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Dissertations / Theses on the topic 'Overlayer'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Roudgar, Ataollah. "Local reactivity of bimetallic overlayer and cluster systems." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971640084.

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2

Barnes, Robert David Frazer. "Diffraction gratings as a platform for overlayer detection and representation." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319553.

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3

Clarke, A. "A wavevector imaging photoelectron spectrometer, with application to a magnetic overlayer system." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233729.

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The work presented in this thesis may be considered in two main parts; firstly a description of the design and operation of a display type photoelectron spectrometer. Secondly a series of experiments investigating the electronic properties of thin epitaxial films (1-5 atomic layers) of cobalt grown on a clean single crystal copper (001) substrate. Conventional angle resolved photoelectron spectrometers of the deflection type are only capable of observing one point in the (E,θ,φ) space at a time. This is often perfectly acceptable if one is concerned with optimal resolution in order to perform

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4

Anton, Alan Brad Weinberg Henry. "Studies of overlayer vibrational structure and identification of adsorbed reaction intermediates via electron energy loss spectroscopy /." Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-04032008-110807.

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5

MORANDI, SARA. "NEW APPROACHES FOR THE DESIGN, SCREENING AND CHARACTERIZATION OF INNOVATIVE SEMICONDUCTOR/OVERLAYER ARCHITECTURES FOR PHOTO-DRIVEN WATER ELECTROLYSIS." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/484308.

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New approaches for the design, screening and characterization of innovative semiconductor/overlayer architectures for photo-driven water electrolysis The optimization of environmental protection and remediation and the better exploitation of renewable power sources undoubtedly represent the key issues to lead to the sustainable development of civil and industrial activities. In this context, hydrogen and electricity can be considered as the most promising and as the most adopted energy vector, respectively. The possibility of adopting the former depends on the availability of suitable devic

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6

Andreussi, Oliviero. "Water at Interfaces." Doctoral thesis, Scuola Normale Superiore, 2008. http://hdl.handle.net/11384/85793.

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7

Law, Yeuk Ting. "Investigation of reaction networks and active sites in ethanol steam reforming reaction over Ni and Co-based catalysts." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00869963.

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Bimetallic catalysts have been widely exploited to improve the performance of various catalytic reactions. Understanding the surface properties and in particular, bimetallic interaction and support effect of the catalytic components is an important step towards rational catalyst design. In this thesis, Ni-Co thin film on polar ZnO single crystal was studied as a model catalyst for ethanol steam reforming reaction. The aim is to provide fundamental understanding of how the surface characteristics of the catalyst influence the mechanism and the efficiency of the reaction. This study focused firs

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8

ACHILLI, SIMONA. "Spectral properties of adsorbates on metal surfaces via the embedding method." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/10827.

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Adsorbates on metal surfaces have attracted recently the scientific interest both from a fundamental point of view (quantum confinement) and in perspective of application in technology. In particular the electronic properties of such reduced symmetry systems are strictly related to their low dimensionality. An accurate theoretical description of their spectral properties has necessarily to deal with the absence of periodicity that characterizes these systems in one (thin films) or more (adatoms) directions. The embedding method allows to overcome this drawback considering a really infinite sys

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Gerth, Christopher Marc. "Infrared absorption studies of two different types of self-assembled monolayers : alkanethiols deposited from aqueous solution and surface confined polymerization of polymethyl-methacrylate (PMMA) using metal overlayer attenuated total reflectance (ATR) and single bounce germanium attenuated total reflectance (GATR) spectroscopies /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

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10

Amft, Tobias Verfasser], Kálmán [Gutachter] Graffi, and Martin [Gutachter] [Mauve. "The Impact of Resource Sharing on Coexisting P2P Overlays and Stacked Overlay Modules / Tobias Amft ; Gutachter: Kalman Graffi, Martin Mauve." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/1148066845/34.

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Amft, Tobias [Verfasser], Kálmán Gutachter] Graffi, and Martin [Gutachter] [Mauve. "The Impact of Resource Sharing on Coexisting P2P Overlays and Stacked Overlay Modules / Tobias Amft ; Gutachter: Kalman Graffi, Martin Mauve." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/1148066845/34.

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12

Wearing, Lisa. "Formnation of metallic overlayers on quasicrystalsurfaces." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502247.

