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Related Concept Videos

Thermal Stress01:09

Thermal Stress

2.7K
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...
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Assessing Body Temperature - Temporal Artery01:19

Assessing Body Temperature - Temporal Artery

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Here is a stepwise guide to assessing the body temperature at the temporal artery using a temporal artery thermometer
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.  
Step 3: Assess the patient's...
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Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

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Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
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Assessing Body Temperature - Axilla01:14

Assessing Body Temperature - Axilla

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Procedural Guide for Assessing Axillary Body Temperature using a Digital Thermometer:
Step 1: Perform hand hygiene and put on clean gloves to maintain infection control and prevent cross-contamination.
Step 2: Prepare the patient by explaining the procedure to ensure understanding and cooperation. Ensure privacy, expose the axilla, and inform the patient that minimal movement is crucial for an accurate reading.
Step 3: Adjust the patient’s clothing to expose only the axilla. It minimizes...
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Thermal Strain01:19

Thermal Strain

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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...
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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Thermal Imaging to Study Stress Non-invasively in Unrestrained Birds
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Towards a Contactless Stress Classification Using Thermal Imaging.

Federica Gioia1,2, Alberto Greco1,2, Alejandro Luis Callara1,2

  • 1Dipartimento di Ingegneria dell'Informazione, University of Pisa, 56122 Pisa, Italy.

Sensors (Basel, Switzerland)
|February 15, 2022
PubMed
Summary
This summary is machine-generated.

Thermal imaging offers a contactless method for stress detection. This study shows thermal features significantly contribute to accurately identifying acute stress, achieving 86.84% accuracy independently.

Keywords:
contactlessstress detectionsupport vector machinethermal imagingwearable systems

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Area of Science:

  • Physiological monitoring
  • Biomedical engineering
  • Human-computer interaction

Background:

  • Thermal cameras non-invasively measure infrared radiation, reflecting autonomic nervous system (ANS) activity via skin temperature.
  • Skin temperature variations are linked to physiological stress responses.
  • Contactless monitoring is desirable for unobtrusive stress assessment.

Purpose of the Study:

  • To evaluate the effectiveness of thermal imaging in automatic stress detection.
  • To develop a contactless stress recognition system using thermal data.
  • To compare the contribution of thermal features versus traditional ANS correlates in stress detection.

Main Methods:

  • Recorded thermal images and ANS correlates (cardiac, electrodermal, respiratory activity) from 25 volunteers under induced acute stress (Stroop test).
  • Extracted features from both thermal and ANS signals.
  • Implemented subject-independent stress classification using Support Vector Machine (SVM) with recursive feature elimination.

Main Results:

  • Thermal features significantly contributed to stress detection accuracy.
  • A combined model of ANS correlates and thermal features achieved 97.37% accuracy.
  • A model using only thermal features achieved 86.84% accuracy for contactless stress detection.

Conclusions:

  • Thermal imaging is a valuable tool for contactless, automatic stress detection.
  • Integrating thermal data enhances the accuracy of stress recognition systems.
  • Contactless thermal monitoring shows significant potential for real-world stress assessment applications.