No, you can't have it all.
ABSTRACT 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.
SourceAvailable from: Antonio Calvo Hernández[Show abstract] [Hide abstract]
ABSTRACT: Full analytical models of heat engines and refrigerators in linear irreversible thermodynamics can be defined by means of a chain of coupled heat devices. In this way it is possible to derive results and techniques of finite-time thermodynamics, like endoreversible efficiencies and the usual models of irreversible heat devices, in terms of an endoreversible energy converter plus a heat leak between external reservoirs. Also, a counterintuitive relationship is found between the global behavior of the chain and the individual performance of the devices: it is not necessary nor generally possible to impose the same operation regime on every device to achieve a desired overall performance.Physical Review E 04/2008; 77(4):041127. DOI:10.1103/PhysRevE.77.041127 · 2.33 Impact Factor
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ABSTRACT: Classical models of the Sun suggest that the energy output in the early stage of its evolution was 30 percent less than today. In this context, radiative balance alone between The Sun and the Earth was not sufficient to explain the early presence of liquid water on Earth’s surface. This difficulty is called the faint young Sun paradox. Many proposals have been published to solve this paradox. In the present work, we propose an oversimplified finite-time thermodynamic approach that describes the air convective cells in the Earth atmosphere. This model introduces two atmospheric modes of thermodynamic performance: a first mode consisting in the maximization of the power output of the convective cells (maximum power regime) and a second mode that consists in maximizing a functional representing a good trade-off between power output and entropy production (the ecological regime). Within the assumptions of this oversimplified model, we present different scenarios of albedo and greenhouse effects that seem realistic to preserve liquid water on the Earth in the early stage of formation.Advances in Astronomy 01/2012; 2012. DOI:10.1155/2012/478957 · 1.23 Impact Factor
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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 · 2.33 Impact Factor