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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

biological networks --- Species identification --- Metabolic reactions --- transmission --- Mutualistic symbiosis --- Systemic resistance --- agricultural management

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Botany & plant sciences --- biological networks --- Species identification --- Metabolic reactions --- transmission --- Mutualistic symbiosis --- Systemic resistance --- agricultural management

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This second Special Issue connects both the fundamental and application aspects of thermomechanical machines and processes. Among them, engines have the largest place (Diesel, Lenoir, Brayton, Stirling), even if their environmental aspects are questionable for the future. Mechanical and chemical processes as well as quantum processes that could be important in the near future are considered from a thermodynamical point of view as well as for applications and their relevance to quantum thermodynamics. New insights are reported regarding more classical approaches: Finite Time Thermodynamics F.T.T.; Finite Speed thermodynamics F.S.T.; Finite Dimensions Optimal Thermodynamics F.D.O.T. The evolution of the research resulting from this second Special Issue ranges from basic cycles to complex systems and the development of various new branches of thermodynamics.

Research & information: general --- combined cycle --- inverse Brayton cycle --- regenerative Brayton cycle --- power output --- thermal efficiency --- finite time thermodynamics --- closed simple Brayton cycle --- power density --- ecological function --- multi-objective optimization --- quantum thermodynamics --- quantum circuit --- open quantum system --- isothermal process --- IBM quantum computer --- Stirling refrigerator --- thermodynamic analysis --- numerical model --- imperfect regeneration --- irreversible Lenoir cycle --- cycle power --- heat conductance distribution --- performance optimization --- irreversible Carnot engine --- optimization --- thermodynamics with finite speed --- internal and external irreversibilities --- entropy generation calculation --- thermodynamics in finite time --- irreversible Diesel cycle --- Carnot cycle --- Carnot efficiency --- thermal entropy --- chemical entropy --- mechanical entropy --- thermal exergy --- chemical exergy --- mechanical exergy --- metabolic reactions --- Carnot engine --- Chambadal model --- entropy production action --- efficiency at maximum power