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Relevant bibliographies by topics / Structural parameter of refractive index / Dissertations / Theses

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Dissertations / Theses on the topic 'Structural parameter of refractive index'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Uddin, Md Jasim. "Synthesis and analysis of metamaterial structure for microwave frequency applications." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/107850/1/Md.%20Jasim_Uddin_Thesis.pdf.

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This thesis involves analysis of artificial materials to investigate metamaterial behavior and characteristics. Extraction techniques are used to validate the electromagnetic properties and different microwave applications are investigated. A new geometric structure is designed using dual star split ring resonator, which introduces a sharp, wide rejection band. A metamaterial microwave absorber suitable for dual-band operation and insensitive to incident polarization was also developed.

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2

Maluš, Miroslav. "Komplexní model turbulence pro různé velikosti cel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442416.

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This diploma thesis is about creating a program to model turbulent cells of different sizes on the chosen transmission path. The initial part of the work is devoted to the formation of atmospheric turbulence and the mathematical description of the extent of turbulence and its effect on optical waves. The methods of the turbulence generation and their physical description of formation are described below. The practical part is devoted to the created program in the MATLAB.

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3

Děcká, Klára. "Interferometrické měření fázových změn optického svazku v turbulenci." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377040.

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This master’s thesis deals with the impact of atmospheric turbulence on phase changes of a free space optical signal. This problematic is investigated by the interferometric method. A part of the thesis is focused on the phenomenon of atmospheric turbulence. Then the physical effect of interference is discussed and optical interferometers are described. The experimental part of the thesis is focused on measurement of phase shift of optical signal by interferometric method. The result of the thesis is to determine how phase shift of an optical beam depends on the strength of turbulence.

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4

Aubrecht, Ondřej. "Studium profilu strukturního parametru indexu lomu v atmosféře." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219818.

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This work is dedicated to structural parameter of the refractive index in the atmosphere Cn2 and his various models. For comparison the models are simulated only for one area and only for one day. The work represented the influence of atmospheric turbulence on the communication environment and on the individual models. In addition this work is for selected areas and for the input conditions created program for modeling of structural parameters and meteorological data in the atmosphere

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5

Rydström, Sara. "Regularization of Parameter Problems for Dynamic Beam Models." Licentiate thesis, Växjö University, School of Mathematics and Systems Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-7367.

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<p>The field of inverse problems is an area in applied mathematics that is of great importance in several scientific and industrial applications. Since an inverse problem is typically founded on non-linear and ill-posed models it is a very difficult problem to solve. To find a regularized solution it is crucial to have <em>a priori</em> information about the solution. Therefore, general theories are not sufficient considering new applications.</p><p>In this thesis we consider the inverse problem to determine the beam bending stiffness from measurements of the transverse dynamic displacement. O

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6

Kovaľová, Soňa. "Interferometrické měření optického signálu v turbulenci." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401960.

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The aim of this thesis is to quantify the impact of atmospheric turbulence on optical signal used in free space optic communication systems. The first part is associated with atmosphere as transmission medium. Following part deals with interferometry and components of interferometers. Various methods of analysis of trasmission environment for optical beam are introduced theoretically and experimentally. Mathematical apparatus based on Kolmogorov’s cascade theory, Rytov’s variance was used to find value of structural parameter of refraction as a main measure of turbulence intensity. Experimenta

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7

Yang, Zepeng. "Bird-inspired self-assembly of hollow nanoparticles." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590589915703906.

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8

Bárta, Miroslav. "Vliv atmosférických turbulencí na optický svazek." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218156.

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The aim of this thesis is to study a free space optics and its application in communication technologies. It describes possible interrupting impacts on the beamed optical signal, which are signal noise, attenuation of the atmosphere and atmospheric turbulence. The basis of the thesis is to describe the impact of the atmospheric turbulences on the optical beam. Fluctuation of optical intensity in the optical beam has been measured and index of refraction structure parameter calculated. With its assistance, turbulence rate has been determined.

