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Dissertations / Theses on the topic 'Low-density material'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Omidy, Ali D. "Multiphase Interaction in Low Density Volumetric Charring Ablators." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/128.

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The present thesis provides a description of historical and current modeling methods with recent discoveries within the ablation community. Several historical assumptions are challenged, namely the presence of water in Thermal Protection System (TPS) materials, presence of coking in TPS materials, non-uniform elemental production during pyrolysis reactions, and boundary layer gases, more specifically oxygen, interactions with the charred carbon interface. The first topic assess the potential effect that water has when present within the ablator by examining the temperature prole histories of t

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2

Wang, Guizhou. "Method for Low Areal Density Material Structure Characterization: Soft X-ray Formation and Compressibility Measurement." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1432061677.

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3

ROMANIN, DAVIDE. "Electron-phonon interactions in low-dimensional carbon systems: superconductivity and charge-density waves." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2872341.

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4

Barros, Natália Garrote de 1984. "Propriedades de material polimérico obtido da reciclagem de embalagens multicamadas." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266576.

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Orientadores: João Sinézio de Carvalho Campos, Marco-Aurélio De Paoli<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-22T19:54:15Z (GMT). No. of bitstreams: 1 Barros_NataliaGarrotede_M.pdf: 8371421 bytes, checksum: b1ace4db177a03ca77cde81260779535 (MD5) Previous issue date: 2013<br>Resumo: Considerando a importância da reciclagem, o presente trabalho teve como objetivo apresentar as propriedades mecânicas, térmicas e reológicas do material polimérico obtido a partir do processo de reciclagem de embalagens m

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5

Matton, Yves S. M. Massachusetts Institute of Technology. "Use of low-density, reticulated, elastomeric foam impregnated with Newtonian and non-Newtonian fluids to design an impact absorption material." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65310.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 259-268).<br>The development of new threats in recent conflicts, such as improvised explosive devices (IEDs), requires the development of improved protection for US soldiers. The development of improved materials for helmets, in particular, is motivated by the social and economic costs of head injury. A versatile liner, adaptable to different types of helmets, with different constraints, would be useful. In this thesis,

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6

Schmidt, Joel Edward. "The Use of Ammonium Carbamate as a High Specific Thermal Energy Density Material for Thermal Management of Low Grade Heat." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1310666985.

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7

Pritchard, Joshua D. "Design, Fabrication, and Analysis of a Multi-Layer, Low-Density, Thermally-Invariant Smart Composite via Ultrasonic Additive Manufacturing." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406284899.

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8

MADDALA, PRANAY RAJ REDDY. "Investigation of Polymer packaging films behavior subjected to tension and tearing." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15002.

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The course of polymer film functioning has been a crucial concern in the advent of packaging technology. The thesis project aims towards obtaining an understanding of mechanical properties for a class of these materials, namely LDPE and PET. A constitutive understanding of this behavior in the case of LDPE is acquired through incorporating a plastic stress strain relationship in an iterative approach with focus put on the sensitivity of a few parameters by following a simple linear curve-fit technique in a way that the global as well as the local response are predictable. FE-models also develo

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9

Catto', C. "NEW STRATEGIES BASED ON NATURAL COMPOUNDS FOR CONTROLLING BIOFILM FORMATION." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/247231.

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Direct observations of a wide variety of natural habitats have established that 99% of microorganisms grow in form of biofilms, complex structured communities of microorganisms associated with surfaces and embedded in a self-produced extracellular polymeric substances. Biofilms are able to colonize every surface that offers minimal conditions for the life included all human artefact surfaces. Consequently, industrial installations, work benches, water distribution systems and also medical devices can be covered by biofilm with devastating consequences in terms of social and economic impact. Th

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10

Nouri, Nima. "Radiative Conductivity Analysis Of Low-Density Fibrous Materials." UKnowledge, 2015. https://uknowledge.uky.edu/me_etds/66.

