Chemical Engineering Basics
In radiative heat transfer, a grey surface is the one, which has

Equal brightness in all directions
Emissivity independent of wavelength
Zero reflectivity
Grey appearance to the eye

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Chemical Engineering Basics
Maraging steels derive their strength from the following mechanism:

Fine dispersions of Fe₃ C nucleated on dislocations in austenite
A fine, highly dislocated and strong martensite
Fine dispersions of alloy carbides in a ferrite matrix
Fine dispersions of intermetallics of Fe, Ni, Ti etc

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Chemical Engineering Basics
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

Mortgaging the obsolete machine/property
Writing off the obsolete machine/ property
Disposing off machine/property, which is no longer useful in the present scenerio
Disposing off a machine/property on as is where is basis

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