOBAL ANALYSIS PATRICK DE LEENHEER AND HAL L. SMITH
De Leenheer, Patrick
VIRUS DYNAMICS: A GLOBAL ANALYSIS PATRICK DE LEENHEER AND HAL L. SMITH SIAM J. APPL. MATH. c 2003 and Nelson [SIAM Rev., 41 (1999), pp. 344] and Nowak and May [Virus Dynamics, Oxford University Press, New of their dynamics. If the basic reproduction number R0 virus is cleared and the disease dies out; if R0 > 1
Applied Dynamic Analysis of the Global Economy (ADAGE) Model | Open Energy
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a <Alaska
Numerical methods of integration applied in the nonlinear dynamic analysis of shells of revolution
Tillerson, Joe Richard
1970-01-01T23:59:59.000Z
'h ? Order Rungc ? Kutta Forsn)las Houbolt Metho1I Ch n, Cox, and Benfield Procedure Constant Average Acceleration (8 ? -1/4) Linear Acceleration (B=l/6) Step Function Acceleration Variation (8. =1/8) Fox and Goodwin Formulation (8=1/12) Second... Shell of Revolution Response Studies Runge-Kntta Evaluation 35 43 43 TEHLE 0: COIJTEJITS (Con tinued) C, J. EP'J . R Page isan, Cox, and henfield Evaluation (B. =J. I6, I/O, 1/12, and 0) C mparison of !Inubolt Jiethod an;l Chan, Cox, ; nd...
Integrated dynamic landscape analysis and modeling system (IDLAMS) : installation manual.
Li, Z.; Majerus, K. A.; Sundell, R. C.; Sydelko, P. J.; Vogt, M. C.
1999-02-24T23:59:59.000Z
The Integrated Dynamic Landscape Analysis and Modeling System (IDLAMS) is a prototype, integrated land management technology developed through a joint effort between Argonne National Laboratory (ANL) and the US Army Corps of Engineers Construction Engineering Research Laboratories (USACERL). Dr. Ronald C. Sundell, Ms. Pamela J. Sydelko, and Ms. Kimberly A. Majerus were the principal investigators (PIs) for this project. Dr. Zhian Li was the primary software developer. Dr. Jeffrey M. Keisler, Mr. Christopher M. Klaus, and Mr. Michael C. Vogt developed the decision analysis component of this project. It was developed with funding support from the Strategic Environmental Research and Development Program (SERDP), a land/environmental stewardship research program with participation from the US Department of Defense (DoD), the US Department of Energy (DOE), and the US Environmental Protection Agency (EPA). IDLAMS predicts land conditions (e.g., vegetation, wildlife habitats, and erosion status) by simulating changes in military land ecosystems for given training intensities and land management practices. It can be used by military land managers to help predict the future ecological condition for a given land use based on land management scenarios of various levels of training intensity. It also can be used as a tool to help land managers compare different land management practices and further determine a set of land management activities and prescriptions that best suit the needs of a specific military installation.
Humberto E. Garcia; Amit Mohanty; Wen-Chiao Lin; Robert S. Cherry
2013-04-01T23:59:59.000Z
Dynamic analysis of hybrid energy systems (HES) under flexible operation and variable renewable generation is considered in order to better understand various challenges and opportunities associated with the high system variability arising from the integration of renewable energy into the power grid. Unique consequences are addressed by devising advanced HES solutions in which multiple forms of energy commodities, such as electricity and chemical products, may be exchanged. Dynamic models of various unit operations are developed and integrated within two different HES options. One HES option, termed traditional, produces electricity only and consists of a primary heat generator (PHG) (e.g., a small modular reactor), a steam turbine generator, a wind farm, and a battery storage. The other HES option, termed advanced, includes not only the components present in the traditional option but also a chemical plant complex to repurpose excess energy for non-electricity services, such as for the production of chemical goods (e.g., transportation fuel). In either case, a given HES is connected to the power grid at a point of common coupling and requested to deliver a certain electricity generation profile as dictated by a regional power grid operator based on a predicted demand curve. Dynamic analysis of these highly-coupled HES are performed to identify their key dynamical properties and limitations and to prescribe solutions for best managing and mitigating the high variability introduced from incorporating renewable energy into the energy mix. A comparative dynamic cost analysis is also conducted to determine best HES options. The cost function includes a set of metrics for computing fixed costs, such as fixed operations and maintenance (O&M) and overnight capital costs, and also variable operational costs, such as cost of variability, variable O&M cost, and cost of environmental impact, together with revenues. Assuming different options for implementing PHG (e.g., natural gas, coal, nuclear), preliminary results identify the level of renewable penetration at which a given advanced HES option (e.g., a nuclear hybrid) becomes increasingly more economical than a traditional electricity-only generation solution. Conditions are also revealed under which carbon resources may be better utilized as carbon sources for chemical production rather than as combustion material for electricity generation.
Krogman, Mitchell S. (Mitchell Spencer)
2013-01-01T23:59:59.000Z
This thesis describes the analysis of a locking mechanism designed by ProTeqt Technologies. More specifically, the analysis considers the mechanism after the implementation of a resonantly coupled circuit used to receive ...
of model complexity How long can fisheries management delay action in response to climate change? (Brown, and management delay (the > the delay, the more change is necessary) this is a dynamic system that requires management robust to ecological and climate change · Fisheries management is now based on equilibrium
Hoffman, Forrest M.
and Determining Importance Values for AmeriFlux Sites Forrest M. Hoffman Oak Ridge National Laboratory Building. Hargrove Oak Ridge National Laboratory Building 1507, MS 6407 Oak Ridge TN 378316407 8652412748 hnw@fire.esd.ornl.gov March 31, 2006 New Approaches to Ecological Regionalization Symposium Abstract We apply a multivariate
Nonrigid Motion Analysis Based on Dynamic Refinement of Finite Element Models
Sarkar, Sudeep
Nonrigid Motion Analysis Based on Dynamic Refinement of Finite Element Models Leonid V. Tsap finite element models. The method is based on the iterative analysis of the differences betweenĂPhysically-based vision, deformable models, nonrigid motion analysis, biomedical applications, finite element analysis. Ă¦
Popova, Elmira
Bayesian analysis and decisions in nuclear power plant maintenance Elmira Popova, David Morton, Paul Damien are then applied to solving an important problem in a nuclear power plant system at the South Texas Project (STP) Electric Generation Station. STP is one of the newest and largest nuclear power plants in the US
Analysis of the influence of tool dynamics in diamond turning
Fawcett, S.C.; Luttrell, D.E.; Keltie, R.F.
1988-12-01T23:59:59.000Z
This report describes the progress in defining the role of machine and interface dynamics on the surface finish in diamond turning. It contains a review of literature from conventional and diamond machining processes relating tool dynamics, material interactions and tool wear to surface finish. Data from experimental measurements of tool/work piece interface dynamics are presented as well as machine dynamics for the DTM at the Center.
Particle sizing by dynamic light scattering: non-linear cumulant analysis
Alastair G. Mailer; Paul S. Clegg; Peter N. Pusey
2015-04-24T23:59:59.000Z
We revisit the method of cumulants for analysing dynamic light scattering data in particle sizing applications. Here the data, in the form of the time correlation function of scattered light, is written as a series involving the first few cumulants (or moments) of the distribution of particle diffusion constants. Frisken (2001 Applied Optics 40, 4087) has pointed out that, despite greater computational complexity, a non-linear, iterative, analysis of the data has advantages over the linear least-squares analysis used originally. In order to explore further the potential and limitations of cumulant methods we analyse, by both linear and non-linear methods, computer-generated data with realistic `noise', where the parameters of the distribution can be set explicitly. We find that, with modern computers, non-linear analysis is straightforward and robust. The mean and variance of the distribution of diffusion constants can be obtained quite accurately for distributions of width (standard deviation/mean) up to about 0.6, but there appears to be little prospect of obtaining meaningful higher moments.
Kohlhepp, Katherine D.
2006-04-12T23:59:59.000Z
Due to the scarcity of Human Reliability Analysis (HRA) data, one of the key elements of any HRA analysis is use of engineering judgment. The Electric Power Research Institute (EPRI) HRA Calculator guides the user through the steps of any HRA...
Analysis of Dynamic Policies # A. Prasad Sistla, Min Zhou
Sistla, A. Prasad
of Computer Science, Chicago, USA Abstract The paper considers the problem of modeling and analyzing dynamic Trust management system. Key words: Dynamic Access Control Policies, Security Properties, Trust by the NSF grant CCRÂ0205365. Preprint submitted to Elsevier 11 December 2007 #12; dynamic systems modeled
Murray, William
1960-01-01T23:59:59.000Z
in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE January 1960 Maj or Subj ect: Mechanical Engineering A COMPARISON OF ANALOG METHODS IN HEAT FLOW ANALYSIS WITH SIMPLIFIED MATHEMATICAL METHODS AS APPLIED TO FLIGHT STRUCTURES... and require lengthy and sometimes difficult mathematical computations to arrive at a solution. It is obvious that there is a need for a simple, rapid, and reliable method of solving complex problems involving heat flow. It is the purpose...
Using Dynamic DCF and Real Option Methods for Economic Analysis in NI43-101 Technical Reports
Using Dynamic DCF and Real Option Methods for Economic Analysis in NI43-101 Technical Reports or staff. #12;Abstract The introduction of Dynamic Discounted Cash Flow ("Dynamic DCF") and Real Options
Observation and Analysis of Applied Force and Vibrations on Road Signs
Ervin, Elizabeth K.
Cross-sectional area of sign = 1/8 sq in Dynamic Force = (AV^2)/2 (compressed air) = P/RT = 0.000014 pci F(air) = 0.5*(0.000014 pci)*(1/8 sq in)*(3.17515 in/s)^2 F(air) = 0.000009 lb (chlorine gas) = 0.0001156 pci F(chlorine gas) = 0.000073 lb (ammonia gas) = 0.000031 pci F(ammonia gas) = 0.00002 lb #12
Dynamic analysis methods for detecting anomalies in asynchronously interacting systems.
Kumar, Akshat; Solis, John Hector; Matschke, Benjamin
2014-01-01T23:59:59.000Z
Detecting modifications to digital system designs, whether malicious or benign, is problematic due to the complexity of the systems being analyzed. Moreover, static analysis techniques and tools can only be used during the initial design and implementation phases to verify safety and liveness properties. It is computationally intractable to guarantee that any previously verified properties still hold after a system, or even a single component, has been produced by a third-party manufacturer. In this paper we explore new approaches for creating a robust system design by investigating highly-structured computational models that simplify verification and analysis. Our approach avoids the need to fully reconstruct the implemented system by incorporating a small verification component that dynamically detects for deviations from the design specification at run-time. The first approach encodes information extracted from the original system design algebraically into a verification component. During run-time this component randomly queries the implementation for trace information and verifies that no design-level properties have been violated. If any deviation is detected then a pre-specified fail-safe or notification behavior is triggered. Our second approach utilizes a partitioning methodology to view liveness and safety properties as a distributed decision task and the implementation as a proposed protocol that solves this task. Thus the problem of verifying safety and liveness properties is translated to that of verifying that the implementation solves the associated decision task. We develop upon results from distributed systems and algebraic topology to construct a learning mechanism for verifying safety and liveness properties from samples of run-time executions.
A threat analysis framework as applied to critical infrastructures in the Energy Sector.
Michalski, John T.; Duggan, David Patrick
2007-09-01T23:59:59.000Z
The need to protect national critical infrastructure has led to the development of a threat analysis framework. The threat analysis framework can be used to identify the elements required to quantify threats against critical infrastructure assets and provide a means of distributing actionable threat information to critical infrastructure entities for the protection of infrastructure assets. This document identifies and describes five key elements needed to perform a comprehensive analysis of threat: the identification of an adversary, the development of generic threat profiles, the identification of generic attack paths, the discovery of adversary intent, and the identification of mitigation strategies.
Iman Marvian; Robert W. Spekkens
2014-12-05T23:59:59.000Z
Finding the consequences of symmetry for open system quantum dynamics is a problem with broad applications, including describing thermal relaxation, deriving quantum limits on the performance of amplifiers, and exploring quantum metrology in the presence of noise. The symmetry of the dynamics may reflect a symmetry of the fundamental laws of nature, a symmetry of a low-energy effective theory, or it may describe a practical restriction such as the lack of a reference frame. In this paper, we apply some tools of harmonic analysis together with ideas from quantum information theory to this problem. The central idea is to study the decomposition of quantum operations---in particular, states, measurements and channels---into different modes, which we call modes of asymmetry. Under symmetric processing, a given mode of the input is mapped to the corresponding mode of the output, implying that one can only generate a given output if the input contains all of the necessary modes. By defining monotones that quantify the asymmetry in a particular mode, we also derive quantitative constraints on the resources of asymmetry that are required to simulate a given asymmetric operation. We present applications of our results for deriving bounds on the probability of success in nondeterministic state transitions, such as quantum amplification, and a simplified formalism for studying the degradation of quantum reference frames.
Analysis of Asteroid (216) Kleopatra using dynamical and structural constraints
Hirabayashi, Masatoshi
2013-01-01T23:59:59.000Z
Given the spin state by Magnusson (1990), the shape model by Ostro et al. (2000), and the mass by Descamps et al. (2011), this paper evaluates a dynamically and structurally stable size of Asteroid (216) Kleopatra. In particular, we investigate two different failure modes: material shedding from the surface and structural failure of the internal body. We construct zero-velocity curves in the vicinity of this asteroid to determine surface shedding, while we utilize a limit analysis to calculate the lower and upper bounds of structural failure under the zero-cohesion assumption. Surface shedding does not occur at the current spin period (5.385 hr) and cannot directly initiate the formation of the satellites. On the other hand, this body may be close to structural failure; in particular, the neck may be situated near a plastic state. In addition, the neck's sensitivity to structural failure changes as the body size varies. We conclude that plastic deformation has probably occurred around the neck part in the pas...
International Institute for Applied Systems Analysis Schlossplatz 1 A-2361 Laxenburg Austria
Hargrove, William W.
IN REMOTE SENSING.......................................................10 4.2. CO2 BURNING -- A SPECIFIC............................................................................12 4.3.1. SOIL CO2 AND CH4 RESPIRATION........................................................12 4 2.1.4. FUNDING (Cost effectiveness analysis) ......................................................5
Dryer, Frederick L.
2009-04-10T23:59:59.000Z
This project was an integrated experimental/numerical effort to study pyrolysis and oxidation reactions and mechanisms for small-molecule hydrocarbon structures under conditions representative of combustion environments. The experimental aspects of the work were conducted in large-diameter flow reactors, at 0.3 to 18 atm pressure, 500 to 1100 K temperature, and 10^{-2} to 2 seconds reaction time. Experiments were also conducted to determine reference laminar flame speeds using a premixed laminar stagnation flame experiment and particle image velocimetry, as well as pressurized bomb experiments. Flow reactor data for oxidation experiments include: (1)adiabatic/isothermal species time-histories of a reaction under fixed initial pressure, temperature, and composition; to determine the species present after a fixed reaction time, initial pressure; (2)species distributions with varying initial reaction temperature; (3)perturbations of a well-defined reaction systems (e.g. CO/H_{2}/O_{2} or H_{2}/O_{2})by the addition of small amounts of an additive species. Radical scavenging techniques are applied to determine unimolecular decomposition rates from pyrolysis experiments. Laminar flame speed measurements are determined as a function of equivalence ratio, dilution, and unburned gas temperature at 1 atm pressure. Hierarchical, comprehensive mechanistic construction methods were applied to develop detailed kinetic mechanisms which describe the measurements and literature kinetic data. Modeling using well-defined and validated mechanisms for the CO/H_{2}/Oxidant systems and perturbations of oxidation experiments by small amounts of additives were also used to derive absolute reaction rates and to investigate the compatibility of published elementary kinetic and thermochemical information. Numerical tools were developed and applied to assess the importance of individual elementary reactions to the predictive performance of the developed mechanisms and to assess the uncertainties in elementary rate constant evaluations.
Analysis of Petroleum Technology Advances Through Applied Research by Independent Oil Producers
Brashear, Jerry P.; North, Walter B.; Thomas Charles P.; Becker, Alan B.; Faulder, David D.
2000-01-12T23:59:59.000Z
Petroleum Technology Advances Through Applied Research by Independent Oil Producers is a program of the National Oil Research Program, U.S. Department of Energy. Between 1995 and 1998, the program competitively selected and cost-shared twenty-two projects with small producers. The purpose was to involve small independent producers in testing technologies of interest to them that would advance (directly or indirectly) one or more of four national program objectives: (1) Extend the productive life of reservoirs; (2) Increase production and/or reserves; (3) Improve environmental performance; and (4) Broaden the exchange of technology information.
EXTREME VALUE ANALYSIS FOR CLIMATE TIME SERIES Institute for Mathematics Applied to Geosciences
Katz, Richard
Extremes (3) Temporal Dependence / Scaling of Climate Extremes (4) Interpretation of Tail Behavior of floods: Design of dams Flood plain regulation ("100-year flood") #12;6 · Non-Stationarity -- Sources extremes) Sub-divide (e. g., separate analysis by month) #12;7 (2) Statistics of Climate Extremes · Tail
Analysis of the Ultra-fast Switching Dynamics in a Hybrid MOSFET/Driver
Tang, T.; Burkhart, C.; /SLAC
2011-08-17T23:59:59.000Z
The turn-on dynamics of a power MOSFET during ultra-fast, {approx} ns, switching are discussed in this paper. The testing was performed using a custom hybrid MOSFET/Driver module, which was fabricated by directly assembling die-form components, power MOSFET and drivers, on a printed circuit board. By using die-form components, the hybrid approach substantially reduces parasitic inductance, which facilitates ultra-fast switching. The measured turn on time of the hybrid module with a resistive load is 1.2 ns with an applied voltage of 1000 V and drain current of 33 A. Detailed analysis of the switching waveforms reveals that switching behavior must be interpreted differently in the ultra-fast regime. For example, the gate threshold voltage to turn on the device is observed to increase as the switching time decreases. Further analysis and simulation of MOSFET switching behavior shows that the minimum turn on time scales with the product of the drain-source on resistance and drain-source capacitance, R{sub DS(on)}C{sub OSS}. This information will be useful in power MOSFET selection and gate driver design for ultra-fast switching applications.
MODELING AND ANALYSIS OF THE DYNAMICS OF DRY-FRICTION-DAMPED STRUCTURAL SYSTEMS
Paris-Sud XI, Université de
MODELING AND ANALYSIS OF THE DYNAMICS OF DRY-FRICTION-DAMPED STRUCTURAL SYSTEMS by Olivier J . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.1 Nonlinear methods for the analysis of friction-damped systems . . . . . . . . . . . . . . . . . . . . . . . . 15 II. HYBRID FREQUENCY-TIME DOMAIN METHODS FOR THE ANALYSIS OF COMPLEX STRUCTURAL SYSTEMS WITH DRY
Koch, C.D.; Pirkle, F.L.; Schmidt, J.S.
1981-01-01T23:59:59.000Z
A Principal Components Analysis (PCA) has been written to aid in the interpretation of multivariate aerial radiometric data collected by the US Department of Energy (DOE) under the National Uranium Resource Evaluation (NURE) program. The variations exhibited by these data have been reduced and classified into a number of linear combinations by using the PCA program. The PCA program then generates histograms and outlier maps of the individual variates. Black and white plots can be made on a Calcomp plotter by the application of follow-up programs. All programs referred to in this guide were written for a DEC-10. From this analysis a geologist may begin to interpret the data structure. Insight into geological processes underlying the data may be obtained.
Coupled thermal analysis applied to the study of the rod ejection accident
Gonnet, M. [AREVA NP, TOUR AREVA - 1 Place Jean MILLIER, 92084 Paris La Defense Cedex (France)
2012-07-01T23:59:59.000Z
An advanced methodology for the assessment of fuel-rod thermal margins under RIA conditions has been developed by AREVA NP SAS. With the emergence of RIA analytical criteria, the study of the Rod Ejection Accident (REA) would normally require the analysis of each fuel rod, slice by slice, over the whole core. Up to now the strategy used to overcome this difficulty has been to perform separate analyses of sampled fuel pins with conservative hypotheses for thermal properties and boundary conditions. In the advanced methodology, the evaluation model for the Rod Ejection Accident (REA) integrates the node average fuel and coolant properties calculation for neutron feedback purpose as well as the peak fuel and coolant time-dependent properties for criteria checking. The calculation grid for peak fuel and coolant properties can be specified from the assembly pitch down to the cell pitch. The comparative analysis of methodologies shows that coupled methodology allows reducing excessive conservatism of the uncoupled approach. (authors)
Multi-attribute criteria applied to electric generation energy system analysis LDRD.
Kuswa, Glenn W.; Tsao, Jeffrey Yeenien; Drennen, Thomas E.; Zuffranieri, Jason V.; Paananen, Orman Henrie; Jones, Scott A.; Ortner, Juergen G. (DLR, German Aerospace, Cologne); Brewer, Jeffrey D.; Valdez, Maximo M.
2005-10-01T23:59:59.000Z
This report began with a Laboratory-Directed Research and Development (LDRD) project to improve Sandia National Laboratories multidisciplinary capabilities in energy systems analysis. The aim is to understand how various electricity generating options can best serve needs in the United States. The initial product is documented in a series of white papers that span a broad range of topics, including the successes and failures of past modeling studies, sustainability, oil dependence, energy security, and nuclear power. Summaries of these projects are included here. These projects have provided a background and discussion framework for the Energy Systems Analysis LDRD team to carry out an inter-comparison of many of the commonly available electric power sources in present use, comparisons of those options, and efforts needed to realize progress towards those options. A computer aid has been developed to compare various options based on cost and other attributes such as technological, social, and policy constraints. The Energy Systems Analysis team has developed a multi-criteria framework that will allow comparison of energy options with a set of metrics that can be used across all technologies. This report discusses several evaluation techniques and introduces the set of criteria developed for this LDRD.
Risk Dynamics?An Analysis for the Risk of Change
Huang, Tailin
2010-01-01T23:59:59.000Z
Is Quantitative Risk Assessment?" Risk Analysis, Aubrey,quantitative methods of how people do science, engineering and risk analysisthe Quantitative Definition of Risk." Risk Analysis, 1(1),
ECI 212A: Finite Element Procedures in Applied Mechanics
Schladow, S. Geoffrey
), "The Finite Element Method: Linear Static and Dynamic Finite Element Analysis," Prentice), "Concepts and Appli- cations of Finite Element Analysis," 4th Ed., John Wiley and Sons, NY. 5. M. S, Philadelphia, PA. 6. G. Strang and G. J. Fix (1973), "An Analysis of the Finite Element Method," Prentice
Sadoulet, Elisabeth
Understanding Sectoral Labor Market Dynamics: An Equilibrium Analysis of the Oil and Gas Field examines the response of employment and wages in the US oil and gas ...eld services industry to changes the dynamic response of wages and employment in the U.S. Oil and Gas Field Services (OGFS) industry to changes
Analysis of in vivo dynamics of influenza virus infection in mice using a GFP reporter virus
Analysis of in vivo dynamics of influenza virus infection in mice using a GFP reporter virus Balaji for review December 30, 2009) Influenza A virus is being extensively studied because of its major impact on human and animal health. However, the dynamics of influenza virus infection and the cell types infected
Lyapunov Analysis Captures the Collective Dynamics of Large Chaotic Systems Kazumasa A. Takeuchi,1,2
Sano, Masaki
Lyapunov Analysis Captures the Collective Dynamics of Large Chaotic Systems Kazumasa A. Takeuchi,1, that the collective dynamics of large chaotic systems is encoded in their Lyapunov spectra: most modes are typically numbers: 05.45.Ŕa, 05.70.Ln, 05.90.+m A common way of characterizing chaos is to measure Lyapunov
A Formal Framework for Modeling and Analysis of System-Level Dynamic Power Management
Ha, Dong S.
A Formal Framework for Modeling and Analysis of System-Level Dynamic Power Management Shrirang, tlmartin, ha}@vt.edu Abstract Recent advances in Dynamic Power Management (DPM) tech- niques have resulted in designs that support a rich set of power management options, both at the hardware and software levels
Dynamic Fracture Conductivity—An Experimental Investigation Based on Factorial Analysis
Awoleke, Obadare O
2013-01-31T23:59:59.000Z
on these factors. We dynamically placed the slurry hereby simulating the slurry placement procedure in a field-scale fracture. We also used factorial and fractional factorial designs as the basis of our experimental investigation. The analysis and interpretation...
Comparison of Dynamic Data Analysis Methods for Thermal Property Measurement of a Building Wall
Huang, K.; Gong, Y.
2006-01-01T23:59:59.000Z
results more accurate. In this paper, two methods for analyzing the building wall's thermal transmittance, where data is measured on site, are presented. They are respectively called the dynamic analysis method and the system identification method. The two...
Graham, G A; Teslich, N E; Kearsley, A T; Stadermann, F J; Stroud, R M; Dai, Z R; Ishii, H A; Hutcheon, I D; Bajt, S; Snead, C J; Weber, P K; Bradley, J P
2007-02-20T23:59:59.000Z
Sample preparation is always a critical step in study of micrometer sized astromaterials available for study in the laboratory, whether their subsequent analysis is by electron microscopy or secondary ion mass spectrometry. A focused beam of gallium ions has been used to prepare electron transparent sections from an interplanetary dust particle, as part of an integrated analysis protocol to maximize the mineralogical, elemental, isotopic and spectroscopic information extracted from one individual particle. In addition, focused ion beam techniques have been employed to extract cometary residue preserved on the rims and walls of micro-craters in 1100 series aluminum foils that were wrapped around the sample tray assembly on the Stardust cometary sample collector. Non-ideal surface geometries and inconveniently located regions of interest required creative solutions. These include support pillar construction and relocation of a significant portion of sample to access a region of interest. Serial sectioning, in a manner similar to ultramicrotomy, is a significant development and further demonstrates the unique capabilities of focused ion beam microscopy for sample preparation of astromaterials.
Baer, Roi
applied to hydrogen on nickel Roi Baer and Ronnie Kosloff Department of Physical Chemistry and the Fritz on nickel were studied. In the bulk the line shape is mostly influenced by nonadiabatic effects on nickel. A distinction between lattice modes that enhance the tunneling and ones that suppress
Performance analysis of synchronous machines under dynamic eccentricity
Al-Nuaim, Nabil Abdulaziz
1996-01-01T23:59:59.000Z
The performance of salient pole synchronous machines under eccentric rotors is studied. Relationships between stator and rotor current induced harmonics and dynamic eccentricity are investigated. The winding function theory has been modified...
Dynamic analysis of a 5 megawatt offshore floating wind turbine
Harriger, Evan Michael
2011-01-01T23:59:59.000Z
Modeling the Dynamics of a Spar-type Floating Offshore Windcable coefficients for the spar buoy design. The wave-bodygeometry of the structure. The spar buoy has a hydrostatic
AN ANALYSIS OF STATIC, DYNAMIC, AND APPARENT MOTION VIBROTACTILE STIMULI
Roady, William
2012-04-27T23:59:59.000Z
or multiple locations vibrating at once), non-overlapping dynamic sequences of presentations, and saltatory presentations which induce the “apparent motion” tactile illusion; each at increasing levels of signal complexity and presentation duration...
Performance analysis of synchronous machines under dynamic eccentricity
Al-Nuaim, Nabil Abdulaziz
1996-01-01T23:59:59.000Z
The performance of salient pole synchronous machines under eccentric rotors is studied. Relationships between stator and rotor current induced harmonics and dynamic eccentricity are investigated. The winding function theory has been modified...
