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関連する概念動画

Korotkoff Sounds01:12

Korotkoff Sounds

Korotkoff sounds are the specific sounds heard while measuring blood pressure using a sphygmomanometer, typically with a stethoscope or a Doppler device. They are named after Russian physician Nikolai Korotkov, who first described them in 1905. These sounds correspond to turbulent blood flow in the artery as the blood pressure cuff is gradually released after inflation.
During blood pressure assessment, inflating the cuff 30 millimeters of mercury above the patient's systolic blood pressure...
Dry Friction01:30

Dry Friction

Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
Static Friction01:18

Static Friction

Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...
Physical Assessment of the Respiratory Tract IV: Auscultation01:28

Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
Breath Sounds
Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.
Microcracking in Concrete01:20

Microcracking in Concrete

Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
Plastic...

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関連する実験動画

Updated: Jul 8, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

クラクラする音が聞こえてくる.

J P Sethna1, K A Dahmen, C R Myers

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA.

Nature
|March 22, 2001
PubMed
まとめ
この要約は機械生成です。

多くのスケールにわたる衝動的な出来事によって特徴づけられるクラッキングノイズは,多様な物理系で観察される普遍的な現象です. マグネティック・クラックリングのような単純なモデルは,この行動を効果的に捉え,スケール不変の性質を明らかにします.

さらに関連する動画

Troubleshooting and Quality Assurance in Hyperpolarized Xenon Magnetic Resonance Imaging: Tools for High-Quality Image Acquisition
09:55

Troubleshooting and Quality Assurance in Hyperpolarized Xenon Magnetic Resonance Imaging: Tools for High-Quality Image Acquisition

Published on: January 5, 2024

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

関連する実験動画

Last Updated: Jul 8, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

Troubleshooting and Quality Assurance in Hyperpolarized Xenon Magnetic Resonance Imaging: Tools for High-Quality Image Acquisition
09:55

Troubleshooting and Quality Assurance in Hyperpolarized Xenon Magnetic Resonance Imaging: Tools for High-Quality Image Acquisition

Published on: January 5, 2024

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

科学分野:

  • 物理 物理学 物理学とは
  • 複雑なシステム 複雑なシステム
  • 統計力学 統計力学 統計力学

背景:

  • クラックリングノイズは,異なった大きさの離散的,衝動的なイベントを通じて外部変化に反応するシステムを記述します.
  • 地震や紙の折りたたみなど,様々な物理系では,割れ声が聞こえます.
  • 普遍性は,システムの行動は顕微鏡の細部から独立していることを示唆し,単純化されたモデリングを可能にします.

研究 の 目的:

  • クラッキングノイズ現象における普遍性の概念を例示するために.
  • 複雑なシステムを理解するために単純なモデルの適用を実証する.
  • クラッキングノイズの分析におけるリノーマライゼーショングループ方法とスケーリングクラップスの使用を説明するために.

主な方法:

  • 磁気システムにおけるクラッキングノイズのモデルの開発と分析.
  • 規模不変の性質を研究するために,リノルマライゼーショングループテクニックの適用.
  • スケーリング・クラップスを利用して,異なるシステムにおける普遍的な行動を特定します.

主要な成果:

  • シンプルなモデルがクラッキングノイズの普遍的な振る舞いを捉えることができることを実証しました.
  • クラッキングノイズの分析におけるリノーマライゼーショングループとスケーリング崩壊の有効性を示した.
  • イベントサイズの幅広い範囲でクラッキングノイズのスケール不変性を強調しました.

結論:

  • クレイクリングノイズ現象は普遍性を示し,単純化されたモデリングと分析を可能にします.
  • リノルマライゼーショングループ法とスケーリング崩壊は,複雑なシステムにおける普遍的な行動を研究するための強力なツールです.
  • クラッキングノイズの分野における継続的な課題に対処するために,さらなる研究が必要である.