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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Parallel Resonance01:23

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Series Resonance01:17

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The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
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Related Experiment Video

Updated: Aug 5, 2025

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Shielding Performance of Electromagnetic Shielding Fabric Implanted with "Split-Ring Resonator".

Zhe Liu1,2, Jin Duan1,2, Xiuchen Wang2,3

  • 1School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, China.

Polymers
|March 29, 2023
PubMed
Summary
This summary is machine-generated.

This study embeds split-ring resonator (SRR) metamaterials into electromagnetic shielding (EMS) fabrics using invisible embroidery. This method enhances shielding effectiveness (SE) by 6-15 dB while preserving fabric porosity.

Keywords:
electromagnetic shielding fabricimplantationimprovementshielding effectivenesssplit-ring resonator

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Textile Engineering

Background:

  • Electromagnetic shielding (EMS) fabrics are crucial for protection, with ongoing research focused on improving their shielding effectiveness (SE).
  • Existing EMS fabrics often face trade-offs between shielding performance and desirable fabric properties like porosity and lightweight characteristics.

Purpose of the Study:

  • To propose and evaluate a novel method for enhancing the SE of EMS fabrics by incorporating metamaterial structures.
  • To investigate the effectiveness and influencing factors of implanting split-ring resonator (SRR) metamaterials into EMS fabrics.

Main Methods:

  • Invisible embroidery technology was utilized to implant hexagonal SRR structures made of stainless-steel filaments directly into EMS fabrics.
  • Shielding effectiveness (SE) of the modified fabrics was experimentally tested and analyzed to determine the impact of SRR implantation and its parameters.

Main Results:

  • SRR implantation significantly improved the SE of stainless-steel EMS fabrics, with increases ranging from 6 dB to 15 dB across various frequency bands.
  • The SE generally decreased with a reduction in the outer diameter of the SRR, with varying rates across different frequency ranges.
  • Increasing the diameter of the embroidery threads also led to a marginal increase in SE, though not significantly.

Conclusions:

  • Implanting SRR metamaterials is an effective strategy to enhance the SE of EMS fabrics without compromising their porous and lightweight nature.
  • The study highlights the influence of SRR dimensions and embroidery thread parameters on SE, suggesting further exploration of other factors and potential failure modes.
  • This novel approach offers a simple, convenient, and pore-preserving method for designing and producing advanced EMS fabrics.