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Dissertations / Theses on the topic 'Composts collectifs'

Author: Grafiati

Published: 21 January 2023

Last updated: 31 July 2025

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1

Kohli, Alice. "Effets de composts autoproduits et d'un biochar sur le transfert d'éléments trace dans des légumes de jardins familiaux modérément contaminés." Thesis, Rennes, Agrocampus Ouest, 2022. http://www.theses.fr/2022NSARD098.

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Les jardins familiaux ont souvent été installés sur des sols urbains sans évaluation préalable du risque sanitaire. Le diagnostic de contamination du sol par des éléments trace comme le plomb (Pb) peut compromettre la poursuite du jardinage. Pour éviter un changement d’usage, l’apport au sol de compost industriel peut être efficace mais le potentiel des composts autoproduits par les jardiniers eux-mêmes doit être évalué. Ce travail de thèse a eu pour premier objectif d’analyser les pratiques de compostage dans les jardins familiaux et sélectionner des composts autoproduits différents en termes

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2

Harrison, James A. "Turning compost : a collection of 40 poems." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/7832.

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Turning Compost is a collection of forty poems, two of which, Seven Kakhaiku and Tres Troubled Triolets, are multiple poems intended to be read as units. The poems have been ordered so that there is a flow of connected or contrasting ideas from poem to poem, therefore it is recommended that they be read in the order presented. The themes covered by the poems are varied, but principal amongst them are memory, nature, dreams and symbols, family and friends, and the search for meaning; they appear in roughly that order. Death, and its challenges to meaning, is a theme which recurs throughout the

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3

Taliani, Alexandra R. "An Annotated Catalog of the Music of Eusebia Simpson Hunkins in the Music and Dance Library Special Collections Room and the Mahn Center for Archives and Special Collections of Ohio University." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1587141633610687.

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4

Demchyna, O. I., I. Yu Yevchuk, and R. Y. Musiy. "Nanostructed Organic-inorganic Composite for Application in Fuel Cells and Solar Collectors." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35382.

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The paper describes the synthesis of nanostructed organic-inorganic composites using sol-gel technique. The presence of sulfocontaining monomer (3-sulfopropyl acrylate potassium salt) in obtained comonomer provides its proton conductive properties. Proton conductivity depending on temperature was determined by means of impedance spectrometry. Nanostructed organic-inorganic composites have been applied for obtaining thermoabsorbing coatings for solar collectors. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35382

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5

Morel, Matthieu. "Composants pour la grille." Phd thesis, Université de Nice Sophia-Antipolis, 2006. http://tel.archives-ouvertes.fr/tel-00263646.

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L'objectif de cette thèse est de faciliter la conception et le déploiement d'applications distribuées sur la Grille, en utilisant une approche orientée composants. Les problématiques du calcul sur grilles abordées dans notre proposition sont : la complexité de conception, le déploiement, la flexibilité et la performance. Nous proposons et justifions un modèle de composants et son implantation. Le modèle proposé repose sur le modèle de composants Fractal et sur le modèle des objets actifs. Il bénéficie d'une part, de la structure hiérarchique et de la définition précise du modèle Fractal, et d'

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6

Nakamura, Yasuyuki. "Static and dynamic properties of collective phenomena in systems composed of formal neurons." Kyoto University, 1995. http://hdl.handle.net/2433/160765.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第6036号<br>工博第1433号<br>新制||工||988(附属図書館)<br>UT51-95-D355<br>京都大学大学院工学研究科数理工学専攻<br>(主査)教授宗像豊哲, 教授片山徹, 教授足立紀彦<br>学位規則第4条第1項該当

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Ganapathy, Visvanathan 1957. "Structural analysis of stretched membrane reflector modules using advanced composites." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276569.

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The concept of achieving low cost (≈ $20/m²) and ultra low weight (5 kg/m²) for heliostats is explored theoretically and experimentally. The objective of this work is to significantly improve the cost and performance of the structure under concern, without sacrificing strength and efficiency. The focus is on an innovative design of stretched-membrane heliostats. A reflective membrane of thin film is supported by a taut fishnet structural membrane consisting of graphite fiber-polymer matrix composite. The reflective and structural membranes are attached to a ring frame made of wood. The nonline

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8

Gao, Qian. "Microstructure and fracture toughness of the in-situ NiAl-Ni??3Al intermetallic composites." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22204.pdf.

