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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...
Rocket Propulsion in Gravitational Field - I01:20

Rocket Propulsion in Gravitational Field - I

Rockets range in size from small fireworks that ordinary people use to the enormous Saturn V that once propelled massive payloads toward the Moon. The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses are explained by the same physical principle: Newton's third law of motion. The matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
The motion of a rocket in space changes its velocity (and hence its...
Rocket Propulsion in Gravitational Field - II01:03

Rocket Propulsion in Gravitational Field - II

A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
A rocket's acceleration depends on three major factors, consistent with the equation for the...
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Momentum And Radiation Pressure01:20

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

変数原星におけるパルス増殖

James Muzerolle1, Elise Furlan, Kevin Flaherty

  • 1Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA. muzerol@stsci.edu

Nature
|January 4, 2013
PubMed
まとめ
この要約は機械生成です。

若い原星は,パルス増殖を示し,これは,変動する増殖率のために周期的に光度が増加する現象です. この研究では, 25.34 日ごとに驚くほど,定期的に 10 倍の赤外線光度が増加するプロトスターを観察しました.

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Last Updated: May 13, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

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Published on: July 2, 2012

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

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科学分野:

  • 天体物理学 天体物理学
  • 恒星の進化について
  • エクソプラネット研究

背景:

  • メインシーケンス前近い二重星は,円盤から物質を蓄積する.
  • 周期的な光度増加によって特徴づけられるパルス増殖は,二重進化と惑星形成に影響を与えます.
  • 収縮の変動性は若い恒星では一般的ですが,周期的なパルス収縮信号は若いバイナリー星ではめったに観測されません.

研究 の 目的:

  • 若い原星における周期的な光度変動を調査する.
  • 観測された変動がパルス増殖と一致するかどうかを判断する.
  • 非常に若い恒星系における強力で規則的なパルス増殖の影響を理解する.

主な方法:

  • 若き原星のマルチエポック赤外線観測.
  • 時間の経過による光度変動の分析.
  • 観測されたパターンとパルス増殖の理論モデルを比較.

主要な成果:

  • 若い原星 (年齢 ~10 ^ 5年) は,約1週間で赤外線光度が10倍に増加しました.
  • この明るさの増加は,驚くべき規則性で25.34日ごとに繰り返された.
  • 観測された現象は,目に見えないバイナリコンパニオンからのパルス増殖に起因する.

結論:

  • 観測されたパルス蓄積信号は,この若い年齢のシステムにとって,異常に強力で規則的です.
  • この発見は,パルス増殖が,近い二重星の初期の進化に重要な役割を果たす可能性があることを示唆しています.
  • 信号の規則性と強さは,以前に研究されたシステムと比較して,原星の非常に若い年齢に関連している可能性があります.