An official website of the United States government
Here’s how you know
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.
The certification of ITS 90 fixed-point cells from the Ar triple point (83.8058 K) to the Ag freezing point (1234.93 K) is an integral part of the calibration...
Dylan F. Williams, Fabien Ndagijimana, Catherine A. Remley, Joel Dunsmore, Sean Hubert
We present straight-forward models and representations for RF and image mixers, and develop simple rules for transforming electrical problems involving mixers...
We describe a prototype scalable viscometer aimed at facilitating rapid measurements of multiple samples. The device simultaneously measures the viscosity of...
Geraldine S. Cheok, William C. Stone, Alan M. Lytle
This paper presents a discussion of standards requirements for LADAR. Two specific questions are addressed: (1) is there a need for such standards and (2) what...
Nanocomposites based on three different shapes of nanoscale particles, sphere (silica), plate (clay), and tube (carbon nanotube), were prepared and the...
Previously, it has been suggested that in low water-to-cement ratio (w/c) concretes, the coarser cement particles could be replaced by an inert filer with...
R&D policy has not adequately modeled the relevant R&D underinvestment phenomena and thus is unable to characterize, explain, and measure such underinvestment...
Takashi Kashiwagi, F Du, K Winey, K M. Groth, John R. Shields, S Bellayer, H J. Kim, Jack F. Douglas
The effects of the dispersion and concentration of single walled carbon nanotube (SWNT) on the flammability of polymer/SWNT nanocomposites were investigated...
Robert A. Fletcher, R Dobbins, Bruce A. Benner Jr, S Hoeft
Diesel fuels and emissions are composed of numerous hydrocarbon species. Combustion generated or pyrogenic polycyclic aromatic hydrocarbons (PAHs) derived from...
Drago Skrtic, Sanghun Lee, Joseph M. Antonucci, Da-Wei Liu
This study explores how a) resin grafting potential for amorphous calcium phosphate (ACP) and b) particle size of ACP affects physicochemical properties of...
This method is intended for the nondestructive measurement of the relative permittivity and loss tangent of unclad dielectric substrates at microwave...
We have implemented a kinetic Monte-Carlo (KMC) simulation to study the morphologies of Si (111) surfaces etched in NHF. Although our initial simulations...
Ronald G. Dixson, Richard A. Allen, William F. Guthrie, Michael W. Cresswell
The use of critical dimension atomic force microscopes (CD-AFMs) in semiconductor manufacturing, both for process control and as a reference metrology tool, is...
Ndubuisi G. Orji, Theodore V. Vorburger, Joseph Fu, Ronald G. Dixson, C Nguyen, Jayaraman Raja
Line edge roughness measurements using two types of atomic force microscopes and two types of tips are compared. Measurements were made on specially prepared...
John S. Villarrubia, Andras Vladar, Michael T. Postek
The semiconductor electronics industry places significant demands upon secondary electron imaging to obtain dimensional measurements that are used for process...
Instrumentation and metrology are integral to the emerging nanotechnology enterprise, and have been identified by the U. S. National Nanotechnology Initiative...
Compact, time-harmonic, acoustic sources produce waves that decay too slowly to be square-integrable on a line away from the sources. We introduce an inner...
Jun-Feng Song, Li Ma, Eric P. Whitenton, Theodore V. Vorburger
Autocorrelation and cross-correlation functions are proposed for 2D and 3D surface texture comparisons. At the maximum correlation point of the two correlated...
Chang Xu, Tao Wu, Charles M. Drain, J Batteas, Kathryn L. Beers
Surface initiated atom transfer radical polymerization was successfully carried out inside a microchannel, which was formed by placing a patterned poly...
Chang Xu, Tao Wu, Charles M. Drain, J Batteas, Kathryn L. Beers
Gradually altering the monomer composition of the polymerization mixture, surface initiated atom transfer radical polymerization was used to synthesize gradient...
Some issues associated with making quantitative measurements of the arsenic implant dose in silicon by SIMS are described. These include the use of a certified...