A Microwave Metamaterial Inspired Sensor for Non-Invasive Blood Glucose Monitoring

Vrba, Jan; Vrba, David

doi:10.13164/re.2015.0877

Cited by 34 publications

(16 citation statements)

References 26 publications

(33 reference statements)

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“…The permittivity is widely used to characterize not only the type of plant oils, but also their quality . The TESTO 270 deep frying oil tester (Testo SE & Co. KGaA, Lenzkirch, Germany) offers a fast an easy method to determine the quality of frying oils.…”

Section: Theory and Literature Reviewmentioning

confidence: 99%

On the Effect of Minor Oil Components on β‐Sitosterol/γ‐oryzanol Oleogels

Scharfe

Ahmane

Seilert

et al. 2019

Euro J Lipid Sci & Tech

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The role of solvent composition (polar minor components, PC) on β‐sitosterol/γ‐oryzanol oleogel formation, appearance, and properties is studied. Solvent composition is altered via thermal treatment and the elimination of natural PC from untreated sunflower and canola oil. A maximum in oleogel hardness is found. DSC reveals that sol‐gel transition is increasingly suppressed with the level of PC. This is attributed to two distinct mechanisms: enlarged interactions of PC with the structuring elements and a reduction in diffusion due to a higher solvent viscosity. Gel‐sol‐transition consists of two concurrent processes: decomposition of tube bundles (peak fronting) and the dissolution of tubes (peak). The peak area decreases with increasing solvent permittivity while simultaneously the area of the fronting increases. Gel‐sol‐transition temperatures are practically invariable for all samples indicating that the maximum in gel hardness cannot be related to changes in the solubility of the sterols. AFM microscopy reveals that the arrangement of the elements of scaffolding changes considerably with the level of PC. This work demonstrates the strong impact of PC on the self‐assembly of β‐sitosterol/γ‐oryzanol and oleogel properties. A detailed characterization of the oils is thus inevitable to perform trustworthy research. Practical Applications: It is widely known that a high intake of saturated fatty acids increases the risk of suffering from cardiovascular diseases. Unfortunately, their ability to provide unique texture to food products can hardly be met. Oleogelation has the potential to deliver the solid structure necessary for various fat‐based food products by transferring an oil rich in essential fatty acids into a solid‐like structure. Moreover, the nutritional value of these oils remains nearly unchanged. It is found that oil composition, precisely the fatty acid composition of the TAGs and minor oil components have a profound impact on oleogel properties. Fundamental understanding of network properties and formation of oleogels helps to maximize their capability for industrial application. The work presented reveals that detailed documentation of the quality of the oils, in particular the fatty acid composition and presence of polar minor components, is a necessary prerequisite to conduct reliable scientific work in the field oleogel research. Hardness and spatial arrangement of network building blocks of of β‐sitosterol/γ‐oryzanol oleogels is modified in the presence/absence of polar minor components.

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Section: Theory and Literature Reviewmentioning

confidence: 99%

On the Effect of Minor Oil Components on β‐Sitosterol/γ‐oryzanol Oleogels

Scharfe

Ahmane

Seilert

et al. 2019

Euro J Lipid Sci & Tech

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“…The results were simulated using CST Microwave Studio software and further verified experimentally. The response was extremely fast (comparable to data acquisition time) and the same was true for recovery time [12].…”

Section: Micro Strip Based Metamaterials Csrrmentioning

confidence: 74%

Design of Measuring System with Metamaterial Inspired CSRR

Sarwadnya¹,

Dawande²

2016

International Journal of Advanced Research in Computer and Comm

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This paper presents a design of measuring system with Metamaterial inspired CSRR (Complimentary SplitRing Resonator). The device is of portable, cost effective and which gives the accuracy. The theoretical approach of Metamaterial with its different applications is also discussed here. This paper is of high significance as current testing equipment of micro Complimentary Split-Ring Resonators (CSRR) are highly expensive, and therefore rare, but are also extremely bulky. Therefore developing portable, cost-effective, and robust testing equipment operating within the internationally reserved ISM radio frequency band is a main research work.

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“…For the used antenna elements, only limited size reductions can be achieved. Metamaterial-based structures such as described in [19][20][21] could be suitable for systems with a higher number of the antenna elements.…”

Section: Discussionmentioning

confidence: 99%

Microwave Tomography System for Methodical Testing of Human Brain Stroke Detection Approaches

Merunka

Massa

Vrba

et al. 2019

International Journal of Antennas and Propagation

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In this work, a prototype of a laboratory microwave imaging system suitable to methodically test the ability to image, detect, and classify human brain strokes using microwave technology is presented. It consists of an antenna array holder equipped with ten newly developed slot bowtie antennas, a 2.5 D reconfigurable and replaceable human head phantom, stroke phantoms, and related measuring technology and software. This prototype was designed to allow measurement of a complete S-matrix of the antenna array. The reconfigurable and replaceable phantom has currently 23 different predefined positions for stroke phantom placement. This setting allows repeated measurements for the stroke phantoms of different types, sizes/shapes, and at different positions. It is therefore suitable for large-scale measurements with high variability of measured data for stroke detection and classification based on machine learning methods. In order to verify the functionality of the measuring system, S-parameters were measured for a hemorrhagic phantom sequentially placed on 23 different positions and distributions of dielectric parameters were reconstructed using the Gauss-Newton iterative reconstruction algorithm. The results correlate well with the actual position of the stroke phantom and its type.

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A Microwave Metamaterial Inspired Sensor for Non-Invasive Blood Glucose Monitoring

Cited by 34 publications

References 26 publications

On the Effect of Minor Oil Components on β‐Sitosterol/γ‐oryzanol Oleogels

On the Effect of Minor Oil Components on β‐Sitosterol/γ‐oryzanol Oleogels

Design of Measuring System with Metamaterial Inspired CSRR

Microwave Tomography System for Methodical Testing of Human Brain Stroke Detection Approaches

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