scholarly journals Hypersensitized Metamaterials Based on a Corona-Shaped Resonator for Efficient Detection of Glucose

2020 ◽  
Vol 11 (1) ◽  
pp. 103
Author(s):  
Yadgar I. Abdulkarim ◽  
Fahmi F. Muhammadsharif ◽  
Mehmet Bakır ◽  
Halgurd N. Awl ◽  
Muharrem Karaaslan ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Glucose Concentration ◽  
Electromagnetic Waves ◽  
Surface Current ◽  
Superior Performance ◽  
Promising Candidate ◽  
Efficient Detection ◽  
Circular Structure ◽  
Clear Shift ◽  
Current Electric Field

In this work, a new design for a real-time noninvasive metamaterial sensor, based on a corona-shaped resonator, is proposed. The sensor was designed numerically and fabricated experimentally in order to be utilized for efficient detection of glucose in aqueous solutions such as water and blood. The sensor was inspired by a corona in-plane-shaped design with the presumption that its circular structure might produce a broader interaction of the electromagnetic waves with the glucose samples. A clear shift in the resonance frequency was observed for various glucose samples, which implies that the proposed sensor has a good sensitivity and can be easily utilized to distinguish any glucose concentration, even though their dielectric coefficients are close. Results showed a superior performance in terms of resonance frequency shift (1.51 GHz) and quality factor (246) compared to those reported in the literature. The transmission variation level ∆|S21| was investigated for glucose concentration in both water and blood. The sensing mechanism was elaborated through the surface current, electric field and magnetic field distributions on the corona resonator. The proposed metamaterials sensor is considered to be a promising candidate for biosensor and medicine applications in human glycaemia monitoring.

scholarly journals Efficient and Compact Near-Field Coupled Hybrid Antenna Using a Single Radiating Subwavelength Split-Ring Resonator

Electronics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 527
Author(s):  
Zinching Dang ◽  
Marco Rahm
Keyword(s):  
Resonance Frequency ◽  
Electromagnetic Waves ◽  
Ring Resonator ◽  
Near Field ◽  
Low Frequency ◽  
Split Ring Resonator ◽  
Dipole Antenna ◽  
Angular Width ◽  
Split Ring ◽  
Broadband Internet

Modern applications in the realms of wireless communication and mobile broadband Internet increase the demand for compact antennas with well defined directivity. Here, we present an approach for the design and implementation of hybrid antennas consisting of a classic feeding antenna that is near-field-coupled to a subwavelength resonator. In such a combined structure, the composite antenna always radiates at the resonance frequency of the subwavelength oscillator as well as at the resonance frequency of the feeding antenna. While the classic antenna serves as impedance-matched feeding element, the subwavelength resonator induces an additional resonance to the composite antenna. In general, these near-field coupled structures are known for decades and are lately published as near-field resonant parasitic antennas. We describe an antenna design consisting of a high-frequency electric dipole antenna at f d = 25 GHz that couples to a low-frequency subwavelength split-ring resonator, which emits electromagnetic waves at f SRR = 10.41 GHz. The radiating part of the antenna has a size of approximately 3.2 mm × 8 mm × 1 mm and thus is electrically small at this frequency with a product k · a = 0.5 . The input return loss of the antenna was moderate at − 18 dB and it radiated at a spectral bandwidth of 120 MHz. The measured main lobe of the antenna was observed at 60 ∘ with a − 3 dB angular width of 65 ∘ in the E-plane and at 130 ∘ with a − 3 dB angular width of 145 ∘ in the H-plane.

A MnV2O6/graphene nanocomposite as an efficient electrocatalyst for the oxygen evolution reaction

Nanoscale ◽  
2020 ◽  
Vol 12 (30) ◽  
pp. 16028-16033 ◽  
Author(s):  
Kyeong-Ho Kim ◽  
Yun-Hyuk Choi ◽  
Seong-Hyeon Hong
Keyword(s):  
Cost Effectiveness ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Superior Performance ◽  
Promising Candidate ◽  
Graphene Nanocomposite

A MnV2O6/graphene nanocomposite is a promising candidate as an OER electrocatalyst for water splitting with superior performance and cost-effectiveness.

