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NIST Authors in Bold

Displaying 14501 - 14525 of 73896

Nanofriction: The Observation of Elastic Plowing

February 19, 2017
Author(s)
Z C. Ying, Stephen M. Hsu
Accurate friction measurement at nanoscale is critical in reliable device design. Literature papers have reported different friction values for the same materials pair when different instruments and tip sizes were used. We have conducted a series of

Nanotechnology--From Promising to Practical: The Role of Standards

February 19, 2017
Author(s)
Stephen W. Freiman
Products based upon nanotechnology represent a potential market for revolutionary new materials, particularly those where one or more dimension is less than 50 nm, e.g., films, carbon nanotubes, nanoparticles. Commercialization of materials such as these

Nanotribology: the Link to Macrotribology

February 19, 2017
Author(s)
Stephen M. Hsu
The study of adhesion, friction, and lubrication at the nanoscale is driven by the needs in niicrosystems, MEMS, and small scale devices. Reliabilitydurability of these devices depend on the ability to control these properties. Furthermore, if fast-moving

Negative Pressure in Water Capillary Bridges at Nanocontacts

February 19, 2017
Author(s)
Seung H. Yang, Michael Nosonovsky, Huan Zhang, Koo-Hyun Chung
Negative Laplace pressure may develop inside a water capillary bridge formed between two bodies and contribute to the force required to pull them apart. Because of the negative pressure, nanoscale water capillary bridges may not be stable. We show that

New Fire Retardant Nanocomposites

February 19, 2017
Author(s)
Takashi Kashiwagi
This is a chapter of a proposed book. This chapter reviews the progress of flammability of new type of polymer nanocomposites based on nanosilica particles, polyhedral oligometric silsequixanes (POSS), graphite, and carbon nanotubes. Three different types

New Synchrotron X-Ray Techniques for In-Situ Deformation Studies

February 19, 2017
Author(s)
Lyle E. Levine, R Thomson, Gabrielle G. Long, David R. Black
Many types of defects contribute to local and long-range stresses and strains in materials. These include vacancies, voids, prismatic loops, interstitials, inclusions, and dislocations. In most cases, dislocations play the dominant role in minimizing long

NIST Calibration Facility for Sizing Spheres Suspended in Liquids

February 19, 2017
Author(s)
Michelle K. Donnelly, George Mulholland, Michael R. Winchester
A calibration facility has been developed to measure the peak diameter of particles suspended in liquid using differential mobility analysis (DMA). A description of the facility and the features that contribute to measurements with low uncertainties is

NIST Interactive Data Evaluation Assessment Tool

February 19, 2017
Author(s)
R G. Munro
Data evaluation levels provide a means of classifying property data according to how the data were acquired, processed, and reported. The present protocol is based on the seven categories of acceptable data that are discussed in the NIST Recommended

NIST Research in Autonomous Construction

February 19, 2017
Author(s)
Alan M. Lytle, Kamel S. Saidi
The National Institute of Standards and Technology Construction Metrology and Automation Group is conducting ongoing research to provide standards, methodologies, and performance metrics that will assist the development of advanced systems to automate

NIST Research in Crane AutomationA 2007 Overview

February 19, 2017
Author(s)
Kamel S. Saidi, Alan M. Lytle
The National Institute of Standards and Technology (NIST) has been conducting research in crane automation since the mid 1980 s. A robotic crane (RoboCrane) based on an inverted, cable actuated Stewart-Gough platform principle was invented at NIST at that

NIST Researcher Highlights Challenges of Talking Ceramics

February 19, 2017
Author(s)
Terrell A. Vanderah
In the last three decades, communications technologieshave been completely transformed by the wirelessrevolution. Devices such as cell phones are now socommon that many consumers are forgoing the hardwiredversions altogether. This remarkable

NIST: A Century in the Business of Fire Safety

February 19, 2017
Author(s)
Richard Gann
This year, the National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS), turned 100 years old. During that century, NBS/NIST measurement technology has done much to enable the business of fire safety. Today

North American Standards and Specifications for Portland Cement

February 19, 2017
Author(s)
J H. Pielert, G J. Frohnsdorff
The earliest work in the United States on the development of portland cement standards was conducted by the American Society of Civil Engineers in the late 1800s. ASTM and the Federal government joined the effort in the early 1900s and ASTM C9 American

Nuclear Magnetic Resonance and X-Ray Absorption Spectroscopic Studies of Lithium Insertion in Silver Vanadium Oxide Cathodes

February 19, 2017
Author(s)
N D. Leifer, A Colon, K Martocci, S G. Greenbaum, Faisal Alamgir, T B. Reddy, N R. Gleason, R A. Leising, E S. Takeuchi
Structural studies have been carried out on Ag2V4O11 (silver vanadium oxide, SVO) and LixAg2V4O11, lithiated SVO with x = 0.72, 2.13 and 5.59 using Nuclear Magnetic Resonance (NMR) and X-ray Absorption Spectroscopy (XAS). Lithium-7 NMR indicates the

Numerical Modeling of Fire Spread Through Individual Trees and Shrubs

February 19, 2017
Author(s)
William E. Mell, Samuel Manzello, Alexander Maranghides
Fire spread through suspended vegetation, such as tree crowns, is a basic component of wildland fires. Most models of fire spread do not resolve the burning of individual trees. Instead, fire spread through a forest canopy, representing a collection tree

On the Aeroelastic Indifference of Brancusi s Endless Column

February 19, 2017
Author(s)
Rene D. Gabbai
Brancusi s Endless Column (T rgu-Jiu, Romania) is an interesting case study in bluff body aeroelasticity. It has been referred to as aeroelastically indifferent owing to its remarkable aeroelastic stability with respect to galloping. The column s behavior

On the Aeroelastic Indifference of Brancusi's Endless Column

February 19, 2017
Author(s)
Rene D. Gabbai
Brancusi s Endless Column (T rgu-Jiu, Romania) has been referred to as aeroelastically indifferent owing to its remarkable aeroelastic stability. The column s behavior has been attributed to its unconventional shape. However, calculations presented here
Displaying 14501 - 14525 of 73896
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