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Displaying 3176 - 3200 of 4212

Holmium Oxide Glass Wavelengths Standards

January 1, 2008
Author(s)
David W. Allen
Holmium oxide glass has been used as a wavelength standard for over four decades. These standards have shown very little variation from batch to batch and from one manufacturer to another. NIST has certified and recertified holmium oxide glass samples for

Securing Radio Frequency Identification (RFID) Systems

May 17, 2007
Author(s)
Karen A. Scarfone
Radio frequency identification (RFID) is a form of automatic identification and data capture technology that uses electric or magnetic fields at radio frequencies to transmit information. An RFID system can be used to identify many types of objects, such

Should You Be Concerned with Software Measurement Uncertainty?

August 1, 2003
Author(s)
Craig M. Shakarji, J D. Raffaldi
The contribution of software to the uncertainty of measurements is an important but often overlooked aspect of uncertainty evaluations. In coordinate metrology, software is often relied upon for complicated fitting of data, filtering, calibrations, and

An Open Framework for the Assembly of Micro- and Nano-Scale Artifacts

June 1, 2003
Author(s)
Shaw C. Feng, Yung-Tsun Lee, Kevin W. Lyons
The design and manufacture of miniature devices have been increasing in both research laboratories and industry. The sizes of the devices continue to decrease to the nanometer scale. At the same time, the complexity of those devices has increased. To

Reliability Improvements in Repair Welding of High Strength Steels

July 1, 2002
Author(s)
Ivan Samardzic, Thomas A. Siewert
Engineers often have to deal with repair of weldments after they have been put into service. Here, the concern is that the service environment may have changed the structure, indepent of whether the problems originated during the initial construction (cold

Ceramic Coatings Metrology Workshop Report

February 1, 2000
Author(s)
S J. Dapkunas
The Ceramic Coatings Metrology Workshop was held at NIST to identify the measurement needs of the various industries that manufacture and use ceramic coatings. The industrial perspectives were complemented by reviews of the scientific issues that require

Vacuum Processing Technique for Development of Primary Standard Blackbodies

June 1, 1999
Author(s)
Magdalena Navarro, Sally Bruce, B. Carol Johnson, A V. Murthy, Robert D. Saunders
Blackbody sources with nearly unity emittance that are in equilibrium with a pure freezing metal such as gold, silver, or copper are used as primary standard sources in the International Temperature Scale of 1990 (ITS-90). Recently, a facility using radio

Test Procedure Development for Residential Dishwashers

May 1, 1999
Author(s)
Natascha S. Milesi-Ferretti
It has been recognized that the current Department of Energy (DOE) dishwasher test procedure is inadequate in testing soil sensing dishwashers. As a result, DOE proposed that NIST evaluate the dishwasher test procedure as a part of their Appliance

Fire-Emulator Detector-Evaluation

October 28, 1998
Author(s)
Artur A. Chernovsky, William L. Grosshandler, Thomas G. Cleary, Michael D. Anderson
The performance of a fire detection system is determined as much by its ability to recognize correctly the non-fire state as to sense the presence of a real fire. Common fire detectors respond to particulate matter in the form of smoke from a flaming or

Dynamics of the Release of Alternate Halon Replacement Agents From Pressurized Bottles

May 11, 1993
Author(s)
William M. Pitts, Jiann C. Yang, B D. Breuel, W G. Cleveland, G. Gmurczyk
Halon 1301 has been widely employed on military and commercial aircraft for fire fighting purposes. Unfortunately, due to the deleterious effects of chlorine and bromine on stratospheric ozone, the manufacture of halon 1301 will be phased out by the end of

Structure of Inhibited Counterflowing Nonpremixed Flames

May 11, 1993
Author(s)
Anthony P. Hamins, M H. Yang, I K. Puri
Recent international agreements call for a halt to the manufacture of CF3Br (Halon 1301), a commonly used halon fire suppressant, due to its high ozone-depletion potential. Ideally, the search for replacement compounds should be guided by fundamental
Displaying 3176 - 3200 of 4212
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