نتایج جستجو برای: passive noise control
تعداد نتایج: 1562069 فیلتر نتایج به سال:
The paper considers the multipath signal and noise reduction problem in passive radar. A unified framework is provided for joint of signals both Gaussian non-Gaussian circumstances. traditional clutter cancellation methods are incorporated this corresponding to circumstance. Based on framework, a method (JRM) developed suppressing noise. Specifically, explicitly discussed. Analytical analysis p...
Helicopters generate substantial noise levels, especially at low frequency. These noise levels are normally not harmful for rpm Rotation per minute the ear. However, the low frequency content masks the speech . Therefore, pilots tend to set the communication system at maximum level so that the sound levels reach severe amplitudes for the ear. These high sound levels are exposing the ear to fati...
LONG-TERM GOALS • To evaluate feasibility and determine physical limits of performance of a passive acoustic system for characterization of a time-varying ocean where ambient acoustic noise is utilized as a probing signal. • To develop a passive remote sensing technique for acoustic characterization of oceanic currents. OBJECTIVES 1. To demonstrate theoretically emergence of the deterministic G...
Background: There is a long history of using physical activities and herbal medications to cure psychological diseases such as stress and anxiety. The aim of this study was to assess the effect of training, extract of Althaea kurdica flower and noise stress on the anxiety of Wistar male rats. Methods: Thirty-five male rats were randomly divided into five groups: the noise group (n=7), traini...
noise is considered as one of the most severe sources of environmental and work place constraints. noise effects on immune function, hormonal levels, cardiovascular and respiratory systems are well known. the aim of the study is to evaluate the effects of traffic noise on basal and stimulated gastric acid secretion. 48 healthy rats were divided into five traffic noise exposures (1, 7, 14, 21, 2...
Aims: Noise is considered the most harmful physical agents in the workplace which exposure to it can cause the harmful physical and psychological effects on worker. Since the best noise control measures is to reduce or limit the at the source, the purpose of this study was to assess the noise pollution and determine the dominant sound source in an Air production plant of a Petrochemical industr...
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