Carbon flow and ecosystem dynamics in the Mississippi River plume described by inverse analysis
Breed, Greg Allen
2002-01-01T23:59:59.000Z
for the degree of MASTER OF SCIENCE December 2002 Major Subject: Oceanography CARBON FLOW AND ECOSYSTEM DYNAMICS IN THE MISSISSIPPI RIVER PLUME DESCRIBED BY INVERSE ANALYSIS A Thesis by GREG ALLEN BREED Submitted to Texas A&M University in partial... of Department) December 2002 Major Sublect: Oceanography ABSTRACT Carbon Flow and Ecosystem Dynamics in the Mississippi River Plume Described by Inverse Analysis. (December 2002) Greg Allen Breed, B. S. , University of Minnesota Chair of Advisory...
Bustamante, David Anthony
1992-01-01T23:59:59.000Z
CONVERGENCE OF PENALTY AND AUGMENTED LAGRANGIAN FORMULATIONS IN THE DYNAMIC ANALYSIS OF NONLINEAR MULTIBODY SYSTEMS A Thesis DAVID ANTHONY BUSTAMANTE Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment... of the requirements for the degree of ~R OF SCIENCE December 1992 Major Subject: Aerospace Engineering CONVERGENCE OF PENALTY AND AUGMENTED LAGRANGIAN FORMULATIONS IN THE DYNAMIC ANALYSIS OF NONLINEAR MULTIBODY SYSTEMS A Thesis by DAVID ANTHONY BUSTAMANTE...
De Santo, Robert James William
1972-01-01T23:59:59.000Z
A DYNAMIC STABILITY ANALYSIS OF AN AIRCRAFT PASSING THROUGH THE TRAILING VORTICES OF ANOTHER AIRCRAFT A Thesi~ x ROBERT J. MAE SANTO, JR. Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE December 1972 Major Subject: Aerospace Engineering A DYNAMIC STABILITY ANALYSIS OF AN AIRCRAFT PASSING THROUGH THE TRAILING VORTICES OF ANOTHER AIRCRAFT A Thesis by ROBERT J. W. DE SANTO) JR. Approved as to style...
Chi, K C; Reiner, David; Nuttall, William J
www.eprg.group.cam.ac.uk E P R G W O R K IN G P A P E R N O N -T E C H N IC A L S U M M A R Y DYNAMICS OF THE UK NATURAL GAS INDUSTRY: SYSTEM DYNAMICS MODELLING AND LONG-TERM ENERGY POLICY ANALYSIS EPRG Working Paper 0913... Cambridge Working Paper in Economics 0922 Kong Chyong Chi , David M. Reiner and William J. Nuttall The UK offshore natural gas and oil industry has a long and successful history and has been said to represent the pride of UK...
Tronci, Enrico
, Italy 1 ADVANCED TECHNIQUES FOR SAFETY ANALYSIS APPLIED TO THE GAS TURBINE CONTROL SYSTEM OF ICARO CO of complex computer based systems. Such approaches are applied to the gas turbine control system of ICARO co of the centre of ENEA CR Casaccia. The plant is based on a small gas turbine and has been specifically designed
Paris-Sud XI, Université de
Devineau et al 1 Applied Clay Science, 2006, 31, 76-84 In situ neutron diffraction analysis 2 Applied Clay Science, 2006, 31, 76-84 Abstract The swelling properties of a bentonite MX-80 in constrained pellets deviates from that observed for free pellets. Reorientation phenomena of clay layers were
Review of Methods of Power-Spectrum Analysis as Applied to Super-Kamiokande Solar Neutrino Data
P. A. Sturrock
2004-08-02T23:59:59.000Z
To help understand why different published analyses of the Super-Kamiokande solar neutrino data arrive at different conclusions, we have applied six different methods to a standardized problem. The key difference between the various methods rests in the amount of information that each processes. A Lomb-Scargle analysis that uses the mid times of the time bins and ignores experimental error estimates uses the least information. A likelihood analysis that uses the start times, end times, and mean live times, and takes account of the experimental error estimates, makes the greatest use of the available information. We carry out power-spectrum analyses of the Super-Kamiokande 5-day solar neutrino data, using each method in turn, for a standard search band (0 to 50 yr-1). For each method, we also carry out a fixed number (10,000) of Monte-Carlo simulations for the purpose of estimating the significance of the leading peak in each power spectrum. We find that, with one exception, the results of these calculations are compatible with those of previously published analyses. (We are unable to replicate Koshio's recent results.) We find that the significance of the peaks at 9.43 yr-1 and at 43.72 yr-1 increases progressively as one incorporates more information into the analysis procedure.
KINEMATIC AND DYNAMIC ANALYSIS OF A SPATIAL ONE-DOF FOLDABLE TENSEGRITY MECHANISM
Hayes, John
KINEMATIC AND DYNAMIC ANALYSIS OF A SPATIAL ONE-DOF FOLDABLE TENSEGRITY MECHANISM M. A. Swartz1 , M analysis of a spatial 1-DOF tensegrity mechanism created by connecting three planar tensegrity mechanisms: tensegrity; foldable mechanisms; deployable mechanisms; kinematic model; dy- namic model. ANALYSE M ´ECANIQUE
Analysis of Dynamic Task Allocation in Multi-Robot Systems
Lerman, Kristina
coordination algorithms difficult to design. In this paper we present a mathematical model of a general dynamic) has greatly benefited from the formalisms provided by control theory the design of MRS is in need task to choose based on these observations. We model the robots and observa- tions as stochastic
STABILITY ANALYSIS OF INTERCONNECTED POWER SYSTEMS COUPLED WITH MARKET DYNAMICS
through numeric tests using various mar- ket update models, with detailed generator/turbine response of the generator/network dynamics. Therefore, under the assumption of market-based dis- patch between the dy- namics of markets determining the generator dispatch com- mands, and the physical response
Lurking Pathway Prediction And Pathway ODE Model Dynamic Analysis
Zhang, Rengjing
2013-11-18T23:59:59.000Z
Signaling pathway analysis is so important to study the causes of diseases and the treatment of drugs. Finding the lurking pathway from ligand to signature is a significant issue in studying the mechanism of how the cell response...
An Analysis Tool for Flight Dynamics Monte Carlo Simulations
Restrepo, Carolina 1982-
2011-05-20T23:59:59.000Z
and analysis work to understand vehicle operating limits and identify circumstances that lead to mission failure. A Monte Carlo simulation approach that varies a wide range of physical parameters is typically used to generate thousands of test cases...
Characteristics of identifying linear dynamic models from impulse response data using Prony analysis
Trudnowski, D.J.
1992-12-01T23:59:59.000Z
The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done using two basic approaches: model the system using theoretical derivations and some linearization method such as a Taylor series expansion; or use a curve-fitting technique to optimally fit a linear model to specified system response data. Prony analysis belongs to the second class of system modeling because it is a method of fitting a linear model to the impulse response of a dynamic system. Its parallel formulation inherently makes it well suited for fitting models to oscillatory system data. Such oscillatory dynamic effects occur in large synchronous-generator-based power systems in the form of electromechanical oscillations. To study and characterize these oscillatory dynamics, BPA has developed computer codes to analyze system data using Prony analysis. The objective of this study was to develop a highly detailed understanding of the properties of using Prony analysis to fit models to systems with characteristics often encountered in power systems. This understanding was then extended to develop general ``rules-of-thumb`` for using Prony analysis. The general characteristics were investigated by performing fits to data from known linear models under controlled conditions. The conditions studied include various mathematical solution techniques; different parent system configurations; and a large variety of underlying noise characteristics.
Characteristics of identifying linear dynamic models from impulse response data using Prony analysis
Trudnowski, D.J.
1992-12-01T23:59:59.000Z
The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done using two basic approaches: model the system using theoretical derivations and some linearization method such as a Taylor series expansion; or use a curve-fitting technique to optimally fit a linear model to specified system response data. Prony analysis belongs to the second class of system modeling because it is a method of fitting a linear model to the impulse response of a dynamic system. Its parallel formulation inherently makes it well suited for fitting models to oscillatory system data. Such oscillatory dynamic effects occur in large synchronous-generator-based power systems in the form of electromechanical oscillations. To study and characterize these oscillatory dynamics, BPA has developed computer codes to analyze system data using Prony analysis. The objective of this study was to develop a highly detailed understanding of the properties of using Prony analysis to fit models to systems with characteristics often encountered in power systems. This understanding was then extended to develop general rules-of-thumb'' for using Prony analysis. The general characteristics were investigated by performing fits to data from known linear models under controlled conditions. The conditions studied include various mathematical solution techniques; different parent system configurations; and a large variety of underlying noise characteristics.
Parametric study and dynamic analysis of compliant piled towers
Moog, Karl Heinz
1990-01-01T23:59:59.000Z
the Tower. . . . . . . . . . Vl. g Shear Force and Overturning Moment 65 GG 69 75 79 83 84 90 VII CONC'LUSIONS . F(EFERENC'ES . l 02 APPENDIX A 5IODE SHAPES 104 P a. ge APPENDIX A MODE SHAPES 104 APPENDIX B DYNAMIC RESPONSE FOR A SINGLE WAVE..., 3q, " Kgss = Gl, 5 CW, Kgss? 10 4C'W, l, p, " lr ? CIV, I, qr" ls 30 60 6C'W; 33i" Kgss = + 5l, 5 ? CW, It g 5 s 10 ? CW; pr" l, 10 10 4CW;I, 30 10 (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) In order to represent...
Dynamic Systems Analysis Report for Nuclear Fuel Recycle
Brent Dixon; Sonny Kim; David Shropshire; Steven Piet; Gretchen Matthern; Bill Halsey
2008-12-01T23:59:59.000Z
This report examines the time-dependent dynamics of transitioning from the current United States (U.S.) nuclear fuel cycle where used nuclear fuel is disposed in a repository to a closed fuel cycle where the used fuel is recycled and only fission products and waste are disposed. The report is intended to help inform policy developers, decision makers, and program managers of system-level options and constraints as they guide the formulation and implementation of advanced fuel cycle development and demonstration efforts and move toward deployment of nuclear fuel recycling infrastructure.
Dynamical Analysis of Scalar Field Cosmologies with Spatial Curvature
Mateja Gosenca; Peter Coles
2015-02-13T23:59:59.000Z
We explore the dynamical behaviour of cosmological models involving a scalar field (with an exponential potential and a canonical kinetic term) and a matter fluid with spatial curvature included in the equations of motion. Using appropriately defined parameters to describe the evolution of the scalar field energy in this situation, we find that there are two extra fixed points that are not present in the case without curvature. We also analyse the evolution of the effective equation-of-state parameter for different initial values of the curvature.
Analysis of forward and inverse problems in chemical dynamics and spectroscopy
Rabitz, H. [Princeton Univ., NJ (United States)
1993-12-01T23:59:59.000Z
The overall scope of this research concerns the development and application of forward and inverse analysis tools for problems in chemical dynamics and chemical kinetics. The chemical dynamics work is specifically associated with relating features in potential surfaces and resultant dynamical behavior. The analogous inverse research aims to provide stable algorithms for extracting potential surfaces from laboratory data. In the case of chemical kinetics, the focus is on the development of systematic means to reduce the complexity of chemical kinetic models. Recent progress in these directions is summarized below.
Applications of recurrence quantified analysis to study the dynamics of chaotic chemical reaction
H. Castellini; L. Romanelli
2002-11-28T23:59:59.000Z
Recurrence plot is a quite easy tool to be used in time series analysis,in particular for measuring unstable periodic orbits embedded in a chaotic dynamical system. Recurrence quantified analysis (RQA) is an advance tool that allows the study of intrinsic complexity of dynamical system with a set of few parameters. We use RQA for measuring chaotic transitions of NADH chemical reaction and determine numerically its characteristic parameters such as: Correlation integral, information entropy, Maximal Lyapunov's exponent, etc. For this work we have developed command sets with performance better than TISEAN package
Ng, Chi Kin
1978-01-01T23:59:59.000Z
DYNAMIC ANALYSIS OF SHELLS OF REVOLUTION SUBMERGED IN AN ACOUSTIC MEDIUM BY THE FINITE ELEMENT METHOD A Thesis by CHI KIN NG Submitted to the Graduate College of Texas AiIH University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE May 1978 Major Subject: Civil Engineering DYNAMIC ANALYSIS OF SHELLS OF REVOLUTION SUBMERGED IN AN ACOUSTIC MEDIUM BY THE FINITE ELEMENT METHOD A Thesis by CHI KIN NG Approved as to style and content by: Chf fC i'~t ( 8 ('i...
Dombroski, M; Melius, C; Edmunds, T; Banks, L E; Bates, T; Wheeler, R
2008-09-24T23:59:59.000Z
This study uses the Multi-scale Epidemiologic Simulation and Analysis (MESA) system developed for foreign animal diseases to assess consequences of nationwide human infectious disease outbreaks. A literature review identified the state of the art in both small-scale regional models and large-scale nationwide models and characterized key aspects of a nationwide epidemiological model. The MESA system offers computational advantages over existing epidemiological models and enables a broader array of stochastic analyses of model runs to be conducted because of those computational advantages. However, it has only been demonstrated on foreign animal diseases. This paper applied the MESA modeling methodology to human epidemiology. The methodology divided 2000 US Census data at the census tract level into school-bound children, work-bound workers, elderly, and stay at home individuals. The model simulated mixing among these groups by incorporating schools, workplaces, households, and long-distance travel via airports. A baseline scenario with fixed input parameters was run for a nationwide influenza outbreak using relatively simple social distancing countermeasures. Analysis from the baseline scenario showed one of three possible results: (1) the outbreak burned itself out before it had a chance to spread regionally, (2) the outbreak spread regionally and lasted a relatively long time, although constrained geography enabled it to eventually be contained without affecting a disproportionately large number of people, or (3) the outbreak spread through air travel and lasted a long time with unconstrained geography, becoming a nationwide pandemic. These results are consistent with empirical influenza outbreak data. The results showed that simply scaling up a regional small-scale model is unlikely to account for all the complex variables and their interactions involved in a nationwide outbreak. There are several limitations of the methodology that should be explored in future work including validating the model against reliable historical disease data, improving contact rates, spread methods, and disease parameters through discussions with epidemiological experts, and incorporating realistic behavioral assumptions.
Photoionization analysis of chemo-dynamical dwarf galaxies simulations
Melekh, B; Hensler, G; Buhajenko, O
2015-01-01T23:59:59.000Z
Photoionization modelling allows to follow the transport, the emergence, and the absorption of photons taking into account all important processes in nebular plasmas. Such modelling needs the spatial distribution of density, chemical abundances and temperature, that can be provided by chemo-dynamical simulations (ChDS) of dwarf galaxies. We perform multicomponent photoionization modelling (MPhM) of the ionized gas using 2-D ChDSs of dwarf galaxies. We calculate emissivity maps for important nebular emission lines. Their intensities are used to derive the chemical abundance of oxygen by the so-called Te- and R23-methods. Some disagreements are found between oxygen abundances calculated with these methods and the ones coming from the ChDSs. We investigate the fraction of ionizing radiation emitted in the star-forming region which is able to leak out the galaxy. The time- and direction-averaged escape fraction in our simulation is 0.35-0.4. Finally, we have calculated the total Halpha lumi- nosity of our model g...
Computational Fluid Dynamics Analysis of Flexible Duct Junction Box Design
Beach, R.; Prahl, D.; Lange, R.
2013-12-01T23:59:59.000Z
IBACOS explored the relationships between pressure and physical configurations of flexible duct junction boxes by using computational fluid dynamics (CFD) simulations to predict individual box parameters and total system pressure, thereby ensuring improved HVAC performance. Current Air Conditioning Contractors of America (ACCA) guidance (Group 11, Appendix 3, ACCA Manual D, Rutkowski 2009) allows for unconstrained variation in the number of takeoffs, box sizes, and takeoff locations. The only variables currently used in selecting an equivalent length (EL) are velocity of air in the duct and friction rate, given the first takeoff is located at least twice its diameter away from the inlet. This condition does not account for other factors impacting pressure loss across these types of fittings. For each simulation, the IBACOS team converted pressure loss within a box to an EL to compare variation in ACCA Manual D guidance to the simulated variation. IBACOS chose cases to represent flows reasonably correlating to flows typically encountered in the field and analyzed differences in total pressure due to increases in number and location of takeoffs, box dimensions, and velocity of air, and whether an entrance fitting is included. The team also calculated additional balancing losses for all cases due to discrepancies between intended outlet flows and natural flow splits created by the fitting. In certain asymmetrical cases, the balancing losses were significantly higher than symmetrical cases where the natural splits were close to the targets. Thus, IBACOS has shown additional design constraints that can ensure better system performance.
A cracked beam finite element for rotating shaft dynamics and stability analysis
Paris-Sud XI, Université de
A cracked beam finite element for rotating shaft dynamics and stability analysis Saber El Arem Palaiseau, France Abstract In this paper, a method for the construction of a cracked beam finite element is presented. The additional flexibility due to the cracks is identified from three- dimensional finite element
IEEE TRANSACTIONS ON POWER SYSTEMS Stochastic Analysis of Cascading-Failure Dynamics
Hayat, Majeed M.
IEEE TRANSACTIONS ON POWER SYSTEMS Stochastic Analysis of Cascading-Failure Dynamics in Power Grids of the system. Cas- cading failures in power grids can be described as successive changes of power-grid states system state during cascading failures may not be feasible. This is mainly due the large space of power
Shen, Jinglai
DYNAMIC SECURITY ANALYSIS OF ELECTRIC POWER SYSTEMS: PASSIVITY-BASED APPROACH AND POSITIVE in modern power system opera- tion. With the aid of analytic tools for large-scale and hybrid systems, this paper proposes two new safety verification methods for power systems. The first method is based
Detection of Tumors in Dynamic Magnetic Resonance Images using Principal Component Analysis
Detection of Tumors in Dynamic Magnetic Resonance Images using Principal Component Analysis David Alberg Holm (1-2), Thomas BĂ¸vith (2), Cecilia Cappellin (3) (1) Danish Research Centre for Magnetic different tissue classes. For this purpose, two methods were developed and combined. Data Eight mice bearing
Get Online Support, Feel Better--Sentiment Analysis and Dynamics in an Online Cancer
] from cancer and cancer treatments. Each year, many people turn to the Internet to satisfy their health offers a way to share experiences about their cancer and cancer treatment, seek solutions to daily livingGet Online Support, Feel Better--Sentiment Analysis and Dynamics in an Online Cancer Survivor
Get Online Support, Feel Better--Sentiment Analysis and Dynamics in an Online Cancer
Giles, C. Lee
] from cancer and cancer treatments. Each year, many people turn to the Internet to satisfy their health to share experiences about their cancer and cancer treatment, seek solutions to daily living issuesGet Online Support, Feel Better--Sentiment Analysis and Dynamics in an Online Cancer Survivor
Synthesis Tools for Structural Dynamics and Partitioned Analysis of Coupled Systems
Felippa, Carlos A.
. Synthesis Tools for Structural Dynamics and Partitioned Analysis of Coupled Systems C. A. Felippa and K. C. Park Department of Aerospace Engineering Sciences and Center for Aerospace Structures and K. C. Park domain. It can only show that a model works. A "bridging" tool between human analytics
Self-consistent analysis of the hot spot dynamics for inertial confinement fusion capsules
Garnier, Josselin
Self-consistent analysis of the hot spot dynamics for inertial confinement fusion capsules J. Sanz Hydrodynamic stability of inertial confinement fusion ICF capsules during the deceleration stage has been re October 2005; published online 11 November 2005 In the context of the French Laser-Mégajoule fusion
Dynamic Hybrid Clustering of Bioinformatics by Incorporating Text Mining and Citation Analysis
Dynamic Hybrid Clustering of Bioinformatics by Incorporating Text Mining and Citation Analysis-3001 Leuven (Belgium) frizo.janssens@esat.kuleuven.be Wolfgang Glänzel Steunpunt O&O Indicatoren Katholieke Universiteit Leuven Dekenstraat 2 B-3000 Leuven (Belgium) wolfgang.glanzel@econ.kuleuven.be Bart
Short-term earthquake prediction by reverse analysis of lithosphere dynamics
Gabrielov, Andrei
Short-term earthquake prediction by reverse analysis of lithosphere dynamics P. Shebalin a,d , V for Earthquake Prediction Theory and Mathematical Geophysics, Russian Ac. Sci., Warshavskoe sh., 79, korp. 2 13 December 2005 Abstract Short-term earthquake prediction, months in advance, is an elusive goal
Bone Motion Analysis From Dynamic MRI: Ac-quisition and Tracking
Gilles, Benjamin
of mechanical overload, impingement or femoral head instability. For both diagnosis and surgical planning, an acBone Motion Analysis From Dynamic MRI: Ac- quisition and Tracking INTRODUCTION Periacetabular- curate estimate of hip joint bone motion is required. Orthopedists can use animated 3D models, prior
Analysis of a Darcy flow model with a dynamic pressure saturation relation \\Lambda
Hulshof, Joost
equations modelling the flow. In the standard approach for two phase flows, such as oilwater or airwater mixtures, one combines the mass conservation equations and Darcy's law for the separate phasesAnalysis of a Darcy flow model with a dynamic pressure saturation relation \\Lambda Josephus Hulshof
Automated Migration of Build Scripts using Dynamic Analysis and Search-Based Refactoring
Rajamani, Sriram K.
Automated Migration of Build Scripts using Dynamic Analysis and Search-Based Refactoring Milos, there is insufficient support for automated migration of build scripts, making the migration more problematic. We@illinois.edu, {schulte, chandrap, dannyvv, iman.narasamdya, livshits}@microsoft.com Abstract The efficiency of a build
Analysis of Dynamic Power Management on Multi-Core W. Lloyd Bircher and Lizy K. John
John, Lizy Kurian
Analysis of Dynamic Power Management on Multi-Core Processors W. Lloyd Bircher and Lizy K. John of Texas at Austin {bircher, ljohn}@ece.utexas.edu ABSTRACT Power management of multi-core processors management according to ACPI (Advanced Power and Configurations Interface) specifications is the common
Phase Field Dynamic Modelling of Shape Memory Alloys Based on Isogeometric Analysis
Gomez, Hector
Phase Field Dynamic Modelling of Shape Memory Alloys Based on Isogeometric Analysis Rakesh Dhote1 transformations, phase-field model, Ginzburg-Landau theory, nonlinear thermo-elasticity. Abstract. Shape Memory. Introduction Shape Memory Alloys have attracted considerable attention of physicists, engineers and mathemati
A Dynamical Systems Analysis of the Data Assimilation Linked Ecosystem Carbon (DALEC) Models
Skeldon, Anne C.
A Dynamical Systems Analysis of the Data Assimilation Linked Ecosystem Carbon (DALEC) Models Anna M make it ever more important to understand the processes involved in Earth systems, such as the carbon with it the ability to perform ever- more detailed studies of the Earth system and its components. Such studies help
Diana K. Grauer; Michael E. Reed
2011-11-01T23:59:59.000Z
This paper presents an investigation into integrated wind + combustion engine high penetration electrical generation systems. Renewable generation systems are now a reality of electrical transmission. Unfortunately, many of these renewable energy supplies are stochastic and highly dynamic. Conversely, the existing national grid has been designed for steady state operation. The research team has developed an algorithm to investigate the feasibility and relative capability of a reciprocating internal combustion engine to directly integrate with wind generation in a tightly coupled Hybrid Energy System. Utilizing the Idaho National Laboratory developed Phoenix Model Integration Platform, the research team has coupled demand data with wind turbine generation data and the Aspen Custom Modeler reciprocating engine electrical generator model to investigate the capability of reciprocating engine electrical generation to balance stochastic renewable energy.
AIR INGRESS ANALYSIS: PART 2 – COMPUTATIONAL FLUID DYNAMIC MODELS
Chang H. Oh; Eung S. Kim; Richard Schultz; Hans Gougar; David Petti; Hyung S. Kang
2011-01-01T23:59:59.000Z
The Idaho National Laboratory (INL), under the auspices of the U.S. Department of Energy, is performing research and development that focuses on key phenomena important during potential scenarios that may occur in very high temperature reactors (VHTRs). Phenomena Identification and Ranking Studies to date have ranked an air ingress event, following on the heels of a VHTR depressurization, as important with regard to core safety. Consequently, the development of advanced air ingress-related models and verification and validation data are a very high priority. Following a loss of coolant and system depressurization incident, air will enter the core of the High Temperature Gas Cooled Reactor through the break, possibly causing oxidation of the in-the core and reflector graphite structure. Simple core and plant models indicate that, under certain circumstances, the oxidation may proceed at an elevated rate with additional heat generated from the oxidation reaction itself. Under postulated conditions of fluid flow and temperature, excessive degradation of the lower plenum graphite can lead to a loss of structural support. Excessive oxidation of core graphite can also lead to the release of fission products into the confinement, which could be detrimental to a reactor safety. Computational fluid dynamic model developed in this study will improve our understanding of this phenomenon. This paper presents two-dimensional and three-dimensional CFD results for the quantitative assessment of the air ingress phenomena. A portion of results of the density-driven stratified flow in the inlet pipe will be compared with results of the experimental results.
Dynamic multiplexed analysis method using ion mobility spectrometer
Belov, Mikhail E [Richland, WA
2010-05-18T23:59:59.000Z
A method for multiplexed analysis using ion mobility spectrometer in which the effectiveness and efficiency of the multiplexed method is optimized by automatically adjusting rates of passage of analyte materials through an IMS drift tube during operation of the system. This automatic adjustment is performed by the IMS instrument itself after determining the appropriate levels of adjustment according to the method of the present invention. In one example, the adjustment of the rates of passage for these materials is determined by quantifying the total number of analyte molecules delivered to the ion trap in a preselected period of time, comparing this number to the charge capacity of the ion trap, selecting a gate opening sequence; and implementing the selected gate opening sequence to obtain a preselected rate of analytes within said IMS drift tube.
SU-E-J-261: Statistical Analysis and Chaotic Dynamics of Respiratory Signal of Patients in BodyFix
Michalski, D; Huq, M; Bednarz, G; Lalonde, R; Yang, Y; Heron, D [University of Pittsburgh Medical Center, Pittsburgh, PA (United States)
2014-06-01T23:59:59.000Z
Purpose: To quantify respiratory signal of patients in BodyFix undergoing 4DCT scan with and without immobilization cover. Methods: 20 pairs of respiratory tracks recorded with RPM system during 4DCT scan were analyzed. Descriptive statistic was applied to selected parameters of exhale-inhale decomposition. Standardized signals were used with the delay method to build orbits in embedded space. Nonlinear behavior was tested with surrogate data. Sample entropy SE, Lempel-Ziv complexity LZC and the largest Lyapunov exponents LLE were compared. Results: Statistical tests show difference between scans for inspiration time and its variability, which is bigger for scans without cover. The same is for variability of the end of exhalation and inhalation. Other parameters fail to show the difference. For both scans respiratory signals show determinism and nonlinear stationarity. Statistical test on surrogate data reveals their nonlinearity. LLEs show signals chaotic nature and its correlation with breathing period and its embedding delay time. SE, LZC and LLE measure respiratory signal complexity. Nonlinear characteristics do not differ between scans. Conclusion: Contrary to expectation cover applied to patients in BodyFix appears to have limited effect on signal parameters. Analysis based on trajectories of delay vectors shows respiratory system nonlinear character and its sensitive dependence on initial conditions. Reproducibility of respiratory signal can be evaluated with measures of signal complexity and its predictability window. Longer respiratory period is conducive for signal reproducibility as shown by these gauges. Statistical independence of the exhale and inhale times is also supported by the magnitude of LLE. The nonlinear parameters seem more appropriate to gauge respiratory signal complexity since its deterministic chaotic nature. It contrasts with measures based on harmonic analysis that are blind for nonlinear features. Dynamics of breathing, so crucial for 4D-based clinical technologies, can be better controlled if nonlinear-based methodology, which reflects respiration characteristic, is applied. Funding provided by Varian Medical Systems via Investigator Initiated Research Project.
