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The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...
Other categorizations have been proposed. For example, Mosteller and Tukey (1977) [22] distinguished grades, ranks, counted fractions, counts, amounts, and balances. Nelder (1990) [23] described continuous counts, continuous ratios, count ratios, and categorical modes of data
Define the "reverse time" variable z = T − t.(t = 0, z = T and t = T, z = 0).Then: Plotted on a time axis normalized to system time constant (τ = 1/r years and τ = RC seconds respectively) the mortgage balance function in a CRM (green) is a mirror image of the step response curve for an RC circuit (blue).The vertical axis is normalized to system asymptote i.e. perpetuity value M a /r for ...
Attenuation is governed by the Beer-Lambert Law, namely that the transmittance or fraction of insolation reaching the surface decreases exponentially in the optical depth or absorbance (the two notions differing only by a constant factor of ln(10) = 2.303) of the path of insolation through the atmosphere. For any given short length of the path ...
BAC is generally defined as a fraction of weight of alcohol per volume of blood, with an SI coherent derived unit of kg/m 3 or equivalently grams per liter (g/L). Countries differ in how this quantity is normally expressed.
The solar energy to electrical power conversion efficiency is the product of several factors: the fraction of solar energy captured (accounting for optical losses in the solar concentration system), the heating efficiency (accounting for thermal losses in the element receiving the solar energy), and the thermal conversion efficiency (the ...
Wow and flutter are particularly audible on music with oboe, string, guitar, flute, brass, or piano solo playing. While wow is perceived clearly as pitch variation, flutter can alter the sound of the music differently, making it sound ‘cracked’ or ‘ugly’.
A photon rocket is a rocket that uses thrust from the momentum of emitted photons (radiation pressure by emission) for its propulsion. [1] Photon rockets have been discussed as a propulsion system that could make interstellar flight possible during a human lifetime, which requires the ability to propel spacecraft to speeds at least 10% of the speed of light, v ≈ 0.1c = 30,000 km/s. [2]