関連する実験動画
Updated: Jan 8, 2026

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.6K
パルサーにおけるラジオ波の生成
1University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank.
Nature
|December 5, 1970
まとめ
パルサーは,未知のメカニズムで強力なラジオ波を発射し,宇宙で最も明るい放射線を生成します. この記事では,いかなる科学理論も説明しなければならないパルサー放射の観測可能な特徴を詳細に説明します.
科学分野:
- 天体物理学 天体物理学
- ラジオ天文学 ラジオ天文学
背景:
- パルサーは,電磁放射線の束を放射する,高度に磁気化された回転中性子星です.
- パルサーのラジオ発射メカニズムは,天体物理学で最も重要な未解決問題の1つである.
- パルサーの放射は,他のすべての既知の天体物理学的源を超えて,非常に高い体積放射性を表しています.
研究 の 目的:
- パルサーのラジオ放出に関する重要な観測事実をまとめ,提示する.
- 成功した排出理論が説明しなければならない特性の包括的な概要を提供すること.
主な方法:
- パルサーの無線放射に関する確立された観測データをまとめました.
- 幅と極化を含む放射線束の性質の分析.
- パルサービームの周波数独立特性に関するレビュー.
主要な成果:
- パルサー電波放射ビームは,周波数に関して不変な幅と偏りを持っています.
- パルサーの観測された放射性は,天体物理学現象で知られている中で最も高いものです.
- パルサー放射理論のための一貫した観測制約のセットが組み立てられました.
結論:
- パルサーの放射放射の基本的な過程を理解することは,天体物理学にとって極めて重要です.
- 収集された観測事実は,パルサー放射の理論的モデルを検証するための重要な基準として機能します.
関連する概念動画
Generating Electromagnetic Radiations
6.6K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
6.6K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
1.6K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.6K
Atomic Nuclei: Larmor Precession Frequency
2.6K
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,...
2.6K
Propagation Speed of Electromagnetic Waves
4.6K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.6K
Electromagnetic Waves
10.9K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
10.9K
Atomic Nuclei: Nuclear Relaxation Processes
1.2K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
1.2K

