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相关概念视频

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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相关实验视频

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

低噪音电流放大器基于介视的约瑟夫森结节.

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
概括

研究人员使用约瑟夫森连接开发了新的布洛赫振荡晶体管,实现了量子电子显著的电流增益和低噪声温度. 这些设备为低温,低噪音电路提供了有希望的构建模块.

科学领域:

  • 量子电子学 量子电子学
  • 介面镜物理学的物理
  • 超导电性 超导电性 超导电性

背景情况:

  • 约瑟夫森交点表现出独特的量子动力学,包括层间过渡和库伦堡封锁.
  • 这些特性可以用于新型电子设备.
  • 开发低噪声放大器对于敏感测量和量子信息处理至关重要.

研究的目的:

  • 为了构建低噪声放大器使用带结构的介视约瑟夫森连接.
  • 创建类似晶体管的设备,称为布洛赫振荡晶体管,具有增强的增益和阻抗.
  • 探索这些设备作为量子电子构建块的潜力.

主要方法:

  • 利用约瑟夫森连接的量子动力学,特别是层间过渡和库珀对库伦封锁的相互作用.
  • 设计和制造由单电子基流控制的晶体管类设备.
  • 描述制造设备的电流增益,功率增益和噪声温度.

主要成果:

  • 取得了相当大的电流增益 (约为30) 和功率增益 (约为5).
  • 证明了类似晶体管的行为,库珀对超流由单电子基流控制.
  • 估计噪声温度约为1凯尔文,潜在<0.1凯尔文.

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Pupillometry to Assess Auditory Sensation in Guinea Pigs
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Pupillometry to Assess Auditory Sensation in Guinea Pigs

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Last Updated: Jul 7, 2026

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

  • 布洛克振荡晶体管提供显著的电流增益和高输入阻抗.
  • 这些设备作为有价值的量子电子构建块,用于低温,低噪声电路应用.
  • 证明的低噪声温度和增强特征对推进敏感电子系统充满希望.