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関連する概念動画

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

3.9K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
3.9K
Van de Graaff Generator01:15

Van de Graaff Generator

1.8K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
1.8K
Transformers01:26

Transformers

1.2K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.2K
Bridge rectifier01:24

Bridge rectifier

816
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...
816
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

468
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
468
Types Of Transformers01:16

Types Of Transformers

1.0K
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
1.0K

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関連する実験動画

Updated: Sep 10, 2025

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

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RF トランスフォーマーでベッセルビームを生成する

Jian-Yu Lu

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control
    |August 21, 2025
    PubMed
    まとめ

    研究者は,単一の無線周波数 (RF) パワーアンプを使用してブロードバンドベッセルビームを作成する新しい方法を開発し,高度な超音波画像アプリケーションのサイズと電力を削減しました.

    科学分野:

    • 音学 と 波 現象
    • 医療用画像技術
    • 材料科学

    背景:

    • ベッセルビームは, difraktion-free 伝播と広い深さのフィールドを提供し,様々なアプリケーションに理想的です.
    • 伝統的な超音波ベッセルビーム生成には,大量の電力集約型マルチアンプシステムが必要であり,ウェアラブルアプリケーションを制限しています.

    研究 の 目的:

    • 超音波アプリケーションのためのブロードバンドベッセルビームを生成するためのコンパクトで効率的な方法を開発する.
    • 医療用ウェアラブル画像と超高解像度画像に ベッセルビームの応用を可能にします

    主な方法:

    • 単一の高圧無線周波数 (RF) パワーアンプとカスタム RF トランスフォーマーを使用した.
    • PZTセラミック/ポリマー複合体製のカスタム製の10リング,2.5MHzのブロードバンド環状配列トランスデューサを使用した.
    • 約 +/- 90 V の水中のパルスベッセルビーム.

    主要な成果:

    • 複数の増幅器,シミュレーション,理論と比べられるパルスベッセルビームを達成した.
    • 約2.53mm (4.22波長) の -6dBのビーム幅を証明した.
    • 約216mm (360波長) の有意な波深が得られた.

    さらに関連する動画

    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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    関連する実験動画

    Last Updated: Sep 10, 2025

    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

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    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
    10:42

    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

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    結論:

    • この新しい方法は,ベッセルビーム生成システムのサイズ,重量,電力消費量を大幅に削減します.
    • この進歩は,ベッセルビームをウェアラブル超音波装置に統合することを容易にする.
    • スキャンされたリフレクターでベッセルビームを使用した3Dとマルチプレーンのイメージングの潜在能力を実証した.