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相关概念视频

Ratio Level of Measurement00:54

Ratio Level of Measurement

20.7K
The way a set of data is measured is called its level of measurement. Correct statistical procedures depend on a researcher being familiar with levels of measurement. For analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
A set of data measured using the ratio scale takes care of the ratio problem and provides complete information. Ratio scale data are like interval scale data, except they have a zero point and ratios can be calculated....
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Ordinal Level of Measurement00:55

Ordinal Level of Measurement

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The way a set of data is measured is called its level of measurement. Correct statistical procedures depend on a researcher being familiar with levels of measurement. For analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
Data measured using an ordinal scale are similar to nominal scale data, but there is one major difference. The ordinal scale data can be ordered. An example of ordinal scale data is a list of the top five national parks...
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Interval Level of Measurement00:55

Interval Level of Measurement

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For effective statistical analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
Data measured using the interval scale are similar to ordinal level data because they have a definite arrangement. However, in the interval level of measurement, the differences between data values are meaningful even though the data does not have a starting point.
Temperature is measured using the interval scale. It is measurable data, and the difference between...
18.1K
Nominal Level of Measurement00:56

Nominal Level of Measurement

37.1K
The way a set of data is measured is called its level of measurement. Correct statistical procedures depend on a researcher being familiar with levels of measurement. Not every statistical operation can be used with every set of data. For analysis, data are classified into four levels of measurement—nominal, ordinal, interval, and ratio.
The data that cannot be measured but can be grouped into categories fall under the nominal level of measurement. Data that is measured using a nominal...
37.1K
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
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Picometer-Precision Atomic Position Tracking through Electron Microscopy
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电子显微镜测量皮科米级扭曲诱导的局部声子在一个缺陷.

Bo Han1,2, Ruochen Shi1,2, Huining Peng3

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.

Nano letters
|January 20, 2026
PubMed
概括

酸 (SrTiO3) 膜中的缺陷会产生新的声模式. 这些缺陷模式对结构变化敏感,影响电气性能,并为热电设备提供洞察力.

关键词:
抗相边界 (APB) 是一个前相边界.缺陷的声子是缺陷的声子.电子能量损失光谱学 (EELS) 是一种电子能量损失光谱技术.电子显微镜的电子显微镜在SrTiO3O3中使用.

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Correlative Super-resolution and Electron Microscopy to Resolve Protein Localization in Zebrafish Retina
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Correlative Super-resolution and Electron Microscopy to Resolve Protein Localization in Zebrafish Retina
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 氧化物的缺陷往往表现出与局部格子动态相关的独特特性.
  • 了解这些缺陷引起的现象对于先进的材料应用至关重要.

研究的目的:

  • 直接测量SrTiO3独立膜中的反相边界 (APB) 的声子模式.
  • 为了将这些声模式与原子级结构扭曲相关联.
  • 为了阐明这些扭曲对材料性质的影响.

主要方法:

  • 利用原子空间分辨率技术来测量音声模式.
  • 研究了一种SrTiO3独立膜中的反相边界 (APB).
  • 与皮科米特级结构扭曲相关的测量声模式.

主要成果:

  • 发现了SrTiO3 APB独有的新缺陷声模式,不存在于散装SrTiO3.
  • 观察到,这些模式对微妙的结构扭曲非常敏感.
  • 发现SrTiO3 APB产生局部电偶极,形成反铁电构造.
  • 由于这些双极,横向光学 (TO) 和纵向光学 (LO) 模式频率的显著变化已被证明.

结论:

  • 这项研究提供了SrTiO3 APB中缺陷声模式的直接证据.
  • 与结构扭曲相关的局部声子提供了对复杂氧化物缺陷特性的洞察.
  • 这些发现对于优化应用至关重要,特别是在热电设备中.