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The "diamonds" are actually a complex flow field made visible by abrupt changes in local density and pressure as the exhaust passes through a series of standing shock waves and expansion fans. The physicist Ernst Mach was the first to describe a strong shock normal to the direction of fluid flow, the presence of which causes the diamond pattern.
At such speeds, shock waves form in the air passing over the wings, drastically increasing the drag due to drag divergence, causing Mach buffet, or drastically changing the center of pressure, resulting in a nose-down moment called "mach tuck". The aircraft Mach number at which these effects appear is known as its critical Mach number, or M ...
A large quantity of sample (between 2 and 5 kg) is digested or leached with cold sodium cyanide (NaCN) solution (generally 0.1% NaCN), for one to several days (depending on the assay laboratory involved). The gold is dissolved through its formation of a cyanide complex, which is concentrated through the solvent exchange process into an organic ...
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Very few assets spark debates as controversial as those over gold. Some investors, notably Warren Buffett, say it's just a shiny metal that doesn't yield any cash flows. Others argue that it's the ...
Mach's work has also been cited as an influence on the Vienna Circle, being described as a "major precursor of logical positivism". [30] Members of the Circle organized the "Ernst Mach Society" as a vehicle for discussion of their ideas. [31] Mach's work was a "forerunner" of Gestalt psychology. [32]
Berkshire Hathaway is facing a massive tax bill after this historic sale.
Mach tuck occurred at speeds above Mach 0.65; [3] the air flow over the wing center section became transonic, causing a loss of lift. The resultant change in downwash at the tail caused a nose-down pitching moment and the dive to steepen (Mach tuck). The aircraft was very stable in this condition [3] making recovery from the dive very difficult.