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NIST Authors in Bold

Displaying 26226 - 26250 of 74175

Instabilities as a Measurement Tool for Soft Materials

November 2, 2010
Author(s)
John A. Howarter, Christopher Stafford
Mechanical instabilities such as wrinkles, creases, and folds have long been viewed as a source of frustration for engineers and often a point of curiosity among scientists. Scientists aspire to understand the underlying physics behind the formation of

Nuclear Magnetic Resonance Gyroscopes

November 2, 2010
Author(s)
Elizabeth A. Donley
Nuclear magnetic resonance gyroscopes(NMRGs)detect rotation as shift in the Larmor precession frequency of nuclear spins. A review of the open literature on NMRGs is presented, which includes an introduction to the spectroscopic techniques that enable

Thickness dependence of the elastic modulus of tri (8-hydroxyquinolinato) aluminum (III)

November 2, 2010
Author(s)
Jessica M. Torres, Nathan Bakken, Christopher Stafford, Jian Li, Bryan D. Vogt
The intrinsic flexibility of organic molecules has been suggested to enable bendable electronics in comparison to their stiffer, inorganic counterparts. However, very little is known regarding the mechanical properties of these conjugated molecular glasses

A Review of Building Evacuation Models, 2nd Edition

November 1, 2010
Author(s)
Erica D. Kuligowski, Richard D. Peacock, Bryan L. Hoskins
Evacuation calculations are increasingly becoming a part of performance-based analyses to assess the level of life safety provided in buildings. In some cases, engineers are using back-of-the-envelope (hand) calculations to assess life safety, and in

An Application of Combinatorial Methods to Conformance Testing for Document Object Model Events

November 1, 2010
Author(s)
Carmelo Montanez-Rivera, D. Richard Kuhn, Mary C. Brady, Richard M. Rivello, Jenise Reyes Rodriguez, Michael K. Powers
This report describes the use of combinatorial test methods to reduce the cost of testing for the Document Object Model Events standard while maintaining an equivalent level of assurance. More than 36,000 tests - all possible combinations of equivalence

An Optical Frequency Comb Tied to GPS for Laser Frequency/Wavelength Calibration

November 1, 2010
Author(s)
Jack A. Stone Jr., Patrick F. Egan
Optical frequency combs can be employed over a broad spectral range to calibrate laser frequency or vacuum wavelength. This article describes procedures and techniques utilized in the Precision Engineering Division of NIST (National Institute of Standards

Association of Quantum dot nanoparticles with Pseudomonas aeruginosa biofilm

November 1, 2010
Author(s)
Jayne B. Morrow, Catalina Arango, Richard D. Holbrook
Quantum dots (QDs) of two different surface chemistries (carboxyl (COOH) and poly ethylene glycol (PEG) modified) were utilized to determine the impact of surface functionality on QD mobility and distribution in Pseudomonas aeruginosa PAO1 biofilms

Development of a Candidate Secondary Reference Procedure (immunoassay based measurement procedure of higher metrological order) for Cardiac Troponin I: I. Antibody Characterization and Preliminary Validation

November 1, 2010
Author(s)
James E. Noble, David M. Bunk, R. H. Christenson, Kenneth D. Cole, Hua-Jun He, Alexei Katrukha, Mauro Panteghini, Robert Porter, Heinz Schimmel, Jillian Tate, Lili Wang
The development of a reference measurement procedure to support the cardiac troponin I (cTnI) standardization initiative is described. The reference measurement procedure will be used to assign reference values to serum-based secondary standards. A

Dystopia

November 1, 2010
Author(s)
Isabel M. Beichl
This is an editorial for Computing in Science & Engineering on the subject of undergraduate education.

Effect of 3D Hydrogel Scaffold Stiffness on Human Bone Marrow Stromal Cell Differentiation

November 1, 2010
Author(s)
Carl G. Simon Jr., Sapun Parekh, Marcus T. Cicerone, Sheng Lin-Gibson, Kaushik Chatterjee, Marian F. Young
There is growing recognition cells can sense and respond to the mechanical properties of tissue scaffolds and that these interactions are critical in optimizing scaffold design [1-4]. Previous studies in planar 2D culture format have shown that human bone

Fire Resistive Materials: Thermal Barriers between Fires and Structures

November 1, 2010
Author(s)
Dale P. Bentz
Fire resistive materials (FRMs) serve a critical function in insulating (steel) structures to limit steel temperature rise during a fire exposure. This paper provides an overview of FRMs, focusing on the measurement of their thermophysical properties

Measuring Scale Errors in a Laser Tracker s Horizontal Angle Encoder through Simple Length Measurement and Two-face System Tests

November 1, 2010
Author(s)
Balasubramanian Muralikrishnan, Christopher J. Blackburn, Daniel S. Sawyer, Steven D. Phillips, Robert Bridges, Quan Ma
We describe a method to estimate the scale errors in the horizontal angle encoder of a laser tracker in this paper. The method does not require expensive instrumentation such as a rotary stage or even a calibrated artifact. An uncalibrated but stable

Noise-Parameter Measurements with a Reflection Type Phase Shifter

November 1, 2010
Author(s)
Dazhen Gu, Dave K. Walker, James P. Randa
We report a miniaturized phase shifter operating in the frequency range from 5 GHz to 7 GHz for noise-parameter extraction. Such a tunable solid-state unit represents a significant reduction in the size and mass as a source-pull component, compared to its

Optical fiber power meter comparison between NIST and NIM

November 1, 2010
Author(s)
Igor Vayshenker, Jian Li, L. M. Xiong, Z. X. Zhang, David J. Livigni, Xiaoyu X. Li, John H. Lehman
We describe the results of a comparison of reference standards between the National Institute of Standards and Technology (NIST-USA) and National Institute of Metrology (NIM-China). We report optical fiber-based power measurements at nominal wavelengths of

A New Call Admission Control Scheme for Heterogeneous Wireless Networks

October 31, 2010
Author(s)
Duk Kyung Kim, David W. Griffith, Nada T. Golmie
Call admission control between heterogeneous networks,such as an integrated 3GPP LTE and WLAN network, plays an important role to utilize the system resources in a more efficient way. In this paper, we propose that the preference to the WLAN is determined

The use of filtered photodetectors for radiance measurement

October 31, 2010
Author(s)
Albert C. Parr, B. Carol Johnson
A methodology for using a calibrated filter radiometer to measure and monitor the spectral radiance of calibration sources is described. An example using a calibration sphere used by NIST for its remote sensing program is presented.
Displaying 26226 - 26250 of 74175
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