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Displaying 1176 - 1200 of 2714

Determining Mechanical Reliability of Brittle Materials

April 18, 2013
Author(s)
Stephen W. Freiman, Jeffrey Fong
The widespread existence of slow crack growth in most glasses and ceramics due to a stress-enhanced reaction between an external environment and strained bonds at a crack tip greatly complicates the challenge of assuring the reliability of components which

Estimating Uncertainties in Antenna Measurements

April 8, 2013
Author(s)
Michael H. Francis
We describe general methods of estimating uncertainties in antenna measurements. These include estimates based on theory (analysis1), simulation, and altering the measurement system (self-coparison tests). The important component sources of uncertainty in

Field Standards for Weights and Measures

April 1, 2013
Author(s)
Georgia L. Harris
An article written for the measurement community on whether [field] standards are “fit for purpose”. Is the equipment used is in testing designed for the purpose in which it is being used. The concept of fit for purpose is common in method validation

Path aggregation techniques for EXAFS visualization and analysis

April 1, 2013
Author(s)
Bruce Ravel
The path expansion model used by feff considers the EXAFS spectrum as the sum of contributions from scattering geometries of two or more atoms in a cluster surrounding the absorbing atom. This model and its representation as a collection of les is the

Performance Metrics of Speed and Separation Monitoring in Shared Workspaces

April 1, 2013
Author(s)
Jeremy A. Marvel
A metric is proposed that evaluates speed and separation monitoring efficacy in industrial robot environments in terms of the quantification of safety and the effects on productivity. The collision potential is rep-resented by separation metrics and sensor

Ground Truth Systems for Object Recognition and Tracking

March 29, 2013
Author(s)
Afzal A. Godil, Roger D. Eastman, Tsai H. Hong
In this report we discuss different types of ground-truth systems used for evaluation of object recognition and tracking systems in industrial manufacturing environments. We discuss three main ways for acquiring ground truth for object recognition and

Evaluation of Pacific White Shrimp (Litopenaeus vannamei) Health During a Superintensive Aquaculture Growout using NMR-based Metabolomics

March 27, 2013
Author(s)
Tracey B. Schock, Dan Bearden, Jessica Duke, Abby Goodson, Daryl Weldon, Jeff Brunson, John Leffler
Success of the shrimp aquaculture industry requires technological advances that increase production and environmental sustainability. Indoor, superintensive, aquaculture systems have been developed that permit year-round production of farmed shrimp at high

3-D Optical Metrology of Finite sub-20 nm Dense Arrays using Fourier Domain Normalization

March 25, 2013
Author(s)
Jing Qin, Hui Zhou, Bryan M. Barnes, Ronald G. Dixson, Richard M. Silver
Reduced target dimensions requiring improved resolution and sensitivity have driven the need to use and analyze the phase and scattered frequency information available when using image-based scatterometry systems. One such system is scatterfield microscopy

Configuration of profiling tools for C/C++ applications under 64-bit Linux

March 20, 2013
Author(s)
David W. Flater
Application profiling tools are the instruments used to measure software performance at the function and application levels. Without careful configuration of the tools and the environment, invalid results are readily obtained. The errors may not become

Long-Wavelength Beam Steerer Based on a Micro-Electromechanical Mirror

March 1, 2013
Author(s)
Eyal Gerecht, Anthony B. Kos
Commercially available mirrors for scanning THz beams are too large to allow high-speed THz imaging. There is a need for smaller, more agile pointing apparatus to provide THz images in seconds, not minutes or hours. We have developed a fast THz beam

Advanced Calibration, Adjustment, and Operation of a Density and Sound Speed Analyzer

February 26, 2013
Author(s)
Tara J. Fortin, Arno D. Laesecke, Malte B. Freund, Stephanie L. Outcalt
Benchtop measurement systems have emerged as powerful tools in the ongoing quest for thermophysical property data. We demonstrate that these instruments can yield high quality data if operated in an informed manner. The importance of sample purity

Eddy Current Rail Inspection Using AC Bridge Techniques

February 26, 2013
Author(s)
Andrew D. Koffman, Bryan C. Waltrip, Yicheng Wang
AC bridge techniques commonly used for precision impedance measurements have been adopted to develop an eddy current sensor for rail defect detection. By using two detection coils instead of just one in a conventional sensor, we can balance out the large

Quantitative measurements of glutathione in yeast cell lysate using 1H NMR

February 20, 2013
Author(s)
Steve Y. Rhieu, Aaron A. Urbas, Katrice Lippa, Vytas Reipa
A method for quantifying the level of glutathione (GSH) in yeast cell lysate is described using 1H NMR analysis. For quantification purposes, the 1H resonances corresponding to the Cys βCH2 of GSH were identified as having the fewest overlapping spectral

Effects of fiber gripping methods on the single fiber tensile test: I. Non parametric statistical analysis

February 15, 2013
Author(s)
Jae Hyun Kim, Nathanael A. Heckert, Stefan D. Leigh, Haruki Kobayashi, Walter G. McDonough, Kirk D. Rice, Gale A. Holmes
Single fiber tensile tests using two different gripping methods were carried out on various fiber lengths. One method (the glue-tab grip) consists of mounting a fiber onto a rigid tab as specified in ASTM C1557-03 using an adhesive, while the other (the
Displaying 1176 - 1200 of 2714
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