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Dissertations / Theses on the topic 'Size and surface effects'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Blanco-Mantecon, Mireia. "Interactions, particle size and surface effects in magnetic nanoparticle systems." Thesis, Bangor University, 2000. https://research.bangor.ac.uk/portal/en/theses/interactions-particle-size-and-surface-effects-in-magnetic-nanoparticle-systems(2f7d3ef7-ef4c-43b0-b3ad-9e5c68f629e5).html.

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This work has involved the study of the magnetic behaviour of small magnetic nanoparticle systems. Due to the reduced size of magnetic nanoparticles they present distinctive properties, such as size and surface effects, that have been analysed in this work, as well as the effect of interactions in such systems. The samples chosen for the study were magnetite particles in the form of a ferrofluid and Co nanoclusters in a nonmagnetic matrix of Cu. Both systems present very narrow particle size distributions, which facilitates the interpretation of the data. The samples have been subjected to bas

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Liu, Chang. "Controlled Evaluation of Silver Nanoparticle Dissolution: Surface Coating, Size and Temperature Effects." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97509.

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The environmental fate and transport of engineered nanomaterials have been broadly investigated and evaluated in many published studies. Silver nanoparticles (AgNPs) represent one of the most widely manufactured nanomaterials. They are currently being incorporated into a wide range of consumer products due to their purported antimicrobial properties. However, either the AgNPs themselves or dissolved Ag+ ions has a significant potential for the environmental release. The safety issues for nanoparticles are continuously being tested because of their potential danger to the environment and human

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Fromm, Bradley S. "Incorporating Grain Size Effects in Taylor Crystal Plasticity." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1275.

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A method to incorporate grain size effects into crystal plasticity is presented. The classical Hall-Petch equation inaccurately predicts the macroscopic yield strength for materials with non-equiaxed grains or materials that contain unequal grain size distributions. These deficiencies can be overcome by incorporating both grain size and orientation characteristics into crystal plasticity theory. Homogenization relationships based on a viscoplastic Taylor-like approach are introduced along with a new function, the grain size and orientation distribution function (GSODF). Estimates of the GSODF

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Chan, Godine Kok Yan. "Effects of droplet size on intrusion of sub-surface oil spills." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79493.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, February 2013.<br>"February 2013." Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 86-90).<br>This thesis explores the effects of droplet size on droplet intrusion in sub-surface oil spills. Laboratory experiments were performed where glass beads of various sizes, which serve to simulate oil droplets in deepsea oil spills, were released vertically in a quiescent salinity stratified ambient and descended as multi-phase plumes. The two-tank stratification method wa

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5

Slaymaker, Elizabeth Ann. "Effects of surface active agents on drop size in liquid-liquid systems." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/10260.

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Wu, Yunhui. "Experimental Investigation of Size Effects on Surface Phonon Polaritons and Phonon Transport." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC012/document.

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La conduction thermique devient moins efficace à mesure que la taille des struc-tures diminuent en desous du micron, car la diffusion de surface des phononsdevient prédominante et limite plus efficacement les phonons que la diffusionphonon-phonon Umklapp. Des études récentes ont indiqué que les phonon po-laritons de surface (SPhPs), qui sont les ondes électromagnétiques évanescentesgénérées par l’hybridation des phonons optiques et des photons et se propageantà la surface d’une surface diélectrique polaire, pourraient servir de nouveauxvecteurs de chaleur pour améliorer les performances thermi

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Shen, Christopher. "Effects of surface chemistry and size on iron oxide nanoparticle delivery of oligonucleotides." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39520.

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The discovery of RNA interference and the increasing understanding of disease genetics have created a new class of potential therapeutics based on oligonucleotides. This therapeutic class includes antisense molecules, small interfering RNA (siRNA), and microRNA modulators such as antagomirs (antisense directed against microRNA) and microRNA mimics, all of which function by altering gene expression at the translational level. While these molecules have the promise of treating a host of diseases from neurological disorders to cancer, a major hurdle is their inability to enter cells on their own,

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Reynolds, Bryan. "Electronic Transport Properties of Nanonstructured Semiconductors: Temperature Dependence and Size Effects." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1463130513.

