Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

17.9K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
17.9K
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

144
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
144
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

138
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
138
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

111
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
111
Types of Building Stone01:30

Types of Building Stone

667
Building stones, essential materials for construction, are extracted from natural rock deposits and processed into specific forms and dimensions suitable for various building applications. These stones are broadly classified into three types based on their geological formation: igneous, sedimentary, and metamorphic.
Igneous rocks are formed from the solidification of magma or lava. An example is granite, known for its durability and resistance to weathering, making it ideal for parts of...
667
Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

1.2K
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...
1.2K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Enhancements in Laser-Direct-Drive Nuclear Performance with Target Radius.

Physical review letters·2026
Same author

The Psyche Multispectral Imager Investigation: Characterizing the Geology, Topography, and Multispectral Properties of a Metal-Rich World.

Space science reviews·2025
Same author

Applications of a Rayleigh-Taylor model to direct-drive laser fusion.

Physical review. E·2024
Same author

Three-dimensional reconstruction of laser-direct-drive inertial confinement fusion hot-spot plasma from x-ray diagnostics on the OMEGA laser facility (invited).

The Review of scientific instruments·2024
Same author

Young asteroid families as the primary source of meteorites.

Nature·2024
Same author

The Massalia asteroid family as the origin of ordinary L chondrites.

Nature·2024
Same journal

Daily briefing: 'Cyborg' cockroaches breathe underwater with printed suit.

Nature·2026
Same journal

China boosts prestigious grants for young scientists - will it ease competition?

Nature·2026
Same journal

Incoming US science academy chief vows to 'double down' on research.

Nature·2026
Same journal

Author Correction: Synthesis of enantioenriched atropisomers by biocatalytic deracemization.

Nature·2026
Same journal

Electrodeposited self-assembled molecules for perovskite photovoltaics.

Nature·2026
Same journal

Neutrino's nursery found: the 'Shadow Blaster'.

Nature·2026
関連記事をすべて見る

関連する実験動画

Updated: Apr 26, 2026

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

14.8K

隕石と近地小惑星の組成の違い

P Vernazza1, R P Binzel, C A Thomas

  • 1Research and Scientific Support Department, European Space Agency, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands. pierre.vernazza@esa.int

Nature
|August 16, 2008
PubMed
まとめ
この要約は機械生成です。

ほとんどの近地小惑星は,珍しいLLコンドライト隕石とスペクトル特性を共有しており,驚くべき起源を示唆しています. フローラ小惑星ファミリーは,輸送のためのヤルコフスキー効果の影響を受ける可能性のある主要な源である可能性があります.

さらに関連する動画

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
10:12

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

8.3K
Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

11.5K

関連する実験動画

Last Updated: Apr 26, 2026

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

14.8K
Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
10:12

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

8.3K
Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

11.5K

科学分野:

  • 惑星科学は惑星科学である.
  • 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
  • 宇宙化学 (コスモケミストリー)

背景:

  • 地球近傍小惑星 (NEAs) と潜在的に危険な小惑星 (PHAs) の理解は,科学的および実用的な理由から極めて重要です.
  • 小惑星の組成は,地球で見られる一般的な隕石の組成を反映すると予想されています.

研究 の 目的:

  • NEAとPHAのスペクトル特性を調査する.
  • 地球周辺の小惑星の起源と構成を決定する.
  • NEAのための小惑星帯内の潜在的な源地域を特定する.

主な方法:

  • 地球近傍小惑星のスペクトル分析.
  • NEAのスペクトル特性を,既知の隕石クラスと比較した結果.
  • 類似のスペクトル特性を持つ小惑星ファミリーを特定する.

主要な成果:

  • PHAを含むほとんどのNEAは,LLコンドライト隕石に似たスペクトル特性を示しています.
  • フローラ系小惑星は,類似のスペクトル特性を示し,NEAの発生源である可能性を示している.
  • LLコンドライトのようなNEAの流行は,その希少性 (約. 隕石の落下の8%).

結論:

  • 近地小惑星は主にFLORAファミリーに由来し,LLコンドライトとスペクトル的に類似しています.
  • LLコンドライトのようなNEAの驚くべき豊富さは,ヤルコフスキー効果のようなサイズに依存する輸送メカニズムによって説明され得る.
  • 主帯から地球周辺への小惑星輸送のダイナミクスを完全に理解するためには,さらなる研究が必要である.