نتایج جستجو برای: equivalent sound level
تعداد نتایج: 1290264 فیلتر نتایج به سال:
the aim of the present study was to assess the industrial noise pollution and its effects on the blood pressure of workers during activities intextile factory in ilam,which is situated in west of iran. a cross-sectional study was performed on a group included 81 workers and 30 people as sample and control group, respectively. a questionnaire was filled out and then the other measurements includ...
testing plays a vital role in any language teaching program. it allows teachers and stakeholders, including program administrators, parents, admissions officers and prospective employers to be assured that the learners are progressing according to an accepted standard (douglas, 2010). the problems currently facing language testers have both practical and theoretical implications but the first i...
Previous studies have shown that daily, moderate-level sound exposure, or conditioning, can reduce injury from a subsequent high-level noise exposure. We tested the hypothesis that this conditioning produces an increased activity in the olivocochlear efferent reflex, a reflex known to provide protection to the cochlea. Guinea pigs were conditioned by a 10-day intermittent exposure to 2-4 kHz no...
needed which are versatile, responsive to users’ sounds organised according to referential attributes. expectations, and have high audio quality. Moreover, model Nowadays, a common terminology is available for flexibility for human–machine interaction is a major issue. describing sound objects both from a phenomenoModels based on the physics of actual or virtual objects can logical or a referen...
Background and Objective: Noise pollution is one of the serious environmental issue. Sound control technologies based on sound absorption and sound insulation are considered as the two widely used methods. Therefore, the aim of this study was to modify silica aerogel nanocomposites to improve its acoustic properties. Materials and Methods: This applied experimental research involved in examin...
Background and Objective: Noise pollution causes many physiological, psychological, economic and social effects on human life. This issue is more important in the environment of industrial workplaces. This research aimed to adopt the functions of GIS for evaluating and spatial analysis of noises in industrial environments. Materials and Methods: At the initial step, the spatial data for indust...
Determining the Hydro-acoustic Characteristics of the Ship Propeller in Uniform and Non-uniform Flow
This research has been carried out to determine the marine propeller hydro-acoustic characteristics by Reynolds-Averaged Navier-Stokes (RANS) solver in both uniform and non-uniform wake flow at different operating conditions Wake flow can cause changes in pressure fluctuation and gas effect on propeller noise spectrum. Noise is generated by the induced trailing vortex wake and induced pressure ...
Introduction: Limited studies have been done to evaluate the whole-body vibration (WBV) exposure experienced by Taxi drivers. Therefore, the aim of this study was to evaluate the exposure to whole body vibration and repeated shocks in urban taxi drivers and also to compare different methods of evaluation in this job environment. Material and Method: Measurement and evaluation process were co...
Noise pollution is one of the common physical harmful factors in many work environments. The current study aimed to assess personal and environmental sound pressure level project sound-Isosonic map Razavi Khorasan Paste manufacture using Surfer V.14 at V.5.0. This cross-sectional, descriptive analytical that was conducted 2018 factory contains Canister, production Brewing unit. Following ISO 96...
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