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9

Contreras, Maria Elena. "Paradoja: concerto for orchestra [score]." Diss., Temple University Libraries, 2008. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/969.

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Music Composition<br>D.M.A.<br>Paradoja: Concerto for Orchestra consists of three contrasting movements: slow, fast, slow (Paradoja = "paradox," Sp.). These movements are framed by a motif that opens and closes each of them, and connects them all. This framing motif is based on an alternation between a rhythmical pattern in the bass drum, and a melody sung by a boy mezzo-soprano, both over a string pedal. The first movement, Lamentos (Sorrows), is dramatic in character; it goes from simple to complex in its orchestration, harmony, texture, dynamics and tempo changes. The second movement, Algar

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Goward, Gillian Ruth. "Physical characterization of tin composite oxides and related anode materials for lithium ion batteries." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0028/NQ51198.pdf.

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11

Freihofer, Gregory J. "Enhancing CNT-composites with Raman spectroscopy." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4763.

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Carbon Nanotubes (CNTs) have been the subject of intense research for their potential to improve a variety of material properties when developed as nano-composites. This research aims to address the challenges that limit the ability to transfer the outstanding nano-scale properties of CNTs to bulk nano-composites through Raman characterization.These studies relate the vibrational modes to microstructural characterization of CNT composites including stress, interface behavior, and defects. The formulation of a new fitting procedure using the pseudo-Voigt function is presented and shown to minim

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12

Alajmi, Faleh. "Water sorption of flowable composites." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/367584.

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Oral Biology<br>M.S.<br>ABSTRACT Objectives: Flowable composites are characterized by lower filler loading and a greater proportion of diluent monomers in their formulation. These composites were traditionally created by retaining the same small particle size of the conventional hybrid composites, but reducing the filler content and allowing the increased resin to reduce the viscosity of the mixture However, their various mechanical properties such as flexural strength and wear resistance have been reported to be generally inferior compared to those of the conventional composites. Dental resto

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Contreras, Maria Elena. "Paradoja [dissertation]." Diss., Temple University Libraries, 2008. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/926.

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Music Composition<br>D.M.A.<br>Paradoja: Concerto for Orchestra consists of three contrasting movements: slow, fast, slow (Paradoja = "paradox," Sp.). These movements are framed by a motif that opens and closes each of them, and connects them all. This framing motif is based on an alternation between a rhythmical pattern in the bass drum, and a melody sung by a boy mezzo-soprano, both over a string pedal. The first movement, Lamentos (Sorrows), is dramatic in character; it goes from simple to complex in its orchestration, harmony, texture, dynamics and tempo changes. The second movement, Algar

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14

Sun, Ying. "Mechanical properties of carbon nanotube/metal composites." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4611.

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Carbon nanotubes (CNTs) have captured a great deal of attention worldwide since their discovery in 1991. CNTs are considered to be the stiffest and strongest material due to their perfect atomic arrangement and intrinsic strong in-plane sp[super]2--sp[super]2 covalent bonds between carbon atoms. In addition to mechanical properties, CNTs have also shown exceptional chemical, electrical and thermal properties. All these aspects make CNTs promising candidates in the development of novel multi-functional nanocomposites. Utilizing CNTs as fillers to develop advanced nanocomposites still remains a

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15

Shin, Dongho. "Microstructual Characteristics of Magnesium Metal Matrix Composites." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5494.

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Magnesium (Mg) Metal matrix composites (MMCs) reinforced by ceramic reinforcements are being developed for a variety of applications in automotive and aerospace because of their strength-to-weight ratio. Reinforcement being considered includes SiC, Al2O3, Carbon fiber and B4C in order to improve the mechanical properties of MMCs. Microstructural and interfacial characteristics of MMCs can play a critical role in controlling the MMCs' mechanical properties. This study was carried out to understand the microstructural and interfacial development between Mg-9wt.Al-1wt.Zn (AZ91) alloy matrix and s

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16

Dumpson, Donald. "FOUR SCHOLARS' ENGAGEMENT OF WORKS BY CLASSICAL COMPOSERS OF AFRICAN DESCENT: A COLLECTIVE CASE STUDY." Diss., Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/261236.

