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Dissertations / Theses on the topic 'Array'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Albannay, Mohammed Masoud. "Array of antenna arrays." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/75576/1/Mohammed_Albannay_Thesis.pdf.

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Antenna arrays are groups of antenna elements spaced in a geometrical pattern. By changing the phase excitation of each element, the array is capable of transmitting electromagnetic waves strongly in a chosen direction with little or no radiation in another direction, thus controlling the array's radiation pattern without physically moving any parts. An antenna array of sub-arrays replaces conventional antenna elements with compact circular arrays with potential for improved performance. This thesis expands on the concept by exploring the development, realisation and operation of an array o

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2

Tzanidis, Ioannis. "Ultrawideband Low-Profile Arrays of Tightly Coupled Antenna Elements: Excitation, Termination and Feeding Methods." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316439948.

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3

Alsawaha, Hamad Waled. "Synthesis of Ultra-Wideband Array Antennas." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54553.

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Acquisition of ultra-wideband signals by means of array antennas requires essentially frequency-independent radiation characteristics over the entire bandwidth of the signal in order to avoid distortions. Factors contributing to bandwidth limitation of arrays include array factor, radiation characteristics of the array element, and inter-element mutual coupling. Strictly speaking, distortion-free transmission or reception of ultra-wideband signals can be maintained if the magnitude of the radiated field of the array remains constant while its phase varies linearly with frequency over the bandw

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4

El-Makadema, Ahmed Talal. "Large scale broadband antenna array systems." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/large-scale-broadband-antenna-array-systems(d2586bcf-4d2f-4046-98bf-90860b52565b).html.

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Broadband antenna arrays have become increasingly popular for various imaging applications, such as radio telescopes and radar, where high sensitivity and resolution are required. High sensitivity requires the development of large scale broadband arrays capable of imaging distant sources at many different wavelengths, in addition to overcoming noise and jamming signals. The design of large scale broadband antenna arrays requires large number antennas, increasing the cost and complexity of the overall system. Moreover, noise sources often vary, depending on their wavelengths and angular locatio

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5

Jafri, Ahsan. "Array signal processing based on traditional and sparse arrays." Thesis, University of Sheffield, 2019. http://etheses.whiterose.ac.uk/23072/.

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Array signal processing is based on using an array of sensors to receive the impinging signals. The received data is either spatially filtered to focus the signals from a desired direction or it may be used for estimating a parameter of source signal like direction of arrival (DOA), polarization and source power. Spatial filtering also known as beamforming and DOA estimation are integral parts of array signal processing and this thesis is aimed at solving some key probems related to these two areas. Wideband beamforming holds numerous applications in the bandwidth hungry data traffic of presen

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6

Han, Yi. "Development of nonlinear reconfigurable control of reconfigurable plants using the FPGA technology." Thesis, [S.l. : s.n.], 2008. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1011&context=td_cput.

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7

Manninen, O. (Olli). "Modelling the antenna arrays using MATLAB-application Sensor Array Analyzer." Bachelor's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201705302196.

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In this thesis, the antenna arrays researched and modelled using Sensor Array Analyzer- application (SAA) from MATLAB. The objective is to explore the array modelling capabilities of the SAA application. This thesis shows that SAA is versatile software for modelling the radiation patterns using 2D or 3D plots, but there are couple of missing features. SAA allows user to import the used code to MATLAB for code modification. Data imported from MATLAB to SAA using variables, for example importing dipole, antenna locations for conformal array and complex coefficients for beamforming. Antenna array

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8

Sharma, Akshay. "Place and route techniques for FPGA architecture advancement /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/6108.

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9

Leonard, Cathy Wood. "Optical feeds for phased array antennas." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80079.

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This thesis investigates optical feed methods for phased array antennas. The technical and practical limitations are analyzed and an optimum design is determined. This optimum optical feed is a two-beam interferometric approach which uses acoustooptic phase control. The theory is derived; a computer model is developed; and the limitations are determined. Design modifications are suggested which reduce limitations and greatly extend the range of applications.<br>Master of Science

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10

Takamizawa, Koichiro. "Array antenna synthesis including element and feed coupling." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/76146.

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Precise radiation pattern control for an array antenna requires precise control of array element excitations. One application is that of low side lobe patterns. Classical synthesis methods for the desired pattern may not be realized in practice due to coupling effects. Coupling occurs in two forms: the mutual coupling between array elements and the coupling introduced by the feed networks. Ideally one could account for such coupling within the array architecture during the design process and alter the feed network parameters to adjust for such coupling. Unfortunately, this is a nonlinear probl

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11

Schodorf, Jeffrey Brian. "Array processing techniques for interference suppression in mobile communications systems." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/12971.

