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class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 7408</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: acoustic materials</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7408</span> Acoustic Performance and Application of Three Personalized Sound-Absorbing Materials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fangying%20Wang">Fangying Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhang%20Sanming"> Zhang Sanming</a>, <a href="https://publications.waset.org/abstracts/search?q=Ni%20Qian"> Ni Qian</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In recent years, more and more personalized sound absorbing materials have entered the Chinese room acoustical decoration market. The acoustic performance of three kinds of personalized sound-absorbing materials: Flame-retardant Flax Fiber Sound-absorbing Cotton, Eco-Friendly Sand Acoustic Panel and Transparent Micro-perforated Panel (Film) are tested by Reverberation Room Method. The sound absorption characteristic curves show that their performance match for or even exceed the traditional sound absorbing material. Through the application in the actual projects, these personalized sound-absorbing materials also proved their sound absorption ability and unique decorative effect. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20performance" title="acoustic performance">acoustic performance</a>, <a href="https://publications.waset.org/abstracts/search?q=application%20prospect%20personalized%20sound-absorbing%20materials" title=" application prospect personalized sound-absorbing materials"> application prospect personalized sound-absorbing materials</a> </p> <a href="https://publications.waset.org/abstracts/88980/acoustic-performance-and-application-of-three-personalized-sound-absorbing-materials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/88980.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">194</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7407</span> Development of Low-Cost Vibro-Acoustic, and Fire-Resistant, Insulation Material from Natural and Sustainable Sources</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=K.%20Nasir">K. Nasir</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Ahmad"> S. Ahmad</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Khan"> A. Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Benkreira"> H. Benkreira</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The topic of the research is to develop sustainable fire-resistant materials for vibration and acoustic damping of structure and airborne noises from sustainable recycled materials and biodegradable binders. The paper reports, methods and techniques of enhancing fire resistive, vibration and acoustic properties of building insulation materials made from natural resources like wood and recycled materials like rubber and textile waste. The structures are designed to optimize the number, size and stratification of closed (heat insulating) and open (noise insulating) pores. The samples produced are tested for their heat and noise insulating properties, including vibration damping and their structural properties (airflow resistivity, porosity, tortuosity and elastic modulus). The structural properties are then used in theoretical models to check the acoustic insulation measurements. Initial data indicate that one layer of such material can yield as much as 18 times more damping, increasing the loss factor by 18%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fire%20resistant" title="fire resistant">fire resistant</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20damping" title=" vibration damping"> vibration damping</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20material" title=" acoustic material"> acoustic material</a>, <a href="https://publications.waset.org/abstracts/search?q=vibro-acoustic" title=" vibro-acoustic"> vibro-acoustic</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20insulation" title=" thermal insulation"> thermal insulation</a>, <a href="https://publications.waset.org/abstracts/search?q=sustainable%20material" title=" sustainable material"> sustainable material</a>, <a href="https://publications.waset.org/abstracts/search?q=low%20cost%20materials" title=" low cost materials"> low cost materials</a>, <a href="https://publications.waset.org/abstracts/search?q=recycled%20materials" title=" recycled materials"> recycled materials</a>, <a href="https://publications.waset.org/abstracts/search?q=construction%20material" title=" construction material"> construction material</a> </p> <a href="https://publications.waset.org/abstracts/106069/development-of-low-cost-vibro-acoustic-and-fire-resistant-insulation-material-from-natural-and-sustainable-sources" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/106069.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">139</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7406</span> Using Probabilistic Neural Network (PNN) for Extracting Acoustic Microwaves (Bulk Acoustic Waves) in Piezoelectric Material</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hafdaoui%20Hichem">Hafdaoui Hichem</a>, <a href="https://publications.waset.org/abstracts/search?q=Mehadjebia%20Cherifa"> Mehadjebia Cherifa</a>, <a href="https://publications.waset.org/abstracts/search?q=Benatia%20Djamel"> Benatia Djamel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we propose a new method for Bulk detection of an acoustic microwave signal during the propagation of acoustic microwaves in a piezoelectric substrate (Lithium Niobate LiNbO3). We have used the classification by probabilistic neural network (PNN) as a means of numerical analysis in which we classify all the values of the real part and the imaginary part of the coefficient attenuation with the acoustic velocity in order to build a model from which we note the Bulk waves easily. These singularities inform us of presence of Bulk waves in piezoelectric materials. By which we obtain accurate values for each of the coefficient attenuation and acoustic velocity for Bulk waves. This study will be very interesting in modeling and realization of acoustic microwaves devices (ultrasound) based on the propagation of acoustic microwaves. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=piezoelectric%20material" title="piezoelectric material">piezoelectric material</a>, <a href="https://publications.waset.org/abstracts/search?q=probabilistic%20neural%20network%20%28PNN%29" title=" probabilistic neural network (PNN)"> probabilistic neural network (PNN)</a>, <a href="https://publications.waset.org/abstracts/search?q=classification" title=" classification"> classification</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20microwaves" title=" acoustic microwaves"> acoustic microwaves</a>, <a href="https://publications.waset.org/abstracts/search?q=bulk%20waves" title=" bulk waves"> bulk waves</a>, <a href="https://publications.waset.org/abstracts/search?q=the%20attenuation%20coefficient" title=" the attenuation coefficient"> the attenuation coefficient</a> </p> <a href="https://publications.waset.org/abstracts/43264/using-probabilistic-neural-network-pnn-for-extracting-acoustic-microwaves-bulk-acoustic-waves-in-piezoelectric-material" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43264.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">438</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7405</span> Regularities of Changes in the Fractal Dimension of Acoustic Emission Signals in the Stages Close to the Destruction of Structural Materials When Exposed to Low-Cycle Loaded</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Phyo%20Wai%20Aung">Phyo Wai Aung</a>, <a href="https://publications.waset.org/abstracts/search?q=Sysoev%20Oleg%20Evgenevich"> Sysoev Oleg Evgenevich</a>, <a href="https://publications.waset.org/abstracts/search?q=Boris%20Necolavet%20Maryin"> Boris Necolavet Maryin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The article deals with theoretical problems of correlation of processes of microstructure changes of structural materials under cyclic loading and acoustic emission. The ways of the evolution of a microstructure under the influence of cyclic loading are shown depending on the structure of the initial crystal structure of the material. The spectra of the frequency characteristics of acoustic emission signals are experimentally obtained when testing titanium samples for cyclic loads. Changes in the fractal dimension of the acoustic emission signals in the selected frequency bands during the evolution of the microstructure of structural materials from the action of cyclic loads, as well as in the destruction of samples, are studied. The experimental samples were made of VT-20 structural material widely used in aircraft and rocket engineering. The article shows the striving of structural materials for synergistic stability and reduction of the fractal dimension of acoustic emission signals, in accordance with the degradation of the microstructure, which occurs as a result of fatigue processes from the action of low cycle loads. As a result of the research, the frequency range of acoustic emission signals of 100-270 kHz is determined, in which the fractal dimension of the signals, it is possible to most reliably predict the durability of structural materials. