نتایج جستجو برای: acoustic analysis

تعداد نتایج: 2892799  

ژورنال: بهداشت و ایمنی کار 2021
Ahmadi Asour, Akbar , Fasih-Ramandi, Fatemeh , Hashemi, Zahra , Keyvani, Sepideh , Kolahdouzi, Malihe , Monazzam Esmaielpour, Mohammadreza ,

Introduction: The acoustic performance of natural fiber adsorbents has been investigated in numerous studies. A part of these materials show a poor adsorption within the frequency range of less than 1000 Hz. In the present study, attempts were made to investigate the effect of layout sequence of double-layered composites consisting of natural and synthetic fibers on improving the acoustic adsor...

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Journal: :middle east journal of rehabilitation and health studies 0
fatemeh kasbi neuromuscular rehabilitation research center, rehabilitation college, semnan university of medical sciences, semnan, ir iranrehabilitation research center, semnan university of medical sciences, rehabilitation college, semnan, ir iran ali sadollahi neuromuscular rehabilitation research center, rehabilitation college, semnan university of medical sciences, semnan, ir iranrehabilitation research center, semnan university of medical sciences, rehabilitation college, semnan, ir iran jalal bakhtiyari neuromuscular rehabilitation research center, rehabilitation college, semnan university of medical sciences, semnan, ir iranrehabilitation research center, semnan university of medical sciences, rehabilitation college, semnan, ir iran raheb ghorbani research center for social determinants of health, semnan university of medical sciences, semnan, ir iran marziyeh maddah rehabilitation college, semnan university of medical sciences, semnan, ir iran maryam mokhlesin neuromuscular rehabilitation research center, rehabilitation college, semnan university of medical sciences, semnan, ir iranrehabilitation research center, semnan university of medical sciences, rehabilitation college, semnan, ir iran; neuromuscular rehabilitation research center, rehabilitation college, semnan university of medical sciences, semnan, ir iran. tel: +98-2333654180, fax: +98-2333654209

conclusions significant difference in the fundamental frequency, jitter, shimmer, silence duration, friction duration, vocalization duration, and vocal cords contact quality index between the two groups was observed (p < 0.01). results the mean of fundamental frequency for the hearing loss children and the control group were 323.04 hz and 267.53 hz, jitter 10.05% and 1.52%, shimmer 17.24 and 5....

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2004

In this paper, Lamb's technique, (1) which was used to study acoustic radiation due to an external force acting in an infinite isotropic solid or over the surface of an isotropic solid, has been extended to the case of general anisotropic media. The far-field radiation is numerically calculated for a vibrating point source in an infinite anisotropic solid or on the free surface of a semi-infini...

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Journal: :Srpski arhiv za celokupno lekarstvo 2009

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Journal: :The Journal of the Acoustical Society of America 1973

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Journal: :IOP Conference Series: Materials Science and Engineering 2018

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Journal: :Journal of Phonetics 1985

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Journal: :The Journal of the Acoustical Society of America 1959

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Journal: :The Journal of International Advanced Otology 2017

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Journal: :The Journal of the Acoustical Society of America 1993

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