F-0717 The Relationship between Local Cross-sectional Area and Local Internal Pressure in Highly Deformed Collapsible Tube during Self-excited Oscillation

2001 ◽  
Vol VI.01.1 (0) ◽  
pp. 91-92
Author(s):  
Kenichi HANAZONO ◽  
Kenkichi OHBA ◽  
Kiyoshi BANDO ◽  
Atsushi SAKURAI ◽  
Tadayuki KAMIMURA ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Collapsible Tube ◽  
Cross Sectional ◽  
Excited Oscillation ◽  
The Relationship

Identification of the biomechanical factors associated with the perception of distension in the human esophagus

2002 ◽  
Vol 282 (4) ◽  
pp. G683-G689 ◽  
Author(s):  
J. D. Barlow ◽  
H. Gregersen ◽  
D. G. Thompson
Keyword(s):  
Cross Sectional Area ◽  
Sectional Area ◽  
Limited Information ◽  
Butyl Bromide ◽  
Cross Sectional ◽  
Impedance Planimetry ◽  
Sensory Responses ◽  
Human Esophagus ◽  
Biomechanical Factors ◽  
The Relationship

Current techniques used to investigate the mechanisms responsible for the sensory responses to distension of the human esophagus provide limited information because the degree of circumferential stretch required to determine tension can only be inferred. We used impedance planimetry to measure the cross-sectional area during esophageal distension to ascertain the degree of stretch and tension that initiated motor and sensory responses. Hyoscine- N-butyl bromide (HBB), a cholinergic muscarinic receptor blocker, was also used to alter esophageal tension during distension. Motor activity was initiated at a lower degree of stretch and tension than that which initiated sensory awareness; both increased directly with increasing distension. HBB reduced both esophageal motility and tension during distension without altering the relationship between sensation intensity and cross-sectional area. Esophageal stretch, rather than tension, thus appears to be the major factor influencing sensory responses to esophageal distension.

Changes in airway length after unilateral pneumonectomy in weanling ferrets

1990 ◽  
Vol 68 (1) ◽  
pp. 187-192 ◽  
Author(s):  
K. K. Kirchner ◽  
J. T. McBride
Keyword(s):  
Quadratic Equation ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Peripheral Airways ◽  
Peripheral Airway ◽  
The Relationship ◽  
Bronchial Casts ◽  
Central Airway ◽  
Terminal Bronchiole

We have previously shown that airway cross-sectional area increases 15-20% after pneumonectomy in weanling ferrets by measuring bronchial casts. We have now reanalyzed these same casts to quantitate changes in airway length after pneumonectomy. In each cast the distance from each of 120 airways to the terminal bronchiole along its axial pathway was measured. The relationship between the logarithm of this distance and that of the fraction of the lobe subtended by an airway could be described by a quadratic equation with a correlation coefficient greater than 0.85. Subsegmental and more distal airways of postpneumonectomy animals were 33-47% longer than those of controls. Overall the main axial pathway of airways in the left lower lobes was 12% longer in operated animals, but this increase was primarily accounted for by an increase in the length of the more peripheral airways. Central airways were little if any longer in operated animals. After pneumonectomy in weanling ferrets, subsegmental and peripheral airway lengths increase to a greater degree than lung volume and airway cross-sectional area, whereas central airway lengths increase to a lesser extent if at all. The mechanisms responsible for this difference between central and intralobar compensatory airway growth are unknown.

The relationship between jaw-opening force and the cross-sectional area of the suprahyoid muscles in healthy elderly

2017 ◽  
Vol 45 (3) ◽  
pp. 222-227 ◽  
Author(s):  
E. Kajisa ◽  
H. Tohara ◽  
A. Nakane ◽  
Y. Wakasugi ◽  
K. Hara ◽  
...  
Keyword(s):  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Suprahyoid Muscles ◽  
Healthy Elderly ◽  
Jaw Opening ◽  
The Cross ◽  
The Relationship

CORRELATION BETWEEN BODY HABITUS AND CROSS-SECTIONAL AREA OF RIBS

1965 ◽  
Vol 43 (5) ◽  
pp. 773-781 ◽  
Author(s):  
Hideaki Takahashi ◽  
Harold M. Frost
Keyword(s):  
Sampling Site ◽  
Correlation Coefficients ◽  
Correlation Study ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Body Habitus ◽  
Normal People ◽  
Total Cross Sectional Area ◽  
The Relationship

A correlation study was performed of the relationship between the total cross-sectional area of the fifth, sixth, or seventh rib in its middle third, and the height, weight, and sex of its owner. The study involved 115 metabolically normal people and yielded high correlation coefficients between the calculated and observed total rib cross-sectional areas of 60 males and 55 females. It is suggested that the total cross-sectional area at a standard bone sampling site be used as a basis for normalizing measures of the severity of osteoporosis. This would allow one to make improved comparisons of the severity of osteoporosis between persons of different body habitus and sex.

The Relationship Between Changes In Rmssd And Rectus Femoris Cross-sectional Area Following Exercise

2017 ◽  
Vol 49 (5S) ◽  
pp. 901-902
Author(s):  
Thomas J. Kopec ◽  
Bailey A. Welborn ◽  
James E. Leeper ◽  
Elizabeth E. Hibberd ◽  
Phillip A. Bishop ◽  
...  
Keyword(s):  
Rectus Femoris ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
The Relationship

Tailrace surge shaft optimization procedure for minimum downsurge

2018 ◽  
Vol 45 (6) ◽  
pp. 446-457
Author(s):  
Satyajeet Sinha
Keyword(s):  
Optimization Procedure ◽  
Water Velocity ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Tailrace Tunnel ◽  
The Cross ◽  
The Cost ◽  
Low Pressures ◽  
The Relationship

Tailrace surge shafts are required in hydropower projects where the spent water is conveyed through a long tailrace tunnel under pressure to the recipient. Startup and shutdown of the turbine can cause sudden changes in water velocity and can develop dangerously high and low pressures. Surge shafts are provided in water conductor systems to significantly reduce these pressure surges. Based on numerous transient analyses carried out, it was observed that the cross-sectional area of the tailrace surge shaft can be optimized based on the relationship between the differences in the tailwater level and the minimum downsurge level at the tailrace surge shaft obtained with respect to the different lengths of the tailrace tunnel and different cross-sectional areas of the tailrace surge shaft. In this study, a procedure was proposed by which the tailrace surge shafts can be optimized and, hence, the cost of the hydropower projects with tailrace surge shafts can be minimized.

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