Applications of the Double Frequency Technique in Bubble Sizing and Pressure Measurements in Fluids

1985 ◽  
pp. 753-755
Author(s):  
J. Y. Chapelon ◽  
P. M. Shankar ◽  
V. L. Newhouse
Keyword(s):  
Pressure Measurements ◽  
Double Frequency ◽  
Bubble Sizing

Underwater bubble sizing using a pulsed double frequency technique

1992 ◽  
Vol 92 (2) ◽  
pp. 1177-1179
Author(s):  
Y. Li ◽  
D. Koller ◽  
G. George ◽  
P. M. Shankar ◽  
V. L. Newhouse
Keyword(s):  
Double Frequency ◽  
Bubble Sizing

High-speed bubble sizing using the double frequency technique for oceanographic applications

1992 ◽  
Vol 17 (3) ◽  
pp. 288-291 ◽  
Author(s):  
D. Koller ◽  
Y. Li ◽  
P.M. Shankar ◽  
V.L. Newhouse
Keyword(s):  
High Speed ◽  
Double Frequency ◽  
Bubble Sizing

Signal Interpretation Considerations When Estimating Subglottal Pressure From Oral Air Pressure

2019 ◽  
Vol 62 (5) ◽  
pp. 1326-1337 ◽  
Author(s):  
Brittany L. Perrine ◽  
Ronald C. Scherer ◽  
Jason A. Whitfield
Keyword(s):  
Standard Condition ◽  
Word Production ◽  
Air Pressure ◽  
Pressure Waveform ◽  
Pressure Measurements ◽  
Air Leak ◽  
Pressure Signal ◽  
Adult Participants ◽  
Syllable Repetition ◽  
Subglottal Pressure

Purpose Oral air pressure measurements during lip occlusion for /pVpV/ syllable strings are used to estimate subglottal pressure during the vowel. Accuracy of this method relies on smoothly produced syllable repetitions. The purpose of this study was to investigate the oral air pressure waveform during the /p/ lip occlusions and propose physiological explanations for nonflat shapes. Method Ten adult participants were trained to produce the “standard condition” and were instructed to produce nonstandard tasks. Results from 8 participants are included. The standard condition required participants to produce /pːiːpːiː.../ syllables smoothly at approximately 1.5 syllables/s. The nonstandard tasks included an air leak between the lips, faster syllable repetition rates, an initial voiced consonant, and 2-syllable word productions. Results Eleven oral air pressure waveform shapes were identified during the lip occlusions, and plausible physiological explanations for each shape are provided based on the tasks in which they occurred. Training the use of the standard condition, the initial voice consonant condition, and the 2-syllable word production increased the likelihood of rectangular oral air pressure waveform shapes. Increasing the rate beyond 1.5 syllables/s improved the probability of producing rectangular oral air pressure signal shapes in some participants. Conclusions Visual and verbal feedback improved the likelihood of producing rectangular oral air pressure signal shapes. The physiological explanations of variations in the oral air pressure waveform shape may provide direction to the clinician or researcher when providing feedback to increase the accuracy of estimating subglottal pressure from oral air pressure.

Assessment of Driver Movements during Prolonged Driving Using Seat Pressure Measurements

2011 ◽  
Author(s):  
Bo Wang ◽  
Xiaoping Jin ◽  
Bo Cheng ◽  
Xin Tao
Keyword(s):  
Pressure Measurements

A Case Study: Using Wireline Pressure Measurements to Improve Reservoir Characterization in Tight Formation Gas - Wamsutter Field, Wyoming

2007 ◽  
Author(s):  
Russ A. Schrooten ◽  
Edward C. Boratko ◽  
Harjinder Singh ◽  
Jim McKay ◽  
Debora L. Hallford
Keyword(s):  
Reservoir Characterization ◽  
Pressure Measurements ◽  
Tight Formation
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