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Tesi sul tema "Particle packing"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Chan, Ka-wai, and 陳嘉威. "Particle packing modeling incorporating the wedging effect." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50900055.

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The packing of solid particles is an important research topic in particle mechanics and powder technology. However, it is difficult to predict and measure the packing density of particles. Although theoretical models for prediction and test methods for measurement have been developed, the predicted values and measured results do not always agree with each other. Through in-depth review of the theoretical predictions by the existing 2-parameter model and the respective measured results, it is postulated in this thesis that the discrepancies between the predicted values and measured results are
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2

Zheng, Xiao-Qin Materials Science &amp Engineering Faculty of Science UNSW. "Packing of particles during softening and melting process." Awarded by:University of New South Wales. School of Materials Science & Engineering, 2007. http://handle.unsw.edu.au/1959.4/31517.

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Softening deformation of iron ore in the form of sinter, pellet, and lump ore in the cohesive zone of an ironmaking blast furnace is an important phenomenon that has a significant effect on gas permeability and consequently blast furnace production efficiency. The macroscopic softening deformation behavior of the bed and the microscopic deformation behavior of the individual particles in the packed bed are investigated in this study using wax balls to simulate the fused layer behavior of the cohesive zone. The effects of softening temperature, load pressure, and bed composition (mono - single
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3

Caulkin, Richard. "Applications of the DigiPac Model for Particle Packing." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491658.

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4

Chen, Xiaolin. "Particle packing, compaction and sintering in powder metallurgy." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0014/NQ34746.pdf.

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5

Che, Lida. "Numerical constitutive laws for powder compaction using particle properties and packing arrangement." Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/40677.

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Numerical studies, calibrated and validated using experiments, were carried out to develop a constitutive law for powder compaction. In order to simulate powder compaction at particle level, single particle compression/breakage test is used to characterise the mechanical properties, which include elastic modulus, Poisson’s ratio and yield strength. Finite Element Analysis (FEA) of single particle compression was carried out and validated vs. single particle compression testing and then used to establish a suitable hardening law. The particle size, shape and packing arrangement were obtained us
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6

Chellappah, Kuhan. "A study of the filtration of fibre/particle mixtures." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6323.

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This thesis investigates the constant pressure cake filtration of interacting cellulose fibre/TiO2 (rutile) mixtures, and involved experimental studies using an automated pressure filtration apparatus. The influence of suspension composition, filtration pressure and solution environment on filtration has been discussed in relation to cake properties such as average cake porosity and specific resistance. To help interpret the filtration results, sedimentation data were also obtained. The average porosities of filter cakes formed from pure rutile and fibre suspensions in deionised water were app
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7

Chao, Chien-Wei. "An Improved Dynamic Particle Packing Model for Prediction of the Microstructure in Porous Electrodes." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5632.

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The goal of this work is to develop a model to predict the microstructure of Li-ion batteries, specifically focusing on the cathode component of the batteries. This kind of model has the potential to assist researchers and battery manufacturers who are trying to optimize the capacity, cycle life, and safety of batteries. Two dynamic particle packing (DPP) microstructure models were developed in this work. The first is the DPP1 model, which simulates the final or dried electrode structure by moving spherical particles under periodic boundaries using Newton's laws of motion. The experience deriv
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8

Lohmander, Sven. "The influence of particle shape of coating pigments on their packing ability and on the flow properties of coating colours." Doctoral thesis, KTH, Pulp and Paper Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3044.

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<p>The influence of particle shape of coating pigments on theirpacking ability and on the flow properties of coating colourshas been investigated. The particle shapes considered werespherical, flaky and acicular (needle-shaped). In the case ofsuspensions containing monodisperse spherical polystyreneparticles, a concentration gradient appeared in the filter cakeforming during filtration under static conditions. Such agradient, monitoredby non-destructive magnetic resonanceimaging (MRI), is not accounted for in the traditionalfiltration theory used in coating technology. Good agreementwas found
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9

Conceição, Edilene de Souza. "Influência da distribuição granulométrica no empacotamento de matérias-primas na formulação de porcelânicos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-04112011-150732/.

