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Displaying 37701 - 37725 of 74066

Pose of I-Beams for Construction Site Automation

September 21, 2004
Author(s)
David E. Gilsinn, Geraldine S. Cheok, Alan M. Lytle
Automation of construction processes can result in reduced project costs and increased worker safety. A process that lends itself to automation is the picking and placing of objects. However, determining the pose (position and orientation) of an object is

Errors due to the reflectivity of calibration targets

September 20, 2004
Author(s)
James P. Randa, Dave K. Walker, Amanda Cox, Robert L. Billinger
For a microwave total-power radiometer, we consider the error introduced by neglecting the difference in the antenna reflection coefficient between when it views a distant scene and when it views a nearby calibration target. An approximate expression is

Refrigeration for Superconductors

September 20, 2004
Author(s)
Ray Radebaugh
Temperatures in the range of 0.05 to 80 K are required for most applications of superconductors. Refrigeration powers range from fractions of a watt for many electronic applications to kilowatts for some large magnet and power applications. This paper

R-22 Replacement Status (in Chinese)

September 17, 2004
Author(s)
J M. Calm, Piotr A. Domanski
Since its initial recognition in 1928 and commercialization in 1936, R-22 has been applied in systems ranging from the smallest window air conditioners to the largest chillers and heat pumps, including those for district cooling and heating. Individual

Residential Nuisance Source Characteristics for Smoke Alarm Testing

September 16, 2004
Author(s)
Thomas G. Cleary
Nuisance scenario tests were performed in the manufactured home used in the Home Smoke Alarm fire test series. The scenario selections were based on what are commonly thought to be causes of residential nuisance alarms, and were designed to mimic normal

The Role of Standards in a Performance-Based Building Regulatory System

September 16, 2004
Author(s)
Richard W. Bukowski
Building regulatory systems consist of regulations adopted into law through whatever legislative or administrative procedures are appropriate to the legal system in place, supported by standards that provide the detail on what is considered necessary or

Semiconductor Metrology Programs at NIST

September 15, 2004
Author(s)
Joaquin (. Martinez, Stephen Knight
The history of the National Bureau of Standards/National Institute of Standards and Technology (NBS/NIST) will be briefly reviewed emphasizing the creation of the National Semiconductor Metrology Program (NSMP) and the Office of Microelectronics Programs

Standardization of LED Measurements Updates

September 15, 2004
Author(s)
Carl C. Miller, Yoshihiro Ohno
The article describes the current LED standards and recommendations. It also discusses the work in Commission Internationale De L Eclairage Technical Committees to form new recommendations for LED measurements of total luminous flux, partial LED flux and

Adiabatic Association of Ultracold Molecules via Magnetic Field Tunable Interactions

September 14, 2004
Author(s)
K Goral, T Koehler, S A. Gardiner, Eite Tiesinga, Paul S. Julienne
We consider in detail the situation of applying a time dependent external magnetic field to a 87Rb atomic Bose-Einstein condensate held in a harmonic trap, in order to adiabatically sweep the interatomic interactions across a Feshbach resonance to produce

Microwave SQUID multiplexer

September 13, 2004
Author(s)
Kent D. Irwin, Konrad Lehnert
We describe a superconducting quantum interference device (SQUID) multiplexer operated at microwave frequencies. The outputs of multiple SQUIDs are simultaneously modulated at different frequencies, frequency-division multiplexed, and amplified using a

Vapour Pressure of Diethyl Phthalate

September 11, 2004
Author(s)
Vladimir Rohac, Kvetoslav Ruzicka, Vlastimil Ruzicka, Dzmitry H. Zaitsau, Gennady J. Kabo, Vladimir Diky, Karel Aim
Measurements of vapour pressure in the liquid phase and of enthalpy of vaporisation and results of calculation of ideal gas properties for diethyl phthalate are reported. The method of comparative ebulliometry, the static method, and the Knudsen mass loss

3rd Annual PKI R&D Workshop Proceedings

September 8, 2004
Author(s)
K I. Sankar, William Polk, Nelson Hastings
NIST hosted the third annual Public Key Infrastructure (PKI) Research Workshop on April 12-14, 2004. The two and a half day event brought together PKI experts from academia, industry, and government to explore the remaining challenges in deploying public

Antenna Gain Factor Equivanlent for TEM Cells

September 6, 2004
Author(s)
Perry F. Wilson
This paper derives a gain factor equivalent for TEM cells. The gain factor is then used in simple transmission fomulas to investigate emissions tests in TEM cells and correlation of TEM cell emissions measuremetns to other methods. The correlation

The Effects of Loading Configurations on the Performance of Reverberation Chambers

September 6, 2004
Author(s)
Christopher L. Holloway, Todd Lammers, John M. Ladbury
The presence of lossy objects in reverberation chamber may significantly disturb the reverberant environment and affect the desired field statistics. In this paper, we present a numerical study of the effects of different loading configurations on the
Displaying 37701 - 37725 of 74066