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  2. Closed system - Wikipedia

    en.wikipedia.org/wiki/Closed_system

    A closed system is a natural physical system that does not allow transfer of matter in or out of the system, although – in the contexts of physics, chemistry, engineering, etc. – the transfer of energy (e.g. as work or heat) is allowed.

  3. Thermodynamic system - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_system

    The presence of reactants in an open beaker is an example of an open system. Here the boundary is an imaginary surface enclosing the beaker and reactants. It is named closed, if borders are impenetrable for substance, but allow transit of energy in the form of heat, and isolated, if there is no exchange of heat and substances. The open system ...

  4. Isolated system - Wikipedia

    en.wikipedia.org/wiki/Isolated_system

    Properties of Isolated, closed, and open systems in exchanging energy and matter. In physical science, an isolated system is either of the following: a physical system so far removed from other systems that it does not interact with them. a thermodynamic system enclosed by rigid immovable walls through which neither mass nor energy can pass.

  5. Closed ecological system - Wikipedia

    en.wikipedia.org/wiki/Closed_ecological_system

    Closed ecological systems or contained ecological systems (CES) are ecosystems that do not rely on matter exchange with any part outside the system. The term is most often used to describe small, man-made ecosystems. Such systems can potentially serve as a life-support system or space habitats. [1]

  6. Glossary of systems theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_systems_theory

    Homeostasis: The property of either an open system or a closed system (especially a living organism) which regulates its internal environment so as to maintain a stable, constant condition. Human activity systems: Designed social systems organized for a purpose, which they attain by carrying out specific functions.

  7. Second law of thermodynamics - Wikipedia

    en.wikipedia.org/wiki/Second_law_of_thermodynamics

    The second law of thermodynamics is a physical law based on universal empirical observation concerning heat and energy interconversions.A simple statement of the law is that heat always flows spontaneously from hotter to colder regions of matter (or 'downhill' in terms of the temperature gradient).

  8. Mesocosm - Wikipedia

    en.wikipedia.org/wiki/Mesocosm

    Diagram of a small form closed system mesocosm. Different components of a successful mesocosm . A mesocosm (meso-or 'medium' and -cosm 'world') is any outdoor experimental system that examines the natural environment under controlled conditions. In this way mesocosm studies provide a link between field surveys and highly controlled laboratory ...

  9. Closed system (control theory) - Wikipedia

    en.wikipedia.org/wiki/Closed_system_(control_theory)

    The terms closed system and open system have long been defined in the widely (and long before any sort of amplifier was invented) established subject of thermodynamics, in terms that have nothing to do with the concepts of feedback and feedforward. The terms 'feedforward' and 'feedback' arose first in the 1920s in the theory of amplifier design ...

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