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Topic: Vickers hardness test

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In the News (Mon 18 Feb 19)

An operational definition is the description of a variable in terms of the specific process or set of validation tests used to manipulate it.
It has been said (slightly imprecisely, except as noted using the parenthetical additions), that the operational definition of a (nonspecific physical) cake (of a 'specific type') is the recipe for making the cake, which we may regard as a (nonspecific) physical object preparation process.
Operational definitions are at their most controversial in the field of psychology where intuitive concepts, such as intelligence need to be operationally defined before they become amenable to scientific investigation, for example, through processes such as IQ tests.
www.brainyencyclopedia.com /encyclopedia/o/op/operational_definition.html   (2193 words)

 Gold - Wikipedia, the free encyclopedia
Although this is certainly not a professional way of examining gold, the bite test should score the gold because gold is considered a soft metal according to the Mohs' scale of mineral hardness.
Economic gold extraction can be achieved from ore grades as little as 0.5 g/1000 kg (0.5 ppm) on average in large easily mined deposits, typical ore grades in open-pit mines are 1–5 g/1000 kg (1-5 ppm), ore grades in underground or hard rock mines are usually at least 3 g/1000 kg (3 ppm) on average.
For a long period, the United States government set the value of the US dollar so that one troy ounce was equal to $20.67 ($664.56/kg), but in 1934 the dollar was revalued to $35.00 per troy ounce ($1125.27/kg).
en.wikipedia.org /wiki/Gold   (3723 words)

 Brinell Hardness Budget Machines Brinell testing hardness Budget equipment hardness testing portable Microscopes
Contact Us If you need the highest quality Brinell Hardness Testers from a UKAS Accredited organization but do not yet wish to invest in an automated system, Foundrax can offer a number of hardness testers to suit your budget.
BRINtronic-LT The Foundrax Model 134 portable Brinell Hardness Tester will cover over 90% of all portable Brinell hardness testing applications, serving the established market for full load (29 420N – 3000kgf) tests.
BRIN200 Series of hardness testers, is a production Brinell hardness tester with micrometer measurement of indentation diameter on built-in screen for easier and more accurate results.
www.foundrax.co.uk /pages/budget_machines.html   (457 words)

 Martindale's Calculators On-Line Center: Part I:F-H - Construction & Repair: K-Q
Hardness Calculators include : "...Vickers Hardness Test; Various Brinell Hardness Tests; Knoop Hardness Test; Mohs Hardness Test; Various Rockwell Hardness Tests; etc..." For more information see Calculators or Engineering Fundamentals
HARDNESS TESTING CALCULATORS - G. England, Independent Metallurgist and Consultant to the Thermal Spray Coating Industry, Surrey, England VERY EXTENSIVE.
www.martindalecenter.com /Calculators1A_5_Co_KQ.html   (3211 words)

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