Kon, Mark
Review of Wavelet Theory and Harmonic Analysis in Applied Sciences, C.E. D'Atellis and E.M. Fernandez-Berdaguer, Ed. Mark A. Kon, Boston University Wavelet theory has had a far-reaching influence, not only on the theory of wavelets, but on their applications in almost every area of science which has
Maryland, Baltimore County, University of
and Applied Linear Algebra by Carl D. Meyer, SIAM, 2000. Emphasis is on general theory of matrices rather than
Dynamical system analysis for DBI dark energy interacting with dark matter
Nilanjana Mahata; Subenoy Chakraborty
2015-01-19T23:59:59.000Z
A dynamical system analysis related to Dirac Born Infeld (DBI) cosmological model has been investigated in this present work. For spatially flat FRW space time, the Einstein field equation for DBI scenario has been used to study the dynamics of DBI dark energy interacting with dark matter. The DBI dark energy model is considered as a scalar field with a nonstandard kinetic energy term. An interaction between the DBI dark energy and dark matter is considered through a phenomenological interaction between DBI scalar field and the dark matter fluid. The field equations are reduced to an autonomous dynamical system by a suitable redefinition of the basic variables. The potential of the DBI scalar field is assumed to be exponential. Finally, critical points are determined, their nature have been analyzed and corresponding cosmological scenario has been discussed.
Gregor Tanner
2008-03-12T23:59:59.000Z
We propose a new approach towards determining the distribution of mechanical and acoustic wave energy in complex built-up structures. The technique interpolates between standard Statistical Energy Analysis (SEA) and full ray tracing containing both these methods as limiting case. By writing the flow of ray trajectories in terms of linear phase space operators, it is suggested here to reformulate ray-tracing algorithms in terms of boundary operators containing only short ray segments. SEA can now be identified as a low resolution ray tracing algorithm and typical SEA assumptions can be quantified in terms of the properties of the ray dynamics. The new technique presented here enhances the range of applicability of standard SEA considerably by systematically incorporating dynamical correlations wherever necessary. Some of the inefficiencies inherent in typical ray tracing methods can be avoided using only a limited amount of the geometrical ray information. The new dynamical theory - Dynamical Energy Analysis (DEA) - thus provides a universal approach towards determining wave energy distributions in complex structures.
The dynamic of information-driven coordination phenomena: a transfer entropy analysis
Borge-Holthoefer, Javier; Gonçalves, Bruno; González-Bailón, Sandra; Arenas, Alex; Moreno, Yamir; Vespignani, Alessandro
2015-01-01T23:59:59.000Z
Data from social media are providing unprecedented opportunities to investigate the processes that rule the dynamics of collective social phenomena. Here, we consider an information theoretical approach to define and measure the temporal and structural signatures typical of collective social events as they arise and gain prominence. We use the symbolic transfer entropy analysis of micro-blogging time series to extract directed networks of influence among geolocalized sub-units in social systems. This methodology captures the emergence of system-level dynamics close to the onset of socially relevant collective phenomena. The framework is validated against a detailed empirical analysis of five case studies. In particular, we identify a change in the characteristic time-scale of the information transfer that flags the onset of information-driven collective phenomena. Furthermore, our approach identifies an order-disorder transition in the directed network of influence between social sub-units. In the absence of ...
General purpose dynamic Monte Carlo with continuous energy for transient analysis
Sjenitzer, B. L.; Hoogenboom, J. E. [Delft Univ. of Technology, Dept. of Radiation, Radionuclide and Reactors, Mekelweg 15, 2629JB Delft (Netherlands)
2012-07-01T23:59:59.000Z
For safety assessments transient analysis is an important tool. It can predict maximum temperatures during regular reactor operation or during an accident scenario. Despite the fact that this kind of analysis is very important, the state of the art still uses rather crude methods, like diffusion theory and point-kinetics. For reference calculations it is preferable to use the Monte Carlo method. In this paper the dynamic Monte Carlo method is implemented in the general purpose Monte Carlo code Tripoli4. Also, the method is extended for use with continuous energy. The first results of Dynamic Tripoli demonstrate that this kind of calculation is indeed accurate and the results are achieved in a reasonable amount of time. With the method implemented in Tripoli it is now possible to do an exact transient calculation in arbitrary geometry. (authors)
A dynamic fuel cycle analysis for a heterogeneous thorium-DUPIC recycle in CANDU reactors
Jeong, C. J.; Park, C. J.; Choi, H. [Korea Atomic Energy Research Inst., P.O. Box 150, Yuseong, Daejeon, 305-600 (Korea, Republic of)
2006-07-01T23:59:59.000Z
A heterogeneous thorium fuel recycle scenario in a Canada deuterium uranium (CANDU) reactor has been analyzed by the dynamic analysis method. The thorium recycling is performed through a dry process which has a strong proliferation resistance. In the fuel cycle model, the existing nuclear power plant construction plan was considered up to 2016, while the nuclear demand growth rate from the year 2016 was assumed to be 0%. In this analysis, the spent fuel inventory as well as the amount of plutonium, minor actinides, and fission products of a multiple thorium recycling fuel cycle were estimated and compared to those of the once-through fuel cycle. The analysis results have shown that the heterogeneous thorium fuel cycle can be constructed through the dry process technology. It is also shown that the heterogeneous thorium fuel cycle can reduce the spent fuel inventory and save on the natural uranium resources when compared with the once-through cycle. (authors)
Madduri, Kamesh; Bader, David A.
2009-02-15T23:59:59.000Z
Graph-theoretic abstractions are extensively used to analyze massive data sets. Temporal data streams from socioeconomic interactions, social networking web sites, communication traffic, and scientific computing can be intuitively modeled as graphs. We present the first study of novel high-performance combinatorial techniques for analyzing large-scale information networks, encapsulating dynamic interaction data in the order of billions of entities. We present new data structures to represent dynamic interaction networks, and discuss algorithms for processing parallel insertions and deletions of edges in small-world networks. With these new approaches, we achieve an average performance rate of 25 million structural updates per second and a parallel speedup of nearly28 on a 64-way Sun UltraSPARC T2 multicore processor, for insertions and deletions to a small-world network of 33.5 million vertices and 268 million edges. We also design parallel implementations of fundamental dynamic graph kernels related to connectivity and centrality queries. Our implementations are freely distributed as part of the open-source SNAP (Small-world Network Analysis and Partitioning) complex network analysis framework.
Computational Fluid Dynamic Analysis of the VHTR Lower Plenum Standard Problem
Richard W. Johnson; Richard R. Schultz
2009-07-01T23:59:59.000Z
The United States Department of Energy is promoting the resurgence of nuclear power in the U. S. for both electrical power generation and production of process heat required for industrial processes such as the manufacture of hydrogen for use as a fuel in automobiles. The DOE project is called the next generation nuclear plant (NGNP) and is based on a Generation IV reactor concept called the very high temperature reactor (VHTR), which will use helium as the coolant at temperatures ranging from 450 şC to perhaps 1000 şC. While computational fluid dynamics (CFD) has not been used for past safety analysis for nuclear reactors in the U. S., it is being considered for safety analysis for existing and future reactors. It is fully recognized that CFD simulation codes will have to be validated for flow physics reasonably close to actual fluid dynamic conditions expected in normal and accident operational situations. To this end, experimental data have been obtained in a scaled model of a narrow slice of the lower plenum of a prismatic VHTR. The present report presents results of CFD examinations of these data to explore potential issues with the geometry, the initial conditions, the flow dynamics and the data needed to fully specify the inlet and boundary conditions; results for several turbulence models are examined. Issues are addressed and recommendations about the data are made.
Modelling and Dynamic Simulation for Process Control
Skogestad, Sigurd
principles for model development are outlined, and these principles are applied to a simple ash tank (which. In this paper we consider dynamic process models obtained using fundamental principles (eg. based reactor, a simple trend analysis using temperature measurements may be suĆcient. Dynamic models
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Users of the VEMAP Portal can access input files of numerical data that include monthly and daily files of geographic data, soil and site files, scenario files, etc. Model results from Phase I, the Equilibrium Response datasets, are available through the NCAR anonymous FTP site at http://www.cgd.ucar.edu/vemap/vresults.html. Phase II, Transient Dynamics, include climate datasets, models results, and analysis tools. Many supplemental files are also available from the main data page at http://www.cgd.ucar.edu/vemap/datasets.html.
The development of an approximate dynamic analysis of insulating glass units
Sequeira, Miguel Angel
1995-01-01T23:59:59.000Z
of this approximate dynamic analysis of IG units is achieved by modeling the unit with two equivalent single degree of freedom systems consisting of equivalent masses, equivalent structural stiIIhesses, equivalent forces, and by incorporating air space... the deflection of the equivalent mass coincides with that of the base point, the equivalent stiIIhess, K? is found as follows: K, = (Biggs 1964). Then, the resistance factor is found to be: F, K, F?, b ' =K, F, F~( (12) (Biggs 1964). After substitution...
Wavelet analysis to characterize cluster dynamics in a circulating fluidized bed
Guenther, C.; Breault, R.W.
2007-04-30T23:59:59.000Z
A common hydrodynamic feature in heavily loaded circulating fluidized beds is the presence of clusters. The continuous formation and destruction of clusters strongly influences particle hold-up, pressure drop, heat transfer at the wall, and mixing. In this paper fiber optic data is analyzed using discrete wavelet analysis to characterize the dynamic behavior of clusters. Five radial positions at three different axial locations under five different operating conditions spanning three different flow regimes were analyzed using discrete wavelets. Results are summarized with respect to cluster size and frequency.
CSUR4402-06 ACM-TRANSACTION February 8, 2012 20:36 A Survey on Automated Dynamic Malware-Analysis
Kruegel, Christopher
CSUR4402-06 ACM-TRANSACTION February 8, 2012 20:36 6 A Survey on Automated Dynamic Malware: Dynamic analysis, malware ACM Reference Format: Egele, M., Scholte, T., Kirda, E., and Kruegel, C. 2012. A survey on automated dynamic malware-analysis techniques and tools. ACM Comput. Surv. 44, 2, Article 6
Yang, L.; Yao, Y.; Ma, Z.
2006-01-01T23:59:59.000Z
-to-water double-stage coupled heat pump system, is presented in this paper based on analyzing the characteristics of the villa district heating. Prediction and analysis of the feasibility of the double-stage coupled heat pump system in cold areas were carried...
Unsteady adjoint analysis for output sensitivity and mesh adaptation
Krakos, Joshua Ambre
2012-01-01T23:59:59.000Z
Adjoint analysis in computational fluid dynamics (CFD) has been applied to design optimization and mesh adaptation, but due to the relative expense of unsteady analysis these applications have predominantly been for steady ...
M. Baratlo; H. Fazli
2009-12-11T23:59:59.000Z
Planar brushes of flexible, semiflexible and rodlike diblock polyampholytes are studied using molecular dynamics simulations and scaling analysis in a wide range of the grafting density. Simulations show linear dependence of the average thickness on the grafting density for all the brushes regardless of their different equilibrium conformations and different flexibility of anchored chains. Slopes of fitted lines to the average thickness of the brushes of semiflexible and rodlike polyampholytes versus the grafting density are approximately the same and differ considerably from that of the brush of flexible chains. The average thickness of the brush of diblock polyampholytes is also obtained as a function of the grafting density using a simple scaling analysis which is in good agreement with the results of our simulations.
Dynamics of stainless steel turning: Analysis by flicker-noise spectroscopy
Grzegorz Litak; Yuriy S. Polyakov; Serge F. Timashev; Rafal Rusinek
2013-07-31T23:59:59.000Z
We use flicker-noise spectroscopy (FNS), a phenomenological method for the analysis of time and spatial series operating on structure functions and power spectrum estimates, to identify and study harmful chatter vibrations in a regenerative turning process. The 3D cutting force components experimentally measured during stainless steel turning are analyzed, and the parameters of their stochastic dynamics are estimated. Our analysis shows that the system initially exhibiting regular vibrations associated with spindle rotation becomes unstable to high-frequency noisy oscillations (chatter) at larger cutting depths. We suggest that the chatter may be attributed to frictional stick-and-slip interactions between the contact surfaces of cutting tool and workpiece. We compare our findings with previously reported results obtained by statistical, recurrence, multifractal, and wavelet methods. We discuss the potential of FNS in monitoring the turning process in manufacturing practice.
Seok, Sangok
2014-01-01T23:59:59.000Z
This thesis presents highly parallelized control programming methodologies developed for multi-degrees of freedom (DoF) robots capable of highly dynamic movements. In robotic applications that require rapid physical ...
Vidal, René
examples of dynamic scenes are videos of non-rigid objects such as water, fire, flags fluttering in the air friendly Riemannian structure. However, as we will de- scribe in this paper, these approaches have some
Analysis of liquid natural gas as a truck fuel: a system dynamics approach
Bray, M.A.; Sebo, D.E.; Mason, T.L.; Mills, J.I.; Rice, R.E.
1996-10-01T23:59:59.000Z
The purpose of this analysis is to evaluate the potential for growth in use of liquid natural gas (LNG) fueled trucks. . A system dynamics model was constructed for the analysis and a variety of scenarios were investigated. The analysis considers the economics of LNG fuel in the context of the trucking industry to identify barriers to the increased use of LNG trucks and potential interventions or leverage points which may overcome these barriers. The study showed that today, LNG use in trucks is not yet economically viable. A large change in the savings from fuel cost or capital cost is needed for the technology to take off. Fleet owners have no way now to benefit from the environmental benefits of LNG fuel nor do they benefit from the clean burning nature of the fuel. Changes in the fuel cost differential between diesel and LNG are not a research issue. However, quantifying the improvements in reliability and wear from the use of clean fuel could support increased maintenance and warranty periods. Many people involved in the use of LNG for trucks believe that LNG has the potential to occupy a niche within the larger diesel truck business. But if LNG in trucks can become economic, the spread of fuel stations and technology improvements could lead to LNG trucks becoming the dominant technology. An assumption in our simulation work is that LNG trucks will be purchased when economically attractive. None of the simulation results show LNG becoming economic but then only to the level of a niche market.
Nonlinear dynamics analysis of a membrane Stirling engine: Starting and stable operation
Formosa, Fabien
2013-01-01T23:59:59.000Z
This paper presents the work devoted to the study of the operation of a miniaturized membrane Stirling engine. Indeed, such an engine relies on the dynamic coupling of the motion of two membranes to achieve a prime mover Stirling thermodynamic cycle. The modelling of the system introduces the large vibration amplitudes of the membrane as well as the nonlinear dissipative effects associated to the fluid flow within the engine. The nonlinearities are expressed as polynomial functions with quadratic and cubic terms. This paper displays the stability analysis to predict the starting of the engine and the instability problem which leads to the steady state behaviour. The centre manifold - normal form theory is used to obtain the simplest expression for the limit cycle amplitudes. The approach allows the reduction of the number of equations of the original system in order to obtain a simplified system, without loosing the dynamics of the original system as well as the contributions of non-linear terms. The model in...
Wu, T
2008-04-30T23:59:59.000Z
Large fuel casks present challenges when evaluating their performance in the Hypothetical Accident Conditions (HAC) specified in the Code of Federal Regulations Title 10 part 71 (10CFR71). Testing is often limited by cost, difficulty in preparing test units and the limited availability of facilities which can carry out such tests. In the past, many casks were evaluated without testing by using simplified analytical methods. This paper presents a numerical technique for evaluating the dynamic responses of large fuel casks subjected to sequential HAC loading. A nonlinear dynamic analysis was performed for a Hanford Unirradiated Fuel Package (HUFP) [1] to evaluate the cumulative damage after the hypothetical accident Conditions of a 30-foot lateral drop followed by a 40-inch lateral puncture as specified in 10CFR71. The structural integrity of the containment vessel is justified based on the analytical results in comparison with the stress criteria, specified in the ASME Code, Section III, Appendix F [2], for Level D service loads. The analyzed cumulative damages caused by the sequential loading of a 30-foot lateral drop and a 40-inch lateral puncture are compared with the package test data. The analytical results are in good agreement with the test results.
Dynamic nuclear renography kinetic analysis: Four-compartment model for assessing kidney function
Raswan, T. R., E-mail: tara.raissa@gmail.com; Haryanto, F., E-mail: tara.raissa@gmail.com [Department of Physics, Nuclear Physics and Biophysics Research Group, Institut Teknologi Bandung, Bandung (Indonesia)
2014-09-30T23:59:59.000Z
Dynamic nuclear renography method produces TACs of kidneys and bladder. Multiple TACs data can be further analyzed to obtain the overview of urinary system's condition. Tracer kinetic analysis was performed using four-compartment models. The system's model consist of four irreversible compartment with four transport constants (k1, k2, k3 and k4). The mathematical expressions of tracer's distributions is fitted to experimental data (TACs) resulting in model constants. This transport constants represent the urinary system behavior, and later can be used for analyzing system's condition. Different intervals of kinetics parameter are clearly shown by abnormal system with respect to the normal one. Furthermore, the system with delayed uptake has 82% lower uptake parameters (k1 and k2) than normal one. Meanwhile, the system with prolonged clearance time has its kinetics parameters k3 or k4 lower than the others. This model is promising for quantitatively describe urinary system's function especially if supplied with more data.
Kumar, M. Jagadesh
in power systems have been explored and compared Balanced truncation (BT) and Krylov subspace between the wind velocity/system frequency and the power output. These linear models, validated using DigABSTRACT This thesis applies model order reduction (MOR) techniques to large modern power systems
Paris-Sud XI, Université de
Anti-optimisation applied to the analysis of rotor/stator interaction Note: this article is part in the design process, so there is a need for efficient and practical computational models that can predict
Assessment of Models for Pedestrian Dynamics with Functional Principal Component Analysis
Chraibi, M; Gottschalk, H; Saadi, M; Seyfried, A
2015-01-01T23:59:59.000Z
Many agent based simulation approaches have been proposed for pedestrian flow. As such models are applied e.g.\\ in evacuation studies, the quality and reliability of such models is of vital interest. Pedestrian trajectories are functional data and thus functional principal component analysis is a natural tool to asses the quality of pedestrian flow models beyond average properties. In this article we conduct functional PCA for the trajectories of pedestrians passing through a bottleneck. We benchmark two agent based models of pedestrian flow against the experimental data using PCA average and stochastic features. Functional PCA proves to be an efficient tool to detect deviation between simulation and experiment and to asses quality of pedestrian models.
Zhang, Y. S. [Department of Scientific Research, Dalian Naval Academy, Dalian 116018 (China); Cai, F. [Department of Navigation, Dalian Naval Academy, Dalian 116018 (China); Xu, W. M. [Department of Hydrography and Cartography, Dalian Naval Academy, Dalian 116018 (China)
2011-09-28T23:59:59.000Z
The ship motion equation with a cosine wave excitement force describes the slip moments in regular waves. A new kind of wave excitement force model, with the form as sums of cosine functions was proposed to describe ship rolling in irregular waves. Ship rolling time series were obtained by solving the ship motion equation with the fourth-order-Runger-Kutta method. These rolling time series were synthetically analyzed with methods of phase-space track, power spectrum, primary component analysis, and the largest Lyapunove exponent. Simulation results show that ship rolling presents some chaotic characteristic when the wave excitement force was applied by sums of cosine functions. The result well explains the course of ship rolling's chaotic mechanism and is useful for ship hydrodynamic study.
Constructing a Knowledge Base for Gene Regulatory Dynamics by Formal Concept Analysis Methods
Wollbold, Johannes; Ganter, Bernhard
2008-01-01T23:59:59.000Z
Our aim is to build a set of rules, such that reasoning over temporal dependencies within gene regulatory networks is possible. The underlying transitions may be obtained by discretizing observed time series, or they are generated based on existing knowledge, e.g. by Boolean networks or their nondeterministic generalization. We use the mathematical discipline of formal concept analysis (FCA), which has been applied successfully in domains as knowledge representation, data mining or software engineering. By the attribute exploration algorithm, an expert or a supporting computer program is enabled to decide about the validity of a minimal set of implications and thus to construct a sound and complete knowledge base. From this all valid implications are derivable that relate to the selected properties of a set of genes. We present results of our method for the initiation of sporulation in Bacillus subtilis. However the formal structures are exhibited in a most general manner. Therefore the approach may be adapte...
Masciola, M.; Jonkman, J.; Robertson, A.
2014-03-01T23:59:59.000Z
Techniques to model dynamic mooring lines come in various forms. The most widely used models include either a heuristic representation of the physics (such as a Lumped-Mass, LM, system), a Finite-Element Analysis (FEA) discretization of the lines (discretized in space), or a Finite-Difference (FD) model (which is discretized in both space and time). In this paper, we explore the features of the various models, weigh the advantages of each, and propose a plan for implementing one dynamic mooring line model into the open-source Mooring Analysis Program (MAP). MAP is currently used as a module for the FAST offshore wind turbine computer-aided engineering (CAE) tool to model mooring systems quasi-statically, although dynamic mooring capabilities are desired. Based on the exploration in this manuscript, the lumped-mass representation is selected for implementation in MAP based on its simplicity, computational cost, and ability to provide similar physics captured by higher-order models.
Frisani, Angelo
2011-08-08T23:59:59.000Z
. The design and validation of the RCCS is necessary to demonstrate that VHTRs can survive to the postulated accidents. The commercial Computational Fluid Dynamics (CFD) STAR-CCM+/ V3.06.006 code was used for three-dimensional system modeling and analysis...
Moisseytsev, A.; Sienicki, J. J. (Nuclear Engineering Division)
2011-04-12T23:59:59.000Z
The analysis of specific control strategies and dynamic behavior of the supercritical carbon dioxide (S-CO{sub 2}) Brayton cycle has been extended to the two reactor types selected for continued development under the Generation IV Nuclear Energy Systems Initiative; namely, the Very High Temperature Reactor (VHTR) and the Sodium-Cooled Fast Reactor (SFR). Direct application of the standard S-CO{sub 2} recompression cycle to the VHTR was found to be challenging because of the mismatch in the temperature drop of the He gaseous reactor coolant through the He-to-CO{sub 2} reactor heat exchanger (RHX) versus the temperature rise of the CO{sub 2} through the RHX. The reference VHTR features a large temperature drop of 450 C between the assumed core outlet and inlet temperatures of 850 and 400 C, respectively. This large temperature difference is an essential feature of the VHTR enabling a lower He flow rate reducing the required core velocities and pressure drop. In contrast, the standard recompression S-CO{sub 2} cycle wants to operate with a temperature rise through the RHX of about 150 C reflecting the temperature drop as the CO{sub 2} expands from 20 MPa to 7.4 MPa in the turbine and the fact that the cycle is highly recuperated such that the CO{sub 2} entering the RHX is effectively preheated. Because of this mismatch, direct application of the standard recompression cycle results in a relatively poor cycle efficiency of 44.9%. However, two approaches have been identified by which the S-CO{sub 2} cycle can be successfully adapted to the VHTR and the benefits of the S-CO{sub 2} cycle, especially a significant gain in cycle efficiency, can be realized. The first approach involves the use of three separate cascaded S-CO{sub 2} cycles. Each S-CO{sub 2} cycle is coupled to the VHTR through its own He-to-CO{sub 2} RHX in which the He temperature is reduced by 150 C. The three respective cycles have efficiencies of 54, 50, and 44%, respectively, resulting in a net cycle efficiency of 49.3 %. The other approach involves reducing the minimum cycle pressure significantly below the critical pressure such that the temperature drop in the turbine is increased while the minimum cycle temperature is maintained above the critical temperature to prevent the formation of a liquid phase. The latter approach also involves the addition of a precooler and a third compressor before the main compressor to retain the benefits of compression near the critical point with the main compressor. For a minimum cycle pressure of 1 MPa, a cycle efficiency of 49.5% is achieved. Either approach opens up the door to applying the SCO{sub 2} cycle to the VHTR. In contrast, the SFR system typically has a core outlet-inlet temperature difference of about 150 C such that the standard recompression cycle is ideally suited for direct application to the SFR. The ANL Plant Dynamics Code has been modified for application to the VHTR and SFR when the reactor side dynamic behavior is calculated with another system level computer code such as SAS4A/SYSSYS-1 in the SFR case. The key modification involves modeling heat exchange in the RHX, accepting time dependent tabular input from the reactor code, and generating time dependent tabular input to the reactor code such that both the reactor and S-CO{sub 2} cycle sides can be calculated in a convergent iterative scheme. This approach retains the modeling benefits provided by the detailed reactor system level code and can be applied to any reactor system type incorporating a S-CO{sub 2} cycle. This approach was applied to the particular calculation of a scram scenario for a SFR in which the main and intermediate sodium pumps are not tripped and the generator is not disconnected from the electrical grid in order to enhance heat removal from the reactor system thereby enhancing the cooldown rate of the Na-to-CO{sub 2} RHX. The reactor side is calculated with SAS4A/SASSYS-1 while the S-CO{sub 2} cycle is calculated with the Plant Dynamics Code with a number of iterations over a timescale of 500 seconds. It is found that the RHX u
Murray, Richard M.
. Compared with more traditional applica- tions of control theory, there are fundamentally new features Hassibi and Richard M. Murray Division of Engineering and Applied Science California Institute the topology of the network specifies the information flow between the agents. We present an analysis method
Fleming, Andrew J.
and imperfections during the manufactur- ing process of the tube on the dynamics-coupling-caused errors in openSimulation of dynamics-coupling in piezoelectric tube scanners by reduced order finite element as the compensation of dynamics-coupling effects. The present article gives a detailed description of the fully
Principal Component Analysis of Molecular Clouds: Can CO reveal the dynamics?
Bertram, Erik; Glover, Simon C O; Klessen, Ralf S; Roman-Duval, Julia; Federrath, Christoph
2014-01-01T23:59:59.000Z
We use Principal Component Analysis (PCA) to study the gas dynamics in numerical simulations of typical MCs. Our simulations account for the non-isothermal nature of the gas and include a simplified treatment of the time-dependent gas chemistry. We model the CO line emission in a post-processing step using a 3D radiative transfer code. We consider mean number densities n_0 = 30, 100, 300 cm^{-3} that span the range of values typical for MCs in the solar neighbourhood and investigate the slope \\alpha_{PCA} of the pseudo structure function computed by PCA for several components: the total density, H2 density, 12CO density, 12CO J = 1 -> 0 intensity and 13CO J = 1 -> 0 intensity. We estimate power-law indices \\alpha_{PCA} for different chemical species that range from 0.5 to 0.9, in good agreement with observations, and demonstrate that optical depth effects can influence the PCA. We show that when the PCA succeeds, the combination of chemical inhomogeneity and radiative transfer effects can influence the observ...
Linear and Nonlinear PT-symmetric Oligomers: A Dynamical Systems Analysis
M. Duanmu; K. Li; R. L. Horne; P. G. Kevrekidis; N. Whitaker
2012-10-15T23:59:59.000Z
In the present work we focus on the cases of two-site (dimer) and three-site (trimer) configurations, i.e. oligomers, respecting the parity-time (PT) symmetry, i.e., with a spatially odd gain-loss profile. We examine different types of solutions of such configurations with linear and nonlinear gain/loss profiles. Solutions beyond the linear PT-symmetry critical point as well as solutions with asymmetric linearization eigenvalues are found in both the nonlinear dimer and trimer. The latter feature is absent in linear PT-symmetric trimers, while both of them are absent in linear PT symmetric dimers. Furthermore, nonlinear gain/loss terms enable the existence of both symmetric and asymmetric solution profiles (and of bifurcations between them), while only symmetric solutions are present in the linear PT-symmetric dimers and trimers. The linear stability analysis around the obtained solutions is discussed and their dynamical evolution is explored by means of direct numerical simulations. Finally, a brief discussion is also given of recent progress in the context of PT-symmetric quadrimers.
