Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Travelling Waves01:04

Travelling Waves

5.2K
A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
5.2K
Back EMF01:24

Back EMF

2.9K
Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a current through a loop of wire located in a magnetic field. As a result, the magnetic field exerts a torque on the loop. This rotates a shaft, extracting mechanical work from the electrical current sent in initially. When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday's law) is...
2.9K
Propagation of Waves01:07

Propagation of Waves

2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K
Reflection of Waves01:07

Reflection of Waves

3.7K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
3.7K
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

5.2K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.2K
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

1.3K
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,...
1.3K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Predicting sentinel lymph node metastasis in breast cancer using an interpretable machine learning approach based on multi-domain clinical features.

Breast cancer research : BCR·2026
Same author

Bisphenol A promotes esophageal carcinogenesis by activating the MMP1-PCOLCE regulatory axis and remodeling the tumor immune microenvironment.

Naunyn-Schmiedeberg's archives of pharmacology·2026
Same author

Molecular mechanism by which perfluorooctane sulfonate regulates the initiation and progression of prostate cancer via the ENTPD5-adenine axis.

Naunyn-Schmiedeberg's archives of pharmacology·2026
Same author

Intelligent logic-gate-integrated capillary fluorescence imprinted microarray sensor for rapid simultaneous detection of multiple endocrine disrupting compounds.

Talanta·2026
Same author

Clinical efficacy and platform-specific analysis of robotic navigation systems in adolescent idiopathic scoliosis: a meta-analysis.

Journal of robotic surgery·2026
Same author

Comparative clinical performance of robotic-assisted systems in spinal deformity surgery: focus on perioperative outcomes and pedicle screw accuracy.

Journal of robotic surgery·2026

関連する実験動画

Updated: Jun 24, 2025

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
07:58

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

Published on: August 7, 2017

9.3K

地震波形変化による内核の逆転

Wei Wang1,2,3, John E Vidale4, Guanning Pang5

  • 1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.

Nature
|June 12, 2024
PubMed
まとめ
この要約は機械生成です。

地球の固い内核は2003年から2008年の間に地表より速く回転し,2008年から2023年まで方向を逆転し,よりゆっくり回転した. 地震波分析に基づくこの発見は,地球のコアダイナミクスに新しいモデルが必要であることを示唆しています.

さらに関連する動画

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
06:55

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

Published on: August 5, 2016

8.2K
Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

7.8K

関連する実験動画

Last Updated: Jun 24, 2025

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
07:58

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt

Published on: August 7, 2017

9.3K
Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
06:55

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling

Published on: August 5, 2016

8.2K
Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

7.8K

科学分野:

  • 地理学
  • 地震学
  • 地球科学

背景:

  • 地球の固体内核の表面に対する回転は地震データから推測されている.
  • 内核の構造と動態は 地球の磁場に影響を与えます
  • 以前の研究では 内核の回転速度が 変化していることが示されました

研究 の 目的:

  • 地球の内核の進行と後退を 精密に追跡する
  • 地震波データを用いて内核の回転ダイナミクスを分析する
  • 内核の動きと 地球の磁場との関係を調査する

主な方法:

  • サウス・サンドウィッチ諸島の1991年から2023年までの143回の地震をまとめました.
  • 中央に侵入するPKIKP波を 分析した. 中央に侵入するPKIKP波を
  • 内核の位置を追跡するために重複する地震の波形の変化と逆転を特定しました.

主要な成果:

  • 記録された波形の変化と,その後の反転は,内核が過去の位置を再占することを示しています.
  • 内核は2003年から2008年まで 超回転していたことを証明した
  • 内核は2008年から2023年にかけて 2~3倍遅い速度で転移し 軌道に戻った.

結論:

  • 地球の内核は,超回転と,その後の遅いサブ回転の期間を示し,同じ経路で戻ります.
  • 内核の進行と回帰の 精密な追跡が可能です
  • 内核,外核,マントルの間のダイナミクスの新しいモデルを必要とします.