U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 14351 - 14375 of 73896

Characterization of the Mirror Region With Atomic Force Microscopy

February 19, 2017
Author(s)
Sheldon M. Wiederhorn, Jose Lopez-Cepero, Jay S. Wallace, Jean-Pierre Guin, Theo Fett
In this paper we use atomic force microscopy to investigate the roughness of the mirror region in silica glass. We demonstrate a decrease in surface RMS Roughness from about 0.5 nm to about 0.4 nm with increasing stress intensity factor (0.5KIc to about 0

Combinatorial Tools for Inorganic Thin Films

February 19, 2017
Author(s)
Peter K. Schenck, Debra L. Kaiser
We report the deveopment of a novel dual beam - dual target pulsed laser deposition (PLD) system for the production of compositionally-graded library films for combinatorial thin film materials research. In-situ process monitoring, including high-speed

Contact Area Correction for Random Surface Roughness on Nanoadhesion

February 19, 2017
Author(s)
Seung H. Yang, Huan Zhang, Stephen M. Hsu
Atomic force microscopes (AFM) have been used to measure adhesion at nanoscale between two surfaces. Colloidal probes are often utilized for such measurements because they provide much lower contact pressures and controlled contact geometry, facilitating

Contact Damage Produced in Si and MgO by Nanoindentation

February 19, 2017
Author(s)
B Hockey
TEM has been used to characterize the defect structures produced in Si and Mgo by Berkovich indentation at loads ranging from 0.1 mN to 5 mN. Plane-section observations are used to describe the nature of the defects and their spatial distribution about the

Continuous Monitoring of Particles in an Occupied Home for the Year 2000

February 19, 2017
Author(s)
L A. Wallace, Cynthia H. Reed
Continuous monitors were employed for one year in an occupied townhouse to measure ultrafine, fine and coarse particles, air change rates, wind speed and direction, temperature and relative humidity. A main objective was to document long-term variation in

Controlled Synthesis of Single-Crystalline InN Nanorods

February 19, 2017
Author(s)
Igor Levin, Albert Davydov, O M. Kryliouk, Hyun Jong Park, YongSun Won, T J. Anderson, J P. Kim, J A. Freitas
Single-crystalline InN nanorods were successfully grown on c-Al203, GaN, and Si substrates by non catalytic, template-free hydride metal-organic vapor phase epitaxy (H-MOVPE). Stable gas-phase oligomer formation is proposed as the nucleation mechanism for

Crystallographic Data Sources

February 19, 2017
Author(s)
Vicky L. Karen
Crystallography has a long and successful history of self-organization and was one of the first areas to create numerical scientific databases. Virtually all structure determinations have been archived in databases that allow ready access and complete

Crystallography and Crystal Chemistry of (Ba 1-x Sr x )2TiO 4

February 19, 2017
Author(s)
Winnie Wong-Ng, James A. Kaduk, Debra L. Kaiser, Julia Frank
This paper reports an investigation of the homogeneity range, crystal chemistry and crystallography of a technologically-important (Ba2-xSrx)TiO4 solid solution series. Since the end members of the series - Ba2TiO4 (Pnma (No.62)) and Sr2TiO4 (I4/mmm (No

Data and Informatics Needs in Biomaterials

February 19, 2017
Author(s)
C P. Sturrock
Biomaterials are nonviable materials used in medical devices, that are intended to interact with biological systems. In 2002 the total U.S. Medical device market stood at $77 billion, with global sales estimated at 2-3 times this figure. Approximately 40

Defect Structures Produced in Silicon and MgO by Nanoindentation

February 19, 2017
Author(s)
B Hockey
TEM has been used to characterize residual defect structures produced in 111} Si and 001] MgO by Berkovich nanoindentation at loads ranging from 5 mN to 0.1 mN. The plane-section observations provide a description of the primary defects, found to be

Delamination of Organo-Modified Layered Double Hydroxides in Polyamide 6 by Melt Processing

February 19, 2017
Author(s)
Mauro Zammarano, S Bellayer, Jeffrey W. Gilman, Massimiliano Franceschi, Frederick Beyer, Richard H. Harris Jr., Meriani Sergio
Layered double hydroxide/polyamide 6 nanocomposites (LDH/PA6) were prepared from organo-modified LDH by melt processing. The anionic exchange capacity of LDH was varied in order to investigate its influence on the degree of exfoliation. LDH were dispersed

Determining Crystal Habits From Oberservations of Planar Sections

February 19, 2017
Author(s)
D M. Saylor, G S. Rohrer
A Method is described for reconstructing the crystal habit from the observations of many random planar sections of known orientation. We have generated simulated observations based on five different assumed crystal habits and found that it is possible to

Development of a Real-Time Control System Architecture for Automated Steel Construction

February 19, 2017
Author(s)
Kamel S. Saidi, Robert W. Bunch, Alan M. Lytle, Frederick M. Proctor
The National Institute of Standards and Technology (NIST) is developing a real-time control system for a robotic crane (the NIST RoboCrane) that will perform automated structural steel pick-and-place operations. The control system architecture is based on

Development of Database-Assisted Design for Wind Loads: Current and Future Research

February 19, 2017
Author(s)
Emil Simiu, Fahim H. Sadek, S M. Diniz, Michael A. Riley, S Jang, L W. Lu
Following Irminger s 1894 aerodynamic tests, Flachsbart s pioneering boundary-layer wind tunnel experiments in 1932, and University of Western Ontario (UWO) 1970 s tests, considerable progress has been achieved in low-rise building design for wind. Owing
Displaying 14351 - 14375 of 73896
Was this page helpful?