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Materiais complexos como porcelanas e porcelanatos tem suas propriedades maximizadas quando atingem altas densidades finais após a sinterização. Contudo, a sua formulação contém no mínimo quatro matérias- primas diferentes, sendo o caulim a maior parte, mas também contendo quartzo e feldspatos. A granulometria final da mistura é controlada por uma única etapa de moagem de todos os materiais misturados. O objetivo deste trabalho foi obter combinações de diferentes granulometrias de ortoclásio, albita e quartzo com uma única granulometria de caulim através de cálculos de m
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10

Ng, Priscilla, Priscilla Ng, and Priscilla Ng. "Simulating Particle Packing During Powder Spreading For Selective Laser Melted Additive Manufacturing Using The Discrete Element Method In Abaqus." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2162.

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Metal additive manufacturing allows for the rapid production of complex parts that are otherwise impractical using conventional subtractive manufacturing techniques. Applications for additive manufacturing span across a broad array of industries including aerospace, automotive, and medical, among many others. One metric of printing success is material properties, including part density. While there has been extensive research completed for the density of printed parts, there is little published work concerning powder packing density on the build plate associated with powder spreading. In this
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11

Rodrigues, Andre Montes. "Modelagem e visualização de microestruturas digitais de materiais policristalinos monofásicos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-25062014-132720/.

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Neste trabalho se buscou criar uma base tecnológica para síntese digital e visualização virtual de microestruturas de materiais policristalinos monofásicos, visando disponibilizar software e metodologias de baixo custo aos pesquisadores da área ou de áreas correlatas. Para isso foram levantados e testados métodos, sistemas, bibliotecas e algoritmos computacionais pertinentes ao problema em questão. A técnica de síntese escolhida adotou uma simulação física de empacotamento de partículas seguida por tesselação espacial baseada no diagrama Voronoi. Para testar a abordagem uma amostra de um mater
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12

Ghasemi, Yahya. "Aggregates in Concrete Mix Design." Licentiate thesis, Luleå tekniska universitet, Byggkonstruktion och -produktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-61659.

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The importance of studying the behaviour and properties of concrete can be highlighted by considering the fact that concrete is the most used man-made material in the world. The very first step in making concrete is its mix design and deciding the type and amount of constitutes used in the production of concrete which should fulfil the requirements of the final product. Mix design models are commonly used for the purpose of proportioning concrete ingredients while anticipating the properties of the final product.  The current document deals with the commonly used principals in mix design model
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13

Lu, Ye. "Reconstruction, characterization, modeling and visualization of inherent and induced digital sand microstructures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37176.

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Strain localization, the phenomenon of large shear deformation within thin zones of intensive shearing, commonly occurs both in-situ and in the laboratory tests on soils specimens. The intriguing mechanism of strain localization and how it will affect the general behavior of soil specimens have been investigated by many researchers. Some of the efforts have focused on finding the links between material properties (void space, fabric tensor) and mechanical behavior (stress, strain, volumetric strain). In the last ten years, several extensive studies have been conducted at Georgia Tech to invest
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14

Hafid, Hamid. "Influence des paramètres morphologiques des granulats sur le comportement rhéologique des bétons frais : étude sur systèmes modèles." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1026/document.

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Les granulats naturels alluvionnaires sont utilisés actuellement à hauteur de 70 à 80% en volume dans la composition d'un béton et représentent désormais une ressource non renouvelable dont l'accessibilité diminue. Les formulations actuelles de béton visent à augmenter la part de granulats de roche massive concassés. Ces matériaux, de par leur histoire de fabrication, n'ont pas du tout la même morphologie. La substitution des granulats roulés par des granulats concassés affecte considérablement la mise en œuvre du matériau. Dans un premier temps, nous étudions spécifiquement l'influence de la
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15

De, Freitas Macedo Hian. "Concrete Made with Fine Recycled Concrete Aggregate (FRCA): A Feasibility Study." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39619.

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In the process of crushing concrete waste, significant amounts of fine by-products, the so called fine recycled concrete aggregates (FRCA), are generated and excluded from potential use. Limited research has thoroughly investigated the performance of concrete mixes with FRCA, very likely due to the complexity in analysing non-negligible amounts of adhered residual cement paste (RCP). Although some studies have proposed promising sustainable mix-design procedures accounting for the different microstructure when using coarse recycled concrete aggregates (CRCA), no similar approach exists for FRC
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16

Klement, Nathalie. "Planification et affectation de ressources dans les réseaux de soin : analogie avec le problème du bin packing, proposition de méthodes approchées." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22517/document.

