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関連する概念動画

Line Loss01:10

Line Loss

545
The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
545
Reducing Line Loss01:18

Reducing Line Loss

390
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
390
Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

1.1K
Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
1.1K
Energy Losses in Transformers01:21

Energy Losses in Transformers

1.3K
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
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Major Losses in Pipes01:28

Major Losses in Pipes

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
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Minor Losses in Pipes01:25

Minor Losses in Pipes

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In pipe systems, minor losses refer to energy losses arising from components such as valves, bends, fittings, expansions, and other features that disrupt the steady flow of fluid. These disturbances cause energy dissipation through turbulence and resistance, which engineers quantify to manage system efficiency effectively.
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...
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Updated: Feb 9, 2026

Identification of Plant Ice-binding Proteins Through Assessment of Ice-recrystallization Inhibition and Isolation Using Ice-affinity Purification
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南極の氷棚の崩壊は,海氷の減少と海洋の膨張によって引き起こされる

Robert A Massom1,2, Theodore A Scambos3, Luke G Bennetts4

  • 1Australian Antarctic Division, Kingston, Tasmania, Australia. rob.massom@aad.gov.au.

Nature
|June 15, 2018
PubMed
まとめ
この要約は機械生成です。

南極の氷棚の崩壊に寄与しています 季節的な海氷の欠如により 海の膨張によって 氷棚が破裂し 産卵やより広範な崩壊を引き起こします

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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
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科学分野:

  • * 氷河学
  • * 気候科学
  • * 海洋学

背景:

  • * 南極の氷棚の壊滅的な崩壊は,海面上昇の予測にとって大きな懸念事項です.
  • 気候と氷床モデルを改善するために,これらのイベントのドライバーを理解することは極めて重要です.
  • * 地域の海氷の減少は,氷床の安定性の見過ごされた要因でした.

研究 の 目的:

  • * 近年の南極の氷棚の崩壊における地域の海氷の減少の役割を調査する.
  • * 海氷の欠如が氷床の整体性に 影響するメカニズムを特定する.
  • * 氷床モデルに海氷と海波のダイナミクスを組み込む必要性を強調する.

主な方法:

  • * 衛星データと海波記録の分析
  • * アイスシェルフ,海氷,波の相互作用のモデル化
  • *ラッセンA,ラッセンB,ウィルキンス氷棚を含む特定の解体イベントの検討

主要な成果:

  • * 季節的な海氷の欠如により 海の膨張が外側の氷棚の折りたたみや断裂を増加させます
  • * この屈曲は,より広範な氷棚の崩壊を誘発する,脱落につながる可能性があります.
  • * 広範囲の洪水や外縁の断層などの既存の条件は,重要な前提条件です.

結論:

  • * 地域の海氷の減少は,氷床の崩壊に寄与する気候に関連する重要な要因です.
  • 海氷の欠如によって増幅される海波誘発の屈折は,産卵を開始する上で重要な役割を果たします.
  • * 氷床モデルには海氷と海波のダイナミクスを統合して 未来を正確に予測する必要があります