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12

Walter, Thomas. "Dental reference array." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-139683.

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13

Liu, Guang. "Photovoltaic array simulators." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25103.

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Two basic types of photovoltaic (PV) array simulator have been designed and tested. The first involves the use of a pilot panel and variable light source. It is implemented with analogue circuits. A stability analysis based on Popov's method is presented for this simulator with resistance-inductance (R-L) loads. In the second, characteristic array curves are stored in the memory of a microprocessor-based simulator. The design of both simulators is based on the transfer function method. By using the computing facility available, a stability study for the Type I simulator and some dynamic simula

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14

Manra, Vikas. "Efficient array-multipliers /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1240704201&sid=4&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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15

Dowlut, Naushad Hussein. "Superresolution array design." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266213.

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16

Wan, Shuang. "Parametric array calibration." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/4902.

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The subject of this thesis is the development of parametric methods for the calibration of array shape errors. Two physical scenarios are considered, the online calibration (self-calibration) using far-field sources and the offline calibration using near-field sources. The maximum likelihood (ML) estimators are employed to estimate the errors. However, the well-known computational complexity in objective function optimization for the ML estimators demands effective and efficient optimization algorithms. A novel space-alternating generalized expectation-maximization (SAGE)-based algorithm is de

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17

Southwell, David Thomas. "Columnar array networks." Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297157.

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18

Wang, Ji-yong 1967. "Hybrid ultrasonic array." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84216.

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19

Pacheco, Shaun, and Shaun Pacheco. "Array Confocal Microscopy." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/623252.

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Confocal microscopes utilize point illumination and pinhole detection to reject out-of-focus light. Because of the point illumination and detection pinhole, confocal microscopes typically utilize point scanning for imaging, which limits the overall acquisition speed. Due to the excellent optical sectioning capabilities of confocal microscopes, they are excellent tools for the study of three-dimensional objects at the microscopic scale. Fluorescence confocal microscopy is especially useful in biomedical imaging due to its high sensitivity and specificity. However, all designs for confocal micro

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20

Willerton, Marc. "Array auto-calibration." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11684.

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In this thesis, efficient methods are presented to calibrate large or small aperture array systems containing different types of uncertainties. specifically the challenge of reducing the number of external sources required to calibrate an array is addressed and array calibration methods suitable for use when sources may be operating in the "near-far" field of the array are developed. Together, this can ease the overheads involved in calibrating and recalibrating an array system. In addition to presenting novel array calibration algorithms, this thesis also presents a novel transformation allow

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21

Efstathopoulos, Georgios. "Extended array manifolds." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/11240.

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22

Amin, H. "Investigations into the hardware implementation of artificial neural networks." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263389.

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23

Eng, Cher Shin. "Digital antenna architectures using commercial off-the-shelf hardware." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FEng.pdf.

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Thesis (M.S. in Engineering Science (Electrical Engineering)--Naval Postgraduate School, December 2003.<br>Thesis advisor(s): David C. Jenn, Roberto Cristi. Includes bibliographical references (p. 75-76). Also available online.

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24

Yasar, Temel Kaya. "Improvements In Doa Estimation By Array Interpolation In Non-uniform Linear Arrays." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607524/index.pdf.

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In this thesis a new approach is proposed for non-uniform linear arrays (NLA) which employs conventional subspace methods to improve the direction of arrival (DOA) estimation performance. Uniform linear arrays (ULA) are composed of evenly spaced sensor elements located on a straight line. ULA&#039<br>s covariance matrix have a Vandermonde matrix structure, which is required by fast subspace DOA estimation algorithms. NLA differ from ULA only by some missing sensor elements. These missing elements cause some gaps in covariance matrix and Vandermonde structure is lost. Therefore fast subspace DO

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25

Akyildiz, Isin. "Drection Of Arrival Estimation By Array Interpolation In Randomly Distributed Sensor Arrays." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607963/index.pdf.

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In this thesis, DOA estimation using array interpolation in randomly distributed sensor arrays is considered. Array interpolation is a technique in which a virtual array is obtained from the real array and the outputs of the virtual array, computed from the real array using a linear transformation, is used for direction of arrival estimation. The idea of array interpolation techniques is to make simplified and computationally less demanding high resolution direction finding methods applicable to the general class of non-structured arrays.In this study,we apply an interpolation technique for a

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26

Sinclair, David Robert. "A study of the square kilometre array low-frequency aperture array." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:7b5047f4-5643-49be-aea8-e31512180267.

