نتایج جستجو برای: passive noise control
تعداد نتایج: 1562069 فیلتر نتایج به سال:
noise is considered as one of the most severe sources of environmental and workplace constraints. many noise effects are well known on immune function, hormonal levels, cardiovascular and respiratory systems. in this study, our aim is to evaluate the effects of traffic noise exposure on basal and stimulated gastric pepsin secretion. 48 male rats were exposed to traffic noise (86 db) for a short...
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...
background & aim : ventilator associated pneumonia (vap) is the most common infections in critical care units, which leads to more length of hospital stay, costs, and high mortality. therefore, prevention is a priority according to clinical guidelines. the aim of this study is determine the effects of passive versus active implementation of vap guidelines on nurses’ performance in critical care...
This paper reports on an investigation into the feasibility of using active and passive means of vibration control in aerospace structures. In particular, attention is focused on controlling vibration transmission through light weight satellite structures at medium frequencies. The initial structure under test here is a 4.5-meter long satellite boom consisting of 10 identical bays with equilate...
BACKGROUND Noise pollution is currently a major risk factor in industries in both developed and developing countries.The present study assessed noise pollution in the knitting industry in Iran in 2009 and presented a control method to reduce the rate of noise generation. METHODS The overall noise level was estimated using the network environmental noise assessment method in Sina Poud textile ...
Introduction: In the steel industry,air blowers used to supply compressed air are considered as sources of annoying noise. This study aims to acoustics analysis of theairblower workroomand sound source characteristics in order to present noise controlmeasuresinthe steel industry. .Material and Method: Measurement of noiselevel and its frequency analysis was performed usingsound levelmetermod...
The paper presents experimental research carried out to determine the possible actions reduce noise generated by trams in a highly urbanised area. A few design strategies affecting tram ride quality have been presented – especially aspect of acoustic phenomena. Main sources were characterised. includes selected results comprehensive studies pass-by test based on authors’ methodology. tests vari...
Introduction: exposure to noise pollution leaves Different effects on human. Goal in this Paper is the prioritizing methods of control and reduce noise pollution in Larestan cement Factory using analytical hierarchy process (AHP). Methods: For screening criteria and methods used in AHP technique, Delphi method was used. After polling of 15 experts, 8 criteria and 9 methods was selected from ...
As a practical method, the passive scheme has been used to analyze the security of an untrusted source in quantum key distribution. In the passive scheme, one can utilize average-photon-number (APN) monitor, photon-number-distribution (PND) monitor and photon-number analyzer (PNA) to achieve the unconditional security with using BB84 protocol or decoy-state protocol. In this paper, the ClopperP...
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