A method for determining transverse permeability of tight reservoir cores by radial pressure pulse decay measurement

2016 ◽  
Vol 121 (10) ◽  
pp. 7054-7070 ◽  
Author(s):  
Zehao Yang ◽  
Mingzhe Dong ◽  
Shaojie Zhang ◽  
Houjian Gong ◽  
Yajun Li ◽  
...  
Keyword(s):  
Pressure Pulse ◽  
Radial Pressure ◽  
Tight Reservoir ◽  
Transverse Permeability ◽  
Decay Measurement

Stresses Emanating From the Supports of a Cylindrical Shell Produced by a Lateral Pressure Pulse

1972 ◽  
Vol 39 (1) ◽  
pp. 124-128 ◽  
Author(s):  
M. J. Forrestal ◽  
G. E. Sliter ◽  
M. J. Sagartz
Keyword(s):  
Cylindrical Shell ◽  
Shell Theory ◽  
Pressure Pulse ◽  
Integral Transform ◽  
Circular Cylindrical Shell ◽  
Radial Pressure ◽  
Rectangular Pulse ◽  
Wave Fronts ◽  
Timoshenko Type ◽  
Stress Resultant

A semi-infinite, elastic, circular cylindrical shell is subjected to two uniform, radial pressure pulses, one a step pulse and the other a short-duration, rectangular pulse. Solutions for the stresses emanating from both a clamped support and a simple support are presented for a Timoshenko-type shell theory and a shell bending theory. Results from the Timoshenko-type theory are obtained using the method of characteristics, and results from the shell bending theory are obtained using integral transform techniques. Numerical results from both shell theories are presented for the bending stress and the shear stress resultant. Results show that the effects of rotary inertia and shear deformation are important only in the vicinity of the wave fronts. However, if the duration of the pressure pulse is short, maximum stresses can occur in the vicinity of the wave fronts where a Timoshenko-type shell theory is required for realistic response predictions.

scholarly journals Changes of Radial Pressure Pulse in Cold-Stressed Humans; A Clinical Study

2015 ◽  
Vol 4 (1) ◽  
pp. 98
Author(s):  
Jang Han Bae ◽  
Jaeuk U. Kim ◽  
Boncho Ku ◽  
Young Ju Jeon ◽  
Jong Yeol Kim ◽  
...  
Keyword(s):  
Clinical Study ◽  
Pressure Pulse ◽  
Radial Pressure

scholarly journals GTN Induced Change of Radial Pressure Pulse Contour in Cardiomyopathic Patients.

1999 ◽  
Vol 30 (1) ◽  
pp. 141-142
Author(s):  
K. Uebaba ◽  
F.H. Xu ◽  
H. Shibata ◽  
H. Ishiyama ◽  
K. Amano ◽  
...  
Keyword(s):  
Pressure Pulse ◽  
Radial Pressure ◽  
Pulse Contour

scholarly journals Radial Pressure Pulse and Heart Rate Variability in Heat- and Cold-Stressed Humans

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Chin-Ming Huang ◽  
Hsien-Cheh Chang ◽  
Shung-Te Kao ◽  
Tsai-Chung Li ◽  
Ching-Chuan Wei ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Cold Stress ◽  
Thermal Stresses ◽  
Pressure Pulse ◽  
Radial Pressure ◽  
Cold Test ◽  
Spectral Energy ◽  
Arterial Blood ◽  
Heat And Cold Stress

