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Thèses sur le sujet « Armour layer »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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1

Silva, Diogo Filipe Teixeira Cerqueira da. "Parameter analysis of the armour layer incoastal structures." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13993.

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Mestrado em Engenharia Civil<br>Coastal erosion is a serious problem that affects numerous countries and particularly Portugal. The sediment deficit, increasing urbanistic pressure and highly energetic coastal areas anticipate the necessity of large investments in shore protection structures. The design process of coastal structures is mainly dependent on empirical formulations, followed by tests on physical models to validate the design solutions. In these empirical formulations, the incorporation of several parameters in to coefficients, adds a level of subjectivity that is relevant on the

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Pratola, Luigi. "Studio dell'interazione tra moto ondoso e strutture marittime mediante modellazione fisica." Doctoral thesis, Universita degli studi di Salerno, 2015. http://hdl.handle.net/10556/1921.

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2012 - 2013<br>Le aree costiere rappresentano sistemi naturali del tutto unici, così come unici sono i fenomeni che le caratterizzano. L’erosione dei litorali, divenuta ormai un fenomeno di interesse planetario, ha spinto verso un approfondimento delle conoscenze dei processi costieri, consentendo di operare nella lotta ai suddetti fenomeni, attraverso strategie sempre più mirate e attente. Una migliore conoscenza dei processi costieri, infatti, può consentire agli ingegneri di adottare approcci più corretti nella progettazione di opere di protezione costiera. La principale fonte di sup

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3

Don, Rasika Perera Solangarachchige. "Investigation of fretting behaviour in pressure armour layers of flexible pipes." Thesis, Sheffield Hallam University, 2007. http://shura.shu.ac.uk/20219/.

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The incidence of fretting damage in the pressure armour wires of flexible pipes used in offshore oil explorations has been investigated. A novel experimental facility which is capable of simulating nub and valley contact conditions of interlocking wire winding with dynamic slip, representative of actual pipe loading, has been developed. The test set-up is equipped with a state of the art data acquisition system and a controller with transducers to measure and control the normal load, slip amplitude and friction force at the contact, in addition to the hoop stress in the wire. Tests were perfor

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4

Alavandimath, Shivaraj. "Local plastic deformation in pressure and tensile armour layers of flexible risers." Thesis, Sheffield Hallam University, 2009. http://shura.shu.ac.uk/7113/.

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Flexible pipes are commonly used for connecting seabed flow-lines to floating production facilities. The general riser design consists of an internal carcass for collapse resistance, a polymer fluid barrier, carbon steel interlocked circumferential pressure armour layer for resisting internal pressure loads, helically wound carbon steel tensile armour layers to resist axial loads and a watertight external sheath. Much of the analytical work that has been carried out on flexible composite pipe is based on the early stress analyses of wire ropes, and this is primarily because of the helical geom

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Johnson, Andrew. "Establishing design characteristics for the development of stab resistant Laser Sintered body armour." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16743.

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Stab resistant body armour had been used throughout history, with examples ranging from animal hide construction to the moulded Polycarbonate units typically used by United Kingdom (UK) Police Officers. Such protective articles have historically, and continue to present a number of issues which have shown to impair the operational performance of its wearer including but not exclusive to poor thermal regulation, large masses, and reduced manoeuvrability. A number of developments have been made in an attempt to minimise the effects of such issues. One potential solution yet to be fully explored

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Fehmi, Jeffrey S. "Research note: A rock mulch layer supported little vegetation in an arid reclamation setting." TAYLOR & FRANCIS INC, 2017. http://hdl.handle.net/10150/627088.

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Adding a surface rock layer (also called rock armor or rock mulch) to constructed slopes improves erosion resistance but has had mixed effects on revegetation. This study investigated the effects of rock layer depth (no rocks, 10-, 15-, and 20-cm rock layers) and rock size (5-20cm diameter rocks) on vegetation cover. Seeding was applied four times in the first 2 years. After 3 years, plots with a rock layer averaged 7% vegetative cover compared to 85% on plots without a rock layer. There was a nonsignificant trend toward less vegetation with a deeper rock layer.

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Dedeoglu, Mehmet Rifat. "An Experimental Study On The Stability Of Eastern Black Sea Coastal Highway Defense Structures." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1088178/index.pdf.

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Coastal regions are extensively utilized by constructing coastal structures and facilities, as a result of the economical potential they offer. In designing and construction of coastal structures, it is important to achieve an optimum design satisfying both the stability and the engineering economy requirements effectively, regarding the natural balance of the coastal region. In this study, first step model tests on the stability of the coastal protection structures of Eastern Black Sea Highway Project under construction, proved that the structure is not stable and safe under severe wave actio

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Hinton, Darren D. "Complexity of Bed-Load Transport in Gravel Bed Streams: Data Collection, Prediction, and Analysis." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3384.