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The effective radiative conductivity of fibrous material is an important part of the evaluation of the thermal performance of fibrous insulators. To better evaluate this material property, a three-dimensional direct simulation model which calculates the effective radiative conductivity of fibrous material is proposed. Two different geometries are used in this analysis. The simplified model assumes that the fibers are in a cylindrical shape and does not require identically-sized fibers or a symmetric configuration. Using a geometry with properties resembling those of a fibrous insulator, a nume

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11

Gawryla, Matthew Daniel. "Low Density Materials through Freeze-Drying:Clay Aerogels and Beyond…" Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1247013426.

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12

Félix, Vincent. "Caractérisation thermique de matériaux isolants légers. Application à des aérogels de faible poids moléculaire." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL095N/document.

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La problématique de la sauvegarde de l’énergie pose un certain nombre de défis à la science, en particulier celui de son efficacité. La conception et la caractérisation de nouveaux matériaux isolants thermiques plus performants se révèlent donc fondamentales dans cette perspective. Les aérogels se présentent comme de sérieux candidats dans ce domaine, leur procédé de fabrication confère à certains d’entre eux des caractéristiques extrêmes telles qu’une grande porosité et une faible masse volumique. La caractérisation thermique de tels matériaux est délicate, leur faible sensibilité aux flux th

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13

Shinko, Andrew. "Structure and Morphology Control in Polymer Aerogels with Low Crosslink Density." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1430399529.

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14

Poxon, Sara. "The mechanical response of low to high density Rohacell foams." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:94065572-8e3c-4e68-8e40-12f148093717.

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The main aim of this thesis is to generate a deeper understanding of the mechanical behaviour of cellular materials, specifically for their use in aerospace applications. A closed-cell polymer foam material (Rohacell) of various foam densities was chosen for this investigation, and a comprehensive experimental study was conducted which generated significant findings that hitherto have not been reported in the literature. The research presented in this study revealed the following: The quasistatic response of Rohacell foam displays a compression/tension asymmetry in moduli and strength. In-situ

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15

Feng, Chi. "SOFT X-RAY FORMATION MEASUREMENT OF LOW DENSITY MATERIALS AND COMPRESSIVE RESPONSE CHARACTERIZATION." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1350679879.

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16

Imani, Yengejeh Sadegh. "Theoretical understanding of mechanical properties of low-dimensional materials." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/408104.

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Low-dimensional materials including carbon nanotubes (CNTs), graphene, transition metal carbides and nitrides (MXenes), transition metal dichalcogenides (TMDs) and beyond have recently become the focus of intense research because of their outstanding physical and chemical properties. Amongst those characteristics, the mechanical properties of the low-dimensional systems play a significant role in exploring their potential applications in industrial sectors. Nevertheless, the mechanical characteristics of the low-dimensional material systems have not yet been fully understood. This is because d

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17

Kodavati, Venkata Seshank, and Devi Prasad Buraga. "Study of Numerical Model Parameters and Crack Tip of a Packaging Materials." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13840.

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Packaging industries widely use Low-Density Polyethylene (LDPE) in manufacturing different types of containers to store the food products. They are difficult to model numerically in order to have similar experimental response. This research deals with the study of numerical material model parameters of continuum LDPE. It is carried out with the help of experiments along with the numerical simulation of LDPE. Study of stress-strain distribution at crack tip and elements close to the tip is carried out in the LDPE material with the pre-existing center crack with varying lengths. By implementing

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18

Isaac, Bonad. "Thermo-mechanical characterisation of low density carbon foams and composite materials for the ATLAS upgrade." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3341/.

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As a result of the need to increase the luminosity of the Large Hadron Collider (LHC) at CERN-Geneva by 2020, the ATLAS detector requires an upgraded inner tracker. Upgrading the ATLAS experiment is essential due to higher radiation levels and high particle occupancies. The design of this improved inner tracker detector involves development of silicon sensors and their support structures. These support structures need to have well understood thermal properties and be dimensionally stable in order to allow efficient cooling of the silicon and accurate track reconstruction. The work presented in

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19

Musgrave, Christopher S. A. "Development of high energy laser target materials : synthesis of low density porous polymers, and characterisation using time domain nuclear magnetic resonace." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/7074.