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Music Education<br>Ph.D.<br>The purpose of this research was to investigate ways classical composers of African descent have been included in the mainstream academic canon. I examined the insights of four scholars who have been committed to including classical composers of African descent throughout their music careers. The initial research questions of this study were: 1) How do participants describe their frameworks for making the commitment to include classical composers of African descent throughout their careers? 2) What have been the challenges and benefits associated with their commitme

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Song, Young-Kyu. "Phase equilibria in the Ni-Si-Mg system and fracture toughness of selected in-situ intermetallic composites." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60567.pdf.

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18

Tsoi, Marvin S. "Modeling of thermal properties of fiber glass polyester resin composite under thermal degradation condition." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4711.

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Composites, though used in a variety of applications from chairs and office supplies to structures of U.S. Navy ships and aircrafts, are not all designed to hold up to extreme heat flux and high temperature. Fiber-reinforced polymeric composites (FRPC) have been proven to provide the much needed physical and mechanical properties under fire exposure. FRPC notable features are its combination of high specific tensile strength, low weight, along with good corrosion and fatigue resistance. However FRPC are susceptible to thermal degradation and decomposition, which yields flammable gas, and are t

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19

Chaplin-Kyzer, Abigail. "Searching for Songs of the People: The Ideology of the Composers' Collective and Its Musical Implications." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1157558/.

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The Composers' Collective, founded by leftist composers in 1932 New York City, sought to create proletarian music that avoided the "bourgeois" traditions of the past and functioned as a vehicle to engage Americans in political dialogue. The Collective aimed to understand how the modern composer became isolated from his public, and discussions on the relationship between music and society pervade the radical writings of Marc Blitzstein, Charles Seeger, and Elie Siegmeister, three of the organization's most vocal members. This new proletarian music juxtaposed revolutionary text with avant-garde

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20

TRAETTEBERG, OLA. "Le mode collectif de l'onde de densite de spin dans les composes (tmtsf)#2(asf#6)#1##x(sbf#6)#x." Paris 11, 1993. http://www.theses.fr/1993PA112141.

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Nous avons etudie l'effet sur le diagramme de phase et sur le transport du mode collectif de l'onde de densite de spin (ods) en fonction du desordre dans des alliages de conducteurs organiques: (tmtsf)#2(asf#6)#1##x(sbf#6)#x, ou la concentration x varie de 0 a 1. L'effet du desordre sur les proprietes a une particule et le diagramme de phase est faible mais sensible. L'effet sur l'accrochage de l'ods est grand, ce qui est observe dans le champ seuil pour la conductivite non lineaire et dans la constante dielectrique statique. La relaxation dielectrique montre une distribution de temps de relax

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21

Tenery, Daeri. "IMAGING AND SPECTROSCOPY OF CONDUCTING POLYMER-FULLERENE COMPOSITE MATERIALS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3241.

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Since the development and optical study of conjugated (conducting) polymers it has become apparent that chain conformation and aggregation at the molecular scale result in complex heterogeneous nanostructured bulk materials for which a detailed insight into morphological, spectroscopic as well as optoelectronic properties and mechanisms is overwhelmingly difficult to obtain. Nanoparticles composed of the conjugated polymer poly (MEH-PPV) and nanocomposite nanoparticles consisting of MEH-PPV doped with 1-(3-methoxycarbonylpropyl)-1-phenyl-C61 (PCBM) were prepared as model systems to study these

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22

Gibson, Jason. "Nano-Particles in Multi-Scale Composites and Ballistic Applications." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5745.

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Carbon nanotubes, graphene and nano sized core shell rubber particles have all been extensively researched for their capability to improve mechanical properties of thermoset resins. However, there has been a lack of research on their evaluation for energy absorption in high velocity impact scenarios, and the fundamental mechanics of their failure mechanisms during highly dynamic stress transfer through the matrix. This fundamental research is essential for laying the foundation for improvement in ballistic performance in composite armor. In hard armor applications, energy absorption is larg

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Hofmeister, Clara. "Development of Nitrogen Concentration During Cryomilling of Aluminum Composites." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5791.

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The ideal properties of a structural material are light weight with extensive strength and ductility. A composite with high strength and tailorable ductility was developed consisting of nanocrystalline AA5083, boron carbide and coarser grained AA5083. The microstructure was determined through optical microscopy and transmission electron microscopy. A technique was developed to determine the nitrogen concentration of an AA5083 composite from secondary ion mass spectrometry utilizing a nitrogen ion-implanted standard. Aluminum nitride and amorphous nitrogen-rich dispersoids were found in the nan

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Pinapati, Kishore. "VARIATION OF GEOTECHNICAL STRENGTH PROPERTIES WITH AGE OF LANDFILLS ACCEPTING BIOSOLIDS." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3992.