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Bedload transport has long been known for its complexity. Despite decades of research, significant gaps of understanding exist in the ability to assess and predict bedload movement. This work introduces a comprehensive bedload database that is a compilation of field samples collected over the past 40 years; compares prediction formulae using a subset of the database; evaluates the influence of the armor layer on stream response to sediment input based on a hypothesis linked to one of the tested formulae, presents a mathematically manipulation of the empirical Pagosa Good/Fair formula for bedlo

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9

Novák, Jan. "Měření dynamických charakteristik zpětných armatur." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318147.

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Master thesis presents overview of existing types of check valves, their features, uses and issue called "cracking". Experimental part of this thesis focuses on the lift and swing check valves. Results of the measurement are evaluated from non-stationary flow point of view by developing and analyzing static and dynamic characteristics. This thesis takes into account losses and dynamic effects as main viewpoints. Two methods for measuring non-stationary velocities are used. Direct method called Gibson and indirect method laser doppler anemometry. Goal of the master thesis is to increase underst

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10

Newberry, Simon David. "An experimental investigation into the influence of geometric properties and construction techniques on the packing density of rock armour layers for coastal engineering structures." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406440.

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Hanhold, Brian J. "Weldability Investigations of Advanced High Strength Steels Produced by Flash Processing." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337795659.

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Genevois, Julia. "Etude du comportement de céramiques à blindage sous chargement de compression haute-vitesse par essais d’impact de plaque plan ou sans choc." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI106.

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Les matériaux céramiques sont largement utilisés dans la composition de blindages ou de structures de protection car ils permettent, à performances égales, un gain de masse important par rapport à leurs homologues en acier. Dans ces conditions, ils subissent des chargements extrêmes conduisant à des mécanismes de microplasticité et d’endommagement sous fort confinement et sous haute vitesse. Pour bien comprendre le comportement de ces matériaux il est nécessaire de procéder à une caractérisation du comportement mécanique sous des conditions de vitesse et de pression représentatives. Plusieurs

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13

Ozler, Basar. "A Case Study On The Submerged Berm Type Coastal Defense Structures." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605605/index.pdf.

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Coastal defense structures are built in order to protect valuable coastal regions from the destructive effects of the waves. Due to the cost of coastal defense structures and the economical potential of the coastal regions, failure of such structures could cause loss of high amounts of investment. Therefore in the design and construction of coastal structures, it is of vital importance to achieve an optimum design which is not neither underdesigned nor overdesigned. In this study, Submerged Berm type coastal defense structures with several different cross-sections were tested for stability un

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14

Reis, Isaac Bastos Correia. "Optimization of layer configurations for ballistic impact on light-weight armour plates." Master's thesis, 2019. http://hdl.handle.net/10773/28183.

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The broad field of engineering is facing a paradigm shift where advanced optimization methods and techniques are more often used to solve complex problems. Most of these problems either require the analysis of a large amount of data or the solving of complex calculations, or even both. This dissertation aims to develop an understanding of non-linear optimization algorithms applied to a complex engineering design problem: a multi-layer plate under a ballistic impact. To solve a complex design engineering problem, the most efficient way is to combine non-linear optimization algorithms wi

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15

Rocha, Pedro Miguel Monteiro da. "Optimisation of light-weight armour plates for energy absorption." Master's thesis, 2021. http://hdl.handle.net/10773/31406.

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Technology advances continue to revolutionise military equipment. The development of new firepower induces an interest in the enhancement of protection gear, both for transportation vehicles and personnel. There has been a significant amount of research of methods to increase protection capabilities without increases in the weight of a given defence system. This dissertation seeks to develop an optimisation tool that results in light-weight armour plates without compromising protection capabilities. A thorough study on the propagation of elastic and plastic stress waves aims for a bett

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16

Wang, Shi-Hao, and 王士豪. "Flume Experiment of Articulated Armor-Layer System Methods." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/19363054535693165260.

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碩士<br>中興大學<br>水土保持學系所<br>95<br>The study uses three kinds of experiment methods to simulate articulated armor-layer system to apply for control soil erosion, protection on downstream bed of the hydraulic structure, and then evaluation of the effects of armor-layer system. First, in sloping fields protection experiment, to determine the three basic elements which are light-shielding rate, surface roughness and apparent opening size of three common artificial geo-textiles in Taiwan and woodblock gridnets by related experimental equipment uses artificial rainfall instrument and hydraulic launders

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Ралко, Артур Володимирович. "Структурно-фазовий стан поверхневих шарів армко-заліза після лазерного легування сумішшю порошків нікелю, кобальту та хрому". Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/3698.

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Ралко А. В. Структурно-фазовий стан поверхневих шарів армко-заліза після лазерного легування сумішшю порошків нікелю, кобальту та хрому : кваліфікаційна робота магістра спеціальності 104 «Фізика та астрономія» / наук. керівник О. В. Смоляков. Запоріжжя : ЗНУ, 2020. 53 с.<br>UA : В роботі 53 сторінок, 13 рисунків, 2 таблиць та було використано 60 літературних джерел. Об’єкт дослідження – стрктурно-фазовий стан поверхневих шарів армко-заліза, після лазерного легування сумішшю порошків металів групи заліза. Мета роботи: встановити можливість створення за допомогою метода лазерного легування висо

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