ASTM E1414/E1414M-11ae1由美国材料与试验协会 US-ASTM 发布于 2011。
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5.1 Modern offices and other multipurpose buildings commonly have suspended acoustical ceilings installed over room dividing partitions. The test facility prescribed in this test method is useful for providing ceiling attenuation data on the relevant ceiling/partition elements and systems, to ensure that the transmission of sound through the ceiling and plenum space, or through the combination of ceiling, plenum space, and partition systems, provides a suitable degree of acoustical isolation.
5.2 This test method is useful for rating and specifying, under standardized conditions, the sound attenuation performance of ceiling materials when mounted in a specified suspension system.
5.3 This test method may be useful for selecting a wall-ceiling system for probable compliance with a performance specification for overall sound isolation between rooms. However, the actual field performance may differ significantly, particularly if the field plenum depth is not within the limits specified in this test method or if the plenum space contains large ducts, beams, etc., or both. (See Test Method E336.)
5.4 The flexibility inherent in the test facility enables evaluation of the effects of penetrations, induced leakage paths, luminaire, and air diffuser installations and discontinuities in the ceiling suspension system at the partition line, including penetration of the partition into the ceiling plenum. The effect of installing plenum barriers at the partition line may also be investigated.
5.5 With the concentration of sound absorbent area offered by a suspended sound absorbent ceiling installed in a room, it is not possible to obtain a good approximation to a diffuse sound field in that room. The plenum dimensions prevent the maintenance of a diffuse sound field above the test specimen. These factors affect the values of the measured ceiling sound attenuation and thus the measurements are not a fundamental property of the ceiling. The test method measures the acoustical properties attainable under the prescribed test conditions, which have been arbitrarily selected. The conditions must be adhered to in every test facility so that the measured results will be consistent. Two methods for obtaining A, the receiving room absorption, are given without preference. One method, known as the steady state method, has been used to obtain an estimate for A in the AMA 1-II-1967 standard. The other method follows the procedures used in Test Methods E90 and C423; justification for the use of this method may be found in reference (1)5. Persons wishing to further investigate the limitations imposed by this test method are advised to read references (2), (3), (4) and
用于吸附气态物质时应选择粒状活性炭,其四氯化碳的活性应高于60%。(4)通风柜内做标记实验时,排风口应设除碘过滤装置。 (5)通风柜做含汞实验时,排风口应设高锰酸钾和次氯酸钠溶液吸收装置或载硫活性炭吸附后排放。2.2.3通风柜与房间共用排风系统的特点是: (1)通过位移传感器直接控制变频器,风管内不装传感器,避免了传感器被腐蚀和污染,在较低成本下实现变风量控制。...
3、天花板上面的间隙空间往往是很大的,所以它完全可以用来安置管道系统、机械和电力设备(管道系统),如果这些系统并不需要占用窗户上部空间的话,那么楼板与楼板之间的空间就是一个独一无二的可以高效利用自然光的空间,因为自然光通过窗口的高度有多高,它就能达到房间多大的进深。不同的实验室对人工光和自然光的需求不同变化很大。在有些实验室里,室外景观才是研究人员最想获得的,而不是自然光。...
使用各种高压储气瓶时,应使用铁环等固定器材将其稳固在支架或墙壁上,防止因触碰而翻到。5 留有余地考虑到今后实验室拓展检测/校准项目的需要,实验室的供电容量应留有余地;除常用的220V供电电源以外,还应考虑380V的电源供电;由于灯的效率和房间墙面反射率不断衰减,设计照度应大于标准照度等。...
使用各种高压储气瓶时,应使用铁环等固定器材将其稳固在支架或墙壁上,防止因触碰而翻到。(5)留有余地考虑到今后实验室拓展检测/校准项目的需要,实验室的供电容量应留有余地;除常用的220V供电电源以外,还应考虑380V的电源供电;由于灯的效率和房间墙面反射率不断衰减,设计照度应大于标准照度等。...
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