Search results
Results from the WOW.Com Content Network
Prior to the STC rating, the sound isolation performance of a partition was measured and reported as the average transmission loss of over the frequency range 128 to 4096 Hz or 256 to 1021 Hz. [ 8 ] [ 9 ] This method is valuable at comparing homogeneous partitions that follow the mass law, but can be misleading when comparing complex or multi ...
The SAA is a single-number rating of sound absorption properties of a material identical to NRC, except that twelve one-third octave measurements from 200 Hz to 2500 Hz are used, inclusive, instead of just four in a smaller range and rounding is to the nearest multiple of 0.01 instead of 0.05 due to improved repeatability from averaging more ...
The Janka hardness test results tabulated below followed ASTM D 1037-12 testing methods. Lumber stocks tested range from 1" to 2" (25–50 mm) thick. The tabulated Janka hardness numbers are an average. There is a standard deviation associated with each species, but these values are not given. [citation needed] No testing was done on actual ...
The longer it takes, the higher the viscosity and thus the higher the SAE code. Larger numbers are thicker. J300 specifies a viscosity range for each non-winter grade, with higher grade numbers corresponding to higher viscosities. In addition, a minimum viscosity measured at a high temperature and high-shear rate (HTHS, ASTM D4683) is also ...
Audio engineers use dynamic range to describe the ratio of the amplitude of the loudest possible undistorted signal to the noise floor, say of a microphone or loudspeaker. [18] Dynamic range is therefore the signal-to-noise ratio (SNR) for the case where the signal is the loudest possible for the system. For example, if the ceiling of a device ...
One test program, IIHS, makes a four level rating: Good, Acceptable, Marginal and Poor. [3] The differences between those various test programs include the range of tests and test configurations, the final rating computation, and the specification of models available in different markets. [4]
The length of time required for a penetrant or sample on average to exceed a specified average heat rise above ambient at any single location determines the duration for the FT Rating (Fire and Temperature). If a hose-stream test is passed afterwards, the rating can then be expressed as an FTH Rating (Fire, Temperature and Hose-stream). The ...
The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]