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In mechanics, a diaphragm is a sheet of a semi-flexible material anchored at its periphery and most often round in shape. It serves either as a barrier between two chambers, moving slightly up into one chamber or down into the other depending on differences in pressure , or as a device that vibrates when certain frequencies are applied to it.
In some cases the diaphragm and spring are also sealed from the environment. [11] [1]: 9–13 The diaphragm is a flexible cover to the interstage (intermediate) pressure chamber. When the diver consumes gas from the second stage, the pressure falls in the low pressure chamber and the diaphragm deforms inwards pushing against the valve lifter.
The song "Johnny Got a Zero" was released as sheet music in 1943, lyrics by Mack David and music by Vee Lawnhurst, and topped out at #4 on the Variety list for the week of April 28. [4] An a cappella rendition by The Song Spinners , "Johnny Zero", stayed on Billboard magazine's charts from June to August, peaking at #7. [ 4 ]
The Assistant Secretary of the Army (Installations, Energy and Environment) is the primary advisor to the Secretary of the Army and Chief of Staff, Army on all United States Army matters related to infrastructure, installation policy, oversight and coordination of energy security, environmental management, safety and occupational health.