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This work details the synthesis of low density porous polymers, and characterisation with an emphasis on Time Domain Nuclear Magnetic Resonance (TD-NMR). High energy laser physics utilises low density porous polymers to study astrophysical phenomena at high pressures and temperatures in the form of plasma. Low Z, low density Polymerised High Internal Phase Emulsions (PolyHIPE) and aerogels form a large part of these capabilities, however increasingly stringent laser target parameters are now required to develop new capabilities. For low density porous polymers, this demands greater control ove

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20

Andreev, Alexey. "Šumová spektroskopie detektorů záření." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-233425.

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Kadmium telurid je velmi důležitý materiál jak základního, tak i aplikovaného výzkumu. Je to dáno zejména jeho výhodnými elektronickými, optickými a strukturními vlastnostmi, které ho předurčují pro náročné technické aplikace. Dnes se hlavně používá pro jeho vysoké rozlišení k detekci a X-záření. Hlavní výhodou detektorů na bázi CdTe je, že nepotřebují chlazení a mohou spolehlivě fungovat i při pokojové teplotě. To způsobuje efektivnější interakce fotonů než je tomu u Si nebo jiných polovodičových materiálů. Obsahem této práce byla analýza a interpretace výsledků získaných studiem šumových a

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Pulicherla, Yashpal Surendhar Goud, and Ramkiran Kesana. "Experimental and Numerical Study of Orthotropic Materials." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15710.

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In current enterprises, simulations are being utilized to lessen the cost of product advancement. Along this line, there is an awesome enthusiasm for enhancing precision and accuracy of simulations. For an accurate and reliable simulation, it is essential to use an accurate material model and provide it with accurate material information. In exhibit industries, orthotropic materials are being simulated utilizing isotropic material model, as orthotropic material model requires more material data which is not promptly accessible. This proposal intends to test and identify orthotropic materials

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Euzébio, Junior Silvio Hendez. "Influência das ceras orgânicas nas propriedades de filmes tubulares de PEBD." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/186153.

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As poliolefinas, em especial os polietilenos (PE) são materiais poliméricos muito utilizados para a produção de filmes tubulares, sendo um dos materiais mais amplamente empregado na indústria de embalagens flexíveis. Dentre os diversos PE industriais, o polietileno de baixa densidade (PEBD) apresenta propriedades reológicas únicas em comparação aos PE lineares e os de alta densidade. A alta viscosidade e as numerosas ramificações longas encontradas neste polímero influenciam na redução da produtividade quando processados. Aditivos das mais variadas composições são adicionados ao polietileno du

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23

Ruggeri, Michele. "Quantum Monte Carlo simulations of two dimensional 3He: low-density gas-liquid coexistence on substrates and iterative backflow wave functions for strongly correlated systems." Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4854.

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In this thesis we show results of Quantum Monte Carlo simulations for fluid 3He in the ground state. We studied 3He in a quasi two dimensional environment and we designed a new class of trial wave functions for strongly correlated fermions. 3He is a typical example of Fermi liquid, and is the focus of several theoretical and experimental studies; since two dimensional 3 He in the ground state is believed to be a homogeneous liquid up to freezing, two dimensional 3He is the ideal system to study the effects of correlation in a wide density range. In this thesis we have worked in two regimes: w

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24

Wagner, Christian Friedemann. "Mechanical, Electronic and Optical Properties of Strained Carbon Nanotubes." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-226260.

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This dissertation deals with the calculation of the mechanical properties, electronic structure, electronic transport, and optical properties of strained carbon nanotubes (CNTs). CNTs are discussed for straintronics as their electronic bands show a strong strain-sensitivity. Further, CNTs are stiff, possess a large rupture strain and they are chemically inert, which make them a suitable material in terms of reliability and functionality for straintronic devices. Therefore, this work aims to explore the potential of strain-dependent CNT devices with regard to their mechanical, electronic, and o

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25

Zajaček, Jiří. "Šumová spektroskopie detektorů záření na bázi CdTe." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233498.