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The main aim of this study is to explore the fundamentals of aperiodicity through the deposition of a single elemental aperiodic overlayer onto a quasicrystal surface. The main difficulty with understanding the effects of aperiodicity on the quasicrystal structure arises due to the chemical complexity associated with the surface, as such structures are only observed in metallic alloys containing two or more elements. The formation of a single element quasicrystalline structure has been achieved through the deposition of Pb on i-AI-Pd-Mn and d-AI-Ni-Co (results of the latter not included). This

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13

Capano, Michael Anthony. "X-ray studies of strained overlayers." Thesis, Massachusetts Institute of Technology, 1989. https://hdl.handle.net/1721.1/130223.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1989.<br>Includes bibliographical references (leaves 184-188).<br>by Michael A. Capano.<br>Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1989.

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14

Robertson, Robert Scott. "Trusted Mobile Overlays." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2425.

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Sensitive information is increasingly moving online and as data moves further from the control of its owner, there are increased opportunities for it to fall into malicious hands. The Web is comprised of three untrusted components where there is a risk of information compromise: networks, service providers, and clients. This thesis presents Trusted Mobile Overlays: a system that leverages trusted mobile devices to protect users from these untrusted components of the Web, while minimizing deployment difficulties. It presents a high-level design of the system as well as a prototype that implemen

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15

Kronstrand, Alexander, and Andreas Holmqvist. "Overlay Network." Thesis, Linköpings universitet, Informationskodning, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119498.

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Nowadays, optical fiber is widely used in several areas, especially in communication networking. The main reason is that optical fiber has low attenuation and high bandwidth. However, the switching functionality is performed in the electrical domain (inside the router), thus we have transmission delays in the network lanes. In this study we explore the possibility of developing a hardware “plug-in” that can be connected in parallel with routers of the network enabling the router with “plug-in” to let it bypass time-critical traffic. We researched different switching techniques for optical fibe

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Myers, Colin Stephen. "Navigating networks using overlays." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/5055/.

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This thesis contributes a novel approach to navigation tasks in large graphs. Graph visualization is the problem of representing the structure of a mathematical graph G = (V,E), V a set of vertices (or nodes) and E ⊆V ×V a set of edges. My work is concerned with the node-link representation of graphs and I use the term network to distinguish this external representation from the underlying mathematical structure. Networks are an intuitive representation of a set of elements and the relationships between them, and are known to be effective for analysis tasks involving following paths between no

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17

Andersen, David G. (David Godbe) 1975. "Resilient overlay networks." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86657.

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18

Fraiwan, Mohammad Amin. "Overlay networks monitoring." [Ames, Iowa : Iowa State University], 2008.

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Yiu, Wai-Pun. "Secure overlay multicast /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?COMP%202004%20YIU.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.<br>Includes bibliographical references (leaves 71-77). Also available in electronic version. Access restricted to campus users.

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20

Jemander, Thorbjörn. "STM studies of overlayers on semiconductor or insulator surfaces /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek686s.pdf.

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21

Poulston, Stephen. "Structure and properties of metallic overlayers on Ru(100)." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338256.

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22

Sanders, Paul John. "Reinforced asphalt overlays for pavements." Thesis, University of Nottingham, 2001. http://eprints.nottingham.ac.uk/12221/.

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The maintenance of road pavements in England has become a costly necessity, due largely to the large volume of commercial vehicles using the roads which cause pavements to deteriorate quickly, and makes their repair more difficult to carry out. These roadworks incur not only direct works costs, but also indirect costs from factors such as congestion, motor accidents and pollution. There is obviously a need for cost-effective maintenance that minimises the occurrence and duration of these disruptions. To strengthen pavements bituminous overlays are often used, but may crack prematurely when pla

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23

Latif, L. "Node selection in distributed overlays." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1389944/.

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With the proliferation of latency aware services such as live video streaming, Internetbased financial trading and the popularity of distributed overlays such as BitTorrent there is a growing need for latency-aware distributed overlays. To make such overlays viable, efficient resource discovery services are needed. Anycast is a routing protocol that sends packets to nodes that are a member of a particular group, with the work presented the Anycast protocol in the distributed overlay domain. Structured and unstructured distributed networks have become a popular way to disseminate data without t

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Fonseca, Pedro. "Search Strategies in Unstructured Overlays." Master's thesis, Department of Informatics, University of Lisbon, 2008. http://hdl.handle.net/10451/13892.

