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hi friends: is there any one can help me and give the equation i must used to calculate b.o.d in the waste water systems ? thank u in advanse for any help best regards.

hi friends what is the equation i must used to estimate ductwork and insulation by square feet method ? any articles will be gratefull thanks for all

hi friends: what is mean time to failure? best regards

hi friends: what is mean man.hours unit? i read it to much but i confuse it mean the time need to execute the job ? if i need more one labour to execute the job how can adjust the number of man .hours units? any articles will be gratefull.

hi friends is there any good book ,web site explain the differnt methods to distinguish between materials and alloys by chemical testing ? best regards

hi friends: how can design ventilation system for garage ? any suggestion ,articles will be gratefull best regards.

hi friends: what data i must collect to any process equipment and what is method to convert it to (time to failure )to begin do statistical analysis ? according my information i must do either probability or hazard analysis depend on my data if it is complete or multible censored data but...