This study aims to explore the effects of heat and cold stress on the radial pressure pulse (RPP) and heart rate variability (HRV). The subjects immersed their left hand into 45°C and 7°C water for 2 minutes. Sixty healthy subjects (age25±4 yr; 29 men and 31 women) were enrolled in this study. All subjects underwent the supine temperature measurements of the bilateral forearms, brachial arterial blood pressure, HRV and RPP with a pulse analyzer in normothermic conditions, and thermal stresses. The power spectral low-frequency (LF) and high-frequency (HF) components of HRV decreased in the heat test and increased in the cold test. The heat stress significantly reduced radial augmentation index (AIr) (P<.05), but the cold stress significantly increased AIr (P<.01). The spectral energy of RPP did not show any statistical difference in0∼10 Hz region under both conditions, but in the region of10∼50 Hz, there was a significant increase (P<.01) in the heat test and a significant decrease in the cold test (P<.01). The changes in AIr induced by heat and cold stress were significantly negatively correlated with the spectral energy in the region of10∼50 Hz (SE10−50 Hz) but not in the region of0∼10 Hz (SE0−10 Hz). The results demonstrated that the SE10−50 Hz, which only possessed a small percentage in total pulse energy, presented more physiological characteristics than the SE0−10 Hzunder the thermal stresses.

scholarly journals A Study of Assessment of Vascular Aging by Locality of the Radial Pressure Pulse Waveform

2000 ◽  
Vol 120 (10) ◽  
pp. 1492-1499 ◽  
Author(s):  
Kazuhiko Amano ◽  
Hitoshi Ishiyama ◽  
Hiroshi Kasahara ◽  
Kazuo Uebaba ◽  
Kenji Takazawa
Keyword(s):  
Pressure Pulse ◽  
Radial Pressure ◽  
Pulse Waveform ◽  
Vascular Aging

Stress-induced changes of radial pressure pulse contours. Analysis according to an arterial model and fourier transformation

1995 ◽  
Vol 56 (1-2) ◽  
pp. 135
Author(s):  
Kazuo Uebaba ◽  
Fenhao Xu ◽  
Hitoshi Ishiyama ◽  
Hiroshi Kasahara ◽  
Kazuhiko Amano ◽  
...  
Keyword(s):  
Fourier Transformation ◽  
Pressure Pulse ◽  
Radial Pressure ◽  
Arterial Model ◽  
Induced Changes

Application of Sphygmography to Detection of Dyspepsia and the Rhinitis

2011 ◽  
Vol 39 (02) ◽  
pp. 271-285 ◽  
Author(s):  
Chin-Ming Huang ◽  
Hsien-Cheh Chang ◽  
Shung-Te Kao ◽  
Tsai-Chung Li ◽  
Yin-Tzu Liao ◽  
...  
Keyword(s):  
Pressure Wave ◽  
Pressure Pulse ◽  
Pulse Wave ◽  
Power Spectra ◽  
Radial Pressure ◽  
Detection Time ◽  
Arterial Pulse ◽  
Significant Difference ◽  
Two Parameters ◽  
Status Position

Diagnosis by radial arterial pulse is very important in Traditional Chinese Medicine (TCM). The objective of this study is to evaluate the effects of detection time and position on the parameters of time- and frequency-domain of radial pulse wave and to differentiate between Dyspepsia and Rhinitis by the statistical analysis of two signal types. A sphygmograph was developed to record radial pressure pulse for spectral analysis. The measurements were expressed as the pressure wave and its frequency. In this study, 135 subjects including the controls, Dyspepsias and Rhinitis were enrolled in this study. The signals were taken from three diagnosis positions of both wrists. Seven parameters of pressure wave and two parameters of spectrum analysis were evaluated by ANOVA test and Tukey's test. The results showed that the effects of detection time and position on the parameters taken from pulse wave were inconsistent. No regular rules or relationship could be established. The power spectra of 10–50 Hz and 13–50 Hz from sphygmography revealed a significant effect of health status, position and their interaction. There was a significant difference in the power spectra of 13–50 Hz between the control and Rhinitis, as well as between the control and Dyspepsia at right Guan position. The results of this study strongly suggest that the spectrum of sphygmogram might be more helpful than the pressure wave signals for detection of Dyspepsia and Rhinitis.

A modified pressure-pulse decay method for determining permeabilities of tight reservoir cores

2015 ◽  
Vol 27 ◽  
pp. 236-246 ◽  
Author(s):  
Zehao Yang ◽  
Qian Sang ◽  
Mingzhe Dong ◽  
Shaojie Zhang ◽  
Yajun Li ◽  
...  
Keyword(s):  
Pressure Pulse ◽  
Tight Reservoir
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