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chemistry (ratio of activation energy to thermal energy) [1] Atomic weight: M: chemistry (mass of one atom divided by the atomic mass constant, 1 Da) Bodenstein number: Bo or Bd = / = chemistry (residence-time distribution; similar to the axial mass transfer Peclet number) [2]
For example, a 2017 op-ed in Nature [11] argued for formalizing the radian as a physical unit. The idea was rebutted [ 12 ] on the grounds that such a change would raise inconsistencies for both established dimensionless groups, like the Strouhal number , and for mathematically distinct entities that happen to have the same units, like torque ...
One important use is in the analysis of control systems. One of the simplest characteristic units is the doubling time of a system experiencing exponential growth , or conversely the half-life of a system experiencing exponential decay ; a more natural pair of characteristic units is mean age/ mean lifetime , which correspond to base e rather ...
Dimensionless numbers (or characteristic numbers) have an important role in analyzing the behavior of fluids and their flow as well as in other transport phenomena. [1] They include the Reynolds and the Mach numbers, which describe as ratios the relative magnitude of fluid and physical system characteristics, such as density, viscosity, speed of sound, and flow speed.
From January 2011 to December 2012, if you bought shares in companies when Randall J. Weisenburger joined the board, and sold them when he left, you would have a 43.7 percent return on your investment, compared to a 12.1 percent return from the S&P 500.
From January 2008 to December 2012, if you bought shares in companies when Charles D. Powell joined the board, and sold them when he left, you would have a 23.5 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
Most notably, in a 1929 paper he set out an argument based on the Pauli exclusion principle and the Dirac equation that fixed the value of the reciprocal of the fine-structure constant as 𝛼 −1 = 16 + 1 / 2 × 16 × (16–1) = 136. When its value was discovered to be closer to 137, he changed his argument to match that value.
Italy’s former national carrier Alitalia has started procedures for the collective dismissal of its remaining 2,059 employees, its administrators told unions. The move comes as the successor to ...