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Dissertations / Theses on the topic 'NEAR FIELD REGION'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

BRANDAO, MARCELO LYRA. "EFFECTS OF OBSTACLES IN THE NEAR-FIELD REGION OF CASSEGRAIN ANTENNAS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1985. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14269@1.

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A presente tese estudará as modificações introduzidas nos diagramas de radiação de antenas cassegrain, em decorrência da colocação de obstáculos, como cercas, na região de campos próximos. A análise destas modificações será baseada na Teoria Geométrica da Difração. Definida a geometria do problema, serão desenvolvidos algoritmos para determinação dos pontos de reflexão e difração e, a partir destes pontos, calculados os campos espalhados. A eficiência de diversas configurações de obstáculos, na redução dos campos irradiados em certas direções, será analisada.<br>This work will study the modif
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2

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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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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4

Jayasooriya, Jayasooriya Hevavitharanage Aruna Ruwan. "Vulnerability and damage analysis of reinforced concrete framed buildings subjected to near field blast events." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/67925/1/Ruwan_Jayasooriya_Thesis.pdf.

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Terrorists usually target high occupancy iconic and public buildings using vehicle borne incendiary devices in order to claim a maximum number of lives and cause extensive damage to public property. While initial casualties are due to direct shock by the explosion, collapse of structural elements may extensively increase the total figure. Most of these buildings have been or are built without consideration of their vulnerability to such events. Therefore, the vulnerability and residual capacity assessment of buildings to deliberately exploded bombs is important to provide mitigation strategies
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5

Beran, Vlastimil. "Blízké pole dipólových antén." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218321.

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The thesis describes the radiation of dipole antennas in near field area. More methods for evaluation of spatial dipole field arrangement are compared. The work target for practical use is to create software for simulation of near field values placed in planar or cylindrical observation plane. The computer programme is applicable to single dipole or dipole array. The limits for human body exposition of non-ionizing radiation are here implemented for compliance purpose in hygienic evaluations. The simulated results of field distribution are possible to display as graphs or save to data file. Th
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6

Szewc, Carola. "Molecule interference in the near-field Talbot regime." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/343753/.

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We show our progress in setting up a three grating near-field Talbot-Lau interferometer (TLI) for large molecules such as C60. The TLI is the preferred tool for showing the wave nature of large particles, as it accepts beams of poor spatial coherence and because of its scaling properties with increasing mass of the particles. The spatial coherence is prepared by the first grating, it can be seen as an array of many collimation slits. Our setup is highly flexible in terms of the possibility of changing most of the parameters (such as distances between the gratings and grating angles) from the o
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7

Soderi, S. (Simone). "Evaluation of industrial wireless communications systems’ security." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212463.

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Abstract The worldwide success of wireless communications was originally fueled by the possibility to replace existing cables with wireless solutions. This phenomenon imposed the development of security engineering as a multidisciplinary field. Although wireless solutions can reduce installation costs and allow introducing new services, the end–users expect it to have the same level of security as they would normally have with wired solutions. Secure communications is an important part of the overall security of industrial wireless communications systems (IWCS). The aim of this thesis is to de
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8

Шабашов, Е. П., та E. P. Shabashov. "Моделирование и анализ свойств антенны-аппликатора для исследования излучения головного мозга в микроволновом диапазоне : магистерская диссертация". Master's thesis, б. и, 2020. http://hdl.handle.net/10995/94637.

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Исследовано поглощение мощности электромагнитного поля тканями головы человека в микроволновом диапазоне. Расчет электрического поля в тканях головы, индуцированного элементарной антенной, основано на применении функций Грина слоистых сред. Два вида излучателей, таких как полуволновый диполь и петлевая антенна сравниваются с точки зрения глубины проникновения электромагнитной энергии. Рассчитана мощность, поглощаемая в различных слоях модели головы человека. В заключении сделан вывод о преимуществе применения криволинейных токов, таких, как формируемых плоской спиралью. Рассмотрено влияние про
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9

Ramasubramanian, Chandrasekar. "Characterization of Near Field Spray for Impinging Doublets in Air Under High Pressure." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397233377.

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10

Li, Shi-Ming. "Mean-Field Free-Energy Lattice Boltzmann Method for Liquid-Vapor Interfacial Flows." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29621.