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Unstructured peer-to-peer networks have a low maintenance cost, high resilience and tolerance to the continuous arrival and departure of nodes. In these networks search is usually performed by flooding, which generates a high number of duplicate messages. To improve scalability, unstructured overlays evolved to a two-tiered architecture where regular nodes rely on special nodes to locate resources, called supernodes or superpeers, thus reducing the scope of flooding based searches. While this approach takes advantage of node heterogeneity, it makes the overlay less resilient to accidental and

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Qazi, Sameer Hashmat Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Scalable resilient overlay networks." Awarded By:University of New South Wales. Electrical Engineering & Telecommunications, 2009. http://handle.unsw.edu.au/1959.4/44536.

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The Internet has scaled massively over the past 15 years to extend to billions of users. These users increasingly require extensive applications and capabilities from the Internet, such as Quality of Service (QoS) optimized paths between end hosts. When default Internet paths may not meet their requirements adequately, there is a need to facilitate the discovery of such QoS optimized paths. Fortunately, even though the route offered by the Internet may not work (to the required level of performance), often there exist alternate routes that do work. When the direct Internet path between two In

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Srivastava, Manoj. "SECURITY OVERLAY FOR RMI." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011106-220340.

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<p>Distributed object computing refers to allowing objects to be distributed across a network. These objects may be distributed across a number of different computers and across networks.This thesis presents a popular distributed object architecture, Remote Method Invocation (RMI). As RMI works on a Java framework, it provides the same features Java provides. Its portability, ability to transport objects as a whole, and power to connect to existing as well as legacy systems makes a strong choice amongst other competing technologies. Needless to say, the transport of objects across systems brin

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27

Berns, Andrew David. "Self-stabilizing overlay networks." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/3431.

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Today's distributed systems exist on a scale that was unimaginable only a few decades ago. Distributed systems now can consist of thousands or even millions of computers spread across the entire world. These large systems are often organized into overlay networks - networks composed of virtual links, with each virtual link realized by one or more physical links. Self-stabilizing overlay networks promise that, starting from any weakly-connected configuration, the correct network topology is always built. This area of research is young, and prior examples of self-stabilizing overlay networks hav

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Ng, May Ling. "Characterization and Functionalization of 2D Overlayers Adsorbed on Transition Metals." Doctoral thesis, Uppsala universitet, Yt- och gränsskiktsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-130342.

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Two-dimensional layered materials, namely monolayer hexagonal boron nitride and graphene were grown by CVD on various transition metals. The physical and chemical properties of these systems were characterized systematically using synchrotron-based spectroscopic techniques, scanning tunneling microscopy and low energy electron diffraction. It is learned that the overlayer–substrate interaction is caused by the overlayer π–substrate d band hybridization. The physical properties of these overlayers depend on the strength of interaction and the degree of lattice matching at the interface. The str

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29

Nicklin, Christopher L. "Electronic and structural properties of ultra-thin rare earth overlayers." Thesis, University of Leicester, 1993. http://hdl.handle.net/2381/35750.

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Photoelectron spectroscopy, low energy electron diffraction (LEED), Auger electron spectroscopy (AES), secondary electron emission crystal current (SEECC) and work function change measurements have been used to correlate the electronic and geometric structures of well characterised overlayers of Tm and Gd on Mo(110) and Ag(001). Tm deposited on Mo(110) is shown to form two ordered structures with (10x2) and c(8x4) symmetry before a hexagonal monolayer is formed. Mixed valence, caused by low co-ordinated adatoms, has been observed for sub-monolayer coverages of this system at room temperature.

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Murukesvan, Abhinash. "Distributed Overlays in Wireless Sensor Networks." Thesis, KTH, Kommunikationssystem, CoS, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92202.

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This thesis investigates two architectures and compares their suitability for selective application and user differentiation in sensor networks. A hierarchical architecture consisting of more capable cluster heads surrounded by weaker nodes is compared to a flat architecture of equally powerful nodes. In both architectures there exists a logical overlay network that connects the nodes, depending on the application and user. Furthermore, a broadcast encryption scheme is proposed to aid in distributing keys to nodes for secure communication and to maintain these restricted groups.<br>applikation

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31

Masuku, Crispen. "Tensile relaxation of bonded concrete overlays." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/12109.

