نتایج جستجو برای: noise criteria

تعداد نتایج: 449163  

Journal: :ElectroComponent Science and Technology 1977

اسحاقی, محبوبه, ریاحی خرم, مهدی, گلمحمدی, رستم,

Introduction: The purpose of this study was prioritizing the noise control methods using Analytic Hierarchy Process (AHP) technique in Hamadan glass industry. .Material and Method: This is a cross-sectional – descriptive - analytical study. According to a survey of experts by questionnaire and Delphi method four criteria were selected including cost, efficiency, executive capability and not...

حاجی زاده, روح اله, حقیقت, مجتبی, شبگرد, زهره, مرادی راد, روح الدین, موسوی, سیدمهدی, یزدانی راد, سعید,

Introduction: Noise is one of the most harmful industrial agents and there are different methods to control it. Fuzzy analytical hierarchy process is an appropriate technique for selecting the best choice among several control methods. Therefore, the aim of this study was the selection of the most suitable sound control method using fuzzy hierarchical analysis (FAHP) technique in a refinery pla...

شایسته, کامران, غریبی, شیوا,

Traffic noise pollution is a serious threat to wildlife species, resulting in isolating and reducing the population. The Asian Highway of Tehran-Mashhad, from which a 26.51 km long part is located inside Golestan National Park, is the main source of noise disturbance inside the area. The purpose of this study was to determine the most important criteria for noise pollution of this road; in orde...

Journal: :The Journal of the Acoustical Society of America 1990

Journal: :American Journal of Applied Sciences 2005

Journal: :Journal of Sound and Vibration 1976

جهانگیری, مهدی , حقیقی کفاش, زهره , فرهنگ دهقان, سمیه , منظم, محمد رضا , نصیری, پروین ,

Introduction: Noise is one of the most common health hazards at the workplaces that can cause not only somatic problems, but also adversely affect mental health. The aim of this study was to investigate and evaluate occupational noise exposure and noise annoyance in one of the petrochemical companies. .Material and Method: The study population included 47 people working in Administrative and ...

1997
Tim Haulick Klaus Linhard Peter Schrogmeier

Speech enhancement techniques using spectral subtraction have the drawback of generating residual noise with a musical character, so-called musical noise. We developed a new post-processing method for suppressing this musical residual noise. In this method, the auditory masking threshold is calculated twice, once before the spectral subtraction and once again afterwards. This ensures that all a...

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