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cyclic%20loadings" title="cyclic loadings">cyclic loadings</a>, <a href="https://publications.waset.org/abstracts/search?q=material%20structure%20changing" title=" material structure changing"> material structure changing</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission" title=" acoustic emission"> acoustic emission</a>, <a href="https://publications.waset.org/abstracts/search?q=fractal%20dimension" title=" fractal dimension"> fractal dimension</a> </p> <a href="https://publications.waset.org/abstracts/90632/regularities-of-changes-in-the-fractal-dimension-of-acoustic-emission-signals-in-the-stages-close-to-the-destruction-of-structural-materials-when-exposed-to-low-cycle-loaded" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90632.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">266</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7404</span> The Condition Testing of Damaged Plates Using Acoustic Features and Machine Learning</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kyle%20Saltmarsh">Kyle Saltmarsh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Acoustic testing possesses many benefits due to its non-destructive nature and practicality. There hence exists many scenarios in which using acoustic testing for condition testing shows powerful feasibility. A wealth of information is contained within the acoustic and vibration characteristics of structures, allowing the development meaningful features for the classification of their respective condition. In this paper, methods, results, and discussions are presented on the use of non-destructive acoustic testing coupled with acoustic feature extraction and machine learning techniques for the condition testing of manufactured circular steel plates subjected to varied levels of damage. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=plates" title="plates">plates</a>, <a href="https://publications.waset.org/abstracts/search?q=deformation" title=" deformation"> deformation</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20features" title=" acoustic features"> acoustic features</a>, <a href="https://publications.waset.org/abstracts/search?q=machine%20learning" title=" machine learning"> machine learning</a> </p> <a href="https://publications.waset.org/abstracts/76911/the-condition-testing-of-damaged-plates-using-acoustic-features-and-machine-learning" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/76911.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">340</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7403</span> Acoustic and Thermal Insulating Materials Based on Natural Fibres Used in Floor Construction</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jitka%20Hroudova">Jitka Hroudova</a>, <a href="https://publications.waset.org/abstracts/search?q=Jiri%20Zach"> Jiri Zach</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The majority of contemporary insulation materials commonly used in the building industry is made from non-renewable raw materials; furthermore, their production often brings high energy costs. A long-term trend as far as sustainable development is concerned has been the reduction of energy and material demands of building material production. One of the solutions is the possibility of using easily renewable natural raw material sources which are considerably more ecological and their production is mostly less energy-consuming compared to the production of normal insulations (mineral wool, polystyrene). The paper describes the results of research focused on the development of thermal and acoustic insulation materials based on natural fibres intended for floor constructions. Given the characteristic open porosity of natural fibre materials, the hygrothermal behaviour of the developed materials was studied. Especially the influence of relative humidity and temperature on thermal insulation properties was observed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Green%20thermal%20and%20acoustic%20insulating%20materials" title="Green thermal and acoustic insulating materials">Green thermal and acoustic insulating materials</a>, <a href="https://publications.waset.org/abstracts/search?q=natural%20fibres" title=" natural fibres"> natural fibres</a>, <a href="https://publications.waset.org/abstracts/search?q=technical%20hemp" title=" technical hemp"> technical hemp</a>, <a href="https://publications.waset.org/abstracts/search?q=flax" title=" flax"> flax</a>, <a href="https://publications.waset.org/abstracts/search?q=floor%20construction" title=" floor construction"> floor construction</a> </p> <a href="https://publications.waset.org/abstracts/15542/acoustic-and-thermal-insulating-materials-based-on-natural-fibres-used-in-floor-construction" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15542.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">341</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7402</span> Effects of Charge Fluctuating Positive Dust on Linear Dust-Acoustic Waves </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sanjit%20Kumar%20Paul">Sanjit Kumar Paul</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20A.%20Mamun"> A. A. Mamun</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20R.%20Amin"> M. R. Amin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Linear propagation of the dust-acoustic wave in a dusty plasma consisting of Boltzmann distributed electrons and ions and mobile charge fluctuating positive dust grains has been investigated by employing the reductive perturbation method. It has been shown that the dust charge fluctuation is a source of dissipation and its responsible for the formation of the dust-acoustic waves in such a dusty plasma. The basic features of such dust-acoustic waves have been identified. It has been proposed to design a new laboratory experiment which will be able to identify the basic features of the dust-acoustic waves predicted in this theoretical investigation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dust%20acoustic%20waves" title="dust acoustic waves">dust acoustic waves</a>, <a href="https://publications.waset.org/abstracts/search?q=dusty%20plasma" title=" dusty plasma"> dusty plasma</a>, <a href="https://publications.waset.org/abstracts/search?q=Boltzmann%20distributed%20electrons" title=" Boltzmann distributed electrons"> Boltzmann distributed electrons</a>, <a href="https://publications.waset.org/abstracts/search?q=charge%20fluctuation" title=" charge fluctuation"> charge fluctuation</a> </p> <a href="https://publications.waset.org/abstracts/8380/effects-of-charge-fluctuating-positive-dust-on-linear-dust-acoustic-waves" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/8380.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">645</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7401</span> ReS, Resonant String Shell: Development of an Acoustic Shell for Outdoor Chamber Music Concerts</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Serafino%20Di%20Rosario">Serafino Di Rosario</a> </p> <p class="card-text"><strong>Abstract:</strong></p> ReS is a sustainable hand-built temporary acoustic shell, developed since 2011 and built during the architectural workshop at Villa Pennisi in Musica in Acireale, Sicily, each year since 2012. The design concept aims to provide a portable structure by reducing the on-site construction problems and the skills required by the builders together with maximizing the acoustic performance for the audience and the musicians. The shell is built using only wood, recycled for the most part, and can be built and dismantled by non-specialized workers in just three days. This paper describes the research process, which spans over four years and presents the final results in form of acoustic simulations performed by acoustic modeling software and real world measurements. ReS is developed by the ReS team who has been presented with the Peter Lord Award in 2015 by the Institute of Acoustics in the UK. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20shell" title="acoustic shell">acoustic shell</a>, <a href="https://publications.waset.org/abstracts/search?q=outdoor%20natural%20amplification" title=" outdoor natural amplification"> outdoor natural amplification</a>, <a href="https://publications.waset.org/abstracts/search?q=computational%20design" title=" computational design"> computational design</a>, <a href="https://publications.waset.org/abstracts/search?q=room%20acoustics" title=" room acoustics"> room acoustics</a> </p> <a href="https://publications.waset.org/abstracts/67117/res-resonant-string-shell-development-of-an-acoustic-shell-for-outdoor-chamber-music-concerts" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67117.