Publications by authors named "E Gabriela Zea"
Article Synopsis
- Collapsible tubes are used to investigate how sound is produced in the human respiratory system, focusing on airflow characteristics during different collapse states.
- The research aims to connect the sound power generated by the tube to its specific state of collapse using computational fluid dynamics simulations on tested geometries.
- The findings suggest that sound power peaks after the tube structure collapses, paving the way for understanding self-excited oscillations and wheezing in the lungs.
Article Synopsis
- - This research introduces a technique utilizing a residual neural network and a single-layer microphone array to accurately predict sound absorption coefficients for finite porous absorbers, addressing limitations caused by their size.
- - The method involves generating training data through a boundary element model and teaches the network to estimate sound absorption as if the material were infinite, improving predictions across various absorber dimensions and conditions.
- - Results show that this approach performs comparably to the traditional two-microphone method, especially excelling at low frequencies (below 400 Hz) and for smaller absorbers, offering a practical on-site measurement solution despite edge diffraction effects.
This Letter reports evidence suggesting a representation system for transient waves with band limited spectra, referred to here as localized waves in the space-time and wavenumber-frequency domains. A theoretical analysis with a transient monopole shows that the wavenumber-frequency pressure spectrum is distributed over hyperbolic regions of propagating waves and evanescent waves. An experimental analysis is performed, applying dictionary learning to reverberant sound fields measured with a microphone array in three rooms.
View Article and Find Full Text PDFCommon chronic conditions such as metabolic syndrome and diabetes are increasingly associated to metabolic and cardiovascular complications. Although leaves have been used in decoctions as a popular remedy to control blood glucose levels and hypertension, its use needs a scientific basis. This study was therefore undertaken to report a phytochemical analysis of leaves and to test if the main active compound has potential to simultaneously tackle several pathophysiological features of metabolic syndrome and diabetes-related metabolic and vascular disorders such as hyperglycaemia, increased platelet activation, and endothelial dysfunction.
View Article and Find Full Text PDFThis brief communication exposes an overview of various wavenumber filters to separate the rail contribution to pass-by noise via the wave signature extraction method [Zea, Manzari, Squicciarini, Feng, Thompson, and Lopez Arteaga, J. Sound Vib. , 24-42 (2017)].
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