Antonio C. C. Guimarăes; Laerte Sodré Jr.
2007-06-21T23:59:59.000Z
We readdress the calculation of the mass of early-type galaxies using strong gravitational lensing and stellar dynamics. Our sample comprises 27 galaxies in the Sloan Lens ACS (SLACS) Survey. Comparing the mass estimates from these two independent methods in a Bayesian framework, we find evidence of significant line-of-sight mass contamination. Assuming a power-law mass distribution, the best fit density profile is given by $\\rho \\propto r^{-1.69\\pm0.05}$. We show that neglecting the line-of-sight mass contamination produces an overestimate of the mass attributed to the lens-galaxy by the lensing method, which introduces a bias in favor of a SIS profile when using the joint lensing and dynamic analysis to determine the slope of the density profile. We suggest that the line-of-sight contamination could also be important for other astrophysical and cosmological uses of joint lensing and dynamical measurements.
Thomas Speck; Andreas M. Menzel; Julian Bialké; Hartmut Löwen
2015-03-29T23:59:59.000Z
Recently, we have derived an effective Cahn-Hilliard equation for the phase separation dynamics of active Brownian particles by performing a weakly non-linear analysis of the effective hydrodynamic equations for density and polarization [Phys. Rev. Lett. 112, 218304 (2014)]. Here we develop and explore this strategy in more detail and show explicitly how to get to such a large-scale, mean-field description starting from the microscopic dynamics. The effective free energy emerging from this approach has the form of a conventional Ginzburg-Landau function. On the coarsest scale, our results thus agree with the mapping of active phase separation onto that of passive fluids with attractive interactions through a global effective free energy (mobility-induced phase transition). Particular attention is paid to the square-gradient term necessary for the dynamics. We finally discuss results from numerical simulations corroborating the analytical results.
Diana K. Grauer
2011-10-01T23:59:59.000Z
This paper presents an investigation into integrated wind + combustion engine high penetration electrical generation systems. Renewable generation systems are now a reality of electrical transmission. Unfortunately, many of these renewable energy supplies are stochastic and highly dynamic. Conversely, the existing national grid has been designed for steady state operation. The research team has developed an algorithm to investigate the feasibility and relative capability of a reciprocating internal combustion engine to directly integrate with wind generation in a tightly coupled Hybrid Energy System. Utilizing the Idaho National Laboratory developed Phoenix Model Integration Platform, the research team has coupled demand data with wind turbine generation data and the Aspen Custom Modeler reciprocating engine electrical generator model to investigate the capability of reciprocating engine electrical generation to balance stochastic renewable energy.
Anwar, Moshiur Mekhail
2007-01-01T23:59:59.000Z
The study of proteins in biological systems requires a comprehensive approach: investigating dynamics, interaction and identification. This thesis will examine several technological approaches we have developed to address ...
Choi, Min-Hyung
Simulation Systems Hongjun Jeon1 Min-Hyung Choi2 Min Hong3 1 Dept. of Electrical and Computer Engineering and trajectories of dynamically simulated entities. Therefore, effective and efficient enforcement and proper describes the formulation and integration of geometric constraints in a dynamic simulation and provides
Kang, Heonyong
2014-09-05T23:59:59.000Z
of hydroelastic dynamic analysis for slender pontoon ................. 52 Figure 7. Hydroelastic dynamic motion for rigid mode responses on frequency domain for slender body... comparison between the flexible and rigid body assumptions ......... 84 Figure 35. Dominant effects from mooring tensions ....................................................... 85 Figure 36. Stress resultant comparisons between the moored and freely...
Taylor, L.L.; Wilson, J.R. (INEEL); Sanchez, L.C.; Aguilar, R.; Trellue, H.R.; Cochrane, K. (SNL); Rath, J.S. (New Mexico Engineering Research Institute)
1998-10-01T23:59:59.000Z
The United States Department of Energy Office of Environmental Management's (DOE/EM's) National Spent Nuclear Fuel Program (NSNFP), through a collaboration between Sandia National Laboratories (SNL) and Idaho National Engineering and Environmental Laboratory (INEEL), is conducting a systematic Nuclear Dynamics Consequence Analysis (NDCA) of the disposal of SNFs in an underground geologic repository sited in unsaturated tuff. This analysis is intended to provide interim guidance to the DOE for the management of the SNF while they prepare for final compliance evaluation. This report presents results from a Nuclear Dynamics Consequence Analysis (NDCA) that examined the potential consequences and risks of criticality during the long-term disposal of spent nuclear fuel owned by DOE-EM. This analysis investigated the potential of post-closure criticality, the consequences of a criticality excursion, and the probability frequency for post-closure criticality. The results of the NDCA are intended to provide the DOE-EM with a technical basis for measuring risk which can be used for screening arguments to eliminate post-closure criticality FEPs (features, events and processes) from consideration in the compliance assessment because of either low probability or low consequences. This report is composed of an executive summary (Volume 1), the methodology and results of the NDCA (Volume 2), and the applicable appendices (Volume 3).
Singh, Nirvikar; Mora, Jesse; Carolan, Terrie
2012-01-01T23:59:59.000Z
in the current analysis. Trade Dynamics in the East AsianProduct fragmentation and trade integration: East Asia in aand William H. Branson, ed. , Trade and Structural Change in
Dynamical System Analysis and Forecasting of Deformation Produced by an Earthquake Fault
Ben-Zion, Yehuda
-forward artificial neural network (ANN) architecture for the identification of the system dynamics projected onto. A practical alternative is to build ``phenomenological'' models that attempt to estimate the overall character
Machining dynamics and stability analysis in longitudinal turning involving workpiece whirling
Dassanayake, Achala Viomy
2009-06-02T23:59:59.000Z
Tool chatter in longitudinal turning is addressed with a new perspective using a complex machining model describing the coupled tool-workpiece dynamics subject to nonlinear regenerative cutting forces, instantaneous depth-of-cut (DOC) and workpiece...
An Analysis of the Dynamics of the US Commercial Air Transportation System
Tam, Ryan
Major trends in the airline industry are analyzed to highlight key dynamics that govern the US domestic air transportation system. The hypothesis is that air travel supply and demand equilibriums, a reliance on outside ...
Jimenez-Victory, Juan Carlos
1999-01-01T23:59:59.000Z
A study of the dynamic behavior of polycrystalline Shape Memory Alloys (SMA) under impact loading was proposed. The purpose of this study was to obtain basic understanding of the thermomechanical response of SMAs under ...
Cavalcanti De Sousa, Pedro
2010-10-12T23:59:59.000Z
Fatigue cracking and moisture damage are two important modes of distresses in asphalt pavements. Recently, the Dynamic Mechanical Analyzer (DMA) was used to characterize fatigue cracking and evaluate the effects of moisture ...
Wang, Jo-Yu
1994-01-01T23:59:59.000Z
properties of glass bead-epoxy composites by measuring mechanical properties obtained through dynamic mechanical testing. The viscoelastic material properties of glass bead-composites, including glassy and rubbery moduli and the loss tangent (tanb) were...
Asgarian, Behrouz [K.N. Toosi University of Technology Tehran Iran (Iran, Islamic Republic of); Shokrgozar, Hamed R.; Talarposhti, Ali Shakeri [K.N. Toosi University of Technology, Tehran (Iran, Islamic Republic of)
2008-07-08T23:59:59.000Z
Of great interest in Performance-Based Earthquake Engineering (PBEE) is the accurate estimation of the seismic performance of structures. A performance prediction and evaluation procedure is based on nonlinear dynamics and reliability theory. In this method, a full integration over the three key stochastic models is as follow: ground motion hazard curve, nonlinear dynamic displacement demand, and displacement capacity. Further, both epistemic and aleatory uncertainties are evaluated and carried through the analysis.In this paper, jacket and soil-pile system have been modeled using Finite Element program (OpenSees) and the incremental dynamic analysis (IDA) are performed to investigate nonlinear behavior of offshore platforms. The system demand is determined by performing time history response analyses of the jacket under a suite of FEMA/SAC uniform hazard ground motions. The system capacity in terms of the drift ratio against incipient collapse is generally difficult to predict since the structural response goes into nonlinear range before collapse. All the analyses are performed in two directions and the results are compared with each others. The confidence level of a jacket in each direction for a given hazard level is calculated using the procedure described.
2007-01-0258 Dynamic Load and Stress Analysis of a Crankshaft
Fatemi, Ali
of the main bearing wall structure, the mass, damping and stiffness matrices were built at each time step and was verified by simulation in ADAMS which resulted in the load spectrum applied to crank pin bearing. This load
Fluid Dynamics Models for Low Rank Discriminant Analysis Yung-Kyun Noh1,2
and velocity flow fields. We show how to apply the Gauss principle of least con- straint in fluids to obtain., 2000). Projection pursuit is a canonical approach to find a low dimen- sional subspace where
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm BiofuelinAnalysis ofAntonyaFederal(SC)FBerkeley LabCCS1 Applied
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm BiofuelinAnalysis ofAntonyaFederal(SC)FBerkeleyApply for
Dynamic programming applied to electromagnetic satellite actuation
Eslinger, Gregory John
2013-01-01T23:59:59.000Z
Electromagnetic formation flight (EMFF) is an enabling technology for a number of space mission architectures. While much work has been done for EMFF control for large separation distances, little work has been done for ...
A Massively Parallel Sparse Eigensolver for Structural Dynamics Finite Element Analysis
Day, David M.; Reese, G.M.
1999-05-01T23:59:59.000Z
Eigenanalysis is a critical component of structural dynamics which is essential for determinating the vibrational response of systems. This effort addresses the development of numerical algorithms associated with scalable eigensolver techniques suitable for use on massively parallel, distributed memory computers that are capable of solving large scale structural dynamics problems. An iterative Lanczos method was determined to be the best choice for the application. Scalability of the eigenproblem depends on scalability of the underlying linear solver. A multi-level solver (FETI) was selected as most promising for this component. Issues relating to heterogeneous materials, mechanisms and multipoint constraints have been examined, and the linear solver algorithm has been developed to incorporate features that result in a scalable, robust algorithm for practical structural dynamics applications. The resulting tools have been demonstrated on large problems representative of a weapon's system.
Chen, Yousu; Huang, Zhenyu; Rice, Mark J.
2012-12-27T23:59:59.000Z
Contingency analysis studies are necessary to assess the impact of possible power system component failures. The results of the contingency analysis are used to ensure the grid reliability, and in power market operation for the feasibility test of market solutions. Currently, these studies are performed in real time based on the current operating conditions of the grid with a set of pre-selected contingency list, which might result in overlooking some critical contingencies caused by variable system status. To have a complete picture of a power grid, more contingencies need to be studied to improve grid reliability. High-performance computing techniques hold the promise of being able to perform the analysis for more contingency cases within a much shorter time frame. This paper evaluates the performance of counter-based dynamic load balancing schemes for a massive contingency analysis program on 10,000+ cores. One million N-2 contingency analysis cases with a Western Electricity Coordinating Council power grid model have been used to demonstrate the performance. The speedup of 3964 with 4096 cores and 7877 with 10240 cores are obtained. This paper reports the performance of the load balancing scheme with a single counter and two counters, describes disk I/O issues, and discusses other potential techniques for further improving the performance.
Dynamic Pressure Improvements to Closed-Circuit Wind Tunnels with Flow Quality Analysis
Herring, Alexander
2015-03-31T23:59:59.000Z
Experiment Station Low-Speed Wind Tunnel (LSWT) was limited through available power to a dynamic pressure of 120 psf. The addition of a higher power motor, construction of a new, smaller test section, diffuser liners to prevent flow separation, and increased...
Analysis of Instruction-level Vulnerability to Dynamic Voltage and Temperature Variations
Gupta, Rajesh
and supply voltage droops [2]. Static process variations can sometimes be mitigated through binning of dynamic variation from environmental and workload changes include supply voltage droops and temperature changes. Voltage droops result from abrupt changes in the switching activity, inducing large current
Maruyama, Shigeo
Mode Projection(NMP)(17,18,20,21) Spectral Energy Density (SED)(22) LDeMDu u'MDu' 1 Fig. 1 Flow chart[(8)] 22 0 )( 1 )( f (8) k(22) Fig. 3 Flow chart of the lattice dynamics method. 1 2 3 4 5 6 7 8 9 methods using normal mode projection and spectral energy density. By performing the calculations
Generalized models as a universal approach to the analysis of nonlinear dynamical systems
Thilo Gross; Ulrike Feudel
2006-01-29T23:59:59.000Z
We present a universal approach to the investigation of the dynamics in generalized models. In these models the processes that are taken into account are not restricted to specific functional forms. Therefore a single generalized models can describe a class of systems which share a similar structure. Despite this generality, the proposed approach allows us to study the dynamical properties of generalized models efficiently in the framework of local bifurcation theory. The approach is based on a normalization procedure that is used to identify natural parameters of the system. The Jacobian in a steady state is then derived as a function of these parameters. The analytical computation of local bifurcations using computer algebra reveals conditions for the local asymptotic stability of steady states and provides certain insights on the global dynamics of the system. The proposed approach yields a close connection between modelling and nonlinear dynamics. We illustrate the investigation of generalized models by considering examples from three different disciplines of science: a socio-economic model of dynastic cycles in china, a model for a coupled laser system and a general ecological food web.
Automating Presentation Changes in Dynamic Web Applications via Collaborative Hybrid Analysis
Xie, Tao
Xiaoyin Wang1 , Lu Zhang1 , Tao Xie2 , Yingfei Xiong1 , Hong Mei1 1 Key Laboratory of High Confidence display errors, adding user-interface controls, or changing appearance styles. To change the presentation that generates the web pages. As manually performing presentation changes in dynamic web ap- plications
Small IV, W; Wilson, T S
2010-02-11T23:59:59.000Z
Dynamic mechanical thermal analysis (DMTA) of virgin TR-55 silicone rubber specimens was conducted. Two dynamic temperature sweep tests, 25 to -100 C and 25 to -70 to 0 C (ramp rate = 1 C/min), were conducted at a frequency of 6.28 rad/s (1 Hz) using a torsion rectangular test geometry. A strain of 0.1% was used, which was near the upper limit of the linear viscoelastic region of the material based on an initial dynamic strain sweep test. Storage (G{prime}) and loss (G{double_prime}) moduli, the ratio G{double_prime}/G{prime} (tan {delta}), and the coefficient of linear thermal expansion ({alpha}) were determined as a function of temperature. Crystallization occurred between -40 and -60 C, with G{prime} increasing from {approx}6 x 10{sup 6} to {approx}4 x 10{sup 8} Pa. The value of {alpha} was fairly constant before ({approx}4 x 10{sup -4} mm/mm- C) and after ({approx}3 x 10{sup -4} mm/mm- C) the transition, and peaked during the transition ({approx}3 x 10{sup -3} mm/mm- C). Melting occurred around -30 C upon heating.
Vimmerstedt, L. J.; Bush, B.; Peterson, S.
2012-05-01T23:59:59.000Z
The Energy Independence and Security Act of 2007 targets use of 36 billion gallons of biofuels per year by 2022. Achieving this may require substantial changes to current transportation fuel systems for distribution, dispensing, and use in vehicles. The U.S. Department of Energy and the National Renewable Energy Laboratory designed a system dynamics approach to help focus government action by determining what supply chain changes would have the greatest potential to accelerate biofuels deployment. The National Renewable Energy Laboratory developed the Biomass Scenario Model, a system dynamics model which represents the primary system effects and dependencies in the biomass-to-biofuels supply chain. The model provides a framework for developing scenarios and conducting biofuels policy analysis. This paper focuses on the downstream portion of the supply chain-represented in the distribution logistics, dispensing station, and fuel utilization, and vehicle modules of the Biomass Scenario Model. This model initially focused on ethanol, but has since been expanded to include other biofuels. Some portions of this system are represented dynamically with major interactions and feedbacks, especially those related to a dispensing station owner's decision whether to offer ethanol fuel and a consumer's choice whether to purchase that fuel. Other portions of the system are modeled with little or no dynamics; the vehicle choices of consumers are represented as discrete scenarios. This paper explores conditions needed to sustain an ethanol fuel market and identifies implications of these findings for program and policy goals. A large, economically sustainable ethanol fuel market (or other biofuel market) requires low end-user fuel price relative to gasoline and sufficient producer payment, which are difficult to achieve simultaneously. Other requirements (different for ethanol vs. other biofuel markets) include the need for infrastructure for distribution and dispensing and widespread use of high ethanol blends in flexible-fuel vehicles.
Rahmani, Amir M; Jupiterwala, Mehlam; Colosqui, Carlos E
2015-01-01T23:59:59.000Z
Plane Poiseuille flow past a nanoscale cylinder that is arbitrarily confined (i.e., symmetrically or asymmetrically confined) in a slit channel is studied via hydrodynamic lubrication theory and molecular dynamics simulations, considering cases where the cylinder remains static or undergoes thermal motion. Lubrication theory predictions for the drag force and volumetric flow rate are in close agreement with molecular dynamics simulations of flows having molecularly thin lubrication gaps, despite the presence of significant structural forces induced by the crystalline structure of the modeled solid. While the maximum drag force is observed in symmetric confinement, i.e., when the cylinder is equidistant from both channel walls, the drag decays significantly as the cylinder moves away from the channel centerline and approaches a wall. Hence, significant reductions in the mean drag force on the cylinder and hydraulic resistance of the channel can be observed when thermal motion induces random off-center displace...
Prior, Javier; Castro, Enrique [Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena 30202 (Spain)] [Departamento de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena 30202 (Spain); Chin, Alex W. [Theory of Condensed Matter Group, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE (United Kingdom)] [Theory of Condensed Matter Group, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE (United Kingdom); Almeida, Javier; Huelga, Susana F.; Plenio, Martin B. [Institut für Theoretische Physik, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm (Germany)] [Institut für Theoretische Physik, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm (Germany)
2013-12-14T23:59:59.000Z
New experimental techniques based on nonlinear ultrafast spectroscopies have been developed over the last few years, and have been demonstrated to provide powerful probes of quantum dynamics in different types of molecular aggregates, including both natural and artificial light harvesting complexes. Fourier transform-based spectroscopies have been particularly successful, yet “complete” spectral information normally necessitates the loss of all information on the temporal sequence of events in a signal. This information though is particularly important in transient or multi-stage processes, in which the spectral decomposition of the data evolves in time. By going through several examples of ultrafast quantum dynamics, we demonstrate that the use of wavelets provide an efficient and accurate way to simultaneously acquire both temporal and frequency information about a signal, and argue that this greatly aids the elucidation and interpretation of physical process responsible for non-stationary spectroscopic features, such as those encountered in coherent excitonic energy transport.
15.075 Applied Statistics, Spring 2003
Newton, Elizabeth
This course is an introduction to applied statistics and data analysis. Topics include collecting and exploring data, basic inference, simple and multiple linear regression, analysis of variance, nonparametric methods, and ...
Rhythm and the Brain Analysis of Neural Dynamics Accompanying Musical Beat Perception
Makeig, Scott
and beat perception in motor areas of the brain.J Cogn Neurosci 19:893906. Iversen JR,Repp BH,Patel AD (2009) Top-down control of rhythm perception modulates early auditory responses. Ann N Y Acad Sci 1169:10979-10984. Makeig SD,Debener S,Onton J,Delorme A (2004) Mining event-related brain dynamics.Trends Cogn Sci 8
RESONANCES REQUIRED: DYNAMICAL ANALYSIS OF THE 24 Sex AND HD 200964 PLANETARY SYSTEMS
Wittenmyer, Robert A.; Horner, Jonathan; Tinney, C. G., E-mail: rob@phys.unsw.edu.au [Department of Astrophysics, School of Physics, Faculty of Science, University of New South Wales, NSW 2052 (Australia)
2012-12-20T23:59:59.000Z
We perform several suites of highly detailed dynamical simulations to investigate the architectures of the 24 Sextantis and HD 200964 planetary systems. The best-fit orbital solution for the two planets in the 24 Sex system places them on orbits with periods that lie very close to 2:1 commensurability, while that for the HD 200964 system places the two planets therein in orbits whose periods lie close to a 4:3 commensurability. In both cases, the proposed best-fit orbits are mutually crossing-a scenario that is only dynamically feasible if the planets are protected from close encounters by the effects of mutual mean-motion resonance (MMR). Our simulations reveal that the best-fit orbits for both systems lie within narrow islands of dynamical stability, and are surrounded by much larger regions of extreme instability. As such, we show that the planets are only feasible if they are currently trapped in mutual MMR-the 2:1 resonance in the case of 24 Sex b and c, and the 4:3 resonance in the case of HD 200964 b and c. In both cases, the region of stability is strongest and most pronounced when the planetary orbits are mutually coplanar. As the inclination of planet c with respect to planet b is increased, the stability of both systems rapidly collapses.
Robert A. Herrmann
2008-02-13T23:59:59.000Z
In this paper, the modern theory of infinitesimals is applied to the General Relativity metric dS and its geometric and physical meanings are rigorously investigated. Employing results obtained via the time-dependent Schrodinger equation, gravitational time-dilation expressions are obtained and are shown to be caused by gravitationally altered photon interactions with atomic structures.
Strazza, Ernesto (Strazza Silva)
2014-01-01T23:59:59.000Z
This thesis provides a new perspective in trend analysis with the acknowledgement of individuals as carriers of trends and susceptible to influence simultaneously by a trend's perceived significance and by external effects ...
DYNAMICAL SENSITIVITY ANALYSIS OF TROPICAL CYCLONE STEERING AND GENESIS USING AN ADJOINT MODEL
Wisconsin at Madison, University of
the capability to grow through barotropic conversion of energy from a persistent low-level zonal jet sensitivity analysis. Physical interpretation of sensitivity gradients is complicated by several factors
Economic growth, convergence and the HIV/AIDS epidemic: a cross-country panel data analysis
Smith, Joel Benjamin Edmund
2011-07-05T23:59:59.000Z
This thesis presents an analysis of the dynamic process of economic growth, national welfare and the HIV/AIDS epidemic. An assessment of the methodological designs of applied growth research is undertaken in order to ...
Analysis of Block Preconditioners for Models of Coupled Magma/Mantle Dynamics
Rhebergen, Sander; Wells, Garth N.; Katz, Richard F.; Wathen, Andrew J.
2014-08-19T23:59:59.000Z
F08, 76M10, 86A17, 86-08 DOI. 10.1137/130946678 1. Introduction. The mantle of Earth extends from the bottom of the crust to the top of the iron core, some 3000 km below. Mantle rock, composed of silicate min- erals, behaves as an elastic solid... -dimensional, magma/mantle dynamics of subduction, even though this is an area of active research [22, 39]. Such models require highly refined compu- tational meshes, resulting in very large systems of algebraic equations. To solve these systems efficiently, iterative...
Materny, Arnulf; Konradi, Jakow; Namboodiri, Vinu; Namboodiri, Mahesh; Scaria, Abraham [Jacobs University Bremen, School of Science and Engineering Campus Ring 1, 28759 Bremen (Germany)
2008-11-14T23:59:59.000Z
The use of four-wave mixing techniques in femtosecond time-resolved spectroscopy has considerable advantages. Due to the many degrees of freedom offered e.g. by coherent anti-Stokes Raman scattering (CARS), the dynamics even of complex systems can be analyzed in detail. Using pulse shaping techniques in combination with a self-learning loop approach, molecular mode excitation can be controlled very efficiently in a multi-photon excitation process. Results obtained from the optimal control of CARS on {beta}-carotene are discussed.
Quantum Chemical Analysis of the Excited State Dynamics of Hydrated Electrons
P. O. J. Scherer; Sighart F. Fischer
2006-02-01T23:59:59.000Z
Quantum calculations are performed for an anion water cluster representing the first hydration shell of the solvated electron in solution. The absorption spectra from the ground state, the instant excited states and the relaxed excited states are calculated including CI-SD interactions. Analytic expressions for the nonadiabatic relaxation are presented. It is shown that the 50fs dynamics recently observed after s->p excitation is best accounted for if it is identified with the internal conversion, preceded by an adiabatic relaxation within the excited p state. In addition, transient absorptions found in the infrared are qualitatively reproduced by these calculations .
UNL Core for Applied Genomics and Ecology
Farritor, Shane
UNL Core for Applied Genomics and Ecology Bioinformatics training Roche 454 GS-FLX Registration, Microbiomes, Variant Analysis, Whole Genomes, Transcriptomes Data Analysis and Statistics CAGE database and employer. University of Nebraska-Lincoln*Core for Applied Genomics and Ecology* 323 Filley Hall *Lincoln
Fuentes, Jose L., S.M. Massachusetts Institute of Technology
2011-01-01T23:59:59.000Z
Using an industry analysis framework, this thesis analyzes whether the recently established Commercial Aircraft Corporation of China (Comac) is likely to break the Boeing-Airbus duopoly in the industry of large commercial ...
Amir M. Rahmani; Yang Shao; Mehlam Jupiterwala; Carlos E. Colosqui
2015-04-13T23:59:59.000Z
Plane Poiseuille flow past a nanoscale cylinder that is arbitrarily confined (i.e., symmetrically or asymmetrically confined) in a slit channel is studied via hydrodynamic lubrication theory and molecular dynamics simulations, considering cases where the cylinder remains static or undergoes thermal motion. Lubrication theory predictions for the drag force and volumetric flow rate are in close agreement with molecular dynamics simulations of flows having molecularly thin lubrication gaps, despite the presence of significant structural forces induced by the crystalline structure of the modeled solid. While the maximum drag force is observed in symmetric confinement, i.e., when the cylinder is equidistant from both channel walls, the drag decays significantly as the cylinder moves away from the channel centerline and approaches a wall. Hence, significant reductions in the mean drag force on the cylinder and hydraulic resistance of the channel can be observed when thermal motion induces random off-center displacements. Analytical expressions and numerical results in this work provide useful insights into the hydrodynamics of colloidal solids and macromolecules in confinement.
Wu, T; Paul Blanton, P; Kurt Eberl, K
2007-07-09T23:59:59.000Z
This paper presents a finite-element technique to simulate the structural responses and to evaluate the cumulative damage of a radioactive material packaging requiring bolt closure-tightening torque and subjected to the scenarios of the Hypothetical Accident Conditions (HAC) defined in the Code of Federal Regulations Title 10 part 71 (10CFR71). Existing finite-element methods for modeling closure stresses from bolt pre-load are not readily adaptable to dynamic analyses. The HAC events are required to occur sequentially per 10CFR71 and thus the evaluation of the cumulative damage is desirable. Generally, each HAC event is analyzed separately and the cumulative damage is partially addressed by superposition. This results in relying on additional physical testing to comply with 10CFR71 requirements for assessment of cumulative damage. The proposed technique utilizes the combination of kinematic constraints, rigid-body motions and structural deformations to overcome some of the difficulties encountered in modeling the effect of cumulative damage. This methodology provides improved numerical solutions in compliance with the 10CFR71 requirements for sequential HAC tests. Analyses were performed for the Bulk Tritium Shipping Package (BTSP) designed by Savannah River National Laboratory to demonstrate the applications of the technique. The methodology proposed simulates the closure bolt torque preload followed by the sequential HAC events, the 30-foot drop and the 30-foot dynamic crush. The analytical results will be compared to the package test data.
