Long term estimations of low frequency noise levels over water from an off-shore wind farm

2014 ◽  
Vol 135 (3) ◽  
pp. 1106-1114 ◽  
Author(s):  
Karl Bolin ◽  
Martin Almgren ◽  
Esbjörn Ohlsson ◽  
Ilkka Karasalo
Keyword(s):  
Wind Farm ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Levels

Recurrence Plot Analysis of HRV for Exposure to Low-Frequency Noise

2014 ◽  
Vol 1044-1045 ◽  
pp. 1251-1257 ◽  
Author(s):  
Shih Tsung Chen ◽  
Chia Yi Chou ◽  
Li Ho Tseng
Keyword(s):  
Low Frequency ◽  
Cardiovascular Responses ◽  
Recurrence Plot ◽  
Frequency Noise ◽  
Cardiovascular Activity ◽  
Low Frequency Noise ◽  
Noise Levels ◽  
Noise Condition ◽  
Plot Analysis ◽  
Recurrence Plot Analysis

Previous studies have indicated that the chronic effects of exposure to low-frequency noise causes annoyance. However, during the past two decades, most studies have employed questionnaires to characterize the effects of noise on psychosomatic responses. This study investigated cardiovascular activity changes in exposure to low-frequency noise for various noise intensities by using recurrence plot analysis of heart rate variability (HRV) estimation. The authors hypothesized that distinct noise intensities affect cardiovascular activity, which would be reflected in the HRV and recurrence quantification analysis (RQA) parameters. The test intensities of noises were no noise, 70-dBC, 80-dBC, and 90-dBC. Each noise level was sustained for 5 min, and the electrocardiogram (ECG) was recorded simultaneously. The cardiovascular responses were evaluated using RQA of the beat-to-beat (RR) intervals obtained from ECG signals. The results showed that the mean RR interval variability and mean blood pressure did not substantially change relative to the noise levels. However, the length of the longest diagonal line (Lmax) of the RQA of the background noise (no noise) condition was significantly lower than the 70-dBC, 80-dBC, and 90-dBC noise levels. The laminarity showed significant changes in the noise levels of various intensities. In conclusion, the RQA-based measures appear to be an effective tool for exposure to low-frequency noise, even in short-term HRV time series.

Estimation of the long-term stability of piezoresistive LTCC pressure sensors by means of low-frequency noise measurements

2013 ◽  
Vol 199 ◽  
pp. 334-343 ◽  
Author(s):  
Marina Santo Zarnik ◽  
Vlasta Sedlakova ◽  
Darko Belavic ◽  
Josef Sikula ◽  
Jiri Majzner ◽  
...  
Keyword(s):  
Pressure Sensors ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Term Stability ◽  
Long Term Stability ◽  
Noise Measurements

Annoyance Due to Environmental Low Frequency Noise and Source Location — A Case Study

1989 ◽  
Vol 8 (2) ◽  
pp. 30-39 ◽  
Author(s):  
R.N. Vasudevan ◽  
H.G. Leventhall
Keyword(s):  
Field Study ◽  
Microphone Array ◽  
Low Frequency ◽  
Source Location ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Levels ◽  
Industrial Source

This case study shows that objective criteria usually based solely on the dB(A) scale are not adequate in evaluating the annoyance due to low frequency noise. Levels which are often low enough to discount the likelihood of a noise nuisance, however, were found to be subjectively annoying. The field study reported here demonstrates that the complainant's annoyance response was due more to the unpleasant nature of the low frequency noise than to its actual level. Positive location of a distant industrial source with the aid of a specially designed three element microphone array provided much needed relief to the complainant.

Low frequency noise and long-term stability of noncoherent light sources

2004 ◽  
Vol 96 (2) ◽  
pp. 966-969 ◽  
Author(s):  
S. L. Rumyantsev ◽  
M. S. Shur ◽  
Yu. Bilenko ◽  
P. V. Kosterin ◽  
B. M. Salzberg
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Light Sources ◽  
Low Frequency Noise ◽  
Term Stability ◽  
Long Term Stability ◽  
Noncoherent Light
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