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相关概念视频

Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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...
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...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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...

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相关实验视频

Updated: Jul 1, 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

这是一个超新星1987A!

S E Woosley, M M Phillips

    Science (New York, N.Y.)
    |May 6, 1988
    PubMed
    概括
    此摘要是机器生成的。

    1987年的超新星是近400年来最亮的,为大质量恒星死亡提供了前所未有的洞察力. 来自各种探测器的观测证实了许多理论,但也揭示了关于这个宇宙事件的迷人惊喜.

    更多相关视频

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
    10:52

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

    An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
    07:48

    An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

    Published on: June 18, 2020

    相关实验视频

    Last Updated: Jul 1, 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

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
    10:52

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

    An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
    07:48

    An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

    Published on: June 18, 2020

    科学领域:

    • 天文学和天体物理学
    • 太空爆炸 太空爆炸
    • 恒星进化 恒星进化

    背景情况:

    • 近400年来最亮的超新星,SN 1987A,发生在大麦哲伦云中.
    • 它相对靠近 (16万光年) 能够进行详细,新的观测.
    • 超新星代表大质量恒星的暴力死亡,这是宇宙的一个关键过程.

    研究的目的:

    • 为了利用SN 1987A.提供的独特的观测机会.
    • 增强对控制大质量恒星死亡的物理学的理解.
    • 将观测数据与超新星的理论模型进行比较.

    主要方法:

    • 从太空,地面探测器,气球和飞机进行多波长观测.
    • 使用地下深层探测器检测中微子.
    • 分析光曲线和光谱数据,以了解能量释放和组成.

    主要成果:

    • 证实了许多关于超新星机制的理论预期.
    • 检测中微子提供了核心崩过程的直接证据.
    • 意想不到的观测数据挑战了一些现有模型,突出了新的现象.

    结论:

    • SN 1987A显著提升了我们对恒星死亡和超新星物理学的理解.
    • 该活动强调了多信使天文学 (光和中微子) 的重要性.
    • 来自SN 1987A的惊喜继续推动天体物理学中的理论和观测研究.