scholarly journals A Fast UTD-Based Method for the Analysis of Multiple Acoustic Diffraction over a Series of Obstacles with Arbitrary Modeling, Height and Spacing

Symmetry ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 654
Author(s):  
Domingo Pardo-Quiles ◽  
José-Víctor Rodríguez
Keyword(s):  
Graph Theory ◽  
Computational Efficiency ◽  
Acoustic Waves ◽  
Sound Attenuation ◽  
Accurate Prediction ◽  
Multiple Diffraction ◽  
Uniform Theory Of Diffraction ◽  
Novel Approach ◽  
Acoustic Diffraction ◽  
Good Agreement

A uniform theory of diffraction (UTD)-based method for analysis of the multiple diffraction of acoustic waves when considering a series of symmetric obstacles with arbitrary modeling, height and spacing is hereby presented. The method, which makes use of graph theory, funicular polygons and Fresnel ellipsoids, proposes a novel approach by which only the relevant obstacles and paths of the scenario under study are considered, therefore simultaneously providing fast and accurate prediction of sound attenuation. The obstacles can be modeled either as knife edges, wedges, wide barriers or cylinders, with some other polygonal diffracting elements, such as doubly inclined, T- or Y-shaped barriers, also considered. In view of the obtained results, this method shows good agreement with previously published formulations and measurements whilst offering better computational efficiency, thus allowing for the consideration of a large number of obstacles.

scholarly journals A Novel Approach to Measure the Hydraulic Capacitance of a Microfluidic Membrane Pump

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Chun-Hui Wu ◽  
Chia-Wei Chen ◽  
Long-Sheng Kuo ◽  
Ping-Hei Chen
Keyword(s):  
Linear Correlation ◽  
Experimental Results ◽  
Membrane Thickness ◽  
Membrane Pump ◽  
Novel Approach ◽  
Hydraulic Capacitance ◽  
Linear And Nonlinear ◽  
Center Deflection ◽  
Membrane Deflection ◽  
Good Agreement

A novel approach was proposed to measure the hydraulic capacitance of a microfluidic membrane pump. Membrane deflection equations were modified from various studies to propose six theoretical equations to estimate the hydraulic capacitance of a microfluidic membrane pump. Thus, measuring the center deflection of the membrane allows the corresponding pressure and hydraulic capacitance of the pump to be determined. This study also investigated how membrane thickness affected the Young’s modulus of a polydimethylsiloxane (PDMS) membrane. Based on the experimental results, a linear correlation was proposed to estimate the hydraulic capacitance. The measured hydraulic capacitance data and the proposed equations in the linear and nonlinear regions qualitatively exhibited good agreement.

A Novel Approach to Photoacoustic FT-IR Spectroscopy: Rheo-Photoacoustic Measurements

1989 ◽  
Vol 43 (8) ◽  
pp. 1387-1393 ◽  
Author(s):  
William F. McDonald ◽  
Hans Goeitler ◽  
Marek W. Urban
Keyword(s):  
Molecular Structure ◽  
Thin Films ◽  
Fourier Transform ◽  
Acoustic Waves ◽  
Polymeric Materials ◽  
Photoacoustic Signal ◽  
Novel Approach ◽  
Ft Ir ◽  
Property Changes ◽  
Ft Ir Spectroscopy

A new rheo-photoacoustic Fourier transform infrared cell has been developed to perform stress-strain studies on polymeric materials. The rheo-photoacoustic measurements lead to the enhancement of the photoacoustic signal and allow one to monitor the effect of elongational forces on the molecular structure of polymers. Propagating acoustic waves are detected as a result of the deformational changes and thermal property changes upon the applied stress. Applications of this technique to fibers, films, and adhesion of thin films are presented.