Control of Ehrlich Tumor Growth by Electromagnetic Waves at Resonance Frequency (In Vivo Studies)

2005 ◽  
Vol 24 (1) ◽  
pp. 9-21 ◽  
Author(s):  
M. A. Fadel ◽  
Reem H. El-Gebaly ◽  
Amany A. Aly ◽  
Fakhry F. Ibrahim
Keyword(s):  
Tumor Growth ◽  
Resonance Frequency ◽  
Electromagnetic Waves ◽  
In Vivo Studies ◽  
Ehrlich Tumor ◽  
At Resonance

Electrically tunable graphene-based metamaterials: A brief review

2019 ◽  
Vol 33 (33) ◽  
pp. 1950404 ◽  
Author(s):  
Tran Van Huynh ◽  
Bui Son Tung ◽  
Bui Xuan Khuyen ◽  
Nguyen Thanh Tung ◽  
Vu Dinh Lam
Keyword(s):  
Physical Properties ◽  
Electromagnetic Waves ◽  
Recent Progress ◽  
Electromagnetically Induced Transparency ◽  
Promising Candidate ◽  
Perfect Absorption ◽  
Fundamental Interest ◽  
Nonlinear Materials ◽  
Artificial Materials ◽  
Induced Transparency

Metamaterials (MMs) represent a group of exciting artificial materials that interact with electromagnetic waves in unnatural ways. The motivation behind MM research arises not only from fundamental interest in their unique physical properties but also from the desire of creating smarter materials for advanced technological applications. Despite an abundance of studies on numerous shapes, sizes and operating frequencies, the use of conventional metal-dielectric components makes the post-fabrication physical properties of MMs unalterable. Therefore, the integration of other nonlinear materials is necessary for exploring the functional limits of MMs. In this regard, a mono-layer of carbon, the so-called graphene, with its unique electrical conductivity is identified as a promising candidate. This review discusses the recent progress on tunable graphene-based THz MMs for perfect absorption and electromagnetically-induced transparency effects. A short overview of prospect challenges and tendencies is also given for future development of graphene-integrated MMs towards upcoming smart meta-devices.

Development of Immunoassay for Detection of Meat and Bone Meal in Animal Feed

2005 ◽  
Vol 68 (9) ◽  
pp. 1860-1865 ◽  
Author(s):  
SHIN-HEE KIM ◽  
TUNG-SHI HUANG ◽  
THOMAS A. SEYMOUR ◽  
CHENG-I WEI ◽  
STEPHEN C. KEMPF ◽  
...  
Keyword(s):  
Smooth Muscle ◽  
Monoclonal Antibodies ◽  
Animal Feed ◽  
Superior Performance ◽  
Hybridoma Cells ◽  
Enzyme Linked Immunosorbent Assay ◽  
Meat And Bone Meal ◽  
Bone Meal ◽  
Efficient Detection ◽  
Heat Treated

An immunoassay system was developed for efficient detection of prohibited meat and bone meal (MBM) in animal feed. Monoclonal antibodies (MAbs) were raised against bovine smooth muscle autoclaved at 130°C for 20 min. Among the 1,500 supernatants of hybridoma cells screened, MAbs 3E1, 1G3, and 3E10 were selected and characterized in this study. The first set of MAbs produced, 3E1 and 1G3, had stronger reactivity against MBM than against smooth muscle that was heat treated at 90°C for 10 min. However, reactivity gradually increased against smooth muscle that was autoclaved at 130°C for up to 1 h. The enzyme-linked immunosorbent assay for detection of MBM in animal feed was optimized with the MAb 3E10 because of its superior performance. MAb 3E10 diluted to 100-fold was used to differentiate bovine MBM from that of other species in ingredients used for commercial animal feeds and could detect down to 0.05% MBM mixed in animal feed.

scholarly journals Development of Single layered, Wide angle, Polarization insensitive Metamaterial Absorber

2021 ◽  
Vol 71 (03) ◽  
pp. 372-377
Author(s):  
Atipriya Sharma ◽  
Ravi Panwar ◽  
Rajesh Khanna
Keyword(s):  
Surface Current ◽  
Metamaterial Absorber ◽  
Absorption Mechanism ◽  
Design Variables ◽  
Proposed Model ◽  
Parametric Studies ◽  
Polarization Insensitive ◽  
Absorption Phenomenon ◽  
Current Electric Field ◽  
Measured Response

The simultaneous achievement of multiband absorption, polarisation-insensitive, and angularly stable absorber is a difficult job. Therefore, in this article, an efficient single-layered absorber is designed, critically analysed, fabricated, and experimentally validated. The proposed model incorporates eight sectors loaded a circle inside the square. The four discrete absorption peaks are observed at 4.4 GHz, 6.0 GHz, 14.1 GHz, and 16.0 GHz manifesting absorption intensities of 94%, 84%, 82%, and 92%, respectively. Parametric studies have been also exercised to investigate the influence of discrete geometrical design variables on the proposed absorber. The proposed structure is symmetrical in geometry, consequence in polarisation-independent behaviour. The absorption mechanism is also explained by analysing the surface current, electric field, and magnetic field distributions. Besides, the complex electromagnetic parameters are extracted to realise the absorption phenomenon. Additionally, to validate the simulated results, an optimal sample is fabricated and the measured response is well-matched with simulated ones.

