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Displaying 45726 - 45750 of 74220

A Novel Artifact for Testing Large Coordinate Measuring Machines

January 1, 2001
Author(s)
Steven D. Phillips, Daniel S. Sawyer, Bruce R. Borchardt, D E. Ward, D E. Beutel
We present a high accuracy artifact useful for the evaluation of large CMMs. This artifact can be physically probed by the CMM in contrast to conventional techniques that use purely optical methods such as laser interferometers. The system can be used over

A Numerical Method for Color Uncertainty

January 1, 2001
Author(s)
Yoshihiro Ohno
A method for calculating uncertainties of color quantities has been developed using a numerical approach based on the ISO Guide to the Expression of Uncertainty in Measurement. The uncertainties of any color quantities such as chromaticity coordinates

A Phase Field Model of the Premelting of Grain Boundaries in Pure Materials

January 1, 2001
Author(s)
A E. Lobkovsky, James A. Warren
We present a phase field model of solidification which includes the effects of the crystalline orientation in the solid phase. This model describes grain boundaries as well as solid-liquid boundaries within a unified framework. With an appropriate choice

A Phase-Field Model for High Anisotropic InterfaciEnergy

January 1, 2001
Author(s)
Geoffrey B. McFadden, J J. Eggleston, P W. Voorhees
A computationally efficient phase-field model is developed for two-phase systems with anisotropic interfacial energy. The approach allows for anisotropies sufficiently high that the interface has corners or missing crystallographic orientations. The method

A Refinement-Tree Based Partioning Method for Adaptively Refined Grids

January 1, 2001
Author(s)
William F. Mitchell
The partitioning of an adaptive grid for distribution over parallel processors is considered in the context of adaptive multilevel methods for solving partial differential equations. A k-way refinement-tree based partitioning method is presented. Numerical

A Single 199 Hg + Ion Optical Clock

January 1, 2001
Author(s)
James C. Bergquist, Christopher W. Oates, E A. Curtis, Leo W. Hollberg, Robert E. Drullinger, Wayne M. Itano, David J. Wineland, T Udem

A Surface Chemistry Study of Laser Ablated Plastics Used for Microfluidic Devices

January 1, 2001
Author(s)
D P. Pugmire, E A. Waddell, Michael J. Tarlov
Plastic substrates are being investigated for use in microfluidic devices because of their low cost, ease of fabrication, and wide range of materials properties. It is well established that the surface chemistry of a plastic substrate greatly influences

A U.S. Laser-Cooled Atomic-Clock System for Space

January 1, 2001
Author(s)
Donald Sullivan, Thomas P. Heavner, Leo W. Hollberg, D Meekhof, Thomas E. Parker, William D. Phillips, S L. Rolston, Hugh Robinson, Jon H. Shirley, F L. Walls, Neil Ashby, W Kepstein, L Maleki, D Seidel, R Q. Thompson, S Wu, L Young, R Vessot, E Mattison, A Demarchi
Displaying 45726 - 45750 of 74220