Bibliografias temáticas / Acoustic mode conversion

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Literatura científica selecionada sobre o tema "Acoustic mode conversion"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 1 de fevereiro de 2022

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Artigos de revistas sobre o assunto "Acoustic mode conversion"

PALIES, P., D. DUROX, T. SCHULLER, and S. CANDEL. "Acoustic–convective mode conversion in an aerofoil cascade." Journal of Fluid Mechanics 672 (February 14, 2011): 545–69. http://dx.doi.org/10.1017/s0022112010006142.

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When an acoustic wave impinges on an aerofoil cascade, a convective vorticity mode is generated giving rise to transverse velocity perturbations. This mode conversion process is investigated to explain the flow dynamics observed when swirlers are submitted to incident acoustic disturbances. The phenomenon is first studied in the case of a two-dimensional aerofoil cascade using a model derived from an actuator disk theory. The model is simplified to deal with low-Mach-number flows. The velocity field on the downstream side of the cascade features two components, an axial perturbation associated

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Shivamoggi, Bhimsen K. "Resonant mode conversion of a shear Alfvén wave." Canadian Journal of Physics 65, no. 4 (1987): 357–58. http://dx.doi.org/10.1139/p87-041.

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A new mechanism for the resonant absorption of a shear Alfvén wave is proposed that involves a direct mode conversion of the latter to an ion-acoustic wave without bringing in the intermediary — the kinetic Alfvén wave. The fraction of the incident Alfvén-wave energy that is mode-converted to an ion-acoustic wave is calculated. This mechanism likely operates in the solar wind, where it might lead to heating of the plasma.

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Fernandes, Gil M., Nelson J. Muga, and Armando Nolasco Pinto. "Tunable Mode Conversion Using Acoustic Waves in Optical Microwires." Journal of Lightwave Technology 32, no. 19 (2014): 3257–65. http://dx.doi.org/10.1109/jlt.2014.2330955.

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Chean, Tan Wei, Naohiro Hozumi, Sachiko Yoshida, Kazuto Kobayashi, and Yuki Ogura. "Mutual conversion between B-mode image and acoustic impedance image." Japanese Journal of Applied Physics 56, no. 7S1 (2017): 07JF18. http://dx.doi.org/10.7567/jjap.56.07jf18.

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Bender, F., R. Dahint, and F. Josse. "Acoustic wave-based sensors using mode conversion in periodic gratings." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, no. 6 (1999): 1497–503. http://dx.doi.org/10.1109/58.808873.

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Behme, G., and T. Hesjedal. "Reflection and mode conversion of surface acoustic waves studied by scanning acoustic force microscopy." Applied Physics A Materials Science & Processing 72, no. 4 (2001): 491–93. http://dx.doi.org/10.1007/s003390100803.

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Raboonik, Abbas, and Paul S. Cally. "Benchmarking hall-induced magnetoacoustic to Alfvén mode conversion in the solar chromosphere." Monthly Notices of the Royal Astronomical Society 507, no. 2 (2021): 2671–83. http://dx.doi.org/10.1093/mnras/stab2293.

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ABSTRACT A 2.5D numerical model of magnetoacoustic-Alfvén linear mode conversions in the partially ionized low solar atmosphere induced by the Hall effect is surveyed, varying magnetic field strength and inclination, and wave frequency and horizontal wavenumber. It is found that only the magnetic component of wave energy is subject to Hall-mediated conversions to Alfvén wave-energy via a process of polarization rotation. This strongly boosts direct mode conversion between slow magnetoacoustic and Alfvén waves in the quiet low chromosphere, even at mHz frequencies. However, fast waves there, wh

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Schmitt, M., K. Schmidt, S. Olfert, et al. "Detection of coatings within liquid-filled tubes and containers by mode conversion of leaky Lamb waves." Journal of Sensors and Sensor Systems 2, no. 1 (2013): 73–84. http://dx.doi.org/10.5194/jsss-2-73-2013.

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Abstract. In this paper, a new acoustic sensor principle for coating detection within liquid-filled tubes and containers based on mode conversion of leaky Lamb waves is introduced. Leaky Lamb waves are excited and detected by single-phase transducers, which are attached on the outer side of a tube or container. By transmission time and amplitude measurements, coating formation within the liquid-filled tube and container is detected non-invasively. This new sensor principle is subdivided into the separate considerations of Lamb wave excitation, mode conversion and inverse mode conversion. The L

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Riedl, J. M., T. Van Doorsselaere, and I. C. Santamaria. "Wave modes excited by photospheric p-modes and mode conversion in a multi-loop system." Astronomy & Astrophysics 625 (May 2019): A144. http://dx.doi.org/10.1051/0004-6361/201935393.