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9

Liu, Kai. "Process modeling of micro-cutting including strain gradient effects." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11112005-142011/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2006.<br>Melkote, Shreyes, Committee Chair ; Zhou, Min, Committee Member ; Liang, Steven, Committee Member ; Thadhani, Naresh, Committee Member ; Haj-Ali, Rami, Committee Member. Vita. Includes bibliographical references.

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Schoop, Julius M. "Engineered Surface Properties of Porous Tungsten from Cryogenic Machining." UKnowledge, 2015. http://uknowledge.uky.edu/cme_etds/49.

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Porous tungsten is used to manufacture dispenser cathodes due to it refractory properties. Surface porosity is critical to functional performance of dispenser cathodes because it allows for an impregnated ceramic compound to migrate to the emitting surface, lowering its work function. Likewise, surface roughness is important because it is necessary to ensure uniform wetting of the molten impregnate during high temperature service. Current industry practice to achieve surface roughness and surface porosity requirements involves the use of a plastic infiltrant during machining. After machining,

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11

Sarvari, Reza. "Impact of size effects and anomalous skin effect on metallic wires as GSI interconnects." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31636.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Meindl, James D.; Committee Member: Davis, Jeffrey A.; Committee Member: Gaylord, Thomas K.; Committee Member: Hess, Dennis W.; Committee Member: Peterson, Andrew F. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Muriithi, Beatrice Wanjku. "DESIGN AND CHARACTERIZATION OF NAFION®/EX-SITU SILICA NANOCOMPOSITE MEMBRANES: EFFECTS OF PARTICLE SIZE AND SURFACE MODIFICATION." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194152.

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This dissertation focuses on the preparation of new Nafion®/ ex-situ silica nanocomposites membranes and the impact of particle size of spherical silica particles on the nanocomposites' properties. To achieve acceptable power production, fuel cell polymer membranes are required with good proton conductivity, water retention, thermal and mechanical stability. However, to avoid poisoning of fuel cell electrocatalysts with CO or other fuel contaminants, they must be operated at temperatures (>100 °C). At these temperatures, fuel cell membranes dehydrate resulting in dramatic decreases in proto

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SCOPECE, DANIELE. "Surface and interface effects on the stability of SiGe nanoislands." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28452.

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Deposition of Ge upon Si substrates is the prototype of the mechanism called Stranski- Krastanov growth, i.e. the self-assembled formation of 3D islands, following the formation of a thin, 2D Wetting Layer. As is shown in Chapter 1, the nucleation of these islands is random and non-uniform when the deposition is performed upon the standard Si(001) substrate. Deposition of SiGe on different substrates of Si can lead, however, to a high degree of uniformity. Some examples are described in Chapters 3 and 4. The aim of this thesis is to supply a quantitative analysis for some peculiar pheno

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Varykhalov, Andrei. "Quantum-size effects in the electronic structure of novel self-organized systems with reduced dimensionality." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2005/578/.

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The Thesis is focused on the properties of self-organized nanostructures. Atomic and electronic properties of different systems have been investigated using methods of electron diffraction, scanning tunneling microscopy and photoelectron spectroscopy. Implementation of the STM technique (including design, construction, and tuning of the UHV experimental set-up) has been done in the framework of present work. This time-consuming work is reported to greater detail in the experimental part of this Thesis. <br><br> The scientific part starts from the study of quantum-size effects in the electroni

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Sun, Tik. "Classical Size Effect in Copper Thin Films: Impact of Surface and Grain Boundary Scattering on Resistivity." Doctoral diss., Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002959.

