共查询到19条相似文献,搜索用时 46 毫秒
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通过一起噪声扰民监测案例,叙述了《工业企业厂界噪声》和《建筑施工场界噪声》的内涵与特征,针对特定的噪声污染现状,提出更加合理的监测方案,有助于解决噪声扰民的信访案件。 相似文献
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就徐州市实施《城市区域环境噪声标准》的实际经验,得出了“城市基础建设的现代化和开发,加上适配的管理对策,是控制城市环境噪声的完整对策”的结论。对特殊噪声源的测点选择以及有关的几个国家标准提出了质疑,并提出了意见或建议。 相似文献
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选择主要铁路干线经过的具有代表性的大中型城市,通过大量的铁路噪声监测数据的统计分析和理论计算,研究铁路噪声特点及其传播过程中的衰减规律;确定铁路两侧过渡带区域范围,提出过渡带区域噪声环境标准,指导环保部门对铁路两侧区域的环境管理和功能区的合理设置。 相似文献
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为了验证列车通过的等效声级、等效时间及预测模式的正确性,选择了一个开阔的场所,在距离铁路外轨中心线30 m处采用两种不同的方式记录列车通过时的源强及持续时间,然后利用监测值预测60 m处的1h等效连续A声级,并与60 m处的1h等效连续A声级监测值进行对比.结果表明,列车经过身边到离开时的持续时间作为等效时间,经过身边时的最大噪声级作为源强,所得到的预测值与监测值的误差范围在-0.3~0.9 dB(A),方差为0.229,离散度较小,预测值与监测值较吻合,可用于指导设计与规划工作.同时,在分析误差产生原因的基础上,提出了提高预测准确性的建议. 相似文献
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简要介绍了邳州市城区环境噪声区域划分情况,分析了噪声污染的来源,通过对监测结果的分析统计,提出了控制噪声污染的对策意见。 相似文献
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介绍了侧联式球磨机噪声产生原理及其噪声控制方法,选择了制作局部式隔声罩的噪声控制设计和装置结构。在中国铝业中州分公司热电厂球磨机上应用,取得了很好的隔声效果。 相似文献
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J. W. Suttie 《Journal of the Air & Waste Management Association (1995)》2013,63(4):239-242
The ingestion of forages contaminated with inorganic fluorides from industrial sources constitutes an air pollution problem for domestic livestock. In cattle, which have been studied most extensively, the syndrome is characterized by dental and skeletal lesions, lameness, chemical evidence of increased fluoride ingestion, and in severe cases by effects on appetite and milk production. The only practical basis for a standard appears to be one based on forage fluoride concentrations. It is concluded that a standard should protect cattle from loss of milk production and from severe dental fluorosis, but need not be set so low that the animals will be protected against any discernible deviations from normal which do not influence their general health, productive ability, or the soundness and wearing quality of their dentition. As there may be wide seasonal variations in forage fluoride concentrations, the basic standard should be expressed as a yearly average of the forage fluoride concentration. However, as the developing teeth may be adversely influenced by short periods of high exposure, the standard should contain a provision which limits both the extent and duration of time that high concentrations may be tolerated even though they are balanced by lower values at other months. Based on these criteria, a tentative standard which limits forage fluoride to an average of 40 ppm, and limits the time that forage concentrations may exceed 60 or 80 ppm F is proposed. 相似文献
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