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関連する概念動画

Lossless Lines01:23

Lossless Lines

In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
Orthogonal Trajectories01:26

Orthogonal Trajectories

Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
Reflective Property of Parabolas01:26

Reflective Property of Parabolas

A parabola is a basic type of conic section that results from the intersection of a plane with a double-napped cone in a direction parallel to one of the cone's sides. This U-shaped curve has a distinctive reflective property: all incoming rays parallel to its axis of symmetry are directed toward a single point, known as the focus. This property is widely utilized in optical and communication technologies that require precise signal concentration.In analytic geometry, a parabola is defined as...

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関連する実験動画

Updated: Jul 15, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

ネガティブ・リフレクションへのキラル経路

J B Pendry1

  • 1Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, UK.

Science (New York, N.Y.)
|November 20, 2004
PubMed
まとめ

単一のキラル共鳴を導入することで,負折射材料を簡素化します. この方法では,1つの二極化に対して負折射を実現し,設計を改善し,新しい研究分野を可能にします.

科学分野:

  • 物理 物理学 物理学とは
  • マテリアルサイエンス 材料科学
  • 電磁気学は,電磁気学である.

背景:

  • ネガティブ・リフレクションは,通常,同時にネガティブな磁気透過性と電気的許容性を要求します.
  • そのため,材料内の2つの異なる共鳴が必要になり,デバイスの設計を複雑にします.

研究 の 目的:

  • ネガティブな屈折を達成するための単一のキラル共鳴の可能性を調査する.
  • 負折射材料の簡素化された設計を探求する.

主な方法:

  • この研究では,単一のキラル共鳴を材料に導入します.
  • 異なる偏極化に対する結果の折射性能を分析した.

主要な成果:

  • 単一のキラル共鳴が,特定の偏振の1つの負の折射を誘導することが判明しました.
  • このアプローチは,従来の方法と比較して設計要件を簡素化します.

結論:

  • シングルキラル共鳴は,負屈折へのより効率的で簡素化された経路を提供します.
  • この発見は,メタマテリアルと光学における新しい研究方向性を開きます.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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The Diffusion of Passive Tracers in Laminar Shear Flow
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The Diffusion of Passive Tracers in Laminar Shear Flow

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関連する実験動画

Last Updated: Jul 15, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018