Protein Interactions for Functional Genomics

2012 ◽  
Vol 3 (4) ◽  
pp. 15-30
Author(s):  
Pablo Minguez ◽  
Joaquin Dopazo
Keyword(s):  
Graph Theory ◽  
Protein Interactions ◽  
Biological Networks ◽  
State Of The Art ◽  
Protein Protein Interactions ◽  
Pairwise Interactions ◽  
Novel Approach ◽  
Functional Profiling ◽  
Available Resources

Here the authors review the state of the art in the use of protein-protein interactions (ppis) within the context of the interpretation of genomic experiments. They report the available resources and methodologies used to create a curated compilation of ppis introducing a novel approach to filter interactions. Special attention is paid in the complexity of the topology of the networks formed by proteins (nodes) and pairwise interactions (edges). These networks can be studied using graph theory and a brief introduction to the characterization of biological networks and definitions of the more used network parameters is also given. Also a report on the available resources to perform different modes of functional profiling using ppi data is provided along with a discussion on the approaches that have typically been applied into this context. They also introduce a novel methodology for the evaluation of networks and some examples of its application.

On the Influence of Obstacle Modeling in Multiple Diffraction of Acoustic Waves

2019 ◽  
Vol 105 (2) ◽  
pp. 261-264 ◽  
Author(s):  
Domingo Pardo-Quiles ◽  
José-Víctor Rodríguez ◽  
Rubén Lozano-Giménez ◽  
Leandro Juan-Llácer ◽  
Juan Pascual-García
Keyword(s):  
Acoustic Waves ◽  
Multiple Diffraction

scholarly journals Acoustic Signatures of the Phases and Phase Transitions in the Blume Capel Model with Random Crystal Field

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Gul Gulpinar
Keyword(s):  
High Frequency ◽  
Sound Propagation ◽  
Ultrasonic Attenuation ◽  
Experimental Studies ◽  
Power Laws ◽  
Sound Attenuation ◽  
Irreversible Processes ◽  
Acoustic Signatures ◽  
Sound Dispersion ◽  
Good Agreement

Sound propagation in the Blume Capel model with quenched diluted single-ion anisotropy is investigated. The sound dispersion relation and an expression for the ultrasonic attenuation are derived with the aid of the method of thermodynamics of irreversible processes. A frequency-dependent dispersion minimum that is shifted to lower temperatures with rising frequency is observed in the ordered region. The thermal and sound frequency (ω) dependencies of the sound attenuation and effect of the Onsager rate coefficient are studied in low- and high-frequency regimes. The results showed that ωτ≪1 and ωτ≫1 are the conditions that describe low- and high-frequency regimes, where τ is the single relaxation time diverging in the vicinity of the critical temperature. In addition, assuming a linear coupling of sound wave with the order parameter fluctuations in the system and ε as the temperature distance from the critical point, we found that the sound attenuation follows the power laws α(ω,ε)~ω2ε-1 and α(ω,ε)~ω0ε1 in the low- and high-frequency regions, while ε→0. Finally, a comparison of the findings of this study with previous theoretical and experimental studies is presented and it is shown that a good agreement is found with our results.

scholarly journals A novel approach for the accurate prediction of thoracic surgery workforce requirements in Canada

2014 ◽  
Vol 148 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Janet P. Edwards ◽  
Indraneel Datta ◽  
John Douglas Hunt ◽  
Kevin Stefan ◽  
Chad G. Ball ◽  
...  
Keyword(s):  
Thoracic Surgery ◽  
Accurate Prediction ◽  
Novel Approach

Direct elastic properties to resistivity transforms

Geophysics ◽  
2016 ◽  
Vol 81 (5) ◽  
pp. IM109-IM118
Author(s):  
Dimitrios Economou ◽  
Behzad Alaei
Keyword(s):  
Water Saturation ◽  
Data Sets ◽  
Seismic Velocities ◽  
Even Start ◽  
Novel Approach ◽  
Multivariate Nonlinear Regression ◽  
Subsurface Resistivity ◽  
Relationship Of ◽  
Norwegian Continental Shelf ◽  
Good Agreement