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The solid portion of waste disposal, known as Municipal Solid Waste (MSW) can be landfilled. Landfilling has proved to be a safe, sanitary and economical method of disposal. A by-product from wastewater treatment plants called biosolids is sometimes co-disposed along with MSW in landfills. Recent work at the University of Central Florida has focused on the behavior of the mixture of MSW and biosolids. As an increased amount of waste accumulates in these landfills, it creates a new problem  the geotechnical stability of landfills. In current literature, classical geotechnical testing meth

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amini, manesh navid. "HEAT TRANSFER IN MULTI-LAYER ENERGETIC NANOFILM ON COMPOSITES SUBSTRATE." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3191.

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The main purpose of this work is the physical understanding and the numerical description of the reaction of the dense metastable intermolecular composition (MIC). Energy density of MIC is much higher than conventional energetic material; therefore, MIC finds more applications in the propellant and explosive system. The physical model includes the speed of propagation and rate of reaction, and the relationship between the layer thickness, heat rate, and length of the flame based on physical model. In Part I of this thesis, a one-dimensional model based on Weihs was developed for 20 pairs of a

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Bai, Jing. "PERCOLATION STUDY OF NANO-COMPOSITE CONDUCTIVITY USING MONTE CARLO SIMULATIONPERCOLATION." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4168.

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A Monte Carlo model is developed for predicting electrical conductivity of carbon nanofiber composite materials. The conductive nanofibers are models as both 2D and 3D network of finite sites that are randomly distributed. The percolation behavior of the network is studied using the Monte Carlo method, which leads to the determination of the percolation threshold. The effect of the nanofiber aspect ratio on the critical nanofiber volume rate is investigated in the current model, each of the nanofibers needs five independent geometrical parameters (i.e., three coordinates in space and two orien

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Amini, Manesh Navid. "Heat transfer in multi-layer energetic nanofilm on composites substrate." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4587.

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Numerical model was also used to estimate three major variables for a range of 30-60 m/s. In fact, the maximum combustion flame temperature that corresponds to flame speed along with the length of the flame, density of the product behind the flame, and maximum penetration depth in steady reaction, were calculated. These studies will aid in the design of nEM multilayer thin film. As further numerical and experimental results are obtained for different nEM thicknesses, a unified model involving various parameters can be developed.; The main purpose of this work is to find a physical and numerica

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Long, Xiang. "Numerical study on reinforcement mechanism of copper/carbon nanotubes composite." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5409.

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Because of its high stiffness, carbon nanotubes (CNTs) are considered as one of the widely used reinforcement materials in the metal matrix composites. In this thesis, finite element (FE) models were built in Ls-Dyna3D to simulate Copper/CNTs composite deformation and fracture, and to explore CNTs reinforcement mechanisms. Several possible mechanisms were discussed. Deformation and failure of Cu/CNT composites were studied numerically using unit cell FE models, which consist of both metal matrix and CNTs. The simulation results have been verified by existing experiment data reported by C

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Jones, Ashley. "Low Strain Rate Studies of Alumina Epoxy Composites using Piezospectroscopy." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5957.

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Particulate composites are widely used in many aerospace and military applications as energetic materials, armor materials or coatings and their behavior under dynamic loads have gained increasing significance. The addition of modifiers such as alumina nanoparticles generally facilitates the improvement of the mechanical strength to density ratio due to high specific area and particle rigidity. This allows for sufficient particle-matrix bonding and therefore improved stiffness and load transfer in the composite. Photo-luminescent ?-alumina nanoparticles when embedded in an epoxy matrix allow f

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LIU, XIAOXIAO. "A Preliminary Study on Water Collection Ability of Nanofibers Derived from Electrospun Polymers." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1573050761831223.

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Hegg, Meredith Michelle. "Exact Relations and Links for Fiber-Reinforced Elastic Composites." Diss., Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/164322.

