scholarly journals Focusing and energy dispersion properties of a cylindrically bent asymmetric Laue crystal

2019 ◽  
Author(s):  
Peng Qi ◽  
Xianbo Shi ◽  
Nazanin Samadi ◽  
Dean Chapman
Keyword(s):  
Energy Dispersion ◽  
Dispersion Properties

Tuning of energy dispersion properties in InAlAs digital alloys

2019 ◽  
Vol 125 (24) ◽  
pp. 245702
Author(s):  
J. Zheng ◽  
Y. Tan ◽  
Y. Yuan ◽  
A. W. Ghosh ◽  
J. C. Campbell
Keyword(s):  
Energy Dispersion ◽  
Dispersion Properties ◽  
Digital Alloys

Optical data signals in fiber optic communication links with fading

2019 ◽  
pp. 94-104
Author(s):  
I. Juwiler ◽  
I. Bronfman ◽  
N. Blaunstein
Keyword(s):  
Spectral Efficiency ◽  
Fiber Optic ◽  
Fiber Optic Cable ◽  
Optical Signals ◽  
Dispersion Properties ◽  
Optical Cable ◽  
Time Dispersion ◽  
Communication Links ◽  
Fiber Optic Communication ◽  
Optic Communication

Introduction: This article is based on the recent research work in the field of two subjects: signal data parameters in fiber optic communication links, and dispersive properties of optical signals caused by non-homogeneous material phenomena and multimode propagation of optical signals in such kinds of wired links.Purpose: Studying multimode dispersion by analyzing the propagation of guiding optical waves along a fiber optic cable with various refractive index profiles of the inner optical cable (core) relative to the outer cladding, as well as dispersion properties of a fiber optic cable due to inhomogeneous nature of the cladding along the cable, for two types of signal code sequences transmitted via the cable: return-to-zero and non-return-to-zero ones.Methods: Dispersion properties of multimode propagation inside a fiber optic cable are analyzed with an advanced 3D model of optical wave propagation in a given guiding structure. The effects of multimodal dispersion and material dispersion causing the optical signal delay spread along the cable were investigated analytically and numerically.Results: Time dispersion properties were obtained and graphically illustrated for two kinds of fiber optic structures with different refractive index profiles. The dispersion was caused by multimode (e.g. multi-ray) propagation and by the inhomogeneous nature of the material along the cable. Their effect on the capacity and spectral efficiency of a data signal stream passing through such a guiding optical structure is illustrated for arbitrary refractive indices of the inner (core) and outer (cladding) elements of the optical cable. A new methodology is introduced for finding and evaluating the effects of time dispersion of optical signals propagating in fiber optic structures of various kinds. An algorithm is proposed for estimating the spectral efficiency loss measured in bits per second per Hertz per each kilometer along the cable, for arbitrary presentation of the code signals in the data stream, non-return-to zero or return-to-zero ones. All practical tests are illustrated by MATLAB utility.

Dispersion properties and dynamics of ladder-like meta-chains

2021 ◽  
Vol 43 ◽  
pp. 101133
Author(s):  
Setare Hajarolasvadi ◽  
Ahmed E. Elbanna
Keyword(s):  
Dispersion Properties

Dispersion properties of high-Q passive and active single or coupled resonators

2009 ◽  
Author(s):  
Yannick Dumeige ◽  
Stéphane Trébaol ◽  
Hervé Tavernier ◽  
Patrice Féron
Keyword(s):  
Coupled Resonators ◽  
High Q ◽  
Dispersion Properties

scholarly journals Elementary chemical analysis in leaves infected by fumagina by X-Ray fluorescence technique

2007 ◽  
Vol 50 (5) ◽  
pp. 851-860 ◽  
Author(s):  
Maria Sélia Blonski ◽  
Carlos Roberto Appoloni ◽  
Paulo Sérgio Parreira ◽  
Pedro Henrique Arruda Aragão ◽  
Virgilio Franco Nascimento Filho
Keyword(s):  
Chemical Composition ◽  
Chemical Analysis ◽  
Fluorescence Technique ◽  
Energy Dispersion ◽  
X Ray ◽  
Set Up ◽  
Elementary Chemical ◽  
Cu And Zn

Energy Dispersion X-Ray Fluorescence Technique (EDXRF) was employed to study the effects of the fumagina disease on the elementary chemical composition of the leaves. The experimental set up consisted of a Mo X-ray tube (Ksub<FONT FACE=Symbol>µ</FONT> = 17.44 keV) with Zr filter and a Si (Li) detector. The measurements were performed with the infected and healthy leaves of citric plants. The elements Ti, Mn, Fe, Cu and Zn were quantified, with an average DL of 69, 12, 8, 4 and 4 µg.g-1 respectively. The obtained concentration for Fe varied from 44 to 192 µg.g-1 in healthy leaves and from 363 to 704 µg.g-1 in infected leaves with fumagina .

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