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This thesis primarily comprises simulations of SKA1-Low, the low-frequency aperture array of the Square Kilometre Array (SKA) radio telescope. Simulations assess how different design specifications would affect the telescope's performance and ability to undertake one of its key science projects: observing the Epoch of Reionisation (EoR). The simulations are based on the previous baseline design of ~ 260 000 dipole antennas in 1024 stations of 256 antennas each. It is found that errors in the gain and phase of signals at each antenna can significantly affect observations, with the greatest impa

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27

Goshi, Darren S. "Advanced retrodirective array and phased array architectures for wireless communication systems." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1414125501&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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28

Terrell, Stephen John. "Design of a bistatic nearfield array for an expanded volume." Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-03172005-140730/unrestricted/terrell%5Fstephen%5Fj%5F200505%5Fmast.PDF.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2005.<br>Rogers, Peter, Committee Chair ; Ginsberg, Jerry, Committee Member ; Trivett, David, Committee Member. Includes bibliographical references.

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29

Yang, Zhenchao. "High-Efficiency Passive and Active Phased Arrays and Array Feeds for Satellite Communications." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5741.

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Satellite communication (Satcom) services are used worldwide for voice, data, and video links due to various appealing features. Parabolic reflector antennas are typically used to serve a cost effective scheme for commercial applications. However, mount degradation, roof sag, and orbital decay motivate the need for beam steering. Limited scan range beam steering opens a third option for electronic beam steering with lower cost than full aperture phased arrays and higher tracking speed and accuracy than mechanical-only steering.Multiple high efficiency passive patch array feeds were designed, f

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30

Hanson, Timothy B. "Cascade adaptive array structures." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1173207031.

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31

Ng, Kwong-Tai. "Admittance properties of a slot array with parasitic wire arrays in a stratified medium /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487259580262744.

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32

Khan, Asim Ali. "Performance optimisation of small antenna arrays." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/performance-optimisation-of-small-antenna-arrays(759e6929-04ab-408c-aee3-404c72711cdb).html.

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This thesis addresses radiation pattern synthesis problems for small linear periodic phased arrays (with array elements less then 10). Due to the small array size conventional pattern synthesis techniques fail to produce the required results. In the case of practical small arrays, mutual coupling and element pattern asymmetric effect degrade the array radiation performance. The main performance metrics considered in this thesis include side lobe level (SLL), gain, halfpower beamwidth (HPBW) and mainbeam scan direction. The conventional pattern synthesis approaches result in sub optimal gain, S

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33

Malik, Usama Computer Science &amp Engineering Faculty of Engineering UNSW. "Configuration encoding techniques for fast FPGA reconfiguration." Awarded by:University of New South Wales. School of Computer Science and Engineering, 2006. http://handle.unsw.edu.au/1959.4/26212.

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This thesis examines the problem of reducing reconfiguration time of an island-style FPGA at its configuration memory level. The approach followed is to examine configuration encoding techniques in order to reduce the size of the bitstream that must be loaded onto the device to perform a reconfiguration. A detailed analysis of a set of benchmark circuits on various island-style FPGAs shows that a typical circuit randomly changes a small number of bits in the {\it null} or default configuration state of the device. This feature is exploited by developing efficient encoding schemes for configur

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34

Koh, Shannon Computer Science &amp Engineering Faculty of Engineering UNSW. "Generating the communication infrastracture for module-based dynamic reconfiguration of FPGas." Publisher:University of New South Wales. Computer Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/41418.

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Current approaches to supporting module-based FPGA reconfiguration focus on various aspects and sub-problems in the area but do not combine to form a coherent, top-down methodology that factors low-level device parameters into every step of the design flow. This thesis proposes such a top-down methodology from application specification to low-level implementation, centered around examining the problem of generating a point-to-point communications infrastructure to support the changing interfaces of dynamically placed modules. Low-level implementation parameters are considered at every stage to

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35

Wood, Christopher Landon. "Runtime partial FPGA reconfiguration." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15051.

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36

Galindo, Juan Manuel. "A novel partial reconfiguration methodology for FPGAs of multichip systems /." Online version of thesis, 2008. http://hdl.handle.net/1850/7784.