scholarly journals CPW-Fed Penta Band Monopole Antenna for Multiservice Wireless Applications

2021 ◽  
Vol 7 (1) ◽  
pp. 66-76
Author(s):  
Raj Kumar ◽  
Yedukondalu Kamatham ◽  
Samineni Peddakrishna ◽  
Ajitha Gaddam
Keyword(s):  
Reflection Coefficient ◽  
Resonance Frequency ◽  
Current Distribution ◽  
Surface Current ◽  
Experimental Result ◽  
Impedance Bandwidth ◽  
Distribution Analysis ◽  
Frequency Bands ◽  
Rectangular Patch ◽  
Additional Resonance

A compact triple T-shaped stub with meander loaded strip antenna for penta band applications is proposed. The rectangular patch antenna with meandered and open-ended slot cuts is utilized to realize four operating bands at 2.45 GHz, 3.1 GHz, 5.3 GHz, and 6.5 GHz with an impedance bandwidth of 400 MHz (2.15-2.550 GHz), 1000 MHz (2.7-3.7 GHz), 200 MHz (5.4-5.6 GHz), and 200 MHz (6.4-6.6 GHz), respectively. For an additional resonance frequency, the length of the central T-shaped stub is slightly modified which causes the variation in the current distribution. As a result, the resonance frequency of 5.5 GHz is divided into two resonance frequency bands which are operating at 5.25 GHz and 5.85 GHz with an impedance bandwidth of 100 MHz (5.25-5.35 GHz) and 200 MHz (5.75-5.95 GHz), respectively. Furthermore, a parametric reflection coefficient and surface current distribution analysis is carried out to understand the strip and slot behavior at resonance frequency bands. Finally, a prototype is fabricated and its reflection coefficient, gain, and radiation pattern are measured. The experimental result shows that the proposed antenna is reliable for penta band applications.

scholarly journals Eigenwave spectra of a solid-state plasma cylinder in a strong longitudinal magnetic field

2021 ◽  
Vol 26 (2) ◽  
pp. 37-45
Author(s):  
Y. Averkov ◽  
◽  
Y. Prokopenko ◽  
V. Yakovenko ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Solid State ◽  
Electromagnetic Waves ◽  
Surface Current ◽  
Electron Mass ◽  
Plasma Cylinder ◽  
Field Methods ◽  
Phase Velocities ◽  
State Plasma

Subject and Purpose. Eigenwave studies of various bounded structures make a prolific line of investigation in both modern radiophysics and solid-state and functional electronics. Conducting solids demonstrating plasma (semiconductor) properties attract particular attention. Owing to the high conductivity of semiconductors (as it is inversely proportional to the charge carrier effective mass that is smaller than the free electron mass), interest exists in propagation features of slow elliptical-polarization electromagnetic waves – helicons – in magnetized semiconductor waveguides. The present work aims to determine eigenwave spectra of a solid-state plasma cylinder in a strong constant concentric magnetic field. Methods and Methodology. The eigenwave theoretical study of a magnetoplasma cylinder in the free space is conducted in terms of Maxwell's equations. The motion equation of conduction electrons of a solid-state plasma is adopted with quasi-stationarity electromagnetic field conditions satisfied. The collision frequency of majority charge carriers is assumed substantially less than their cyclotron frequency. Results. The dispersion equation of a cylindrical solid-state plasma (semiconductor) waveguide has been obtained. It has been shown that a collisionless magnetoplasma waveguide supports propagation of bulk and surface helicons. The propagation is accompanied by the surface current flowing lengthways cylinder components. Charged particle collisions destroy the surface current and initiate additional (to helicons) H-type hybrid waves such that their phase velocities coincide with phase velocities of the helicons. It has been found that the nonreciprocity effect holds for the waveguide eigenwaves having identical field distribution structures but different azimuthal propagation directions, and it also does as soon as the external magnetic field changes its sense. Conclusion. The research results have deepened our understanding of physical properties of bounded structures with plasma-like filling media. More systematization has been added to the knowledge of eigenwave behavior of these structures in a quasi-stationarity electromagnetic field.

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