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The main object of this work is noise spectroscopy of CdTe radiation detectors (-rays and X–rays) and CdTe samples. The study of stochastic phenomenon and tracing redundant low-frequency noise in semiconductor materials require long-term measurements in time domain and evaluate suitable power spectral densities (PSD) with logarithmic divided frequency axes. We have used the means of time-frequency analysis derived from the discrete wavelet transform (DWT) and we have designed the effective algorithm for PSD estimation, which is comparable with an original analog method. CdTe single crystal wit

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Abedsoltan, Hossein. "Meso-Scale Wetting of Paper Towels." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501246506048675.

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Domingos, Luanda Gomes. "O efeito do tratamento da atapulgita no desenvolvimento de comp?sito com o polietileno reciclado." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12757.

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Made available in DSpace on 2014-12-17T14:07:03Z (GMT). No. of bitstreams: 1 LuandaGD_DISSERT.pdf: 2374976 bytes, checksum: 5b49cc11854aa2427f22f38d6ff109c2 (MD5) Previous issue date: 2012-08-24<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The study aimed at the treatment of attapulgite for the development and characterization of composite recycled low density polyethylene - PEBD_rec embedded with natural attapulgite - ATP_NAT, sifted - ATP_PN and attapulgite treated with sulfuric acid - ATP_TR in different compositions (1, 3 and 5%) and compared with the PEBD_rec. The

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Gallo--Frantz, Antoine. "Biaxial Strain Control of Electronic Properties of quasi 2D Materials." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP020.

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Dans le cadre de la recherche permanente de nouvelles propriétés des matériaux qui pourraient présenter un intérêt fondamental et applicatif, des efforts sont constamment déployés pour fabriquer de nouveaux matériaux et les étudier dans des conditions inédites. Pour ce faire, les diagrammes de phase doivent être étudiés de la manière la plus exhaustive possible. De nombreux paramètres sont couramment modifiés pour accéder aux paramètres physiques des matériaux : température, pression, champs magnétiques et électriques, dopage ou substitution chimique, etc. Dans ce travail, nous suivrons une no

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Chapeau-Blondeau, François. "Etude des mecanismes de polarisation electrique du polyethylene basse densite." Paris 6, 1987. http://www.theses.fr/1987PA066301.

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Cette these presente une etude des mecanismes de polarisation electrique du polyethylene basse densite, realisee au moyen d'une methode experimentale qui met en oeuvre la propagation d'une onde de pression induite par laser. Cette methode permet de mesurer, de facon non destructive, la repartition spatiale des charges ou des champs electriques dans un materiau dielectrique

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30

Selmani, Larbi. "Etude des défauts électriques associes à l'or et au fer dans le silicium." Lyon 1, 1985. http://www.theses.fr/1985LYO19018.

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Nous avons utilisé la diffusion thermique pour introduire des impuretés métalliques dans le silicium afin d'étudier les défauts électriquement actifs associés à celles-ci. Nous nous sommes particulièrement intéressés à l'or et au fer. La technique de spectroscopie transitoire a été employée comme outil de caractérisation. Nous avons analysé l'influence de la concentration d'or introduite sur les propriétés du centre accepteur (Ec - 0,55 eV) qui lui est associé (énergie d'activation et section efficace de capture). Il en ressort que celui-ci est probablement dû à différents états complexes. Dan

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Johansson, Martin. "Hårdgörning av Asp." Thesis, Växjö University, School of Technology and Design, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-2291.

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<p>Hårdgörning av trä syftar till att göra materialet hårdare. Detta går att åstadkomma genom komprimering, det komprimerade materialet tenderar dock att återgå mot sin ursprungsform då materialet utsätts för fukt om ingen låsning sker. Låsningen kan ske mekaniskt i en treskiktskonstruktion som motverkar träets fuktrörelser. Dessa skivor har dock visat sig vara instabila och tidigare försök har uppvisat deformationer i form av kupning. Denna undersökning syftar till att utreda förutsättningarna för att använda komprimerad asp samt att ta fram underlag för framtagning av en kommersiell produkt.

