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Powder Rolling: Also known as roll compaction , it is one of the method of production highdensity PM products. In this process, metal powders are fed between two rolling-mills rotating in opposite directions. The process is used for making sheet metal for electrical and electronic components and for coins. ( Fundamentals of Manufacturing Engineering - D.K. Singh-page 477)

Plastic Alloy: The principle o alloying plastics is similar to that of alloying metals- to achive in one material the advantages possessed by several others. The recent increased interest and activity in the field of polymer alloys has occured as a result of several new factors. One is the development of more sophisticated techniques for combining plastics which were previously considered to be incompatible. Another is the keen competition for a share of new market areas such as automobile bumpers, body panels etc. These applications call for combinations of properties not previously available in a single plastic and it has been found that it is less expensive to combine existing plastics than to develop a new monomer on which to base the new plastic. Typical plastic alloys : PVC/Acrylic, PVC/ABS, Polycarbonate /ABS, ABS/ Polysulphone, Nylon/elastomer. (Plastic Engineering - R.J. Crawford- page 11 )

Closed-loop transfer function: The closed-loop transfer function (CLTF) of any feedback control system can be determined by using a relatively straightforward process. We define R(s) as the input, C(s) as the output or control variable, G(s) as the forward path transfer function, H(s) as the feedback path transfer function, C(s) / R(s) as the Closed loop transfer function (CLTF), E(s) as the error signal, and B(s) as the feedback signal.G(s) includes all transfer functions and gains in the feedback path. ( Introduction to aircraft flight mechanics- Thomas R. Yechout, Steven L. Morris-page 399)

Mechanical Agitation: Mechanical agitation is necessary when you must add materials a portion at a time so that they have immediate intimate contact with the bulk of the solution. Efficient mechanical agitation reduce the time for completion of reaction, can be used to control rate of reaction, and improves yields of products. ( Chemical technicians' ready reference handbook - Greshon J. Shugar, Jack T. Ballinger, Linda M. Dawkins- page 229)