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相关概念视频

Active Filters01:25

Active Filters

856
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
856
Passive Filters01:27

Passive Filters

562
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
562
Op Amp AC Circuits01:18

Op Amp AC Circuits

238
Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
238
Clipper Circuit01:18

Clipper Circuit

482
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
482
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

4.6K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
4.6K
Superposition Theorem for AC Circuits01:13

Superposition Theorem for AC Circuits

693
Consider encountering a circuit in a steady state where all its inputs are sinusoidal, yet they do not all possess the same frequency. Such a circuit is not classified as an alternating current (AC) circuit, and consequently, its currents and voltages will not exhibit sinusoidal behavior. However, this circuit can be analyzed using the principle of superposition.
The principle of superposition stipulates that the output of a linear circuit with several concurrent inputs is equivalent to the...
693

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相关实验视频

Updated: Jul 17, 2025

X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
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X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells

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一个超低温交流电过器.

Chenguang Zhang1, Xin Jiao1, Yingyu Wang2

  • 1School of Materials Science and Engineering, Tianjin Key Laboratory for Photoelectric Materials & Devices, Key Laboratory of Display Materials and Photoelectric Devices, Tianjin University of Technology, Tianjin, 300384, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|September 2, 2023
PubMed
概括

这项研究引入了一种使用超级电容器的新型超低温交流电 (AC) 过器. 这种先进的过器可靠地在极寒条件下运行,克服了传统电解电容器的局限性.

关键词:
交替电流过的过器.碳纳米离子碳纳米离子石墨烯是一种石墨烯.低温低温的低温是因为超级电容器的超级电容器是什么

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电气工程 电气工程
  • 电化学 电化学 电化学

背景情况:

  • 使用电解电容器 (AEC) 的传统交流电 (AC) 过器在超低温 (≤-30°C) 时表现不佳.
  • 这种限制阻碍了电子设备在极寒环境中可靠运行.

研究的目的:

  • 开发一种新型的超低温交流过器,在极寒条件下提高性能.
  • 为了研究超级电容器的潜力,基于一个独特的混合结构,用于交流过应用.

主要方法:

  • 制造一个高频超级电容器,采用一种共聚结合的空心碳洋-石墨烯混合结构.
  • 超级电容器与低点电解质的整合.
  • 在包括超低温在内的广泛温度范围内对过器性能进行表征.

主要成果:

  • 超级电容器表现出优异的过能力和稳定的直流 (DC) 输出,低波动系数在-50°C至0°C之间.
  • 混合结构表现出高电子导电性,高效的离子吸附/脱离和快速的离子扩散动力学.
  • 开发的交流过器显示出高负相角,低消散因子,短电阻-电容时间常数 (τRC = 0.098 ms 在120 Hz) 和高容量保留在-30°C以下,优于AECs.

结论:

  • 开发的基于新型超级电容器的超低温交流过器有效地克服了传统AEC的局限性.
  • 这一进步是实现在极寒条件下可靠操作电子设备的重要一步.
  • 具有共价键的空心碳洋-石墨烯混合结构对于实现卓越的低温性能至关重要.