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Les travaux de thèse présentés s’intéressent à l’optimisation des systèmes hospitaliers. Une solution existante est la mutualisation de ressources au sein d’un même territoire. Cela peut passer par différentes formes de coopération dont la Communauté Hospitalière de Territoire. Différents problèmes sont définis en fonction du niveau de décision : stratégique, tactique ou opérationnel ; et du niveau de modélisation : macroscopique, mesoscopique et microscopique. Des problèmes de dimensionnement, de planification et d’ordonnancement peuvent être considérés. Nous définissons notamment le problème
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17

Tagliaferri, de Grazia Mayra. "Contribution to the Understanding of Fresh and Hardened State Properties of Low Cement Concrete." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38109.

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Concrete, the major construction material used in the civil industry worldwide, displays remarkable performance and economic benefits. Yet, it also presents a huge environmental impact producing about 7% of the global carbon dioxide (CO2). Given the rise of global warming concerns, studies have been focusing on alternatives to reduce the amount of Portland cement (PC), which is the least sustainable ingredient of the mixture, for example by adopting particle packing model (PPM) techniques. Although a promising alternative, there is currently a lack of studies regarding the efficiently use of P
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18

Zhang, Yuqi. "Comportement mécanique du matériau granulaire en tenant compte de la rupture des particules." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0041/document.

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Le comportement mécanique de matériaux granulaires est intrinsèquement lié aux propriétés individuelles des grains constitutifs ainsi qu’à leur assemblage (texture, distribution des vides, contact entre grains…). Soumis à un chargement extérieur, cet assemblage se déforme incluant le déplacement relatif entre les particules mais également la déformation propre des grains jusqu’à leur rupture si elle se produit. Pour étudier la rupture d'une seule particule, des études expérimentales et numériques ont été réalisées. Quatre particules sphériques formées de billes d’argile expansée légère ont été
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19

Damineli, Bruno Luís. "Conceitos para formulação de concretos com baixo consumo de ligantes: controle reológico, empacotamento e dispersão de partículas." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-19092014-103459/.

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Devido à demanda dos países em desenvolvimento, a produção de cimento e as emissões de CO2 relacionadas aumenta progressivamente, colocando esta indústria sob pressão devido às preocupações com o aquecimento global. Como diminuir a produção não é uma opção sustentável do ponto de vista social, deve-se primar pela diminuição dos impactos ambientais mantendo-se o aumento da produção. Porém, as principais estratégias de redução das emissões substituição de clínquer por adições, aumento da eficiência de fornos e uso de combustíveis alternativos não são capazes de uma redução que compense o cre
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20

Eid, Mohd Nabil. "Proposal of a Mix Design Method for Low Cement Fiber Reinforced Concrete." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40586.

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Concrete, the second most used material in the world, presents great performance and economic benefits. Yet, it is often characterized by a brittle behaviour, low tensile strength, and toughness. Fibers are usually added to concrete to counteract its brittle behaviour, increasing ductility and toughness, controlling crack propagation and delaying concrete failure. However, their addition significantly worsens the fresh state performance of the material. To improve fresh state of the so-called Fiber Reinforced Concrete (FRC), conventional mix-design methods recommend the use of high paste conte
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21

Campos, Renan Serralvo. "Concreto autoadens?vel produzido com res?duos de constru??o e demoli??o: propriedades mec?nicas e reol?gicas." Pontif?cia Universidade Cat?lica de Campinas, 2017. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/919.

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Submitted by SBI Biblioteca Digital (sbi.bibliotecadigital@puc-campinas.edu.br) on 2017-03-23T12:34:35Z No. of bitstreams: 1 RENAN SERRALVO CAMPOS.pdf: 14804663 bytes, checksum: d21aa4db3ac6aef546c6f30dc795691b (MD5)<br>Made available in DSpace on 2017-03-23T12:34:35Z (GMT). No. of bitstreams: 1 RENAN SERRALVO CAMPOS.pdf: 14804663 bytes, checksum: d21aa4db3ac6aef546c6f30dc795691b (MD5) Previous issue date: 2017-02-15<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES<br>The high consumption of natural resources and energy, coupled with the significant amount of solid
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22

Weyers, Megan. "Optimised mix composition and structural behaviour of Ultra-High-Performance Fibre Reinforced Concrete." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/73097.

