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Related Concept Videos

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...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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...
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant 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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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Published on: August 5, 2013

Write compensation using the thermal transfer function in an optical disk.

T Tanabe, Y Tanaka, R Arai

    Applied Optics
    |October 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel write-compensation scheme for optical disks, simplifying thermal transfer functions. The method ensures uniform mark edges by eliminating thermal interference, enhancing data recording accuracy.

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    Area of Science:

    • Optical data storage
    • Thermal engineering
    • Signal processing

    Background:

    • Optical disk recording faces challenges from thermal interference affecting mark edge uniformity.
    • Existing methods struggle to compensate for complex thermal dynamics during writing.

    Purpose of the Study:

    • To develop a theoretical basis for a write-compensation scheme in optical disks.
    • To simplify the thermal transfer function for practical application.
    • To achieve uniform mark edge formation and eliminate thermal interference.

    Main Methods:

    • Analytical approximation of the thermal transfer function to a first-order exponential filter.
    • Derivation of a write-compensation method using the inverse of the filter function.
    • Experimental verification of a simplified compensation form.

    Main Results:

    • The thermal transfer function was successfully approximated by a simplified filter.
    • A novel write-compensation method was derived and validated experimentally.
    • The proposed method effectively eliminates thermal interference.

    Conclusions:

    • The developed write-compensation scheme provides a theoretical and practical solution for uniform mark edge formation in optical disks.
    • This approach enhances data recording fidelity by mitigating thermal crosstalk.
    • The simplified inverse filter method is applicable to arbitrary optical disk media.