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Metrology

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Displaying 1201 - 1225 of 2730

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

SRM Catalog

January 18, 2013
Author(s)
Regina R. Montgomery
SRM Catalog

MEASURING THE IMPACT OF EDUCATION AND TRAINING

January 15, 2013
Author(s)
Georgia L. Harris
As metrologists we are typically subject matter experts (SMEs) in a technical area of measurement. However, most of us are not experts in measuring the value or impact of education and training efforts using standard models for evaluation. This paper will

Measurement of Scattering and Absorption Cross Sections of Dyed Microspheres

January 14, 2013
Author(s)
Adolfas Gaigalas, Steven J. Choquette
Measurements of absorbance and fluorescence emission were carried out on aqueous suspensions of polystyrene (PS) microspheres with a diameter of 2.5 µm. Microspheres with and without green BODIPY@ dye were measured. Placing the suspension inside an

AGVs and Forklifts Gaining Sight for Safety

January 10, 2013
Author(s)
Roger V. Bostelman
Forklifts and automated guided vehicles are useful tools for the manufacturing industry. With regard to safety of workers (and equipment) near industrial vehicles, there are issues when using either manned or automated powered industrial vehicles in
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