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Dissertations / Theses on the topic 'Numerical aperture'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Munro, Peter Robert Thomas. "Application of numerical methods to high numerical aperture imaging." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427816.

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2

Flagello, Donis George. "High numerical aperture imaging in homogeneous thin films." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186395.

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This dissertation investigates imaging phenomena by lenses of high relative numerical aperture (NA) in the first layer of a homogeneous thin film stack. The imaging is described by a high NA model that combines elements of vector imaging theory with traditional thin-film optics. Various examples are studied with an emphasis on analyzing the polarization effects of the illumination. Experiments are shown that verify aspects of the model. A brief review of the development of high NA imaging theory is given. The use of the Debye approximation dominates most of the previous work. Investigation of

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3

O'Connor, Arthur Bruce 1963. "Polarization properties of high numerical aperture holographic optical elements." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277172.

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The polarization dependent diffraction efficiency and imaging properties of high numerical aperture (N.A.) holographic optical elements (HOEs) were investigated to determine the suitability of these elements for magneto-optic data storage head applications. Two-wave first-order coupled wave theory was combined with a local planar grating model to determine the s and p-polarization diffraction efficiency characteristics of these HOEs. Experimental results for 0.55 N.A. focusing HOEs fabricated in silver halide photographic emulsions and dichromated gelatin films demonstrated that the p-to-s-pol

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4

Cheng, Chin-Yuan. "Numerical electromagnetic modeling of a small aperture helical-fed reflector antenna." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176838193.

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5

Ament, Craig A. "High numerical aperture axial and transverse beam shaping using diffractive optics." Honors in the Major Thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1348.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.<br>Bachelors<br>Sciences<br>Physics

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6

Messelink, W. A. C. M. "Numerical methods for the manufacture of optics using sub-aperture tools." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1471480/.

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Moore's law, predicting a doubling of transistor count per microprocessor every two years, remains valid, demonstrating exponential growth of computing power. This thesis examines the application of numerical methods to aid optical manufacturing for a number of case-studies related to the use of sub-aperture tools. One class of sub-aperture tools consists of rigid tools which are well suited to smooth surfaces. Their rigidity leads to mismatch between the surfaces of tool and aspheric workpieces. A novel, numerical method is introduced to analyse the mismatch qualitatively and quantitatively,

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7

Mokamati, Satyanarayana V. "Effect of aperture geometry on the steady flow through the narrow apertures in a pulp screen : numerical and experimental study." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31439.

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This investigation examines turbulent flow across a contoured wall with evenly-spaced slots and a series of flow bifurcations, as found in industrial pulp screening. The contoured wall and slotted apertures are formed from an array of 'wires', with cross-sectional geometry characterized by contour height and wire width. Four complementary studies were conducted to examine the velocity and turbulence characteristics of this complex flow. In the first study, a Computational Fluid Dynamics (CFD) model was developed to theoretically examine the effect of wire cross-sectional geometry on the flow f

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Chidley, Matthew D. "High Numerical Aperture Injection-Molded Miniature Objective For Fiber-Optic Confocal Reflectance Microscopy." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1300%5F1%5Fm.pdf&type=application/pdf.

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9

Romero, Carlos Alberto Macias. "High numerical aperture Muller matrix polarimetry and applications to multiplexed optical data storage." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517617.

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10

Jabbour, Toufic. "DESIGN, ANALYSIS, AND OPTIMIZATION OF DIFFRACTIVE OPTICAL ELEMENTS UNDER HIGH NUMERICAL APERTURE FOCUSING." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2837.

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The demand for high optical resolution has brought researchers to explore the use of beam shaping diffractive optical elements (DOEs) for improving performance of high numerical aperture (NA) optical systems. DOEs can be designed to modulate the amplitude, phase and/or polarization of a laser beam such that it focuses into a targeted irradiance distribution, or point spread function (PSF). The focused PSF can be reshaped in both the transverse focal plane and along the optical axis. Optical lithography, microscopy and direct laser writing are but a few of the many applications in which a prope

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Macias, Romero Carlos Alberto. "High numerical aperture Mueller matrix polarimetry and applications to multiplexed optical data storage." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5597.

