Knowledge in Composition

Material Chemistry-refractories, cement,lubricants

This PDF contain information about material chemistry.It includes composite of different types of cement,lubricants and its types,refractories and their properties,types.All this information is very much helpful to students for their semester end exams.

The Open Systems Interconnection model (OSI model)

This file contains all about The Open Systems Interconnection model (OSI model). It's principles, features, functions of different layers, etc.