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Context. Waves are ubiquitous in the solar corona and there are indications that they are excited by photospheric p-modes. However, it is unclear how p-modes in coronal loops are converted to sausage modes and transverse (kink) modes, which are observed in the corona. Aims. We aim to investigate how those wave modes are excited in the lower corona by photospheric acoustic waves. Methods. We built 3D magnetohydrostatic loop systems with multiple inclinations spanning from the photosphere to the lower corona. We then simulated these atmospheres with the MANCHA code, in which we perturb the equil

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Draeger, Carsten, Didier Cassereau, and Mathias Fink. "Acoustic time reversal with mode conversion at a solid-fluid interface." Applied Physics Letters 72, no. 13 (1998): 1567–69. http://dx.doi.org/10.1063/1.121117.

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Mais fontes

Teses / dissertações sobre o assunto "Acoustic mode conversion"

Parpiiev, Tymur. "Ultrafast magneto-acoustics in magnetostrictive materials." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1044/document.

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Avec l’avènement du laser femtoseconde il est devenu possible de mesurer comment la démagnétisation femtoseconde peut permettre de sonder l’interaction d’échange dans les métaux ferromagnétiques. La démagnétisation induite par laser d’un matériau avec un fort couplage magnéto-élastique amène à la relaxation des contraintes mécaniques, générant ainsi des ondes acoustiques longitudinales (L) et transversales (T). Dans ce travail de thèse, la génération d’impulsions acoustiques picosecondes T par le mécanisme de démagnétostriction dans des matériaux fortement magnétostrictifs est traitée analytiq

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Wilkie-Chancellier, Nicolas. "Réflexion et conversion d'une onde de Lamb à l'extrémité biseautée d'une plaque." Phd thesis, Université du Havre, 2003. http://tel.archives-ouvertes.fr/tel-00006282.

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Ce travail est consacré à l'étude de l'interaction d'ondes de Lamb avec un biseau. L'objectif est d'identifier les différents modes propagatifs issus de la conversion de l'onde incidente sur l'extrémité biseautée d'une plaque et d'évaluer l'énergie transportée par chaque mode. Dans un premier temps, cette étude est réalisée expérimentalement sur une plaque d'acier inoxydable. Les bilans d'énergie sont déduits des mesures des déplacements en surface par interférométrie laser. Ils sont corrigés pour tenir compte de la diffraction des ondes ultrasonores. Un modèle théorique, basé sur une décompos

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Nosjean, Nicolas. "Management et intégration des risques et incertitudes pour le calcul de volumes de roches et de fluides au sein d’un réservoir, zoom sur quelques techniques clés d’exploration Integrated Post-stack Acoustic Inversion Case Study to Enhance Geological Model Description of Upper Ordovicien Statics : from imaging to interpretation pitfalls and an efficient way to overcome them Improving Upper Ordovician reservoir characterization - an Algerian case study Tracking Fracture Corridors in Tight Gas Reservoirs : An Algerian Case Study Integrated sedimentological case study of glacial Ordovician reservoirs in the Illizi Basin, Algeria A Case Study of a New Time-Depth Conversion Workflow Designed for Optimizing Recovery Proper Systemic Knowledge of Reservoir Volume Uncertainties in Depth Conversion Integration of Fault Location Uncertainty in Time to Depth Conversion Emergence of edge scenarios in uncertainty studies for reservoir trap analysis Enhancing geological model with the use of Spectral Decomposition - A case study of a prolific stratigraphic play in North Viking Graben, Norway Fracture corridor identification through 3D multifocusing to improve well deliverability, an Algerian tight reservoir case study Geological Probability Of Success Assessment for Amplitude-Driven Prospects, A Nile Delta Case Study." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS085.

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En tant que géoscientifique dans le domaine de l’Exploration pétrolière et gazière depuis une vingtaine d’années, mes fonctions professionnelles m’ont permis d’effectuer différents travaux de recherche sur la thématique de la gestion des risques et des incertitudes. Ces travaux de recherche se situent sur l’ensemble de la chaîne d’analyse Exploration, traitant de problématiques liées à l’acquisition et au traitement sismique, jusqu’au placement optimal de forages d’exploration. Un volet plus poussé de mes travaux s’est orienté sur la gestion des incertitudes géophysiques en Exploration pétroli

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Chen, Yen-Hua, and 陳彥樺. "A Voice Conversion System Enhanced with Acoustic Language-model, Global Variance Matching, and Target Frame Selection." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/46717789798970858377.

