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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...
X-ray Imaging01:24

X-ray Imaging

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 X-rays, and by 1900, X-ray was widely...
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...
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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 the...
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.
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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関連する実験動画

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

6センチメートルの深さの無線源調査です.

E B Fomalont, K I Kellermann, J V Wall

    Science (New York, N.Y.)
    |July 6, 1984
    PubMed
    まとめ
    この要約は機械生成です。

    Very Large Array (VLA) は,以前よりも100倍弱く,弱々しい無線源を検出しました. これらの源は主に淡い銀河であり,宇宙ラジオ放射に関する新しい洞察を示唆しています.

    さらに関連する動画

    A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
    14:19

    A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

    Published on: February 1, 2016

    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

    関連する実験動画

    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

    A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
    14:19

    A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

    Published on: February 1, 2016

    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

    科学分野:

    • ラジオ天文学 ラジオ天文学
    • 銀河外天文学 銀河外天文学

    背景:

    • 以前のラジオ天文学の調査は,弱々しいラジオ源を検出する上で制限がありました.
    • 微弱な無線源の集団を理解することは,宇宙学にとって極めて重要です.

    研究 の 目的:

    • 前例のない感度で6センチの波長で空の領域を調査する.
    • マイクロジャンスキー流動密度で,ラジオ銀河の源数を調査する.

    主な方法:

    • Very Large Array (VLA) を利用して深層無線連続観測を行った.
    • 完全性の限界60microjanskysを達成し,以前の調査よりもかなり深い.

    主要な成果:

    • 検出された無線源は,以前に検出された限界値より約100倍弱かった.
    • 観測されたソースカウントは,より低い周波数に似たように収束し,潜在的超過は100microjanskys.以下です.
    • 検出されたソースのほとんどを淡い銀河として特定しました.

    結論:

    • Very Large Arrayは,より深い無線調査を可能にし,より多くの無線電源を明らかにします.
    • 非常に淡い光源の過剰は,以前は特徴づけられていなかった放射性銀河の集団を示唆する可能性があります.
    • これらの発見は,銀河の進化と宇宙ラジオの背景についての私たちの理解に貢献します.