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Mathematics<br>Ph.D.<br>Predicting the effective elastic properties of a composite material based on the elastic properties of the constituent materials is extremely difficult, even when the microstructure is known. However, there are cases where certain properties in constituents always carry over to a composite, regardless of the microstructure of the composite. We call such instances exact relations. The general theory of exact relations allows us to find all of these instances in a wide variety of contexts including elasticity, conductivity, and piezoelectricity. We combine this theory wit

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Zhao, Yao. "STUDY ON METAL-NANOCARBON COMPOSITES: PROCESSING, CHARACTERIZATION, AND PROPERTIES." Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/595185.

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Mechanical Engineering<br>Ph.D.<br>Introduction of nanocarbons, such as graphene and carbon nanotubes, to metal matrices, may enhance the electrical and thermal transport, mechanical properties and some other properties of the composite materials. However, uniform distribution of the nanocarbon phase in the matrix material and manufacturing the composites in large scale can be challenging using traditional mixing methods. In this study, a facile method to fabricate metal-nanocarbon composites was developed. Firstly, copper (Cu)-polydopamine (PDA) composite was fabricated by coating Cu powders

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Vermelle, Marie-Christine. "Collectif de travail et identites professionnelles. Le cas des ouvriers et techniciens d'un service de fabrication de composants de pointe." Lille 1, 1989. http://www.theses.fr/1989LIL12008.

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Partant des theses qui, rompant avec le paradigme techniciste, mettent au centre des transformations du travail et de la production, l'effet d'integration en amont de l'activite dans l'etude et la conception des produits, cette recherche analyse les rapports au travail et a la formation des salaries, concus comme constitutifs de leurs identites professionnelles. La construction de ces identites s'appuie sur une analyse approfondie du travail (par observation directe et entretiens) dans un service assurant le transfert recherche-developpement-production de composants electroniques de pointe, pa

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Reilly, Barry M. Lugg Elizabeth T. "Teacher compensation and student achievement the relationship between salaries & benefits and ISAT & PSAE composite scores /." Normal, Ill. : Illinois State University, 2007. http://proquest.umi.com/pqdweb?index=0&did=1441197951&SrchMode=2&sid=6&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1216233095&clientId=43838.

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Thesis (Ed. D.)--Illinois State University, 2007.<br>Title from title page screen, viewed on July 16, 2008. Dissertation Committee: Elizabeth Lugg (chair), Joseph M. Pacha, Zeng Lin, Neil Sappington. Includes bibliographical references (leaves 163-170) and abstract. Also available in print.

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Kerr, Brittany. "Strengthening Potential of Single-Walled Carbon Nanotubes in Phenolic Resin Composites." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2219.

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Strengthening potential of single-walled carbon nanotubes (SWCNTs) in a phenolic resin composite was evaluated by characterization of purified and phenyl sulfonated SWCNTs, investigation of the load transfer capability of the purified SWCNTs, and characterization of the composites. Purified and phenyl sulfonated SWCNTs, as well as their composites, were examined by Raman spectroscopy, thermogravimetric analysis, scanning electron microscopy equipped with energy dispersive spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and ultra violet-visible spectrometry. Fab

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Pai, Anil. "DEVELOPMENT OF TITANIUM NITRIDE/MOLYBDENUM DISULPHIDE COMPOSITE TRIBOLOGICAL COATINGS FOR CRYOCOOLERS." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2886.

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Hydrogen is a clean and sustainable form of carrier of energy that can be used in mobile and stationary applications. At present hydrogen is produced mostly from fossil sources. Solar photoelectrochemical processes are being developed for hydrogen production. Storing hydrogen can be done in three main ways: in compressed form, liquid form and by chemical bonding. Near term spaceport operations are one of the prominent applications for usage of large quantities of liquid hydrogen as a cryogenic propellant. Efficient storage and transfer of liquid hydrogen is essential for reducing the launch co

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Draper, Robert. "Novel Nanostructures and Processes for Enhanced Catalysis of Composite Solid Propellants." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5929.

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The purpose of this study is to examine the burning behaviour of composite solid propellants (CSP) in the presence of nanoscale, heterogenous catalysts. The study targets the decomposition of am- monium perchlorate (AP) as a key component in the burning profile of these propellants, and seeks to identify parameters of AP decomposition reaction that can be affected by catalytic additives. The decomposition behavior of AP was studied in the presence of titanium dioxide nanoparticles in varying configurations, surface conditions, dopants, morphology, and synthesis parameters with the AP crystals.

