Mach

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Mach

Ernst . 1838--1916, Austrian physicist and philosopher. He devised the system of speed measurement using the Mach number. He also founded logical positivism, asserting that the validity of a scientific law is proved only after empirical testing
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Mach

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Speed of sound as a function of altitude.
Machclick for a larger image
Refers to a Mach number, or the ratio of the speed of an airplane to the speed of sound in the same atmospheric conditions. It is also used as a speed unit. The speed of sound, or Mach 1, is equal to 340.5 m/s, 661 knots, 761 miles per hour, or 1225.5 km/h at sea level under standard conditions, and it decreases with altitude. Above the tropopause (about 36,090 ft, or 11 km), Mach 1 is 295.5 m/s, 574 knots, 658 miles per hour, or 1063.2 km/h. Named after Ernst Mach (1838–1916).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

Mach

An operating system kernel under development at Carnegie-Mellon University to support distributed and parallel computation. Mach is designed to support computing environments consisting of networks of uniprocessors and multiprocessors. Mach is the kernel of the OSF/1.
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Mach kernel

A Unix-like operating system developed at Carnegie-Mellon University in the period between 1985 and 1994. The Mach kernel was designed with a microkernel architecture that makes it easily portable to different platforms. Operating systems based on Mach include NextStep, OSF/1 and macOS. See microkernel, macOS and Open Group.
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References in periodicals archive ?
where [beta]'s indicate standardized partial regression coefficients; "*" indicates multiplication; gender equals 1 for males and 0 for females; "Mach*Age" indicates the interaction of Mach and age scores.
Model 5 indicates a positive relationship occurs between Mach scores and sales success in the context of stockbrokers selling in a loosely structured organization.