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  2. File:DMF open and closed system.pdf - Wikipedia

    en.wikipedia.org/wiki/File:DMF_open_and_closed...

    English: Open and Closed Digital Microfluidic Systems: Applied voltage to an adjacent electrode creates an interfacial tension gradient that causes an aqueous droplet to move towards the charged electrode. Each electrode is controlled individually via a control pin that manipulates when voltage is applied.

  3. Thermodynamic system - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_system

    Properties of isolated, closed, and open thermodynamic systems in exchanging energy and matter. A thermodynamic system is a body of matter and/or radiation separate from its surroundings that can be studied using the laws of thermodynamics.

  4. 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 ...

  5. Systems theory in anthropology - Wikipedia

    en.wikipedia.org/wiki/Systems_theory_in_anthropology

    The open systems are systems that allow interactions between its internal elements and the environment. An open system is defined as a "system in exchange of matter with its environment, presenting import and export, building-up and breaking-down of its material components." [4] For example, living organism. Closed systems, on the other hand ...

  6. Open system (systems theory) - Wikipedia

    en.wikipedia.org/wiki/Open_system_(systems_theory)

    In the social sciences an open system is a process that exchanges material, energy, people, capital and information with its environment. French/Greek philosopher Kostas Axelos argued that seeing the "world system" as inherently open (though unified) would solve many of the problems in the social sciences, including that of praxis (the relation of knowledge to practice), so that various social ...

  7. Closed system - Wikipedia

    en.wikipedia.org/wiki/Closed_system

    Properties of isolated, closed, and open systems in exchanging energy and matter. In thermodynamics, a closed system can exchange energy (as heat or work) but not matter, with its surroundings. An isolated system cannot exchange any heat, work, or matter with the surroundings, while an open system can exchange energy and matter.

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  9. Feed forward (control) - Wikipedia

    en.wikipedia.org/wiki/Feed_forward_(control)

    In systems theory, an open system is a feed forward system that does not have any feedback loop to control its output. In contrast, a closed system uses on a feedback loop to control the operation of the system. In an open system, the output of the system is not fed back into the input to the system for control or operation. [citation needed]