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相关概念视频

Aliasing01:18

Aliasing

572
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
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Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Even and Odd Signals01:17

Even and Odd Signals

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An even signal, whether in continuous-time or discrete-time, is defined by its symmetry with its time-reversed version. Mathematically, this is represented as
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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Back EMF01:24

Back EMF

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Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a current through a loop of wire located in a magnetic field. As a result, the magnetic field exerts a torque on the loop. This rotates a shaft, extracting mechanical work from the electrical current sent in initially. When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday's law) is...
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相关实验视频

Updated: Jan 18, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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基于1位数字编码的横眼干扰方法.

Zehao Wang1, Xiaolong Su1, Panhe Hu1

  • 1College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China.

iScience
|September 10, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种使用单脉冲雷达的数字编码元表面 (DCM) 的新型交叉眼干扰 (CEJ) 方法. 基于DCM的方法简化了硬件,并大大提高了干扰效率,实现了超过两倍的增益.

关键词:
应用科学 应用科学工程 工程师 工程师 工程师光子学 是一个光子学.

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科学领域:

  • 电子战是一种电子战.
  • 甲基材料和甲基表面.
  • 雷达系统工程 雷达系统工程

背景情况:

  • 单脉冲雷达对于导弹指导至关重要,但易受横眼干扰 (CEJ) 的影响.
  • 传统的CEJ需要复杂的硬件来进行振幅和相位调制.
  • 数字编码元面 (DCM) 提供先进的电磁波调制能力.

研究的目的:

  • 提出和验证一种使用数字编码元面 (DCM) 的新型十字眼干扰 (CEJ) 方法.
  • 为了证明使用DCM生成CEJ信号的可行性,用于增强的单脉冲雷达对策.

主要方法:

  • 对DCM的电磁调制模型的推导.
  • 使用两个DCM进行CEJ信号生成的理论演示.
  • 模拟分析以评估拟议的基于DCM的CEJ方法的性能.

主要成果:

  • 拟议的方法成功地使用DCM产生横眼干扰信号.
  • 与传统方法相比,实现了双倍以上的横眼增益.
  • 该方法在40°以内的DCM相位调节误差下仍然有效.

结论:

  • 数字编码元面为实施先进的横眼干扰提供了一个简化和有效的平台.
  • 基于DCM的CEJ方法为单脉冲雷达系统的干扰增益提供了显著的改进.
  • 这项技术在电子战能力方面是一个有前途的进步.