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碩士<br>國立臺灣科技大學<br>資訊工程系<br>104<br>In this thesis, a combination method for voice conversion is proposed to enhance the performance of GMM based voice conversion systems. The combination method includes the processing modules, PPM acoustic language-model (ALM), target frame selection (TFS), and global variance (GV) matching. Actually, we implement the two voice conversion methods: ALM+TFS+GV and ALM+GV+TFS. In training stage, we use the 128 mean vectors of Gaussian mixtures from a trained GMM to establish a quasi-phonetic symbol binary classification tree. Then, the tree is used to train ALM. I

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Tran, Bryant Minh. "Three transdimensional factors for the conversion of 2D acoustic rough surface scattering model results for comparison with 3D scattering." Thesis, 2013. http://hdl.handle.net/2152/23594.

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Rough surface scattering is a problem of interest in underwater acoustic remote sensing applications. To model this problem, a fully three-dimensional (3D) finite element model has been developed, but it requires an abundance of time and computational resources. Two-dimensional (2D) models that are much easier to compute are often employed though they don’t natively represent the physical environment. Three quantities have been developed that, when applied, allow 2D rough surface scattering models to be used to predict 3D scattering. The first factor, referred to as the spreading factor, adopt

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Capítulos de livros sobre o assunto "Acoustic mode conversion"

Wichard, Ralf, and Werner Dietsche. "A New Phonon-Focusing Phenomenon due to Elastic Mode Conversion on Silicon Surfaces." In Acoustical Imaging. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3370-2_16.

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Varlamov, Andrey V., Petr M. Agrusov, Igor V. Il’ichev, Vladimir V. Lebedev, Aleksandr V. Shamrai, and Serguei I. Stepanov. "Temperature Dependence of Acousto-Optic Polarization Mode Conversion Peak Frequency and Efficiency." In Springer Proceedings in Physics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58868-7_34.

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Cai, Zhichao, Zhenyong Zhao, Lan Chen, and Guiyun Tian. "Edge Detection of Metal Thickness of Electromagnetic Acoustic Transducer Based on Super-Heterodyne Phase-Sensitive Detector." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200012.

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In order to improve the thickness measurement accuracy of metal plate, a new method based on phase detection thickness is proposed. Two modes of ultrasonic echo are generated by electromagnetic acoustic transducer (EMAT) at the edge of specimen, and super-heterodyne phase-sensitive detection technique is used to collect the phases of the ultrasonic, then the thickness information of the tested specimen is obtained accurately. Firstly, the finite element model of EMAT is built, and the time-domain characteristics of acoustic echo are analyzed. Secondly, the 0∘ and 90∘ phase detection on echo signal are detected by the super-heterodyne phase-sensitive detection system. Finally, the relationship between phase information and specimen thickness is analyzed. The results show that the detection method, which based on super-heterodyne phase-sensitive detector of edge mode conversion, can realize the detection of metal plate thickness, and the phase error range is controlled within 0.23%.

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Salimbajevs, Askars. "Using Privacy-Transformed Speech in the Automatic Speech Recognition Acoustic Model Training." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2020. http://dx.doi.org/10.3233/faia200601.

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Automatic Speech Recognition (ASR) requires huge amounts of real user speech data to reach state-of-the-art performance. However, speech data conveys sensitive speaker attributes like identity that can be inferred and exploited for malicious purposes. Therefore, there is an interest in the collection of anonymized speech data that is processed by some voice conversion method. In this paper, we evaluate one of the voice conversion methods on Latvian speech data and also investigate if privacy-transformed data can be used to improve ASR acoustic models. Results show the effectiveness of voice conversion against state-of-the-art speaker verification models on Latvian speech and the effectiveness of using privacy-transformed data in ASR training.

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Darģis, Roberts, Normunds Grūzītis, Ilze Auzin̦a, and Kaspars Stepanovs. "Creation of Language Resources for the Development of a Medical Speech Recognition System for Latvian." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2020. http://dx.doi.org/10.3233/faia200615.

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This paper describes an ongoing work on the creation of Latvian language resources for the medical domain focusing on digital imaging to develop a medical speech recognition system for Latvian. The language resources include a pronunciation lexicon, a text corpus for language modelling, and an orthographically transcribed speech corpus for the (i) adaptation of the acoustic model, (ii) evaluation of the speech recognition accuracy, (iii) development and testing of rewrite rules for automatic text conversion to the spoken form and back to the written form. This work is part of a larger industry-driven research project which aims at the development of specific Latvian speech recognition systems for the medical domain.

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Manzo, V. J. "Working with Audio." In Max/MSP/Jitter for Music. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199777679.003.0017.

