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Related Concept Videos

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
Thermal Stress01:09

Thermal Stress

If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
Thermosensation01:43

Thermosensation

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...
Thermal Strain01:19

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
Mechanism of heat transfer01:19

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.

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Related Experiment Video

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Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
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Published on: June 17, 2020

Material identification using real and simulated thermal cues.

H Ho1, L A Jones

  • 1Dept. of Mech. Eng., Massachusetts Inst. of Technol., MA, USA.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 3, 2007
PubMed
Summary

This study developed a thermal display to simulate material thermal properties. Results show simulated materials provide similar identification performance as real ones, enhancing haptic feedback for object recognition.

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Area of Science:

  • Haptics and Human-Computer Interaction
  • Thermal Perception and Material Science

Background:

  • Simulating tactile sensations is crucial for immersive virtual experiences.
  • Accurate thermal feedback enhances the realism of human-computer interaction.
  • Existing methods often lack the fidelity to replicate diverse material thermal properties.

Purpose of the Study:

  • To develop and evaluate a novel thermal display.
  • To simulate thermal cues from materials with varying thermal properties.
  • To assess the effectiveness of simulated thermal feedback in object recognition tasks.

Main Methods:

  • A semi-infinite body model was used to design the thermal display.
  • A material identification experiment compared real and simulated materials.
  • Subject performance in identifying materials was quantitatively analyzed.
  • Skin temperature changes were measured and compared between conditions.

Main Results:

  • No significant difference in material identification accuracy was found between real and simulated materials.
  • Observed skin temperature decreases were comparable across real and simulated conditions.
  • Temperature changes correlated with the material's contact coefficient, validating the model.

Conclusions:

  • The developed thermal display effectively simulates material thermal properties.
  • Thermal feedback significantly aids object recognition, especially with limited visual information.
  • This technology advances haptic display capabilities for realistic material interaction.