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Optical data storage has reached a point where it is no longer possible to increase the storage capacity of an optical disk by conventional means. The work presented here, however, proves experimentally the validity of a novel solution to increase the capacity of an optical disk. Polarisation is used to store information multiplexed into shape-birefringent pits. A high numerical aperture scanning confocal microscope capable of measuring the Muller matrix of a sample is built to measure and characterise the polarisation properties of such pits. A number of results found during the development o

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12

Özdemir, Aytekin, Zeki Hayran, Yuzuru Takashima, and Hamza Kurt. "Polarization independent high transmission large numerical aperture laser beam focusing and deflection by dielectric Huygens’ metasurfaces." ELSEVIER SCIENCE BV, 2017. http://hdl.handle.net/10150/625955.

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In this letter, we propose all-dielectric Huygens' metasurface structures to construct high numerical aperture flat lenses and beam deflecting devices. The designed metasurface consists of two-dimensional array of all dielectric nanodisk resonators with spatially varying radii, thereby introducing judiciously designed phase shift to the propagating light. Owing to the overlap of Mie-type magnetic and electric resonances, high transmission was achieved with rigorous design analysis. The designed flat lenses have numerical aperture value of 0.85 and transmission values around 80%. It also offers

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13

Jia, Baohua, and n/a. "A study on the complex evanescent focal region of a high numerical aperture objective and its applications." Swinburne University of Technology, 2006. http://adt.lib.swin.edu.au./public/adt-VSWT20070205.150740.

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In recent years, optical near-field has received an ever-increasing attention owing to its ability to localise optical signals beyond the diffraction limit. Optical near-field is a non-propagating field existing in the close vicinity of a matter within a range less than the wavelength of the illumination light and it carries the high spatial frequency information showing the fine details of the matter. An optical near-field can be generated by a near-field optical microscope with a nano-aperture or a metal-coated fibre tip. However, common difficulties associated with this approach, such as a

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14

Jia, Baohua. "A study on the complex evanescent focal region of a high numerical aperture objective and its applications." Australasian Digital Thesis Program, 2006. http://adt.lib.swin.edu.au/public/adt-VSWT20070205.150740/index.html.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, Centre for Micro-Photonics, 2005.<br>A thesis submitted for the degree of Doctor of Philosophy, Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, 2005. Typescript. Bibliography: p. 129-142.

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15

Jo, Sseunhyeun. "The vector behavior of aberrations in high numerical aperture (0.9 < NA < 3.1) laser focusing systems." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/290467.

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This dissertation investigates vector behavior of aberrations for high numerical aperture optical systems using a solid immersion lens (SIL). In order to analyze the system, this dissertation introduces the illumination system transfer function (ISTF), which is a map in the space of the exit pupil that shows reflection and transmission properties of individual plane waves that are emitted from corresponding points in the exit pupil. A vector analysis using ISTF presents the role of propagating and evanescent energy in the SIL systems, where the boundary between the them is defined by total int

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Abdel-Rahman, Mohamed A. "Numerical Reconstruction and Applications of Acoustic and Electromagnetic Ultra-Wideband Localized Pulses Generated by Dynamic Aperture Antennas." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/26335.

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A study is undertaken of the numerical reconstruction of acoustic and electromagnetic (EM) localized waves (LWs). The latter are carrier-free ultra-wideband pulses characterized by large focusing depths and extended ranges of localization. Special emphasis is placed on finite energy LWs that can be generated by dynamic aperture antennas with independently addressable elements. The reconstruction techniques are based on Huygens and Rayleigh-Sommerfeld integral I and II representations, both in the time and frequency domains. In contradistinction to the Weyl representation,they lend themselves t

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17

Li, Qinggele. "Optimization of point spread function of a high numerical aperture objective lens : application to high resolution optical imaging and fabrication." Thesis, Cachan, Ecole normale supérieure, 2014. http://www.theses.fr/2014DENS0059/document.