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Sorokin, A. M., I. P. Prosvirin, D. V. Demidov, and V. I. Bukhtiyarov. "Size Effect in Ethylene Oxidation over Silver Nanoparticles Supported on HOPG." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35147.

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A preparation procedure for a model catalyst – stable silver nanoparticles with a narrow size distribution supported on highly oriented pyrolytic graphite (Ag/HOPG) – is presented. This procedure is carried out under ultra high vacuum conditions and consists of three stages: 1 – surface defect formation by soft Ar+-treatment; 2 – silver deposition; 3 – defect annealing by heating at T = 300 °C. The analysis of oxygen forms on a silver surface was carried out by in-situ X-ray photoelectron spectroscopy (XPS). The simultaneous presence of two oxygen species (electrophilic and nucleophilic)

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Dong, Shuping. "Effects of acid hydrolysis conditions on cellulose nanocrystal yield and properties: A response surface methodology study." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/78102.

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Cellulose nanocrystals (CNCs) are frequently prepared by sulfuric acid hydrolysis of a purified cellulose starting material. CNC yields, however, are generally low, often below 20%. This study employs response surface methodology to optimize the hydrolysis conditions for maximum CNC yield. Two experimental designs were tested and compared: the central composite design (CCD) and the Box–Behnken design (BBD). The three factors for the experimental design were acid concentration, hydrolysis temperature, and hydrolysis time. The responses quantified were CNC yield, sulfate group density, ζ-potent

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Elbishari, Haitham Idris. "Characterisation of the effect of filler size on handling, mechanical and surface properties of resin composites." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/characterisation-of-the-effect-of-filler-size-on-handling-mechanical-and-surface-properties-of-resin-composites(64a8b96f-1cd0-459c-9865-1c5f35567982).html.

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Resin composites have been in the dental field for over forty years. They are now thought to be the most commonly used restorative material due to their aesthetic and mechanical properties. Although resin composites have high success rates as restorations, they do not offer all properties of an ideal restorative material. The aims of this research were to characterise the effects of variation in resin composite formulation on handling, mechanical; and physical properties. In particular the influence of the size and distribution of the inorganic components was investigated through the study of

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Wyche, Rebecca Ellen. "Exploring the Effect of Pore Size and Distribution on Shear Strength of Surface Porous Polyetheretherkeytone (PEEK)." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53740.

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Cervical spinal fusion cages are primarily used to stabilize intervertebral space and promote fusion between two vertebrae. Current cervical cages are made of either titanium or polyetheretherketone (PEEK), with PEEK recently becoming the more favorable choice due to its MRI compatibility. While previous research reveals ranges of pore diameters ideal for bone ingrowth, the effect of pore size, porosity, layer thickness and strut thickness on mechanical properties such as shear strength for PEEK, are not known at this time. The goal of this study was to determine the effect of pore size and o

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Rybařík, Jaroslav. "Vliv rozměrového účinku na integritu povrchu při vystružování s využitím moderní vystružovací hlavice MT3." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229942.

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The aim of this thesis is to design, implement and evaluate an experiment that verifies the influence the size effect on selected parameters of the surface integrity. For the experiment were used highly productive reaming head MT3 made by HAM-FINAL. Evaluation of the surface integrity was done in terms of the characteristics of the surface roughness, geometric tolerances and changes in microstructure. Furthermore, the influence of the depth of chips evaluated for changes in the feed force, cutting torque and changes in specific cutting energy. The theoretical part deals with the description of

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Foust, Nathaniel E. "A Spatiotemporal GIS Analysis of GPS Effects on Archaeological Site Variability." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439306878.

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Ozler, Emrah Talip. "Modelling Of Dropwise Condensation On A Cylindrical Surface Including The Sweeping Effect." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608440/index.pdf.