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Huin, Thibaut. "Experimental and numerical investigation of the mechanical behaviour of dissimilar arc and spot welds of advanced high strength steels." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI055/document.

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De nos jours, la politique écologique encourage les constructeurs automobiles à réduire le poids global du véhicule. Des tôles d'acier fines d'épaisseur différente optimisant chaque partie de l'assemblage sont utilisées et les sidérurgistes développent des aciers de plus en plus résistants à savoir l'Acier Haute Résistance Avancé (AHSS) avec un bon compromis entre résistance mécanique et ductilité (emboutissage). Lors des essais mécaniques de soudage hétérogène AHSS, des modes de fractures inhabituels sont observés, notamment le long de l'interface entre la zone affectée par la chaleur (ZAT) e

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Shaiek, Nesrine. "Etude expérimentale et théorique de couches moléculaires bidimensionnelles conductrices obtenues sur des surfaces orientées." Electronic Thesis or Diss., Aix-Marseille, 2022. http://theses.univ-amu.fr.lama.univ-amu.fr/221107_SHAIEK_360v291qsx248jrdp919wnla_TH.pdf.

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Les composés metal organic framework conducteurs c-MOF font partie d’une nouvelle classe de matériaux 2D, composés d'ions métalliques liés à des ligands organiques dans un réseau cristallin. Au cours de cette thèse nous avons étudié la croissance de 2D-MOF bien ordonnés M3C6O6, sous ultra-haut-vide, par réaction de surface entre des atomes de métaux de transition de cuivre et de manganèse et la molécule tétrahydroxyquinone THQ sur la surface d’argent Ag (111). Ces matériaux 2D sont étudiés par microscopie à effet tunnel (STM), diffraction d'électrons lents à basse énergie (LEED) et spectroscop

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Xu, Wan-Yu, and 徐婉瑜. "Studies on Low Smoke Free Halogen and Flame Retardant Material of Linear Low Density Polyethylene/Ethylene Vinyl Acetate polyblends." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9tkzj6.

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碩士<br>國立雲林科技大學<br>化學工程與材料工程系<br>105<br>Traditional wire is using halogen materials such as poly vinyl chlorid,chloroprene rubber,chlorosulfonated polyethylene to achieve the flame controlled. These halogen materials will release Carbon monoxide,hydrogen chloride when burning. This study mainly adds smoke suppressants,Halogen-free flame retardants,fillers for reinforcement (POE-MA、LLDPE-MA) on matrix (EVA/LLDPE) by using two roll mill及banbury mixer. Flame retardant standard is higher than 30% in limiting oxygen index (LOI) and low smoke standard followed ASTM E662 which reached smoke density lo

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Tom, Phakamile. "Optimization of dense medium cyclone plant for the beneficiation of low grade iron ore with associated high proportion of near-density material at Sishen Iron Ore Mine." Thesis, 2016. http://hdl.handle.net/10539/20042.

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A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the Degree of Master of Science in Engineering (Metallurgy and Materials Engineering) July 2015<br>The research report is premised on three aspects which are critical in the heavy mineral beneficiation. These aspects are classified as (i) understanding the densimetric profile of the available ore body, (ii) understanding the properties of the heavy medium utilised at the plant to beneficiate the ore, and (iii) the aut

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Карпенко, Ганна Володимирівна, Анна Владимировна Карпенко та Anna Karpenko. "Особливості формування структури та властивостей низькощільних вуглецевих композиційних матеріалів для теплоізоляції електровакуумного обладанання". Дисертація, 2017. https://dspace.znu.edu.ua/jspui/handle/12345/839.

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UA : Дисертаційна робота присвячена особливостям формування структури та властивостей низкощільних вуглецевих композиційних матеріалів методом висадження з водних суспензій на основі рубаного карбонізованого вуглецевого волокна, порошку фенолоформальдегідної смоли, порошку форполімеру та матеріалів – утворювачів пор, призначених для використання в якості теплоізоляційного матеріалу для електровакуумного обладнання, що працює при високих температурах. В результаті проведених досліджень гранулометричного складу водної суспензії розроблені структура і геометричні характеристики ви

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Kumar, Rahul. "Development of Low Bulk Density Fireclay Insulation Brick." Thesis, 2011. http://ethesis.nitrkl.ac.in/2579/1/rahul1_project_final.pdf.