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">233</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7400</span> Analytical Solutions for Geodesic Acoustic Eigenmodes in Tokamak Plasmas</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Victor%20I.%20Ilgisonis">Victor I. Ilgisonis</a>, <a href="https://publications.waset.org/abstracts/search?q=Ludmila%20V.%20Konovaltseva"> Ludmila V. Konovaltseva</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20P.%20Lakhin"> Vladimir P. Lakhin</a>, <a href="https://publications.waset.org/abstracts/search?q=Ekaterina%20A.%20Sorokina"> Ekaterina A. Sorokina</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The analytical solutions for geodesic acoustic eigenmodes in tokamak plasmas with circular concentric magnetic surfaces are found. In the frame of ideal magnetohydrodynamics the dispersion relation taking into account the toroidal coupling between electrostatic perturbations and electromagnetic perturbations with poloidal mode number |m| = 2 is derived. In the absence of such a coupling the dispersion relation gives the standard continuous spectrum of geodesic acoustic modes. The analysis of the existence of global eigenmodes for plasma equilibria with both off-axis and on-axis maximum of the local geodesic acoustic frequency is performed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=tokamak" title="tokamak">tokamak</a>, <a href="https://publications.waset.org/abstracts/search?q=MHD" title=" MHD"> MHD</a>, <a href="https://publications.waset.org/abstracts/search?q=geodesic%20acoustic%20mode" title=" geodesic acoustic mode"> geodesic acoustic mode</a>, <a href="https://publications.waset.org/abstracts/search?q=eigenmode" title=" eigenmode"> eigenmode</a> </p> <a href="https://publications.waset.org/abstracts/11335/analytical-solutions-for-geodesic-acoustic-eigenmodes-in-tokamak-plasmas" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11335.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">739</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7399</span> Acoustic Emission for Investigation of Processes Occurring at Hydrogenation of Metallic Titanium</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Anatoly%20A.%20Kuznetsov">Anatoly A. Kuznetsov</a>, <a href="https://publications.waset.org/abstracts/search?q=Pavel%20G.%20Berezhko"> Pavel G. Berezhko</a>, <a href="https://publications.waset.org/abstracts/search?q=Sergey%20M.%20Kunavin"> Sergey M. Kunavin</a>, <a href="https://publications.waset.org/abstracts/search?q=Eugeny%20V.%20Zhilkin"> Eugeny V. Zhilkin</a>, <a href="https://publications.waset.org/abstracts/search?q=Maxim%20V.%20Tsarev"> Maxim V. Tsarev</a>, <a href="https://publications.waset.org/abstracts/search?q=Vyacheslav%20V.%20Yaroshenko"> Vyacheslav V. Yaroshenko</a>, <a href="https://publications.waset.org/abstracts/search?q=Valery%20V.%20Mokrushin"> Valery V. Mokrushin</a>, <a href="https://publications.waset.org/abstracts/search?q=Olga%20Y.%20Yunchina"> Olga Y. Yunchina</a>, <a href="https://publications.waset.org/abstracts/search?q=Sergey%20A.%20Mityashin"> Sergey A. Mityashin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The acoustic emission is caused by short-time propagation of elastic waves that are generated as a result of quick energy release from sources localized inside some material. In particular, the acoustic emission phenomenon lies in the generation of acoustic waves resulted from the reconstruction of material internal structures. This phenomenon is observed at various physicochemical transformations, in particular, at those accompanying hydrogenation processes of metals or intermetallic compounds that make it possible to study parameters of these transformations through recording and analyzing the acoustic signals. It has been known that at the interaction between metals or inter metallides with hydrogen the most intensive acoustic signals are generated as a result of cracking or crumbling of an initial compact powder sample as a result of the change of material crystal structure under hydrogenation. This work is dedicated to the study into changes occurring in metallic titanium samples at their interaction with hydrogen and followed by acoustic emission signals. In this work the subjects for investigation were specimens of metallic titanium in two various initial forms: titanium sponge and fine titanium powder made of this sponge. The kinetic of the interaction of these materials with hydrogen, the acoustic emission signals accompanying hydrogenation processes and the structure of the materials before and after hydrogenation were investigated. It was determined that in both cases interaction of metallic titanium and hydrogen is followed by acoustic emission signals of high amplitude generated on reaching some certain value of the atomic ratio [H]/[Ti] in a solid phase because of metal cracking at a macrolevel. The typical sizes of the cracks are comparable with particle sizes of hydrogenated specimens. The reasons for cracking are internal stresses initiated in a sample due to the increasing volume of a solid phase as a result of changes in a material crystal lattice under hydrogenation. When the titanium powder is used, the atomic ratio [H]/[Ti] in a solid phase corresponding to the maximum amplitude of an acoustic emission signal are, as a rule, higher than when titanium sponge is used. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission%20signal" title="acoustic emission signal">acoustic emission signal</a>, <a href="https://publications.waset.org/abstracts/search?q=cracking" title=" cracking"> cracking</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogenation" title=" hydrogenation"> hydrogenation</a>, <a href="https://publications.waset.org/abstracts/search?q=titanium%20specimen" title=" titanium specimen"> titanium specimen</a> </p> <a href="https://publications.waset.org/abstracts/62156/acoustic-emission-for-investigation-of-processes-occurring-at-hydrogenation-of-metallic-titanium" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62156.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">392</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7398</span> Acoustic and Thermal Isolation Performance Comparison between Recycled and Ceramic Roof Tiles Using Digital Holographic Interferometry</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Araceli%20S%C3%A1nchez">A. Araceli Sánchez</a>, <a href="https://publications.waset.org/abstracts/search?q=I.%20Manuel%20H.%20De%20la%20Torre"> I. Manuel H. De la Torre</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Fernando%20Mendoza"> S. Fernando Mendoza</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Cesar%20Tavera"> R. Cesar Tavera</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Manuel%20de%20J.%20Briones"> R. Manuel de J. Briones</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Recycling, as part of any sustainable environment, is continuously evolving and impacting on new materials in manufacturing. One example of this is the recycled solid waste of Tetra Pak ™ packaging, which is a highly pollutant waste as it is not biodegradable since it is manufactured with different materials. The Tetra Pak ™ container consists of thermally joined layers of paper, aluminum and polyethylene. Once disposed, this packaging is recycled by completely separating the paperboard from the rest of the materials. The aluminum and the polyethylene remain together and are used to create the poly-aluminum, which is widely used to manufacture roof tiles. These recycled tiles have different thermal and acoustic properties compared with traditional manufactured ceramic and cement tiles. In this work, we compare a group of tiles using nondestructive optical testing to measure the superficial micro deformations of the tiles under well controlled experiments. The results of the acoustic and thermal tests show remarkable differences between the recycled tile and the traditional ones. These results help to determine which tile could be better suited to the specific environmental conditions in countries where extreme climates, ranging from tropical, desert-like, to very cold are experienced throughout the year. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic" title="acoustic">acoustic</a>, <a href="https://publications.waset.org/abstracts/search?q=digital%20holographic%20interferometry" title=" digital holographic interferometry"> digital holographic interferometry</a>, <a href="https://publications.waset.org/abstracts/search?q=isolation" title=" isolation"> isolation</a>, <a href="https://publications.waset.org/abstracts/search?q=recycled" title=" recycled"> recycled</a>, <a href="https://publications.waset.org/abstracts/search?q=roof%20tiles" title=" roof tiles"> roof tiles</a>, <a href="https://publications.waset.org/abstracts/search?q=sustainable" title=" sustainable"> sustainable</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal" title=" thermal"> thermal</a> </p> <a href="https://publications.waset.org/abstracts/38387/acoustic-and-thermal-isolation-performance-comparison-between-recycled-and-ceramic-roof-tiles-using-digital-holographic-interferometry" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/38387.