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The purpose of this study was to analyze the dropwise condensation on a cylindrical surface including the sweeping effect theoretically. For this purpose, first the problem of the equilibrium shape and departure size of drops on the outer surface of a cylinder was formulated. The equations of the surface of the drop were obtained by minimizing (for a given volume) the total energy of the drop which consists of surface and gravitational energy by using the techniques of variational calculus. The departure size of the droplets on a surface at varies angle of inclinations were also determined exp

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Lavén, Rasmus. "Ultra-Thin Ag Films on the Sn/Si(111)-√3×√3 Surface Studied by STM." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-67779.

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The growth of atomically flat silver films on Si(111) usually requires a two-step growth, including deposition at low temperature (≈100 K) followed by slowly annealing to room temperature. In addition, flat silver films are usually only obtained on Si(111) for film thicknesses larger than the critical thickness of 6 monolayer. In this work, Ag thin film formation at ambient temperature on Sn/Si(111)-√3×√3 has been investigated experimentally using a combination of scanning tunneling microscopy, scanning tunneling spectroscopy and low-energy electron diffraction. The first buffer layer, probabl

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Griend, M. C. van de, A. Lazaro, and H. J. H. Brouwers. "The Effect of Hydrothermal Treatment on Olivine Nano-Silica." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34915.

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This paper provides an overview of the effects of ripening the olivine nano-silica to form particles with a lower specific surface area for optimal use in high performance concrete. The nano-silica was ripened using a hydrothermal treatment in a mixed batch reactor at 90 °C, pH ranging from 8 to 10 and a silica weight percentage of three and six percent. The specific surface area of the olivine nano-silica can be reduced by 62 percent by Ostwald ripening in 22 hours. This reduction corresponds to a 80 percent drop of the micropore surface area and a 57 percent drop of the external surf

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Duthie, Tarryn-Lee. "Effects of sea surface temperature, adult size and adult condition on spatial variability in egg volumes of three pelagic species from the southern Benguela." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/6255.

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Word processed copy.<br>Includes bibliographical references (leaves 45-52)<br>Spatial variability in egg volume was investigated for anchovy, sardine and round herring in the southern Benguela in 1998, 2000 and 200 l. The relationship between sea surface temperature (SST) and egg volume was determined and the parental condition hypothesis was investigated through the relationships of adult size and condition with egg volume. General linear models for each species were used to determine the factors that were significantly related to egg volume at the scale of sample collection. Visual interpret

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Jiao, Feifei. "Investigation on micro-cutting mechanics with application to micro-milling." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12066.

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Nowadays technology development places increasing demands on miniature and micro components and products, and micro-milling is one of the most flexible machining processes in manufacturing 3D structures and complex structured surfaces. A thorough and scientific understanding on fundamentals of the micro-milling process is essential for applying it in an industrial scale. Therefore, in-depth scientific understanding of the micro-cutting mechanics is critical, particularly on size effect, minimum chip thickness, chip formation, tool wear and cutting temperature, etc. so as to fulfil the gap betw

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Arredondo, Melissa Gayle. "Zero-Dimensional Magnetite." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14151.

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Low-dimensional magnetic systems are of interest due to several new effects and modifications that occur at sizes below the average domain grain boundary within the bulk material. Molecule-like magnetite (Fe3O4) nanoparticles, with sizes ranging from one to two nm were synthesized and characterized in order to investigate new properties arising from quantum size effects. These small systems will provide opportunities to investigate magnetism of zero-dimension systems. A zero-dimensional object is usually called a quantum dot or artificial atom because its electronic states are few and sharply

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Troc, Nicolas. "Étude des propriétés optiques de nanoparticules d’argent sondées par spectroscopies optique et électronique." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1194/document.

