Acoustical properties of partially reticulated foams with high and medium flow resistance

1986 ◽  
Vol 79 (6) ◽  
pp. 1734-1740 ◽  
Author(s):  
Jean‐F. Allard ◽  
Achour Aknine ◽  
Claude Depollier
Keyword(s):  
Flow Resistance ◽  
Acoustical Properties ◽  
Medium Flow ◽  
Reticulated Foams

scholarly journals EXPRESS: Inspiratory flow patterns with dry powder inhalers of low and medium flow resistance in patients with pulmonary arterial hypertension

2021 ◽  
pp. 204589402110125
Author(s):  
Mariana Faria-Urbina ◽  
Keith Ung ◽  
Laurie Lawler ◽  
Lawrence Zisman ◽  
Aaron Waxman
Keyword(s):  
Flow Resistance ◽  
Inspiratory Effort ◽  
Inspiratory Flow ◽  
Inspiratory Flow Rate ◽  
Vascular Compliance ◽  
Medium Flow ◽  
Increase Rate ◽  
Pulmonary Arterial ◽  
Highly Correlated ◽  
Peak Inspiratory Flow Rate

Inhalation profiles to support use of dry powder inhalers (DPIs) for drug delivery in patients with pulmonary arterial hypertension (PAH) have not been reported. We aimed to evaluate the inspiratory flow pattern associated with low and medium flow resistance DPI devices (RS01-L, RS01-M, respectively) in patients with PAH. This single-center study enrolled patients with PAH associated with connective tissue disease (aPAH,n=10) and idiopathic PAH (iPAH,n=10) to measure the following inhalation parameters: inspiratory effort (kPa), peak inspiratory flow rate (L/min), inhaled volume (L), and flow increase rate (L/s2) using the two devices. We identified a trend toward higher mPAP in the iPAH group (50±13mmHg vs. 40±11mmHg in aPAH;p=0.077). On average, peak inspiratory flow rate was higher with RS01-L vs. RS01-M (84±19.7 L/min vs. 70.4±13.2 L/min; p=0.015). In the overall group, no differences between RS01-L and RS01-M were observed for inhaled volume, inspiratory effort, or flow increase rate. Inhaled volume with RS01-L was higher in aPAH vs iPAH patients: 1.6±0.4L vs. 1.3±0.2L;p=0.042. For the RS01-L, inhaled volume correlated with forced expiratory volume in one second (r=0.460, p=0.030) and forced vital capacity (r=0.50,p=0.015). In patients with aPAH using RS01-L, both inspiratory effort and flow increase rate were highly correlated with pulmonary vascular compliance (r=0.903,p=0.0001 and r=0.906,p=0.001; respectively); while with RS01-M, inspiratory effort was highly correlated with pulmonary vascular compliance (r=0.81,p=0.001). Our data suggest that the use of RS01-L and RS01-M DPI devices allowed adequate inspiratory flow in PAH patients. The correlation between flow increase rate and pulmonary vascular compliance in aPAH deserves further investigation.

Acoustical Properties of Speech as Indicators of Depression and Suicidal Risk

2008 ◽  
Vol 4 ◽  
Author(s):  
Michael Joshua Landau
Keyword(s):  
Multiple Regression ◽  
Energy Band ◽  
Mental States ◽  
Cross Product ◽  
Female Group ◽  
Suicidal Risk ◽  
Energy Bands ◽  
Band Ratio ◽  
Acoustical Properties ◽  
Male Group

Acoustical properties of speech have been shown to be related to mental states such as remission and depression. The objective of this project was to relate the energy in frequency bands with the severity of the mental state using the Beck Depression Inventory (BDI). Recorded speech was obtained from male and female subjects with mental states of remission, depression, and suicidal risk. These subjects had recorded automated and spontaneous speech samples. Multiple regression analysis was used to relate the independent energy band ratio variables with the dependent BDI scores, and thus allow the determination of equitable BDI scores for future patients. For the male group, the square of the 3rd energy band and the cross-product of the 2nd and 3rd energy band were prominent in both the reading and interviewed groups. Therefore the equation with the 2nd lowest Akaike Information Criterion (AIC) score was chosen for the reading male group, and the 1st lowest AIC score was chosen for the interviewed male group. For the female group, the square and cross-product of the 1st and 2nd energy bands were prominent in both the reading and interviewed groups. Therefore the 2nd lowest AIC score was chosen for the reading female group, and the 1st lowest AIC score was chosen for the interviewed female group. The clinician could thus determine the patient’s mood or state of mind by comparing the estimated BDI score with the ranges of total BDI scores: remitted 0 – 20, depressed 15 – 38, suicidal 38 – 46. Keywords: speech, mental states, power spectra, multiple regression, information theoretic criterion

