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関連する概念動画

General External Flow Characteristics01:26

General External Flow Characteristics

481
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
5.4K
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Couette Flow01:22

Couette Flow

828
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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関連する実験動画

Updated: Jan 2, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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赤道角の穴から発生する 構造の高いゆっくりとした太陽風

S D Bale1,2,3,4, S T Badman5,6, J W Bonnell5

  • 1Space Sciences Laboratory, University of California, Berkeley, CA, USA. bale@berkeley.edu.

Nature
|December 6, 2019
PubMed
まとめ

科学者たちはパーカー・ソーラー・プローブを使って 太陽の太陽風を研究しました 彼らは低緯度の冠状孔が 衝動的なエネルギーメカニズムによって駆動される ゆっくりとした太陽風の主要な源である証拠を発見しました

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関連する実験動画

Last Updated: Jan 2, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Published on: July 19, 2016

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科学分野:

  • ヘリオフィジックスと宇宙物理学
  • 太陽物理学
  • プラズマ物理学

背景:

  • 太陽からのプラズマの流れである太陽風には 明確な高速と遅い成分があります
  • ゆっくりとした太陽風の起源とその加熱メカニズムはまだ不明です
  • 過去の観測では 混合して進化した太陽風が 源の詳細を隠しています

研究 の 目的:

  • 太陽に近い太陽風の源と特徴を調査する
  • 太陽風が加熱し加速するメカニズムを特定する.

主な方法:

  • パーカー・ソーラー・プローブの観測を 36~54太陽半径で利用した.
  • 磁場データを分析した プラズマの流れとポインティングの流れ
  • プラズマ波で微小な不安定性を測定した.

主要な成果:

  • 微小な赤道角の穴から発するゆっくりとしたアルフェニック太陽風が観測された.
  • プラズマ・ジェットとポインティング・フルスによる 断続的な磁場逆転が検出されました
  • プラズマ加熱に関連した電子とイオン速度の微小不安定性.

結論:

  • 低緯度の冠状孔は ゆっくりとした太陽風の重要な源です
  • 衝動的エネルギーメカニズムと微小の不安定性は太陽風の加熱に重要な役割を果たします.