scholarly journals Vertical interface augmented tunability of scattering spectra in ferromagnetic microwire/silicone rubber metacomposites

2021 ◽  
Vol 8 ◽  
pp. 10
Author(s):  
Azim Uddin ◽  
Faxiang Qin ◽  
Diana Estevez ◽  
Hua-Xin Peng
Keyword(s):  
Wave Scattering ◽  
Simple Structure ◽  
Electromagnetic Properties ◽  
Intrinsic Structure ◽  
Internal Structures ◽  
Scattering Spectra ◽  
Viable Approach ◽  
Transmission Windows ◽  
Strong Scattering ◽  
Varied Amplitude

Previously, we have demonstrated a viable approach based on microstructural and topological modulation of periodically arranged elements to program wave scattering in ferromagnetic glass-coated microwire metacomposites. In order to fully exploit the intrinsic structure of the composite, here, we implement the concept of composites plainification by an in-built vertical interface on randomly dispersed short-cut microwires allowing the adjustment of electromagnetic properties to a larger extent. Such interface was modified through arranging wires with different internal structures in two separated regions and by alternating these regions through wire concentration variations associated with polarization differences across the interface. When the wire concentration was equal in both regions, two well-defined transmission windows with varied amplitude and bandwidth were generated. Wire concentration fluctuations resulted in strong scattering changes ranging from broad passbands to pronounced stopbands, demonstrating the intimate relationship between wire content and space charge variations at the interface. This provides a new method to rationally exploit interfacial effects and microstructural features of microwire metacomposites. Moreover, the advantages of enabling tunable scattering spectra by merely 0.053 vol.% of fillers and simple structure make the proposed plainification strategy instrumental to designing filters with broadband frequency selectivity.

scholarly journals A Scientometric Study of Neurocomputing Publications (1992–2018): An Aerial Overview of Intrinsic Structure

Publications ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 32 ◽  
Author(s):  
Manvendra Janmaijaya ◽  
Amit Shukla ◽  
Ajith Abraham ◽  
Pranab Muhuri
Keyword(s):  
Web Of Science ◽  
Science Research ◽  
Bibliometric Data ◽  
Intrinsic Structure ◽  
Vos Viewer ◽  
Network Cluster ◽  
Internal Structures ◽  
Computer Science Research ◽  
Scientometric Study ◽  
The Web

The international journal of neurocomputing (NC) is considered to be one of the most sought out journals in the computer science research fraternity. In this paper, an extensive bibliometric overview of this journal is performed. The bibliometric data is extracted from the Web of Science (WoS) repository. The main objective of this study is to reveal internal structures and hidden inferences, such as highly productive and influential authors, most contributing countries, top institutions, collaborating authors, and so on. The CiteSpace and VOS viewer is used to visualize the graphical mapping of the bibliometric data. Further, the document co-citations network, cluster detection and references with strong citation burst is analyzed to reveal the intellectual base of NC publications.

scholarly journals Anisotropic radio-wave scattering from englacial water regimes, Mýrdalsjökull, Iceland

2007 ◽  
Vol 53 (182) ◽  
pp. 473-478 ◽  
Author(s):  
Kenichi Matsuoka ◽  
Throstur Thorsteinsson ◽  
Helgi Björnsson ◽  
Edwin D. Waddington
Keyword(s):  
Radio Wave ◽  
Wave Scattering ◽  
Flow Direction ◽  
Low Frequency ◽  
Radio Waves ◽  
Glacier Surface ◽  
Ice Flow ◽  
Scattering Model ◽  
Water Regimes ◽  
Strong Scattering

AbstractColinear-polarized 5 MHz radar profiling data were obtained on Mýrdalsjökull, a temperate glacier in Iceland. Radar transects, and therefore polarization planes, were aligned approximately parallel, transverse and oblique to the ice flow direction. Echoes from the shallower half to two-thirds of the ice were 10–20dB stronger on the oblique and longitudinal transects than those on the transverse transects. Anisotropy as a function of depth is clearly seen at the sites where the transects cross. Strong scattering on longitudinal transects apparently caused extinction of a radar-reflecting layer that was continuously profiled on the transverse transects. A radio-wave scattering model shows that scattering from a longitudinal water-filled conduit parallel to the glacier surface can explain the observed azimuthal variations of the echo. We conclude that low-frequency (~MHz) radio waves can help to characterize englacial water regimes.

