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相关概念视频

Heating and Cooling Curves02:44

Heating and Cooling Curves

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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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...
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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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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

292
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...
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Thermal Stress01:09

Thermal Stress

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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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Mechanism of heat transfer01:19

Mechanism of heat transfer

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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...
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相关实验视频

Updated: Jun 16, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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热性能曲线的灵活模型.

Mauricio Cruz-Loya1, Erin A Mordecai1, Van M Savage2,3,4

  • 1Department of Biology, Stanford University.

bioRxiv : the preprint server for biology
|August 16, 2024
PubMed
概括
此摘要是机器生成的。

一个新的模型,flexTPC,使用可解释的生物特征准确地描述生物温度反应. 这种灵活的模型比现有方法提供了更好的预测,有助于理解热性能变化.

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科学领域:

  • 生态生态学 生态生态学
  • 进化生物学 进化生物学
  • 生理学 生理学 生理学

背景情况:

  • 生物特征如生长和生存往往取决于温度,用热性能曲线 (TPC) 描述.
  • 现有的TPC模型要么过于简单和不灵活,要么过于复杂和生物学上无法解释.
  • 现象学模型 (例如,布里尔函数) 和机械模型 (例如,化学动力学) 在灵活性和解释性方面存在局限性.

研究的目的:

  • 引入flexTPC,一种用于热性能曲线的新型模型.
  • 开发一个具有生物意义的数量 (热最小值,最佳值,最大值和最大特征值) 参数化的TPC模型.
  • 创建一个灵活的模型,能够描述不同斜率和热宽度的TPC,以便进行直接比较.

主要方法:

  • 开发了使用生物可解释参数的flexTPC模型.
  • 应用于微生物和昆虫学数据集的flexTPC.
  • 将flexTPC的预测性能与已建立的Briere模型进行比较.

主要成果:

  • FlexTPC成功地描述了不同形状和热宽度的单模式温度反应.
  • 与布里尔模型相比,该模型在各种数据集中展示了优越的预测性能.
  • 在生物最佳和极限方面进行参数化可以提高模型的可解释性.

结论:

  • FlexTPC为建模热性能曲线提供了一个灵活且生物可解释的框架.
  • 该模型有助于直接比较不同种群,特征或种类的热反应.
  • FlexTPC非常适合研究热反应如何受到生态压力因素的影响或随着时间的推移而演变.