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">469</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7397</span> Test Research on Damage Initiation and Development of a Concrete Beam Using Acoustic Emission Technology</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Xiang%20Wang">Xiang Wang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to validate the efficiency of recognizing the damage initiation and development of a concrete beam using acoustic emission technology, a concrete beam is built and tested in the laboratory. The acoustic emission signals are analyzed based on both parameter and wave information, which is also compared with the beam deflection measured by displacement sensors. The results indicate that using acoustic emission technology can detect damage initiation and development effectively, especially in the early stage of the damage development, which can not be detected by the common monitoring technology. Furthermore, the positioning of the damage based on the acoustic emission signals can be proved to be reasonable. This job can be an important attempt for the future long-time monitoring of the real concrete structure. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission%20technology" title="acoustic emission technology">acoustic emission technology</a>, <a href="https://publications.waset.org/abstracts/search?q=concrete%20beam" title=" concrete beam"> concrete beam</a>, <a href="https://publications.waset.org/abstracts/search?q=parameter%20analysis" title=" parameter analysis"> parameter analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=wave%20analysis" title=" wave analysis"> wave analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=positioning" title=" positioning"> positioning</a> </p> <a href="https://publications.waset.org/abstracts/108497/test-research-on-damage-initiation-and-development-of-a-concrete-beam-using-acoustic-emission-technology" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108497.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">145</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7396</span> Acoustic Absorption of Hemp Walls with Ground Granulated Blast Slag</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Oliver%20Kinnane">Oliver Kinnane</a>, <a href="https://publications.waset.org/abstracts/search?q=Aidan%20Reilly"> Aidan Reilly</a>, <a href="https://publications.waset.org/abstracts/search?q=John%20Grimes"> John Grimes</a>, <a href="https://publications.waset.org/abstracts/search?q=Sara%20Pavia"> Sara Pavia</a>, <a href="https://publications.waset.org/abstracts/search?q=Rosanne%20Walker"> Rosanne Walker</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Unwanted sound reflection can create acoustic discomfort and lead to problems of speech comprehensibility. Contemporary building techniques enable highly finished internal walls resulting in sound reflective surfaces. In contrast, sustainable construction materials using natural and vegetal materials, are often more porous and absorptive. Hemp shiv is used as an aggregate and when mixed with lime binder creates a low-embodied-energy concrete. Cement replacements such as ground granulated blast slag (GGBS), a byproduct of other industrial processes, are viewed as more sustainable alternatives to high-embodied-energy cement. Hemp concretes exhibit good hygrothermal performance. This has focused much research attention on them as natural and sustainable low-energy alternatives to standard concretes. A less explored benefit is the acoustic absorption capability of hemp-based concretes. This work investigates hemp-lime-GGBS concrete specifically, and shows that it exhibits high levels of sound absorption. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hemp" title="hemp">hemp</a>, <a href="https://publications.waset.org/abstracts/search?q=hempcrete" title=" hempcrete"> hempcrete</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20absorption" title=" acoustic absorption"> acoustic absorption</a>, <a href="https://publications.waset.org/abstracts/search?q=GGBS" title=" GGBS"> GGBS</a> </p> <a href="https://publications.waset.org/abstracts/49146/acoustic-absorption-of-hemp-walls-with-ground-granulated-blast-slag" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/49146.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">409</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7395</span> Damage Analysis in Open Hole Composite Specimens by Acoustic Emission: Experimental Investigation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Youcef%20Faci">Youcef Faci</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Mebtouche"> Ahmed Mebtouche</a>, <a href="https://publications.waset.org/abstracts/search?q=Badredine%20Maalem"> Badredine Maalem</a> </p> <p class="card-text"><strong>Abstract:</strong></p> n the present work, an experimental study is carried out using acoustic emission and DIC techniques to analyze the damage of open hole woven composite carbon/epoxy under solicitations. Damage mechanisms were identified based on acoustic emission parameters such as amplitude, energy, and cumulative account. The findings of the AE measurement were successfully identified by digital image correlation (DIC) measurements. The evolution value of bolt angle inclination during tensile tests was studied and analyzed. Consequently, the relationship between the bolt inclination angles during tensile tests associated with failure modes of fastened joints of composite materials is determined. Moreover, there is an interaction between laminate pattern, laminate thickness, fastener size and type, surface strain concentrations, and out-of-plane displacement. Conclusions are supported by microscopic visualizations of the composite specimen. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=tensile%20test" title="tensile test">tensile test</a>, <a href="https://publications.waset.org/abstracts/search?q=damage" title=" damage"> damage</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission" title=" acoustic emission"> acoustic emission</a>, <a href="https://publications.waset.org/abstracts/search?q=digital%20image%20correlation" title=" digital image correlation"> digital image correlation</a> </p> <a href="https://publications.waset.org/abstracts/170900/damage-analysis-in-open-hole-composite-specimens-by-acoustic-emission-experimental-investigation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/170900.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">77</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7394</span> Design of an Acoustic System for Small-Scale Power Plants</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammadreza%20Judaki">Mohammadreza Judaki</a>, <a href="https://publications.waset.org/abstracts/search?q=Hosein%20Mohammadnezhad%20Shourkaei"> Hosein Mohammadnezhad Shourkaei</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Usually, noise generated by industrial units, is a pollution and disturbs people and causes problems for human health and sometimes these units will be closed because they cannot eliminate this pollution. Small-scale power plants usually are built close to residential areas, and noise generated by these power plants is an important factor in choosing their location and their design. Materials used to reduce noise are studied by measuring their absorption and reflection index numerically and experimentally. We can use MIKI model (Yasushi Miki, 1990) to simulate absorption index by using software like Ansys or Soundflow and compare calculation results with experimental simulation data. We consider high frequency sounds of power plant engines octave band diagram because dB value of high frequency noise is more noticeable for human ears. To prove this, in this study we first will study calculating octave band of engines exhausts and then we will study acoustic behavior of materials that we will use in high frequencies and this will give us our optimum noise reduction plan. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20materials" title="acoustic materials">acoustic materials</a>, <a href="https://publications.waset.org/abstracts/search?q=eliminating%20engine%20noise" title=" eliminating engine noise"> eliminating engine noise</a>, <a href="https://publications.waset.org/abstracts/search?q=octave%20level%20diagram" title=" octave level diagram"> octave level diagram</a>, <a href="https://publications.waset.org/abstracts/search?q=power%20plant%20noise" title=" power plant noise"> power plant noise</a> </p> <a href="https://publications.waset.org/abstracts/93255/design-of-an-acoustic-system-for-small-scale-power-plants" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/93255.