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Cette thèse a pour but d'étudier les effets quantiques apparaissant pour des agrégats métalliques de très petite taille en raison de l'augmentation du ratio surface/volume et de la discrétisation de la structure électronique. Mettre en avant ces effets demande une très grande qualité de fabrication des nanoparticules étudiées, monodisperse dans le cas idéal. Nous fabriquons des nanostructures en encapsulant des agrégats d'argent générés par une source magnétron dans des matrices solides, comme la silice ou l'alumine. Cette technique nous permet de contrôler indépendamment la composition des pa

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Basudan, Ibrahim Basudan. "Pneumatic Polishing- New Polishing Method focusing on the effect of Abrasive Grain Size on Surface Roughness of Stainless Steel." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1511970445987042.

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Radwan, Islam Mohamed Othman. "Fate of Nanomaterials in the Environment: Effects of Particle Size,Capping agent and Surface Cleaning Products on the Stability of Silver Nanomaterials In Colloidal Consumer Products." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin15632953645698.

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Xia, Yang. "A robust statistical method for determining material properties and indentation size effect using instrumented indentation testing." Thesis, Compiègne, 2014. http://www.theses.fr/2014COMP1982/document.

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L'indentation instrumentée est un outil pratique et puissant pour sonder les propriétés mécaniques des matériaux à petite échelle. Cependant, plusieurs erreurs (rugosité de surface, effet de taille d’indentation, la détermination de premier point de contact, etc.) affectent l'essai d’indentation instrumentée (e.g. non reproductibilité de la courbe d’indentation) et conduisent à des imprécisions dans la détermination des propriétés mécaniques des matériaux analysés. Une approche originale est développée dans cette thèse pour la caractérisation précise des propriétés mécaniques des matériaux. Ce

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Hobiger, Manuel. "Polarisation des ondes de surface : caractérisation, inversion et application à l'étude de l'aléa sismique." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00577887.

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L'aléa sismique d'un site donné peut être largement influencé par des effets de site. Afin d'évaluer ces effets, la structure locale du sous-sol ainsi que les propriétés du champ d'onde doivent être étudiées. Les ondes de surface (ondes de Love et de Rayleigh) s'avèrent utiles, leurs propriétés (courbes de dispersion, ellipticité des ondes de Rayleigh) étant directement liées à la structure du sous-sol. Le paramètre clé pour l'identification du type d'onde est la polarisation. Dans la première partie de la thèse, de nouvelles méthodes pour l'estimation de paramètres de polarisation d'ondes de

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Kornder, Niklas Alexander. "Using Regression-Based Effect Size Meta-Analysis to Investigate Coral Responses to Climate Change." NSUWorks, 2016. http://nsuworks.nova.edu/occ_stuetd/415.

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Attempts to quantify the effects of ocean acidification and warming (OAW) on scleractinian corals provide a growing body of response measurements. However, placing empirical results into an ecological context is challenging, owing to variations that reflect both natural heterogeneity and scientific bias. This study addresses the heterogeneity of climate change induced changes in coral recruitment and calcification. To discern scientific bias and identify drivers of the remaining heterogeneity, 100 publications were analyzed using a combination of weighted mixed effects meta-regression and fact

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Ma, Jiayang. "Selective Observations of Chemical Structures of Heat-treated Poly(acrylonitrile) Films at The Surface and Core Regions by Solid-state NMR." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555600643937118.

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Faure, Bertrand. "Particle interactions at the nanoscale : From colloidal processing to self-assembled arrays." Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-79129.

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Nanostructured materials are the next generation of high-performance materials, harnessing the novel properties of their nanosized constituents. The controlled assembly of nanosized particles and the design of the optimal nanostructure require a detailed understanding of particle interactions and robust methods to tune them. This thesis describes innovative approaches to these challenges, relating to the determination of Hamaker constants for iron oxide nanoparticles, the packaging of nanopowders into redispersible granules, the tuning of the wetting behavior of nanocrystals and the simulation

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Sanders, Wesley Crowell. "Examining the Effects of Applied Potential on the Surface Charge of Functionalized Monolayers for Site-Directed Ionic Self Assembly." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29523.

