scholarly journals Chiral All-Dielectric Metasurface Based on Elliptic Resonators with Circular Dichroism Behavior

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Ali Yahyaoui ◽  
Hatem Rmili
Keyword(s):  
Circular Dichroism ◽  
Design Procedure ◽  
Design Parameters ◽  
Dielectric Resonators ◽  
Polarization Filter ◽  
Microwave Frequencies ◽  
Main Design ◽  
Circular Polarizer ◽  
Circular Dichroïsm ◽  
Dielectric Metasurface

We present the design of a new microwave all-dielectric chiral metasurface with circular dichroism behavior based on elliptic dielectric resonators (EDRs). During the design procedure, we have first optimized numerically the effects of the main design parameters such as the resonator’s size and orientation, as well as the size of the slot within them, on the metasurface transmission over the frequency band 10–20 GHz. Measurements on the final metasurface prototype have shown a large circular dichroism (Δ=0.61 and Δ=0.5) over two bands (17.55–17.61 GHz and 17.91–18.05 GHz) with ellipticities close to 45° which means that the developed device can be used as a circular polarization filter and circular polarizer at microwave frequencies.

scholarly journals Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties

2010 ◽  
Vol 17 (4) ◽  
pp. 39-45 ◽  
Author(s):  
Wojciech Litwin
Keyword(s):  
Design Procedure ◽  
Life Time ◽  
Lubricating Oil ◽  
Design Parameters ◽  
Propeller Shaft ◽  
Main Design ◽  
Classical Systems ◽  
Friction Regime ◽  
Highly Sensitive ◽  
Ship Propeller

Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties In recent years more and more frequently can be met ships in which propeller shaft water-lubricated polymer bearings have been applied. It results from their simplicity and associated relatively low initial and operational cost as compared with the complex classical sealed system based on oil-lubricated bearings. It is worth mentioning that the water-lubricated bearings are also environmentally friendly as no risk of pollution with lubricating oil used in classical systems, is involved. Design procedure of bearings in question based on materials made available by producers is relatively simple. However it turns out that choice of an appropriate sliding material, clearance value and optimum arrangement of lubricating grooves may greatly influence bearing's properties. As results from the performed research investigations, bearing of the kind is a highly sensitive unit. Problems of choosing a suitable bearing clearance, designing an optimum bush geometry, selecting a proper bush material are crucial for life time of the bearing. In particular the problem is in forming hydrodynamical properties of bearing as owing to its operation in the fluid friction regime durability of bearings, the very responsible units of propulsion transmission system, can be greatly extended.

scholarly journals Multiband Circular Polarizer Based on Fission Transmission of Linearly Polarized Wave forX-Band Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Farman Ali Mangi ◽  
Shaoqiu Xiao ◽  
Ghulam Ali Mallah ◽  
Deedar Ali Jamro ◽  
Imran Memon ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Normal Incidence ◽  
Orthogonal Vector ◽  
Circular Polarizer ◽  
Transmitted Waves ◽  
Linearly Polarized ◽  
Orthogonal Components ◽  
Chain Transmission ◽  
The Right ◽  
Circular Dichroïsm

A multiband circular polarizer based on fission transmission of linearly polarized wave forx-band application is proposed, which is constructed of 2 × 2 metallic strips array. The linear-to-circular polarization conversion is obtained by decomposing the linearly incidentx-polarized wave into two orthogonal vector components of equal amplitude and 90° phase difference between them. The innovative approach of “fission transmission of linear-to-circular polarized wave” is firstly introduced to obtain giant circular dichroism based on decomposition of orthogonal vector components through the structure. It means that the incident linearly polarized wave is converted into two orthogonal components through lower printed metallic strips layer and two transmitted waves impinge on the upper printed strips layer to convert into four orthogonal vector components at the end of structure. This projection and transmission sequence of orthogonal components sustain the chain transmission of electromagnetic wave and can achieve giant circular dichroism. Theoretical analysis and microwave experiments are presented to validate the performance of the structure. The measured results are in good agreement with simulation results. In addition, the proposed circular polarizer exhibits the optimal performance with respect to the normal incidence. The right handed circularly polarized wave is emitted ranging from 10.08 GHz to 10.53 GHz and 10.78 GHz to 11.12 GHz, while the left handed circular polarized wave is excited at 10.54 GHz–10.70 GHz and 11.13 GHz–11.14 GHz, respectively.

scholarly journals All-dielectric metasurface circular dichroism waveplate

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Jingpei Hu ◽  
Xiaonan Zhao ◽  
Yu Lin ◽  
Aijiao Zhu ◽  
Xiaojun Zhu ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Circular Dichroïsm ◽  
Dielectric Metasurface

Soft x-ray circular polarizer using magnetic circular dichroism at the Fe L3 line

1997 ◽  
Vol 71 (11) ◽  
pp. 1446-1448 ◽  
Author(s):  
J. B. Kortright ◽  
S.-K. Kim ◽  
T. Warwick ◽  
N. V. Smith
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Circular Polarizer ◽  
Circular Dichroïsm

Characterization of Tamm-Horsfall Urinary Glycoprotein

1973 ◽  
Vol 31 ◽  
pp. 420-421
Author(s):  
John P. Robinson ◽  
J. David Puett
Keyword(s):  
Electron Microscopy ◽  
Circular Dichroism ◽  
Secondary Structure ◽  
Quaternary Structure ◽  
Normal Adult ◽  
Morphological Properties ◽  
Adult Males ◽  
Circular Dichroïsm ◽  
Urinary Glycoprotein

Much work has been reported on the chemical, physical and morphological properties of urinary Tamm-Horsfall glycoprotein (THG). Although it was once reported that cystic fibrotic (CF) individuals had a defective THG, more recent data indicate that THG and CF-THG are similar if not identical.No studies on the conformational aspects have been reported on this glycoprotein using circular dichroism (CD). We examined the secondary structure of THG and derivatives under various conditions and have correlated these results with quaternary structure using electron microscopy.THG was prepared from normal adult males and CF-THG from a 16-year old CF female by the method of Tamm and Horsfall. CF female by the method of Tamm and Horsfall.

Circular dichroism spectra of adsorbed dye-aggregates

1968 ◽  
Vol 65 ◽  
pp. 146-151 ◽  
Author(s):  
G. Scheibe ◽  
O. Wörz ◽  
F. Haimerl ◽  
W. Seiffert ◽  
J. Winkler
Keyword(s):  
Circular Dichroism ◽  
Circular Dichroism Spectra ◽  
Circular Dichroïsm
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