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

Sharpless Epoxidation02:57

Sharpless Epoxidation

The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
Rocket Propulsion in Empty Space - I01:13

Rocket Propulsion in Empty Space - I

The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the rocket's...
Rocket Propulsion In Empty Space - II01:12

Rocket Propulsion In Empty Space - II

The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Preparation of Epoxides03:00

Preparation of Epoxides

Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...

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

Isotopic evidence for a cold and distant origin of 3I/ATLAS.

Nature·2026
Same author

The Lucy flyby of (52246) Donaldjohanson: A bilobed asteroid with tumbling rotation.

Science (New York, N.Y.)·2026
Same author

On-ground calibration and performance evaluation of MMX InfraRed spectrometer (MIRS) for the Martian moon eXploration mission: Setup development, data acquisition, and preliminary results.

The Review of scientific instruments·2026
Same author

Decade of research on insect chitinase inhibitors: insights from molecular structure to biological function.

Bioorganic chemistry·2026
Same author

Spectroscopic insights into the near-earth didymos-dimorphos binary system following the double asteroid redirection test (DART) mission impact.

Nature communications·2025
Same author

The Origins & Reservoirs of Exocomets.

Space science reviews·2025
Same journal

Erratum for the Research Article "Detecting supramolecular organic nanoparticles during heat wave".

Science (New York, N.Y.)·2026
Same journal

Local signals, systemic decline.

Science (New York, N.Y.)·2026
Same journal

The mechanics of liver regeneration.

Science (New York, N.Y.)·2026
Same journal

Computing in a memory with physics.

Science (New York, N.Y.)·2026
Same journal

Retraction.

Science (New York, N.Y.)·2026
Same journal

Making time.

Science (New York, N.Y.)·2026
関連記事をすべて見る

関連する実験動画

Updated: May 31, 2026

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
11:47

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance

Published on: July 4, 2017

EPOXIはハートリー2彗星から観測された.

Michael F A'Hearn1, Michael J S Belton, W Alan Delamere

  • 1Department of Astronomy, University of Maryland, College Park, MD 20742-2421 USA. ma@astro.umd.edu

Science (New York, N.Y.)
|June 18, 2011
PubMed
まとめ
この要約は機械生成です。

EPOXIミッションは彗星103P/ハートリー2を調査し,その活動が二酸化炭素排出によるものであることを明らかにした. この過程で氷塊が放出され,小規模で活発な核全体に多種多様な揮発性成分を示します.

さらに関連する動画

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
12:05

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

関連する実験動画

Last Updated: May 31, 2026

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
11:47

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance

Published on: July 4, 2017

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
12:05

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

科学分野:

  • * 惑星科学 (惑星科学)
  • * 天文学 (アストロノミー)
  • * 彗星科学について

背景:

  • *彗星活動の理解は,初期の太陽系の研究の鍵となる.
  • * 彗星は,太陽系の原始的な物質に関するユニークな洞察を与えてくれます.
  • * EPOXIミッションは,詳細な観測のために彗星103P/ハートリー2を標的にしました.

研究 の 目的:

  • * 小規模で活発な原子核における彗星活動の原動力を調査する.
  • * 彗星103P/ハートリー2の構成と振る舞いを分析する.
  • * 原子核の性質と排出ガスの関係を理解する.

主な方法:

  • * EPOXI宇宙船は,彗星103P/ハートリー2の近くを通過した.
  • *高解像度画像により,彗星の核と活動が記録されました.
  • *スペクトル解析により,彗星の揮発性成分に関するデータが得られた.

主要な成果:

  • *103P/ハートリー2彗星の核は異常に小さいが,非常に活発である.
  • *二酸化炭素 (CO2) 排出は,より大きな彗星とは異なり,活動の主な原動力です.
  • *CO2の亜鉛化により,氷と塵が放出され,ジェットと活動が生じます.
  • * 原子核の異なる領域において,揮発性物質の豊富さの有意な変動が観察されました.

結論:

  • * 小規模で活発な彗星核は,CO2の排出ガスによって支配されることがあります.
  • *彗星の活動メカニズムは,原子核の大きさや構成によって異なります.
  • *この発見は,彗星の進化と太陽系の初期状態についての理解を深める.