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Subjective annoyance caused by indoor low-level and low frequency noise and control method

Journal of Environmental Sciences 2005年第1期17卷 135-140页

作者： DIGuo-qing ZHANGBang-jun SHANGQi DepartmentofEnvironmentalScience ZhejiangUniversityHangzhou310028China

The influence of low_level noise has not been widely noticed. This paper discovered that low_level and low frequency noise(A_weighted equivalent level L eq <45 dB) causes higher probability of subjective annoyance. Th... 详细信息

The influence of low_level noise has not been widely noticed. This paper discovered that low_level and low frequency noise(A_weighted equivalent level L eq threshold level of subjective annoyance from noise in this study; there is preferable relationship between the indoor noise and noise annoyance at low frequency noise level. Study indicated at the same centered noise level, the change of annoyance probability is mainly caused by the change of the frequency spectrum characteristic of the indoor noise. Under low noise level environment, without change of the medium_low frequency noise, the slight increase of medium_high frequency noise level with the help of noise sheltering effect can significantly reduce the noise annoyance. This discovery brings a new resolution on how to improve the environmental quality of working or living places. A noise control model is given in this study according to the acoustic analysis.

关键词： low-level noise subjective annoyance threshold level structural noise indoor noise noise control

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Background Concentrations of Heavy Metals in Brown Algae from the Northwest Sea of Japan

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Journal of Geoscience and Environment Protection 2020年第10期8卷 147-155页

作者： Elena N. Chernova Svetlana I. Kozhenkova Pacific Geographical Institute Far Eastern Branch Russian Academy of Sciences Vladivostok Russia

Background concentrations of Fe, Mn, Cu, Zn, Pb, Cd, and Ni were calculated for brown algae Costaria costata from the northwest Sea of Japan. Also the paper contains refined data on heavy metal concentrations in the widespread distributed brown algae, such as Stephanocystis crassipes, Sargassum pallidum and S. miyabei. As the upper threshold levels of metal background concentrations, the median values plus double medians of absolute deviations from the medians were used (Me + 2MAD). The lower threshold level of the background concentration equal to the physiological need for an element is the median of 15% minimum values in the sampling minus the double median of absolute deviations from the median (Me15 - 2MAD15). The calculated ranges of the background concentrations of metals in algae were compared with concentrations of elements in mac-rophytes collected from habitats with background concentrations of metals in water.

关键词： Heavy Metals Background Concentrations of Metals threshold level Algae Costaria costata Biomonitoring Northwest Sea of Japan

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Background Concentrations of Heavy Metals in Brown Algae from the Northwest Sea of Japan

Background Concentrations of Heavy Metals in Brown Algae fro...

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作者： Elena N.Chernova Svetlana I.Kozhenkova Pacific Geographical Institute Far Eastern BranchRussian Academy of Sciences

Background concentrations of Fe, Mn, Cu, Zn, Pb, Cd, and Ni were calculated for brown algae Costaria costata from the northwest Sea of Japan. Also the paper contains refined data on heavy metal concentrations in the widespread distributed brown algae, such as Stephanocystis crassipes, Sargassum pallidum and S. miyabei. As the upper threshold levels of metal background concentrations, the median values plus double medians of absolute deviations from the medians were used（Me + 2 MAD）. The lower threshold level of the background concentration equal to the physiological need for an element is the median of 15% minimum values in the sampling minus the double median of absolute deviations from the median（Me15-2 MAD15）. The calculated ranges of the background concentrations of metals in algae were compared with concentrations of elements in macrophytes collected from habitats with background concentrations of metals in water.

关键词： Heavy Metals Background Concentrations of Metals threshold level Algae Costaria costata Biomonitoring Northwest Sea of Japan

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