Thermal Excitation
Thermal Excitation - Related Videos
09:42
Analysis of Thermal Expansion via Dilatometry
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2023
Source: J. Jacob Chavez, Ryan T. Davis, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Thermal expansion is extremely important when considering which materials will be used in systems that experience fluctuations in temperature. A high or low thermal expansion in a material may or may not be desirable, depending on the application. For instance, in a common liquid thermometer, a material with a high thermal expansion would be...
12:33
Corticospinal Excitability Modulation During Action Observation
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Cited by 22 •
2013
Single-pulse transcranial magnetic stimulation over the primary motor cortex, neuronavigation, and registration of electromyographic activity of hand muscles were used in this study to explore corticospinal excitability while participants were observing action sequences.
12:13
Assessing Primary Motor Cortex Excitability and Excitability Modulation by Pairing Transcranial Magnetic Stimulation with Electromyography
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2025
Here, we present a protocol outlining the methodology to assess primary motor cortex excitability and excitability modulation using transcranial magnetic stimulation (TMS) paired with electromyography (EMG).
10:32
Thermal Diffusivity and the Laser Flash Method
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2023
Source: Elise S.D. Buki, Danielle N. Beatty, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT The laser flash method (LFA) is a technique used to measure thermal diffusivity, a material specific property. Thermal diffusivity (α) is the ratio of how much heat is conducted relative to how much heat is stored in a material. It is related to thermal conductivity (), how much heat is transferred through a material due to a temperature...
01:27
Thermal expansion and Thermal stress: Problem Solving
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2023
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.
FAQs
At higher temperatures, atomic collisions and lattice vibrations redistribute thermal energy through a material. That energy can increase molecular motion and, in suitable materials, move electrons or structural modes into higher-energy states. The resulting response depends on which parts of the system can absorb energy, so engineers examine microscopic excitation alongside observable thermal, electrical, or mechanical changes.
Increasing thermal excitation can produce thermal expansion and alter electrical or mechanical properties. It may also promote vibrational or electronic transitions when the material supports those responses. These effects are important because a component can change dimensions, electrical behavior, or mechanical performance as operating temperature changes, even when its basic design and composition remain unchanged.
Lattice vibrations provide a pathway for heat-related energy to move through a material at the atomic scale. As temperature rises, these vibrations become more significant and contribute to increased molecular motion. Their behavior helps engineers connect heat transfer with larger-scale effects, including dimensional changes and temperature-dependent mechanical or electrical performance.
Engineers distinguish these responses by considering which part of the system occupies a higher-energy state. Electronic responses concern electrons, vibrational responses concern molecular or lattice motion, and structural responses concern the material’s physical modes. This separation clarifies whether heating primarily changes electrical behavior, internal motion, or mechanical form, supporting more targeted system analysis.
A practical evaluation begins by identifying how heat enters the system and how energy is transferred through the material. Engineers then examine temperature-dependent changes in motion, dimensions, electrical properties, or mechanical behavior. Comparing these responses across operating conditions helps reveal expected performance changes and establishes whether the design remains suitable as temperature varies.
Sensors and actuators can exploit temperature-driven changes in a material’s electrical, mechanical, or structural behavior. Engineers analyze how excitation modifies the selected response and then use that predictable change for detection or movement. The usefulness of the device depends on matching the material’s temperature response to the intended function and operating conditions.
Operating temperature can change dimensions, electrical characteristics, mechanical behavior, and the energy states available within a material. Engineers therefore assess these temperature-dependent responses when predicting performance limits. This analysis helps determine whether a component or system can maintain its intended function as heat transfer and thermal conditions vary during operation.