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Displaying 3726 - 3750 of 4199

Total Luminous Flux Calibrations of LEDs at NIST

August 1, 2001
Author(s)
Carl C. Miller, Yoshihiro Ohno
The total luminous flux (lumen) is one of the most important characteristics of Light Emitting Diodes (LEDs), and is commonly measured using integrating sphere photometers. Large variations of measurement results are reported among different manufacturers

100 Years of Optical Science and Metrology at NIST

June 1, 2001
Author(s)
William R. Ott
The National Bureau of Standards (NBS) was formed by Congress 100 years ago. The early Bureau was a small organization, founded at the beginning of the age of electricity to promote industrial productivity, commerce, technological progress, and the quality

Luminous Flux Calibrations of LEDs at NIST

May 1, 2001
Author(s)
Carl C. Miller, Yoshihiro Ohno
The total luminous flux (lumen) is one of the most important characteristics of Light Emitting Diodes (LEDs), and is commonly measured using integrating sphere photometers. Large variations of measurement results are reported among different manufacturers

Metrology for Non-Contact Rainbow Thermometry

March 1, 2001
Author(s)
Cary Presser
NIST recently acquired a commercially available, state-of-the-art droplet diagnostic system that determines the size, velocity, and temperature of in-flight individual droplets. This non-contact diagnostic will be used to determine droplet characteristics

Embedded Power Quality Solutions for Computer Numerical Control Machine Tools

January 1, 2001
Author(s)
Bradley N. Damazo, M Stephens, Johannes A. Soons, M A. Donmez
Electric Power Research Institute (EPRI) research and testing, conducted over many years, has indicated that variations in electric power quality can negatively impact end-use equipment. This research and testing has helped to form the theory that the

Challenges in Developing Environmentally Safe Heat Pumping Systems

July 1, 2000
Author(s)
David Didion, J S. Brown
The advent of the global warming crisis has brought about a viewpoint, in many governments, that the halogen family of refrigerants should be replaced, in part or in toto, by the so-called natural refrigerants. For this proposal to be valid it is necessary

Lessons Learned Developing Protocols for the Industrial Virtual Enterprise

October 1, 1998
Author(s)
Martin Hardwick, KC Morris, D L. Spooner, T Rando, Peter O. Denno
The National Industrial Infrastructure Protocols (NIIIP) Consortium formed in 1994 to develop protocols to allow for manufacturers and their suppliers to develop products across the internet. The protocols selected and developed by the NIIIP Consortium

Fabrication of Optics by Diamond Turning

January 1, 1995
Author(s)
Richard L. Rhorer, Christopher J. Evans
The use of special machine tools with single-crystal diamond-cutting tools to produce metal optics is called diamond turning. The manufacture of optical surfaces by diamond turning is relatively new compared to the traditional optical-polishing methods. In

Body Dimensions for Apparel

January 1, 1994
Author(s)
Yung-Tsun T. Lee
… a compilation of body dimensions that are used in the manufacturing and fitting of apparel. It is the result of …

Far-UVC: The impact of optical filters on real-world deployment

July 20, 2024
Author(s)
C Cameron Miller, Ewan Eadie, Paul O'Mahoney, Sally Ibbotson, Kenneth Wood
In 2015, a study showed that Krypton-Chloride (KrCl) excimer lamps could induce erythema and basal layer DNA damage in human skin. Later studies found that filtering out longer wavelength emissions from these lamps resulted in no acute skin effects

Rapid chemical screening of microplastics and nanoplastics by thermal desorption and pyrolysis mass spectrometry with unsupervised fuzzy clustering

August 11, 2023
Author(s)
Thomas P. Forbes, John Pettibone, Eric S. Windsor, Joseph M. Conny, Robert A. Fletcher
The transport and chemical identification of microplastics and nanoplastics (MNPs) are critical to the concerns over plastic accumulation in the environment. Chemically and physically transient MNP species present unique challenges for isolation and
Displaying 3726 - 3750 of 4199
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