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関連する概念動画

Tidal Forces01:06

Tidal Forces

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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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Isothermal Processes01:21

Isothermal Processes

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A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

874
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...
874
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

971
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
971
Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

171
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,...
171
Isochoric and Isobaric Processes01:21

Isochoric and Isobaric Processes

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A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only. 
Suppose 1000 g of water is heated from 40...
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関連する実験動画

Updated: Jun 5, 2025

A Strain Gauge Monitor SGM for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH
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A Strain Gauge Monitor SGM for Continuous Valve Gape Measurements in Bivalve Molluscs in Response to Laboratory Induced Diel-cycling Hypoxia and pH

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イオの潮の反応は 浅いマグマの海を排除する

R S Park1, R A Jacobson2, L Gomez Casajus3

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. Ryan.S.Park@jpl.nasa.gov.

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

ロ

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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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科学分野:

  • 惑星科学
  • 地理学
  • 天文学

背景:

  • イオの火山活動は 木星の周回軌道からの潮による熱によって引き起こされます
  • この潮のエネルギー散布は 地球の表面下にあるマグマの海という説を 導き出した.
  • 浅いマグマの海は イオの潮変形を 劇的に増加させるでしょう

研究 の 目的:

  • ジュノ宇宙船のデータを用いて イオの潮変形を測定する
  • 重力潮のラブ数 (k2) と潮分散パラメータ (Q) を定量化する.
  • イオの浅いマグマ海洋の仮説を 検証するためです

主な方法:

  • ジュノとガリレオのドップラー観測データを分析した.
  • 天文観測の統合
  • 重力潮のラブ数 (Re(k2) と潮分散パラメータ (Q) の計算.

主要な成果:

  • 測定されたRe ((k2) = 0.125 ± 0.047とQ = 11.4 ± 3.6.
  • これらの値は,イオの潮変形が, 浅い地球マグマ海洋で予想されるよりも小さいことを示しています.
  • この結果は,イオは主に固体マントルを持っていると一致しています.

結論:

  • イオには 浅いマグマの海はありません
  • 潮の力は必ずしもマグマの海洋形成につながらない.
  • 急速な融解の上昇,侵入,噴火は,強い潮の加熱でもマグマの海洋形成を防ぐことができます.