Measurement methods for high-performance jet aircraft noise inside a hardened aircraft shelter

2017 ◽  
Vol 142 (4) ◽  
pp. 2514-2514
Author(s):  
Richard L. McKinley ◽  
Alan T. Wall ◽  
Theo A. van Veen ◽  
Jaap van't Hof
Keyword(s):  
High Performance ◽  
Measurement Methods ◽  
Aircraft Noise

Field Studies of Habituation to Change in Nighttime Aircraft Noise and of Sleep Motility Measurement Methods

1998 ◽  
Author(s):  
Sanford Fidell ◽  
Richard Howe ◽  
Barbara Tabachnick ◽  
Karl Pearsons ◽  
Laura Silvati ◽  
...  
Keyword(s):  
Field Studies ◽  
Measurement Methods ◽  
Aircraft Noise

scholarly journals Electromechanical Response of Smart Ultra-High Performance Concrete under External Loads Corresponding to Different Electrical Measurements

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1281
Author(s):  
Min Kyoung Kim ◽  
Huy Viet Le ◽  
Dong Joo Kim
Keyword(s):  
Electrical Resistivity ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Measurement Methods ◽  
Electrical Measurements ◽  
Ultra High Performance Concrete ◽  
Ac Measurement ◽  
External Loads ◽  
Functional Fillers

This study investigated the electromechanical response of smart ultra-high-performance concretes (smart UHPCs), containing fine steel slag aggregates (FSSAs) and steel fibers as functional fillers, under external loads corresponding to different measurement methods. Regardless of different measurement methods of electrical resistance, the smart UHPCs under compression showed a clear reduction in their electrical resistivity. However, under tension, their electrical resistivity measured from direct current (DC) measurement decreased, whereas that from alternating current (AC) measurement increased. This was because the electrical resistivity, from DC measurement, of smart UHPCs was primarily dependent on fiber crack bridging, whereas that from AC measurement was dependent on tunneling effects.

scholarly journals Comparison of Measurement Methods for Dermal Exposure to Hazardous Chemicals at the Workplace: The SysDEA Project

2019 ◽  
Vol 64 (1) ◽  
pp. 55-70 ◽  
Author(s):  
Konstantinos M Kasiotis ◽  
Suzanne Spaan ◽  
Angelos N Tsakirakis ◽  
Remy Franken ◽  
Ilianna Chartzala ◽  
...  
Keyword(s):  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
High Viscosity ◽  
Dermal Exposure ◽  
Measurement Methods ◽  
Test Substance ◽  
Fluorescence Detector ◽  
Systematic Analysis ◽  
Surface Areas ◽  
Hazardous Chemical

Abstract There is a principal need for more precise methodology with regard to the determination of occupational dermal exposure. The goal of the Systematic analysis of Dermal Exposure to hazardous chemical Agents at the workplace project was therefore to generate scientific knowledge to improve and standardize measurement methods for dermal exposure to chemicals at the workplace. In addition, the comparability of different measurement methods was investigated. Different methods (body sampling by means of coveralls and patches, hand sampling by means of gloves and washing, and head sampling by means of headbands and wiping) were compared. Volunteers repeatedly performed a selection of tasks under standardized conditions in test chambers to increase the reproducibility and decrease variability. The selected tasks were pouring, rolling, spraying, and handling of objects immersed in liquid formulations, as well as dumping and handling objects contaminated with powder. For the chemical analysis, the surrogate test substance Tinopal SWN was analyzed by means of a high-performance liquid chromatographic method using a fluorescence detector. Tinopal SWN was either applied as a solid product in its pure form, or as a low and high viscosity liquid containing Tinopal SWN in dissolved form. To compare the sampling methods with patches and coveralls, the exposure values as measured on the patches were extrapolated to the surface areas of the respective parts of the coverall. Based on this extrapolation approach, using the patch method resulted in somewhat higher exposure values compared to using a coverall for all exposure situations, but the differences were only statistically significant in case of the liquid exposure situations. Using gloves resulted in significantly higher exposure values compared to hand wash for handling immersed objects, rolling, and handling contaminated objects, and slightly higher (not significant) exposure values during pouring and spraying. In the same context, applying wipe sampling resulted in higher exposure values than using a headband, which was at least partly due to extrapolation of the wipe results to the surface area of the headband. No ‘golden standard’ with regard to a preferred measurement method for dermal exposure could be identified from the methods as investigated in the current study.