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Ce travail de thèse porte sur la caractérisation et l'optimisation du spot de focalisation d'un objectif de microscope de grande ouverture numérique pour des applications d'imagerie super-résolue et de nanofabrication.Dans la première partie, nous avons systématiquement étudié les distributions de polarisation et d'intensité du faisceau laser dans la région du point focal en fonction de différents paramètres du faisceau incident tels que la phase, la polarisation, l’amplitude ainsi que l'influence du milieu de propagation, tel que l’indice de réfraction. Nous avons mis en oeuvre différentes mé

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18

Hill, Katherine I. "DNAPL migration in single fractures : issues of scale, aperture variability and matrix diffusion." University of Western Australia. School of Environmental Systems Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0003.

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[Truncated abstract] To date, many subsurface contaminant modelling studies have focused on increasing model complexity and measurement requirements to improve model accuracy and widen model application. However, due to the highly complex and heterogeneous nature of flow in the subsurface, the greater benefit in model development may lie in decreasing complexity by identifying key processes and parameters, simplifying the relationships that exist between them, and incorporating these relationships into simple models that recognise or quantify the inherent complexity and uncertainty. To address

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19

Somers, Gary A. "Efficient numerical and asymptotic analyses of the dyadic aperture Green's function for a grounded material slab and its application to slot arrays /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487844105976161.

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20

Walsh, Jason L., and jason walsh@rmit edu au. "Development & evaluation of multiple optical trapping of colloidal particles using computer generated structured light fields." RMIT University. Applied Sciences, 2010. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20100209.143544.

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Colloidal particles are small particles ranging in size from nanometres to micrometres suspended in a fluid. Amongst many scientific and biological applications, they have been used to model crystallisation, vitrification, and particle interactions along with the use of colloidal model systems for the study of the fundamental nature of the fluid-crystal and fluid-glass phase transitions. It has been shown that colloidal particles can be trapped and manipulated using strongly-focused light beams known as optical tweezers, and this has paved the way for research into the area of micromanipula

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Mehrotra, Prateek. "High Aspect Ratio Lithographic Imaging at Ultra-high Numerical Apertures: Evanescent Interference Lithography with Resonant Reflector Underlayers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2012. http://hdl.handle.net/10092/6935.

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A near-field technique known as evanescent interferometric lithography allows for high resolution imaging. However its primary limitation is that the image exponentially decays within the photoresist due to physical limits. This thesis aims to overcome this limitation and presents a method to considerably enhance the depth of focus of images created using evanescent interferometric lithography by using a material underlay beneath the photoresist. A key enabler of this is the understanding that evanescent fields couple to surface states and operating within proximity of a resonance, the streng

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22

Kučera, Zdeněk. "Měření parametrů optických spojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220660.

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Communication via fiber optical cable (links) is the latest advancement of the transmission media currently used for data transmission. Despite initial problems, using of this medium in recent years has greatly expanded due to their indisputable advantages. Optical cable is a great combination of reliability and security of data transfer. Its constantly improving transmission parameters contribute to the high speeds in the long-distance transmission of data. In the theoretical part of this work some kinds of optical cables are mentioned, also the most important parameters and the most widely u

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23

Issa, Nader. "Modes and propagation in microstructured optical fibres." University of Sydney. Physics and Optical Fibre Technology Centre, 2005. http://hdl.handle.net/2123/613.

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Microstructured optical fibres (MOFs), also commonly called photonic crystal fibres or holey fibres, describe a type of optical fibre in which continuous channels of (typically) air run their entire length. These `holes' serve to both confine electromagnetic waves within the core of the fibre and to tailor its transmission properties. In order to understand and quantify both of these functions, a new computational algorithm was developed and implemented. It solves for the eigenvalues of Maxwell's wave equations in the two-dimensional waveguide cross-section, with radiating boundary conditions

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Pritschet, Andreas [Verfasser], and Josef [Akademischer Betreuer] Zweck. "Numerical and experimental investigations of Boersch Phase Plate equipped Condenser Apertures for use in Electron Magnetic Circular Dichroism experiments in a Transmission Electron Microscope / Andreas Pritschet. Betreuer: Josef Zweck." Regensburg : Universitätsbibliothek Regensburg, 2014. http://d-nb.info/1046721720/34.

