Many of us are struggling to chart a path toward success in our careers and a sense of fulfillment in all aspects of our lives. But we can't excel simultaneously in every role. Instead, at various points in life we must choose what to emphasize and what to relinquish. The goal is to make that decision consciously instead of unwittingly Letting go of the most important item. The author presents a framework he designed with Howard Stevenson, a business professor who has played many roles throughout his life, to help ambitious executives understand their limits and make tough trade-offs. It starts with considering all the dimensions of your life, developing a vision of yourself for the present and for the future, and then evaluating how your options advance you toward your goals. where do your options fall on the needs-wants spectrum? Most things fall somewhere in the middle. Some wants are so strong that it's difficult to separate them from needs. What are the investment and opportunity costs? Most decisions involve both kinds of costs. The challenge is to understand if incurring them will help you achieve your goals. Are the potential benefits worth the costs? Does the benefit you'll receive warrant the investment you'll have to make? Can you make a trade? Many of us try to exchange something we have for something else that we want. But sometimes the two items can't be traded. Money, for instance, cannot buy health. Have you considered sequencing your most valued options? Consciously staggering your goals may enable you to be equally successful in many dimensions over time.
[Show abstract][Hide abstract] ABSTRACT: We analyze work and efficiency for an adiabatic rocking ratchet working under three operating regimes: maximum efficiency, maximum work, and a third one which represents a compromise between them. For all of these regimes the application of very concrete loads and external amplitudes is found necessary in order to obtain the maximum possible values of both efficiency and work. The reported results could be valuable to design efficient Brownian motors and compare their operation under different working regimes.
Physical Review E 11/2003; 68(4):046125. DOI:10.1103/PhysRevE.68.046125 · 2.29 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The finite-time performance of a quantum-mechanical heat engine (or refrigerator) with a working fluid consisting of many noninteracting harmonic oscillators is considered in order to analyze three optimum operating regimes: maximum efficiency (maximum coefficient of performance), maximum work output (maximum cooling load) and a third one, Omega criterion, which represents a compromise between them. The reported results extend previous findings for macroscopic and mesoscopic energy converters to quantum heat devices and also endorse the Omega criterion as a unified, optimum working regime for energy converters, independent of their size and nature.
Physical Review E 11/2004; 70(4):046134. DOI:10.1103/PhysRevE.70.046134 · 2.29 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Arrays of coupled heat engines are proposed as a paradigmatic model to study the trade-off between individual and collective behavior in linear irreversible thermodynamics. The analysis reveals the existence of a control parameter which selects different operation regimes of the whole array. In particular, the regimes of maximum efficiency and maximum power are considered, giving for the latter a general derivation of the Curzon-Ahlborn efficiency which surprisingly does not depend on whether or not the individual engines in the array work at maximum power.
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