scholarly journals Designs and Performance Characteristics of Coated Nanotoroid Antennas

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Sami Ur Rehman ◽  
Junping Geng ◽  
Richard W. Ziolkowski ◽  
Ying Wang ◽  
Xianling Liang ◽  
...  
Keyword(s):  
Plane Wave ◽  
Resonance Frequency ◽  
Wave Scattering ◽  
Electromagnetic Properties ◽  
Purcell Factor ◽  
Active Core ◽  
Radiating Element ◽  
Plane Wave Scattering ◽  
And Performance ◽  
Strong Dipole

The electromagnetic properties of a toroidal coated nanoparticle (T-CNP) antenna with an active core (doped with rare earth erbium Er3+ions) are investigated. It is demonstrated that the active T-CNP acts as a strong dipole radiator at its resonance frequency when it is excited by a plane wave or an electric Hertzian dipole (EHD) radiating element. It is shown that in comparison to being a passive structure, the plane wave scattering cross section of the T-CNP can be increased by nearly 108 dBsm at its resonance frequency when it is active. Moreover, it is further demonstrated that the maximum peak of the power radiated by an EHD element in the presence of a properly designed active T-CNP is more than 120 dB over its value when radiating in free space; that is, its Purcell factor is 1012.

Research on Electromagnetic Actuator of Small Anti-Submarine Weapon

2013 ◽  
Vol 288 ◽  
pp. 188-192
Author(s):  
Jian Xiong
Keyword(s):  
Small Volume ◽  
Simple Structure ◽  
Good Control ◽  
Electromagnetic Properties ◽  
Electromagnetic Actuator ◽  
Excitation Mode ◽  
Two Systems ◽  
Actuator System ◽  
Working Principle

For the application advantages of electromagnetic actuator in anti-submarine weapon, this paper studied two kinds of electromagnetic actuator system and their work modes. It described the working principle, configuration and structure of two systems. It analyzed the electromagnetic properties of electromagnetic actuator and selected the material. When the rudder was the electromagnetic actuator of excitation mode, it possessed many characteristics of small volume, simple structure and good control. The study provided a new scheme of the rudder for small anti-submarine weapon.

A New Approach for Determination of the Attenuation Bandwidth of a Resonating Metamaterial

2016 ◽  
Vol 846 ◽  
pp. 264-269 ◽  
Author(s):  
Arnab Banerjee ◽  
Raj Das ◽  
Emilio P. Calius
Keyword(s):  
Wave Interaction ◽  
Electromagnetic Properties ◽  
Governing Equations ◽  
New Approach ◽  
New Class ◽  
Artificial Materials ◽  
Internal Structures ◽  
The Matrix ◽  
Bloch’S Theorem

Due to the presence of internal structures, metamaterials, a new class of artificial materials, can be engineered to have various unconventional properties during wave interaction. They can be rationally designed to offer controlled mechanical, acoustic or electromagnetic properties through resonant electromagnetic, acoustic or mechanical structures inside the metamaterial. Due to these properties, metamaterials have been effectively used for cloaking, wave guiding and designing filters in the field of optics, electromagnetics, acoustics and elastodynamics. In this paper, a Fourier transfer based methodology is proposed to determine the attenuation bandwidth of a metamaterial instead of using conventional Bloch’s theorem. The applicability of this method is wider than that of Bloch’s theorem, because this method allows analysis beyond the necessary periodicity of the metamaterial. All the governing equations are non-dimensionalised to effectively quantify the attenuation bandwidth at the lower and higher frequency range of the resonating frequency of the internal structures present in the matrix of the material. The attenuation bandwidth is characterized into low and high frequency parts to determine the effect of the variation of the mass ratio and the number of the repeating units on the attenuation bandwidth of the 1D metamaterial chain.

scholarly journals Scattering spectra of dielectric ring: microwave experiments

2021 ◽  
Vol 2015 (1) ◽  
pp. 012144
Author(s):  
Nikolay Solodovchenko ◽  
Mikhail Sidorenko
Keyword(s):  
Ring Resonators ◽  
Electromagnetic Properties ◽  
Microwave Range ◽  
Strong Light ◽  
Scattering Spectrum ◽  
Integrated Optical ◽  
Scattering Spectra ◽  
Resonance Character ◽  
Optical Circuits ◽  
Light Scattering Spectrum

