Estimation of elastic properties in the urethral flow controlling zone by signal analysis of urodynamic pressure/flow data

1989 ◽  
Vol 27 (3) ◽  
pp. 314-321 ◽  
Author(s):  
H. Teriö ◽  
A. Spångberg ◽  
A. Engberg ◽  
P. Ask
Keyword(s):  
Elastic Properties ◽  
Signal Analysis ◽  
Flow Data ◽  
Pressure Flow

Pressure-Flow Measurements for Selected Oral and Nasal Sound Segments Produced by Normal Adults

1992 ◽  
Vol 29 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Meri L. Andreassen ◽  
Bonnie E. Smith ◽  
Thomas W. Guyette
Keyword(s):  
Limited Information ◽  
Flow Data ◽  
Female Adult ◽  
Flow Measurements ◽  
Pressure Flow ◽  
Orifice Area ◽  
Normative Pressure ◽  
Categorization Scheme ◽  
Velopharyngeal Function ◽  
Normal Adults

Pressure-flow data are often used to provide information about the adequacy of velopharyngeal valving for speech. However, there is limited information available concerning simultaneous pressure-flow measurements for oral and nasal sound segments produced by normal speakers. This study provides normative pressure, flow, and velopharyngeal orifice area measurements for selected oral and nasal sound segments produced by 10 male and 10 female adult speakers. An aerodynamic categorization scheme of velopharyngeal function, including one typical category and three atypical categories (open, closed, and mixed) is proposed.

Perceptual Evaluation of Velopharyngeal Competency

1980 ◽  
Vol 89 (5_suppl) ◽  
pp. 153-157 ◽  
Author(s):  
Betty Jane Philips
Keyword(s):  
Public School ◽  
Education And Training ◽  
Flow Data ◽  
Speech Language Pathologists ◽  
Pressure Flow ◽  
Perceptual Evaluation ◽  
Speech Characteristics ◽  
Velopharyngeal Incompetence ◽  
And Training

Eight public school speech/language pathologists estimated velopharyngeal competence on the basis of perceptual evaluation of speech characteristics of 24 subjects. These evaluations were made from tape-recorded speech samples. After orientation to a system for scoring speech characteristics associated with velopharyngeal incompetence they reevaluated the same 24 subjects. The evaluations were found to improve significantly with orientation and to correlate well with experts' live evaluations as well as evaluations based on instrumentation which included telefluorography, manometric and pressure-flow data. It was concluded that speech/language pathologists, who by nature of their education and training have expertise in identification of speech deviations, can apply their skills effectively in identifying velopharyngeal incompetence. Further it was suggested that orientation to a system for weighing speech characteristics related to velopharyngeal competency can improve their estimates.

Analysis of Venturi Performance for Gas-Particle Flows

1990 ◽  
Vol 112 (1) ◽  
pp. 121-127 ◽  
Author(s):  
F. D. Shaffer ◽  
R. A. Bajura
Keyword(s):  
Single Phase ◽  
Stokes Number ◽  
Differential Pressure ◽  
Mass Loading ◽  
Flow Data ◽  
Basic Principles ◽  
Pressure Flow ◽  
Experimental Calibration ◽  
Particle Flows ◽  
Improve Correlation

In recent years, use of the venturi for measurement of gas-particle flows has received considerable attention. The technology for the venturi as a single-phase flowmeter has matured to the point that application is routine. Much more research, however, is required to establish the venturi as an acceptable gas-particle flowmeter. The first part of this paper consists of a discussion of the basic principles of venturi pressure-flow performance for gas-particle flows. This is followed by a description of the experimental calibration of a venturi for measurement of gas-particle flows with particle-to-gas mass-loading ratios up to 35. Next, a modified Stokes number is presented and shown to improve correlation of venturi pressure-flow data. Finally, the predictions of a model presented by Doss are compared with the pressure-flow data of the venturi calibration performed in this work. The Doss model provides good predictions of venturi differential pressures for particle-to-gas mass-loading ratios less than ten but tends to overpredict the differential pressure, by as much as 45 percent, for particle-to-gas mass-loading ratios above 10.

Pressure/flow modeling and induced seismicity resulting from two decades of high-pressure deep-well brine injection, Paradox Valley, Colorado

Geophysics ◽  
2016 ◽  
Vol 81 (5) ◽  
pp. B119-B134 ◽  
Author(s):  
Vanessa M. King ◽  
Lisa V. Block ◽  
Christopher K. Wood
Keyword(s):  
Induced Seismicity ◽  
Model Parameters ◽  
Significant Heterogeneity ◽  
Far Field ◽  
Flow Data ◽  
Pressure Flow ◽  
Wellhead Pressure ◽  
Daily Average ◽  
Injection Flow

The Bureau of Reclamation operates a deep injection well near Paradox Valley, Colorado. Intermittent injection testing began in 1991, followed by near-continuous injection since 1996. Daily average injection flow rates and surface injection pressures have been recorded since 1991, and seismicity has been monitored since 1985. Before the injection flow rate was decreased in 2013 in response to the largest induced earthquake to date, observed wellhead pressures were increasing and approaching the maximum permitted pressure. Potential solutions were needed to provide long-term reductions in wellhead pressures and to minimize the occurrence of future large-magnitude induced earthquakes. A key step in this process is to establish whether the trend of increasing pressures is more likely caused by far-field reservoir pressurization or near-well flow impairment. The spatiotemporal occurrence of induced seismicity is fit relatively well by a 1D diffusive triggering front relationship, suggesting that the reservoir can be modeled as a porous medium. Simple 1D, uncoupled porous models are therefore used to analyze the wellhead pressure response for the period of long-term injection. These simple models are found to provide a reasonable fit to the pressure/flow data. We did not observe the expected changes in the model parameters that would indicate significant near-well flow impairment, and thus we have concluded that the observed pressure increase is more likely related to far-field pressurization. Somewhat surprisingly, given the complex geologic structure and the heterogeneity in the locations of induced seismicity, the analysis demonstrates the ability of a simple radially symmetric porous model to fit the pressure/flow data in the near-well area (within approximately 2 km). Although the induced seismicity data suggest significant heterogeneity, the daily average wellhead pressure/flow data are insensitive to these features. In the absence of additional constraints, use of more complicated models is unlikely to produce substantial additional benefit for modeling in the near-well area.

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