Interaction between electromagnetic waves and biological materials

Tofighi, Mohammad

doi:10.1016/b978-0-12-802903-9.00002-3

Cited by 5 publications

(5 citation statements)

References 125 publications

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“…Perpendicular to the direction of the applied field, the total charge passing through a unit area within the dielectric material is known as the polarization. e following are the types of polarization [91].…”

Section: Polarizationmentioning

confidence: 99%

Cells Electrical Characterization: Dielectric Properties, Mixture, and Modeling Theories

Nasir

Ahmad

2020

Journal of Engineering

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Electrical detection of biotic materials and their properties is always crucial in Biomedical Engineering. It emphasizes elaborate analysis of a certain disease diagnosis using electrical means which includes the study of electrical properties followed by detection, identification, and quantification of biotic entities. Proper and early detection of cells, which can be normal or cancerous, holds never-ending demand. This review emphasizes the electrical characterization methods in modeling and classification of cell properties. Moreover, standard methods have been highlighted and discussed to yield performance analysis. This study suggests that techniques presented for single-cell analysis (SCA) are always precise and hold great scope compared to those for cell mixture. SCA plays a promising role in disease diagnosis and treatment planning, as it not only detects the cells but also helps in identification. Distinct electrical-based cell detection techniques are highlighted, along with the pros and cons of various SCA devices. The content, in terms of methodologies and available techniques, of this review paper is useful to attract researchers working in this area.

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Section: Polarizationmentioning

confidence: 99%

Cells Electrical Characterization: Dielectric Properties, Mixture, and Modeling Theories

Nasir

Ahmad

2020

Journal of Engineering

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“…For 3D graphene (aerogel, hydrogel) polymer composites, two impedance components (composites and air substrate) must be considered in a circuit. Using eqn (7,10,14) and (15), the input impedance for a monolayer polymer composite shielding material can be represented as:…”

Section: Reviewmentioning

confidence: 99%

“…EM radiation emitted in the range of frequencies that meddles with the input signals of electronic devices creates interference known as electromagnetic interference (EMI), which is detrimental to the operation of sensitive equipment. [1][2][3][4][5][6][7] EMI is a disturbance where the electromagnetic field generated by one component interferes with another, leading to degradation and malfunctioning of sensitive electronic devices. 8,9 This is why people are asked to switch off their mobile phones while boarding aircraft, fearing that it may cause failure of sensitive components or disruption of the communication signal with the air traffic control.…”

Section: Introductionmentioning

confidence: 99%

Polymer composites with 3D graphene architectures as high-performance EMI shielding materials: a review

Chhetri,

Kuila

2024

RSC Appl. Polym.

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“…As previously indicated, experimental dielectric relaxation data for human blood show a deviation from the classical Debye model due to the fact that blood does not have a single relaxation time, but actually it presents a certain distribution of relaxation times [11] . This can be thought of as the superposition of parallel combinations of linear series RC circuits with different time constants [12] .…”

Section: Revisiting Relaxation Modelsmentioning

confidence: 99%

“…This way, to account for this distribution, the complex permittivity of a species modeled by a superposition of Debye functions with relaxation times following a statistical distribution with probability density function (pdf)

is [12] :

where

is the complex permittivity at frequency

2

is the dielectric constant at very high values of the frequency (the real part of the complex

is the dielectric constant under DC conditions (zero frequency), τ is the relaxation time of the dipoles (where each micro-particle represents an electric dipole),

is the DC ionic conductivity and

is the permittivity of free space. It is easy to prove that the real (

) and imaginary (

) parts of the complex permittivity are given as

, where:

where:

1

…”

Section: Revisiting Relaxation Modelsmentioning

confidence: 99%

Dielectric relaxation model of human blood as a superposition of Debye functions with relaxation times following a Modified-Weibull distribution

Sodhi¹,

Ozelim

Rathie

2021

Heliyon

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Dielectric spectroscopy of the human blood is a powerful and convenient non-invasive testing technique that can be used to diagnose diseases such as diabetes and leukemia. One needs to consider rigorous experimental procedures and mathematical models to make the results of this type of test comparable. The present paper will discuss previously published results to further investigate the statistical modeling of the dielectric properties of human blood. The analysis shows that previously published results were related to Modified Weibull (MW) distributions of relaxation times, not Gaussian distributions, as reported. This re-analysis prevents the ill definition of fitting parameters, making sure they present physically justifiable values. Besides, for fluids presenting a Modified Weibull distribution of relaxation times, novel exact and closed-form expressions for the real and imaginary parts of complex permittivities were obtained in terms of generalized hypergeometric functions. Also, a high accuracy approximation was built for the imaginary part of the complex permittivity, creating an easy-to-use alternative expression for practitioners. The new results are used to fit experimental results for human blood, showing that more robust estimators are built for the parameters involved, which can be used as thresholds to classify the dielectric behavior of blood as normal (healthy) or anomalous (sick).

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Interaction between electromagnetic waves and biological materials

Cited by 5 publications

References 125 publications

Cells Electrical Characterization: Dielectric Properties, Mixture, and Modeling Theories

Cells Electrical Characterization: Dielectric Properties, Mixture, and Modeling Theories

Polymer composites with 3D graphene architectures as high-performance EMI shielding materials: a review

Dielectric relaxation model of human blood as a superposition of Debye functions with relaxation times following a Modified-Weibull distribution

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