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The overall objective of this study was to develop an optimised Ultra-High-Performance Concrete (UHPC) matrix based on the modified Andreasen and Andersen optimum particle packing model by using available South African materials. The focus of this study was to determine the optimum combined fibre and superplasticiser content for UHPC by using a response surface design. The UHPC was appropriately designed, produced and tested. Various changes in mechanical properties resulting from different combinations of steel fibre and superplasticiser contents was investigated. The flowability, density a
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23

Montenegro, Ana M. C. "Studies of column packings for polymer separations by size exclusion and interactive chromatography." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/11754.

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The chromatographic behaviour of a new column packing for high performance size exclusion chromatography based on crosslinked polyacrylamide particles was studied. Experimental retention data for poly(ethylene glycol)and poly(ethylene oxide) standards in water and water-methanol mixtures showed that the separation mechanism is size exclusion, since a universal calibration plot based on hydrodynamic volume was obtained. For polysaccharide standards in water and water-methanol (80/20), the universal calibration was valid for molecular weights above 4 * 10~. Below this value, secondary mechanisms
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24

Champagne, Victor K. III(Victor Kenneth). "Energy dissipation in shape memory zirconia particles, packings, and composites." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123621.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 47-49).<br>This research project lies at the intersection of two classes of materials, namely superelastic materials and granular materials, each known for their ability to dissipate large amounts of kinetic energy. Because of their energy-absorbing properties, superelastic granular materials are of interest for development into applications involving force protection. Quasi-static, closed-die compressi
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25

Carleen, Bradford J. "Hydrothermal Synthesis Process for the Production of Silicalite-1 Crystal Aggregate Packing Particles." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/137.

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Methyl Tertiary-Butyl Ether (MTBE) contamination of groundwater and surface waters has become a relevant environmental and public safety concern in recent years. This anthropogenic compound is now persistent at low concentrations in several valuable ground and surface water locations within the United States due largely to the widespread production of MTBE for use as a fuel oxygenate in conjunction with negligent underground storage practices during the 1980's and 1990's. Though there are several treatment strategies for the remediation of MTBE spill sites, the most efficient strategy may be
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26

Joo, Sung Chul. "Adhesion mechanisms of nano-particle silver to electronics packaging materials." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31730.

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27

Bjorklund, Chad Christopher. "The effects of nucleosome core particle packaging on DNA charge transport." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Fall2006/c_bjorklund_120606.pdf.

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28

Karimi, Kamran. "Quenched Stresses And Linear Elastic Response Of Random Packings Of Frictionless Particles Near Jamming." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/356.

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We study stress correlations and elastic response in large-scale computer simulations of particle packings near jamming. We show that there are characteristic lengths in both the stresses and elastic response that diverge in similar ways as the confining pressure approaches zero from above. For the case of the stress field, we show that the power spectrum of the hydrostatic pressure and shear stress agrees with a field-theoretic framework proposed by Henkes and Chakraborty [15] at short to intermediate wavelengths (where the power is flat in Fourier space), but contains significant excess powe
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29

Elfmarková, Veronika. "Vliv jemnozrnných příměsí na charakter pórového systému betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225906.

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Literature does not provide a satisfactory answer to maximum and minimum particle size or the particle size of the mortar phase especially for optimal porosity of concrete. To overcome the shortcomings of the design methods were thought to design a new method for design of concrete mix. This idea is based on a complex analysis of powder materials (determination of granular properties, shape factor of fillers, porosity, packing of powder materials, surface area, etc.) and subsequently to assess the influence to pore system of concrete and physical and mechanical properties in hardened state of
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30

Olmedilla, González de Mendoza Antonio. "Grain motion and packing : application to metallic alloy solidification." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0265/document.

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La modélisation multi-échelle multi-physique de la solidification d'alliages métalliques demande de combiner des phénomènes à l'échelle macroscopique du produit et microscopiques à l'échelle des structures de solidification. Dans cette thèse, l'empilement aléatoire des grains équiaxes avec des morphologies typiques de solidification est étudié. Nous mettons tout d'abord en évidence les paramètres hydrodynamiques adimensionnels qui régissent l'empilement de grains équiaxes : le nombre de Stokes, St, le nombre d'Archimède, Ar, et le rapport entre le temps caractéristique de la croissance et le t
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31

Peña, Olarte Andrés Alfonso. "Influence of particle shape on the global mechanical response of granular packings : micromechanical investigation of the critical state in soil mechanics /." Stuttgart : IGS, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016794124&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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32

Pizzato, Massimo. "Retroviral vectors for gene therapy : characterisation of vector particle-cell interaction and development of novel packaging cell lines." Thesis, Institute of Cancer Research (University Of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313365.

