Replacement analysis

Most of the errors in replacement studies are caused by failure to realize that a replacement analysis must be based on conditions existing at the present time. Some persons insist on trying to compensate for past mistakes by forcing new ventures to pay off losses incurred in the past. Instead, these losses should be accepted, and the new venture should be considered on its own merit. 

Boiling liquids, heat-transfer coefficients for, 597 Bonds, interest rate on, 248-249 Book value definition of 277 in replacement analysis, 332 Box-Wilson design, 766, 769 Break-even chart, 155-156... 

For more recent synthetic polymers, interviews with the artist can provide information about materiak and technique used, although they do not always replace analysis. The date of manufacture or, if unavailable, the date of collection, can provide a starting point in the identification of plastics. If a plastic was manufactured before around 1905, it is likely to be a semi-synthetic or natural material, rather than a fully synthetic plastic. The period between 1939 and 1960 saw a dramatic increase in production of polystyrene, poly (vinyl chloride), nylon, acrylics and polyethylene and the phasing out of semi-synthetics. If a plastic was manufactured before the 1940s, it could not have been shaped by injection moulding, recognized by a small imperfection due to the filling hole. 

Testing is restricted largely to tests of the final product in an environment which is as close as possible to the operational environment. Its purpose, broadly, is to demonstrate that what has been built satisfies the requirements, and it is used to supplement (sometimes replace) Analysis. 

McAfee PC, Geisler FH, Saiedy SS, Moore SV, Regan JJ, Guyer RD, et al. Revisability of the CHARITE artificial disc replacement analysis of 688 patients enrolled in the U.S. IDE study of the CHARITE artificial disc. Spine 2006 May 15 31(ll) 1217-26. 

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