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関連する概念動画

Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

5.9K
A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the  symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
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Capacitor With A Dielectric01:18

Capacitor With A Dielectric

4.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.0K
Capacitors01:15

Capacitors

515
Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...
515
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

931
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
931
Series and Parallel Capacitors01:14

Series and Parallel Capacitors

5.9K
Capacitors, fundamental components in electronic circuits, can be connected in series and/or parallel configurations. Each configuration has different impacts on the overall behavior of the circuit.
First, consider capacitors connected in series to a battery. In this configuration, the plate connected to the battery's positive terminal develops a positive charge, while the plate attached to the negative terminal becomes negatively charged. An equal magnitude of charge is induced on the...
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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

4.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures
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構造的に統合された3Dカーボン管のグリッドベースの高性能フィルターコンデンサ

Fangming Han1, Ou Qian1,2, Guowen Meng1,2

  • 1Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Science (New York, N.Y.)
|August 25, 2022
PubMed
まとめ

カーボン管のグリッドを使って 洗練された二重層の電容器を開発しました これらは高容量で迅速な応答で,小型化されたフィルターと電源装置を可能にします.

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Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
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Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
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科学分野:

  • 材料科学
  • 電気工学
  • 電気化学

背景:

  • フィルターコンデンサは,電子機器の信頼性にとって極めて重要です.
  • 伝統的なアルミニウム電解電容器は,小型化を阻害する大容量です.
  • 電気双層コンデンサは高容量であるが,周波数応答が遅い.

研究 の 目的:

  • 高容量と高速周波数応答を持つ小型化されたフィルターコンデンサを開発する.
  • フィルタリング用途の既存の電気二層電容器の限界を克服する.

主な方法:

  • 相互接続された構造的に統合された炭素管のグリッドベースの電気二層電容器の製造.
  • 面積容量と周波数応答の特徴づけ
  • 120ヘルツの電圧信号に対するラインフィルタリング性能の試験.

主要な成果:

  • 開発されたコンデンサで高い面積容量と高速周波数応答を達成しました.
  • 120ヘルツの電圧信号の 優れたフィルタリングを証明した.
  • 低電圧での体積上の優位性を示した.

結論:

  • 開発された炭素管のグリッドベースの電気二層電容器は,小型化されたフィルターおよび電源装置に適しています.
  • これらのコンデンサは,デジタル回路,ポータブル電子機器,電気器具の実行可能な解決策を提供します.
  • ミニチュア化されたエネルギー貯蔵の将来の進歩のための技術的基盤を提供します.