Paris-Sud XI, Université de
Reduction, Centre Manifold, Robust Analysis, Uncertainty Propagation, Polynomial chaos, Non-intrusive to compute the deterministic components called stochastic modes in an intrusive and a non intrusive manner while random components are concentrated in the polynomial basis used. Non intrusive procedures
A Computational Analysis Framework for Molecular Cell Dynamics: Case-Study of Exocytosis
Gu, Xun
is that in vivo system regulation is complex. Meanwhile, many kinetic rates are unknown, making global system analysis intractable in practice. In this article, we demonstrate a computational pipeline to help solve regulation) from limited in vitro experimental data, which fit well with the reports by the conventional
Schubert, Sebastian
2015-01-01T23:59:59.000Z
One of the most relevant weather regimes in the mid latitudes atmosphere is the persistent deviation from the approximately zonally symmetric jet stream to the emergence of so-called blocking patterns. Such configurations are usually connected to exceptional local stability properties of the flow which come along with an improved local forecast skills during the phenomenon. It is instead extremely hard to predict onset and decay of blockings. Covariant Lyapunov Vectors (CLVs) offer a suitable characterization of the linear stability of a chaotic flow, since they represent the full tangent linear dynamics by a covariant basis which explores linear perturbations at all time scales. Therefore, we will test whether CLVs feature a signature of the blockings. We examine the CLVs for a quasi-geostrophic beta-plane two-layer model in a periodic channel baroclinically driven by a meridional temperature gradient $\\Delta T$. An orographic forcing enhances the emergence of localized blocked regimes. We detect the blockin...
Dynamics of chiral oscillations - A comparative analysis with spin-flipping
Alex E. Bernardini
2013-01-04T23:59:59.000Z
Chiral oscillation as well as spin flipping effects correspond to quantum phenomena of fundamental importance in the context of particle physics and, in particular, of neutrino physics. From the point of view of first quantized theories, we are specifically interested in appointing the differences between chirality and helicity by obtaining their dynamic equations for a fermionic Dirac-type particle (neutrino). We also identify both effects when the non-minimal coupling with an external (electro)magnetic field in the neutrino interacting Lagrangian is taken into account. We demonstrate that, however, there is no constraint between chiral oscillations, when it takes place in vacuum, and the process of spin flipping related to the helicity quantum number, which does not take place in vacuum. To conclude, we show that the origin of chiral oscillations (in vacuum) can be interpreted as position very rapid oscillation projections onto the longitudinal direction of momentum.
Light-Front Dynamic Analysis of Bound States in Scalar Field Model
Chueng-Ryong Ji; Yukihisa Tokunaga
2012-05-16T23:59:59.000Z
The light-front dynamics (LFD) of the scalar field model theory is analyzed to solve the two-body bound-state problem. The light-front two-body bound-state equation is extended to the full LFD kernel including the ladder, cross-ladder, stretched-box, and particle-antiparticle creation/annihilation effects to study the contributions of higher Fock-states. The light-front two-body equation is also modified by the term corresponding to the self-energy corrections and counter-terms. Using the variational principle, we obtain the numerical result of the binding energy B versus the coupling constant \\alpha\\ for various mass ratios of the constituent particles including the cases of non-zero exchange particle mass. We also discuss the correlation between the mass spectrum and the corresponding bound-state wavefunction.
Analysis of heat release dynamics in an internal combustion engine using multifractals and wavelets
Sen, Asok K [Indiana University; Litak, Grzegorz [Technical University of Lublin; FINNEY, Charles E A [ORNL; Daw, C Stuart [ORNL; Wagner, Robert M [ORNL
2010-01-01T23:59:59.000Z
In this paper we analyze data from previously reported experimental measurements of cycle-to-cycle combustion variations in a lean-fueled, multi-cylinder spark-ignition (SI) engine. We characterize the changes in the observed combustion dynamics with as-fed fuel air ratio using conventional histograms and statistical moments, and we further characterize the shifts in combustion complexity in terms of multifractals and wavelet decomposition. Changes in the conventional statistics and multifractal structure indicate trends with fuel air ratio that parallel earlier reported observations. Wavelet decompositions reveal persistent, non-stochastic oscillation modes at higher fuel air ratios that were not obvious in previous analyses. Recognition of these long-time-scale, non-stochastic oscillations is expected to be useful for improving modelling and control of engine combustion variations and multi-cylinder balancing.
,
2015-01-01T23:59:59.000Z
We present a sophisticated likelihood reconstruction algorithm for shower-image analysis of imaging Cherenkov telescopes. The reconstruction algorithm is based on the comparison of the camera pixel amplitudes with the predictions from a Monte Carlo based model. Shower parameters are determined by a maximisation of a likelihood function. Maximisation of the likelihood as a function of shower fit parameters is performed using a numerical non-linear optimisation technique. A related reconstruction technique has already been developed by the CAT and the H.E.S.S. experiments, and provides a more precise direction and energy reconstruction of the photon induced shower compared to the second moment of the camera image analysis. Examples are shown of the performance of the analysis on simulated gamma-ray data from the VERITAS array.
Hahn, Steven
2012-07-20T23:59:59.000Z
Modern calculations are becoming an essential, complementary tool to inelastic x-ray scattering studies, where x-rays are scattered inelastically to resolve meV phonons. Calculations of the inelastic structure factor for any value of Q assist in both planning the experiment and analyzing the results. Moreover, differences between the measured data and theoretical calculations help identify important new physics driving the properties of novel correlated systems. We have used such calculations to better and more e#14;ciently measure the phonon dispersion and elastic constants of several iron pnictide superconductors. This dissertation describes calculations and measurements at room temperature in the tetragonal phase of CaFe{sub 2}As{sub 2} and LaFeAsO. In both cases, spin-polarized calculations imposing the antiferromagnetic order present in the low-temperature orthorhombic phase dramatically improves the agreement between theory and experiment. This is discussed in terms of the strong antiferromagnetic correlations that are known to persist in the tetragonal phase. In addition, we discuss a relatively new approach called self-consistent ab initio lattice dynamics (SCAILD), which goes beyond the harmonic approximation to include phonon-phonon interactions and produce a temperature-dependent phonon dispersion. We used this technique to study the HCP to BCC transition in beryllium.
Dynamic simulations of geologic materials using combined FEM/DEM/SPH analysis
Morris, J P; Johnson, S M
2008-03-26T23:59:59.000Z
An overview of the Lawrence Discrete Element Code (LDEC) is presented, and results from a study investigating the effect of explosive and impact loading on geologic materials using the Livermore Distinct Element Code (LDEC) are detailed. LDEC was initially developed to simulate tunnels and other structures in jointed rock masses using large numbers of polyhedral blocks. Many geophysical applications, such as projectile penetration into rock, concrete targets, and boulder fields, require a combination of continuum and discrete methods in order to predict the formation and interaction of the fragments produced. In an effort to model this class of problems, LDEC now includes implementations of Cosserat point theory and cohesive elements. This approach directly simulates the transition from continuum to discontinuum behavior, thereby allowing for dynamic fracture within a combined finite element/discrete element framework. In addition, there are many application involving geologic materials where fluid-structure interaction is important. To facilitate solution of this class of problems a Smooth Particle Hydrodynamics (SPH) capability has been incorporated into LDEC to simulate fully coupled systems involving geologic materials and a saturating fluid. We will present results from a study of a broad range of geomechanical problems that exercise the various components of LDEC in isolation and in tandem.
Dynamic Faraday cup signal analysis and the measurement of energetic ions emitted by plasma focus
Pestehe, S. J., E-mail: sjpest@tabrizu.ac.ir; Mohammadnejad, M. [Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Tabriz 5167618949 (Iran, Islamic Republic of) [Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Tabriz 5167618949 (Iran, Islamic Republic of); Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz (Iran, Islamic Republic of); Irani Mobaraki, S. [Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Tabriz 5167618949 (Iran, Islamic Republic of)] [Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, Tabriz 5167618949 (Iran, Islamic Republic of)
2014-03-15T23:59:59.000Z
A theoretical model is developed to study the signals from a typical dynamic Faraday cup, and using this model the output signals from this structure are obtained. A detailed discussion on the signal structure, using different experimental conditions, is also given. It is argued that there is a possibility of determining the total charge of the generated ion pulse, the maximum velocity of the ions, ion velocity distribution, and the number of ion species for mixed working gases, under certain conditions. In addition, the number of different ionization stages, the number of different pinches in one shot, and the number of different existing acceleration mechanisms can also be determined provided that the mentioned conditions being satisfied. An experiment is carried out on the Filippov type 90?kJ Sahand plasma focus using Ar as the working gas at the pressure of 0.25?Torr. The data from a typical shot are fitted to a signal from the model and the total charge of the related energetic ion pulse is deduced using the values of the obtained fit parameters. Good agreement between the obtained amount of the total charge and the values obtained during other experiments on the same plasma focus device is observed.
Integrated Dynamic Analysis of Floating Offshore Wind Turbines Bjřrn Skaare*, Tor David Hanson on land and in shallow waters offshore. Wind turbines at sea are a good solution because achieve better energy efficiency at sea than on land. Presently, offshore wind turbines are installed
Paris-Sud XI, Université de
1 A study of localisation in dual phase high-strength steels under dynamic loading using digital of an elasto-viscoplastic constitutive model for the dual-phase steel is provided in terms of its ability for the shell element analysis. Keywords: high-speed photography, localisation, dual-phase high strength-steel
Non-Linear Dynamics Analysis of a PWR with Up-to-date Fuel Design
Riverola Gurruchaga, Javier [ENUSA Industrias Avanzadas S.A., Santiago Rusinol 12, 28040 Madrid (Spain)
2007-07-01T23:59:59.000Z
The Lyapunov stability theorems are applied to a simplified system of non-linear differential equations representative of a current 3 loop /12 feet contemporary PWR (Generation II) with up-to-date 17x17 lattice fuel design. The one-speed non-linear point kinetics model with six delayed neutron groups and lumped parameter heat transfer equations in the fuel rod and coolant along with a reactivity function with Doppler and moderator feedback effects is considered. First, local asymptotic stability is demonstrated at a variety of equilibrium state-points ranging from start-up to 150% nominal power. Then, a Lyapunov V function is found with the mathematical condition for sign definiteness and the stability region of attraction around the equilibrium HFP state is obtained. This study is complemented with the application of the Welton criterion for non linear kinetics and linear feedback in the frequency domain. As expected and consistently with Reactor Physics theory and experience, the strong asymptotic stable trend of a PWR is confirmed again for all analyzed conditions. This method is general and adaptable to other fuel assembly designs and reactor types. (authors)
Molecular dynamics of liquid benzene via femtosecond pulses laser excitation
Paris-Sud XI, Université de
1749 Molecular dynamics of liquid benzene via femtosecond pulses laser excitation J. Etchepare, G moléculaires. Abstract. 2014 We analyse the complex response of liquid benzene to the applied 45 fs FHWM new results obtained by the transient grating temporal behaviour analysis of benzene, a molecule
YANG, CHIN-RANG [NHLBI, NIH] [NHLBI, NIH
2013-12-11T23:59:59.000Z
Astronauts and workers in nuclear plants who repeatedly exposed to low doses of ionizing radiation (IR, <10 cGy) are likely to incur specific changes in signal transduction and gene expression in various tissues of their body. Remarkable advances in high throughput genomics and proteomics technologies enable researchers to broaden their focus from examining single gene/protein kinetics to better understanding global gene/protein expression profiling and biological pathway analyses, namely Systems Biology. An ultimate goal of systems biology is to develop dynamic mathematical models of interacting biological systems capable of simulating living systems in a computer. This Glue Grant is to complement Dr. Boothman’s existing DOE grant (No. DE-FG02-06ER64186) entitled “The IGF1/IGF-1R-MAPK-Secretory Clusterin (sCLU) Pathway: Mediator of a Low Dose IR-Inducible Bystander Effect” to develop sensitive and quantitative proteomic technology that suitable for low dose radiobiology researches. An improved version of quantitative protein array platform utilizing linear Quantum dot signaling for systematically measuring protein levels and phosphorylation states for systems biology modeling is presented. The signals are amplified by a confocal laser Quantum dot scanner resulting in ~1000-fold more sensitivity than traditional Western blots and show the good linearity that is impossible for the signals of HRP-amplification. Therefore this improved protein array technology is suitable to detect weak responses of low dose radiation. Software is developed to facilitate the quantitative readout of signaling network activities. Kinetics of EGFRvIII mutant signaling was analyzed to quantify cross-talks between EGFR and other signaling pathways.
Sebastian Schubert; Valerio Lucarini
2015-08-17T23:59:59.000Z
One of the most relevant weather regimes in the mid latitudes atmosphere is the persistent deviation from the approximately zonally symmetric jet stream to the emergence of so-called blocking patterns. Such configurations are usually connected to exceptional local stability properties of the flow which come along with an improved local forecast skills during the phenomenon. It is instead extremely hard to predict onset and decay of blockings. Covariant Lyapunov Vectors (CLVs) offer a suitable characterization of the linear stability of a chaotic flow, since they represent the full tangent linear dynamics by a covariant basis which explores linear perturbations at all time scales. Therefore, we will test whether CLVs feature a signature of the blockings. We examine the CLVs for a quasi-geostrophic beta-plane two-layer model in a periodic channel baroclinically driven by a meridional temperature gradient $\\Delta T$. An orographic forcing enhances the emergence of localized blocked regimes. We detect the blocking events of the channel flow with a Tibaldi-Molteni scheme adapted to the periodic channel. When blocking occurs, the global growth rates of the fastest growing CLVs are significantly higher. Hence against intuition, globally the circulation is more unstable in blocked phases. Such an increase in the finite time Lyapunov exponents with respect to the long term average is attributed to stronger barotropic and baroclinic conversion in the case of high temperature gradients, while for low values of $\\Delta T$, the effect is only due to stronger barotropic instability. For the localization of the CLVs, we compare the meridionally averaged variance of the CLVs during blocked and unblocked phases. We find that on average the variance of the CLVs is clustered around the center of blocking. These results show that the blocked flow affects all time scales and processes described by the CLVs.
Dynamical systems probabilistic risk assessment.
Denman, Matthew R.; Ames, Arlo Leroy
2014-03-01T23:59:59.000Z
Probabilistic Risk Assessment (PRA) is the primary tool used to risk-inform nuclear power regulatory and licensing activities. Risk-informed regulations are intended to reduce inherent conservatism in regulatory metrics (e.g., allowable operating conditions and technical specifications) which are built into the regulatory framework by quantifying both the total risk profile as well as the change in the risk profile caused by an event or action (e.g., in-service inspection procedures or power uprates). Dynamical Systems (DS) analysis has been used to understand unintended time-dependent feedbacks in both industrial and organizational settings. In dynamical systems analysis, feedback loops can be characterized and studied as a function of time to describe the changes to the reliability of plant Structures, Systems and Components (SSCs). While DS has been used in many subject areas, some even within the PRA community, it has not been applied toward creating long-time horizon, dynamic PRAs (with time scales ranging between days and decades depending upon the analysis). Understanding slowly developing dynamic effects, such as wear-out, on SSC reliabilities may be instrumental in ensuring a safely and reliably operating nuclear fleet. Improving the estimation of a plant's continuously changing risk profile will allow for more meaningful risk insights, greater stakeholder confidence in risk insights, and increased operational flexibility.
HOUSING GUARANTEE Apply Online
Mease, Kenneth D.
THE UCI HOUSING GUARANTEE Apply Online 1 Log in to your MyAdmission account via the tab of Admission fee. 3 Complete the Online Housing Application and pay the $20 non-refundable fee. Freshmen apply for the residence halls. Transfer students apply for Arroyo Vista theme houses and on-campus apartments. Students 25
MATHMATICS & APPLIED STATISTICS
Frey, Jesse C.
MATHMATICS & APPLIED STATISTICS Graduate Studies in Build Your Future with Graduate Study in Mathematics or Applied Statistics Our graduate programs can help you advance your career in education will deepen your knowledge and prepare you for further study. The Master of Science in Applied Statistics
Turchin, Peter
2005-01-01T23:59:59.000Z
social, and political structures of agrarian societies), weinstability in agrarian states. Structure and Dynamics 1(1):
Bravo de la Parra, Rafael
Effects of density dependent sex allocation on the dynamics of a simultaneous hermaphroditic Available online 22 December 2009 Keywords: Sex-allocation model Sex-structured population dynamics Density model describing the dynamics of a population where sex allocation remains flexible throughout adult
The following sample of the publications has been made available to you by members of the Applied faculty through their personal homepages. Prof. Zhiqiang
Selecting and Applying Interfacings
2006-05-01T23:59:59.000Z
Selecting and using interfacing correctly is an important component of garment construction. The various types of interfacing are described and methods of applying them are discussed in detail....
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
CCS CCS-7 Applied Computer Science Innovative co-design of applications, algorithms, and architectures in order to enable scientific simulations at extreme scale Leadership...
INTRODUCTION APPLIED GEOPHYSICS
Merriam, James
GEOL 384.3 INTRODUCTION TO APPLIED GEOPHYSICS OUTLINE INTRODUCTION TO APPLIED GEOPHYSICS GEOL 384 unknowns; the ones we don't know we don't know. And if one looks throughout the history of geophysics he didn't really say geophysics. He said, " ... our country and other free countries ...". But I am
Freeman, Walter J III
2009-01-01T23:59:59.000Z
dynamic structures that emerge in cortical activity from modulation (AM) patterns emerge in the ECoG, which are
Demkin, V. P.; Mel'nichuk, S. V. [National Research Tomsk State University, 36, Lenin Ave., 634050 Tomsk (Russian Federation)
2014-09-15T23:59:59.000Z
In the present work, results of investigations into the dynamics of secondary electrons with helium atoms in the presence of the reverse electric field arising in the flare of a high-voltage pulsed beam-type discharge and leading to degradation of the primary electron beam are presented. The electric field in the discharge of this type at moderate pressures can reach several hundred V/cm and leads to considerable changes in the kinetics of secondary electrons created in the process of propagation of the electron beam generated in the accelerating gap with a grid anode. Moving in the accelerating electric field toward the anode, secondary electrons create the so-called compensating current to the anode. The character of electron motion and the compensating current itself are determined by the ratio of the field strength to the concentration of atoms (E/n). The energy and angular spectra of secondary electrons are calculated by the Monte Carlo method for different ratios E/n of the electric field strength to the helium atom concentration. The motion of secondary electrons with threshold energy is studied for inelastic collisions of helium atoms and differential analysis is carried out of the collisional processes causing energy losses of electrons in helium for different E/n values. The mechanism of creation and accumulation of slow electrons as a result of inelastic collisions of secondary electrons with helium atoms and selective population of metastable states of helium atoms is considered. It is demonstrated that in a wide range of E/n values the motion of secondary electrons in the beam-type discharge flare has the character of drift. At E/n values characteristic for the discharge of the given type, the drift velocity of these electrons is calculated and compared with the available experimental data.
Lajimi, Seyed Amir Mousavi
2014-01-01T23:59:59.000Z
The nonlinear dynamics of a microbeam-rigid body gyroscope are investigated by using a continuation method. To study the nonlinear dynamics of the system, the Lagrangian of the system is discretized and the reduced-order model is obtained. By using the continuation method, the frequency-response curves are computed and the stability of response is determined.
Essays in applied microeconomics
Aron-Dine, Aviva
2012-01-01T23:59:59.000Z
This dissertation consists of three chapters on topics in applied microeconomics. In the first chapter. I investigate whether voters are more likely to support additional spending on local public services when they perceive ...
Analytical Chemistry Applied Mathematics
Heller, Barbara
Mathematics Education Mechanical & Aerospace Engineering Molecular Biochemistry & Biophysics NetworkAnalytical Chemistry Applied Mathematics Architectural Engineering Architecture Architecture/Integrated Building Delivery Biology Biological Engineering Biomedical Engineering Biomedical Imaging & Signals
Sandia Energy - Applied & Computational Math
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Applied & Computational Math Home Energy Research Advanced Scientific Computing Research (ASCR) Applied & Computational Math Applied & Computational Mathcwdd2015-03-26T13:34:5...
Neutron activation analysis applied to perspiration electrolytes
McAndrew, Robert Gavin
1969-01-01T23:59:59.000Z
steel "foil punch" about 7 /8-inch in diameter, which was cleaned thoroughly wit h alcohol and distilled water prior to usc. The disl s were stored in sealed polyethylene vials until used. It vtas recognized thai evaporation losses from the filter...
Integrated systems analysis applied to environmental remediation
Thayer, G.R.; Hardie, R.W.; Catherwood, R.; Springer, E.P.
1997-12-31T23:59:59.000Z
At the request of the Congressional Task Force on the Salton Sea and the Salton Sea Authority, the authors examined various technologies that have been proposed to reduce the decline in the Salton Sea. The primary focus of the technologies was to reduce the salinity of the Salton Sea, with secondary objectives of maintaining the present shoreline and to have a minimum cost. The authors found that two technologies, pump-out and diking, could provide the required salinity reduction. The pump-out option would result in a smaller Sea while to diking option would create a high salinity impoundment area in the Sea. The costs for the two options were similar. Desalination and pump-in; pump-out options were rejected because of high costs and because they did not provide a sufficient reduction in the salinity of the Salton Sea. The end product of the project was testimony before the Subcommittee on Water and Power, U.S. House of Representatives Committee on Resources, given October 3, 1997.
Conductivity as applied to water analysis
Godfrey, Truman M.
1913-05-15T23:59:59.000Z
ed "by a small hand driven dynamo, controlled by a constant speed clutch. The conductivity is read directly on a scale in units of the recip rocal of one megohm. The scale is corrected for hack E• M.F• due to gas polarization. A table... is given below. With the exception of the value for HC03~, which was calculated from measurements made in this laboratory, all the table was taken from Kohlrausch. Ionic Conductivities at 18°C. .001 g. CI" 64.4 NOi 59.3 1/2 SQi~ 64.0 1/2 COr- 69...
Tensor analysis applied to symmetrical components
Iriarte, Modesto
1949-01-01T23:59:59.000Z
tioni They assume values from 1 to H respeotivelya Further, assume that Z&a are oomponents of a tensor 5, then the set of equations (15b) oan also be written Qj = 1 Zjk (& gc) where again repeated indioes indioate susmation and j assusm values from... is the determinant of (36) i. ei, of 2 ~ 1 ol ~ &~&E~ ? (1st-Zaa-2 ac)c(pgd) - ( Z c a ? Za b + Z a&) C~ c Zoa. + Zac Zb& C? c. Coo~) ? (Zc4 ? Zob + Zoc) &c (q oc. ) ths ourrents in the individual ooils are given by the set of equations (isa). The problem has...
Taylor, L.L.; Wilson, J.R.; Sanchez, L.C.; Aguilar, R.; Trellue, H.R.; Cochrane, K.; Rath, J.S.
1998-10-01T23:59:59.000Z
The US Department of Energy Office of Environmental Management's (DOE/EM's) National Spent Nuclear Fuel Program (NSNFP), through a collaboration between Sandia National Laboratories (SNL) and Idaho National Engineering and Environmental Laboratory (INEEL), is conducting a systematic Nuclear Dynamics Consequence Analysis (NDCA) of the disposal of SNFs in an underground geologic repository sited in unsaturated tuff. This analysis is intended to provide interim guidance to the DOE for the management of the SNF while they prepare for final compliance evaluation. This report presents results from a Nuclear Dynamics Consequence Analysis (NDCA) that examined the potential consequences and risks of criticality during the long-term disposal of spent nuclear fuel owned by DOE-EM. This analysis investigated the potential of post-closure criticality, the consequences of a criticality excursion, and the probability frequency for post-closure criticality. The results of the NDCA are intended to provide the DOE-EM with a technical basis for measuring risk which can be used for screening arguments to eliminate post-closure criticality FEPs (features, events and processes) from consideration in the compliance assessment because of either low probability or low consequences. This report is composed of an executive summary (Volume 1), the methodology and results of the NDCA (Volume 2), and the applicable appendices (Volume 3).
Ammar, Hany H.
Analysis (FMEA) technique is a systematic approach that details all possible failure modes and identifies
Lee, M.L.
Dynamic Mechanical Analyzer (DMA) was used to study the frequency dependence of storage and loss modulus of amorphous Pd??Ni??Cu??P?? alloy over a broad frequency range around its glass transition temperature. The amorphous ...
Goel, Piyush
2010-10-12T23:59:59.000Z
A Web-server farm is a specialized facility designed specifically for housing Web servers catering to one or more Internet facing Web sites. In this dissertation, stochastic dynamic programming technique is used to obtain the optimal admission...
LaBry, Zachary Alexander
2015-01-01T23:59:59.000Z
One of the most difficult challenges facing the development of modern gas turbines-for power generation, and propulsion-is the mitigation of dynamic instabilities in the presence of efficiency and emissions constraints. ...
Price, James F.
This collection of three essays was developed from the author's experience teaching Fluid Dynamics of the Atmosphere and Ocean, 12.800, offered to graduate students entering the MIT/WHOI Joint Program in Oceanography. The ...
Prabir Rudra; Chayan Ranjit; Sujata Kundu
2013-03-19T23:59:59.000Z
Motivated by some previous works of Rudra et al we set to explore the background dynamics when dark energy in the form of New Variable Modified Chaplygin gas is coupled to dark matter with a suitable interaction in the universe described by brane cosmology. The main idea is to find out the efficiency of New variable modified Chaplygin gas to play the role of DE. As a result we resort to the technique of comparison with standard dark energy models. Here the RSII brane model have been considered as the gravity theory. An interacting model is considered in order to search for a possible solution of the cosmic coincidence problem. A dynamical system analysis is performed because of the high complexity of the system . The statefinder parameters are also calculated to classify the dark energy model. Graphs and phase diagrams are drawn to study the variations of these parameters and get an insight into the effectiveness of the dark energy model. It is also seen that the background dynamics of New Variable Modified Chaplygin gas is consistent with the late cosmic acceleration. After performing an extensive mathematical analysis, we are able to constrain the parameters of new variable modified Chaplygin gas as $mNew Variable Modified Chaplygin gas is not as effective as other Chaplygin gas models to play the role of dark energy.
Boyer, Edmond
Sensitivity Analysis as an Early Warning for System's Critical Transition Tatiana Baumuratova 1, 2, * , Simona by our toolbox is an early warning that a system is approaching a critical transition. We illustrate systems like climate, economy, ecosystems it is highly desirable to identify indicators serving as early
Miller, Ari Parsons
2011-01-01T23:59:59.000Z
Biomimetics is the study and analysis of natural systems to inform engineering design and technology development. Through interdisciplinary research and analysis of natural phenomena, engineers are able to gain valuable ...
FUNDED BY CALL FOR SUSTAINABILITY RESEARCH STUDENT WHO CAN APPLY Undergraduate and graduate Participate in the Global Change & Sustainability Center's Research Symposium; attend workshops with faculty or publish in the U's student-run sustainability publication to be released in May 2014. Are you conducting
APPLYING RESEARCH ON METACOGNITION
School of Medicine01/09/14 #12;Define metacognition and explain its importance in teaching and learning, understand key genetic terms.) Next, apply knowledge to determine inheritance patterns and to formulate students presume that a best response strategy is to relate everything they know about a subject figuring
Nov 11, 2009 ... Location: Engineering (Periodicals) ... wave propagation in such systems is examined in reference (4). Gassman (5, 6) has ... Now Research Scientist at Missile. Systems ... Presented at the Applied Mechanics Division Summer Conference,. Berkeley ..... This will be true in some cases for a water- saturated ...
