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関連する概念動画

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
Speed of a Transverse Wave01:13

Speed of a Transverse Wave

The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Properties of Fourier Transform II01:24

Properties of Fourier Transform II

The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
Electromagnetic Waves01:30

Electromagnetic Waves

James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws of electricity and...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...

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関連する実験動画

Updated: May 10, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

電気通信のデータレートの一時的なマント.

Joseph M Lukens1, Daniel E Leaird, Andrew M Weiner

  • 1School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.

Nature
|June 7, 2013
PubMed
まとめ
この要約は機械生成です。

研究者らは,光学データを隠すための新しいタイムカローリング方法を開発しました. この技術は,通信データレートで時間軸の46%をカバーし,安全な通信を可能にします.

さらに関連する動画

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

関連する実験動画

Last Updated: May 10, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

科学分野:

  • 光学とフォトニック
  • メタマテリアルとは
  • 情報セキュリティ 情報セキュリティ

背景:

  • メタマテリアルは,陰性屈折指数のようなエキゾチックな性質を可能にし,目に見えないコートの研究につながった.
  • タイムカローリング (時間における出来事の隠蔽) は実証されているが,短い,孤立した出来事に限られている.
  • 以前の方法は,低カローリング効率 (10^-4%) と重複率 (41 kHz) を有しており,光通信には不適していました.

研究 の 目的:

  • 実践的な応用のための新しいタイムカローリング技術を実証する.
  • 通信データレートで高いカローキング効率を達成するために.
  • 安全な光学データ伝送を可能にするために.

主な方法:

  • テンポラル・タルボット効果を利用して自己イメージングを行う.
  • 通信データレートで動作するタイムカローリング技術の開発.
  • 擬似ランダムなデジタルデータストリームを隠す.

主要な成果:

  • 全時間軸の46%の隠蔽を達成しました.
  • 12.7ギガビット/秒のデータ隠蔽が実証されています.
  • 受信機から光学データを成功裏に隠した.

結論:

  • 実証されたタイムカローリング技術は,実用的なデータレートで動作します.
  • この方法は,安全な通信に直接的な影響を及ぼします.
  • タイムカローリングは現在,現実世界のアプリケーションのための実用的な技術です.