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関連する概念動画

Conductors and Insulators01:19

Conductors and Insulators

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Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
Most metals are conductors. Their atomic configuration is such that one or more electron(s) are loosely bound to the nucleus in each atom. Thus, a sea of mobile electrons are available in them, known as free electrons. Their easy...
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Insulation Coordination01:23

Insulation Coordination

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Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
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Thermal Insulation in Masonry Walls

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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh....
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What is an Experiment?01:12

What is an Experiment?

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An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
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Thomson's e/m Experiment

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In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
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Controls in Experiments

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When conducting an experiment, it is crucial to have control to reduce bias and accurately measure the dependent variables. It also marks the results more reliable. Controls are elements in an experiment that have the same characteristics as the treatment groups but are not affected by the independent variable. By sorting these data into control and experimental conditions, the relationship between the dependent and independent variables can be drawn. A randomized experiment always includes a...
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トポロジカル・アイソレーター・レーザー:実験

Miguel A Bandres1, Steffen Wittek2, Gal Harari1

  • 1Physics Department and Solid State Institute, Technion, Haifa 32000, Israel.

Science (New York, N.Y.)
|February 9, 2018
PubMed
まとめ
この要約は機械生成です。

この研究は,堅固な単一モードレーザリングのための新しいトポロジカル・アイソレーター・システムを導入します. このシステムは磁場なしで効率を上げ,一方向の光を発し,先端のトポロジック装置への道を切り開いています.

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科学分野:

  • 光学について
  • 凝縮物質物理学
  • 材料科学

背景:

  • トポロジカル断熱器は,トポロジカルインヴァリアントにより,堅固な輸送特性を持ち,故障や乱れに耐える.
  • フォトニクスにおけるトポロジック現象の利用は,強固な光学システムの開発に最近焦点を当てている.
  • 現存するトポロジカル・システムは,しばしば磁場を必要とし,実用的なデバイスの応用が欠けている.

研究 の 目的:

  • トポロジカルに保護された輸送を持つ非磁気トポロジカル・アイソレーター・システムを実証する.
  • そのようなシステムのモードの安定性と効率性を含むレーザーの性質を調査する.
  • アクティブ・トポロジカル・プラットホームでの単方向レーシングのためのS-キラルマイクロレゾナーの使用を調査する.

主な方法:

  • 非磁気トポロジカル・アイソレーター・システムの製造
  • S-キラルマイクロレゾナーを使って 単方向の光拡散を設計する.
  • モードスペクトル,欠陥に対する強度,傾斜効率を含むレージング特性の特徴.

主要な成果:

  • トポロジカル・アイソレーター・システムは トポロジカル・プロテクト・トランスポートを示した.
  • シングルモードレージングと欠陥に対する有意な強度が観察されました.
  • このシステムは,トポロジ的に些細な対比と比較して,かなり高い傾斜効率を達成しました.
  • 外部磁場を必要とせず,単方向レーザーを達成しました.

結論:

  • 開発された非磁気トポロジカル・アイソレーター・システムは,堅固なシングルモード・レージングと効率の向上を提供します.
  • S-キラルマイクロレゾナーを使用することで,制御された片方向レージングが可能になり,アクティブトポロジカルプラットフォームの可能性を強調します.
  • この研究は,ユニークな機能を持つ新しいアクティブトポロジックデバイスの開発の道を開きます.