Applied Microbiology and Biotechnology
Alvarez-Cohen, Lisa
1 23 Applied Microbiology and Biotechnology ISSN 0175-7598 Appl Microbiol Biotechnol DOI 10.1007/s-Cohen #12;1 23 Your article is protected by copyright and all rights are held exclusively by Springer in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version
HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution) Model Analysis HyDIVE (Hydrogen Dynamic Infrastructure and Vehicle Evolution) Model Analysis Presentation by NREL's...
Nerukh, Dmitry
Complexity of classical dynamics of molecular systems. II. Finite statistical complexity of a water complexity. One of the advantages of this approach is that it is based on informatic-theoretical analysis; accepted 9 September 2002 The computational mechanics approach has been applied to the orientational
Stoffel, Markus
Outburst hydrograph s u m m a r y Although moraine dams are inherently prone to failure because and the application of a dynamic dam break model. Results indicate that the moraine failure was caused most probably erosion and finally to dam failure. The lake volume of ca. 10 Â 106 m3 was released in ca. 3 h, producing
Eom, Taesung
2013-08-01T23:59:59.000Z
................................................................................................................... 1? 1.2? Concept of spar and FPSO ..................................................................................... 4? 1.3? Sub-critical local dynamic buckling of SCR .......................................................... 5? 1.4? Literature... .................................................................................................... 9? 2.1.1? Spar system .................................................................................................. 9? 2.1.2? FPSO system .............................................................................................. 15? 2...
Presilla, Carlo
semiconductor double bar- riers1, in recent years many groups have studied the physics and device application of RT in semiconductor nanostructures2 · MBE allows one to control the layer thickness and tune its and demonstrated that the dynamical storage of electrons in the well leads to bistability in the current voltage
Hierarchical Network Structure Promotes Dynamical Robustness
Cameron Smith; Raymond S. Puzio; Aviv Bergman
2014-12-01T23:59:59.000Z
The analysis of dynamical systems that attempts to model chemical reaction, gene-regulatory, population, and ecosystem networks all rely on models having interacting components. When the details of these interactions are unknown for biological systems of interest, one effective approach is to study the dynamical properties of an ensemble of models determined by evolutionary constraints that may apply to all such systems. One such constraint is that of dynamical robustness. Despite previous investigations, the relationship between dynamical robustness-an important functional characteristic of many biological systems-and network structure is poorly understood. Here we analyze the stability and robustness of a large class of dynamical systems and demonstrate that the most hierarchical network structures, those equivalent to the total ordering, are the most robust. In particular, we determine the probability distribution of robustness over system connectivity and show that robustness is maximized by maximizing the number of links between strongly connected components of the graph representing the underlying system connectivity. We demonstrate that this can be understood in terms of the fact that permutation of strongly connected components is a fundamental symmetry of dynamical robustness, which applies to networks of any number of components and is independent of the distribution from which the strengths of interconnection among components are sampled. The classification of dynamical robustness based upon a purely topological property provides a fundamental organizing principle that can be used in the context of experimental validation to select among models that break or preserve network hierarchy. This result contributes to an explanation for the observation of hierarchical modularity in biological networks at all scales.
Bondarenko, S V; Novikova, E A [Russian Federal Nuclear Center 'All-Russian Research Institute of Experimental Physics', Sarov, Nizhnii Novgorod region (Russian Federation); Dolgoleva, G V [M.V. Keldysh Institute for Applied Mathematics, Russian Academy of Sciences, Moscow (Russian Federation)
2014-03-28T23:59:59.000Z
We report the results of numerical analysis of radiation dynamics (laser absorption and X-ray generation) by using SNDLIRA code in a combined box used in the X-ray opacity measurements on the 'Iskra-5' facility (laser radiation wavelength, ? = 0.66 ?m; laser pulse duration, ?{sub 0.5} ? 0.6 ns; and energy, 900 J). Combined boxes used in these experiments comprised three sections: two illuminators delivering laser radiation and a central diagnostic section with a test sample. We have proposed a scheme for step-by-step calculation of the heating dynamics of the sample under study in a three-section hohlraum. Two designs of a combined box, which differ in the ways the laser radiation is injected, are discussed. It is shown that the axial injection of the beams results in intense secondary laser irradiation of the illuminator edge which leads to its partial disruption and penetration of laser radiation into the central diagnostic section. In this case the sample under study is exposed to additional uncontrolled action of scattered laser radiation. Such an undesirable action may be avoided by using the lateral injection of the beams through four holes on the lateral side of the illuminators. For the latter case we have calculated the heating dynamics for the sample and found an optimal time delay for an X-ray probe pulse. (interaction of laser radiation with matter. laser plasma)
Journal of Applied Mathematics and ISSN 1598-5865
Mohseni, Kamran
1 23 Journal of Applied Mathematics and Computing ISSN 1598-5865 J. Appl. Math. Comput. DOI 10 Society for Computational and Applied Mathematics. This e-offprint is for personal use only and shall mathematical and numerical analysis of the method applied to the one-dimensional Burgers' and Euler equations
ORISE: Applied health physics projects
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Applied health physics projects The Oak Ridge Institute for Science and Education (ORISE) provides applied health physics services to government agencies needing technical support...
Waggoner, L.O.
1998-02-05T23:59:59.000Z
The presentation focuses on some of the time-proven and new technologies being used to accomplish radiological work. These techniques can be applied at nuclear facilities to reduce radiation doses and protect the environment. The last reactor plants and processing facilities were shutdown and Hanford was given a new mission to put the facilities in a safe condition, decontaminate, and prepare them for decommissioning. The skills that were necessary to operate these facilities were different than the skills needed today to clean up Hanford. Workers were not familiar with many of the tools, equipment, and materials needed to accomplish:the new mission, which includes clean up of contaminated areas in and around all the facilities, recovery of reactor fuel from spent fuel pools, and the removal of millions of gallons of highly radioactive waste from 177 underground tanks. In addition, this work has to be done with a reduced number of workers and a smaller budget. At Hanford, facilities contain a myriad of radioactive isotopes that are 2048 located inside plant systems, underground tanks, and the soil. As cleanup work at Hanford began, it became obvious early that in order to get workers to apply ALARA and use hew tools and equipment to accomplish the radiological work it was necessary to plan the work in advance and get radiological control and/or ALARA committee personnel involved early in the planning process. Emphasis was placed on applying,ALARA techniques to reduce dose, limit contamination spread and minimize the amount of radioactive waste generated. Progress on the cleanup has,b6en steady and Hanford workers have learned to use different types of engineered controls and ALARA techniques to perform radiological work. The purpose of this presentation is to share the lessons learned on how Hanford is accomplishing radiological work.
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) | SciTech Connect Journal Article: X-ray lineARMParticipants AboutAncient Proteins Help Unravel areportsApplied Energy
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) | SciTech Connect Journal Article: X-ray lineARMParticipants AboutAncient Proteins Help Unravel areportsApplied
Puliafito, Vito, E-mail: vpuliafito@unime.it; Azzerboni, Bruno; Finocchio, Giovanni [Department of Electronic Engineering, Industrial Chemistry and Engineering, University of Messina, 98166 Messina (Italy); Torres, Luis [Department of Applied Physics, University of Salamanca, 37008 Salamanca (Spain); Ozatay, Ozhan [Department of Physics, Bogazici University, 34342 Bebek/Istanbul (Turkey); Hauet, Thomas [Institut Jean Lamour, Université de Lorraine-CNRS UMR 7198, 54506 Nancy (France)
2014-05-07T23:59:59.000Z
Dynamical bubble-like solitons have been recently investigated in nanocontact-based spin-torque oscillators with a perpendicular free layer. Those magnetic configurations can be excited also in different geometries as long as they consist of perpendicular materials. Thus, in this paper, a systematic study of the influence of both external field and high current on that kind of dynamics is performed for a spin-valve point-contact geometry where both free and fixed layers present strong perpendicular anisotropy. The usage of the topological density tool highlights the excitation of complex bubble/antibubble configurations. In particular, at high currents, a deformation of the soliton and its simultaneous shift from the contact area are observed and can be ascribable to the Oersted field. Results provide further detailed information on the excitation of solitons in perpendicular materials for application in spintronics, magnonics, and domain wall logic.
Mastorides, T; Rivetta, C.; Fox, J.D.; Winkle, D.Van; /SLAC; Tytelman, D.; /Dimtel, Redwood City
2008-07-07T23:59:59.000Z
A dynamics simulation model is used to estimate limits of performance of the Positron-Electron Project (PEP-II). The simulation captures the dynamics and technical limitations of the Low Level Radio Frequency (LLRF) system, the high-power RF components and the low-order mode coupled bunch longitudinal beam dynamics. Simulation results showing the effect of non-linearities on the LLRF loops, and studies of the effectiveness of technical component upgrades are reported, as well as a comparison of these results with PEP-II measurements. These studies have led to the estimation of limits and determining factors in the maximum stored current that the Low Energy Ring/High Energy Ring (LER/HER) can achieve, based on system stability for different RF station configurations and upgrades. In particular, the feasibility of the PEP-II plans to achieve the final goal in luminosity, which required an increase of the beam currents to 4A for LER and 2.2A for HER, is studied. These currents are challenging in part because they would push the longitudinal low-order beam mode stability to the limit, and the klystron forward power past a level of satisfactory margin. An acceptable margin is defined in this paper, which in turn determines the corresponding klystron forward power limitation.
Mass distribution of highly flattened galaxies and modified Newtonian dynamics
W. F. Kao
2006-06-10T23:59:59.000Z
Dynamics of spiral galaxies derived from a given surface mass density has been derived earlier in a classic paper. We try to transform the singular elliptic function in the integral into a compact integral with regular elliptic function. Solvable models are also considered as expansion basis for RC data. The result makes corresponding numerical evaluations easier and analytic analysis possible. It is applied to the study of the dynamics of Newtonian system and MOND as well. Careful treatment is shown to be important in dealing with the cut-off of the input data.
Reliability of dynamic systems under limited information.
Field, Richard V., Jr. (.,; .); Grigoriu, Mircea
2006-09-01T23:59:59.000Z
A method is developed for reliability analysis of dynamic systems under limited information. The available information includes one or more samples of the system output; any known information on features of the output can be used if available. The method is based on the theory of non-Gaussian translation processes and is shown to be particularly suitable for problems of practical interest. For illustration, we apply the proposed method to a series of simple example problems and compare with results given by traditional statistical estimators in order to establish the accuracy of the method. It is demonstrated that the method delivers accurate results for the case of linear and nonlinear dynamic systems, and can be applied to analyze experimental data and/or mathematical model outputs. Two complex applications of direct interest to Sandia are also considered. First, we apply the proposed method to assess design reliability of a MEMS inertial switch. Second, we consider re-entry body (RB) component vibration response during normal re-entry, where the objective is to estimate the time-dependent probability of component failure. This last application is directly relevant to re-entry random vibration analysis at Sandia, and may provide insights on test-based and/or model-based qualification of weapon components for random vibration environments.
Entanglement dynamics in chaotic systems
Ghose, Shohini [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Sanders, Barry C. [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Centre for Quantum Computer Technology, Macquarie University, Sydney, New South Wales (Australia)
2004-12-01T23:59:59.000Z
We study quantum chaos for systems with more than one degree of freedom, for which we present an analysis of the dynamics of entanglement. Our analysis explains the main features of entanglement dynamics and identifies entanglement-based signatures of quantum chaos. We discuss entanglement dynamics for a feasible experiment involving an atom in a magneto-optical trap and compare the results with entanglement dynamics for the well-studied quantum kicked top.
Mathematical analysis of the global dynamics of a model for HTLV-I infection and ATL progression
Li, Michael
cells, whose growth is assumed to follow a classical logistic growth function. Our analysis establishes retrovirus with reverse transcriptase activity that leads to a DNA copy of the viral genome. The viral DNA
APPLIED TECHNOLOGY Strategic Plan Summary
Heller, Barbara
SCHOOL OF APPLIED TECHNOLOGY Strategic Plan Summary #12;School of Applied Technology Strategic Plan Summary | 1 SCHOOL OF APPLIED TECHNOLOGY STRATEGIC PLAN SUMMARY MISSION STATEMENT The mission of the School of Applied Technology is to provide practical and industry relevant education in an environment
Advanced Multivariate Analysis Tools Applied to Surface Analysis.
Office of Scientific and Technical Information (OSTI)
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Applied Cathode Enhancement and
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm BiofuelinAnalysis ofAntonyaFederal(SC)FBerkeley Lab
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm BiofuelinAnalysis ofAntonyaFederal(SC)FBerkeley LabCCS Â» CCS-7
Ganapathy, V.
1982-01-01T23:59:59.000Z
Heat transfer principles are discussed with emphasis on the practical aspects of the problems. Correlations for heat transfer and pressure drop from several worldwide sources for flow inside and outside of tubes, including finned tubes are presented, along with design and performance calculations of heat exchangers economizers, air heaters, condensers, waste-heat boilers, fired heaters, superheaters, and boiler furnaces. Vibration analysis for tube bundles and heat exchangers are also discussed, as are estimating gas-mixture properties at atmospheric and elevated pressures and life-cycle costing techniques. (JMT)
D. A. Simakov
2015-04-28T23:59:59.000Z
In this article we study a particular method of detection of chirp signals from coalescing compact binary stars -- the so-called dynamical tuning, i.e. amplification of the signal via tracking of its instantaneous frequency by the tuning of the signal-recycled detector. A time-domain consideration developed for signal-recycled interferometers, in particular GEO 600, describes the signal and noise evolution in the non-stationary detector. Its non-stationarity is caused by motion of the signal recycling mirror, whose position defines the tuning of the detector. We prove that the shot noise from the dark port and optical losses remains white. The analysis of the transient effects shows that during the perfect tracking of the chirp frequency only transients from amplitude changes arise. The signal-to-noise-ratio gain, calculated in this paper, is ~ 16 for a shot-noise limited detector and ~ 4 for a detector with thermal noise.
Sagar, Vikram; Sengupta, Sudip; Kaw, Predhiman [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)
2012-11-15T23:59:59.000Z
Dynamics of a charged particle is studied in the field of a relativistically intense linearly polarized finite duration laser pulse in the presence of a static axial magnetic field. For a finite duration laser pulse whose temporal shape is defined by Gaussian profile, exact analytical expressions are derived for the particle trajectory, momentum, and energy as function of laser phase. From the solutions, it is shown that, unlike for the monochromatic plane wave case, resonant phase locking time between the particle and laser pulse is finite. The net energy transferred to the particle does not increase monotonically but tends to saturate. It is further shown that appropriate tuning of cyclotron frequency of the particle with the characteristic frequency in the pulse spectrum can lead to the generation of accelerated particles with variable energies in MeV-TeV range.
Rahatgaonkar, P. S.; Datta, D.; Malhotra, P. K.; Ghadge, S. G. [Nuclear Power Corporation of India Ltd., R-2, Ent. Block, Nabhikiya Urja Bhavan, Anushakti Nagar, Mumbai - 400 094 (India)
2012-07-01T23:59:59.000Z
Prediction of groundwater movement and contaminant transport in soil is an important problem in many branches of science and engineering. This includes groundwater hydrology, environmental engineering, soil science, agricultural engineering and also nuclear engineering. Specifically, in nuclear engineering it is applicable in the design of spent fuel storage pools and waste management sites in the nuclear power plants. Ground water modeling involves the simulation of flow and contaminant transport by groundwater flow. In the context of contaminated soil and groundwater system, numerical simulations are typically used to demonstrate compliance with regulatory standard. A one-dimensional Computational Fluid Dynamics code GFLOW had been developed based on the Finite Difference Method for simulating groundwater flow and contaminant transport through saturated and unsaturated soil. The code is validated with the analytical model and the benchmarking cases available in the literature. (authors)
A. Benseny; G. Albareda; A. S. Sanz; J. Mompart; X. Oriols
2014-10-20T23:59:59.000Z
Bohmian mechanics provides an explanation of quantum phenomena in terms of point particles guided by wave functions. This review focuses on the formalism of non-relativistic Bohmian mechanics, rather than its interpretation. Although the Bohmian and standard quantum theories have different formalisms, both give exactly the same predictions for all phenomena. Fifteen years ago, the quantum chemistry community began to study the practical usefulness of Bohmian mechanics. Since then, the scientific community has mainly applied it to study the (unitary) evolution of single-particle wave functions, either by developing efficient quantum trajectory algorithms or by providing a trajectory-based explanation of complicated quantum phenomena. Here we present a large list of examples showing how the Bohmian formalism provides a useful solution in different forefront research fields for this kind of problems (where the Bohmian and the quantum hydrodynamic formalisms coincide). In addition, this work also emphasizes that the Bohmian formalism can be a useful tool in other types of (non-unitary and nonlinear) quantum problems where the influence of the environment or the global wave function are unknown. This review contains also examples on the use of the Bohmian formalism for the many-body problem, decoherence and measurement processes. The ability of the Bohmian formalism to analyze this last type of problems for (open) quantum systems remains mainly unexplored by the scientific community. The authors of this review are convinced that the final status of the Bohmian theory among the scientific community will be greatly influenced by its potential success in these type of problems that present non-unitary and/or nonlinear quantum evolutions. A brief introduction of the Bohmian formalism and some of its extensions are presented in the last part of this review.
Masson, Jean-Baptiste; Triller, Antoine
2015-01-01T23:59:59.000Z
In recent years Bayesian Inference has become an efficient tool to analyse single molecule trajectories. Recently, high density single molecule tagging, Langevin Equation modelling and Bayesian Inference [10] have been used to infer diffusion, force and potential fields at the full cell scale. In this short comment, we point out pitfalls [1, 2] to avoid in single molecule analysis in order to get unbiased results and reliable fields at various scales.
Mendes, N.; Winkelmann, F. C.; Lamberts, R.; Philippi, P. C.; Da Cunha, Neto, J. A. B.
1996-01-01T23:59:59.000Z
evaporation-condensation theory in the pendular state (unsaturated liquid flow stage). The application of this theory is limited to low moisture content. Burch and Thomas ( I99 1 ) developed a computational model, MOIST, using the finite- difference...-1 8, 1984. 2. Burch D.M. and Thomas W.C., "An Analysis of Moisture Accumulation in Wood Frame Wall Subjected to Winter Climate", NISTIR 4674, Gaithersburg, MD: National Institute of Standards and Technology, 199 1. 3. Cunningham M.J., "The...
Journal of Applied Ecology 2007
Journal of Applied Ecology 2007 44, 748759 © 2007 The Authors. Journal compilation © 2007 British, distribution, edge, marbled murrelets, model transferability, old-growth Journal of Applied Ecology (2007) 44-nesting Alcid © 2007 The Authors. Journal compilation © 2007 British Ecological Society, Journal of Applied
Journal of Applied Ecology 2004
Holl, Karen
Journal of Applied Ecology 2004 41, 922933 © 2004 British Ecological Society Blackwell Publishing-scale, Sacramento River, succession, vegetation Journal of Applied Ecology (2004) 41, 922933 Introduction More than@ucsc.edu). #12;923 Riparian forest restoration © 2004 British Ecological Society, Journal of Applied Ecology, 41
Journal of Applied Ecology 2002
Holl, Karen
Journal of Applied Ecology 2002 39, 960970 © 2002 British Ecological Society Blackwell Science- tion, succession. Journal of Applied Ecology (2002) 39, 960970 Introduction Efforts to reclaim@ucsc.edu). #12;961 Vegetation on reclaimed mines © 2002 British Ecological Society, Journal of Applied Ecology
Applying Mathematics.... ... to catch criminals
O'Leary, Michael
Applying Mathematics.... ... to catch criminals Mike O'Leary Department of Mathematics Towson University Stevenson University Kappa Mu Epsion 2008 Mike O'Leary (Towson University) Applying mathematics Department Mike O'Leary (Towson University) Applying mathematics to catch criminals September 10, 2008 2 / 42
Applied inductive learning Louis Wehenkel
Wehenkel, Louis
problems 20 2.3.1 Classes 20 2.3.2 Types of classi cation problems 20 2.3.3 Learning and test sets 21 2Applied inductive learning Louis Wehenkel University of Li`ege Faculty of Applied Sciences Course;#12;APPLIED INDUCTIVE LEARNING COURSE NOTES : OCTOBER 2000 LOUIS A. WEHENKEL University of Li#12;ege
Applied inductive learning Louis Wehenkel
Wehenkel, Louis
.3.2 Types of classification problems 20 2.3.3 Learning and test sets 21 2.3.4 Decision or classificationApplied inductive learning Louis Wehenkel University of Liâ??ege Faculty of Applied Sciences Courseâ??e'' #12; #12; APPLIED INDUCTIVE LEARNING COURSE NOTES : OCTOBER 2000 LOUIS A. WEHENKEL University of Li
Shchekinova, E.; Uzer, T. [Center for Nonlinear Science, School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430 (United States); Chandre, C. [Centre de Physique Theorique-CNRS, Luminy, Case 907, 13288 Marseille Cedex 09 (France)
2006-10-15T23:59:59.000Z
The multiphoton ionization of hydrogen atoms in a strong elliptically polarized microwave field exhibits complex features that are not observed for ionization in circular and linear polarized fields. Experimental data reveal high sensitivity of ionization dynamics to the small changes of the field polarization. The multidimensional nature of the problem makes widely used diagnostics of dynamics, such as Poincare surfaces of section, impractical. We analyze the phase-space dynamics using the finite time stability analysis rendered by the fast Lyapunov indicators technique. The concept of zero-velocity surface is used to initialize the calculations and visualize the dynamics. Our analysis provides stability maps calculated for the initial energy at the maximum and below the saddle of the zero-velocity surface. We estimate qualitatively the dependence of ionization thresholds on the parameters of the applied field, such as polarization and scaled amplitude.
Notes 16. Analysis of tilting pad bearings
San Andres, Luis
2010-01-01T23:59:59.000Z
NOTES 16. STATIC AND DYNAMIC FORCED PERFORMANCE OF TILTING PAD BEARINGS: ANALYSIS INCLUDING PIVOT STIFFNESS Dr. Luis San Andr?s Mast-Childs Professor August 2010 SUMMARY Work in progress ? still a lot of be done Introduction... Figure 1 shows a tilting pad journal bearing comprised of four pads. Each pad tilts about its pivot making a hydrodynamic film that generates a pressure reacting to the static load applied on the spinning journal. This type of bearing is typically...
Dynamics in shear flow studied by X-ray Photon Correlation Spectroscopy
Sebastian Busch; Torben Haugaard Jensen; Yuriy Chushkin; Andrei Fluerasu
2008-03-19T23:59:59.000Z
X-ray photon correlation spectroscopy was used to measure the diffusive dynamics of colloidal particles in a shear flow. The results presented here show how the intensity autocorrelation functions measure both the diffusive dynamics of the particles and their flow-induced, convective motion. However, in the limit of low flow/shear rates, it is possible to obtain the diffusive component of the dynamics, which makes the method suitable for the study of the dynamical properties of a large class of complex soft-matter and biological fluids. An important benefit of this experimental strategy over more traditional X-ray methods is the minimization of X-ray induced beam damage. While the method can be applied also for photon correlation spectroscopy in the visible domain, our analysis shows that the experimental conditions under which it is possible to measure the diffusive dynamics are easier to achieve at higher q values (with X-rays).
Haihua Zhao; Ling Zou; Hongbin Zhang; David Andrs; Richard Martineau
2014-04-01T23:59:59.000Z
The reactor core isolation cooling (RCIC) system in a boiling water reactor (BWR) provides makeup water to the reactor vessel for core cooling when the main steam lines are isolated and the normal supply of water to the reactor vessel is lost. It was one of the very few safety systems still available during the Fukushima Daiichi accidents after the tsunamis hit the plants and the system successfully delayed the core meltdown for a few days for unit 2 & 3. Therefore, detailed models for RCIC system components are indispensable to understand extended station black-out accidents (SBO) for BWRs. As part of the effort to develop the new generation reactor system safety analysis code RELAP-7, major components to simulate the RCIC system have been developed. This paper describes the models for those components such as turbine, pump, and wet well. Selected individual component test simulations and a simplified SBO simulation up to but before core damage is presented. The successful implementation of the simplified RCIC and wet well models paves the way to further improve the models for safety analysis by including more detailed physical processes in the near future.
Investigation of Efficiency in Applied Field MagnetoPlasmaDynamic
Choueiri, Edgar
is reduced. It is shown that the efficiency-current curves have a decreasing-increasing behavior due
Investigation of Efficiency in Applied Field MagnetoPlasmaDynamic
Choueiri, Edgar
. It is shown that the efficiency-current curves have a decreasing- increasing behavior due to an interchange
Investigation of Efficiency in Applied Field MagnetoPlasmaDynamic
Choueiri, Edgar
is reduced. It is shown that the efficiency-current curves have a decreasing- increasing behavior due
Arzouni, Nibal
2012-10-19T23:59:59.000Z
One of the most important challenges in dynamic magnetic resonance imaging (MRI) is to achieve high spatial and temporal resolution when it is limited by system performance. It is desirable to acquire data fast enough to capture the dynamics...
Finding True Beliefs: Applying Rank-Dependent Expected Utility Theory
Chen, Yiling
-making that incorporates probability weighting and non-linear utility functions, to the analysis of the quadratic scoringFinding True Beliefs: Applying Rank-Dependent Expected Utility Theory to Proper Scoring Rules-value maximizers. Thus, we apply rank-dependent expected utility theory, a more general model of decision
Applied Mathematics College of Science MATH-BS
Kihara, Daisuke
Applied Mathematics College of Science MATH-BS Code-APMA Departmental/Program Major Courses (70 Of Nonlinear Systems For Engineering And The Sciences (3) Applied Math Selective: MA 42500 - Elements To Complex Analysis (3) Math/Statistics Selective: MA/STAT 41600 Probability or STAT 51600 - Basic
Quantifying sudden changes in dynamical systems using symbolic networks
Masoller, Cristina; Ayad, Sarah; Gustave, Francois; Barland, Stephane; Pons, Antonio J; Gómez, Sergio; Arenas, Alex
2015-01-01T23:59:59.000Z
We characterise the evolution of a dynamical system by combining two well-known complex systems' tools, namely, symbolic ordinal analysis and networks. From the ordinal representation of a time-series we construct a network in which every node weights represents the probability of an ordinal patterns (OPs) to appear in the symbolic sequence and each edges weight represents the probability of transitions between two consecutive OPs. Several network-based diagnostics are then proposed to characterize the dynamics of different systems: logistic, tent and circle maps. We show that these diagnostics are able to capture changes produced in the dynamics as a control parameter is varied. We also apply our new measures to empirical data from semiconductor lasers and show that they are able to anticipate the polarization switchings, thus providing early warning signals of abrupt transitions.
Quantifying sudden changes in dynamical systems using symbolic networks
Cristina Masoller; Yanhua Hong; Sarah Ayad; Francois Gustave; Stephane Barland; Antonio J. Pons; Sergio Gómez; Alex Arenas
2015-01-27T23:59:59.000Z
We characterise the evolution of a dynamical system by combining two well-known complex systems' tools, namely, symbolic ordinal analysis and networks. From the ordinal representation of a time-series we construct a network in which every node weights represents the probability of an ordinal patterns (OPs) to appear in the symbolic sequence and each edges weight represents the probability of transitions between two consecutive OPs. Several network-based diagnostics are then proposed to characterize the dynamics of different systems: logistic, tent and circle maps. We show that these diagnostics are able to capture changes produced in the dynamics as a control parameter is varied. We also apply our new measures to empirical data from semiconductor lasers and show that they are able to anticipate the polarization switchings, thus providing early warning signals of abrupt transitions.
