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Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Gyroscope: Precession01:24

Gyroscope: Precession

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Vibrating Concrete01:19

Vibrating Concrete

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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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スキャニングプレセシオン電子 difraktion を用いた熱振動の特徴化によるナノスケール温度マッピング.

Kun Yang1, Chao Zhang1, Chengwei Wu2

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Future Material Innovation Center, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, China.

Science advances
|February 13, 2026
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まとめ
この要約は機械生成です。

研究者は,伝送電子顕微鏡を用いた新しいナノスケール温度測定技術を開発しました. この方法は,ナノメートルの空間解像度を達成し,先進的な材料の正確な温度測定を実現します.

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Last Updated: Feb 15, 2026

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科学分野:

  • マテリアルサイエンス 材料科学
  • 物理 物理学 物理学とは
  • ナノテクノロジー ナノテクノロジー

背景:

  • ナノスケールの正確な温度測定は,統合されたデバイスと異質なインターフェースの熱的振る舞いを理解するために重要です.
  • 現在の技術では,ナノスケールアプリケーションに必要な空間解像度が欠けていることが多い.

研究 の 目的:

  • ナノメートルの空間解像度で直接的,非接触温度測定方法を実証する.
  • ナノスケール温度測定のための広く適用可能な戦略を確立する.

主な方法:

  • 伝送電子顕微鏡 (TEM) を利用し,スキャニングナノビームとプレセシオン電子 difrractionを組み合わせました.
  • ナノメートルスケールの領域から集めた動力 difraktion 強度.
  • 構造因子に基づく補正を施し,屈折強度の線形フィッティングを行い,デビー・ウォーラー因子を決定した.

主要な成果:

  • °Cあたり10−4平方アングストームの精度で温度測定を達成しました.
  • グラフェンをモデル材料として使用して,方法の適用性を実証しました.
  • 試料の傾き,熱膨張,厚さの影響がデビー・ウォーラー因子に及ぼす影響を調査した.

結論:

  • 開発されたTEMベースのアプローチは,直接的な非接触ナノスケール温度計を可能にします.
  • この技術は,高空間解像度と精度を提供し,低次元と異質な材料に適しています.
  • この研究は,ナノスケール温度計における測定精度と空間解像度を高めるための経路を提供します.