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In baseball statistics, run average (RA) refers to measures of the rate at which runs are allowed or scored. For pitchers , the run average is the number of runs—earned or unearned—allowed per nine innings.
During the dead-ball era of the 1900s and 1910s, an ERA below 2.00 (two earned runs allowed per nine innings) was considered good. [1] In the late 1920s and through the 1930s, when conditions of the game changed in a way that strongly favored hitters, a good ERA was below 4.00; only the highest caliber pitchers, for example Dazzy Vance or Lefty ...
S m is the mean spacing between peaks. Just as with real mountains it is important to define a "peak". For S m the surface must have dipped below the mean surface before rising again to a new peak. The average wavelength a and the root mean square wavelength q are derived from a.
Route Availability (RA) is the system by which the permanent way and supporting works (bridges, embankments, etc.) of the railway network of Great Britain are graded. All routes are allocated an RA number between 1 and 10. Rolling stock is also allocated an RA (again between 1 and 10) and the RA of a train is the highest RA of any of its ...
Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals.
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The higher the CRI value, the smaller the differences between indices will be. A CRI value of 100 indicates the best performance of a light source, while a low CRI value may result in some colors looking unnatural. The most commonly used value of CRI is called Ra, which is the average value of the first eight indices (R1-R8).
In fluid mechanics, the Rayleigh number (Ra, after Lord Rayleigh [1]) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known as free (or natural) convection. [ 2 ] [ 3 ] [ 4 ] It characterises the fluid's flow regime: [ 5 ] a value in a certain lower range denotes laminar flow ; a value in a higher range ...