Applying Feedback Control to QoS Management Giovanna Ferrari
Newcastle upon Tyne, University of
Applying Feedback Control to QoS Management Giovanna Ferrari Distributed Systems Group, Department The importance of Feedback Control Theory used for dynamic systems has grown in recent years, due to the fundamental role played in modern technological systems. It represents a well developed analytic foundation
Mondal, Santanu; Chakrabarti, Sandip K
2014-01-01T23:59:59.000Z
We study accretion flow dynamics of Galactic transient black hole candidate (BHC) H 1743-322 during its 2010 outburst by analyzing spectral data using Two Component (Keplerian and sub-Keplerian) Advective Flow (TCAF) solution, after its inclusion in XSPEC as a local model. We compare our TCAF solution fitted results with combined disk black body and power-law model fitted results and find a similar smooth variation of thermal (Keplerian or disk black body) and non-thermal (power-law or sub-Keplerian) fluxes/rates in two types of model fits. For a spectral analysis, 2.5-25 keV spectral data from RXTE PCA instrument are used. From the TCAF solution fit, accretion flow parameters, such as Keplerian rate, sub-Keplerian rate, location of centrifugal pressure supported shock and strength of the shock are extracted, thus providing a deeper understanding of accretion process and properties of accretion disks around BHC H 1743-322 during its X-ray outburst. Based on the halo to disk accretion rate ratio (ARR), shock p...
Department of Applied Mathematics Department of Applied Mathematics
Heller, Barbara
, computational mathematics, discrete applied mathematics, and stochas- tics. More detailed descriptions of Philosophy in Collegiate Mathematics Education (joint program with the Department of Mathematics and Science Education) Research Facilities The department provides students with office space equipped with computers
Doctor of Applied Social Research Applied Social Research Pathway
Little, Tony
qualitative and quantitative data, taking account of reliability, validity and research ethics; - To develop · Advanced Quantitative Analysis · Advanced Qualitative Analysis · Thinking Sociologically · Advanced; - To design and complete a research thesis that adds significantly to knowledge and practice on a freely
Applied Sedimentology | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a <AlaskaApplied Energy Management Jump to: navigation, searchApplied QuantumApplied
GRADUATE BOOKLET Physics / Applied Physics
Rock, Chris
GRADUATE BOOKLET Physics / Applied Physics This booklet contains rules, guidelines and general information about graduate studies in the Physics Department at Texas Tech University. It does not replace documents. Contents I. General Comments: Admission, general policies, deadlines, etc II. Minimum
IIT SCHOOL OF APPLIED TECHNOLOGY
Heller, Barbara
INDUSTRIAL TECHNOLOGY AND MANAGEMENT IIT SCHOOL OF APPLIED TECHNOLOGY INDUSTRIAL OPERATIONS, chemical, and electronics manufacturing processes, and quality control · Supply Chain Management for Metals and Mechanical Systems · Industrial Risk Management · Sales and Operations Planning (S&OP) · E
Modeling applied to problem solving
Pawl, Andrew
We describe a modeling approach to help students learn expert problem solving. Models are used to present and hierarchically organize the syllabus content and apply it to problem solving, but students do not develop and ...
Mapping molecular dynamics computations to hypercubes
Lakamsani, Vamsee Krishna
1993-01-01T23:59:59.000Z
This thesis proposes an approach for systematic modeling, mapping and performance analysis of a Grand Challenge application problem in computational biology called Molecular Dynamics Simulation of Proteins. Molecular Dynamics (MD) is an important...
Analyzing the Dynamics of Chemical Networking Protocols
Vetter, Thomas
from several well-established fields, such as model linearization proposed in Metabolic Control congestion control protocol and highlight formerly unknown protocol features. Keywords: dynamic analysis;1 Introduction Predicting and controlling the dynamics of communication protocols are difficult but important
Reduced Measurement-space Dynamic State Estimation (ReMeDySE) for Power Systems
Zhang, Jinghe; Welch, Greg; Bishop, Gary; Huang, Zhenyu
2011-06-19T23:59:59.000Z
Abstract- Applying Kalman filtering techniques to dynamic state estimation is a developing research area in modern power systems.
Lee, Herbie
University of California, Santa Cruz, Applied Optics Grouphttp://photon.soe.ucsc.edu Nanoscale;University of California, Santa Cruz, Applied Optics Grouphttp://photon.soe.ucsc.edu Background Microfluidics Single molecule analysis Integrated optics Singleparticle Optofluidics Optofluidics: combination
Conjugate gradient methods for power system dynamic simulation on parallel computers
Decker, I.C.; Falcao, D.M.; Kaszkurewicz, E. [COPPE/Federal Univ. of Rio de Janeiro (Brazil)] [COPPE/Federal Univ. of Rio de Janeiro (Brazil)
1996-08-01T23:59:59.000Z
Parallel processing is a promising technology for the speedup of the dynamic simulations required in transient stability analysis. In this paper, three methods for dynamic simulation on parallel computers are described and compared. The methods are based on the concepts of spatial and/or time parallelization. In all of them, sets of linear algebraic equations are solved using different versions of Conjugate Gradient methods which have been successfully applied in other scientific and engineering applications. The algorithms presented in the paper were tested in a commercially available parallel computer using an actual large power system model. The results obtained in the tests showed a considerable reduction in computation time.
Endogenous and exogenous dynamics of pressure fluctuations in an impinging entrained-flow gasifier
Niu, Miao-Ren; Zhou, Wei-Xing; Wang, Fu-Chen; Yu, Zun-Hong
2007-01-01T23:59:59.000Z
On a laboratory-scale testing platform of impinging entrained-flow gasifier with two opposed burners, the pressure fluctuation signals were measured with a stainless steel water-cooled probe. Phenomenological investigations of the endogenous and exogenous dynamics in the fluctuations of pressure were carried out by performing the mean-variance analysis and separating the endogenous and exogenous components of the signals. Non-universal dynamics with power-law behaviors have been found not only in the original signals but also in their components. A new inequality was obtained showing that the exogenous exponent is smallest while the overall dynamic exponent is the largest. The results highlight that the dynamics of pressure fluctuations in the first fifteen minutes of the gasification process is driven dominantly by the ignition process. The method can be readily applied to the other multiphase systems like bubble column, fluidized bed, etc.
Michalis Agathos; Walter Del Pozzo; Tjonnie G. F. Li; Chris Van Den Broeck; John Veitch; Salvatore Vitale
2014-06-06T23:59:59.000Z
The direct detection of gravitational waves with upcoming second-generation gravitational wave detectors such as Advanced LIGO and Virgo will allow us to probe the genuinely strong-field dynamics of general relativity (GR) for the first time. We present a data analysis pipeline called TIGER (Test Infrastructure for GEneral Relativity), which is designed to utilize detections of compact binary coalescences to test GR in this regime. TIGER is a model-independent test of GR itself, in that it is not necessary to compare with any specific alternative theory. It performs Bayesian inference on two hypotheses: the GR hypothesis $\\mathcal{H}_{\\rm GR}$, and $\\mathcal{H}_{\\rm modGR}$, which states that one or more of the post-Newtonian coefficients in the waveform are not as predicted by GR. By the use of multiple sub-hypotheses of $\\mathcal{H}_{\\rm modGR}$, in each of which a different number of parameterized deformations of the GR phase are allowed, an arbitrarily large number of 'testing parameters' can be used without having to worry about a model being insufficiently parsimonious if the true number of extra parameters is in fact small. TIGER is well-suited to the regime where most sources have low signal-to-noise ratios, again through the use of these sub-hypotheses. Information from multiple sources can trivially be combined, leading to a stronger test. We focus on binary neutron star coalescences, for which sufficiently accurate waveform models are available that can be generated fast enough on a computer to be fit for use in Bayesian inference. We show that the pipeline is robust against a number of fundamental, astrophysical, and instrumental effects, such as differences between waveform approximants, a limited number of post-Newtonian phase contributions being known, the effects of neutron star spins and tidal deformability on the orbital motion, and instrumental calibration errors.
November 16, 2005 MSME in Dynamics and Vibration
Feeny, Brian
November 16, 2005 MSME in Dynamics and Vibration The dynamics and vibration track provides for their movement and vibration. Dynamics is the description of motion and the study of motion that results from applied forces and constraints. Vibration is the special case of the dynamics of oscillatory motion
UNIVERSITY OF CALIFORNIA, SANTA CRUZ DEPARTMENT OF APPLIED MATHEMATICS AND STATISTICS
California at Santa Cruz, University of
of applied mathematics and statistics: calculus, elementary statistics, control theory, fluid dynamics, numerical methods, stochastic modeling, probability theory and statistical inference. Outstanding candidates Reform and Control Act of 1986. Certain UCSC positions funded by federal contracts or sub
Final technical report [ACCELERATED MOLECULAR DYNAMICS SIMULATIONS OF REACTIVE HYDROCARBON SYSTEMS
Stuart, Steven J.
2014-02-25T23:59:59.000Z
The research activities in this project consisted of four different sub-projects. Three different accelerated dynamics techniques (parallel replica dynamics, hyperdynamics, and temperature-accelerated dynamics) were applied to the modeling of pyrolysis of hydrocarbons. In addition, parallel replica dynamics was applied to modeling of polymerization.
SIAM conference on applications of dynamical systems
Not Available
1992-01-01T23:59:59.000Z
A conference (Oct.15--19, 1992, Snowbird, Utah; sponsored by SIAM (Society for Industrial and Applied Mathematics) Activity Group on Dynamical Systems) was held that highlighted recent developments in applied dynamical systems. The main lectures and minisymposia covered theory about chaotic motion, applications in high energy physics and heart fibrillations, turbulent motion, Henon map and attractor, integrable problems in classical physics, pattern formation in chemical reactions, etc. The conference fostered an exchange between mathematicians working on theoretical issues of modern dynamical systems and applied scientists. This two-part document contains abstracts, conference program, and an author index.
Nonlinear analysis of time series of vibration data from a friction brake: SSA, PCA, and MFDFA
Nikolay K. Vitanov; Norbert P. Hoffmann; Boris Wernitz
2014-10-23T23:59:59.000Z
We use the methodology of singular spectrum analysis (SSA), principal component analysis (PCA), and multi-fractal detrended fluctuation analysis (MFDFA), for investigating characteristics of vibration time series data from a friction brake. SSA and PCA are used to study the long time-scale characteristics of the time series. MFDFA is applied for investigating all time scales up to the smallest recorded one. It turns out that the majority of the long time-scale dynamics, that is presumably dominated by the structural dynamics of the brake system, is dominated by very few active dimensions only and can well be understood in terms of low dimensional chaotic attractors. The multi-fractal analysis shows that the fast dynamical processes originating in the friction interface are in turn truly multi-scale in nature.
The effect of cyclic and dynamic loads on carbon steel pipe
Rudland, D.L.; Scott, P.M.; Wilkowski, G.M. [Battelle, Columbus, OH (United States)
1996-02-01T23:59:59.000Z
This report presents the results of four 152-mm (6-inch) diameter, unpressurized, circumferential through-wall-cracked, dynamic pipe experiments fabricated from STS410 carbon steel pipe manufactured in Japan. For three of these experiments, the through-wall crack was in the base metal. The displacement histories applied to these experiments were a quasi-static monotonic, dynamic monotonic, and dynamic, cyclic (R = {minus}1) history. The through-wall crack for the third experiment was in a tungsten-inert-gas weld, fabricated in Japan, joining two lengths of STS410 pipe. The displacement history for this experiment was the same history applied to the dynamic, cyclic base metal experiment. The test temperature for each experiment was 300 C (572 F). The objective of these experiments was to compare a Japanese carbon steel pipe material with US pipe material, to ascertain whether this Japanese steel was as sensitive to dynamic and cyclic effects as US carbon steel pipe. In support of these pipe experiments, quasi-static and dynamic, tensile and fracture toughness tests were conducted. An analysis effort was performed that involved comparing experimental crack initiation and maximum moments with predictions based on available fracture prediction models, and calculating J-R curves for the pipe experiments using the {eta}-factor method.
Journal of Applied Ecology 2007
Fagan, William
Normalized Difference Vegetation Index (NDVI) data from satellite imagery. 3. A second-order logistic model that satellite estimates of vegetation productivity can be used successfully to generate dynamic habitat models in landscapes with highly variable resources, and demonstrated that intermediate NDVI values were critical
Applied Optoelectronics | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a <AlaskaApplied Energy Management Jump to: navigation, search Name:EnergyApplied
Structure and Dynamics of Domains in Ferroelectric Nanostructures...
Office of Scientific and Technical Information (OSTI)
(STM) - TEM holder that allows the direct observation of nucleation and dynamic evolution of ferroelectric domains under applied electric field. Specifically, this project...
IMPACT OF DYNAMIC VOLTAGE SCALING (DVS) ON CIRCUIT OPTIMIZATION
Esquit Hernandez, Carlos A.
2010-01-16T23:59:59.000Z
Circuit designers perform optimization procedures targeting speed and power during the design of a circuit. Gate sizing can be applied to optimize for speed, while Dual-VT and Dynamic Voltage Scaling (DVS) can be applied ...
IMPACT OF DYNAMIC VOLTAGE SCALING (DVS) ON CIRCUIT OPTIMIZATION
Esquit Hernandez, Carlos A.
2010-01-16T23:59:59.000Z
Circuit designers perform optimization procedures targeting speed and power during the design of a circuit. Gate sizing can be applied to optimize for speed, while Dual-VT and Dynamic Voltage Scaling (DVS) can be applied to optimize for leakage...
Susmita Roy; Subramanian Yashonath; Biman Bagchi
2015-01-08T23:59:59.000Z
A self-consistent mode coupling theory (MCT) with microscopic inputs of equilibrium pair correlation functions is developed to analyze electrolyte dynamics. We apply the theory to calculate concentration dependence of (i) time dependent ion diffusion, (ii) dynamic structure factor of the constituent ions, and (iii) ion solvation dynamics in electrolyte solution. Brownian dynamics (BD) with implicit water molecules and molecular dynamics (MD) method with explicit water are used to check the theoretical predictions. The time dependence of ionic self-diffusion coefficient and the corresponding dynamic structure factor evaluated from our MCT approach show quantitative agreement with early experimental and present Brownian dynamic simulation results. With increasing concentration, the dispersion of electrolyte friction is found to occur at increasingly higher frequency, due to the faster relaxation of the ion atmosphere. The wave number dependence of total dynamic structure factor F(k,t), exhibits markedly different relaxation dynamics at different length scales. At small wave numbers, we find the emergence of a step-like relaxation, indicating the presence of both fast and slow time scales in the system. Such behaviour allows an intriguing analogy with temperature dependent relaxation dynamics of supercooled liquids. We find that solvation dynamics of a tagged ion exhibits a power law decay at long times- the decay can also be fitted to a stretched exponential form. The emergence of the power law in solvation dynamics has been tested by carrying out long Brownian dynamics simulations with varying ionic concentrations. This solvation time correlation and ion-ion dynamic structure factor indeed exhibits highly interesting, non-trivial dynamical behaviour at intermediate to longer times that require further experimental and theoretical studies.
Applied Sustainability Political Science 319
Young, Paul Thomas
1 Applied Sustainability Political Science 319 College of Charleston Spring 2013 Day/Time: TH 1 Address: fisherb@cofc.edu Office: 284 King Street, #206 (Office of Sustainability) Office Hours: by appt sustainability. It will focus on the development of semester-long sustainability projects, from conception
implementing bioenergy applied research & development
Northern British Columbia, University of
to be British Columbia's model for green energy and the first university in Canada to implement major power1 A Northern Centre for Renewable Energy implementing bioenergy applied research & development region be a model for the country and indeed, the world leading the way to a more sustainable future
Applying the Continuous Monitoring Technical
by providing technical leadership for the nation's measurement and standards infrastructure. ITL develops tests of technical, physical, administrative, and management standards and guidelines for the cost-effective securityApplying the Continuous Monitoring Technical Reference Model to the Asset, Configuration
Applying for a Training Contract
, usual deadline is July 31, 2013 for entry in September 2015. Students should apply in the 2nd year aimed at 2nd year LLB students & final year non-law students. Competition for these places is often more will successfully complete the Legal Practice Course each year. From the point of view of the student, there can
Rich, Sarah Celeste
2008-01-01T23:59:59.000Z
Molecular dynamics simulations of the ceramic compound zirconolite (CaZrTi?O?), a potential crystalline wasteform host for plutonium, were carried out for ideal and experimental crystalline forms and a simulated molten ...
Kim, Chansoo, S.M. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
A series of Molecular Dynamics (MD) simulations using the GROMACS® package has been performed in this thesis. It is used to mimic and simulate the hydration water in Lysozyme with three different hydration levels (h = 0.3, ...
Johnston, Michael J., S.M. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
Most major organizational changes never reap the benefits the original planners envisioned, they often take longer to implement than expected and in a dynamic environment that can spell disaster for a large enterprise. The ...
Revealing highly complex elastic nonlinear (anelastic) behavior of Earth materials applying a new nonlinear (anelastic) behavior of Earth materials applying a new probe: Dynamic acoustoelastic testing, J nonlinear acoustics has led to the development of refined experimental method to measure material elastic
Essays in applied financial economics
Ruben, Erik Charles
2007-01-01T23:59:59.000Z
This dissertation is composed of three chapters. The first demonstrates that natural gas violates many of the simplifying assumptions frequently used in modeling its behavior. Careful analysis of futures contracts written ...
Loads Analysis of Several Offshore Floating Wind Turbine Concepts
Robertson, A. N.; Jonkman, J. M.
2011-10-01T23:59:59.000Z
This paper presents a comprehensive dynamic-response analysis of six offshore floating wind turbine concepts.
University of Wisconsin-Madison Department of Agricultural & Applied Economics
Radeloff, Volker C.
. The model is used to analyze wholesale-retail price dynamics in the US butter market. The analysis provides is that retail prices do not respond very quickly to changes in market conditions. Under fluctuating market.g., Borenstein et al.; Peltzman; Miller and Hayenga). Peltzman finds strong evidence that in many markets retail
FY 1990 Applied Sciences Branch annual report
Keyes, B.M.; Dippo, P.C. [eds.
1991-11-01T23:59:59.000Z
The Applied Sciences Branch actively supports the advancement of DOE/SERI goals for the development and implementation of the solar photovoltaic technology. The primary focus of the laboratories is to provide state-of-the-art analytical capabilities for materials and device characterization and fabrication. The branch houses a comprehensive facility which is capable of providing information on the full range of photovoltaic components. A major objective of the branch is to aggressively pursue collaborative research with other government laboratories, universities, and industrial firms for the advancement of photovoltaic technologies. Members of the branch disseminate research findings to the technical community in publications and presentations. This report contains information on surface and interface analysis, materials characterization, development, electro-optical characterization module testing and performance, surface interactions and FTIR spectroscopy.
Dobson, Ian
Bulk Power System Dynamics and Control V, August 26-31, 2001, Onomichi, Japan Strong Resonance resonance occurring in the power system linearization. Moreover, the changes in the coefficients when the power system equa- tions are expressed in different coordinates or units show that the coefficients
1 A study of localisation in dual phase high-strength steels under dynamic loading using digital conducted on dual-phase high-strength steel in a split-Hopkinson tension bar at a strain-rate in the range-speed photography, localisation, dual-phase high strength-steel, split- Hopkinson bar, photomechanics, elasto
Biosystem Dynamics & Design | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Dynamics & Design Overview Atmospheric Aerosol Systems Biosystem Dynamics & Design Energy Materials & Processes Terrestrial & Subsurface Ecosystems Biosystem Dynamics &...
University of Wisconsin-Madison Department of Agricultural & Applied Economics
Radeloff, Volker C.
the relative strengths, and weaknesses, of local retail and service markets are identified. Introduction 1 to enhance local retail and service sales will be most interested in the performance of the markets within is to apply the tools of Trade Area Analysis (TAA) to retail and service sales data for Wisconsin counties
Summer Institute of Applied Statistics (SIAS) Past Presenters
Hart, Gus
Eubank Arizona State University Inference for Stochastic Processes Tailen Hsing The Ohio State University Categorical Data Analysis 1990 Seymour Sudman University of Illinois Applied Sampling of Human Populations William Hunter University of Wisconsin Experimental Design 1982 Norman Draper University of Wisconsin
Operator Analysis of Neutrinoless Double Beta Decay
Kiwoon Choi; Kwang Sik Jeong; Wan Young Song
2002-07-19T23:59:59.000Z
We study the effective operators of the standard model fields which would yield an observable rate of neutrinoless double beta decay. We particularly focus on the possibility that neutrinoless double beta decay is dominantly induced by lepton-number-violating higher dimensional operators other than the Majorana neutrino mass. Our analysis can be applied to models in which neutrinoless double beta decay is induced either by a strong dynamics or by quantum gravity effects at a fundamental scale near the TeV scale as well as the conventional models in which neutrinoless double beta decay is induced by perturbative renormalizable interactions.
At the Intersection of Applied Formal Methods
Zimmerman, Daniel M.
of Technology University of Washington Tacoma NTU Graduate Seminar, - 7 January 2011 #12;Outline · Applied
Building Reliable Software Applied Formal Methods
Zimmerman, Daniel M.
Institute of Technology University of Washington Tacoma #12;Outline · Applied Formal Methods · Correctness
Coherent neutron scattering and collective dynamics on mesoscale
Novikov, Vladimir [ORNL; Schweizer, Kenneth S [ORNL; Sokolov, Alexei P [ORNL
2013-01-01T23:59:59.000Z
By combining, and modestly extending, a variety of theoretical concepts for the dynamics of liquids in the supercooled regime, we formulate a simple analytic model for the temperature and wavevector dependent collective density fluctuation relaxation time that is measurable using coherent dynamic neutron scattering. Comparison with experiments on the ionic glass-forming liquid Ca K NO3 in the lightly supercooled regime suggests the model captures the key physics in both the local cage and mesoscopic regimes, including the unusual wavevector dependence of the collective structural relaxation time. The model is consistent with the idea that the decoupling between diffusion and viscosity is reflected in a different temperature dependence of the collective relaxation time at intermediate wavevectors and near the main (cage) peak of the static structure factor. More generally, our analysis provides support for the ideas that decoupling information and growing dynamic length scales can be at least qualitatively deduced by analyzing the collective relaxation time as a function of temperature and wavevector, and that there is a strong link between dynamic heterogeneity phenomena at the single and many particle level. Though very simple, the model can be applied to other systems, such as molecular liquids.
Image texture analysis of elastograms
Hussain, Fasahat
1999-01-01T23:59:59.000Z
and developed to make it a commercial product. 'This research applies image texture analysis to computer generated elastograms to obtain effective texture features. Four image analysis techniques, no-occurrence statistics, wavelet decomposition, frontal analysis...
Mesoscale ocean dynamics modeling
mHolm, D.; Alber, M.; Bayly, B.; Camassa, R.; Choi, W.; Cockburn, B.; Jones, D.; Lifschitz, A.; Margolin, L.; Marsden, L.; Nadiga, B.; Poje, A.; Smolarkiewicz, P. [Los Alamos National Lab., NM (United States); Levermore, D. [Arizona Univ., Tucson, AZ (United States)
1996-05-01T23:59:59.000Z
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The ocean is a very complex nonlinear system that exhibits turbulence on essentially all scales, multiple equilibria, and significant intrinsic variability. Modeling the ocean`s dynamics at mesoscales is of fundamental importance for long-time-scale climate predictions. A major goal of this project has been to coordinate, strengthen, and focus the efforts of applied mathematicians, computer scientists, computational physicists and engineers (at LANL and a consortium of Universities) in a joint effort addressing the issues in mesoscale ocean dynamics. The project combines expertise in the core competencies of high performance computing and theory of complex systems in a new way that has great potential for improving ocean models now running on the Connection Machines CM-200 and CM-5 and on the Cray T3D.
Milking the spherical cow: on aspherical dynamics in spherical coordinates
Pontzen, Andrew; Teyssier, Romain; Governato, Fabio; Gualandris, Alessia; Roth, Nina; Devriendt, Julien
2015-01-01T23:59:59.000Z
Galaxies and the dark matter halos that host them are not spherically symmetric, yet spherical symmetry is a helpful simplifying approximation for idealised calculations and analysis of observational data. The assumption leads to an exact conservation of angular momentum for every particle, making the dynamics unrealistic. But how much does that inaccuracy matter in practice for analyses of stellar distribution functions, collisionless relaxation, or dark matter core-creation? We provide a general answer to this question for a wide class of aspherical systems; specifically, we consider distribution functions that are "maximally stable", i.e. that do not evolve at first order when external potentials (which arise from baryons, large scale tidal fields or infalling substructure) are applied. We show that a spherically-symmetric analysis of such systems gives rise to the false conclusion that the density of particles in phase space is ergodic (a function of energy alone). Using this idea we are able to demonstra...
Layer of protection analysis applied to ammonia refrigeration systems
Zuniga, Gerald Alexander
2009-05-15T23:59:59.000Z
Ammonia refrigeration systems are widely used in industry. Demand of these systems is expected to increase due to the advantages of ammonia as refrigerant and because ammonia is considered a green refrigerant. Therefore, it is important to evaluate...
Layer of protection analysis applied to ammonia refrigeration systems
Zuniga, Gerald Alexander
2009-05-15T23:59:59.000Z
on expert opinion to determine the values of the variables required for risk estimation. Fuzzy Logic has demonstrated to be useful in this situation allowing the construction of expert systems. Based on fuzzy logic, the LOPA method was adapted to represent...
APPLYING SOCIAL NETWORK ANALYSIS TO KNOWLEDGE PETER BUSCH
Richards, Debbie
, Macquarie University North Ryde, NSW, 2109, Australia DEBBIE RICHARDS Department of Computing, Macquarie University North Ryde, NSW, 2109, Australia Tacit knowledge is either learnt through repeated experience and Release the Power of Innovation, Oxford University Press, Inc., New York. #12;
Applying Nonparametric Robust Bayesian Analysis to NonOpinionated Judicial
and Professor of StatisÂ tics and Computational Mathematics at Simon Bolivar University, Caracas. JBK's research of Education and Science Grant DIGYCIT, PB93Â1154, and MEP and LRP's by GIDÂCONICIT. 1 #12; 1 Introduction
APPLYING MACHINE LEARNING TECHNIQUES TO ANALYSIS OF GENE
for regression. The CAMDA Data Set 2 involves classifying acute leukemias. Acute leukemias can broadly be divided into two classes, acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL). The dataset consists
International Institute for Applied Systems Analysis | Open Energy
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh Plains Wind Farm Jump to:Indianapolis, Indiana:PageInternational EnergyInformation
Behavioral Economics Applied to Energy Demand Analysis: A Foundation -
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm1 of 62.1 Print National Center0.1Lab NewsofBehavior of
Lectures on Applied Mathematics Part 2: Numerical Analysis
Bowen, Ray M.
2015-03-24T23:59:59.000Z
of Linear Equations………………………………… 591 Section 7.3 Additional MATLAB Related Matrix Operations…………… 595 Section 7.4 Ill Conditioned Matrices……………………………………… 611 Section 7.5 Additional Discussion of LU Decomposition.………………... 621 Section 7.6 Additional....2 MATLAB’s fzero Command…………………………….. 679 Section 9.3 Bracketing Methods………………………………………… 683 Section 9.4 The Newton-Raphson Method……………………………… 705 Section 9.5 Systems of Nonlinear Equations……………………………. 715 Section 9.6 Polynomials...
Behavioral Economics Applied to Energy Demand Analysis: A Foundation
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Generation Three technologies are considered in the RDM for residential generation: Solar PV, Wind, and Fuel Cells. Distributed generation penetration is based on a cash flow...
Lectures on Applied Mathematics Part 2: Numerical Analysis
Bowen, Ray M.
