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相关概念视频

The Water Cycle01:00

The Water Cycle

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The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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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

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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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Body Water Content and Fluid Compartments01:19

Body Water Content and Fluid Compartments

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Life's biochemical processes occur within aqueous solutions. Solutes are substances that are dissolved within these solutions. The human body contains a variety of solutes, which can differ across various body parts. These can encompass proteins—such as those responsible for clotting and carbohydrate transport—as well as electrolytes. In medicine, an electrolyte is often described as a mineral ion derived from a salt possessing an electric charge. Examples include sodium ions...
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Fluid Movement Between Compartments01:18

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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相关实验视频

Updated: May 1, 2026

Reservoir Condition Pore-scale Imaging of Multiple Fluid Phases Using X-ray Microtomography
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整个的对流和过渡区的水过器.

David Bercovici1, Shun-Ichiro Karato

  • 1Department of Geology and Geophysics, Yale University, PO Box 208109, New Haven, Connecticut 06520-8109, USA. david.bercovici@yale.edu

Nature
|September 5, 2003
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概括
此摘要是机器生成的。

地球的地幔可能没有孤立的水库. 相反,在410公里不连续的水过器模型解释了玄武岩的地化学差异,协调了地质和地物理数据.

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科学领域:

  • 地质化学 地质化学
  • 地质物理学 地质物理学
  • 地幔石化学地幔石化学

背景情况:

  • 海洋岛基岩 (OIB) 和中海基岩 (MORB) 的独特化学特征传统上表明隔离的地幔储库.
  • 现有的地幔水库模型与地球化学数据保持一致,但与地球物理观测相冲突.

研究的目的:

  • 为基岩岩形成提出一个替代模型.
  • 用地幔过机制来解释玄武岩的地化学变化.
  • 在地幔研究中协调地质化学和地质物理差异.

主要方法:

  • 在410公里不连续的地幔过程的概念建模.
  • 脱水引起的部分融和元素过的分析.
  • 假设在地幔过渡区中水溶性的作用.

主要成果:

  • 提出了一个过渡区水过器模型,在410公里的脱水引起的融化将不兼容的元素分开.
  • 过的,干燥的地幔上升,形成MORB源.
  • 丰富的融残留物被困在410公里的不连续性,可能会影响OIB来源和早期地形成.

结论:

  • 过渡区水过器模型为OIB和MORB的地化学特征提供了统一的解释.
  • 这个模型解决了地质化学和地质物理数据之间的冲突,挑战了隔离地幔水库概念.
  • 该模型还解释了OIB和早期大陆地的丰富特征,以及Archaean地幔过程中的变化.