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Displaying 37901 - 37925 of 143737

Two Applications of Small Feature Dimensional Measurements on a CMM with a Fiber Probe

September 4, 2013
Author(s)
Eric S. Stanfield, Bala Muralikrishnan, Theodore D. Doiron, Xiaoyu Alan Zheng, Shahram Orandi, david Duquette
We describe two interesting applications of dimensional measurements performed using a contact fiber probe on a commercial Coordinate Measuring Machine (CMM). Both examples involve artifacts that serve as material standards and contain features in the 100

Elemental analyses of soil and sediment fused with lithium borate using isotope dilution laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-IDMS)

September 2, 2013
Author(s)
John L. Molloy, Julian Malherbe, Fanny Claverie, Aitor Alvarez-Toral, Beatriz Fernandez, Rosario Pereiro
Quantitative analysis using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) remains challenging primarily due to elemental fractionation effects and to the lack of appropriate standards available for the wide variety of samples of

State-of-the-Art RF Signal Generation From Optical Frequency Division

September 2, 2013
Author(s)
Archita Hati, Craig W. Nelson, Corey A. Barnes, Danielle G. Lirette, Tara M. Fortier, Franklyn J. Quinlan, Jason A. DeSalvo, Andrew D. Ludlow, Till P. Rosenband, Scott A. Diddams, David A. Howe
We present the design of a novel, ultra-low phase-noise frequency synthesizer implemented with extremely low noise regenerative frequency dividers. This synthesizer generates eight outputs viz. 1.6 GHz, 320 MHz, 160 MHz, 80 MHz, 40 MHz, 20 MHz, 10 MHz and

The Effect of Tip Size in Calibration of Surface Roughness Specimens with Rectangular Profiles

September 2, 2013
Author(s)
Jun-Feng Song, Thomas B. Renegar, Johannes A. Soons, Balasubramanian Muralikrishnan, John S. Villarrubia, Xiaoyu A. Zheng, Theodore V. Vorburger
For the calibration of rectangular and trapezoidal profile roughness specimens, stylus tip will increase profile peak width and decrease valley width, which may cause the Ra changes (either increase or decrease, depends on the profile shape). Sometimes the

Analysis of Implanted Silicon Dopant Profiles

September 1, 2013
Author(s)
B. P. Geiser, Eric B. Steel, Karen T. Henry, D. Olson, T.J. Prosa
Atom probe tomography implant dose measurements are reported for National Institute of Standards and Technology Standard Reference Material 2134 (As implant). Efforts were taken to manufacture specimens with limited variation in size and shape to minimize

Correlating Photovoltaic Clear-Sky and Actual Output to Sky Cover Measurements

September 1, 2013
Author(s)
David R. Daily, David Holmberg, John Baras
As distributed energy resources are added to existing building systems, and variable priced electricity tariffs are introduced, facility owners may profit from understanding the expected performance of their building systems. Hourly, forecast energy

CTOA Testing of Pipeline Steels Using MDCB Specimens

September 1, 2013
Author(s)
Robert L. Amaro, Jeffrey W. Sowards, Elizabeth S. Drexler, Joseph D. McColskey, Christopher N. McCowan
Crack tip opening angle (CTOA) is used to rank the relative resistance to crack extension of various pipeline steels. In general, the smaller the CTOA value, the lower the resistance to crack extension. It is unclear, however, whether CTOA is a material
Displaying 37901 - 37925 of 143737
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