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相关概念视频

Elements and Compounds01:27

Elements and Compounds

105.3K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
Elements
Elements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...
105.3K
Periodic Classification of the Elements04:00

Periodic Classification of the Elements

59.6K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
59.6K
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

127.0K
A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
127.0K
Line Loss01:10

Line Loss

545
The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
545
Classification of Elements and Compounds02:54

Classification of Elements and Compounds

73.4K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
73.4K
Standard Entropy Change for a Reaction03:00

Standard Entropy Change for a Reaction

24.9K
Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
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相关实验视频

Updated: Feb 11, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

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基本相变材料用于可扩展的超低损耗可编程光子学.

Wentao Huang1, Hu Wang1, Shanshan Wang1

  • 1College of Integrated Circuits & Micro-Nano Electronics, Fudan University, Shanghai, China.

Advanced materials (Deerfield Beach, Fla.)
|February 10, 2026
PubMed
概括
此摘要是机器生成的。

元素薄膜为可重新配置的光子学提供了一个简单,可扩展的解决方案. 这些薄膜为先进的轻质控制应用提供了出色的光学性能和稳定性.

关键词:
基本的相变材料.低损耗材料是一种低损耗材料.程序 杂的光子学是一种.

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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Using Synthetic Biology to Engineer Living Cells That Interface with Programmable Materials
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相关实验视频

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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科学领域:

  • 材料科学 材料科学 材料科学
  • 光子学 是一个光子学.
  • 光学是什么?光学是什么?光学是什么?

背景情况:

  • 炭化物相变材料 (PCM) 对于可重新配置的光学至关重要,它可以控制非挥发性轻质物质.
  • 现有的复杂PCM在统一的制造和切换稳定性方面面临挑战,尽管提供低损失的仅相位调制.

研究的目的:

  • 为高性能可编程光子引入一个基本的,可扩展的相变材料.
  • 为了证明 (Se) 薄膜在先进光学应用中的潜力.

主要方法:

  • 制造晶圆尺度 (8英寸) 薄膜.
  • 光学属性的表征,包括透明度,损耗和折射率切换 (Δn).
  • 在100万 (10^6) 个周期内评估切换稳定性.
  • 了解折射率切换机制的第一原则计算.
  • 展示了一种可激光重新配置的图像生成和光束转换平台.

主要成果:

  • 实现了前所未有的统一性和近红外完全透明度,在可见光谱中损失超低.
  • 证明了高的开关稳定性,能够维持10^6个可逆周期而不降解.
  • 观察到一个巨大的折射率切换 (Δn ≈ 0.6) 归因于Se螺旋链动态.
  • 成功实现了一个可制造的,用于动态光学功能的无蚀刻平台.

结论:

  • 元素薄膜为复杂的PCM提供了一个有希望的,可扩展的替代方案,用于可重新配置的光子学.
  • Se的独特特性使得高性能,设备级可编程光子设备的新范式成为可能.
  • 这种基本的方法使原子的简单性与先进光学应用的设备可扩展性相协调.