NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

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 49501 - 49525 of 73697

Interlayer Exchange Coupling

September 29, 1999
Author(s)
Mark D. Stiles
The extensive research done on interlayer exchange coupling in transition metal multilayers has resulted in a deep understanding of this coupling and a remarkable agreement between theoretical results and measurements. The coupling between two magnetic

The Application of HFCs as Refrigerants

September 24, 1999
Author(s)
David Didion
The technical criteria for using hydrofluorocarbons (HFCs), as refrigerants in the vapor compression cycle, is presented. If thermodynamic performance is to be optimzed, particular attention must be paid to the fluid's critical point and molar heat

A Conceptual Data Model of Datum Systems

September 23, 1999
Author(s)
Michael R. McCaleb
A new conceptual data model that addresses the geometric dimensioning and tolerancing concepts of datum systems, datums, datum features, datum targets, and the relationship among these concepts, is presented. Additionally, a portion of a related data model

Numerical Prediction of Permeability Using a Lattice Boltzmann Method and Optical Coherence Tomography

September 23, 1999
Author(s)
Frederick R. Phelan Jr., Joy Dunkers, C G. Zimba, Kathleen M. Flynn, Richard~undefined~undefined~undefined~undefined~undefined Parnas, R C. Peterson, X Li, J G. Fujimoto
A rapid, non-destructive technique called optical coherence tomography (OCT) is used to image the microstructure of an epoxy/e-glass composite. The raw OCT data is processed and converted to a binary image, and then input into a lattice Boltzmann

Second Advanced Encryption Standard Candidate Conference

September 23, 1999
Author(s)
Morris J. Dworkin
On March 22-23, 1999, nearly two hundred members of the global cryptographic research community gathered in Rome, Italy, for the Second Advanced Encryption Standard Candidate Conference (AES2). AES2 was the second of three conferences sponsored by NIST in

Architecture for Discrete Construction Component Tracking

September 22, 1999
Author(s)
K M. Furlani, William C. Stone
Accurate and timely identification and tracking of construction components are critical to operating a well-managed and cost efficient construction project. Establishing standards to support identification and tracking technologies has the potential to

Securing Web Servers

September 21, 1999
Author(s)
Peter M. Mell, David F. Ferraiolo
This ITL Bulletin enumerates and describes techniques by which one can secure web servers. It categorizes the techniques into security levels to aid in their cost-effective application.

Finned-Tube Evaporator Model With a Visual Interface

September 19, 1999
Author(s)
Piotr A. Domanski
This paper presents a finned-tube evaporator model and its utility when equipped with a window-based interface. The modeling scheme is tube-by-tube and allows for specification of complex refrigerant circuits, modeling refrigerant distribution between

Simulation of Diamond-Ground Surfaces

September 17, 1999
Author(s)
P Koshy, L K. Ives, S Jahanmir
State-of-the-art models available for predicting the characteristics of diamond-ground surfaces entail digitization of wheel topography which limits their practical utility. This paper presents a geometric simulation of surface generation in diamond

Digital Video Test Collection

September 15, 1999
Author(s)
Carolyn M. Schmidt, Paul D. Over
By the end of 1999, the National Institute of Standards and Technology (NIST) plans to release the first installment of a public-domain digital video test collection. This first installment contains a series of digitized videos and their transcripts which

A Matrix Formalism of Hall Effects in Multicarrier Semiconductor Systems

September 14, 1999
Author(s)
Jin S. Kim
In this article, a matrix formalism of the Hall effects is presented for an arbitrary J-fold multicarrier semiconductor system. Explicit formulas are derived for important transport quantities such as the sheet resistance, the Hall coefficient, and the

Heteronuclear NMR and Crystallographic Studies of Wild-Type and H187Q Escherichia Coli Uracil DNA Glycosylase: Electrophilic Catalysis of Uracil Expulsion by a Neutral Histidine 187

September 14, 1999
Author(s)
A C. Drohat, G Xiao, M Tordova, J. Jagadeesh, K Pankiewicz, K A. Watanbe, G L. Gilliland, J T. Stivers
The nature of the putative general acid, His187, in the reaction catalyzed by Escherichia coli uracil DNA glycosylase (UDG) was investigated using X-ray crystallography and NMR spectroscopy. The crystal structures of H187Q UDG, and its complex with uracil

Modeling the Fillet Lifting Defect

September 11, 1999
Author(s)
Clare Bailey, William J. Boettinger
A multi-physics simulation tool is described which has the ability to simulate fluid flow, heat transfer including solidification, and stress evolution in a integrated manner. This modelling framework is used to predict the behavior of two solder materials

A Capacitance Standard Based on Counting Electrons

September 10, 1999
Author(s)
Mark W. Keller, Ali L. Eichenberger, John M. Martinis, Neil M. Zimmerman
A capacitance standard based directly on the definition of capacitance was built. Single-electron tunneling devices were used to place N electrons of charge e onto a cryogenic capacitor C, and the resulting voltage change ΔV was measured. Repeated

Advances in Concrete Mixture Optimisation. Keynote Paper

September 8, 1999
Author(s)
Kenneth A. Snyder, G J. Frohnsdorff, M Simons
The complexity of high performance concrete (HPC) mixture designs continues to increase, along with the number of criteria that a particuhu mixture must satisfy. Robust statistical methods exist that can be used to not only determine the mixture for a

Rapid Melting of Nb - 47 Mass % Ti: Effect of Heating Rate and Grain Size

September 8, 1999
Author(s)
William J. Boettinger, Daniel Josell, Sam R. Coriell, D Basak
The effect of heating rate and grain size on the melting behavior of Nb - 47 mass % Ti is measured. The experimental method uses rapid resistive self-heating of wire specimens at rates between 10(2 superscript) and 104 superscript) K/s and simultaneous

Smoothing of Mirror Substrates by Thin-Film Deposition

September 8, 1999
Author(s)
E Spiller, S Baker, E Parra, Charles S. Tarrio
Superpolished optical flats with high spatial frequency roughness below 0.1 nm have been commercially available for years. However, it is much more difficult to obtain figured optics of similar quality. We have obtained and tested the finish of figured
Displaying 49501 - 49525 of 73697
Was this page helpful?