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The present study deals with the development of low bulk density 0.54 to 0.88 g/cc, high cold crushing strength 8.95 to 79.97 kg/cm2 insulation brick using low cost raw materials. In the present study river silt is used as low cost raw materials in the insulation brick formulation. Effect of plastic clay to silt ratio on the proportion of insulation brick has been studied, and attempt has also be made to study the effect of pore former, firing temperature and calcined clay on the properties of insulation brick. The study suggest that incorporation of river silt enhance the strength of brick wh

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Xie, Jinqiao. "Low dislocation density GaN templates and their device applications /." 2007. http://hdl.handle.net/10156/1946.

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Reddy, Prasad A. "Studies In Low Density Polyethylene-Starch Blends." Thesis, 2004. https://etd.iisc.ac.in/handle/2005/1153.

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Reddy, Prasad A. "Studies In Low Density Polyethylene-Starch Blends." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1153.

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Raney, Jordan Robert. "Hierarchical Structures of Aligned Carbon Nanotubes as Low-Density Energy-Dissipative Materials." Thesis, 2012. https://thesis.library.caltech.edu/7009/7/thesis_officially_submitted_w_emfont_120508.pdf.

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<p>Carbon nanotubes (CNTs) are known to have remarkable properties, such as a specific strength two orders of magnitude higher than that of steel. It has remained a challenge, however, to achieve useful bulk properties from CNTs. Toward that goal, here we develop low-density bulk materials (0.1-0.4 g cm<sup>-3</sup>) entirely or nearly entirely from CNTs. These consist of nominally-aligned arrays of CNTs that display a dissipative compressive response, with a notable stress-strain hysteresis. The compressive properties of CNT arrays are examined in detail. This analysis reveals interestin

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Pandey, Prafull. "On the development of low mass density gamma strengthened Co-based superalloys." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4634.

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The work herein aims at developing new class of low mass density gamma-strengthened Co-based superalloys with good solvus temperature through systematic addition of Cr into the Co-Ni-Al- Mo-Ta based superalloy. The present thesis is divided into six chapters. The first chapter introduces various superalloys (Ni, Co and Fe-based) for high temperature applications. The timeline of different generations of Ni-based superalloys along with development in melting and casting techniques have been discussed in this chapter. All the gamma strengthened Co-based superalloys that are developed till

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Aranda, Macarena Jiménez. "Development, manufacturing and transformation of thermoplastic composite materials based on continous carbon fiber and low-density thermoplastic matrices." Master's thesis, 2019. http://hdl.handle.net/10884/1431.

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A composite is a material that is formed by combining two or more distinct materials, of which one is a binding material (known as matrix) and the other is a reinforcement material (which is generally a fiber). The matrix can be metallic, ceramic, or polymeric. The fiber can be carbon, glass, aramid, or natural. Resins are required to hold the fiber and bind material together while the fiber provides structure and strength to the composite. Composites that are manufactured using thermoplastic matrix are considered as thermoplastic composites. Thermoplastic composite is one of the fastes

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Tu, Liang-Chun, and 杜良駿. "Physical Properties of Low-Density Polyethylene/Silane Montmorillonite Nanocomposite Materials - After Grafted with Soft/Hard Graftingagent." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/38793073013974711388.

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碩士<br>清雲科技大學<br>機械工程研究所<br>96<br>Using a plastograph-mixer by the twin-screw mixed method to obtain the standard shaped specimens of Polymer-Clay Nanocomposites (PCN), to prepare LDPE/MMT nanocomposites pellets, grafting with two kinds of different surfactant Thermoplastic Polyolefin Elastomers (TPO) or Maleic Anhydride (MA). The chemical structure and polymer morphology of these as-synthesized PCN specimens were characterized by wide-angle powder X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). In addition, we prepare these experiment materials in order to probe into its mecha

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鄭偉宏. "Study on the Properties of Linear Low Density Polyethylene and Ethylene-Vinyl Acetate copolymer add Nitrogen Phosphorus Flame Retardant and Its Composite Materials." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65975550988098823119.