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9

Pepenene, Refuoe Donald. "Macroscopic and Microscopic surface features of Hydrogenated silicon thin films." University of the Western Cape, 2018. http://hdl.handle.net/11394/6414.

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Magister Scientiae - MSc (Physics)<br>An increasing energy demand and growing environmental concerns regarding the use of fossil fuels in South Africa has led to the challenge to explore cheap, alternative sources of energy. The generation of electricity from Photovoltaic (PV) devices such as solar cells is currently seen as a viable alternative source of clean energy. As such, crystalline, amorphous and nanocrystalline silicon thin films are expected to play increasingly important roles as economically viable materials for PV development. Despite the growing interest shown in these materials,

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10

Onelli, Olimpia Domitilla. "Complex photonic structures in nature : from order to disorder." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273768.

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Structural colours arise from the interaction of visible light with nano-structured materials. The occurrence of such structures in nature has been known for over a century, but it is only in the last few decades that the study of natural photonic structures has fully matured due to the advances in imagining techniques and computational modelling. Even though a plethora of different colour-producing architectures in a variety of species has been investigated, a few significant questions are still open: how do these structures develop in living organisms? Does disorder play a functional role in

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11

Chan, Chun-Fan. "Side-polished and tilted fiber Bragg grating refractive index sensors for structural health monitoring applications." 2007. http://hdl.handle.net/1993/29469.

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12

Ahmed, Farid. "Development of Fiber Optic Sensors using Femtosecond Laser for Refractive Index and Temperature Measurements." Thesis, 2015. http://hdl.handle.net/1828/6995.

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The development and transition of optical fiber sensors from experimental stage to practical applications largely depends on manufacturing cost and simplicity. To date, in-fiber grating sensors are largely manufactured by ultraviolet lasers despite higher fabrication cost and complexity. Besides, ultraviolet radiation can only write gratings in doped fibers. Therefore, reaping the benefits of existing fibers such as pure silica fiber, photonics crystal fibers etc. cannot be achieved using this technique. In contrast, uses of ultra-fast lasers have the potential to eliminate or minimize those d

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13

吳維珉. "Applying Stiffness Revise Index and Unsupervised Fuzzy Neural Network in Structural Stiffness Parameter Updating." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87u2gz.

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碩士<br>國立交通大學<br>土木工程系所<br>105<br>This work presents an effective approach for updating structural stiffness parameters from measured incomplete modal data via external excitations, such as earthquakes. The proposed method is based on an iterative approach with two significant strategies. The first strategy is a particle-based random search cooperating with a stiffness revise index. The index is a heuristic notion from structural engineering, and assists to guide the search direction in global for each particle during iterations. This strategy will be stopped when the search procedure approache

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14

You, Cheng-Han, and 游承翰. "Applying Stiffness Revise Index and Weight and Elite Strategy of Unsupervised Fuzzy Neural Network in Structural Stiffness Parameter Updating." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/sm53dh.

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碩士<br>國立交通大學<br>土木工程系所<br>106<br>The method of structural parameter updating has been developed for decades. In most modal, frequency is the most known conditions for structural parameters updating. In this study, it is proposed that the efficiency of structural parameters’ modification and the stability of the solution are both taken into account in the case of partial modal data and incomplete measurement points. There are two stages in this method: the first stage is the stiffness revise index stage, and the second stage is the unsupervised fuzzy neural network of the elite strategy. The fi

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15

Kandic, Miodrag. "Asymptotic limits of negative group delay phenomenon in linear causal media." 2011. http://hdl.handle.net/1993/4958.

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Abnormal electromagnetic wave propagation characterized by negative group velocity and consequently negative group delay (NGD) has been observed in certain materials as well as in artificially built structures. Within finite frequency intervals where an NGD phenomenon is observed, higher frequency components of the applied waveform are propagated with phase advancement, not delay, relative to the lower frequency components. These media have found use in many applications that require positive delay compensation and an engineered phase characteristic, such as eliminating phase variation with fr

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