Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Detection of Black Holes01:10

Detection of Black Holes

2.6K
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...
2.6K
Emission Spectra02:39

Emission Spectra

78.8K
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.
78.8K
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

4.3K
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...
4.3K
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

8.5K
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...
8.5K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.6K
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.
1.6K
X-ray Imaging01:24

X-ray Imaging

11.1K
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
11.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

ASCEND: a randomised, double-blinded, placebo-controlled, phase II study of gemcitabine and nab-paclitaxel with LSTA1 in untreated metastatic pancreatic adenocarcinoma. An Australasian Gastro-Intestinal Trials Group (AGITG) trial.

ESMO gastrointestinal oncology·2026
Same author

Rucaparib maintenance for newly diagnosed advanced ovarian cancer: interim overall survival, progression-free survival, and safety at 5 years of follow-up from the phase III ATHENA-MONO/GOG-3020/ENGOT-ov45 study.

Annals of oncology : official journal of the European Society for Medical Oncology·2025
Same author

Mortality and Major Amputation in Patients With Diabetes-Related Foot Ulcers and Chronic Renal Disease.

ANZ journal of surgery·2025
Same author

Provenance of late Pleistocene loess in central and eastern Europe: isotopic evidence for dominant local sediment sources.

Scientific reports·2025
Same author

Early onset metastatic colorectal cancer in Australia.

Cancer treatment and research communications·2024
Same author

Using morphometrics to identify sex in the eastern blue-tongued skink (Tiliqua scincoides).

Australian veterinary journal·2023

相关实验视频

Updated: Apr 1, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

13.4K

作为银河系软玛射线发射的起源的紧源.

F Lebrun1, R Terrier, A Bazzano

  • 1CEA-Saclay, DAPNIA/Service d'Astrophysique, F91191 Gif sur Yvette Cedex, France. flebrun@cea.fr

Nature
|March 19, 2004
PubMed
概括

新的观测揭示了许多紧的来源主导银河系的软马射线辐射. 这些发现表明点源,而不是分散的星际过程,是这种高能光的主要来源.

更多相关视频

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

22.6K
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

15.7K

相关实验视频

Last Updated: Apr 1, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

13.4K
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

22.6K
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

15.7K

科学领域:

  • 天体物理学 天体物理学
  • 高能天体物理学 高能天体物理学
  • 银河系天文学 银河系天文学

背景情况:

  • 银河系是马射线光子的重要来源,以前认为它们主要是分散的,来自星际过程.
  • 由于观测的局限性,估计点源对软马射线辐射的贡献是具有挑战性的.
  • 现有的模型很难解释银河系中观察到的强烈的扩散马射线辐射.

研究的目的:

  • 为了调查银河系软玛射线辐射的起源.
  • 为了确定银河系中占主导地位的粒子加速过程.
  • 通过马射线观测了解星际介质的物理和化学平衡.

主要方法:

  • 利用柔软的马射线领域的敏感,高分辨率的观测.
  • 分析数据以识别和描述紧的马射线源.
  • 将已识别的源流与银河系总马射线辐射的流量进行比较.

主要成果:

  • 在银河系的柔软马射线光谱中检测到了许多紧的光源.
  • 发现这些紧的光源占据了观察到的整个柔软马射线辐射.
  • 扩散过程似乎在银河系的柔软马射线预算中只发挥了微不足道的作用.

结论:

  • 银河系软马射线发射的主要来源是紧的天体物理源.
  • 这些发现需要对粒子加速和星际介质相互作用的模型进行重新评估.
  • 未来的研究应该集中在这些新发现的紧源的性质和贡献上.