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Related Concept Videos

Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Contact-dependent Signaling01:19

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
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Shearing Stress01:19

Shearing Stress

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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Shear Diagram01:27

Shear Diagram

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In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
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Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Related Experiment Video

Updated: Jan 27, 2026

Assessment of Spatial Lingual Tactile Sensitivity using a Gratings Orientation Test
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Highly Sensitive Tactile Shear Sensor Using Spatially Digitized Contact Electrodes.

Eunsuk Choi1, Soonhyung Hwang2, Yousang Yoon3

  • 1Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea. silver77@hanyang.ac.kr.

Sensors (Basel, Switzerland)
|March 17, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a highly sensitive tactile shear sensor capable of detecting minute forces and surface slip. This innovation holds promise for advanced robotics and surgical tools.

Keywords:
friction detectionhigh sensitivityshear sensorsurface roughness detection

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Area of Science:

  • Materials Science
  • Robotics
  • Sensor Technology

Background:

  • Tactile sensing is crucial for robotic manipulation and interaction.
  • Existing sensors often lack the sensitivity to detect minute shear forces or surface slip.

Purpose of the Study:

  • To develop and characterize a novel, highly sensitive tactile shear sensor.
  • To demonstrate the sensor's capability in detecting low-magnitude shear forces, direction, and surface properties.

Main Methods:

  • Fabrication of a sensor using a suspended elastomer diaphragm, graphene, and digitized electrodes.
  • Applying calibrated shear forces and analyzing the resulting electrical contact patterns.
  • Testing the sensor with objects of varying friction and roughness.

Main Results:

  • The sensor detected shear forces as low as 6 μN.
  • Successfully identified shear direction and distinguished surface friction/roughness.
  • Detected single-thread contact slip motion.

Conclusions:

  • The developed tactile shear sensor offers unprecedented sensitivity for detecting shear and slip.
  • Potential applications include enhanced robotic grippers and precision surgical instruments.