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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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The Reynolds transport theorem provides a framework to relate the time rate of change of an extensive property within a system to that in a control volume, which is crucial for analyzing fluid dynamics. Extensive properties, such as mass, velocity, acceleration, temperature, and momentum, can be expressed in terms of the mass of a fluid portion. These properties are called extensive because they depend on the system's size, while intensive properties are their corresponding values per unit...
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The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to...
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Updated: Apr 26, 2026

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メソスケール渦による海洋質量輸送.

Zhengguang Zhang1, Wei Wang2, Bo Qiu3

  • 1Physical Oceanography Lab, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, People's Republic of China.

Science (New York, N.Y.)
|July 19, 2014
PubMed
まとめ

メソスケール渦は,大海流に匹敵する海洋質量を大幅に運ぶ. この渦巻きによる輸送は,海洋循環と気候規制の理解に不可欠です.

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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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科学分野:

  • 海洋学 海洋学とは
  • 気候科学 気候科学
  • 流体力学 流体力学とは

背景:

  • 熱と塩の輸送を含む海洋循環は,世界の気候規制と海洋資源の分配に不可欠です.
  • 大規模な流れが流体輸送を支配する一方で,メソスケールの渦は,水塊の移動にも役割を果たします.

研究 の 目的:

  • メソスケール渦が海洋におけるゾナル・マス・トランスポートに与える影響を定量化するために.
  • 渦によって引き起こされる輸送を,確立された海洋循環パターンと比較するために.

主な方法:

  • 衛星高度測定データを活用して,メソスケール渦を特定し,追跡しました.
  • 流体の性質と動きを測定するために,Argoプログラムからの統合プロファイリングフロートデータ.
  • 渦が誘発したゾナル・マス・トランスポートを計算するための組み合わせられたデータセット.

主要な成果:

  • 渦が誘発するゾナル・マス・トランスポートは,30〜40スヴェルドループ (Sv) に達する.
  • この重要な輸送は,主に背景流が弱い亜熱帯地域で観察されます.
  • 渦の輸送の規模は,風力や熱ハリンによる大規模な循環に匹敵する.

結論:

  • メソスケール渦は,以前は過小評価されていた海洋質量輸送の重要な構成要素を表しています.
  • 渦のダイナミクスを理解することは,正確な気候モデリングと海洋資源の分布を予測するために不可欠です.