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The present paper starts from a model with distributed parameters (i.e. described by hyperbolic partial differential equations with non-standard (derivative) boundary conditions) of a hydroelectric power plant with tunnel, surge tank and penstock. The association of a system of functional differential equations of neutral type and the one-to-one correspondence between the solutions of the two mathematical objects is given. Further, it is given the deduction - via singular pertur-bations - of the nonlinear ordinary differential equations for modeling the surge tank in order to discuss its stability under constant power delivery of the hydraulic turbine. Some other unsolved problems are pointed out. [ABSTRACT FROM AUTHOR]

This volume is dedicated to the 70th anniversary of Vasile Drăgan, an internationally recognized researcher in the area of system and control theory. The impressive scientific results of Vasile Dragan are the output of a life-time sustained work and his special talent for Mathematics. This is a story of "A Beautiful Mind". On this occasion, his collaborators and his colleagues wish him long life in good health and happiness, and more achievements in the field of science. [ABSTRACT FROM AUTHOR]