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Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...

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関連する実験動画

Updated: May 19, 2026

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria
05:52

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria

Published on: June 28, 2018

輝く超新星です.

Avishay Gal-Yam1

  • 1Department of Particle Physics and Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100, Israel. avishay.gal-yam@weizmann.ac.il

Science (New York, N.Y.)
|August 28, 2012
PubMed
まとめ
この要約は機械生成です。

超明るい超新星 (SLSNe) は,非常に明るい恒星爆発である. 最近の研究では,それらの巨大な明るさの起源を理解し,それらを水素が少ないSLSN-I.のようなタイプに分類することに焦点を当てています.

さらに関連する動画

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)
07:04

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)

Published on: May 23, 2014

Bioluminescence-Based Tumor Quantification Method for Monitoring Tumor Progression and Treatment Effects in Mouse Lymphoma Models
07:12

Bioluminescence-Based Tumor Quantification Method for Monitoring Tumor Progression and Treatment Effects in Mouse Lymphoma Models

Published on: July 7, 2016

関連する実験動画

Last Updated: May 19, 2026

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria
05:52

In Situ Measurement and Correlation of Cell Density and Light Emission of Bioluminescent Bacteria

Published on: June 28, 2018

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)
07:04

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)

Published on: May 23, 2014

Bioluminescence-Based Tumor Quantification Method for Monitoring Tumor Progression and Treatment Effects in Mouse Lymphoma Models
07:12

Bioluminescence-Based Tumor Quantification Method for Monitoring Tumor Progression and Treatment Effects in Mouse Lymphoma Models

Published on: July 7, 2016

科学分野:

  • 天文学と天体物理学について
  • コスミック・エクスプロージョン (宇宙の爆発)

背景:

  • 超新星,あるいは恒星爆発は,何世紀にもわたって観測されてきました.
  • 超輝かしい超新星 (SLSNe) は,最近文書化されたサブクラスで,輝度が毎秒7×1043エルグを超えている.
  • SLSNeは,放射性燃料 (SLSN-R),水素豊富な (SLSN-II) および水素の少ない (SLSN-I) タイプに分類されます.

研究 の 目的:

  • SLSNe.の極度の明るさの物理的な起源を調査する.
  • SLSNe.に関する現在の研究の包括的な概要を提供するため.

主な方法:

  • 蓄積された観察証拠と理論モデルのレビュー.
  • SLSNeの分類は,スペクトル特性 (水素存在) と光度に基づいています.

主要な成果:

  • SLSN-I (水素に乏しい) は,最も明るいクラスを表しています.
  • SLSN-IIとSLSN-Iは,SLSN-R.より頻繁に観察されています.
  • SLSNeの明るさを駆動する物理的メカニズムは,依然として研究の対象となっている.

結論:

  • SLSNeの多様な起源を理解することは,天体物理学にとって極めて重要です.
  • これらの宇宙現象の極端なエネルギー出力を完全に説明するには,さらなる研究が必要です.