Numerous publications have dealt with estimations of resistivity from elastic parameters and vice versa. Attempts have been made in the cross-property relationship of elastic and electric properties, in particular, velocity to resistivity using different parameters, such as porosity and water saturation. These types of transforms are currently used to predict background seismic velocities and resistivities, or even start models for seismic or controlled source electromagnetic (CSEM) inversions. However, they are not reliable predictors because they depict the regional elastic or electric variations with limited accuracy. We present a novel approach for the development of models capable of estimating the regional subsurface resistivity based on information from regional wells and seismic inversions. We apply multivariate nonlinear regression on data derived from regional wells and seismic inversions and subsequently produced an estimation of subsurface horizontal resistivity that could be either used as a direct hydrocarbon indicator or provide a constraint on the horizontal resistivity in anisotropic CSEM inversions. We have verified the validity of the approach using two data sets from the Norwegian continental shelf. We found very good agreement between the borehole-measured and predicted resistivity.

scholarly journals A novel approach for accurate prediction of spontaneous passage of ureteral stones: Support vector machines

2006 ◽  
Vol 69 (1) ◽  
pp. 157-160 ◽  
Author(s):  
F. Dal Moro ◽  
A. Abate ◽  
G.R.G. Lanckriet ◽  
G. Arandjelovic ◽  
P. Gasparella ◽  
...  
Keyword(s):  
Support Vector Machines ◽  
Accurate Prediction ◽  
Ureteral Stones ◽  
Support Vector ◽  
Spontaneous Passage ◽  
Novel Approach ◽  
Vector Machines

Sampling rainfall events: a novel approach to generate large correlated samples

2012 ◽  
Vol 44 (2) ◽  
pp. 351-361 ◽  
Author(s):  
Siao Sun ◽  
Soon-Thiam Khu ◽  
Slobodan Djordjević
Keyword(s):  
Computational Efficiency ◽  
Driving Force ◽  
Group Method ◽  
Marginal Distributions ◽  
Rainfall Events ◽  
Trade Off ◽  
Large Group ◽  
Efficient Generation ◽  
Novel Approach ◽  
Novel Method

It is essential that the correlation between variables is considered properly when using sampling-based methods. Modeling rainfall events is of great interest because the rainfall is usually the major driving force of hydrosystems. A novel method for generating correlated samples is introduced providing that the marginal distributions of variables as well as their correlations between them are known. The basic idea of the method is to adjust the correlations between samples by rearranging the positions inside marginal samples after each marginal sample is generated according to its distribution. The group method is developed in order to facilitate an efficient generation of correlated samples of large sizes. The theoretical precision associated with the group method is derived. There is a trade off between the computational efficiency of the algorithm and the precision that can be achieved when using different numbers of groups. The method is successfully applied to two cases of rainfall sample generation problems. The effectiveness of the group method is studied. Large group numbers are recommended in practical use as the samples distribute more broadly regardless of computational efficiency.

scholarly journals Beating the Jetting Regime

2012 ◽  
Vol 13 (5) ◽  
Author(s):  
Alban Sauret ◽  
Ho Cheung Shum
Keyword(s):  
Flow Rate ◽  
Scaling Laws ◽  
Scaling Law ◽  
Good Control ◽  
Theoretical Modelling ◽  
Liquid Jets ◽  
Emulsion Droplets ◽  
Novel Approach ◽  
Break Up ◽  
Good Agreement

AbstractWe study numerically the dynamics of jets and drops in a microcapillary co-flow device. The co-flow stream encounters different flow regimes, including dripping, jetting. Using a level-set/finite element axysimmetric numerical simulation, we study the dynamics of breakup of a jet subject to flow rate perturbations. A scaling law for the width of the unperturbed jet is presented and compared to existing experimental results as well as numerical measurements. Then, we show that the introduction of a sinusoidal perturbation of the inner fluid flow rate can facilitate breakup of the fluid in regimes where a jet is usually observed. Moreover, the flow rate perturbation leads to a good control over the size and the frequency of the resulting droplets. Using theoretical modelling, we provide a criterion to determine the optimal frequency to break up the jet. We also derive scaling laws to determine the volume of inner fluid encapsulated in the emulsion droplets as a function of the frequency and to estimate the distance for the jet to break up as a function of the amplitude of perturbation. These scaling laws are in good agreement with results of numerical simulations. Our work suggests a novel approach and offers guiding principles to break up liquid jets in cases where dripping is difficult to achieve.

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