Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Mathematics & Statistics

Modeling & simulation research

Search Publications

Search Title, Abstract, Conference, Citation, Keyword or Author

Title

Author

NIST Pub Series

Report Number

Published Date

Min

Max

Displaying 326 - 350 of 493

Particle-based simulation of nanoscale systems and materials

January 1, 2015

Author(s)

Alexander Y. Smolyanitsky, Vinod K. Tewary

This book chapter is focused on the introduction of molecular dynamics (MD) and molecular statics (MS), as well as some of their uses for studying the thermomechanical and (indirectly) electronic properties at the nanoscale. We first introduce the general

A Semantic Framework for Modeling and Simulation of Cyber-physical Systems

December 30, 2014

Author(s)

Parastoo Delgoshaei, Mark Austin, Amanda Pertzborn

This paper describes a new semantic platform infrastructure for model-based systems engineering, requirements traceability, and system simulation and assessment of cyberphysical systems (CPSs). When fully developed this environment will support the

The Structure of Optimal and Near Optimal Target Sets in Consensus Models

December 19, 2014

Author(s)

Fern Y. Hunt

We consider the problem of identifying a subset of nodes in a network that will enable the fastest spread of information in a decentralized environment. In a model of communication based on a random walk on an undirected graph, the optimal set over all

DATA ANALYTICS USING SIMULATION FOR SMART MANUFACTURING

December 11, 2014

Author(s)

Guodong Shao, Sanjay Jain, Seungjun Shin

Manufacturing organizations are able to accumulate large amounts of plant floor production and environmental data due to advances in data collection, communications technology, and use of standards. The challenge has shifted from collecting a sufficient

Effective and Scalable Uncertainty Evaluation for Large-Scale Complex System Applications

December 7, 2014

Author(s)

Kevin L. Mills, James J. Filliben, Junfei Xie, Yan Wan, Yi Zhou, Yu Lei

Effective uncertainty evaluation is a critical step toward real-time and robust decision-making for complex systems in uncertain environments. A Multivariate Probabilistic Collocation Method (M-PCM) was developed to effectively evaluate system uncertainty

Adaptive Restructuring of Radial Basis Functions Using Integrate-and-Fire Neurons

December 6, 2014

Author(s)

Jeremy A. Marvel

This paper proposes a neurobiology-based extension of integrate-and-fire models of Radial Basis Function Neural Networks (RBFNN) that adapts to novel stimuli by means of dynamic restructuring of the network's structural parameters. The new architecture

A material model and its application to simulate the composite material structure of mortar and concrete using real-shape particles

November 30, 2014

Author(s)

Edward Garboczi, Zhiwei Qian, Erik Schlangen, Guang Ye

The mesostructures of mortar and concrete can be represented by a model consisting of particles (sand, gravel) embedded in a cement paste matrix. Traditionally, spheres have been used to represent aggregates because of their simplicity, although the

Molecular dynamics simulation of thermal ripples in graphene with bond-order-informed harmonic constraints

November 7, 2014

Author(s)

Alexander Y. Smolyanitsky

We describe the results of atomistic molecular dynamics simulations of thermal rippling in graphene, obtained with a simple, low computational cost, harmonic constraint model. The constraint stiffness values are calculated directly from the bond order

A geometric description of nonreciprocity in coupled two-mode systems

October 16, 2014

Author(s)

Leonardo M. Ranzani, Jose A. Aumentado

We explore the concept of nonreciprocity in coupled two-mode systems using a geometric mapping to the Poincaré sphere. From this perspective, we recast the requirements for nonreciprocity in terms of rotation and inversion symmetry arguments for the vector

Expansions for a fundamental solution of Laplace's equation on R 3 in 5-cyclidic harmonics

October 14, 2014

Author(s)

Howard S. Cohl, Hans Volkmer

We derive eigenfunction expansions for a fundamental solution of Laplace's equation in three-dimensional Euclidean space in 5-cyclidic coordinates. There are three such expansions in terms of internal and external 5-cyclidic harmonics of first, second and

Determining Relative Importance and Best Settings for Genetic Algorithm Control Parameters

September 25, 2014

Author(s)

Kevin L. Mills, James J. Filliben, Andrea Haines

We intend to use a classic genetic algorithm (GA) to steer a population of cloud-computing simulators into behavioral directions that reveal degraded performance and system collapse. Such a method could serve as a design tool, empowering system engineers

Foundations of modeling in cryobiology I: Concentration, Gibbs energy, and chemical potential relationships

September 21, 2014

Author(s)

Daniel M. Anderson, James Benson, Anthony J. Kearsley

Mathematical modeling plays an enormously important role in understanding the behavior of cells, tissues, and organs undergoing cryopreservation. Uses of these models range from explanation of phenomena, exploration of potential theories of damage or

Online Supplemental Material for 'Foundations of modeling in cryobiologyI: Concentration, Gibbs energy, and chemical potential relationships'

September 21, 2014

Author(s)

Daniel M. Anderson, James Benson, Anthony J. Kearsley

The following contains supplemental online material related to alternate forms for the Gibbs Free Energy and associated chemical potential gradients.

