scholarly journals Symmetrical-Waveform High-Frequency Oscillation Increases Artificial Mucus Flow Without Changing Basal Mucus Transport in In Vitro Ovine Trachea

2011 ◽  
Vol 56 (4) ◽  
pp. 435-441 ◽  
Author(s):  
S. Tatkov ◽  
R. J. Pack
Keyword(s):  
High Frequency ◽  
High Frequency Oscillation ◽  
Frequency Oscillation

Augmentation of CO2 elimination during high frequency oscillation by removing the bias tube — an in vitro study

1989 ◽  
Vol 11 (4) ◽  
pp. 334-337 ◽  
Author(s):  
E.H. Bush ◽  
D.R. Spahn ◽  
R. Leuthold ◽  
G. Kopacsy ◽  
P.F. Niederer ◽  
...  
Keyword(s):  
High Frequency ◽  
In Vitro Study ◽  
Vitro Study ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Co2 Elimination

Flow Separation, an Important Mechanism in the Formation of Mean Pulmonary Pressure During High-Frequency Oscillation

1989 ◽  
Vol 111 (1) ◽  
pp. 17-23 ◽  
Author(s):  
E. H. Bush ◽  
D. R. Spahn ◽  
P. F. Niederer ◽  
E. R. Schmid
Keyword(s):  
Flow Separation ◽  
High Frequency ◽  
Oscillatory Flow ◽  
Stationary Flow ◽  
General Mechanism ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Mean Pressure ◽  
Dependent Flow

Mean pressures within the lungs and lung volume, respectively, are clinically important parameters. During ventilation by way of high-frequency oscillation (HFO), these parameters have been shown to be strongly frequency dependent. To identify mechanisms leading to mean pressure formation during HFO, findings of the theory of stationary flow were extended to oscillatory flow by a quasi-stationary approach. To confirm the theoretical findings, in-vitro experiments on HFO-models were performed. Flow separation was found to be an important mechanism in the formation of mean pressure. Flow separation causes a significant flow resistance, which may be distinctly different for in- and outflow. During oscillatory flow, a mean pressure difference thus results. This mechanism is of particular importance in bifurcations, which are present in the HFO-circuit as well as in the airways. With the direction-dependent flow separation, a general mechanism was found, which accounts for differing mean pressure values within the lungs with different HFO-circuits. This mechanism also contributes to interregionally different mean pressure values within the lungs.

High-Frequency Oscillation and Chronic Lung Disease in Very Low Birth Weight Infants

PEDIATRICS ◽  
2001 ◽  
Vol 108 (1) ◽  
pp. 212-214
Author(s):  
J. P. Shenai; ◽  
P. Rimensberger; ◽  
U. Thome ◽  
F. Pohlandt; ◽  
P. Rimensberger
Keyword(s):  
Birth Weight ◽  
Low Birth Weight ◽  
Lung Disease ◽  
Chronic Lung Disease ◽  
High Frequency ◽  
Very Low Birth Weight ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Low Birth Weight Infants

scholarly journals A Comprehensive Investigation on High-Frequency Oscillation in DC Microgrid

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Mohammad Habibullah ◽  
Nadarajah Mithulananthan ◽  
Krischonme Bhumkittipich ◽  
Mohammad Amin
Keyword(s):  
High Frequency ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Comprehensive Investigation ◽  
Dc Microgrid
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