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37

Rajagopalan, Kamal. "An FPGA architecture for improved arithmetic performance /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16460.pdf.

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38

Khan, Iqtidar Ahmad. "Analysis and Synthesis of a New Class of Low Side Lobe Planar Arrays." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/93222.

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Numerical techniques for designing planar arrays with low side lobe level often require memory intensive optimization algorithms and also initialization in the form of some known values of radiation pattern parameters beforehand - information that may not be available when designing arrays. A few analytical methods exist in the literature that can be used to design rectangular lattices of isotropic elements for desired half-power beamwidth and side lobe level, but the number of elements of the array often should be known before the design process. Some array designs based on analytical techniq

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39

Dalevi, Mathias. "S-Band Antenna Array." Thesis, Uppsala University, Astronomy and Space Physics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-126302.

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<p><strong>This report presents concepts for a planar active electronically scanned antenna(AESA). The goal of the project was to devlop a low-weight, low profile, thin, S-band antenna with wide-scan angle capabilities. In the final concept the service aspects of the T/R-modules was also taken into acount in order to allow easy and fast replacements of these components. The antenna was designed and optimised using the commercial software Ansoft HFSS. A prototype of the antenna was constructed and later measured and verified. The final concept is a 2m×2m antenna with an estimated weight of arou

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40

Otsuka, Takuma. "Bayesian Microphone Array Processing." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188871.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(情報学)<br>甲第18412号<br>情博第527号<br>新制||情||93(附属図書館)<br>31270<br>京都大学大学院情報学研究科知能情報学専攻<br>(主査)教授奥乃博, 教授河原達也, 准教授 CUTURI CAMETO Marco, 講師吉井和佳<br>学位規則第4条第1項該当

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41

More, Daesha. "Microhotplate Sensor Array Fabrication." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/MoreD2007.pdf.

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42

Mony, Madeleine. "Reprogrammable optical phase array." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103276.

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The evolving needs of network carriers are changing the design of optical networks. In order to reduce cost, latency, and power consumption, electrical switches are being replaced with optical switching fabrics at the core of the networks. An example of such a network is an Agile All-Photonic Network (AAPN).<br>This thesis presents a novel device that was designed to operate as an optical switch within the context of an AAPN network. The device is a Reprogrammable Optical Phase Array (ROPA), and the design consists of applying multiple electric fields of different magnitudes across an electro-

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43

Alexiou, Angeliki. "Bounds in array processing." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249378.

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44

Aytun, Alper. "Frequency diverse array radar." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/5113.

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Approved for public release; distribution is unlimited<br>Electronic scanning is the most desirable feature of state-of-the-art radar systems. With electronic scanning, it is possible to steer the main beam of an array antenna instantaneously into a desired direction where no mechanical mechanism is involved in the scanning process. Electronic scanning methods including phase scanning, time delay scanning, and frequency scanning have been used in various radar applications; however new and cheaper scanning methods are still being investigated. It is the purpose of this thesis to investigate an

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45

Li, Yan 1978 July 15. "Gene expression array simulator." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87263.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, June 2002.<br>"May 10, 2002.<br>Includes bibliographical references (leaf 141).<br>by Yan Li.<br>M.Eng.

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46

Fofonoff, Timothy Andrew 1977. "Brain microelectrode array systems." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/41031.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.<br>Includes bibliographical references (leaves 110-114).<br>New methods for manufacturing microelectrode array assemblies, passive devices designed for intracortically recording brain activity in nonhuman primates, were developed and explored. Wire electrical discharge machining (EDM), chemical etching, micromilling, parylene deposition, and laser ablation were some of the processes employed to create distinctive microstructures with fine features and high aspect ratios. These microstructures, construc

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Rusholme, Benjamin Alan. "The very small array." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621310.

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Schluntz, Justine Oakley. "Tidal turbine array modelling." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:b342fda1-a311-4783-8249-9b1515e0ad62.

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Computational fluid dynamics (CFD) is used in this thesis to model wind and tidal stream turbines and to investigate tidal turbine fence performance. There are two primary objectives of this work. The first is to develop and validate an actuator line method for the simulation of wind and tidal turbines which applies the blade forces to the flow field without the need for a regularisation kernel. The second is to examine tidal fences using, in part, the newly developed actuator line method. A potential flow equivalence method for determining the relative velocity to the blade chord and flow ang

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49

Lin, Yuanzhi. "Active Antenna Oscillator Array." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1231873914.

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50

Smith, Edward J. "The diode array velocimeter." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040337/.

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