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

Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
The Antenna Complex01:15

The Antenna Complex

Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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 Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.

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

Changes in Surgical Pathology Case Volume and Amendment Rates During the COVID-19 Pandemic.

American journal of clinical pathology·2022
Same author

Kidney tubule health scores and their associations with incident CKD in women living with HIV.

HIV medicine·2021
Same author

Feasibility and Acceptability of a Program to Promote Positive Affect, Well-Being and Gender Empowerment in Black Women Living with HIV.

AIDS and behavior·2021
Same author

Pharmacogenetic Associations with ADME Variants and Virologic Response to an Initial HAART Regimen in HIV-Infected Women.

International journal of HIV/AIDS and research·2018
Same author

Relation of HLA class I and II supertypes with spontaneous clearance of hepatitis C virus.

Genes and immunity·2013
Same author

Exercise performance comparison of bicaval and biatrial orthotopic heart transplant recipients.

Transplantation proceedings·2011

相关实验视频

Updated: Jul 12, 2026

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
11:27

Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

Published on: December 8, 2016

无线电源:从闪光研究中得出的角大小.

M H Cohen, E J Gundermann, H E Hardebeck

    Science (New York, N.Y.)
    |August 12, 1966
    PubMed
    概括

    星际闪分析为估计无线电源直径提供了一种敏感的方法. 这种技术实现了比无线电干扰测量或月球遮蔽更高的分辨率,用于像3C 138和3C 273这样的来源.

    科学领域:

    • 天文学和天体物理学
    • 无线电天文学 无线电天文学

    背景情况:

    • 估计银河系外无线电源的角径对于理解它们的物理性质至关重要.
    • 以前的方法,如无线电干扰测量和月球遮蔽,在分辨率上有局限性.

    研究的目的:

    • 调查行星间闪 (IPS) 的潜力,以测量紧无线电源的角大小.
    • 将IPS实现的分辨率与现有技术进行比较.

    主要方法:

    • 分析星际闪引起的波动的频谱.
    • 使用IPS进行特定无线电源 (3C 138,3C 245,3C 267,3C 273) 的观测.

    主要成果:

    • 为3C 138 (0.1弧秒),3C 245 (<=0.04弧秒),3C 267 (<=0.2弧秒) 和3C 273 (<=0.02弧秒) 确定了角径.
    • 实现的分辨率至少比以前的无线电干扰仪或月球遮蔽的分辨率高五倍.

    结论:

    • 星际闪为估计无线电源直径提供了一种敏感和高分辨率的方法.
    • IPS技术在解决无线电源中的小角度结构方面取得了重大进展.

    更多相关视频

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
    06:14

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

    Published on: July 30, 2020

    Scattering And Absorption of Light in Planetary Regoliths
    11:34

    Scattering And Absorption of Light in Planetary Regoliths

    Published on: July 1, 2019

    相关实验视频

    Last Updated: Jul 12, 2026

    Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
    11:27

    Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2

    Published on: December 8, 2016

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
    06:14

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

    Published on: July 30, 2020

    Scattering And Absorption of Light in Planetary Regoliths
    11:34

    Scattering And Absorption of Light in Planetary Regoliths

    Published on: July 1, 2019