Abstract In recent years, dielectric ring resonators (RRs) have become an essential part of integrated optical circuits. This determines the growing interest in the study of the fundamental electromagnetic properties of these objects, which is far from complete. In particular, in the literature it is difficult to find information about light scattering spectrum, which should demonstrate a strong resonance character when the probe wavelength is comparable to the geometric dimensions of the RR, taking into account its dielectric constant. In this work, we present the results of an experimental study of the electromagnetic properties of a dielectric RR in the microwave range of the spectrum. The results of numerical calculations of the scattering spectrum are also presented, which demonstrate excellent agreement with the experimental data. In addition to the expected resonance character of the spectrum, we report the effects of strong light confinement, which are associated with Fano resonances between the eigenmodes and the component of the electromagnetic field scattered by the ring.

scholarly journals An extended linear shallow-water equation

2019 ◽  
Vol 876 ◽  
pp. 413-427 ◽  
Author(s):  
R. Porter
Keyword(s):  
Small Parameter ◽  
Shallow Water ◽  
Frequency Domain ◽  
Water Wave ◽  
Wave Scattering ◽  
Simple Structure ◽  
Shallow Water Equation ◽  
Three Dimensions ◽  
Numerical Examples ◽  
Variable Topography

An extension to the classical shallow-water equation (SWE) is derived that exactly satisfies the bed condition and can be regarded as an approximation to wave scattering at the next order in the small parameter $(h/\unicode[STIX]{x1D706})^{2}$ (depth to wavelength ratio squared). In the frequency domain, the extended SWE shares the same simple structure as the standard SWE with coefficients modified by terms relating to the bed variation. In three dimensions the governing equation demonstrates that variable topography gives rise to anisotropic effects on wave scattering not present in the standard SWE, with consequences for the design of water wave metamaterials. Numerical examples illustrate that approximations to wave scattering using the extended SWE are significantly improved in comparison with the standard SWE.

Ultrastructure of Giant Mitochondria and Their Inclusions in Schwann Cells of Bovine Splenic Nerve

1974 ◽  
Vol 32 ◽  
pp. 194-195
Author(s):  
Å. Thureson-Klein
Keyword(s):  
Schwann Cells ◽  
Cell Organelles ◽  
Giant Mitochondria ◽  
Matrix Density ◽  
Physiological Conditions ◽  
Unmyelinated Axons ◽  
Internal Structures ◽  
Structural Abnormalities ◽  
Cytotoxic Compounds ◽  
Cell Components

Giant mitochondria of various shapes and with different internal structures and matrix density have been observed in a great number of tissues including nerves. In most instances, the presence of giant mitochondria has been associated with a known disease or with abnormal physiological conditions such as anoxia or exposure to cytotoxic compounds. In these cases degenerative changes occurred in other cell organelles and, therefore the giant mitochondria also were believed to be induced structural abnormalities.Schwann cells ensheating unmyelinated axons of bovine splenic nerve regularly contain giant mitochondria in addition to the conventional smaller type (Fig. 1). These nerves come from healthy inspected animals presumed not to have been exposed to noxious agents. As there are no drastic changes in the small mitochondria and because other cell components also appear reasonably well preserved, it is believed that the giant mitochondria are normally present jin vivo and have not formed as a post-mortem artifact.

Two Investigations into Grain Boundary Structure

1977 ◽  
Vol 35 ◽  
pp. 688-691
Author(s):  
P. Humble
Keyword(s):  
Grain Boundary ◽  
Dark Field ◽  
Boundary Structure ◽  
Boundary Dislocation ◽  
Bright Field ◽  
Intrinsic Structure ◽  
Weak Beam ◽  
Grain Boundary Structure ◽  
Independent Information ◽  
Diffraction Patterns

There has been sustained interest over the last few years into both the intrinsic (primary and secondary) structure of grain boundaries and the extrinsic structure e.g. the interaction of matrix dislocations with the boundary. Most of the investigations carried out by electron microscopy have involved only the use of information contained in the transmitted image (bright field, dark field, weak beam etc.). Whilst these imaging modes are appropriate to the cases of relatively coarse intrinsic or extrinsic grain boundary dislocation structures, it is apparent that in principle (and indeed in practice, e.g. (1)-(3)) the diffraction patterns from the boundary can give extra independent information about the fine scale periodic intrinsic structure of the boundary.In this paper I shall describe one investigation into each type of structure using the appropriate method of obtaining the necessary information which has been carried out recently at Tribophysics.

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