试音室建筑声学缺陷查找及音质改造工程案例分析

对某试音室进行建筑声学测试、体验,对存在的颤动回声、低频共振等建筑声学缺陷及问题进行分析,在此基础上,根据试音室的功能使用需求,提出建筑声学音质改造方案,以此为例阐明了建筑声学缺陷的查找和修正方法。     

沥青混凝土干燥搅拌窑黑烟及粉尘污染防治措施研究

通过增设燃烧室、改进燃油喷嘴形式、烟气除尘方式 ,改变了燃烧状况 ,彻底解决了不完全燃烧现象 ,解决了冒黑烟及粉尘超标的问题     

UASB反应器中加入惰性载体促进颗粒污泥生成

使用一个反应容积为2551的UASB反应器处理啤酒生产废水,向接种絮状污泥中加入惰性载体,间歇进料7天内出现颗粒污泥、4周内形成稳定颗粒污泥床,COD去除率为90％。试验温度为16～33℃。对颗粒污泥形成机理进行了讨论。     

会议室装饰后空气中甲苯含量的变化

作者用活性炭吸附和高效液相色谱法,测定了某会议室装饰后空气中气态有机化合物的含量,发现甲苯含量高达30mg/m~3。跟踪监测的结果表明,45天后,浓度下降为0.8mg/m~3;90天后,恢复为0.10mg/m~3。甲苯浓度变化符合公式:C_t=C_0·E~(-nt)。     

化学物质对室内空气的污染(续前)

随着国内人民生活水平的提高，百姓对居室内装修标准的要求越来越高。装修材料含有一定的有害化学物质，可使室内不同程度地受其污染，直接影响居民的身体健康，这已引起各发达国家和国内有关部门的重视。文章主要就室内化学物质的来源、种类、污染现状和对人体健康的影响作了简要概述，同时还介绍了室内空气中化学物质的简易测试方法。     

室内装饰装修材料测试舱的研制与应用

介绍了测试舱的研制意义、测试舱构造和温度控制部分,以及空气交换、循环控制,空气净化装置和温度、湿度、流速显示装置等.通过实验,对测试舱的温度控制,空气净化系统检验,空气交换、循环的检验,释放甲醛平衡点的快速判断和测试舱的比对等运行技术指标进行了论证、优化.结果表明,简易的室内装饰装修材料测试舱对主要运行参数可以自动运行与控制,运行情况满足国家标准方法的技术指标要求,与同类商品化测试舱相比,误差在2%左右.     

A new coal pillars design method in order to enhance safety of the retreat mining in room and pillar mines

Most of the proposed methods for coal pillar design determine pillar dimensions using pillar load estimation only through the tributary area theory. Designing pillar based on these methods is not appropriate in room and pillar mines with pillar recovery because retreat mining and gob creation generate abutment loads. Neglecting abutment loads in design stage may lead to pillar failure and destructive effects during retreat mining. Thus proper pillar design has a remarkable effect on mining safety. In this paper, a step-by-step method is presented to design pillars with square shape in room and pillar mines with regard to existing pillars in the active mining zone (AMZ) and estimating abutment loads according to experimental equations. A decrease in pillar failure risk during retreat mining is the most significant benefit of this method. This method has been applied to determine optimum pillar dimensions in the main panel of Tabas Central Mine (TCM), located in the mid-eastern part of Iran. Obtained results show the abutment loads account for 27% of the total loads applied on pillars in AMZ in this panel. Pillar width, based on this method, is also obtained 11.6 m.