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This dissertation includes a theoretical and numerical development to simulate liquid-vapor flows and the applications to microchannels. First, we obtain a consistent non-local pressure equation for simulating liquid-vapor interfacial flows using mean-field free-energy theory. This new pressure equation is shown to be the general form of the classical van der Waals" square-gradient theory. The new equation is implemented in two-dimensional (2D) D2Q7, D2Q9, and three-dimensional (3D) D3Q19 lattice Boltzmann method (LBM). The three LBM models are validated successfully in a number of analytica
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11

Kuschewski, Frederik [Verfasser], Lukas M. [Gutachter] Eng, and Hartmut [Gutachter] Roskos. "Investigation of nanometer scale charge carrier density variations with scattering-type scanning near-field microscopy in the THz regime / Frederik Kuschewski ; Gutachter: Lukas M. Eng, Hartmut Roskos." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227196806/34.

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12

Stockmar, Marco Kurt Verfasser], Franz [Akademischer Betreuer] Pfeiffer, Pierre [Akademischer Betreuer] Thibault, and Reinhard [Akademischer Betreuer] [Kienberger. "Ptychographic phase retrieval for the near-field regime with applications in x-ray nano-tomography / Marco Kurt Stockmar. Betreuer: Franz Pfeiffer. Gutachter: Pierre Thibault ; Reinhard Kienberger ; Franz Pfeiffer." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1095766244/34.

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13

Qiu, Huan Ke, and 邱煥科. "Magnetic-field shielding characteristics in the near-field region." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/17352433038076103793.

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14

Liu, Xiao active 21st century. "Computation of near-field distribution around wind turbines." Thesis, 2014. http://hdl.handle.net/2152/26004.

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In this work, two approaches for computing the near-field distribution around wind turbines are proposed, including: (1) Huygens Principle and (2) the parabolic equation technique. In order to simplify the problem, the cylinder model is utilized to represent the wind turbines and transform the problem into a two-dimensional case. To make Huygens Principle computationally tractable, several approximations are made based on the problem geometry especially modelling the cylinder as a plate. The expression of the electromagnetic field radiated by the equivalent magnetic current can be analytically
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15

LIN, DING-BING, and 林丁丙. "Microwave diversity imaging of perfectly conducting objects in the close near-field region." Thesis, 1989. http://ndltd.ncl.edu.tw/handle/45278050043014826749.

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16

Yoon, Ick-Jae. "Realizing efficient wireless power transfer in the near-field region using electrically small antennas." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-6167.

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Non-radiative wireless power transfer using the coupled mode resonance phenomenon has been widely reported in the literature. However, the distance over which such phenomenon exists is very short when measured in terms of wavelength. In this dissertation, how efficient wireless power transfer can be realized in the radiating near-field region beyond the coupled mode resonance region is investigated. First, electrically small folded cylindrical helix (FCH) dipole antennas are designed to achieve efficient near-field power transfer. Measurements show that a 40% power transfer efficiency (PTE) c
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17

Yang, Ping-Hsueh, and 楊秉學. "Two-dimensional Quasi-monostatic Millimeter-wave Imaging of Metallic Object in the Near-field Region." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/81054544862811448115.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>103<br>This thesis is based-on the microwave holography to develop a millimeter-wave imaging system. In this study a metallic object is illuminated by a millimeter-wave at 65 GHz, the object scattered field including amplitude and phase is recorded in a quasi-monostatic two-dimensional near-field backscattering arrangement. The millimeter-wave image of scattering object is reconstructed through an image reconstruction algorithm. In the analysis, the scattering metallic object is illuminated by a spherical wave, under physical optics approximation, its scattered fie
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18

Riese, Michael. "Study of large-scale coherent structures in the near field and transition regions of a mechanically oscillated planar jet." 2009. http://hdl.handle.net/2440/54150.

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Enhancing the performance of mixing and fluid entrainment by excitation of quasi-steady jets has been a subject of research for more than three decades. During the 1980s a special emphasis was placed on mechanically oscillating planar jets and the possibility to augment thrust of V/STOL aircraft. However, during this time, little attention was paid to the classification of flow regimes, the development of coherent structures or the existence of different regions in the flow within the jet near field. For the present study, a large aspect ratio nozzle was oscillated in the direction transverse
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19

Kuschewski, Frederik. "Investigation of nanometer scale charge carrier density variations with scattering-type scanning near-field microscopy in the THz regime." 2019. https://tud.qucosa.de/id/qucosa%3A38078.

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Near-field microscopy is a versatile technique for non-destructive detection of optical properties on the nanometer scale. Contrary to conventional microscopy techniques, the resolution in near-field microscopy is not restricted by the diffraction limit, but by the size of the probe only. Typically, wavelength-independent resolution in the range of few ten nanometers can be achieved. Many fundamental phenomena in solid states occur at such small length scales and can be probed by infrared and THz radiation. In the present work, nanoscale charge carrier distributions were investigated with near
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