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相关概念视频

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.
Electromagnetic Waves01:30

Electromagnetic Waves

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 of electricity and...
Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
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...
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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.

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相关实验视频

Updated: Jul 12, 2026

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

一个洲际阵列 - - 一个下一代无线电望远镜.

G W Swenson, K I Kellermann

    Science (New York, N.Y.)
    |June 27, 1975
    PubMed
    概括

    建造一个非常长的基线阵列 (VLBA) 是可行的,耗资约2000万美元. 这个洲际射电望远镜阵列将为天文学研究提供前所未有的角度分辨率.

    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
    • 仪器工程 仪器工程是指仪器工程.

    背景情况:

    • 估计大型科学仪器的成本是一项挑战.
    • 非常长基线阵列 (VLBA) 的许多组件已经存在或正在制造中.
    • 非常大的阵列 (VLA) 目前正在建设中.

    研究的目的:

    • 估计一个洲际非常长基线阵列 (VLBA) 的建设成本.
    • 评估在无线电天文学中实现小于百万秒分辨率的可行性.
    • 要确定这样的仪器在成本上是否与现有的大型射电望远镜相美.

    主要方法:

    • 基于现有和制造的部件 (天线,电子系统) 的成本估计.
    • 包括辐射计,频率标准,计算机,录音机和播放设备的成本.
    • 考虑使用地球静止通信卫星进行数据传输的替代设计.

    主要成果:

    • 使用磁带录音机的十元VLBA的估计成本约为2000万美元.
    • 采用卫星数据传输的替代设计将额外花费3000万至5000万美元.
    • 总成本相当于现有的大型射电望远镜和阵列.

    更多相关视频

    Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
    07:14

    Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

    Published on: May 1, 2018

    相关实验视频

    Last Updated: Jul 12, 2026

    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

    Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
    07:14

    Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

    Published on: May 1, 2018

    结论:

    • 在合理的成本下建造一个洲际VLBA是可行的.
    • 该VLBA将提供亚百万秒分辨率,补充VLA.
    • 这一进步将使宇宙的研究具有前所未有的角度分辨率.