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25

Marchiori, Victor. "Extraction photométrique bord des étoiles de la mission PLATO : masques photométriques optimaux pour la détection de planètes extra-solaires In-flight photometry extraction of PLATO targets Optimal apertures for detecting extrasolar planets The PLATO Solar-like Light-curve Simulator A tool to generate realistic stellar light-curves with instrumental effects representative of the PLATO mission." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEO014.

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PLAnetary Transits and Oscillations of stars (PLATO) est une mission scientifique spatiale européenne dédiée à la sismologie stellaire et à la recherche d’exoplanètes, et dont le développement est coordonné par l’Agence Spatiale Européenne. Avec un intérêt majeur sur des planètes du type terrestre située dans la zone habitable des étoiles du type solaire de la séquence principale, cette mission repose sur de la photométrie de très haute précision et exige une très grande stabilité des mesures. Elle s’appuie sur des techniques bien éprouvées : la méthode de transits pour la détection des planèt

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26

Patier, Laurent. "Etude de techniques de calculs multi-domaines appliqués à la compatibilité électromagnétique." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00834164.

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Le contexte d'étude est celui de la Compatibilité ÉlectroMagnétique (CEM). L'objectif de la CEM est, comme son nom l'indique, d'assurer la compatibilité entre une source de perturbation électromagnétique et un système électronique victime. Or, la prédiction de ces niveaux de perturbation ne peut pas s'effectuer à l'aide d'un simple calcul analytique, en raison de la géométrie qui est généralement complexe pour le système que l'on étudie, tel que le champ à l'intérieur d'un cockpit d'avion par exemple. En conséquence, nous sommes contraints d'employer des méthodes numériques, dans le but de pré

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YANG, KAI-MING, and 楊凱茗. "Simulation and Design of Numerical Aperture Expander." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/2c5b8p.

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Fang, Chun-Chieh, and 方俊傑. "Experiement and simulation on the continuous numerical aperture proposition of sub-wavelength annular aperture." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/52292697390053020848.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>96<br>The three-dimensional electromagnetic field dispersion of focused beam is an important issue for optical applications. Since 1959, Richard and Wolf had generated radially polarized (RP) beam by optical mechanism. After that, radial vector beam has attracted a great deal of discussions in recent years. Using sub-wavelength annular aperture (SAA) structure is a brand new method to generate non-diffraction doughnut beam. When the RP beam is focused by SAA structure, the focused RP beam in free space was found to propagate in the J1 Bessel beam format, Bot

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Chu, Kuan-Ju, and 朱冠儒. "Image Modeling for a High Numerical Aperture Microlithography System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/74606125552720114882.

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碩士<br>臺灣大學<br>電機工程學研究所<br>95<br>In the field of microlithography the demand for highly integrated electronic circuits has motivated investigation into better lens resolution. Traditional models used in microlithography are based on scalar image formation under the Fresnel approximations. This approximation holds in the low system but it breaks down when the exit pupil diameter is of the same order as the distance from pupil to image (high ), i.e. . We successfully find vector imaging model in a high numerical aperture microlithography system. We survey papers about image modeling, and clear

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Lee, Ming-Hung, and 李明洪. "Design, fabrication and testing ofhigh-numerical-aperture GaN microlens." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/89601886566185509760.

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碩士<br>國立中央大學<br>物理研究所<br>90<br>Abstract Plano-convex diffractive microlenses were fabricated in GaN-based materials with a gray-level mask for the first time. The surface relief of the gray-level diffractive microlens on photoresist was transferred onto GaN by inductively coupled plasma etching technique. The microlenses were characterized with a blue laser diode emitting at 405nm. The focal length of the GaN diffractive microlens is 14.5cm. The potential of the realization of the high-numerical-aperture diffractive microlens in GaN with gray-level mask is discussed.

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Chu, Kuan-Ju. "Image Modeling for a High Numerical Aperture Microlithography System." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2907200707560300.

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Jhang, Jia-Cih, and 張家慈. "Numerical Calculation of Coaxially Dual Aperture Liquid Crystal Lens." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/48805558006017803756.