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Tipton, Bradford. "PREVENTION OF ENVIRONMENTALLY INDUCED DEGRADATION IN CARBON/EPOXY COMPOSITE MATERIAL VIA IMPLEMENTATION OF A POLYMER BASED COATI." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4226.

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As the use of fiber reinforced plastics increases in such industries as aerospace, wind energy, and sporting goods, factors effecting long-term durability, such as environmental exposure, are of increasing interest. The primary objectives of this study were to examine the effects of extensive environmental exposure (specifically UV radiation and moisture) on carbon/epoxy composite laminate structures and to determine the relative effectiveness of polymer-based coatings at mitigating degradation incurred due to such exposure. Carbon/epoxy composite specimens, both coated and uncoated, were subj

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Navale, Kunal. "FINITE ELEMENT SIMULATION OF REPAIR OF DELAMINATED COMPOSITE STRUCTURES USING PIEZOELECTRIC LAYERS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3119.

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Damage in composite material fabricated aerospace, aeronautical, mechanical, civil and offshore structures often results from factors such as fatigue, corrosion and accidents. Such damage when left unattended can grow at an alarming rate due to the singularity of the stress and strain in the vicinity of the damage. It can lead to increase in the vibration level, reduction in the load carrying capacity, deterioration in the normal performance of the component and even catastrophic failure. In most conditions, the service life of damaged components is extended with repair instead of immediate re

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Carro, Rodolphe Valentin. "HIGH PRESSURE TESTING OF COMPOSITE SOLID ROCKET PROPELLANT MIXTURES: BURNER FACILITY CHARACTERIZATION." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3204.

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Much Research on composite solid propellants has been performed over the past few decades and much progress has been made, yet many of the fundamental processes are still unknown, and the development of new propellants remains highly empirical. Ways to enhance the performance of solid propellants for rocket and other applications continue to be explored experimentally, including the effects of various additives and the impact of fuel and oxidizer particle sizes on burning behavior. One established method to measure the burning rate of composite propellant mixtures in a controlled laboratory se

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McKee, James. "Development and Characterization of Nanoparticlee Enhancements in Pyrolysis-Derived High Temperature Composites." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6320.

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Thermal protection systems, which are commonly used to protect spacecraft during atmospheric entry, have traditionally been made of materials which are traditionally high in manufacturing costs for both the materials needed and the manufacturing complexity, such as carbon-carbon composites and aerogels. In addition to their manufacturing costs, these materials are also limited in their strength, such as PICA, in a way that necessitate the use of tiles as opposed to single structures because they are not capable of supporting larger structures. The limitations of polymer reinforced composites

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O'Neill, Kevin. "FEASIBILITY STUDY OF LIGHTWEIGHT HIGH-STRENGTH HOLLOW CORE BALSA-FRP COMPOSITE BEAMS UNDER FLEXURE." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3109.

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The United States of AmericaÂ s Military, more specifically the Army, has since the late 1990Â s had a vested interest in the development of super-lightweight, portable, short-span composite bridge and decking components to replace aging heavy metal-alloy machine driven modular systems. The following study looks at the feasibility of using balsa wood as the structural core material in fiber reinforced polymer (FRP) wrapped hollow-core composites in short-span bridge applications. The balsa provides shear resistance and the FRP the flexural resistance, resulting in extremely high strength-to-we

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Haber, Zachary. "ON THE USE OF POLYURETHANE MATRIX CARBON FIBER COMPOSITES FOR STRENGTHENING CONCRETE STRUCTURES." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4105.

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Fiber-reinforced polymer (FRP) composite materials have effectively been used in numerous reinforced concrete civil infrastructure strengthening projects. Although a significant body of knowledge has been established for epoxy matrix carbon FRPs and epoxy adhesives, there is still a need to investigate other matrices and adhesive types. One such matrix/adhesive type yet to be heavily researched for infrastructure application is polyurethane. This thesis investigates use of polyurethane matrix carbon fiber composites for strengthening reinforced concrete civil infrastructure. Investigations on

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Anderson, Jordan. "Electrochemical Studies of Nanoscale Composite Materials as Electrodes in Direct Alcohol Fuel Cells." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5104.