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">148</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7393</span> Desing of Woven Fabric with Increased Sound Transmission Loss Property</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=U.%20Gunal">U. Gunal</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20I.%20Turgut"> H. I. Turgut</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Gurler"> H. Gurler</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Kaya"> S. Kaya</a> </p> <p class="card-text"><strong>Abstract:</strong></p> There are many ever-increasing and newly emerging problems with rapid population growth in the world. With the increase in people's quality of life in our daily life, acoustic comfort has become an important feature in the textile industry. In order to meet all these expectations in people's comfort areas and survive in challenging competitive conditions in the market without compromising the customer product quality expectations of textile manufacturers, it has become a necessity to bring functionality to the products. It is inevitable to research and develop materials and processes that will bring these functionalities to textile products. The noise we encounter almost everywhere in our daily life, in the street, at home and work, is one of the problems which textile industry is working on. It brings with it many health problems, both mentally and physically. Therefore, noise control studies become more of an issue. Besides, materials used in noise control are not sufficient to reduce the effect of the noise level. The fabrics used in acoustic studies in the textile industry do not show sufficient performance according to their weight and high cost. Thus, acoustic textile products can not be used in daily life. In the thesis study, the attributions used in the noise control and building acoustics studies in the literature were analyzed, and the product with the highest damping value that a textile material will have was designed, manufactured, and tested. Optimum values were obtained by using different material samples that may affect the performance of the acoustic material. Acoustic measurement methods should be applied to verify the acoustic performances shown by the parameters and the designed three-dimensional structure at different values. In the measurements made in the study, the device designed for determining the acoustic performance of the material for both the impedance tube according to the relevant standards and the different noise types in the study was used. In addition, sound records of noise types encountered in daily life are taken and applied to the acoustic absorbent fabric with the aid of the device, and the feasibility of the results and the commercial ability of the product are examined. MATLAB numerical computing programming language and libraries were used in the frequency and sound power analyses made in the study. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic" title="acoustic">acoustic</a>, <a href="https://publications.waset.org/abstracts/search?q=egg%20crate" title=" egg crate"> egg crate</a>, <a href="https://publications.waset.org/abstracts/search?q=fabric" title=" fabric"> fabric</a>, <a href="https://publications.waset.org/abstracts/search?q=textile" title=" textile"> textile</a> </p> <a href="https://publications.waset.org/abstracts/124931/desing-of-woven-fabric-with-increased-sound-transmission-loss-property" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/124931.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">111</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7392</span> Sound Performance of a Composite Acoustic Coating With Embedded Parallel Plates Under Hydrostatic Pressure</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bo%20Hu">Bo Hu</a>, <a href="https://publications.waset.org/abstracts/search?q=Shibo%20Wang"> Shibo Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=Haoyang%20Zhang"> Haoyang Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Jie%20Shi"> Jie Shi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> With the development of sonar detection technology, the acoustic stealth technology of underwater vehicles is facing severe challenges. The underwater acoustic coating is developing towards the direction of low-frequency absorption capability and broad absorption frequency bandwidth. In this paper, an acoustic model of underwater acoustic coating of composite material embedded with periodical steel structure is presented. The model has multiple high absorption peaks in the frequency range of 1kHz-8kHz, where achieves high sound absorption and broad bandwidth performance. It is found that the frequencies of the absorption peaks are related to the classic half-wavelength transmission principle. The sound absorption performance of the acoustic model is investigated by the finite element method using COMSOL software. The sound absorption mechanism of the proposed model is explained by the distributions of the displacement vector field. The influence of geometric parameters of periodical steel structure, including thickness and distance, on the sound absorption ability of the proposed model are further discussed. The acoustic model proposed in this study provides an idea for the design of underwater low-frequency broadband acoustic coating, and the results shows the possibility and feasibility for practical underwater application. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20coating" title="acoustic coating">acoustic coating</a>, <a href="https://publications.waset.org/abstracts/search?q=composite%20material" title=" composite material"> composite material</a>, <a href="https://publications.waset.org/abstracts/search?q=broad%20frequency%20bandwidth" title=" broad frequency bandwidth"> broad frequency bandwidth</a>, <a href="https://publications.waset.org/abstracts/search?q=sound%20absorption%20performance" title=" sound absorption performance"> sound absorption performance</a> </p> <a href="https://publications.waset.org/abstracts/167774/sound-performance-of-a-composite-acoustic-coating-with-embedded-parallel-plates-under-hydrostatic-pressure" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167774.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">179</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7391</span> Personal Perception of the Acoustic Properties of Three Different Rooms for Music Lessons</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Natalia%20Ivanova">Natalia Ivanova</a>, <a href="https://publications.waset.org/abstracts/search?q=Konstantin%20Adamov"> Konstantin Adamov</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The importance of acoustics in music classes made us analyse three music rooms in a Bulgarian school. The same music piece was performed in every one of the classrooms. The recording was played to 2 groups of students. A survey was then taken among those students in order to determine their personal preferences and impressions of the acoustic. The results show differences in the preferences of older students compared to younger ones. Results of the survey show a correlation between older students’ preferences and the standard requirements. However, we discover that younger students’ classrooms should be further analysed and adapted to their needs and preferences. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acousic" title="acousic">acousic</a>, <a href="https://publications.waset.org/abstracts/search?q=building%20acoustic" title=" building acoustic"> building acoustic</a>, <a href="https://publications.waset.org/abstracts/search?q=sound%20quality" title=" sound quality"> sound quality</a>, <a href="https://publications.waset.org/abstracts/search?q=scool%20acoustic" title=" scool acoustic"> scool acoustic</a> </p> <a href="https://publications.waset.org/abstracts/157391/personal-perception-of-the-acoustic-properties-of-three-different-rooms-for-music-lessons" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/157391.