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Includes abstract.<br>Includes bibliographical references (leaves 131-135).<br>Restrained shrinkage in bonded concrete overlays can cause stress build up, cracking and even debonding. Tensile relaxation is the main mechanism of stress relief in concrete overlays. This results in less possibility of cracking and debonding. The research described in this study presents an analytical method of analysis. This method is based on tests performed to assess tensile relaxation in concretes subjected to restraint. Although this study is limited in scope, it serves as an introduction to the topic and con

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Gustafsson, Maria. "Läshastighet på datorskärm med färgade overlays." Thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-65546.

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Syfte: Att undersöka läshastigheten på datorskärm och om den kan förbättras med hjälp av färgade overlays, samt om det finns någon skillnad i läshastighet på utskrivet papper och datorskärm. Metod: Deltagarna (n=30) fick läsa ett Wilkins rate of reading test översatt till svenska, där antalet ord som hann läsas upp högt under en minut jämfördes då de läste på papper utan overlay och på datorskärm med och utan overlay. Studien gjordes på studenter mellan 18-31 år. Resultat: Den här studien visar att det inte finns någon signifikant skillnad i läshastighet mellan läsning på utskrivet papper och

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33

Sun, Zhenhua. "Evaluation of concrete bridge deck overlays." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3630.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains xiii, 101 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 97-101).

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Wagh, Prasad J. "DiffServ overlay multicast for videoconferencing." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4301.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (January 10 , 2007) Includes bibliographical references.

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35

Wu, Xiao. "SIP on an Overlay Network." Thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91491.

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With the development of mobile (specifically: wide area cellular telephony) technology, users’ requirements have changed from the basic voice service based on circuit switch technology to a desire for high speed packet based data transmission services. Voice over IP (VoIP), a packet based service, is gaining increasing attention due to its high performance and low cost. However, VoIP does not work well in every situation. Today Network address translation (NAT) traversal has become the main obstruction for future VoIP deployment. In this thesis we analyze and compare the existing NAT traversal

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Junkert, Levi Daniel. "The grid overlay system model." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/junkert/JunkertL0509.pdf.

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The grid overlay system model is a new technique for forming a grid computing model for research computing. In this method we construct a grid that is dynamically allocated from a set of resources in a unique and progressive manner. This new system model allows for construction of virtual environments for execution of applications on many diverse shared resources. The system can dynamically scale to create a range of resources from a single machine to a virtual cluster of machines. This model provides a virtual container that can run legacy and customized software in an emulated environment or

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Tam, W. S. "Pavement evaluation and overlay design." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378746.

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Rashid, Lezan. "Overlay welding of FeCrAl alloys." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-44345.

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In this master thesis different overlay welding methods suitable for boiler application has been investigated. The purpose of this project is to define advantages and disadvantages for each overlay welding methods and suggest some evaluation criteria on some commercial and experimental alloys aimed for overlay welding material. Many components in a boiler are made of low alloy steel and the atmosphere in the furnace region can be very complex; therefore many different types of corrosion can occur. Weld overlay is a process where one or multiple layers of corrosion resistant material are applie

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Miao, Jun. "Load balance in overlay multicast /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?COMP%202004%20MIAO.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.<br>Includes bibliographical references (leaves 59-62). Also available in electronic version. Access restricted to campus users.

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Payberah, Amir H. "Distributed Optimization of P2P Media Delivery Overlays." Licentiate thesis, KTH, Programvaru- och datorsystem, SCS, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33287.

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Media streaming over the Internet is becoming increasingly popular. Currently, most media is delivered using global content-delivery networks, providing a scalable and robust client-server model. However, content delivery infrastructures are expensive. One approach to reduce the cost of media delivery is to use peer-to-peer (P2P) overlay networks, where nodes share responsibility for delivering the media to one another. The main challenges in P2P media streaming using overlay networks include: (i) nodes should receive the stream with respect to certain timing constraints, (ii) the overlay shou

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Khelghatdoust, Mansour. "Gossip based peer sampling in social overlays." Thesis, KTH, Kommunikationsnät, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144278.