2015-03-24T23:59:59.000Z
of Linear Equations………………………………… 591 Section 7.3 Additional MATLAB Related Matrix Operations…………… 595 Section 7.4 Ill Conditioned Matrices……………………………………… 611 Section 7.5 Additional Discussion of LU Decomposition.………………... 621 Section 7.6 Additional....2 MATLAB’s fzero Command…………………………….. 679 Section 9.3 Bracketing Methods………………………………………… 683 Section 9.4 The Newton-Raphson Method……………………………… 705 Section 9.5 Systems of Nonlinear Equations……………………………. 715 Section 9.6 Polynomials...
Dynamics Within an Organisation: Temporal Specification, Simulation and Evaluation
Treur, Jan
- 1 - Dynamics Within an Organisation: Temporal Specification, Simulation and Evaluation Catholijn is its dynamics. In this paper different types of specifications of properties of the dynamics within an organisation are introduced. Supporting tools for specification, simulation and analysis of dynamics within
Applied Mathematics and Plasma Physics
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm BiofuelinAnalysis ofAntonyaFederal(SC)FBerkeley LabCCS Â»
ON ROBUST DYNAMIC PROGRAMMING Anton G. Madievslci* and John B. Moore~*
Moore, John Barratt
control for known deterministic and sto- chastic systems. There is a need, however, to apply dynamic progr: dynamic programming; robust control; principle of optimality ? The author wishes to acknowledge and sto- chastic models. Now, what happens if we apply dynamic programming to a real-world system, prone
Model Driven Mutation Applied to Adaptative Systems Testing
Bartel, Alexandre; Munoz, Freddy; Klein, Jacques; Mouelhi, Tejeddine; Traon, Yves Le
2012-01-01T23:59:59.000Z
Dynamically Adaptive Systems modify their behav- ior and structure in response to changes in their surrounding environment and according to an adaptation logic. Critical sys- tems increasingly incorporate dynamic adaptation capabilities; examples include disaster relief and space exploration systems. In this paper, we focus on mutation testing of the adaptation logic. We propose a fault model for adaptation logics that classifies faults into environmental completeness and adaptation correct- ness. Since there are several adaptation logic languages relying on the same underlying concepts, the fault model is expressed independently from specific adaptation languages. Taking benefit from model-driven engineering technology, we express these common concepts in a metamodel and define the operational semantics of mutation operators at this level. Mutation is applied on model elements and model transformations are used to propagate these changes to a given adaptation policy in the chosen formalism. Preliminary resul...
Zeghib, Abdelghani
Introduction Results Linear Dynamics Lorentz Dynamics Actions of discrete groups on stationary Piccione) Geodeycos Meeting, Lyon, 28-30 April 2010 Abdelghani Zeghib Dynamics on Lorentz manifolds #12;Introduction Results Linear Dynamics Lorentz Dynamics Motivations and questions Examples 1 Introduction
Arzouni, Nibal
2012-10-19T23:59:59.000Z
of the unknown x-f spectrum of the dynamic images. tF is the temporal Fourier transform to make the signal sparse. R is the radon transform, and sF is the Fourier transform along the radial direction of the sinogram. M is the sampling operator along... backprojection like inverse radon transform. The quality of the composite image determines the quality of the reconstructed time frames. The different time frames are reconstructed by multiplying the composite image with the corresponding weighting...
How to Apply for the ENERGY STAR®
Broader source: Energy.gov [DOE]
Join us to learn about applying for ENERGY STAR Certification in Portfolio Manager. Understand the value of the ENERGY STAR certification, see the step-by-step process of applying, and gain tips to...
Patterns and perspectives in applied fracture mechanics
Merkle, J.G.
1994-12-31T23:59:59.000Z
This lecture begins with a overview of applied fracture mechanics pertinent to safety of pressure vessels. It then progresses to a chronological panorama of experimental and analytical results. To be useful and dependable in safety analysis of real structures, new analysis developments must be physically realistic, which means that they must accurately describe physical cause and effect. Consequently, before mathematical modeling can begin, cause and effect must be established from experimental data. This can be difficult and time consuming, but worth the effort. Accordingly, the theme of this paper is that the search for patterns is constant and vital. This theme is illustrated by the development of small, single-specimen, fracture toughness testing techniques. It is also illustrated by the development, based on two different published large-strain, elastic-plastic, three-dimensional finite-element analyses, of a hypothesis concerning three-dimensional loss of constraint. When a generalization of Irwin`s thickness-normalized plastic-zone parameter, reaches a value close to 2{pi}, the through-thickness contraction strain at the apex of the near-tip logarithmic-spiral slip-line region becomes the dominant negative strain accommodating crack opening. Because slip lines passing from the midplane to the stress-free side surfaces do not have to curve, once these slip lines are established, stresses near the crack tip are only elevated by strain hardening and constraint becomes significantly relaxed. This hypothesis, based on published three-dimensional elastic-plastic analyses, provides a potentially valuable means for gaining additional insight into constraint effects on fracture toughness by considering the roles played by the plastic strains as well as the stresses that develop near a crack tip.
Kunsman, David Marvin; Aldemir, Tunc (Ohio State University); Rutt, Benjamin (Ohio State University); Metzroth, Kyle (Ohio State University); Catalyurek, Umit (Ohio State University); Denning, Richard (Ohio State University); Hakobyan, Aram (Ohio State University); Dunagan, Sean C.
2008-05-01T23:59:59.000Z
This LDRD project has produced a tool that makes probabilistic risk assessments (PRAs) of nuclear reactors - analyses which are very resource intensive - more efficient. PRAs of nuclear reactors are being increasingly relied on by the United States Nuclear Regulatory Commission (U.S.N.R.C.) for licensing decisions for current and advanced reactors. Yet, PRAs are produced much as they were 20 years ago. The work here applied a modern systems analysis technique to the accident progression analysis portion of the PRA; the technique was a system-independent multi-task computer driver routine. Initially, the objective of the work was to fuse the accident progression event tree (APET) portion of a PRA to the dynamic system doctor (DSD) created by Ohio State University. Instead, during the initial efforts, it was found that the DSD could be linked directly to a detailed accident progression phenomenological simulation code - the type on which APET construction and analysis relies, albeit indirectly - and thereby directly create and analyze the APET. The expanded DSD computational architecture and infrastructure that was created during this effort is called ADAPT (Analysis of Dynamic Accident Progression Trees). ADAPT is a system software infrastructure that supports execution and analysis of multiple dynamic event-tree simulations on distributed environments. A simulator abstraction layer was developed, and a generic driver was implemented for executing simulators on a distributed environment. As a demonstration of the use of the methodological tool, ADAPT was applied to quantify the likelihood of competing accident progression pathways occurring for a particular accident scenario in a particular reactor type using MELCOR, an integrated severe accident analysis code developed at Sandia. (ADAPT was intentionally created with flexibility, however, and is not limited to interacting with only one code. With minor coding changes to input files, ADAPT can be linked to other such codes.) The results of this demonstration indicate that the approach can significantly reduce the resources required for Level 2 PRAs. From the phenomenological viewpoint, ADAPT can also treat the associated epistemic and aleatory uncertainties. This methodology can also be used for analyses of other complex systems. Any complex system can be analyzed using ADAPT if the workings of that system can be displayed as an event tree, there is a computer code that simulates how those events could progress, and that simulator code has switches to turn on and off system events, phenomena, etc. Using and applying ADAPT to particular problems is not human independent. While the human resources for the creation and analysis of the accident progression are significantly decreased, knowledgeable analysts are still necessary for a given project to apply ADAPT successfully. This research and development effort has met its original goals and then exceeded them.
Journal of Computational and Applied Mathematics
Bohner, Martin
Journal of Computational and Applied Mathematics Most downloaded articles January - August 2004 1: a survey Journal of Computational and Applied Mathematics, 141 (2002) 1-26 2. M. Z. Liu, M. H. Song and Z([t])*1 Journal of Computational and Applied Mathematics, 166 (2004) 361-370 3. S. Kutluay, A. Esen and I
ANALYSIS AND APPLICATION OF INDUCTANCE IN CLOCK DISTRIBUTION NETWORKS
Hu, Xuchu
2012-01-01T23:59:59.000Z
applied in the AC analysis and non-linear circuit componentsanalysis build the circuit equations at different frequencies and solves the linearlinear analysis. While transient analysis solves circuit
Theoretical studies of combustion dynamics
Bowman, J.M. [Emory Univ., Atlanta, GA (United States)
1993-12-01T23:59:59.000Z
The basic objectives of this research program are to develop and apply theoretical techniques to fundamental dynamical processes of importance in gas-phase combustion. There are two major areas currently supported by this grant. One is reactive scattering of diatom-diatom systems, and the other is the dynamics of complex formation and decay based on L{sup 2} methods. In all of these studies, the authors focus on systems that are of interest experimentally, and for which potential energy surfaces based, at least in part, on ab initio calculations are available.
Hamiltonian Dynamics of Preferential Attachment
Konstantin Zuev; Fragkiskos Papadopoulos; Dmitri Krioukov
2015-04-29T23:59:59.000Z
Prediction and control of network dynamics are grand-challenge problems in network science. The lack of understanding of fundamental laws driving the dynamics of networks is among the reasons why many practical problems of great significance remain unsolved for decades. Here we study the dynamics of networks evolving according to preferential attachment, known to approximate well the large-scale growth dynamics of a variety of real networks. We show that this dynamics is Hamiltonian, thus casting the study of complex networks dynamics to the powerful canonical formalism, in which the time evolution of a dynamical system is described by Hamilton's equations. We derive the explicit form of the Hamiltonian that governs network growth in preferential attachment. This Hamiltonian turns out to be nearly identical to graph energy in the configuration model, which shows that the ensemble of random graphs generated by preferential attachment is nearly identical to the ensemble of random graphs with scale-free degree distributions. In other words, preferential attachment generates nothing but random graphs with power-law degree distribution. The extension of the developed canonical formalism for network analysis to richer geometric network models with non-degenerate groups of symmetries may eventually lead to a system of equations describing network dynamics at small scales.
Dynamic of astrophysical jets in the complex octonion space
Zi-Hua Weng
2015-06-12T23:59:59.000Z
The paper aims to consider the strength gradient force as the dynamic of astrophysical jets, explaining the movement phenomena of astrophysical jets. J. C. Maxwell applied the quaternion analysis to describe the electromagnetic theory. This encourages others to adopt the complex quaternion and octonion to depict the electromagnetic and gravitational theories. In the complex octonion space, it is capable of deducing the field potential, field strength, field source, angular momentum, torque, force and so forth. As one component of the force, the strength gradient force relates to the gradient of the norm of field strength only, and is independent of not only the direction of field strength but also the mass and electric charge for the test particle. When the strength gradient force is considered as the thrust of the astrophysical jets, one can deduce some movement features of astrophysical jets, including the bipolarity, matter ingredient, precession, symmetric distribution, emitting, collimation, stability, continuing acceleration and so forth. The above results reveal that the strength gradient force is able to be applied to explain the main mechanical features of astrophysical jets, and is the competitive candidate of the dynamic of astrophysical jets.
of engineering problems including voltage regulators, DC motors, and servomechanisms [1, 2, 3, 4, 5, 6, 7 Engineering, Texas A & M University, Ross Street, College Station, TX 77845 (kalmarnagy@aero.tamu.edu, a0h7710
Porter, Mason A.
. 4, pp. 783807 Bose-Einstein Condensates in Superlattices Mason A. Porter and P. G. Kevrekidis- perlattices to study cigar-shaped BoseEinstein condensates (BECs) in such potentials. We examine spatially-temporally periodic patterns. Key words. BoseEinstein condensates, multiple scale perturbation theory, Hamiltonian
Dynamic imaging with electron microscopy
Campbell, Geoffrey; McKeown, Joe; Santala, Melissa
2014-05-30T23:59:59.000Z
Livermore researchers have perfected an electron microscope to study fast-evolving material processes and chemical reactions. By applying engineering, microscopy, and laser expertise to the decades-old technology of electron microscopy, the dynamic transmission electron microscope (DTEM) team has developed a technique that can capture images of phenomena that are both very small and very fast. DTEM uses a precisely timed laser pulse to achieve a short but intense electron beam for imaging. When synchronized with a dynamic event in the microscope's field of view, DTEM allows scientists to record and measure material changes in action. A new movie-mode capability, which earned a 2013 R&D 100 Award from R&D Magazine, uses up to nine laser pulses to sequentially capture fast, irreversible, even one-of-a-kind material changes at the nanometer scale. DTEM projects are advancing basic and applied materials research, including such areas as nanostructure growth, phase transformations, and chemical reactions.
ALL ABOUT THE M.A. IN APPLIED LEGAL STUDIES The Applied Legal Studies Program
1 ALL ABOUT THE M.A. IN APPLIED LEGAL STUDIES The Applied Legal Studies Program This professional. In the case of aspiring Notaries, the degree will prepare students for admission to practice, subject for admission to the applied legal studies program. #12;2 The M.A. in Applied Legal Studies: The Program
Maxwell, Bruce D.
. Students in mathematics may use mathematical theory, computational techniques, algorithms, and the latest or for graduate work in mathematics, statistics, or scientific computing. The program demonstrates the utility in differential equations, applied mathematics, and numerical analysis. Graduates will be qualified
Critiquing the Masters: Applying 3D Production Lighting Principles to Famous 2D Works of Art
Ford, Angelique
2012-10-19T23:59:59.000Z
This thesis demonstrates the effects of applying lighting principles developed for 3D computer graphics production to well-known historical 2D paintings. The visual analysis and cinematographic direction is derived from the iterative review...
Building America Expert Meeting: Recommendations for Applying...
Building America Expert Meeting: Recommendations for Applying Water Heaters in Combination Space and Domestic Water Heating Systems Building America Expert Meeting: Recommendations...
SAGE, Summer of Applied Geophysical Experience
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
of Applied Geophysical Experience (SAGE) is a unique program designated to introduce geophysics students to geophysical exploration and research. SAGE's purpose is to enhance a...
Idealized Test Cases for Dynamical Core Experiments
Jablonowski, Christiane
Idealized Test Cases for Dynamical Core Experiments Christiane Jablonowski (University of Michigan-13/2006 #12;Motivation Â· Test cases for 3D dynamical cores on the sphere Â are hard to find in the literature groups Â lack standardized & easy-to-use analysis techniques Â· Idea: Establish a collection of test cases
Idealized Test Cases for Dynamical Core Experiments
Jablonowski, Christiane
Idealized Test Cases for Dynamical Core Experiments Christiane Jablonowski (University of Michigan-13/2006 #12;Motivation · Test cases for 3D dynamical cores on the sphere are hard to find in the literature groups lack standardized & easy-to-use analysis techniques · Idea: Establish a collection of test cases
Dynamic stiffness of suction caissons -vertical vibrations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Boundary element/finite element formulation . . . . . . . . . . . . . . . . 3 1.3.1 Boundary.2 Analysis methods for dynamic soil-structure interaction element formulation . . . . . . . . . . . . . . . . . . . . 3 1.3.2 Coupling of FE and BE regions
Flexible dynamics of floating wind turbines
Luypaert, Thomas (Thomas J.)
2012-01-01T23:59:59.000Z
This work presents Tower Flex, a structural dynamics model for a coupled analysis of offshore floating wind turbines consisting of a tower, a floating platform and a mooring system. In this multi-body, linear frequency-domain ...
Dynamic Fracture Toughness of Polymer Composites
Harmeet Kaur
2012-02-14T23:59:59.000Z
bar with required instrumentation to obtain load-history and initiation of crack propagation parameters followed by finite element analysis to determine desired dynamic properties. Single edge notch bend(SENB) type geometry is used for Mode-I fracture...
Introduction to Dynamic Distributed
Roma "La Sapienza", Universitŕ di
Introduction to Dynamic Distributed SystemsSystems #12;Outline Introduction Churn Building Applications in Dynamic Distributed Systems RegistersRegisters Eventual Leader election Connectivity in Dynamic Distributed Systems #12;Dynamic Distributed Systems: Context & Motivations Advent of Complex Distributed
Michael Murray; for the BRAHMS Collaboration
2007-10-24T23:59:59.000Z
The purpose of BRAHMS is to survey the dynamics of relativistic heavy ion (as well as pp and d-A) collisions over a very wide range of rapidity and transverse momentum. The sum of these data may give us a glimpse of the initial state of the system, its transverse and longitudinal evolution and how the nature of the system changes with time. Here I will concentrate on the origin and dynamics of the light flavors, i.e. the creation and transport of the up, down and strange quarks. The results presented here are certainly not the end of the story. It is my hope that in a few years new detectors will reveal the rapidity dependence of the charm and bottom quarks.
2001, Applied Statistics, 50, 143-154. Nonlinear autoregressive time series with multivariate
Glasbey, Chris
2001, Applied Statistics, 50, 143-154. Nonlinear autoregressive time series with multivariate's Buildings, Edinburgh, EH9 3JZ, Scotland July 27, 2000 Abstract A new form of nonlinear autoregressive time to be multivariate Gaussian mixtures. The model is also a type of multiprocess dynamic linear model
FINITE VOLUME METHODS APPLIED TO THE COMPUTATIONAL MODELLING OF WELDING PHENOMENA
Taylor, Gary
1 FINITE VOLUME METHODS APPLIED TO THE COMPUTATIONAL MODELLING OF WELDING PHENOMENA Gareth A.Taylor@brunel.ac.uk ABSTRACT This paper presents the computational modelling of welding phenomena within a versatile numerical) and Computational Solid Mechanics (CSM). With regard to the CFD modelling of the weld pool fluid dynamics, heat
Timetables Sem 1 2013/14 Student timetable -MSc in Applied Mathematics
Sidorov, Nikita
/65061 Continuum Mechanics Alan Turing G.209 Hazel (A) MATH65061 LECTURE MATH64051 Mathematical Methods (MAGIC022) Alan Turing Magic Room 1.213 Gajjar (J) LECTURE MATH44041/64041 Applied Dynamical Systems Univ Place 6.213 Glendinning (P) MATH64041 LECTURE MATH64051 Mathematical Methods (MAGIC022) Alan Turing Magic Room 1
Gait Rehabilitation Therapy Using Robot Generated Force Fields Applied at the Pelvis
Mavroidis, Constantinos
Gait Rehabilitation Therapy Using Robot Generated Force Fields Applied at the Pelvis ABSTRACT The Robotic Gait Rehabilitation (RGR) Trainer was designed and built to target secondary gait deviations tissue dynamics. KEYWORDS: Force field, robotic gait rehabilitation, pelvis. 1 INTRODUCTION Each year
Four Faculty Positions Applied Statistics & Computational Statistics
Shepp, Larry
Four Faculty Positions Applied Statistics & Computational Statistics The Department of Statistics at the Assistant Professor rank. Two positions are open in the area of Applied Statistics, with a focus on the development of statistical methodology and statistical consulting. The other two positions are open
Nuclear Facilities and Applied Technologies at Sandia
Wheeler, Dave; Kaiser, Krista; Martin, Lonnie; Hanson, Don; Harms, Gary; Quirk, Tom
2014-11-28T23:59:59.000Z
The Nuclear Facilities and Applied Technologies organization at Sandia National Laboratories’ Technical Area Five (TA-V) is the leader in advancing nuclear technologies through applied radiation science and unique nuclear environments. This video describes the organization’s capabilities, facilities, and culture.
Method for increasing the dynamic range of mass spectrometers
Belov, Mikhail; Smith, Richard D.; Udseth, Harold R.
2004-09-07T23:59:59.000Z
A method for enhancing the dynamic range of a mass spectrometer by first passing a sample of ions through the mass spectrometer having a quadrupole ion filter, whereupon the intensities of the mass spectrum of the sample are measured. From the mass spectrum, ions within this sample are then identified for subsequent ejection. As further sampling introduces more ions into the mass spectrometer, the appropriate rf voltages are applied to a quadrupole ion filter, thereby selectively ejecting the undesired ions previously identified. In this manner, the desired ions may be collected for longer periods of time in an ion trap, thus allowing better collection and subsequent analysis of the desired ions. The ion trap used for accumulation may be the same ion trap used for mass analysis, in which case the mass analysis is performed directly, or it may be an intermediate trap. In the case where collection is an intermediate trap, the desired ions are accumulated in the intermediate trap, and then transferred to a separate mass analyzer. The present invention finds particular utility where the mass analysis is performed in an ion trap mass spectrometer or a Fourier transform ion cyclotron resonance mass spectrometer.
15.872 System Dynamics II, Fall 2010
Sterman, John
15.872 is a continuation of 15.871 Introduction to System Dynamics. It emphasizes tools and methods needed to apply systems thinking and simulation modeling successfully in complex real-world settings. The course uses ...
Model reduction for nonlinear dynamical systems with parametric uncertainties
Zhou, Yuxiang Beckett
2012-01-01T23:59:59.000Z
Nonlinear dynamical systems are known to be sensitive to input parameters. In this thesis, we apply model order reduction to an important class of such systems -- one which exhibits limit cycle oscillations (LCOs) and ...
Optimal approach to quantum communication using dynamic programming
Nehorai, Arye
Optimal approach to quantum communication using dynamic programming Liang Jiang* , Jacob M. Taylor*§ , Navin Khaneja¶ , and Mikhail D. Lukin* *Department of Physics, ¶School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138; and §Department of Physics, Massachusetts Institute
Power Flow Modelling of Dynamic Systems - Introduction to Modern Teaching Tools
Geitner, Gert-Helge
2015-01-01T23:59:59.000Z
As tools for dynamic system modelling both conventional methods such as transfer function or state space representation and modern power flow based methods are available. The latter methods do not depend on energy domain, are able to preserve physical system structures, visualize power conversion or coupling or split, identify power losses or storage, run on conventional software and emphasize the relevance of energy as basic principle of known physical domains. Nevertheless common control structures as well as analysis and design tools may still be applied. Furthermore the generalization of power flow methods as pseudo-power flow provides with a universal tool for any dynamic modelling. The phenomenon of power flow constitutes an up to date education methodology. Thus the paper summarizes fundamentals of selected power flow oriented modelling methods, presents a Bond Graph block library for teaching power oriented modelling as compact menu-driven freeware, introduces selected examples and discusses special f...
Dynamical clustering of counterions on flexible polyelectrolytes
Tak Shing Lo; Boris Khusid; Joel Koplik
2007-07-31T23:59:59.000Z
Molecular dynamics simulations are used to study the local dynamics of counterion-charged polymer association at charge densities above and below the counterion condensation threshold. Surprisingly, the counterions form weakly-interacting clusters which exhibit short range orientational order, and which decay slowly due to migration of ions across the diffuse double layer. The cluster dynamics are insensitive to an applied electric field, and qualitatively agree with the available experimental data. The results are consistent with predictions of the classical theory only over much longer time scales.
Dynamic study of tunable stiffness scanning microscope probe
Vega González, Myraida Angélica
2005-01-01T23:59:59.000Z
This study examines the dynamic characteristics of the in-plane tunable stiffness scanning microscope probe for an atomic force microscope (AFM). The analysis was carried out using finite element analysis (FEA) methods for ...
Shortcuts to Financial Analysis
Larson, R. J.
1985-01-01T23:59:59.000Z
. Shortcut methods allow identification of potentially attractive and unattractive ideas. They also allow quick selection between alternative solutions to the same problem. Therefore, thorough analysis is applied to those proposals which are most likely...
Ris-R-1395(EN) Generator Dynamics in
Risř-R-1395(EN) Generator Dynamics in Aeroelastic Analysis and Simulations Torben J. Larsen, Morten Laboratory, Roskilde, Denmark July 2003 #12;Abstract This report contains a description of a dynamic model order expression for the slow part. Dynamic effects of the first order terms in the model as well
van der Waerden's Theorem and Topological Dynamics Proof Mining
Gerhardy, Philipp
van der Waerden's Theorem and Topological Dynamics Proof Mining Proof Analysis Conclusion Proof Mining in Topological Dynamics Philipp Gerhardy Department of Mathematics University of Oslo Logic Colloquium 2008, Bern, Switzerland, July 3-8. Philipp Gerhardy Proof Mining in Topological Dynamics #12;van
Applied Intellectual Capital AIC | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a <AlaskaApplied Energy Management Jump to: navigation, search Name: AppliedApplied
Applied Technologies Company Ltd | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a <AlaskaApplied Energy Management Jump to: navigation, searchAppliedApplied
ENSO dynamics: low-dimensional-chaotic or stochastic?
Zivkovic, Tatjana
2012-01-01T23:59:59.000Z
We apply a test for low-dimensional, deterministic dynamics to the Nino 3 time series for the El Nino Southern Oscillation (ENSO). The test is negative, indicating that the dynamics is high-dimensional/stochastic. However, application of stochastic forcing to a time-delay equation for equatorial-wave dynamics can reproduce this stochastic dynamics and other important aspects of ENSO. Without such stochastic forcing this model yields low-dimensional, deterministic dynamics, hence these results emphasize the importance of the stochastic nature of the atmosphere-ocean interaction in low-dimensional models of ENSO.
Rafael Brada; Mordehai Milgrom
1998-12-21T23:59:59.000Z
We have recently discovered that the modified dynamics (MOND) implies some universal upper bound on the acceleration that can be contributed by a `dark halo'--assumed in a Newtonian analysis to account for the effects of MOND. Not surprisingly, the limit is of the order of the acceleration constant of the theory. This can be contrasted directly with the results of structure-formation simulations. The new limit is substantial and different from earlier MOND acceleration limits (discussed in connection with the MOND explanation of the Freeman law for galaxy disks, and the Fish law for ellipticals): It pertains to the `halo', and not to the observed galaxy; it is absolute, and independent of further physical assumptions on the nature of the galactic system; and it applies at all radii, whereas the other limits apply only to the mean acceleration in the system.
Yasuda, Shugo
2015-01-01T23:59:59.000Z
The Synchronized Molecular-Dynamics simulation which was recently proposed by authors [Phys. Rev. X {\\bf 4}, 041011 (2014)] is applied to the analysis of polymer lubrication between parallel plates. The rheological properties, conformational change of polymer chains, and temperature rise due to the viscous heating are investigated with changing the values of thermal conductivity of the polymeric liquid. It is found that at a small applied shear stress on the plate, the temperature of polymeric liquid only slightly increases in inverse proportion to the thermal conductivity and the apparent viscosity of polymeric liquid is not much affected by changing the thermal conductivity. However, at a large shear stress, the transitional behaviors of the polymeric liquid occur due to the interplay of the shear deformation and viscous heating by changing the thermal conductivity. This transition is characterized by the Nahme-Griffith number $Na$ which is defined as the ratio of the viscous heating to the thermal conducti...
Roadmap: Applied Engineering Applied Engineering and Technology Management Bachelor of Science
Sheridan, Scott
Roadmap: Applied Engineering Applied Engineering and Technology Management Bachelor of Science2013 Page 1 of 2 | Last Updated: 21-May-12/JS This roadmap is a recommended semester-by-semester plan TECH 43550 Computer-Aided Manufacturing 3 General Elective 6 #12;Roadmap: Applied Engineering
About the Applied Physics Career Applied physics is a general term for physics which is
Walker, Lawrence R.
About the Applied Physics Career Applied physics is a general term for physics which is intended" physics and engineering. "Applied" is distinguished from "pure" by a subtle combination of factors not be designing something in particular, but rather is using physics or conducting physics research with the aim
A. La Rosa Lecture Notes APPLIED OPTICS
A. La Rosa Lecture Notes APPLIED OPTICS _______________________________________________________________________________ The variational principle and ray propagation The ray equation Propagation on a lenslike media: GRIN lenses Ref: A. Yariv and P. Yeh, "Photonics," Oxford University Press. Chapter 2. The ray equation obtained from