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Fischer Projections02:18

Fischer Projections

Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
Gauss's Law: Planar Symmetry01:27

Gauss's Law: Planar Symmetry

A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Parallel-Axis Theorem for an Area01:12

Parallel-Axis Theorem for an Area

The moment of inertia is a fundamental concept in mechanical engineering that plays a significant role in designing rotationally symmetric objects such as flywheels, gears, and other mechanical systems. In this context, we will discuss the moment of inertia of a flywheel rotating about its centroidal axis and how it relates to the moment of inertia about an axis parallel to it.
For a flywheel approximated as a solid disc, consider an infinitesimal differential element with an arbitrary distance...
Interpretations of Partial Derivatives01:14

Interpretations of Partial Derivatives

A surface defined by a function of two variables can be visualized as a vast, uneven terrain, where each point is identified using Cartesian coordinates. The elevation of the terrain at any point is determined by a function that assigns a height value to every pair of horizontal coordinates. This representation allows the surface to be studied in terms of how its height varies across different directions.At a specific point on this terrain, understanding how the height changes requires...

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Updated: Jul 10, 2026

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

Altairの表面を画像化しています.

John D Monnier1, M Zhao, E Pedretti

  • 1Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA. monnier@umich.edu

Science (New York, N.Y.)
|June 2, 2007
PubMed
まとめ

高度なインターフェロメトリーを用いてアルテイア星を画像化し,急速な回転による表面の歪みを明らかにしました. 標準モデルは観測された重力の暗くなることを説明できず,複雑な回転パターンを示唆しました.

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Last Updated: Jul 10, 2026

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10:35

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Published on: February 12, 2013

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Published on: September 17, 2019

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科学分野:

  • * 天体物理学
  • * 恒星物理学について
  • * 光学インターフェロメトリー

背景:

  • * 恒星の表面を理解することは,恒星物理学にとって極めて重要です.
  • * 急速に回転する星は,独特の光球特性を発揮します.
  • * 光学的な長ベースライン干渉計は,高解像度の恒星表面イメージングを提供します.

研究 の 目的:

  • * 高解像度近赤外線画像で,急速に回転している恒星アルター (Altair) を撮影した.
  • * 恒星の光球に対する急速な回転の影響を調査する.
  • * 標準的な恒星モデルを観測データと比較してテストする.

主な方法:

  • * 長期ベースラインの光学干渉測定を用いた.
  • * サブミリアルク秒の解像度の画像撮影を達成しました.
  • *近赤外線波長にフォーカスしています.

主要な成果:

  • * 前例のない解像度でAltairの近赤外線画像を生成しました.
  • *明瞭に観測された,恒星の光球全域の重力による有意な暗くなること.
  • * 高度な光球の歪みが検出されました.

結論:

  • * 均等に回転する恒星の標準モデルは,アルテールの観測された表面を説明するのに不十分です.
  • *この発見は,微分回転または非標準の重力暗くする法則の存在を示唆しています.
  • * 星回転と重力暗化モデルを精密にするためにさらなる研究が必要である.