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碩士<br>臺北市立教育大學<br>自然科學系碩士班<br>97<br>Abstract Our laboratory used the linear low density polyethylene (LLDPE) and ethylene-vinyl acetate copolymer (EVA) and commercial nitrogen phosphorus flame retardant intumescent agent JLS-PNPl and organic clay and zinc borate that Association retardant, expect to produce the low smoke , halogen-free and Flame Retardant polymer composite materials, and we analyse their inter-molecular force, thermal properties, the nature of combustion and mechanical properties of materials. Experimental results show that polymeric materials to achieve good flame retardant

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Bhattacharyya, Swastibrata. "Tuning Electronic Properties of Low Dimensional Materials." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2778.

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Discovery of grapheme has paved way for experimental realization of many physical phenomena such as massless Dirac fermions, quantum hall effect and zero-field conductivity. Search for other two dimensional (2D) materials led to the discovery of boron nitride, transition metal dichalcogenides(TMDs),transition metal oxides(MO2)and silicene. All of these materials exhibit different electronic and transport properties and are very promising for nanodevices such as nano-electromechanical-systems(NEMS), field effect transistors(FETs),sensors, hydrogen storage, nano photonics and many more. For prac

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Bhattacharyya, Swastibrata. "Tuning Electronic Properties of Low Dimensional Materials." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2778.

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Discovery of grapheme has paved way for experimental realization of many physical phenomena such as massless Dirac fermions, quantum hall effect and zero-field conductivity. Search for other two dimensional (2D) materials led to the discovery of boron nitride, transition metal dichalcogenides(TMDs),transition metal oxides(MO2)and silicene. All of these materials exhibit different electronic and transport properties and are very promising for nanodevices such as nano-electromechanical-systems(NEMS), field effect transistors(FETs),sensors, hydrogen storage, nano photonics and many more. For prac

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Dal, Lago Virginia. "Dirección y manipulación de estados topológicos de la materia. Efectos en grafeno y otros materiales de baja dimensión." Bachelor's thesis, 2017. http://hdl.handle.net/11086/5979.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2017.<br>Los descubrimientos experimentales del grafeno y de los materiales aislantes topológicos han suscitado un gran interés en la comunidad científica. El objetivo de la presente tesis es estudiar los estados topológicos de borde del grafeno y otros materiales de baja dimensión, y analizar diferentes formas de manipulación y dirección de los mismos para obtener sistemas con nuevas propiedades. Para ello, empleamos como base el modelo SSH para polímeros conductores (presenta

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Amorim, Carlos de Oliveira. "Experimental and modeling studies of magnetoelectric multiferroic heterostructured materials." Doctoral thesis, 2019. http://hdl.handle.net/10773/27751.

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Multiferroic materials are a very exotic type of materials which present simultaneously two or more ferroic properties. Magnetoelectric multiferroics, in particular, are a very prominent class of materials, mainly due to their outstanding foreseen applications such as magnetic sensors, energy harvester/conversion devices, and high efficiency memories. However, intrinsic magnetoelectric materials are quite rare and do not have, yet, the adequate properties to the everyday applications. One of the reasons for this to occur is due to the requirements for magnetism and ferroelectricity in matter b

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Pérez, Piskunow Pablo Matías. "Efectos de la radiación en las propiedades eléctricas del grafeno : estados topológicos de Floquet inducidos por láser." Doctoral thesis, 2015. http://hdl.handle.net/11086/3563.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2015.<br>Esta tesis está dedicada al estudio teórico del grafeno iluminado por un láser intenso. Nos enfocamos en efectos no perturbativos de la luz sobre el material, utilizando la teoría de Floquet. Mostramos cómo un láser puede modificar la estructura electrónica del grafeno, alterando sus propiedades de conducción, y generando también características topológicas de otra manera ausentes en el material no iluminado. Verificamos la existencia de estados topológicos de Floquet c

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