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Topic Area: Modeling

Displaying records 41 to 50 of 88 records.
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41. Modeling atomic structure at the nanoscale using the PDF: simulation studies of monoatomic nanoparticles
Topic: Modeling
Published: 8/17/2010
Authors: Katharine M Mullen, Victor Lvovich Krayzman, Igor Levin
Abstract: The pair distribution function (PDF), as determined from total x-ray or neutron scattering, is a valuable probe of atomic arrangements in nanoparticles. Structural information in such experimental PDF data is convoluted with the effects of particle ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903954

42. Spectral Based Methods That Streamline the Search for Failure Scenarios in Large-Scale Distributed Systems
Topic: Modeling
Published: 7/22/2010
Authors: Fern Y Hunt, Christopher E Dabrowski, Katherine Morrison
Abstract: We report our work on the development of analytical and numerical methods that enable the detection of failure scenarios in distributed grid computing, cloud computing and other large scale systems.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907693

43. A Risk-Uncertainty Formula Accounting for Uncertainties of Failure Probability and Consequence in a Nuclear Powerplant
Topic: Modeling
Published: 7/20/2010
Authors: Jeffrey T Fong, Stephen R Gosselin, Pedro Vincente Marcal, James J Filliben, Nathanael A Heckert, Robert E Chapman
Abstract: This paper is a continuation of a recent ASME Conference paper entitled "Design of a Python-Based Plug-in for Bench-marking Probabilistic Fracture Mechanics Computer Codes with Failure Event Data" (PVP2009-77974). In that paper, which was co-authore ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905670

44. Estimating Volumes of Near-spherical Molded Artifacts
Series: Journal of Research (NIST JRES)
Topic: Modeling
Published: 5/3/2010
Authors: David E. Gilsinn, Bruce R. Borchardt, Amelia Tebbe
Abstract: The Food and Drug Administration (FDA) is conducting research on developing reference lung cancer cancer lesions, called phantoms, to test computed tomography (CT) scanners and their software. FDA loaned two semi-spherical phantoms to the National In ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904645

45. Onset of Convection in Binary Liquid Layers
Topic: Modeling
Published: 3/24/2010
Authors: Geoffrey B McFadden, Sam Ray Coriell, Aaron Lott
Abstract: We perform linear stability calculations for horizontal bilayers of a two-component fluid that can undergo a phase transformation, taking into account both buoyancy effects and thermocapillary effects in the presence of a vertical temperature gradien ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903602

46. The Solidification of an Ideal Ternary Alloy in a Mushy Layer
Topic: Modeling
Published: 3/24/2010
Authors: Daniel M. Anderson, Geoffrey B McFadden, Sam Ray Coriell, Bruce Murray
Abstract: We consider a model for the solidification of an ideal ternary alloy in a mushy layer that incorporates the effects thermal and solutal diffusion, convection and solidification. Our results reveal that although the temperature and solute fields are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902866

47. An Approximation Algorithm for the Coefficients of the Reliability Polynomial
Topic: Modeling
Published: 3/15/2010
Authors: Brian Dale Cloteaux, Isabel M Beichl, F Sullivan
Abstract: The reliability polynomial gives the probability that a graph remains connected given that each edge in it can fail independently with a probability p. While in general determining the coefficients of this polynomial is #P-complete, we give a randomi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902705

48. The DEMO Quasisymmetric Stellarator
Topic: Modeling
Published: 2/26/2010
Authors: Paul R. Garabedian, Geoffrey B McFadden
Abstract: The NSTAB code solves differential equations in conservation form, and the TRAN test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904630

49. Predicted Functions of MdmX in Fine Tuning the Response of p53 to DNA Damage
Topic: Modeling
Published: 2/1/2010
Authors: Sohyoung Kim, Mirit I Aladjem, Geoffrey B McFadden, Kurt W Kohn
Abstract: Tumor suppressor protein p53 is negatively regulated by two structurally homologous proteins, Mdm2 and MdmX. In contrast to Mdm2, MdmX lacks ubiquitin ligase activity. Although the essential interactions of MdmX are known, it is not clear how they fu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51271

50. A Structural Approach to the Temporal Modeling of Networks
Topic: Modeling
Published: 12/14/2009
Authors: Brian Dale Cloteaux, Isabel M Beichl
Abstract: Simulation of many dynamic real world systems such as the Internet and social networks requires developing dynamic models for the underlying networks in these systems. Currently, there is a large body of work devoted towards determining the underlyin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902636