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Influence of exostoses on hearing
Vališová, Šárka ; Švancara, Pavel (referee) ; Pellant, Karel (advisor)
Exostoses are periosteophyte inside the external auditory canal of the human ear. The main objective of this bachelor´s thesis is to determine the potencial impact of the shape modification of the external auditory canal due to occurence of exostoses on the mechanical sound transmission into the internal ear. The task was solved by FEM modelling performed in the ANSYS system. The simple finite element 2D model of the normal human ear has been taken from the diploma thesis B. Ouali: Development of 2D finite element model of human ear (BUT Brno, 2009), the model included the external ear canal, elastic eardrum, otitis cavity with the otitis ossicles and the cavity of the internal ear. The changes simulating exostoses in form of two opposite semicircles were performed. The different size and position of the symmetrical exostoses were studied. The influence of the exostoses on the sound transfer characteristics of the external ear canal was discused. It was processed the set of the audiograms (19 patients). The results of the modelling and the results of the audiology were compared, the preoperativ and the postoperativ stages were considered.
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Influence of exostoses on ear sound transfer function
Vališová, Šárka ; Švancara, Pavel (referee) ; Pellant, Karel (advisor)
Exostoses are surface periosteophyte inside the external auditory canal of the human ear. The main objective of the diploma thesis is to determine the potencial impact of the narrowing of external auditory canal by exostoses on the mechanical sound transmission into the internal ear. The task was solved by FEM modelling in the ANSYS system. The simple finite element 2D model of the normal human ear was used and it has been taken from the diploma thesis B Ouali: Development of 2D finite element model of human ear (BUT Brno, 2009). At the model, including the external ear canal, elastic eardrum, otitis cavity with otitis ossicles and the cavity of the internal ear with internal ear partition, the alterations simulating different size of narrowing a and different positionig of exostoses were done. The influence of the exostoses on the sound transfer characteristics for air sound transmission and for bone sound transmission was discused. The results were analysed and compared with audiology.
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Influence of exostoses on ear sound transfer function
Vališová, Šárka ; Švancara, Pavel (referee) ; Pellant, Karel (advisor)
Exostoses are surface periosteophyte inside the external auditory canal of the human ear. The main objective of the diploma thesis is to determine the potencial impact of the narrowing of external auditory canal by exostoses on the mechanical sound transmission into the internal ear. The task was solved by FEM modelling in the ANSYS system. The simple finite element 2D model of the normal human ear was used and it has been taken from the diploma thesis B Ouali: Development of 2D finite element model of human ear (BUT Brno, 2009). At the model, including the external ear canal, elastic eardrum, otitis cavity with otitis ossicles and the cavity of the internal ear with internal ear partition, the alterations simulating different size of narrowing a and different positionig of exostoses were done. The influence of the exostoses on the sound transfer characteristics for air sound transmission and for bone sound transmission was discused. The results were analysed and compared with audiology.
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Influence of exostoses on hearing
Vališová, Šárka ; Švancara, Pavel (referee) ; Pellant, Karel (advisor)
Exostoses are periosteophyte inside the external auditory canal of the human ear. The main objective of this bachelor´s thesis is to determine the potencial impact of the shape modification of the external auditory canal due to occurence of exostoses on the mechanical sound transmission into the internal ear. The task was solved by FEM modelling performed in the ANSYS system. The simple finite element 2D model of the normal human ear has been taken from the diploma thesis B. Ouali: Development of 2D finite element model of human ear (BUT Brno, 2009), the model included the external ear canal, elastic eardrum, otitis cavity with the otitis ossicles and the cavity of the internal ear. The changes simulating exostoses in form of two opposite semicircles were performed. The different size and position of the symmetrical exostoses were studied. The influence of the exostoses on the sound transfer characteristics of the external ear canal was discused. It was processed the set of the audiograms (19 patients). The results of the modelling and the results of the audiology were compared, the preoperativ and the postoperativ stages were considered.
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Estimation of mechanical properties of thin Al surface layer
Petráčková, Klára ; Kuběna, Ivo ; Truhlář, Michal ; Náhlík, Luboš ; Kruml, Tomáš
The paper describes a new method for testing of thin layers, so-called microcompression test. As an example determination of Al thin film properties deposited on Si substrate is introduced in the paper. Microcompression combines the sample preparation with the use of focused ion beam (FIB) with a compression test carried out using nanoindenter. Cylindrical specimens (pillars) were prepared in Al film using FIB. The typical diameter of pillars was about 1.3 μm and their height was about 2 μm. The results depend on crystallographic orientation of pillar. Stress-strain curves of the thin film were obtained. Experimentally measured data on pillars needs correction to obtain undistorted material properties of Al thin film. A necessary correction using finite element modeling is suggested in the paper. The paper contributes to a better characterization of very thin surface layers and determination of their mechanical properties.
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