scholarly journals THE EFFECT OF SURFACE TENSION ON THE SINTERING ROLE OF METAL ALLOYS. Technical Progress Report.

1967 ◽  
Author(s):  
J.S. Hirschhorn
Keyword(s):  
Surface Tension ◽  
Technical Progress ◽  
Progress Report ◽  
Metal Alloys ◽  
Effect Of Surface

Effect of surface tension of mucosal lining liquid on upper airway mechanics in anesthetized humans

2003 ◽  
Vol 95 (1) ◽  
pp. 357-363 ◽  
Author(s):  
Jason P. Kirkness ◽  
Peter R. Eastwood ◽  
Irene Szollosi ◽  
Peter R. Platt ◽  
John R. Wheatley ◽  
...  
Keyword(s):  
Surface Tension ◽  
Human Subjects ◽  
Upper Airway ◽  
Exogenous Surfactant ◽  
Airway Mechanics ◽  
Before And After ◽  
Airway Opening ◽  
Mucosal Lining ◽  
Effect Of Surface

Upper airway (UA) patency may be influenced by surface tension (γ) operating within the (UAL). We examined the role of γ of UAL in the maintenance of UA patency in eight isoflurane-anesthetized supine human subjects breathing via a nasal mask connected to a pneumotachograph attached to a pressure delivery system. We evaluated 1) mask pressure at which the UA closed (Pcrit), 2) UA resistance upstream from the site of UA collapse (RUS), and 3) mask pressure at which the UA reopened (Po). A multiple pressure-transducer catheter was used to identify the site of airway closure (velopharyngeal in all subjects). UAL samples (0.2 μl) were collected, and the γ of UAL was determined by using the “pull-off force” technique. Studies were performed before and after the intrapharyngeal instillation of 5 ml of exogenous surfactant (Exosurf, Glaxo Smith Kline). The γ of UAL decreased from 61.9 ± 4.1 (control) to 50.3 ± 5.0 mN/m (surfactant; P < 0.02). Changes in Po, RUS, and Po - Pcrit (change = control - surfactant) were positively correlated with changes in γ ( r2 > 0.6; P < 0.02) but not with changes in Pcrit ( r2 = 0.4; P > 0.9). In addition, mean peak inspiratory airflow (no flow limitation) significantly increased ( P < 0.04) from 0.31 ± 0.06 (control) to 0.36 ± 0.06 l/s (surfactant). These findings suggest that γ of UAL exerts a force on the UA wall that hinders airway opening. Instillation of exogenous surfactant into the UA lowers the γ of UAL, thus increasing UA patency and augmenting reopening of the collapsed airway.

scholarly journals Role of non-ferrous coal minerals and by-product metallic wastes in coal liquefaction. Technical progress report, 1 March 1980-31 May 1980

1980 ◽  
Author(s):  
D Garg ◽  
F K Schweighardt ◽  
E N Givens ◽  
J H Clinton ◽  
A R Tarrer ◽  
...  
Keyword(s):  
Technical Progress ◽  
Progress Report ◽  
Coal Liquefaction

Harmonic holes with surface tension in an elastic plane under uniform remote loading

2016 ◽  
Vol 22 (9) ◽  
pp. 1806-1812 ◽  
Author(s):  
Ming Dai ◽  
Peter Schiavone ◽  
Cun-Fa Gao
Keyword(s):  
Surface Tension ◽  
Conformal Mapping ◽  
Linear Equations ◽  
Elastic Plane ◽  
Mean Stress ◽  
Remote Loading ◽  
The Mean ◽  
Non Linear Equations ◽  
Effect Of Surface

Harmonic holes are designed to leave undisturbed the mean stress in an uncut body subjected to a system of prescribed remote loadings. The role of residual surface tension in the design of harmonic holes is an important consideration, which is usually neglected at the macroscale but remains a significant factor in the design of such holes at the nanoscale. We consider the identification of the geometry of a single harmonic hole in an elastic plane subjected to uniform remote loading when residual surface tension is incorporated into the model of deformation. The geometry of the hole is defined by a conformal mapping with certain unknown coefficients determined from a system of non-linear equations. We illustrate our results with several examples. In particular, we show that for a given remote loading and surface tension, the shapes obtained exhibit strong size-dependency. Moreover, we find that the incorporation of the effect of surface tension greatly extends the range of admissible uniform remote loadings that guarantee the existence of harmonic holes.

Sign in / Sign up

Export Citation Format

Share Document