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碩士<br>國立彰化師範大學<br>光電科技研究所<br>104<br>In this thesis, we proposed a simulation model which successfully demonstrates the experimental results of coaxially dual aperture liquid crystal (LC) lens. Coaxially dual aperture LC lens has been known to improve the depth of field and to realize the switchable field of view of the optical system. In order to understand the physical mechanism, we proposed a charge density model and introduced a correction factor  to simulate the coaxially dual aperture LC lens. The proposed model and obtained results were similar to experimental results. On the other hand

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Tang, Shih-Huan, and 湯士桓. "High Numerical Aperture Microlens Fabrication by Using the Microlens Mask." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/06545912565505406772.

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碩士<br>國立中興大學<br>精密工程學系所<br>105<br>This research presents a novel method for the high numerical aperture microlens fabrication using the microlens mask to improve optical imaging and fabrication technology. The research is divided into three parts. First, the light intensity distribution can be simulated by optical simulation software-TracePro and obtained the numerical analysis for finding an optimal parameter value. Second part is the microlens mask fabrication. The photoresist (AZ-4620) column array was fabricated by lithography and followed by the thermal reflow to form the microlens array

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He, Gung-Jing, and 何恭境. "Numerical analysis of surface plasmon effects on metal nanocavity and aperture." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/44054882438185199694.

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碩士<br>健行科技大學<br>電子工程系碩士班<br>103<br>This thesis is divided into two topics: In topic 1, we numerically investigate the surface plasmon resonance (SPR) modes in periodic silver-shell nanopearl and its dimer arrays with the core relative permittivities filled inside the dielectric holes (DHs) using finite element method (FEM) with three-dimensional calculations. Numerical results of resonant wavelengths corresponding to the effects of different period of unit cells, radii of DHs, illumination wavelengths and the DH core relative permittivity of silver-shell nanopearls are reported as well. Simula

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CHUANG, CHING MIN, and 莊清閔. "Improved Lithography Resolution by Varying I-LINE Optical Lithography Numerical Aperture." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41063964861734146495.

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碩士<br>長庚大學<br>電子工程學系<br>100<br>DRAM (Dynamic Random-Access Memory) is required for larger and larger capacity memory chips with the progress of technology. The IC (Integrated Circuit) manufacturers certainly want to make a largest memory capacity with small wafer size. All they have to do is reducing cost by decreasing the feature size for reaching the requirement of advanced DRAM in next generation. In this study, a process step of via hole was researched. The maximum resolution of window target is 335 nm (CD PATTEM) by KrF (248 nm). However, I-Line wavelength is 365 nm, still can not reach t

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Chen, Yen-Ching, and 陳延慶. "Numerical stuides on build-up of self-staring KLM lasers without aperture." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/27337254491547676520.

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碩士<br>國立交通大學<br>光電(科學)研究所<br>83<br>In this thesis, we have established a numerical model of kerr lens mode-locking(KLM) Ti:sapphire laser cavity by ABCD matrix. In this model, we can simultaneously consider the spatial and temporal effects including self-focusing, gain guiding, free space propagation, group velocity dispersion (GVD), bandwidth limiting, near resonance phase shift, nonlinear absorption and self-phase modulation (SPM). At first, We obtained a solution of a stable cavity,

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Chen, Hsin-Jung, and 陳信榮. "Numerical Analysis and Application of Electromagnetic Shielding of Aperture Effect of Metal Shield." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/93733555272837260574.

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Bairos, Kenley. "Insights from use of a 3-D Discrete-Fracture Network Numerical Model for Hydraulic Test Analysis." Thesis, 2012. http://hdl.handle.net/10214/3673.

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Transmissivity (T) and Hydraulic apertures are often calculated from hydraulic test data obtained in fractured rock using analytical solutions such as the Thiem and cubic law equations developed for flow through unconsolidated porous media. These analytical solutions use a variety of simplifying assumptions, which are often violated due to the complex nature of flow through fractured rock systems which introduces error into the calculated hydraulic apertures. A 3-D discrete fracture network numerical model (SMOKER) for flow in dual-permeability media was used to simulate constant-head strad

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Petchsingto, Tawatchai Karpyn Zuleima Tharays. "Numerical study of fracture aperture characteristics and their impact on single-phase flow and capillary-dominated displacement." 2008. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2520/index.html.

