نتایج جستجو برای: acoustic

تعداد نتایج: 85922  

In this paper, the acoustic wave propagation in multilayer Thue-Morse structures has theoretically been studied. The composing layers were assumed do be Cu, Al, Mgo and Pb materials. Two, three or four different materials have been used in a typical structure. By using a perpendicular incident acoustic wave, the transmission coefficient was calculated and then by its old, the frequency gaps was...

Journal: :iranian journal of otorhinolaryngology 0
ali goljanian tabrizi department of otolaryngology, shaheed beheshti university of medical sciences, tehran, iran. abbas safavi naeini department of otolaryngology, shaheed beheshti university of medical sciences, tehran, iran. nima baradaran department of otolaryngology, shaheed beheshti university of medical sciences, tehran, iran.

introduction:although several treatment approaches have been proposed for tinnitus, there are currently no food and drug administration (fda)-approved agents available to treat this condition. in this study, we evaluated the effect of gabapentin on the sensation of subjective tinnitus in patients with acoustic trauma referring to the ear, nose and throat (ent) clinic of taleghani hospital durin...

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Background and Objective: A practical method for noise control in environments with different noise sources is designing an acoustic cabin for the workers. In this regard, this study aimed to assess the efficiency of the acoustic cabin in a typical turbine unit of a thermal power plant to provide acoustic comfort. Materials and Methods: Measurement of the noise level and spectrum, as well as v...

Journal: :thrita 0
mohaddese tarazani speech therapy department, tehran university of medical siences, tehran, ir iran seyyedeh maryam khoddami speech therapy department, tehran university of medical siences, tehran, ir iran; tehran university of medical sciences, school of rehablitation, madar square, nezam alley, shahnazari street, mirdamad street, tehran, ir iran. tel: +98-2122228051(155), fax: +98-2122220946 shohre jalaie physiotherapy department, tehran university of medical siences, tehran, ir iran saeed talebian moghadam physiotherapy department, tehran university of medical siences, tehran, ir iran mohammad akbari physiotherapy department, tehran university of medical siences, tehran, ir iran

results certain correlations were found between fundamental frequency in vowel and total vhi, physical, functional and emotional domains of vhi in group 1 (r = 0.636, 0.649, 0.613 and 0.592 respectively). there was good correlation between speaking fundamental frequency and total vhi and its subscales - except the physical subscale - were also correlated. in group 2, the correlations between ji...

In the present paper, the phonological feature geometry of the Persian phonemes is analyzed in the form of articulate-free and articulate-bound features based on the articulator model of the nonlinear phonology. Then, the reference phonetic pattern of each feature that consists of one or a set of acoustic correlates, characterized by the quantitative or qualitative values in its phonological re...

Background: Vocal abuse and misuse would result in vocal fold polyp. Certain features define the extent of vocal folds polyp effects on voice acoustic parameters. The present study aimed to define the effects of polyp size on acoustic voice parameters, and compare these parameters in hemorrhagic and non-hemorrhagic polyps.Methods: In the present retrospective study, 28 individuals with hemorrha...

Journal: :نقش جهان - مطالعات نظری و فناوری های نوین معماری و شهرسازی 0
farbod abed abed master of architecture, tehran university, kish international campus, tehran, iran alireza einifar associate professor in university college of fine arts university of tehran, ph.d. in the same field from university of new south wales, sydney, australia

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Journal: :تحقیقات مهندسی کشاورزی 0
محمود امید دانشیار گروه مکانیک ماشین های کشاورزی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران اصغر محمودی استادیار گروه مکانیک ماشین های کشاورزی دانشگاه تبریز مهدی علی اکبری دانشجوی سابق کارشناسی ارشد اسدالله اکرم استادیار گروه مکانیک ماشین های کشاورزی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران

in this study, an intelligent system for sorting closed shell and open shell pistachio nuts, was designed and developed based on combined acoustic and artificial neural network (ann) techniques. the system included a microphone, pc, material handling equipment and an air reject pneumatic mechanism. the microphone, placed under the steel plate, received sound signals generated by the pistachio n...

Journal: :archives of trauma research 0
masoud motalebi kashani occupational health department, health faculty, kashan university of medical sciences, ir iran +98-3615550111, [email protected]سازمان اصلی تایید شده: دانشگاه علوم پزشکی کاشان (kashan university of medical sciences) hamidreza saberi trauma research center, kashan university of medical sciences, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی کاشان (kashan university of medical sciences) mitra hannani occupational health department, health faculty, kashan university of medical sciences, ir iran +98-3615550111, [email protected]; occupational health department, health faculty, kashan university of medical sciences, ir iran +98-3615550111, [email protected]سازمان اصلی تایید شده: دانشگاه علوم پزشکی کاشان (kashan university of medical sciences)

background acoustic trauma is an injury to the hearing mechanisms in the inner ear due to excessive noise. this injury is the most prevalent cause of sensorineural hearing loss in humans, especially from occupational exposure. previous studies have shown the essential role of free radical formation in the inner ear hearing loss caused by acoustic trauma. objectives this study was performed to d...

Soundscape analysis, using acoustic indices, provides researchers with valuable ecological information to assess biodiversity, species behavior, and noise pollution. In this study,  to analyze biophonies and anthrophony in six urban parks in  Isfahan city in spring, six acoustic indices, including Acoustic complexity index (ACI), Acoustic Diversity Index (ADI), Acoustic Evenness Index (AEI), an...

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