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Conditions on Early Earth02:06

Conditions on Early Earth

96.2K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
96.2K
Nuclear Stability03:18

Nuclear Stability

19.7K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
19.7K
Nuclear Fusion02:45

Nuclear Fusion

31.0K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
31.0K
Nuclear Transmutation03:20

Nuclear Transmutation

18.0K
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
18.0K
Nuclear Fission02:50

Nuclear Fission

10.3K
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large...
10.3K
Conservation of Mass in Finite Cotrol Volume01:16

Conservation of Mass in Finite Cotrol Volume

1.4K
The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
1.4K

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Updated: Sep 9, 2025

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

11.6K

内核核形成から地球の核の組成を制限する

Alfred J Wilson1, Christopher J Davies2, Andrew M Walker3

  • 1School of Earth and Environment, University of Leeds, Leeds, UK. a.j.wilson1@leeds.ac.uk.

Nature communications
|September 4, 2025
PubMed
まとめ
この要約は機械生成です。

地球の核の構成は その進化の鍵です 新しいシミュレーションでは 鉄と炭素の核は 内核核と互換性があり 可能な元素を制限しています

さらに関連する動画

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
11:50

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

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Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
06:06

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

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関連する実験動画

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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
06:06

Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

Published on: August 17, 2016

11.4K

科学分野:

  • 地理学
  • 地球科学
  • 惑星科学

背景:

  • 地球の核の構成は,地球構造の深部,熱の進化,磁場生成を理解するために重要です.
  • 現在のモデルは,コスモケミカル,形成,地震学的データをコア組成と調和させる上で課題に直面しています.
  • 内核形成における超冷却の役割は論争の的であり,いくつかの二元核の組成は核形成と相容れない.

研究 の 目的:

  • 特定の鉄-炭素 (Fe-C) 核の組成と内核核の互換性を調査する.
  • 超冷却の要件に対応した,現実的な地質学的条件下でFe-C合金が核化できるかどうかを決定する.
  • 地球の核の組成に関する制約を 核化の振る舞いを評価することによって 精製する.

主な方法:

  • 内核の核形成過程をモデル化するために分子ダイナミクスシミュレーションを使用した.
  • 適切な圧力と温度条件下で,鉄と炭素の組成 (Fe1-xC x=0.1-0.15) をシミュレートした.
  • 核の形成と性質に関する既存の地質学的制約と比較したシミュレーション結果.

主要な成果:

  • Fe-C組成 (Fe1-xC x=0.1-0.15) が内核核化と互換性があることを実証した.
  • 極度の超冷却を必要とせずに核化することが示され,地質学的観測に準拠しています.
  • 潜在的核組成を区別する重要な要因として内核の核化が特定された.

結論:

  • 内核核化は,地球の核の可能な化学組成に強い制約を与える.
  • 鉄と炭素の合金は 核の動力学と一致する 地球の核の組成に適した候補です
  • この研究は 核の形成と組成に関する理解を深め 長年にわたる地質学的パズルの解明に役立ちます