Please specify the delimitation and the most representative input, state and output variables of the following systems: (a) the natural gas transportation pipe, between the extraction site and an...

Please specify the delimitation and the most representative input, state and output variables of the following systems:

(a) the natural gas transportation pipe, between the extraction site and an industrial user, investigated for the purpose of natural gas pressure loss reduction;

(b) the air conditioning (heating and cooling) of a concert hall, investigated for the purpose of minimizing the energy consumption by temperature optimization;

(c) the cell of a bacteria, investigated for the purpose of enhancing its living conditions and increasing its lifetime;

(d) the operating personnel of the offshore oil-gas platform, investigated for the purpose of maximizing their contribution to the efficient and safe operation of the unit;

(e) the market of sulfuric acid consumers, investigated for the purpose of improving the management of the production in an industrial plant.