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関連する概念動画

Electric Generator: Alternator01:25

Electric Generator: Alternator

Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
Energy Losses in Transformers01:21

Energy Losses in Transformers

In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the copper windings...
Bridge rectifier01:24

Bridge rectifier

The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
Clamper Circuit01:14

Clamper Circuit

A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to conduct,...
Voltage Doubler Circuit01:23

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
Generator Voltage Control01:21

Generator Voltage Control

Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...

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関連する実験動画

Updated: Jul 7, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

メソスコピックジョセフソン交差点に基づく低騒音電流増幅器.

J Delahaye1, J Hassel, R Lindell

  • 1Low Temperature Laboratory, Helsinki University of Technology, Post Office Box 2200, 02015 HUT, Finland.

Science (New York, N.Y.)
|February 15, 2003
PubMed
まとめ

研究者らは,ジョセフソン・ジャンクションを用いた新しいブロッホ振動トランジスタを開発し,量子エレクトロニクスのための大きな電流増強と低騒音温度を達成しました. これらのデバイスは,低温,低騒音回路のための有望な構成要素を提供します.

科学分野:

  • 量子エレクトロニクスとは
  • メソスコプ物理学のメソスコプ物理学
  • 超伝導性は超伝導性である.

背景:

  • ジョセフソン交差点は,レベル間の移行やクーロンブブロックを含むユニークな量子ダイナミクスを示しています.
  • これらの特性は,新しい電子機器に活用することができます.
  • 低騒音増幅器の開発は,繊細な測定と量子情報処理に不可欠です.

研究 の 目的:

  • メソスコピックジョセフソン結合の帯域構造を用いた低騒音増幅器を構築する.
  • トランジスタのような装置,ブローチ振動トランジスタと呼ばれる,強化された増益と阻力を持つデバイスを作成する.
  • 量子電子の構成要素としてこれらのデバイスの潜在能力を探求する.

主な方法:

  • ジョセフソン・ジャンクションの量子ダイナミクスを利用し,特にレベル間の移行とクーパー・ペア・クーロンブ・ブロックの相互作用.
  • シングル電子ベース電流で制御されるトランジスタ型のデバイスの設計と製造.
  • 製造されたデバイスの電流増益,電力増益,およびノイズ温度を特徴づける.

主要な成果:

  • 相当な電流増益 (約30倍) と電力増益 (約5倍) を達成しました.
  • クーパーペア超電流が単一電子ベース電流によって制御されるトランジスタのような振る舞いを実証した.

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Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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関連する実験動画

Last Updated: Jul 7, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

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  • 推定騒音温度は約1ケルビンで,<0.1ケルビンになる可能性があります.

    • 結論:

    • ブロック振動トランジスタは,大きな電流増強と高入力インペダンスを提供します.
    • これらのデバイスは,低温,低騒音回路アプリケーションのための貴重な量子電子構成要素として機能します.
    • 証明された低騒音温度と増強特性は,繊細な電子システムの進歩に有望である.