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関連する概念動画

Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

134
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
134
RLC Series Circuits: Impedance01:29

RLC Series Circuits: Impedance

2.2K
When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining the performance of AC circuits. It is represented by Z, which is a combination of resistance and reactance, and depends upon the angular frequency, measured in ohms.
Thus, the magnitude of the impedance is given by the following equation,
2.2K
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
418
Bode Plots Construction01:24

Bode Plots Construction

785
The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
785
Impedances and Admittance01:23

Impedances and Admittance

797
In the realm of AC circuits, passive circuit elements like resistors, inductors, and capacitors take on a different character when characterized by phasor voltage and current. Their behavior is expressed through impedance, a vital concept in AC circuit analysis.
Impedance is a measure of resistance to sinusoidal current flow in an AC circuit. Unlike their behavior in DC circuits, where inductors appear as short circuits and capacitors as open circuits, the behavior of these components in AC...
797
Impedance Combination01:21

Impedance Combination

504
Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the...
504

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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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インペデンスによる局所化

Alhassan Algazlan, Marzouqi Salamah, Dalal Alrushaydan

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    PubMed
    まとめ
    この要約は機械生成です。

    トランスインペダンスマトリックス (TIM) 測定は,頭インプラントの電極配置のリアルタイムの手術内評価に希望を示しています. この技術は異常を正確に検出し,手術後のイメージングの必要性を軽減し,手術の精度を向上させる可能性があります.

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    科学分野:

    • 耳鼻喉科
    • 神経外科
    • 生物医学工学

    背景:

    • コクリア内電極の正確な配置は,コクリアインプラント (CI) の成功に不可欠です.
    • 放射線画像は手術後の評価の標準ですが リアルタイムで手術中のフィードバックが欠けています
    • トランスインペダンスマトリックス (TIM) 測定は,リアルタイムでの手術内評価のための新しいアプローチを提供します.

    研究 の 目的:

    • コchlear implantation 中の電極配列の位置を手術中に評価するために,トランスインペダンスマトリックス (TIM) の測定の正確性と信頼性を評価する.
    • 電極配置の異常を検出するためのX線画像とTIMデータを比較する.
    • トップ・フォールド・オーバー (TFO) などの特定の構成を特定する際にTIMの有用性を調査する.

    主な方法:

    • CI532®とCI632®の電極配列でCIを施した15人の患者 (24人の耳) に関する遡及的観察研究.
    • 手術中のTIMデータを収集し,手術中のX線写真と手術後のX線写真と比較した.
    • TIMヒートマップは,電圧グラデーションの分布とTFO検出のために分析されました.

    主要な成果:

    • コクリアのインプラントの96%は正規のTIM電圧分布を示し,適切なモディオラー配置を示した.
    • 片端の折りたたみ (TFO) の1例は,TIMを使用して手術中に正確に特定され,X線写真で確認されました.
    • TIMの結果は,他のすべての症例における放射線学的評価と一致し,高い信頼性を示した.

    結論:

    • トランスインペダンスマトリックス (TIM) 測定は,Slim Modiolar電極配列による内インプラントの信頼性の高いツールです.
    • TIMは電子位置の偏差を正確に検出し,手術の精度を高め,潜在的に放射線曝露と術後のイメージングを減らすことができます.
    • 臨床実施のためのTIMを検証し,標準化されたプロトコルを確立するために,さらなる見通し研究が必要である.