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相关概念视频

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

995
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
995
Second Order systems II01:18

Second Order systems II

79
In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
79
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

321
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
321
Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

59
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
59
Downsampling01:20

Downsampling

121
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
121
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

989
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
989

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相关实验视频

Updated: May 24, 2025

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

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用基于协议的欺骗攻击和测量量量化对非线性马尔科夫系统进行分散估计.

Yuyan Wu, Huaicheng Yan, Meng Wang

    IEEE transactions on cybernetics
    |March 4, 2025
    PubMed
    概括

    这项研究设计了一个间隔类型-2模糊马尔科夫跳跃系统的异步估计器,该系统面临动态定量化和欺骗攻击. 该研究引入了新的攻击策略,并使用利亚普诺夫稳定理论确保了系统性能.

    科学领域:

    • 控制系统工程 控制系统工程
    • 模糊逻辑系统 模糊逻辑系统
    • 随机系统 随机系统 随机系统

    背景情况:

    • 间隔类型-2 (IT2) 模糊系统对于模拟不确定性至关重要.
    • 马尔科夫跳跃系统 (MJS) 描述了突然变化的系统.
    • 量化和欺骗攻击对系统估计构成重大挑战.

    研究的目的:

    • 在动态量化和欺骗攻击下设计IT2模糊MJS的异步估计器.
    • 开发一种基于协议的新型欺骗攻击策略.
    • 为了确保严格消耗性表现的估计错误.

    主要方法:

    • 使用隐藏的马尔科夫模型 (HMM) 进行系统模式观测.
    • 应用利亚普诺夫稳定理论和线性矩阵不等式 (LMI) 方法.
    • 为不同的传感器设计独立的攻击策略,以节省对手的能量.

    主要成果:

    • 导出足够的条件以保证严格分散的估计错误的性能.
    • 提出了一种新的欺骗攻击策略,利用量化输出信息.
    • 设计的估计器的有效性和拟议的攻击战术的优势通过示例得到证实.

    更多相关视频

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    Published on: September 8, 2023

    472
    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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    结论:

    • 拟议的异步估计器在动态量化和欺骗攻击下有效处理IT2模糊的MJS.
    • 这种新型的攻击策略表明了利用系统漏洞的复杂方法.
    • 该研究为分析和保护复杂的动态系统提供了一个强大的框架.