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  2. Twisted nematic field effect - Wikipedia

    en.wikipedia.org/wiki/Twisted_nematic_field_effect

    OFF state. In the OFF state, i.e., when no electrical field is applied, the nematic liquid crystal molecules form a twisted configuration (aka helical structure or helix) between the two glass plates, G in the figure, which are separated by several spacers and coated with transparent electrodes, E 1 and E 2. The electrodes themselves are coated ...

  3. Control theory - Wikipedia

    en.wikipedia.org/wiki/Control_theory

    The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the boiler, which does not give closed-loop control of the temperature. In closed loop control, the control action from the controller is dependent on the process output.

  4. Open-loop controller - Wikipedia

    en.wikipedia.org/wiki/Open-loop_controller

    The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the boiler, which does not give closed-loop control of the temperature. In closed loop control, the control action from the controller is dependent on the process output.

  5. Control system - Wikipedia

    en.wikipedia.org/wiki/Control_system

    The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the boiler, which does not give closed-loop control of the temperature. In closed loop control, the control action from the controller is dependent on the process output.

  6. Control loop - Wikipedia

    en.wikipedia.org/wiki/Control_loop

    The control action is the switching on or off of the boiler. The process variable is the building temperature. This controller operates the heating system for a constant time regardless of the temperature of the building. In a closed-loop control system, the control action from the controller is dependent on the desired and actual process variable.

  7. Closed-loop controller - Wikipedia

    en.wikipedia.org/wiki/Closed-loop_controller

    The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the boiler, which does not give closed-loop control of the temperature. In closed loop control, the control action from the controller is dependent on the process output.

  8. Live coverage: Senate sends bill to avert shutdown to Biden’s ...

    www.aol.com/live-coverage-shutdown-looms-johnson...

    House Republicans are scrambling to find a way to avoid a government shutdown after their second funding proposal was rejected, and are now planning to vote on a third proposal soon.

  9. Automation - Wikipedia

    en.wikipedia.org/wiki/Automation

    The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the boiler, which does not give closed-loop control of the temperature. In closed loop control, the control action from the controller is dependent on the process output.