A Simplified Approach to Determining Resolutions for Optical, Ion and Electron Microscope Images

August 26, 2014

Author(s)

Alexandra E. Curtin, Ann C. Chiaramonti Debay, Aric W. Sanders

Stochastic Regression Modeling of Chemical Spectra

August 14, 2014

Author(s)

Anthony J. Kearsley, William E. Wallace, Yutheeka Gadhyan

A stochastic regression method has been developed that decomposes chemical spectra into separate contributions from signal and from noise. The numerical results of regressing in this way on sample spectra are presented. The results suggest that this

Colored Noise and Regularization Parameter Selection for Waveform Metrology

July 8, 2014

Author(s)

Andrew M. Dienstfrey, Paul D. Hale

We study six regularization parameter selection algorithms applied to deconvolution problems relevant for characterization of high-speed communication measurement systems. In particular we investigate the performance of these selectors in the presence of

From atoms to steps: the microscopic origins of crystal growth.

July 1, 2014

Author(s)

Paul N. Patrone, T L. Einstein, Dionisios Margetis

Elucidating the Effects of Adsorbent Flexibility on Fluid Adsorption Using Simple Models and Flat-Histogram Sampling Methods

June 24, 2014

Author(s)

Vincent K. Shen, Daniel W. Siderius

Using flat-histogram Monte Carlo methods, we investigate the adsorptive behavior of the square-well fluid in two simple slit-pore- like models intended to capture fundamental characteristics of flexible adsorbent materials. The models require thermodynamic

The stability of milling: an impact oscillator with delay

June 20, 2014

Author(s)

Matthew A. Davies, Tony Schmitz, Timothy J. Burns

A Velocity Divergence Constraint for Large-Eddy Simulation of Low-Mach Flows

June 17, 2014

Author(s)

Randall J. McDermott

The velocity divergence (rate of fluid volumetric expansion) is a flow field quantity of fundamental importance in low-Mach flows. It directly affects the local mass density and therefore the local temperature through the equation of state. In this paper

A study of shear banding in polymer solutions

June 4, 2014

Author(s)

Michael E. Cromer, Glenn Fredrickson, Gary Leal

In a recent letter (Cromer et al. Phys. Fluids 2013) we showed, for the first time, the existence of a steady shear-banded velocity profile for a polymer solution with an underlying monotonic constitutive curve. The driving mechanism is the coupling of the

Distributed Deployment Algorithms for Improved Coverage in a Network of Wireless Mobile Sensors

February 1, 2014

Author(s)

Kamran Sayrafian, Vladimir V. Marbukh, Hamid Mahboubi, Kaveh Moezzi, Amir Aghdam

In this paper, sensor deployment strategies are developed for effective coverage in wireless sensor networks. In the proposed algorithms, the sensors find coverage holes within the corresponding Voronoi polygons, and then move in a proper direction to

Optimal Spread in Network Consensus Models

January 27, 2014

Author(s)

Fern Y. Hunt

Suppose we seek a set of nodes in a network that will enable the fastest spread of information in a decentralized communication environment. If communication resources are limited there are constraints on the number of nodes that can be selected. In this

Generalization and specializations of generating functions for Jacobi, Gegenbauer, Chebyshev and Legendre polynomials with definite integrals

January 15, 2014

Author(s)

Howard S. Cohl, Connor M. MacKenzie

In this paper we generalize and specialize generating functions for classical orthogonal polynomials, namely Jacobi, Gegenbauer, Chebyshev and Legendre polynomials. We derive a generalization of the generating function for Gegenbauer polynomials through

Feature Measures for the Segmentation of Neuronal Membrane using Machine Learning Algorithm

January 6, 2014

Author(s)

Afzal A. Godil, Saadia S. Iftikhar

In this paper, we present a Support Vector Machine (SVM) based pixel classifier for a semi-automated segmentation algorithm to detect neuronal membrane structures in stacks of electron microscopy images of brain tissue samples. This algorithm uses high-

Was this page helpful?