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Impact: Problem Solving01:26

Impact: Problem Solving

In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
Porosity in Cement Paste01:18

Porosity in Cement Paste

The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is critical—it...
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...

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関連する実験動画

Updated: Jun 11, 2026

Atom Probe Tomography Analysis of Exsolved Mineral Phases
08:14

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

アポロ17号の衝突で融解したブレッチアのグラファイト.

A Steele1, F M McCubbin, M Fries

  • 1Carnegie Institution of Washington, Geophysical Laboratory, 5251 Broad Branch Road N.W., Washington, DC 20015, USA. asteele@ciw.edu

Science (New York, N.Y.)
|July 3, 2010
PubMed
まとめ
この要約は機械生成です。

結晶グラファイトとグラファイトウィスカー (GWs) が月面のサンプルで見つかり,衝突イベントがこれらの構造を作り出すことを示唆しています. この発見は,月が遅い重爆撃期からの古代炭素を保存していることを示しています.

さらに関連する動画

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

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

関連する実験動画

Last Updated: Jun 11, 2026

Atom Probe Tomography Analysis of Exsolved Mineral Phases
08:14

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

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

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

科学分野:

  • * 月の地質学と地化学
  • * 宇宙化学とアストロ材料科学
  • * 惑星科学とインパクトクレーター調査

背景:

  • * グラファイトホイッスル (GWs) は,潜在的な応用を持つ新しい炭素ナノ構造です.
  • *それらの形成メカニズムを理解することは,材料科学と惑星探査にとって極めて重要です.
  • * 過去の研究は,地球外生命体の衝突事件と地球外生命体の形成を決定的に結びつけていない.

研究 の 目的:

  • * 月面サンプル内の炭酸性物質を特定し,特徴づけること.
  • *アポロ17号の衝突で溶けたブレッチャで発見されたグラファイトとGWの起源を調査する.
  • * 太陽系における炭素ナノ構造の形成における衝突過程の役割を調査する.

主な方法:

  • *アポロ17号の衝突で溶けたブレチヤのサンプルを顕微鏡で検査した.
  • *高度なイメージング技術を用いた結晶グラフィットとグラフィットウィスカー (GWs) の分析.
  • *地質化学的文脈分析により,地上の汚染を排除する.

主要な成果:

  • * 月面のサンプル内で,水晶グラファイトとGWの離散粒子の検出.
  • * グラファイトとGWの空間的関連は,サンプル内の共通の起源を示唆しています.
  • *地上の汚染指標の欠如は,インシトゥの月の起源を支持する.

結論:

  • *インパクトプロセスは,太陽系でGWを生成するための妥当なメカニズムです.
  • * 月は,後期の大爆撃期からの古代炭酸物質の貯蔵庫として機能しています.
  • * この発見は,天体における炭素循環に関する我々の理解を広げている.