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Displaying 39026 - 39050 of 73697

Pumice Aggregates for Internal Water Curing

March 17, 2004
Author(s)
Pietro Lura, Dale P. Bentz, D Lange, K Kovler, A Bentur
A novel concept in internal curing of High Performance Concrete is based on dispersing very small, saturated lightweight aggregates (LWA) in the concrete, containing sufficient water to counteract self-desiccation. The amount of water in the LWA can be

Key metrology considerations for fiber Bragg grating sensors

March 14, 2004
Author(s)
Shellee D. Dyer, Paul A. Williams, Robert J. Espejo, Jonathan D. Kofler, Shelley M. Etzel
We discuss the current status of fiber Bragg grating (FBG) sensor metrology. High-accuracy wavelength measurements are critical for FBG strain sensors, because wavelength measurement uncertainties even as small as 1 pm lead to an uncertainty of nearly 1

The First Measurements with Octave-Spanning Femtosecond Laser Frequency Combs

March 13, 2004
Author(s)
Scott A. Diddams, David J. Jones
Here we describe in a historical manner the first optical frequency measurement measurements with octave-spanning frequency combs and the first measurement and stabilization of the carrier-envelope offset frequency for a train of femtosecond laser pulses.

Low temperature optical photon detectors for quantum information applications

March 11, 2004
Author(s)
Sae Woo Nam, Aaron J. Miller, Danna Rosenberg
There is increasing interest in using high-performance cryogenic optical photon detectors in a variety of applications in quantum information science and technology. These applications require detectors that have extremely low dark count rates, high count

Nano-Lithography in Ultra-High Vacuum (UHV) for Real World Applications

March 11, 2004
Author(s)
James D. Gilsinn, Hui Zhou, Bradley N. Damazo, Joseph Fu, Richard M. Silver
As nano-lithography technology improves, more companies and research groups have the capability to create nano-scale structures. Scanning tunneling microscopes (STMs) are commonly used to create these structures and evaluate them afterward. One difficulty

Robust infrared filters for x-ray spectroscopy

March 11, 2004
Author(s)
Nathan A. Tomlin, Joel Ullom, James A. Beall, Gene C. Hilton, Steven Deiker, W.Bertrand (Randy) Doriese, Kent D. Irwin, Carl D. Reintsema, Leila R. Vale, Yizi Xu
One challenge to using cryogenic detectors for x-ray spectroscopy on a scanning electron microscope is the implementation of infrared blocking filters. In order to achieve high x-ray transmission, these filters can be as thin as 250 nm and consequently are

Structural, Electronic and Optical Properties of B-(Fe 1-x Co 2 )Si 2

March 11, 2004
Author(s)
D B. Migas, Leo Miglio, M Rebien, W Henrion, P Stauss, Anthony G. Birdwell, Albert Davydov, V L. Shaposhnikov, V E. Borisenko
Optimized crystal structure, electronic bands and density of states nearby the band gap, and the dielectric function of -(Fe1-xCox)Si2 with x equal to 0.0625 and 0.125 were obtained by means of total energy ultrasoft pseudopotential and full-potential

A Cross-Correlation Based Method for Spatial-Temporal Traffic Analysis

March 10, 2004
Author(s)
Kevin L. Mills, J Yuan
Analyzing spatial-temporal characteristics of traffic in large-scale networks requires both suitable analysis method and a means to reduce the amount of data that must be collected. Of particular interest would be techniques that reduce the amount of data

Minimal Universal Two-Qubit Controlled-NOT-Based Circuits

March 10, 2004
Author(s)
V V. Shende, I L. Markov, Stephen Bullock
We show how to implement an arbitrary two-qubit unitary operation in several universal gate libraries using the smallest possible number of gates. To this end, we prove that n-qubit circuits using CNOT and one-qubit gates require at least [1/4 (4n - 3n -1)

PWB Warpage Analysis and Verification using an AP210 Standards-based Engineering Framework and Shadow Moire

March 10, 2004
Author(s)
Dirk Zwemer, Manas Bajaj, Russell Peak, Thomas Thurman, Kevin G. Brady, S McCarron, A Spradling, Mike Dickerson, Lothar Klein, Giedrius Liutkus, John V. Messina
Thermally induced warpage of printed wiring boards (PWB) and printed circuit assemblies (PCA) is an increasingly important issue in managing the manufacturing yield and reliability of electronic devices. In this paper, we introduce complementary simulation

Temperature Measurements of Semiconductor Devices-A Review

March 10, 2004
Author(s)
David L. Blackburn
There are numerous methods for measuring the temperature of an operating semiconductor device. The methods can be broadly placed into three generic categories; electrical, optical, and physically contacting. The fundamentals underlying each of the

Atmospheric Pressure Microplasmas for Modifying Sealed Microfluidic Devices

March 8, 2004
Author(s)
J K. Evju, P B. Howell, Laurie E. Locascio, Michael J. Tarlov, J J. Hickman
A new DC microdischarge technique for chemical modification of microchannel walls is reported. Our results show that strongly hydrophilic or hydrophobic properties are quickly imparted unto the walls of assembled polymer microchannels in atmospheric

Feature-Based Inspection and Control System

March 8, 2004
Author(s)
Thomas Kramer, John A. Horst, Hui-Min Huang, Elena R. Messina, Frederick M. Proctor, Harry A. Scott
This report describes an architecture and software system for automatically performing process planning and control code generation for cutting and inspecting prismatic piece parts. This "Feature-Based Inspection and Control System" (FBICS) consists of

Tech Note 1458|NIST Measurement Service for DC Standard Resistors

March 8, 2004
Author(s)
Randolph Elmquist, Dean G. Jarrett, George R. Jones Jr., Marlin E. Kraft, Scott H. Shields, Ronald F. Dziuba
At the National Institute of Standards and Technology (NIST), the U.S. representation of the ohm is based on the quantum Hall effect, and it is maintained and disseminated at various resistance levels by working reference groups of standards. This document
Displaying 39026 - 39050 of 73697
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