نتایج جستجو برای: acoustic barriers
تعداد نتایج: 166440 فیلتر نتایج به سال:
Underwater acoustics is widely used in many applications, such as oceanography, marine biology, hydrography, fishery, etc. Different models are introduced to simulate the underwater acoustic propagation in the oceans and the seas. In this study, the Ray Theory model is used to simulate the acoustic wave propagation in a shallow-freshwater river (Gono River) located in western part of Japan. The...
in this study, the disadvantages of wood, which is widely employed in producing music instruments, are discussed. for example, high moisture sensitivity, low impact resistance, and time-consuming procedure as well as various properties of different species or in several parts of one specimen which are the main problems of wooden music instruments are extensively discussed in this paper. many ma...
the aim of this study was to investigate developmental barriers of sport for all in selected state universities of tehran city and to present strategies to developing it. the method of this study was descriptive-correlation and application in terms of aim. the statistical population consisted of all male and female faculty members of faculties of physical education and sport sciences of selecte...
Background: Since in multiple sclerosis (MS), changes in speech and voice quality often precede other signs and symptoms; early diagnosis of these changes is necessary. In this study, an acoustic examination of phonation subsystem was performed. Due to the progressive nature of multiple sclerosis, the aim of this study was to examine the correlation between acoustic parameters ...
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...
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...
abstractgene therapy is a therapeutic approach to deliver genetic material into cells to alter their function in entire organism. one promising form of gene delivery system (dds) is liposomes. the success of liposome-mediated gene delivery is a multifactorial issue and well-designed liposomal systems might lead to optimized gene transfection particularly in vivo. liposomal gene delivery systems...
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...
Realisation of a device intended for the manipulation and detection of bead-tagged DNA and other bio-molecules is presented. Acoustic radiation forces are used to manipulate polystyrene micro-beads into an optical evanescent field generated by a laser pumped ion-exchanged waveguide. The evanescent field only excites fluorophores brought within approximately 100 nm of the waveguide, allowing the...
The improvement of high temperature materials with lower heat transfer coefficients lead to the development thermal barrier coatings (TBCs). One most widely used for is Y2O3 stabilized ZrO2 (Y-TZP) because its excellent shock resistance, low conductivity, and relatively coefficient expansion. aim this work study TBCs mechanical behavior addition SiC into suspension Y-TZP/Al2O3 by acoustic emiss...
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