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Polymer electrolyte membrane fuel cells (PEMFCs) have recently acquired much attention as alternatives to combustion engines for power conversion. The primary interest in fuel cell technology is the possibility of 60% power conversion efficiency as compared to the 30% maximum theoretical efficiency limited to combustion engines and turbines. Although originally conceived to work with hydrogen as a fuel, difficulties relating to hydrogen storage have prompted much effort in using other fuels. Small organic molecules such as alcohols and formic acid have shown promise as alternatives to hydrogen

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Slade, Robert Arthur. "Failure Analysis of Impact-Damaged Metallic Poles Repaired With Fiber Reinforced Polymer Composites." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5505.

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Metallic utility poles, light poles, and mast arms are intermittently damaged by vehicle collision. In many cases the vehicular impact does not cause immediate failure of the structure, but induces localized damage that may result in failure under extreme service loadings or can promote degradation and corrosion within the damaged region. Replacement of these poles is costly and often involves prolonged lane closures, service interruption, and temporary loss of functionality. Therefore, an in situ repair of these structures is required. This thesis examines the failure modes of damaged meta

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Abourezq, Ibraheem. "VOIDS IN SONIC FILLTM RESTORATIONS COMPARED TO TRADITIONAL INCREMENTALLY-FILLED COMPOSITE RESTORATIONS." Master's thesis, Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/282233.

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Oral Biology<br>M.S.<br>SonicFillTM is a new composite resin and delivery system designed to provide rapid filling of cavity preparations by decreasing viscosity through application of sonic energy. However, it may produce unwanted air voids in the final restoration due to the short filling time. Air voids compromise long-term performance by providing weak foci, discontinuity at cavosurface margins and at internal cavity walls, and potential crack propagation. This study assessed the locations, sizes, and numbers of voids in SonicFill restorations compared with traditional composite resin rest

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Robert, Kévin. "Vers la fabrication collective de micro-supercondensateurs à électrodes interdigitées à base de nitrure de vanadium déposé en technologie couche mince." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I082/document.

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Les objets mobiles connectés prennent une place prépondérante dans notre vie de tous les jours mais l’autonomie énergétique est à ce jour limitée. Ainsi, le développement de dispositifs de stockage d’énergie performants et miniaturisés est un domaine en pleine expansion. Les performances de ces systèmes dépendent des matériaux dont sont constituées leurs électrodes et de l’électrolyte utilisé. Cette thèse est consacrée à la fabrication de micro-supercondensateurs à électrodes interdigitées composées de films minces de nitrure de vanadium (VN) déposé par pulvérisation cathodique. La modulation

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Uribe, Restrepo Catalina. "Process-dependent microstructure and severe plastic deformation in SiCp?? reinforced aluminum metal matrix composites." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4712.

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Discontinuously reinforced MMCs with optimized microstructure are sought after for exceptional high strain rate behavior. The microstructure evolution of a stir-cast A359 aluminum composite reinforced with 30 vol.% SiCsubscript p] after isothermal anneal, successive hot-rolling, and high strain rate deformation has been investigated. Quantitative microstructural analysis was carried out for the as-cast, annealed (470??C, 538??C and 570??C) and successively hot rolled specimens (64, 75, 88, and 96% rolling reductions). Selected composites were also examined after high strain rate deformation. X

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DeMarco, James P. Jr. "Mechanical characterization and numerical simulation of a light-weight aluminum A359 metal-matrix composite." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4933.

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Aluminum metal-matrix composites (MMCs) are well positioned to replace steel in numerous manufactured structural components, due to their high strength-to-weight and stiffness ratios. For example, research is currently being conducted in the use of such materials in the construction of tank entry doors, which are currently made of steel and are dangerously heavy for military personnel to lift and close. However, the manufacture of aluminum MMCs is inefficient in many cases due to the loss of material through edge cracking during the hot rolling process which is applied to reduce thick billets

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Ramirez, Castrillo Ana Catalina. "Costa Rican Composer Carlos Escalante Macaya and his Concerto for Clarinet and Strings." Diss., Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/272856.

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Music Performance<br>D.M.A.<br>The purpose of this monograph is to promote Costa Rican academic music by focusing on Costa Rican composer Carlos Escalante Macaya and his Concerto for Clarinet and Strings (2012). I hope to contribute to the international view of Latin American composition and to promote Costa Rican artistic and cultural productions abroad with a study of the Concerto for Clarinet and Strings (Escalante's first venture into the concerto genre), examining in close detail its melodic, rhythmic and harmonic treatment as well as influences from different genres and styles. The monog

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