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関連する概念動画

P-N junction01:11

P-N junction

634
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
634
Electrical Energy01:10

Electrical Energy

1.3K
Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules.
1.3K
Power and Energy01:12

Power and Energy

1.0K
The power and energy delivered to an element are subjects of great significance in the field of electrical engineering. It is a well-known fact that a 100-watt light bulb emits more light than a 60-watt one. Therefore, power and energy calculations play a crucial role in the analysis of electrical circuits.
Power, defined as the time rate of expending or absorbing energy, is quantified in units called watts (W). The relation between power and energy is mathematically given as
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Power Factor Correction01:20

Power Factor Correction

246
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
246
Photoelectric Effect02:26

Photoelectric Effect

30.0K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
30.0K
Electrical Power01:07

Electrical Power

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Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
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Updated: Aug 29, 2025

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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非線形パイロエレクトリックモジュールで集めた大きなエネルギー

Pierre Lheritier1, Alvar Torelló2,3, Tomoyasu Usui4

  • 1Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg.

Nature
|September 13, 2022
PubMed
まとめ

研究者は鉛タンタラートを用いた火力発電の熱エネルギーハーベスターを開発した. この装置は熱を効率的に電気に変換し 自動運転システムに持続可能なエネルギー源を提供します

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関連する実験動画

Last Updated: Aug 29, 2025

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科学分野:

  • 材料科学
  • エネルギー収集
  • 固体物理学

背景:

  • 持続可能な発電は 世界的に重要な課題です
  • 熱電材料は温度変動を電気に変換しますが,ジョウルの範囲の収穫能力がありません.
  • 既存の材料と装置は,大規模な熱エネルギー収集には不十分です.

研究 の 目的:

  • ジュールの範囲で電力を生み出すことができるマクロスコープの火力発電機を開発する.
  • 自律的な装置を動かすための火力発電材料の可能性を実証する.
  • パイロ電動の多層電容器を使用して高エネルギー変換効率を達成する.

主な方法:

  • 42gの鉛タンタレットを多層コンデンサとして使用したマクロスコープの熱エネルギーハーベスターの製造.
  • 熱力学サイクル毎の装置の電気出力の特徴とエネルギー密度.
  • マイクロコントローラとセンサーを搭載した自律的なエネルギーシステムに ハーベスターの能力をテストします
  • エネルギー変換効率とカーノ効率の評価

主要な成果:

  • ハーベスターは熱力学サイクル毎に11.2Jの電力を生産します.
  • 個々の火電モジュールは,サイクル毎に4.43Jcm−3のエネルギー密度を達成する.
  • 2つの小さなモジュール (0.3g) で,自律的なエネルギーハーベスターを持続的に動かすことができます.
  • 10Kの温度範囲でカーノーの効率の40%に達する.

結論:

  • 顕微鏡でスケーラブルで効率的な火力発電機は 今や実現可能だ
  • これらの装置は熱から電力を生み出すための有望な道を提供します.
  • この高い性能は,フェロ電気的相転換,低漏れ電流,および高解散電圧に起因する.