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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Thermoregulation01:26

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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Related Experiment Video

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Deformable frequency selective surface structure with tuning capability through thermoregulating.

Xin Chen, Jinsong Gao, Chunyi Fang

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    |July 21, 2015
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    Summary
    This summary is machine-generated.

    This study introduces a deformable frequency selective surface (FSS) using shape memory alloys (SMA). The FSS demonstrates a wide tunable frequency range, making it suitable for advanced filter applications.

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    Area of Science:

    • Materials Science
    • Electrical Engineering
    • Electromagnetics

    Background:

    • Frequency selective surfaces (FSS) are crucial for filtering electromagnetic waves.
    • Existing FSS designs often lack tunability or possess limited tuning ranges.
    • The integration of smart materials offers potential for novel FSS functionalities.

    Purpose of the Study:

    • To design and fabricate a deformable FSS using shape memory alloys (SMA).
    • To investigate the tunable characteristics of the SMA-based FSS.
    • To evaluate its performance for tunable filter applications.

    Main Methods:

    • Fabrication of a deformable FSS unit cell utilizing SMA.
    • Utilizing the shape-memory effect of SMA for alternating geometrical configurations upon heating and cooling.
    • Employing equivalent circuit modeling and numerical calculations for transmission analysis.
    • Experimental measurements to validate performance and determine the tuning range.

    Main Results:

    • The deformable FSS unit cell exhibits two distinct shapes, switching between them during thermal cycles.
    • This shape change induces a significant drift in the resonant frequency.
    • A wide tuning range from 13.07 GHz to 16.29 GHz was experimentally achieved.
    • The device demonstrated sharp cut-off characteristics.

    Conclusions:

    • The developed SMA-based deformable FSS offers a wide tunable frequency range.
    • The design presents an attractive solution for tunable filters across various frequency bands.
    • The combination of SMA and FSS technology enables advanced electromagnetic filtering capabilities.