scholarly journals Three-Way Spectral Decompositions of High-Performance Military Aircraft Noise

AIAA Journal ◽  
2019 ◽  
Vol 57 (8) ◽  
pp. 3467-3479 ◽  
Author(s):  
Tracianne B. Neilsen ◽  
Aaron B. Vaughn ◽  
Kent L. Gee ◽  
S. Hales Swift ◽  
Alan T. Wall ◽  
...  
Keyword(s):  
High Performance ◽  
Aircraft Noise ◽  
Military Aircraft ◽  
Spectral Decompositions

Near-field acoustical holography applied to high-performance jet aircraft noise

2010 ◽  
Author(s):  
Alan T. Wall ◽  
Kent L. Gee ◽  
Michael D. Gardner ◽  
Tracianne B. Neilsen ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Near Field ◽  
Aircraft Noise ◽  
Acoustical Holography

scholarly journals Performance of Caffeine Content Analysis in Robusta sp and Theobroma cacao L using Iodometry, UV-Vis Spectrophotometry and High Performance Liquid Chromatography

2020 ◽  
Vol 9 (3) ◽  
pp. 212-221
Author(s):  
Yeanchon H. Dulanlebit ◽  
◽  
Nikmans Hattu ◽  
Ritti P. Sangadji ◽  
Risma Mahulette ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Content Analysis ◽  
Liquid Chromatography ◽  
Theobroma Cacao ◽  
High Performance ◽  
Measurement Methods ◽  
Caffeine Content ◽  
Rotary Evaporator ◽  
Theobroma Cacao L

Caffeine is a xanthine alkaloid compound found in Robusta sp and Theobroma cacao L. The caffeine extract was obtained by evaporating CHCl3 using a rotary evaporator and determine its content using iodometry, UV-Vis spectrophotometry and High Performance Liquid Chromatography, then validated by measurement methods. The iodometric caffeine content in Theobroma cacao L is 900 mg/kg while UV-Vis spectrophotometry is 4,000 mg/kg, and for HPLC in Robusta sp is 19,475 mg/kg. The iodometry performance gives the linearity value, R2 of 0.9791. The precision values at 5.0 mg/L and 15.0 mg/L are 4.6% and 8.3%. Accuracy for 5.0; 10.0; and 15.0 mg/L are 106%, 100% and 94% respectively. The performance of UV-Vis spectrophotometry gives linearity value, R2 of 0.9948. The precision value at 1.0 mg/L and 6.0 mg/L gives the variance coefficient value of 4.2% and 1.2%, while the accuracy at 1.0 mg/L and 6.0 mg/L are 99% and 101%.

Characterization of near‐ and far‐field nonlinearity in high‐performance military jet aircraft noise.

2010 ◽  
Vol 127 (3) ◽  
pp. 1877-1877
Author(s):  
Tracianne B. Neilsen ◽  
Kent L. Gee ◽  
J. Micah Downing ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Aircraft Noise ◽  
Far Field

Experimental comparison of high-performance water vapor permeation measurement methods

2014 ◽  
Vol 15 (12) ◽  
pp. 3746-3755 ◽  
Author(s):  
Giovanni Nisato ◽  
Hannes Klumbies ◽  
John Fahlteich ◽  
Lars Müller-Meskamp ◽  
Peter van de Weijer ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Performance ◽  
Measurement Methods ◽  
Experimental Comparison ◽  
Vapor Permeation ◽  
Water Vapor Permeation
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