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Lee, Jooyoung. "Development of an automated system for the measurement of focal ratio degradation of high numerical aperture fibres." Thesis, 2019. http://hdl.handle.net/1828/11024.

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The thesis presents the development and testing of an automated fibre optic test system for the measurement of focal ratio degradation (FRD) in high numerical aperture fibres. In particular, the fibres under examination are being proposed for use in the Maunakea Spectroscopic Explorer (MSE), a new telescope currently being designed for wide-field surveys of the night sky. A critical subsystem of the MSE is the Fiber Transmission System (FiTS) that connects the focal plane to the telescope’s spectrographs. In preparation for MSE-FiTS, a method of characterizing the focal ratio degradation (FRD)

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Alex-Change and 張凱榮. "A Study on the Effects of Substrate on the Numerical Aperture of Microlens Fabricated by Reflow Process." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/02886860285699736739.

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碩士<br>國立中興大學<br>機械工程學系<br>93<br>This paper first derived the relationship between NA and the height/diameter ratio (h/D) as a dimensionless geometric parameter of lens via thick-lens theory. Geometric characteristics for lens with high NA are analyzed and simulated. Effects of different substrates on the NA of microlens, fabricated by reflow process using photoresist, are also investigated. Geometry of microlens is analyzed based on the contact angle, measured from the photoresist on different substrates with experiments. Micrlens arrays with diamters of 30μm and 40μm are successfully fabricat

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Liu, Sung-Lin, and 劉松林. "Numerical and Experimental Study on applying Synthetic Aperture Focusing Technique to Test Cracks and Defects in Reinforced Concrete." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/17512009468205965826.

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碩士<br>中華大學<br>土木工程學系碩士班<br>102<br>In this paper the capability of the Synthetic Aperture Focusing Technique (SAFT) in detecting and imaging the cracks in plain concrete and the voids in reinforced concrete were studied. This research first utilized the Finite Element models to simulate the response of the stress wave propagation of a plain concrete with horizontal and tilted cracks and of a reinforced concrete with void subjected to impacting forces. The response signals were analyzed with SAFT and the resultant images were presented so that the feasibility of applying this technique on scanni

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"Recent Techniques for Regularization in Partial Differential Equations and Imaging." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.49073.

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abstract: Inverse problems model real world phenomena from data, where the data are often noisy and models contain errors. This leads to instabilities, multiple solution vectors and thus ill-posedness. To solve ill-posed inverse problems, regularization is typically used as a penalty function to induce stability and allow for the incorporation of a priori information about the desired solution. In this thesis, high order regularization techniques are developed for image and function reconstruction from noisy or misleading data. Specifically the incorporation of the Polynomial Annihilation oper

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Chiu, Chin-Lung, and 邱進隆. "Numerical Modeling and Experimental Verification on the Aggregate and Boundary Effects Induced in Defect Scanning with Stress Wave and Synthetic Aperture Focusing Methods." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/15540161206593270804.

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碩士<br>中華大學<br>土木與工程資訊學系碩士班<br>95<br>The application of a nondestructive testing technology to evaluate the defects embedded in concrete structures is proposed in this paper. Based on using transient elastic waves in conjunction of the Synthetic Aperture Focusing method, the defects implied in concrete may be presented with the scanning images. In this study, the propagation of elastic waves was first simulated with the numerical method of Finite Element. The collected response data was then processed with the Synthetic Aperture Focusing method so that the geometric information of the embedded

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Lee, Byungtark. "Numerical Investigation of Fractured Reservoir Response to Injection/Extraction Using a Fully Coupled Displacement Discontinuity Method." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10100.

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In geothermal reservoirs and unconventional gas reservoirs with very low matrix permeability, fractures are the main routes of fluid flow and heat transport, so the fracture permeability change is important. In fact, reservoir development under this circumstance relies on generation and stimulation of a fracture network. This thesis presents numerical simulation of the response of a fractured rock to injection and extraction considering the role of poro-thermoelasticity and joint deformation. Fluid flow and heat transport in the fracture are treated using a finite difference method while the

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