Results 261 to 270 of about 104,311 (309)

Perturbation analysis of an explicit wavefield separation scheme for P- and S-waves

Geophysics, 2002
Abstract Dense spatial recording patterns of three-component (3C) receivers allow for direct wavefield decomposition through explicit calculation of divergence and curl of the recorded elastic wavefield. Since this approach is based upon the observation of small phase shifts, it requires highly accurate deployment of the receiver ...
Muijs, Remco, Holliger, Klaus, Robertsson, Johan O. A.   +2 more
openaire   +2 more sources

Effects of carotid pressure waveforms on the results of wave separation, wave intensity and reservoir pressure analysis

Physiological Measurement, 2018
Abstract Objective : Recently great attention has been paid to innovative cardiovascular biomarkers obtained from wave separation (WS), wave intensity (WI) and reservoir-wave (RW) theories. All these approaches share a requirement for pressure information.
Di Lascio N, Gemignani V, Bianchini E, Bruno RM, Ghiadoni L, Faita F   +5 more
openaire   +2 more sources

Wave Separation and Waveform Analysis

2018
Wave separation is the calculation of forward and reflected pressure and flow waves. The calculation can be performed in the time domain (Chap. 12). Forward pressure and flow waves are similar in shape, and the reflected pressure and flow waves are also similar in shape, but the reflected flow wave is inverted with respect to the reflected pressure ...
Nicolaas Westerhof, Nikolaos Stergiopulos, Mark I. M. Noble, Berend E. Westerhof   +3 more
openaire   +1 more source

Dispersion curve analysis method for Lamb wave mode separation

Structural Health Monitoring, 2019
The Lamb wave inspection has emerged as a promising method for structural health monitoring and nondestructive testing. However, because of the highly dispersive and multimodal features, the Lamb wave mode separation has become a challenging problem.
Yue Hu, Yanping Zhu, Xiaotong Tu, Jing Lu, Fucai Li   +4 more
openaire   +1 more source

Boundary-layer analysis of waves propagating in an excitable medium: Medium conditions for wave-front–obstacle separation

Physical Review E, 1996
In an excitable medium, wave breaks are essential for spiral wave formation. Although wave breaks can result from collisions between a wave and an obstacle, it is only when the resultant wave fragments separate from the obstacle ~wave-front‐obstacle separation! that a spiral wave will begin to develop.
, Starobin, , Starmer
openaire   +2 more sources

Sex Differences in Aortic Hemodynamics Following Acute Exercise: Wave Separation Analysis

International Journal of Sports Medicine, 2018
AbstractThe importance of sex differences in the control of blood pressure responses to exercise is controversial. It is unknown whether the potential sex differences are a result of magnitude differences in forward or reflected pressure waves. The purpose of this study was to investigate sex differences in BP following acute exercise using wave ...
Sang Ouk, Wee, Huimin, Yan, Abbi, Lane-Cordova, Sushant M, Ranadive, Alexander J, Rosenberg, Daniel W, White, Bo, Fernhall   +6 more
openaire   +2 more sources

Arterial pressure pulse wave separation analysis using a multi-Gaussian decomposition model

Physiological Measurement, 2022
Abstract Objective. Methods for separating the forward–backward components from blood pulse waves rely on simultaneously measured pressure and flow velocity from a target artery site. Modelling approaches for flow velocity simplify the wave separation analysis (WSA), providing a methodological ...
Rahul Manoj, Kiran V Raj, P M Nabeel, Mohanasankar Sivaprakasam, Jayaraj Joseph   +4 more
openaire   +2 more sources

Reservoir-wave separation and wave intensity analysis applied to carotid arteries: A hybrid 1D model to understand haemodynamics

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2008
Pressure waveforms measured at different locations in the cardiovascular system present a very similar diastolic decay. Previous work has shown the cardiovascular system can be modelled as a Windkessel and wave system. This concept has been extended to any arbitrary location in the cardiovascular system.
Jazmin, Aguado-Sierra, Justin E, Davies, Nearchos, Hadjiloizou, Darrel, Francis, Jamil, Mayet, Alun D, Hughes, Kim H, Parker   +6 more
openaire   +2 more sources

Arterial Wave Separation Analysis and Reflection Wave Transit Time Estimation using a Double Rayleigh Flow Rate Model

2023 45th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2023
Arterial pulse wave separation analysis (WSA) requires simultaneously measured pressure and flow rate waveform from the same arterial site. Modelling approaches to flow rate waveforms offers a methodological and instrumentational advantage. However, current techniques are limited to the aortic site.
Rahul Manoj, Aneesh S, Raj Kiran V., P. M. Nabeel, Mohanasankar Sivaprakasam, Jayaraj Joseph   +5 more
openaire   +2 more sources

Separation of split shear waves based on a hodogram analysis of HTI media

Acta Geophysica, 2018
Although the shear-wave birefringence phenomenon affects the imaging of converted shear waves, it also provides a considerable amount of information on subsurface fracture development. Therefore, it is significant to separate split shear waves before seismic interpretation and reservoir prediction.
Yuyong Yang, Jun Lu, Yun Wang
openaire   +1 more source