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">109</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7390</span> Acoustic Modeling of a Data Center with a Hot Aisle Containment System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Arshad%20Alfoqaha">Arshad Alfoqaha</a>, <a href="https://publications.waset.org/abstracts/search?q=Seth%20Bard"> Seth Bard</a>, <a href="https://publications.waset.org/abstracts/search?q=Dustin%20Demetriou"> Dustin Demetriou</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A new multi-physics acoustic modeling approach using ANSYS Mechanical FEA and FLUENT CFD methods is developed for modeling servers mounted to racks, such as IBM Z and IBM Power Systems, in data centers. This new approach allows users to determine the thermal and acoustic conditions that people are exposed to within the data center. The sound pressure level (SPL) exposure for a human working inside a hot aisle containment system inside the data center is studied. The SPL is analyzed at the noise source, at the human body, on the rack walls, on the containment walls, and on the ceiling and flooring plenum walls. In the acoustic CFD simulation, it is assumed that a four-inch diameter sphere with monopole acoustic radiation, placed in the middle of each rack, provides a single-source representation of all noise sources within the rack. Ffowcs Williams & Hawkings (FWH) acoustic model is employed. The target frequency is 1000 Hz, and the total simulation time for the transient analysis is 1.4 seconds, with a very small time step of 3e-5 seconds and 10 iterations to ensure convergence and accuracy. A User Defined Function (UDF) is developed to accurately simulate the acoustic noise source, and a Dynamic Mesh is applied to ensure acoustic wave propagation. Initial validation of the acoustic CFD simulation using a closed-form solution for the spherical propagation of an acoustic point source is performed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=data%20centers" title="data centers">data centers</a>, <a href="https://publications.waset.org/abstracts/search?q=FLUENT" title=" FLUENT"> FLUENT</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustics" title=" acoustics"> acoustics</a>, <a href="https://publications.waset.org/abstracts/search?q=sound%20pressure%20level" title=" sound pressure level"> sound pressure level</a>, <a href="https://publications.waset.org/abstracts/search?q=SPL" title=" SPL"> SPL</a>, <a href="https://publications.waset.org/abstracts/search?q=hot%20aisle%20containment" title=" hot aisle containment"> hot aisle containment</a>, <a href="https://publications.waset.org/abstracts/search?q=IBM" title=" IBM"> IBM</a> </p> <a href="https://publications.waset.org/abstracts/141377/acoustic-modeling-of-a-data-center-with-a-hot-aisle-containment-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/141377.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">182</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7389</span> Influence of Bragg Reflectors Pairs on Resonance Characteristics of Solidly Mounted Resonators</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Vinita%20Choudhary">Vinita Choudhary</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The solidly mounted resonator (SMR) is a bulk acoustic wave-based device consisting of a piezoelectric layer sandwiched between two electrodes upon Bragg reflectors, which then are attached to a substrate. To transform the effective acoustic impedance of the substrate to a near zero value, the Bragg reflectors are composed of alternating high and low acoustic impedance layers of quarter-wavelength thickness. In this work presents the design and investigation of acoustic Bragg reflectors (ABRs) for solidly mounted bulk acoustic wave resonators through analysis and simulation. This performance of the resonator is analyzed using 1D Mason modeling. The performance parameters are the effect of Bragg pairs number on transmissivity, reflectivity, insertion loss, the electromechanical and quality factor of the 5GHz operating resonator. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bragg%20reflectors" title="bragg reflectors">bragg reflectors</a>, <a href="https://publications.waset.org/abstracts/search?q=SMR" title=" SMR"> SMR</a>, <a href="https://publications.waset.org/abstracts/search?q=insertion%20loss" title=" insertion loss"> insertion loss</a>, <a href="https://publications.waset.org/abstracts/search?q=quality%20factor" title=" quality factor"> quality factor</a> </p> <a href="https://publications.waset.org/abstracts/164288/influence-of-bragg-reflectors-pairs-on-resonance-characteristics-of-solidly-mounted-resonators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164288.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">109</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7388</span> Bearing Condition Monitoring with Acoustic Emission Techniques</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Faisal%20AlShammari">Faisal AlShammari</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdulmajid%20Addali"> Abdulmajid Addali</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Monitoring the conditions of rotating machinery as bearing is important in order to improve its stability of works. Acoustic emission (AE) and vibration analysis are some of the most accomplished techniques used for this purpose. Acoustic emission has the ability to detect the initial phase of component degradation. Moreover, it has been observed that the success of vibration analysis does not take place below 100 rpm rotational speed. This because the energy generated below 100 rpm rotational speed is not detectable using conventional vibration. From this pint, this paper has presented a focused review of using acoustic emission techniques for monitoring bearings condition. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=condition%20monitoring" title="condition monitoring">condition monitoring</a>, <a href="https://publications.waset.org/abstracts/search?q=stress%20wave%20analysis" title=" stress wave analysis"> stress wave analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=low-speed%20bearings" title=" low-speed bearings"> low-speed bearings</a>, <a href="https://publications.waset.org/abstracts/search?q=bearing%20defect%20diagnosis" title=" bearing defect diagnosis"> bearing defect diagnosis</a> </p> <a href="https://publications.waset.org/abstracts/40780/bearing-condition-monitoring-with-acoustic-emission-techniques" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40780.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">320</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7387</span> Investigation of the Acoustic Properties of Recycled Felt Panels and Their Application in Classrooms and Multi-Purpose Halls</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ivanova%20B.%20Natalia">Ivanova B. Natalia</a>, <a href="https://publications.waset.org/abstracts/search?q=Djambova%20%D0%A2.%20Svetlana"> Djambova Т. Svetlana</a>, <a href="https://publications.waset.org/abstracts/search?q=Hristev%20S.%20Ivailo"> Hristev S. Ivailo</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The acoustic properties of recycled felt panels have been investigated using various methods. Experimentally, the sound insulation of the panels has been evaluated for frequencies in the range of 600 Hz to 4000 Hz, utilizing a small-sized acoustic chamber. Additionally, the sound absorption coefficient for the frequency range of 63 Hz to 4000 Hz was measured according to the EN ISO 354 standard in a laboratory reverberation room. This research was deemed necessary after conducting reverberation time measurements of a university classroom following the EN ISO 3382-2 standard. The measurements indicated values of 2.86 s at 500 Hz, 3.23 s at 1000 Hz, and 2.53 s at 2000 Hz, which significantly exceeded the requirements set by the national regulatory framework (0.6s) for such premises. For this reason, recycled felt panels have been investigated in the laboratory, showing very good acoustic properties at high frequencies. To enhance performance in the low frequencies, the influence of the distance of the panel spacing was examined. Furthermore, the sound insulation of the panels was studied to expand the possibilities of their application, both for the acoustic treatment of educational and multifunctional halls and for sound insulation purposes (e.g., a suspended ceiling with an air gap passing from room to room). As a conclusion, a theoretical acoustic design of the classroom has been carried out with suggestions for improvements to achieve the necessary acoustic and aesthetic parameters for such rooms. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20panels" title="acoustic panels">acoustic panels</a>, <a href="https://publications.waset.org/abstracts/search?q=recycled%20felt" title=" recycled felt"> recycled felt</a>, <a href="https://publications.waset.org/abstracts/search?q=sound%20absorption" title=" sound absorption"> sound absorption</a>, <a href="https://publications.waset.org/abstracts/search?q=sound%20insulation" title=" sound insulation"> sound insulation</a>, <a href="https://publications.waset.org/abstracts/search?q=classroom%20acoustics" title=" classroom acoustics"> classroom acoustics</a> </p> <a href="https://publications.waset.org/abstracts/167058/investigation-of-the-acoustic-properties-of-recycled-felt-panels-and-their-application-in-classrooms-and-multi-purpose-halls" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167058.