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Search Publications

NIST Authors in Bold

Displaying 626 - 650 of 7106

Coordinated Neutron and X-ray Computed Tomography of Meteorites: Detection and Distribution of Hydrogen-Bearing Materials

August 29, 2022
Author(s)
Allan Treiman, Jacob LaManna, Isabella DeClue, Daniel S. Hussey, Lawrence Anovitz
… planets. Here, we show that coordinated neutron- and X-ray computed tomography, NXCT, can reveal the presence and … neutron imaging, X-ray imaging, computed tomography, multimodal imaging, data fusion, … Coordinated Neutron and X-ray Computed Tomography of Meteorites: Detection and Distribution …

Describing Art Objects to Computers

January 1, 1984
Author(s)
Russell A. Kirsch
… to use these verbal descriptions as input data for computers that were intended to serve as aids in the analysis … Describing Art Objects to Computers …

Efficient Computation of Optical Forces With the Coupled Dipole Method

October 12, 2021
Author(s)
P C. Chaumet, Adel Rahmani, A Sentenac, Garnett W. Bryant
… using the coupled dipole method. We show how the time of computation can be reduced by several orders of magnitude … of a small scatterer on the accuracy and robustness of the computation of optical forces. … Efficient Computation of Optical Forces With the Coupled Dipole Method …

Computer Modeling of Heterodyne Interferometer Errors

January 1, 1995
Author(s)
Lowell P. Howard, Jack A. Stone Jr.
… A computer model and methodology for modeling optical mixing … in the model. The model is solved symbolically using computer software and it is shown that imbalances intensities … Computer Modeling of Heterodyne Interferometer Errors …

X-ray computed tomography instrument performance evaluation, Part II: Sensitivity to rotation stage errors

July 11, 2019
Author(s)
Balasubramanian Muralikrishnan, Katharine M. Shilling, Steven D. Phillips, Wei Ren, Vincent Lee, Felix H. Kim
… of standards for evaluating the performance of X-ray computed tomography instruments is ongoing within ASME and … analysis, single point ray tracing method, X- ray computed tomography … X-ray computed tomography instrument performance evaluation, Part …

Design Repositories: Next-Generation Engineering Design Databases

July 1, 2000
Author(s)
Simon Szykman, Christophe Bochenek, J Racz, Ram D. Sriram
Summary of the NIST Design Repository Project, revised with some additional content on representation of function in computer-based design, and using XML to describe function and taxonomies in computer-based design.

Finite Element Analysis of Elastic-Plastic Solids at Large Strain

December 30, 1988
Author(s)
Jonathan W. Lee
A general purpose finite element program for the analysis of three dimensional elastic-plastic solids at large strains has been developed. In this work, this program is utilitzed to analyze a sample problem. The numerical results indicate the essential

Segmentation of Additive Manufacturing Defects Using U-Net

June 30, 2022
Author(s)
Vivian W. Wong, Max Ferguson, Kincho Law, Yung-Tsun Lee, Paul Witherell
Additive manufacturing (AM) provides design flexibility and allows rapid fabrications of parts with complex geometries. The presence of internal defects, however, can lead to the deficit performance of the fabricated part. X-ray computed tomography (XCT)

NIST and Computer Security

April 4, 2014
Author(s)
William E. Burr, Hildegard Ferraiolo, David A. Waltermire
… and security automation--has and continues to shape computer and information security at both national and global … NIST and Computer Security …

Mobile 3D Visualization for Construction

September 1, 2002
Author(s)
Robert R. Lipman
Until recently, visualization of 3D models required computational resources available only on desktop computers in office environments. With the advance of technology, it is now possible to visualize substantial 3D models on mobile handheld computers in

AGGRES: A Program for Computing Power Crusts of Aggregates

April 3, 2006
Author(s)
Javier Bernal
… AGGRES, a Fortran 77 program for computing a power crust of an aggregate, is discussed. AGGRES … is based on an algorithm by Amenta, Choi and Kolluri for computing power crusts using power diagrams. Besides a power … AGGRES: A Program for Computing Power Crusts of Aggregates …

Seventh International Conference on Computer Technology in Welding

November 1, 1997
Author(s)
Thomas A. Siewert
… It discusses these trends in terms of the changes in computer resources (rapid acceptance of the personal computer and advances in operating systems) as well as the … of sophisticated welding applications for these computer resources. The trends have been somewhat different …

Lets Talk, Robots

November 21, 2016
Author(s)
Craig I. Schlenoff
… This is a short article for Scientific Computing Magazine, at the request of the editor, that … Scientific Computing Magazine …

Complementary Use of Optical Metrology and X-Ray Computed Tomography for Surface Finish and Defect Detection in Laser Powder Bed Fusion Additive Manufacturing

July 25, 2018
Author(s)
Jason C. Fox, Felix H. Kim, Zachary C. Reese, Christopher Evans
… the complimentary use of optical metrology and x-ray computed tomography (XCT) for inspection of parts built … additive manufacturing, surface texture, x-ray computed tomography … Complementary Use of Optical Metrology and X-Ray Computed Tomography for Surface Finish and Defect Detection …

Even Small Factories Can Get Smarter

October 1, 2017
Author(s)
Thomas D. Hedberg, Moneer M. Helu
… ranging from the Internet of Things and big data to cloud computing and machine learning. Surprisingly, it may not be …

IR Computer Generated Holograms: Design and Application for the WFIRST Grism using Wavelength-Tuning Interferometry

July 14, 2018
Author(s)
Margaret Z. Dominguez, Catherine Marx, Qian Gong, John Hagopian, Ulf Griesmann, James Burge, Dae Wook Kim
… Interferometers using computer generated holograms (CGHs) have become the industry … Aspheric metrology, optical testing, computer generated hologram, infrared, wavelength-tuning, … IR Computer Generated Holograms: Design and Application for the …
Displaying 626 - 650 of 7106
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