periodic structure
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2021 ◽  
Author(s):  
Carlos Molero Jiménez

This paper presents a versatile full-metal 3D periodic structure based on square waveguides with non-closed resonators perforated on their walls. The complex unit-cell architecture is modelled via accurate equivalent circuits, previously characterized. The circuit model predicts the excitation of phase resonance, which will be used to optimize and design different functionalities, such as polarisation converters or absorption.


2021 ◽  
Author(s):  
Carlos Molero Jiménez

This paper presents a versatile full-metal 3D periodic structure based on square waveguides with non-closed resonators perforated on their walls. The complex unit-cell architecture is modelled via accurate equivalent circuits, previously characterized. The circuit model predicts the excitation of phase resonance, which will be used to optimize and design different functionalities, such as polarisation converters or absorption.


2021 ◽  
Vol 144 ◽  
pp. 107402
Author(s):  
N.N. Nedyalkov ◽  
A. Dikovska ◽  
R. Nikov ◽  
G. Atanasova ◽  
S. Hayashi ◽  
...  

2021 ◽  
Vol 2140 (1) ◽  
pp. 012015
Author(s):  
A V Badin ◽  
A I Berdyugin ◽  
V D Moskalenko ◽  
K V Simonova ◽  
R P Gursky

Abstract This paper considers the development and application of a system of reflectometry for the analysis of the homogeneity of structures manufactured by additive technologies. A system of reflectometry based on a backward wave oscillator, a two-dimensional object positioning system and an optoacoustic detector (Goley cell) is described. The results of reflectometry of the hexagonal periodic structure of cells based on acrylonitrile butadiene styrene at a wavelength of 343 microns are presented.


2021 ◽  
pp. 447-466
Author(s):  
Yılmaz AKDİ ◽  
Yunus Emre KARAMANOĞLU ◽  
Kamil Demirberk ÜNLÜ ◽  
Cem BAŞ

2021 ◽  
Author(s):  
Max Hofmann ◽  
Lucas Biller ◽  
Uwe Michel ◽  
Mathias Bähr ◽  
Jan Christoph Koch

The axonal cytoskeleton is organized in a highly periodic structure, the membrane-associated periodic skeleton (MPS), which is essential to maintain the structure and function of the axon. Here, we use stimulated emission depletion microscopy (STED) of primary rat cortical neurons in microfluidic chambers to analyze the temporal and spatial sequence of MPS formation at the distal end of growing axons and during regeneration after axotomy. We demonstrate that the MPS does not extend continuously into the growing axon but develops from patches of periodic β-spectrin II arrangements that grow and coalesce into a continuous scaffold. We estimate that the underlying sequence of nucleation, elongation, and subsequent coalescence of periodic β-spectrin II patches takes around 15 hours. Strikingly, we find that development of the MPS occurs faster in regenerating axons after axotomy and note marked differences in the morphology of the growth cone and adjacent axonal regions between regenerating and unlesioned axons. Moreover, we find that inhibition of the spectrin-cleaving enzyme calpain accelerates MPS formation in regenerating axons and increases the number of regenerating axons after axotomy. Taken together, we provide here a detailed nanoscale analysis of MPS development in growing axons.


2021 ◽  
Vol 2090 (1) ◽  
pp. 012070
Author(s):  
Hugo Aya Baquero

Abstract This model consists of a periodic structure formed by solid beams equidistant from each other submerged in a fluid. The beams are clamped at both ends. The distance between the beams, the elastic properties of the solid and the fluid; and the geometric parameters of the beams determine a relationship between the frequencies of the mechanical waves that can propagate through the structure and the wave vector. Analysis within the first Brillouin zone with the Bloch periodicity condition gives rise to frequency bands in which there is the propagation of mechanical waves and bands in which no waves are propagated. Some propagation bands and forbidden regions were found in the examined frequency ranges for various geometric configurations.


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