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">95</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7386</span> Laser Ultrasonic Diagnostics and Acoustic Emission Technique for Examination of Rock Specimens under Uniaxial Compression</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Elena%20B.%20Cherepetskaya">Elena B. Cherepetskaya</a>, <a href="https://publications.waset.org/abstracts/search?q=Vladimir%20A.%20Makarov"> Vladimir A. Makarov</a>, <a href="https://publications.waset.org/abstracts/search?q=Dmitry%20V.%20Morozov"> Dmitry V. Morozov</a>, <a href="https://publications.waset.org/abstracts/search?q=Ivan%20E.%20Sas"> Ivan E. Sas</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Laboratory studies of the stress-strain behavior of rocks specimens were conducted by using acoustic emission and laser-ultrasonic diagnostics. The sensitivity of the techniques allowed changes in the internal structure of the specimens under uniaxial compressive load to be examined at micro- and macro scales. It was shown that microcracks appear in geologic materials when the stress level reaches about 50% of breaking strength. Also, the characteristic stress of the main crack formation was registered in the process of single-stage compression of rocks. On the base of laser-ultrasonic echoscopy, 2D visualization of the internal structure of rocky soil specimens was realized, and the microcracks arising during uniaxial compression were registered. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission" title="acoustic emission">acoustic emission</a>, <a href="https://publications.waset.org/abstracts/search?q=geomaterial" title=" geomaterial"> geomaterial</a>, <a href="https://publications.waset.org/abstracts/search?q=laser%20ultrasound" title=" laser ultrasound"> laser ultrasound</a>, <a href="https://publications.waset.org/abstracts/search?q=uniaxial%20compression" title=" uniaxial compression"> uniaxial compression</a> </p> <a href="https://publications.waset.org/abstracts/54531/laser-ultrasonic-diagnostics-and-acoustic-emission-technique-for-examination-of-rock-specimens-under-uniaxial-compression" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/54531.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">383</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7385</span> The Next Game Changer: 3-D Printed Musical Instruments</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Leonardo%20Ko">Leonardo Ko</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In an era marked by rapid technological innovation, the classical instrument industry nonetheless has not seen significant change. Is this a matter of stubborn traditionalism, or do old, conventional instruments really sound better? Because of the widespread use of 3-D printing, it seems feasible to produce modern, 3-D printed instruments that adhere to the basic conventions of standard construction. This study aimed to design and create a practical, effective 3-D printed acoustic violin. A cost-benefit analysis of materials and design is presented in addition to a report on sound tests in which a pool of professional musicians compared the traditional violin to its synthetic counterpart with regard to acoustic properties. With a low-cost yet functional instrument, musicians of all levels would be able to afford instruments with much greater ease; the present study thus hopes to contribute to efforts to increase the accessibility of classical music education. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20musical%20instrument" title="acoustic musical instrument">acoustic musical instrument</a>, <a href="https://publications.waset.org/abstracts/search?q=classical%20musical%20education" title=" classical musical education"> classical musical education</a>, <a href="https://publications.waset.org/abstracts/search?q=low-cost" title=" low-cost"> low-cost</a>, <a href="https://publications.waset.org/abstracts/search?q=3-D%20printing" title=" 3-D printing"> 3-D printing</a> </p> <a href="https://publications.waset.org/abstracts/39307/the-next-game-changer-3-d-printed-musical-instruments" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/39307.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">234</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7384</span> Design of an Acoustic Imaging Sensor Array for Mobile Robots</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Dibyendu%20Roy">Dibyendu Roy</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20Ramu%20Reddy"> V. Ramu Reddy</a>, <a href="https://publications.waset.org/abstracts/search?q=Parijat%20Deshpande"> Parijat Deshpande</a>, <a href="https://publications.waset.org/abstracts/search?q=Ranjan%20Dasgupta"> Ranjan Dasgupta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Imaging of underwater objects is primarily conducted by acoustic imagery due to the severe attenuation of electro-magnetic waves in water. Acoustic imagery underwater has varied range of significant applications such as side-scan sonar, mine hunting sonar. It also finds utility in other domains such as imaging of body tissues via ultrasonography and non-destructive testing of objects. In this paper, we explore the feasibility of using active acoustic imagery in air and simulate phased array beamforming techniques available in literature for various array designs to achieve a suitable acoustic sensor array design for a portable mobile robot which can be applied to detect the presence/absence of anomalous objects in a room. The multi-path reflection effects especially in enclosed rooms and environmental noise factors are currently not simulated and will be dealt with during the experimental phase. The related hardware is designed with the same feasibility criterion that the developed system needs to be deployed on a portable mobile robot. There is a trade of between image resolution and range with the array size, number of elements and the imaging frequency and has to be iteratively simulated to achieve the desired acoustic sensor array design. The designed acoustic imaging array system is to be mounted on a portable mobile robot and targeted for use in surveillance missions for intruder alerts and imaging objects during dark and smoky scenarios where conventional optic based systems do not function well. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20sensor%20array" title="acoustic sensor array">acoustic sensor array</a>, <a href="https://publications.waset.org/abstracts/search?q=acoustic%20imagery" title=" acoustic imagery"> acoustic imagery</a>, <a href="https://publications.waset.org/abstracts/search?q=anomaly%20detection" title=" anomaly detection"> anomaly detection</a>, <a href="https://publications.waset.org/abstracts/search?q=phased%20array%20beamforming" title=" phased array beamforming"> phased array beamforming</a> </p> <a href="https://publications.waset.org/abstracts/43887/design-of-an-acoustic-imaging-sensor-array-for-mobile-robots" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43887.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">415</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7383</span> Ant System with Acoustic Communication</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Saad%20Bougrine">Saad Bougrine</a>, <a href="https://publications.waset.org/abstracts/search?q=Salma%20Ouchraa"> Salma Ouchraa</a>, <a href="https://publications.waset.org/abstracts/search?q=Belaid%20Ahiod"> Belaid Ahiod</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelhakim%20Ameur%20El%20Imrani"> Abdelhakim Ameur El Imrani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Ant colony optimization is an ant algorithm framework that took inspiration from foraging behaviour of ant colonies. Indeed, ACO algorithms use a chemical communication, represented by pheromone trails, to build good solutions. However, ants involve different communication channels to interact. Thus, this paper introduces the acoustic communication between ants while they are foraging. This process allows fine and local exploration of search space and permits optimal solution to be improved. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20communication" title="acoustic communication">acoustic communication</a>, <a href="https://publications.waset.org/abstracts/search?q=ant%20colony%20optimization" title=" ant colony optimization"> ant colony optimization</a>, <a href="https://publications.waset.org/abstracts/search?q=local%20search" title=" local search"> local search</a>, <a href="https://publications.waset.org/abstracts/search?q=traveling%20salesman%20problem" title=" traveling salesman problem"> traveling salesman problem</a> </p> <a href="https://publications.waset.org/abstracts/7857/ant-system-with-acoustic-communication" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/7857.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">591</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7382</span> Acoustic Partial Discharge Propagation and Perfectly Matched Layer in Acoustic Detection-Transformer</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Nirav%20J.