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The focus of this dissertation research involves surface charge manipulation of functionalized monolayers. Application of potential to acid or base terminated organic films immobilized on electrodes results in the ionization of the terminal groups. The ionization of these groups using applied potential provides conditions favorable the control of polyelectrolyte deposition to the monolayer surface. Research is presented that asserts that the interfacial pH of acid or base terminated monolayers responds to applied potential as a result of the accumulation of phosphate counterions to the monola

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Hossain, Mohammad Moshin. "Effects of HCO3- and ionic strength on the oxidation and dissolution of UO2." Licentiate thesis, KTH, Chemistry, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4172.

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<p>The kinetics for radiation induced dissolution of spent nuclear fuel is a key issue in the safety assessment of a future deep repository. Spent nuclear fuel mainly consists of UO<sub>2</sub> and therefore the release of radionuclides (fission products and actinides) is assumed to be governed by the oxidation and subsequent dissolution of the UO<sub>2</sub> matrix. The process is influenced by the dose rate in the surrounding groundwater (a function of fuel age and burn up) and on the groundwater composition. In this licentiate thesis the effects of HCO<sub>3</sub>- (a strong complexing agen

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Strang, William Christopher. "THE FORMATION OF NANO-SIZED CHEMICAL DOMAINS AND THE SUBSEQUENT EFFECTS ON CONNECTIVE TISSUE ADHESION." Kent State University Honors College / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1418413006.

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Park, Heung-Shik. "Self-assembly of lyotropic chromonic liquid crystals: Effects of additives and applications." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1291043533.

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Aloi, Daniel Nicholas. "Development and verification of a mathematical model to investigate the effects of earth-surface-based multipath reflections at a differential global positioning system ground reference site." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175264170.

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Kuehnert, Julian. "Simulation of High Frequency Seismic Waves generated by Rockfalls on Real Topography." Thesis, Université de Paris (2019-....), 2019. https://theses.md.univ-paris-diderot.fr/KUEHNERT_Julian_va2.pdf.

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Les risques d'éboulements doivent être évalués et surveillés afin de prévenir les pertes de vies humaines et dommages aux infrastructures. A cet égard, il est important de créer des catalogues d'événements et de comprendre la dynamique des éboulements. Les ondes sismiques peuvent être utiles à cette fin, car elles transmettent des informations précieuses sur l'événement. Elles sont générées lorsque des éboulements touchent le sol et peuvent être utilisées pour détecter, classer et localiser des événements. Plus encore, on peut déduire des propriétés des éboulements telles que leur volumes et l

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El, khoury Christine. "Seismic ambient noise amplitude anomalies induced by an anticline structure : application to the context of gas reservoirs." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLM100.

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Des anomalies spectrales dans le bruit sismique ambiant, définies comme de fortes amplifications spectrales de la composante verticale pour des fréquences de 1 à 5 Hz, sont couramment observées au droit de réservoirs de gaz. Si elles sont bien comprises, ces anomalies pourraient avoir un potentiel pour l'exploration ou la surveillance des réservoirs de fluides. La nature de ces anomalies s'explique principalement par la structure géologique plutôt que par le réservoir lui-même, pour une modélisation purement élastique. L'analyse sur des jeux de données réels de bruit ambiant montre que les ond

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Hardie, Christopher David. "Micro-mechanics of irradiated Fe-Cr alloys for fusion reactors." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:a3ac36ba-ca6f-4129-8f37-f1278ef8a559.

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In the absence of a fusion neutron source, research on the structural integrity of materials in the fusion environment relies on current fission data and simulation methods. Through investigation of the Fe-Cr system, this detailed study explores the challenges and limitations in the use of currently available radiation sources for fusion materials research. An investigation of ion-irradiated Fe12%Cr using nanoindentation with a cube corner, Berkovich and spherical tip, and micro-cantilever testing with two different geometries, highlighted that the measurement of irradiation hardening was larg

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Robinson, Fiona. "Approaches to Understanding the Milling Outcomes of Pharmaceutical Polymorphs, Salts and Cocrystals. The Effect of Different Milling Techniques (Ball and Jet) on the Physical Nature and Surface Energetics of Different Forms of Indomethacin and Sulfathiazole to Include Computational Insights." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5412.