Fluid Flow Resistance Through Hemispherical Dimpled Plates in Parallel and Zigzag Configurations

2018 ◽  
Vol 12 (11) ◽  
pp. 885
Author(s):  
Nasaruddin Salam ◽  
Rustan Tarakka ◽  
Jalaluddin Jalaluddin ◽  
Muh. Setiawan Sukardin
Keyword(s):  
Fluid Flow ◽  
Flow Resistance

On an enclosed-design of chain drives for sucker-rod pumping units used in low and medium flow-rate wells

2018 ◽  
pp. 11-17
Author(s):  
V.M. Valovsky ◽  
◽  
K.V. Valovsky ◽  
I.G. Shamsutdinov ◽  
N.V. Fedoseenko ◽  
...  
Keyword(s):  
Flow Rate ◽  
Sucker Rod ◽  
Medium Flow ◽  
Pumping Units ◽  
Chain Drives

ИССЛЕДОВАНИЯ АКУСТИЧЕСКИХ ХАРАКТЕРИСТИК ВЕРХНЕГО СЛОЯ МОРЯ МЕТОДОМ МНОГОЧАСТОТНОГО АКУСТИЧЕСКОГО ЗОНДИРОВАНИЯ

2020 ◽  
Author(s):  
V.A. Bulanov ◽  
I.V. Korskov ◽  
A.V. Storozhenko ◽  
S.N. Sosedko
Keyword(s):  
High Frequency ◽  
Wave Motion ◽  
High Spatial Resolution ◽  
Wind Waves ◽  
Acoustic Parameter ◽  
Sea Surface ◽  
Near Surface ◽  
Acoustical Properties ◽  
Acoustic Spectroscopy ◽  
Sea Bottom

Описано применение акустического зондирования для исследования акустических характеристик верхнего слоя моря с использованием широкополосных остронаправленных инвертированных излучателей,устанавливаемых на дно. В основу метода положен принцип регистрации обратного рассеяния и отраженияот поверхности моря акустических импульсов с различной частотой, позволяющий одновременно измерятьрассеяние и поглощение звука и нелинейный акустический параметр морской воды. Многочастотное зондирование позволяет реализовать акустическую спектроскопию пузырьков в приповерхностных слоях моря,проводить оценку газосодержания и получать данные о спектре поверхностного волнения при различных состояниях моря вплоть до штормовых. Применение остронаправленных высокочастотных пучков ультразвукапозволяет разделить информацию о планктоне и пузырьках и определить с высоким пространственным разрешением структуру пузырьковых облаков, образующихся при обрушении ветровых волн, и структуру планктонных сообществ. Участие планктона в волновом движении в толще морской воды позволяет определитьпараметры внутренних волн спектр и распределение по амплитудам в различное время.This paper represents the application of acoustic probingfor the investigation of acoustical properties of the upperlayer of the sea using broadband narrow-beam invertedtransducers that are mounted on the sea bottom. Thismethod is based on the principle of the recording of thebackscattering and reflections of acoustic pulses of differentfrequencies from the sea surface. That simultaneouslyallows measuring scattering and absorption of the soundand non-linear acoustic parameter of seawater. Multifrequencyprobing allows performing acoustic spectroscopy ofbubbles in the near-surface layer of the sea, estimating gascontent, and obtaining data on the spectrum of the surfacewaves in various states of the sea up to a storm. Utilizationof the high-frequency narrow ultrasound beams allows us toseparate the information about plankton and bubbles and todetermine the structure of bubble clouds, created during thebreaking of wind waves, along with the structure of planktoncommunities with high spatial resolution. The participationof plankton in the wave motion in the seawater columnallows determining parameters of internal waves, such asspectrum and distribution of amplitudes at different times.

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