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Performance of many P2P systems depends on the ability to construct a ran- dom overlay network among the nodes. Current state-of-the-art techniques for constructing random overlays have an implicit requirement that any two nodes in the system should always be able to communicate and establish a link be- tween them. However, this is not the case in some of the environments where distributed systems are required to be deployed, e.g, Decentralized Online So- cial Networks, Wireless networks, or networks with limited connectivity because of NATs/firewalls, etc. In such restricted networks, ev

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Libarikian, Ari Levon 1978. "Robustness of bus overlays in optical networks." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16850.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.<br>Includes bibliographical references (p. 53-56).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Local area networks (LANs) nowadays use optical fiber as the medium of communication. This fiber is used to connect a collection of electro-optic nodes which form network clouds. A network cloud is a distribution network that connects several external nodes to the backbone, and oft

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Bamforth, Miren. "Electrical design of structurally tunable skin overlays." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119543.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 94-98).<br>Current on-skin interfaces focus on enabling electronic circuitry and display-like output on top of the skin, but to the best of our knowledge interfaces for tuning the texture or stiffness of the skin itself are

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Stevens, Robert James. "Polyester Polymer Concrete for Bridge Deck Overlays." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8143.

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The objectives of this research were to 1) compile a synthesis of information about polyester polymer concrete (PPC) from the literature; 2) conduct a scanning tour to observe PPC construction, inspect in-service PPC overlays, and discuss topics related to PPC; 3) revise the existing Utah Department of Transportation (UDOT) PPC specification; 4) document a PPC field demonstration project; and 5) perform laboratory characterization of the material properties of field-mixed PPC. The scope of the research included a scanning tour, field testing, and laboratory experimentation. The objectives of t

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Payberah, Amir. "Distributed Optimization of P2P Media Delivery Overlays." Licentiate thesis, SICS, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-23989.

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Media streaming over the Internet is becoming increasingly popular. Currently, most media is delivered using global content-delivery networks, providing a scalable and robust client-server model. However, content delivery infrastructures are expensive. One approach to reduce the cost of media delivery is to use peer-to-peer (P2P) overlay networks, where nodes share responsibility for delivering the media to one another. The main challenges in P2P media streaming using overlay networks include: (i) nodes should receive the stream with respect to certain timing constraints, (ii) the overlay shou

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46

Patel, Prakash Shashikant. "Diffusion problems and degradation of bearing overlays." Thesis, London Metropolitan University, 1989. http://repository.londonmet.ac.uk/3192/.

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The corrosion and degradation of Pb-Sn bearing overlays Is a bilateral process . During service, the lubricant becomes corrosive due to the breakdown of inhibitors with subsequent oxidation occurring at operating temperatures (120-170[degrees]). ...

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Cakmak, Mehmet. "Theoretical studies of structural and electronic properties of overlayers on semiconductor surfaces." Thesis, University of Exeter, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286574.

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48

Phan, Minh Son. "Dynamic response function and the theory of spin waves in metallic overlayers." Thesis, City, University of London, 1989. http://openaccess.city.ac.uk/20133/.

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A general recursion method (method of adlayers) for calculating the exact Green function in an arbitrary overlayer is developed. The method as presented applies to an s-band tight-binding Hamiltonian with hopping between nearest-neighbours only. The general.isation of the method to a multi-orbital band structure is described. The overlayer we consider is deposited above the (100) surface of a simple cubic semi-infinite nonmagnetic metallic substrate occupying the half-space z < O. The aim of the present thesis is twofold: firstly, the ground state of a ferromagnetic overlayer is investigated.

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Castillo, Barrero Rafael. "Platinium based catalysts for the PROX reaction. Influence of the carbon overlayers." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC292.

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Dans la technologie à l'hydrogène, l'oxydation préférentielle du CO en excès d'hydrogène (réaction PrOx) est un processus important pour l'obtention d'hydrogène sans CO pour les piles à combustible à membrane échangeuse de protons (PEMFC). Les catalyseurs à base de PtCu sont l’un des systèmes les plus étudiés pour les dispositifs mobiles en raison de leur bilan d’activité / sélectivité élevé et de leurs propriétés chimiques et mécaniques appropriées pour les procédures de démarrage / arrêt dans les conditions de fonctionnement des processeurs de combustible.Récemment, l'utilisation de catalyse

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Mastour, Eshgh Somayeh Sadat. "Distributed Reinforcement Learning for Overlay Networks." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92131.

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In this thesis, we study Collaborative Reinforcement Learning (CRL) in the context of Information Retrieval in unstructured distributed systems. Collaborative reinforcement learning is an extension to reinforcement learning to support multiple agents that both share value functions and cooperate to solve tasks. Specifically, we propose and develop an algorithm for searching in peer to peer systems by using collaborative reinforcement learning. We present a search technique that achieve higher performance than currently available techniques, but is straightforward and practical enough to be eas

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