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The process of milling drugs to obtain samples with a desirable particle size range has been widely used in the pharmaceutical industry, especially for the production of drugs for inhalation. However by subjecting materials to milling techniques surfaces may become thermodynamically activated which may in turn lead to formation of amorphous material. Polymorphic conversions have also been noted after milling of certain materials. Salt and cocrystal formation is a good way of enhancing the properties of an API but little or no work has been published which investigates the stability of these en

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Dong, Yi. "Single site surface reactions : STM Studies." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30204.

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La demande des composants chimiques énantiopurs dans le secteur pharmaceutique est une des forces qui motive la recherche dans la création des catalyseurs homochiraux à la surface. La catalyse hétérogène est une méthode prometteuse pour la fabrication des produits énantiopurs puisqu'elle porte des avantages tels que la facilité de la séparation des produits désirés, la réutilisation du catalyseur et l'adaptabilité dans différentes conditions de la production en continu. La réaction d'Orito est un des exemples de la réaction hétérogène énantiosélective la plus réussie. Elle concerne l'hydrogéna

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Nilforoush, Rasoul. "Anchorage in Concrete Structures : Numerical and Experimental Evaluations of Load-Carrying Capacity of Cast-in-Place Headed Anchors and Post-Installed Adhesive Anchors." Doctoral thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66333.

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Various anchorage systems including both cast-in-place and post-installed anchors have been developed for fastening both non-structural and structural components to concrete structures. The need for increased flexibility in the design of new structures and strengthening of existing concrete structures has led to increased use of various metallic anchors in practice. Although millions of fasteners are used each year in the construction industry around the world, knowledge of the fastening technology remains poor. In a sustainable society, buildings and structures must, from time to time, be adj

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Pedersen, Helle Anette. "Étude de la diffraction tridimensionnelle des ondes sismiques dans des structures à géométrie bidimensionnelle : développement théorique et applications." Grenoble 1, 1994. http://www.theses.fr/1994GRE10212.

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La diffraction tridimensionnelle (3d) des ondes sismiques par des structures a geometrie bidimensionnelle (2d) est etudiee par la methode indirecte d'elements de frontiere (ibem, pour indirect boundary element method). Les ondes incidentes peuvent arriver en dehors du plan 2d et, en consequence, la diffraction est 3d avec couplage de tous les types d'onde. Ce travail est divise en trois parties. La theorie de ibem et son extension aux problemes de diffraction 3d par des structures 2d sont presentees dans la premiere partie. La deuxieme est consacree a l'application de la methode pour l'etude d

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AMARAL, PRISCILA O. "Caracterização química dos neonicotinóides em águas superficiais via cromatografia liquída de alta eficiência acoplada a espectrometria de massas em tandem (HPLC-MS/MS)." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/27879.

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Submitted by Pedro Silva Filho (pfsilva@ipen.br) on 2017-10-09T19:00:00Z No. of bitstreams: 0<br>Made available in DSpace on 2017-10-09T19:00:00Z (GMT). No. of bitstreams: 0<br>O presente estudo teve como propósito o desenvolvimento de um método para a determinação e a validação de uma metodologia para a identificação e quantificação de Neonicotinóides em águas superficiais coletadas na região de Bauru, no estado de São Paulo. As técnicas analíticas estudadas para o desenvolvimento deste método foram a cromatografia líquida de alta eficiência acoplada a espectrometria de massas em tandem (HPL

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Tekoğlu, Cihan. "Size effects in cellular solids." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/298794977.

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Siew, Y. H. "Diffusion size effects in zinc." Thesis, Cardiff University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370806.

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