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相关概念视频

Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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...
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An unbiased ADMM-TGV algorithm for the deconvolution of STEM-EELS maps.

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High-Throughput Analysis of Optical Mapping Data Using ElectroMap
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一个应用噪声模型用于低损失的EELS地图.

Christian Zietlow1, Jörg K N Lindner1

  • 1Nanopatterning-Nanoanalysis-Photonic Materials Group, Department of Physics, Paderborn University, Warburgerstr. 100, Paderborn, 33098, Germany.

Ultramicroscopy
|January 17, 2025
PubMed
概括

在电子能量损失光谱学 (EELS) 中理解噪声至关重要. 本研究提供了一个噪声模型和方法来描述噪声参数,以改善扫描传输电子显微镜 (STEM) EELS数据质量.

科学领域:

  • 材料科学 材料科学 材料科学
  • 分析化学 分析化学
  • 物理 物理学 物理

背景情况:

  • 在扫描传输电子显微镜 (STEM) 中的电子能量损失光谱 (EELS) 容易产生噪声和信号模糊.
  • 检测器点传播函数 (PSF) 引入了平滑噪声的相关性,影响了数据质量.
  • 准确的噪声评估对于解卷和改善EELS信号增强至关重要.

研究的目的:

  • 提供对噪声平滑和EELS相关性的理论见解.
  • 在EELS映射中调查能量漂移和光束电流偏差效应.
  • 为EELS测量开发一种实用的应用噪声模型.

主要方法:

  • 应用噪声模型的数学推导用于EELS.
  • 使用皮尔森系数来描述噪声相关性.
  • 对EELS映射的能量调整和强度规范化技术的研究.

主要成果:

  • 在EELS中通过卷积平滑噪声的理论理解.
  • 在EELS探测器数据中量化噪声相关性.
  • 证明能量漂移校正和光束电流正常化对噪声的影响.
关键词:
EELS探测器的检测器的地图 的地图噪音模型的模型噪声参数 噪声参数点差函数 EELS 的点差函数在 ZLP 调整对齐.

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结论:

  • 提供了对EELS噪声的全面理解.
  • 对于EELS数据,一个简单的应用噪声模型被推导出来.
  • 为用户提供了确定EELS探测器噪声参数的方法.