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相关概念视频

Exponential Functions with Base e01:30

Exponential Functions with Base e

240
Exponential functions with base e are essential for modeling continuous processes of growth and decay. The constant e, approximately 2.718, naturally arises in systems where change occurs proportionally to the current value. A positive exponent represents continuous growth, while a negative exponent represents continuous decay. These functions are especially useful for describing situations where change happens smoothly over time rather than in discrete steps.One clear example of exponential...
240
Applications of Integration to Probability Density Functions01:27

Applications of Integration to Probability Density Functions

51
Continuous probability distributions are used to model random variables that can take on any real value within a specified range. These variables do not take on isolated or countable values but rather exist on a continuum. For example, the height of an individual can be measured with increasing precision—such as 163.5 or 165.25 centimeters—demonstrating that height is a continuous random variable.The behavior of such variables is described using a probability density function (PDF),...
51
What is Behavior?00:54

What is Behavior?

10.3K
Behaviors are actions that an organism engages in—they can be related to finding food, reproducing, defending against threats, and many other possible actions. Behaviors include activities related to the environment around the animal—such as migration—as well as social interactions within a species or population. Many behaviors involve motor output—that is, muscle movements—while others involve less visible actions, such as learning.
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Body Temperature01:25

Body Temperature

4.2K
The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
4.2K
Body Temperature01:07

Body Temperature

1.4K
Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
The average body temperature is approximately 37°C (98.6°F) and typically ranges from 36.1–37.2°C...
1.4K
Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

28.2K
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
28.2K

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相关实验视频

Updated: Jan 29, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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生物基粘弹性聚氨泡:在各种应用温度的功能性行为.

Elżbieta Malewska1, Konstantinos N Raftopoulos1, Piotr Rytlewski2

  • 1Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland.

Polymers
|January 28, 2026
PubMed
概括
此摘要是机器生成的。

这项研究探讨了用子油和脂肪的生物基聚合物制成的粘弹性聚氨泡. 这些环保泡对家具应用有前途,具有良好的粘弹性和能量吸收性.

关键词:
使用温度应用温度.聚氨是一种聚氨.粘弹性泡是一种粘弹性泡.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 可持续材料 可持续材料

背景情况:

  • 聚氨泡被广泛使用,但通常依赖于以石油为基础的原料.
  • 从生物基资源开发可持续替代品对于减少环境影响至关重要.
  • 生物基聚醇为更绿色的聚氨生产提供了潜在的途径.

研究的目的:

  • 使用新型生物基聚合物研究粘弹性聚氨泡的合成和特性.
  • 为了评估不同类型的生物多元醇 (子油,棕油,子脂肪,猪脂肪) 和度对泡特性的影响.
  • 评估这些生物基泡的热,机械和粘弹性性能,以了解潜在的应用.

主要方法:

  • 四种生物基聚醇 (子油,棕油,子脂肪,猪脂肪) 被纳入聚氨配方中 (5-20%).
  • 热稳定性通过分解研究来分析.
  • 机械性能和粘弹性行为在-20-40°C的温度范围内进行了测试.
  • 评估了歇斯底里和阻尼特征.

主要成果:

  • 生物聚合物的结合导致了轻微的早期分解,但略有改善了整体热稳定性.
  • 玻璃过渡温度保持稳定,在10°C左右.
  • 泡在20°C和40°C时表现出适合家具的粘弹性.
  • 子油和子脂肪聚合物增强了能量吸收和抑制.

结论:

  • 生物基聚氨泡显示出作为环保,高性能材料的潜力.
  • 子油和子脂肪衍生的聚醇产生优越的能量吸收.
  • 在低于10°C的温度下,性能可能会受到增加的刚度的限制,这表明它适合特定的应用.