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In this chapter, we will discuss MSP, a collection of objects that work with audio signals. Unlike the Max objects we’ve discussed so far that handled data like numbers (including MIDI) and text, the MSP objects can handle actual sound recordings, like audio from a microphone, as well as generate signals. As we will see, MSP objects have a ~ after their name and slightly different colored patch cords signifying that they are handling some sort of audio signal. By the end of this chapter, you will be able to get a microphone signal in and out of Max, generate timbre according to the harmonic series, and build your very own synthesizer from that timbre. Let’s begin by building a basic patch that takes input from a microphone and sends it out to your speakers. Your computer is a digital device; you, as I hope you know, are not. Your voice is an acoustic instrument which, in the early days of recording, used to be recorded using analog recording techniques to represent qualities of the acoustic instrument. In order for your voice to be recorded and represented by a computer, there needs to be some conversion of the analog signal to a digital signal. For this reason, your computer’s sound card has an analog to digital converter, otherwise known as an A to D converter or, simply an ADC. Depending on the type of sound card you have, some AD converters will do a better job than others of supplying enough digits to represent the analog sound being recorded. Think about it like this: if you were allowed 50 words to describe your favorite food, the description would be a lot more articulate than if you had only 15 words to describe your favorite food. In the same regard, in a digital recording system, the more digits you have to represent the analog signal you are recording, the closer the representation will be to the original source you can hear with your ears. For now, we will leave this discussion of analog to digital conversion.

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Trabalhos de conferências sobre o assunto "Acoustic mode conversion"

Pijolat, M., D. Mercier, A. Reinhardt, et al. "Mode conversion in high overtone bulk acoustic wave resonators." In 2009 Joint Meeting of the European Frequency and Time Forum (EFTF) and the IEEE International Frequency Control Symposium (FCS). IEEE, 2009. http://dx.doi.org/10.1109/freq.2009.5168188.

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Nurmalia, N. Nakamura, H. Ogi, and M. Hirao. "Mode conversion of torsional waves generated by electromagnetic acoustic transducer." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32. AIP, 2013. http://dx.doi.org/10.1063/1.4789141.

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Wu, K. T., M. Kobayashi, C. K. Jen, and J. F. Moisan. "10D-2 Integrated Plate Acoustic Wave Transducers Using Mode Conversion." In 2007 IEEE Ultrasonics Symposium. IEEE, 2007. http://dx.doi.org/10.1109/ultsym.2007.232.

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ZHANG, Zhen-yu, Chao ZHANG, Hong-li JI, Jin-hao QIU, and Jin-ling ZHAO. "Mode Conversion in Composite Material with Matrix Cracks." In 2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA). IEEE, 2019. http://dx.doi.org/10.1109/spawda48812.2019.9019227.

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Briers and Leroy. "An acoustic mode method for the description of scattering and mode conversion processes." In Proceedings of IEEE Ultrasonics Symposium ULTSYM-94. IEEE, 1994. http://dx.doi.org/10.1109/ultsym.1994.401689.

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Poulton, C. G., I. Aryanfar, C. Wolff, A. Casas-Bedoya, M. J. Steel, and B. J. Eggleton. "Stimulated Brillouin Scattering, hybrid acoustic modes and nonreciprocal mode-conversion in nanophotonic waveguides." In CLEO: QELS_Fundamental Science. OSA, 2014. http://dx.doi.org/10.1364/cleo_qels.2014.fm1d.7.

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Milsom, R. F., H.-P. Lobl, F. Vanhelmont, A. B. M. Jansman, J.-W. Lobeek, and A. Tuinhout. "Comparison of Mode-Conversion, Energy-Trapping and Lateral Acoustic Coupling in FBAR and SBAR." In 2005 IEEE MTT-S International Microwave Symposium. IEEE, 2005. http://dx.doi.org/10.1109/mtt67880.2005.9387848.

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Song, Zhen-hua, Feng Liu, and Hong-wei Ma. "Experimental study of mode conversion in pipes on damage detection by using longitudinal ultrasonic guided." In 2010 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA 2010). IEEE, 2010. http://dx.doi.org/10.1109/spawda.2010.5744265.

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Wang, Leping, Ryo Umeoka, and Akira Chiba. "Investigation of Mode 0 Acoustic Noise Reduction of Interior Permanent Magnet Motor with a Principle of Radial Force Sum Flattening." In 2020 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2020. http://dx.doi.org/10.1109/ecce44975.2020.9235658.

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Lindner, G., H. Faustmann, S. Frankenberger, et al. "5K-5 A Versatile Acoustic Waveguide Sensor for Liquids Based on Multiple Mode Conversion at Solid-Liquid Interfaces." In 2006 IEEE Ultrasonics Symposium. IEEE, 2006. http://dx.doi.org/10.1109/ultsym.2006.303.

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