This article attempts to clarify certain misunderstandings about productive/unproductive labour (PUPL) concerning the “service economy.” The concept of service is embedded in discussion PUPL. After examining Smith’s and Marx’s definitions “service” labour,” we demonstrate that criticisms connotation literature are based on a misinterpretation classical definition term not consistent with post-i...

for large and complex reacting systems, computational efficiency becomes a critical issue in process simulation, optimization and model-based control. mechanism simplification is often a necessity to improve computational speed. we present a novel approach to simplification of reaction networks that formulates the model reduction problem as an optimization problem and solves it using genetic al...