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関連する概念動画

Equivalent Capacitance01:19

Equivalent Capacitance

706
From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Equivalent Capacitance01:19

Equivalent Capacitance

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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Capacitors and Capacitance01:18

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
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Steady State Concentration01:05

Steady State Concentration

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A steady state refers to the level of a drug in the body once it has reached an equilibrium between administration and elimination. It represents the point at which the drug administration rate equals the drug elimination rate, resulting in a relatively constant concentration in the body over time. The dynamic equilibrium is crucial to ensure the drug's effectiveness with minimal risk of toxicity.
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Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
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Transient and Steady-state Response01:24

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In control systems, test signals are essential for evaluating performance under various conditions. The ramp function is effective for systems undergoing gradual changes, while the step function is suitable for assessing systems facing sudden disturbances. For systems subjected to shock inputs, the impulse function is the most appropriate test signal.
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空間的に解明された安定状態の負の電容量

Ajay K Yadav1, Kayla X Nguyen2, Zijian Hong3

  • 1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USA.

Nature
|January 16, 2019
PubMed
まとめ
この要約は機械生成です。

研究者は電鉄材料の負の電容性を直接測定し,ドメイン壁でそれを特定しました. この発見により 将来の電子機器の応用において この独特な状態の理解が進んでいます

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • 固体化学

背景:

  • 鉄電性材料の負の電容性は,ユニークな熱力学的状態にアクセスすることによって,高度な電子技術の可能性を秘めています.
  • 以前の研究はマクロスケールの現象に焦点を当て,負の容量の間接的な証拠を提供した.
  • この現象を利用した装置の理解と最適化には 直接的な局所的な測定が不可欠です

研究 の 目的:

  • 原子レベルでの鉄電気材料の安定状態負の電容性を直接測定し,空間的にマッピングする.
  • 負の電容性が安定したフェロ電気-ダイエレクトリックヘテロ構造内の特定の領域を特定する.
  • 地元の物理的特徴と負の容量の発生を相関させる.

主な方法:

  • 先進的な電子顕微鏡と計算シミュレーション (相場と第一原理に基づく) の組み合わせを使用した.
  • 原子解像度を達成するために,SrTiO3/PbTiO3の超網を調査した.
  • 原子の移動のベクトルマッピングと 局所電場の再構築を行いました

主要な成果:

  • 安定状態の負の電容量の直接測定が成功しました.
  • 特定された負の電容性は,特にフェロ電気材料のドメイン壁内にある.
  • 負の容量領域は,抑制された偏化により,より高いエネルギー密度とより大きな偏化性を示すことが判明した.

結論:

  • フェロ電気-ダイエレクトリックヘテロ構造のドメイン壁に直接マッピングされた負の電容量.
  • 負の電容性の安定化について 原子スケールでの洞察を提供します.
  • 負の電容性を利用した 電子機器の精密な設計に 道を切り開きます