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Topic Area: Math

Displaying records 91 to 100 of 237 records.
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91. Estimating Volumes of Near-spherical Molded Artifacts
Series: Journal of Research (NIST JRES)
Topic: Math
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 ...

92. Waveform metrology and a quantitative study of regularized deconvolution
Topic: Math
Published: 5/1/2010
Authors: Paul D Hale, Andrew M Dienstfrey
Abstract: We present methodology and preliminary results of a Monte-Carlo simulation to perform a quantified analysis of regularized deconvolution in the context of full waveform metrology. We analyze the behavior of different regularized inversion methods wi ...

93. Onset of Convection in Binary Liquid Layers
Topic: Math
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 ...

94. The Solidification of an Ideal Ternary Alloy in a Mushy Layer
Topic: Math
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 ...

95. Rectangular Distribution Whose End-points Are Not Exactly Known: Curvilinear Trapezoidal Distribution
Topic: Math
Published: 3/11/2010
Authors: Raghu N Kacker, James F Lawrence
Abstract: The state of knowledge concerning a quantity about which scant specific information is available is often represented by a rectangular probability distribution on some interval (Z1, Z2) specified by scientific judgment. Often, the end-points Z1 and ...

96. The DEMO Quasisymmetric Stellarator
Topic: Math
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 ...

97. Mathematical and Computational Sciences Division Summary of Activities for Fiscal Year 2009
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7671
Topic: Math
Published: 2/25/2010
Author: Ronald F Boisvert
Abstract: This report summarizes the technical work of the Mathematical and Computational Sciences Division (MCSD) of NIST s Information Technology Laboratory. Part I (Overview) provides a high-level overview of the Division s activities, including highlight ...

98. Tensor Product B-spline Mesh Generation for Accurate Surface Visualizations in the NIST Digital Library of Mathematical Functions
Topic: Math
Published: 2/12/2010
Authors: Bonita V Saunders, Qiming Wang
Abstract: We discuss the use of tensor product B-spline meshes to design accurate three dimensional graphs of high level mathematical functions for the National Institute of Standards and Technology (NIST) Digital Library of Mathematical Functions. The graph ...

99. Predicted Functions of MdmX in Fine Tuning the Response of p53 to DNA Damage
Topic: Math
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 ...

100. Artificial Intelligence Tools for Failure Event Data Management and Probability Risk Analysis for Failure Prevention
Topic: Math
Published: 10/25/2009
Authors: Jeffrey T Fong, Pedro Vincente Marcal
Abstract: Over the last thirty years, much research has been done on the development of failure event databases and fatigue modeling of crack growth in pressure vessels and piping. According to a USNRC report (NUREG/CR6674, 2000), results of a fatigue crack g ...

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