%20Patel">Nirav J. Patel</a>, <a href="https://publications.waset.org/abstracts/search?q=Kalpesh%20K.%20Dudani"> Kalpesh K. Dudani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Partial discharge (PD) is the dissipation of energy caused by localized breakdown of insulation. Power transformers are one of the most important components in the electrical energy network. Insulation degradation of transformer is frequently linked to PD. This is why PD detection is used in power system to monitor the health of high voltage transformer. If such problem are not detected and repaired, the strength and frequency of PD may increase and eventually lead to the catastrophic failure of the transformer. This can further cause external equipment damage, fires and loss of revenue due to an unscheduled outage. Hence, reliable online PD detection is a critical need for power companies to improve personnel safety and decrease the probability of loss of service. The PD phenomenon is manifested in a variety of physically observable signals including Ultra High Frequency (UHF) radiation and Acoustic Disturbances, Electrical pulses. Acoustic method is based on sensing the radiated acoustic emission from discharge sites in the insulation. Propagated wave from the PD fault site are captured sensor are consequently pre-amplified, filtered, recorded and analyze. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic" title="acoustic">acoustic</a>, <a href="https://publications.waset.org/abstracts/search?q=partial%20discharge" title=" partial discharge"> partial discharge</a>, <a href="https://publications.waset.org/abstracts/search?q=perfectly%20matched%20layer" title=" perfectly matched layer"> perfectly matched layer</a>, <a href="https://publications.waset.org/abstracts/search?q=sensor" title=" sensor "> sensor </a> </p> <a href="https://publications.waset.org/abstracts/28299/acoustic-partial-discharge-propagation-and-perfectly-matched-layer-in-acoustic-detection-transformer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/28299.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">530</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7381</span> Entropy Analysis of a Thermo-Acoustic Stack</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ahmadali%20Shirazytabar">Ahmadali Shirazytabar</a>, <a href="https://publications.waset.org/abstracts/search?q=Hamidreza%20Namazi"> Hamidreza Namazi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The inherent irreversibility of thermo-acoustics primarily in the stack region causes poor efficiency of thermo-acoustic engines which is the major weakness of these devices. In view of the above, this study examines entropy generation in the stack of a thermo-acoustic system. For this purpose two parallel plates representative of the stack is considered. A general equation for entropy generation is derived based on the Second Law of thermodynamics. Assumptions such as Rott’s linear thermo-acoustic approximation, boundary layer type flow, etc. are made to simplify the governing continuity, momentum and energy equations to achieve analytical solutions for velocity and temperature. The entropy generation equation is also simplified based on the same assumptions and then is converted to dimensionless form by using characteristic entropy generation. A time averaged entropy generation rate followed by a global entropy generation rate are calculated and graphically represented for further analysis and inspecting the effect of different parameters on the entropy generation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=thermo-acoustics" title="thermo-acoustics">thermo-acoustics</a>, <a href="https://publications.waset.org/abstracts/search?q=entropy" title=" entropy"> entropy</a>, <a href="https://publications.waset.org/abstracts/search?q=second%20law%20of%20thermodynamics" title=" second law of thermodynamics"> second law of thermodynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=Rott%E2%80%99s%20linear%20thermo-acoustic%20approximation" title=" Rott’s linear thermo-acoustic approximation"> Rott’s linear thermo-acoustic approximation</a> </p> <a href="https://publications.waset.org/abstracts/32388/entropy-analysis-of-a-thermo-acoustic-stack" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/32388.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">408</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7380</span> Innovative Acoustic Emission Techniques for Concrete Health Monitoring</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rahmat%20Ali">Rahmat Ali</a>, <a href="https://publications.waset.org/abstracts/search?q=Beenish%20Khan"> Beenish Khan</a>, <a href="https://publications.waset.org/abstracts/search?q=Aftabullah"> Aftabullah</a>, <a href="https://publications.waset.org/abstracts/search?q=Abid%20A.%20Shah"> Abid A. Shah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This research is an attempt to investigate the wide range of events using acoustic emission (AE) sensors of the concrete cubes subjected to different stress condition loading and unloading of concrete cubes. A total of 27 specimens were prepared and tested including 18 cubic (6”x6”x6”) and nine cylindrical (4”x8”) specimens were molded from three batches of concrete using w/c of 0.40, 0.50, and 0.60. The compressive strength of concrete was determined from concrete cylinder specimens. The deterioration of concrete was evaluated using the occurrence of felicity and Kaiser effects at each stress condition. It was found that acoustic emission hits usually exceeded when damage increases. Additionally, the correlation between AE techniques and the load applied were determined by plotting the normalized values. The influence of w/c on sensitivity of the AE technique in detecting concrete damages was also investigated. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustic%20emission" title="acoustic emission">acoustic emission</a>, <a href="https://publications.waset.org/abstracts/search?q=concrete" title=" concrete"> concrete</a>, <a href="https://publications.waset.org/abstracts/search?q=felicity%20ratio" title=" felicity ratio"> felicity ratio</a>, <a href="https://publications.waset.org/abstracts/search?q=sensors" title=" sensors"> sensors</a> </p> <a href="https://publications.waset.org/abstracts/53667/innovative-acoustic-emission-techniques-for-concrete-health-monitoring" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/53667.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">366</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7379</span> Ultrasound Mechanical Index as a Parameter Affecting of the Ability of Proliferation of Cells </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Z.%20Hormozi%20Moghaddam">Z. Hormozi Moghaddam</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Mokhtari-Dizaji"> M. Mokhtari-Dizaji</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Movahedin"> M. Movahedin</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20E.%20Ravari"> M. E. Ravari </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Mechanical index (MI) is used for quantifying acoustic cavitation and the relationship between acoustic pressure and the frequency. In this study, modeling of the MI was applied to provide treatment protocol and to understand the effective physical processes on reproducibility of stem cells. The acoustic pressure and MI equations are modeled and solved to estimate optimal MI for 28, 40, 150 kHz and 1 MHz frequencies. Radial and axial acoustic pressure distribution was extracted. To validate the results of the modeling, the acoustic pressure in the water and near field depth was measured by a piston hydrophone. Results of modeling and experiments show that the model is consistent well to experimental results with 0.91 and 0.90 correlation of coefficient (p<0.05) for 1 MHz and 40 kHz. Low intensity ultrasound with 0.40 MI is more effective on the proliferation rate of the spermatogonial stem cells during the seven days of culture, in contrast, high MI has a harmful effect on the spermatogonial stem cells. This model provides proper treatment planning <em>in vitro</em> and <em>in vivo</em> by estimating the cavitation phenomenon. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ultrasound" title="ultrasound">ultrasound</a>, <a href="https://publications.waset.org/abstracts/search?q=mechanical%20index" title=" mechanical index"> mechanical index</a>, <a href="https://publications.waset.org/abstracts/search?q=modeling" title=" modeling"> modeling</a>, <a href="https://publications.waset.org/abstracts/search?q=stem%20cell" title=" stem cell"> stem cell</a> </p> <a href="https://publications.waset.org/abstracts/63084/ultrasound-mechanical-index-as-a-parameter-affecting-of-the-ability-of-proliferation-of-cells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63084.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> 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