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Displaying records 711 to 720 of 736 records.
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711. Ultrasonic Continuous-Wave Beam-Power Measurements: 1978-1980 International Comparison
Topic: Electronics & Telecommunications
Published: 8/2/1999
Author: Steven Earl Fick
Abstract: Four half-wave resonant, air-backed, x-cut quartz disc transducers designed and fabricated at the National Bureau of Standards (NBS) were circulated among seven laboratories between February 1978 and June 1980. Participants were given detailed instru ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820118

712. Ultrasonic Measurement of the Dynamic Elastic Moduli of Small Metal Samples
Topic: Electronics & Telecommunications
Published: 1/1/1999
Authors: John A Slotwinski, Gerald V. Blessing
Abstract: Ultrasonic velocity measurements were used to determine the dynamic elastic moduli small metal samples to a 2[sigma] measurement uncertainty of less than one percent. The samples were cylindrical in shape, possessing nominal diameters of 12 mm, and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820134

713. Ultrasonic Power Output Measurement by Pulsed Radiation Pressure
Topic: Electronics & Telecommunications
Published: 9/1/1996
Authors: Steven Earl Fick, Franklin R Breckenridge
Abstract: Direct measurements of time-averaged spatially integrated output power radiated into reflectionless water loads can be made with high accuracy using techniques which exploit the radiation pressure exerted by sound on all objects in its path. With an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820048

714. Ultrasonic Research and Applications in the NIST Manufacturing Engineering Laboratory
Topic: Electronics & Telecommunications
Published: 1/1/1999
Authors: Gerald V. Blessing, Steven Earl Fick, Nelson N. Hsu, John A Slotwinski, D Xiang
Abstract: The Ultrasonics Group in the NIST Manufacturing Engineering Laboratory performs research, develops standards, and offers calibration services in support of U.S. industry. Pulsed ultrasonic and acoustic emission techniques are pursued for application ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820103

715. Ultrasonic Research in the NIST Manufacturing Engineering Laboratory
Topic: Electronics & Telecommunications
Published: 1/1/2000
Authors: Gerald V. Blessing, Steven Earl Fick, Nelson N. Hsu, John A Slotwinski
Abstract: The Ultrasonics Standards Group in the Manufacturing Engineering Laboratory of the National Institute of Standards and Technology ( NIST) performs research, develops standards, and offers calibration services in support of United States industry. In ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821923

716. Ultrasonic Velocity Technique for Non-Destructive Quantification of Elastic Moduli Degradation during Creep in Silicon Nitride
Topic: Electronics & Telecommunications
Published: 5/1/2003
Authors: F Lofaj, Gerald V. Blessing, Sheldon Martin Wiederhorn
Abstract: The ultrasonic velocity technique was used for non-destructive quantification of creep damage during interrupted tensile creep tests at 1400 {degrees}C in an advanced silicon nitride, SN 88. The longitudinal and shear wave velocities, Poisson''s rati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821895

717. Ultrasonic leaky Wave Measurements for materials Evaluation
Topic: Electronics & Telecommunications
Published: 1/1/1998
Authors: Nelson N. Hsu, Gerald V. Blessing
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820071

718. Ultrasound Power Measurement Techniques at NIST
Topic: Electronics & Telecommunications
Published: 11/12/1995
Author: Steven Earl Fick
Abstract: Megahertz-frequency sound waves with submillimeter wavelengths are widely used to probe the interior regions of many types of structures. When human tissues are exposed to ultrasound for diagnostic or therapeutic purposes, the applied power levels m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820047

719. Ultrasound Power Measurement by Pulsed Radiation Pressure
Topic: Electronics & Telecommunications
Published: 8/2/1999
Author: Steven Earl Fick
Abstract: In a specially designed radiation force balance (RFB), low-frequency pulse modulation of the incident ultrasound allows high-accuracy measurement of time-averaged spatially-integrated ultrasound power radiated into a reflectionless water load. Errors ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820119

720. Uncertainties in NIST Noise-Temperature Measurements
Series: Technical Note (NIST TN)
Report Number: 1502
Topic: Electronics & Telecommunications
Published: 3/1/1998
Author: James Paul Randa
Abstract: Uncertainty analyses are presented for NIST measurements of noise temperature. All systems currently used in NIST calibrations of thermal-noise sources are treated. These include tuned systems for 30 and 60 MHz, coaxial total-power radiometers for 1 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=11498



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