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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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.
Half wave rectifier01:20

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
Clipper Circuit01:18

Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
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.

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相关实验视频

Updated: Jul 6, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

一个门控制的双向旋转波器,使用量子连贯性.

J A Folk1, R M Potok, C M Marcus

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA. jfolk@stanford.edu

Science (New York, N.Y.)
|February 1, 2003
PubMed
概括
此摘要是机器生成的。

我们使用量子点和磁场开发了一种量子连贯电子自旋波器. 该装置通过电气控制并检测高极化率高达70%的自旋极化电流.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

相关实验视频

Last Updated: Jul 6, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

科学领域:

  • 量子物理学的量子物理学
  • 凝聚物质物理学 凝聚物质物理学
  • 这就是Spintronics.

背景情况:

  • 电子自旋两极化对于量子技术至关重要.
  • 目前用于旋转操纵的方法往往缺乏完全的电气控制.

研究的目的:

  • 为了展示一个新的量子连贯电子自旋波器.
  • 为了实现全电控制和检测自旋极化电流.

主要方法:

  • 利用一个开放的量子点,将其置于平面内磁场中.
  • 利用了自旋依赖的量子干扰和网关电压调节.
  • 直接测量了发射电流的自旋偏振.

主要成果:

  • 通过控制的费米波长实现了自旋依赖的量子干扰.
  • 证明了优先传输的旋转的电选择.
  • 观察到高电流极化,高达70%的两个旋转方向.

结论:

  • 开发的设备作为一个有效的量子连贯电子旋转波器.
  • 本文介绍了一种完全电气化的方法,用于创建和检测自旋极化电流.
  • 观测到的高极化值对旋转子应用有很大的前景.