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関連する概念動画

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...
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Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

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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:
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関連する実験動画

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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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

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生分解性粘弾性ポリウレタンフォーム:応用温度における機能的挙動

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
まとめ
この要約は機械生成です。

本研究では、ココナッツオイルと脂肪由来のバイオベースポリオールを使用した粘弾性ポリウレタンフォームを探求します。これらの環境に優しいフォームは、良好な粘弾性特性とエネルギー吸収を提供し、家具用途に有望です。

キーワード:
応用温度ポリウレタン粘弾性フォーム

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Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
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Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
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関連する実験動画

Last Updated: Jan 29, 2026

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科学分野:

  • 材料科学; 高分子化学; 持続可能な材料

背景:

  • ポリウレタンフォームは広く使用されていますが、多くは石油ベースの原料に依存しています。環境負荷低減のために、バイオベース資源からの持続可能な代替品の開発が不可欠です。バイオベースポリオールは、よりグリーンなポリウレタン製造への道を提供する可能性があります。

研究 の 目的:

  • 新規バイオベースポリオールを使用した粘弾性ポリウレタンフォームの合成と特性を調査すること。異なるバイオポリオール(ココナッツオイル、パームオイル、アヒルの脂肪、豚の脂肪)の種類と濃度がフォーム特性に与える影響を評価すること。これらのバイオベースフォームの熱的、機械的、粘弾性性能を潜在的な用途のために評価すること。

主な方法:

  • 4種類のバイオベースポリオール(ココナッツオイル、パームオイル、アヒルの脂肪、豚の脂肪)をポリウレタン配合物(5-20重量%)に組み込みました。熱安定性は、分解研究を通じて分析されました。機械的特性と粘弾性挙動は、-20〜40°Cの温度範囲でテストされました。ヒステリシスと減衰特性を評価しました。

主要な成果:

  • バイオポリオールの組み込みは、わずかな早期分解をもたらしましたが、全体的な熱安定性はわずかに向上しました。ガラス転移温度は、約10°Cで安定したままでした。フォームは、20°Cおよび40°Cで家具に適した粘弾性特性を示しました。ココナッツオイルとアヒルの脂肪由来ポリオールは、エネルギー吸収と減衰を強化しました。

結論:

  • バイオベースポリウレタンフォームは、環境に優しく高性能な材料として可能性を示しています。ココナッツオイルとアヒルの脂肪由来ポリオールは、優れたエネルギー吸収をもたらします。10°C未満の温度での性能は、剛性の増加によって制限される可能性があり、特定の用途への適合性を示唆しています。