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33

Cerqueira, Alex da Silva. "Uso de planejamento granulométrico para a preparação de dispersões aquosas para colagem em fitas de alumina." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-15072013-154810/.

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Abstract (sommario):
Este trabalho apresenta o uso de planejamento granulométrico na preparação e caracterização de suspensões concentradas de alumina em meio aquoso, que posteriormente deverão ser utilizadas para a conformação por colagem em fitas - processo de tape casting. A suspensão foi preparada utilizando-se duas ou mais distribuições granulométricas diferentes na sua formulação, a fim de promover a otimização do empacotamento de partículas. As condições para estabilização das suspensões preparadas foram obtidas por meio de estudos de comportamento reológico e através de curvas isotermas de adsorção, por me
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34

Nguyen, Thanh Hai. "Modélisation numérique et rhéologie des matériaux à particules déformables." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT273/document.

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Les matériaux à particules hautement déformables sont des formes complexes de matière avec de nombreuses applications en chimie, pharmacie, cosmétique et agro-alimentaire. L’effet conjugué du désordre et des grandes déformations des particules conduit à des propriétés mécaniques nouvelles par rapport aux matériaux à particules indéformables. En particulier, la compressibilité et la résistance au cisaillement sont contrôlées par une combinaison de réarrangements et de changement de forme des particules. Dans ce travail de thèse, nous avons développé une approche numérique originale pour la simu
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35

Olivarez, Nicholas Paul. "Role of the Small Terminase Subunit Encoded by Staphylococcus Aureus Pathogenicity Island SaPI1 in Formation of SaPI1 Transducing Particles." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/934.

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Staphylococcus aureus pathogenicity island SaPI1 is a genomic element that is mobilized and transduced at high frequency by helper phage 80α. SaPI1 encodes a small terminase protein that belongs to the phage small terminase subunit family. The presence of SaPI1-encoded small terminase suggests that it plays a role in SaPI1-specific packaging into transducing particles by complexing with the 80α large terminase subunit and redirecting recognition to a pac site on SaPI1 DNA from 80α DNA. The effects of deleting the small terminase genes in SaPI1 and in a prophage copy of 80α are consistent with
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36

Bastardo-Fernandez, Isabel. "Vers une fiabilité améliorée de la détermination de (nano)particules de TiO2 par single particle inductively coupled plasma-mass spectrometry : application à la caractérisation des aliments et aux études de migration." Electronic Thesis or Diss., Maisons-Alfort, École nationale vétérinaire d'Alfort, 2024. http://www.theses.fr/2024ENVA0001.

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Le projet de thèse NanoTi-Food vise principalement à améliorer la fiabilité de la caractérisation des nanoparticules de TiO2 (NPs) et à acquérir des connaissances sur l'additif alimentaire E171 y compris la migration de ces NP à partir des emballages alimentaires. Dans la première partie de l'étude (à réaliser à Anses), une nouvelle approche pour la caractérisation des NP de TiO2 sera développée et optimisée en utilisant l'approche « single particle » en combinaison avec la spectrométrie de masse à plasma à couplage inductif triple quadripôle (Sp-ICP- QQQMS). À cette fin, les paramètres analyt
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37

Hegron, Lise. "Suivi par émission acoustique de la compaction de particules fragiles d' UO2." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4740/document.

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Une option à l'étude pour le recyclage des actinides mineurs consiste à en incorporer environ 10% à une matrice d'UO2. La présence de pores ouverts interconnectés au sein de ce combustible devrait permettre d'évacuer l'hélium et les gaz de fission pour prévenir le gonflement de la pastille et in fine son interaction avec la gaine qui l'entoure. La mise en oeuvre des actinides mineurs oblige à travailler en cellule blindée, à minimiser leur rétention et à proscrire les ajouts de produits organiques. L'emploi de particules fragmentables de quelques centaines de micromètres paraît une solution in
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Cairnie, Mark A. Jr. "Bayesian Optimization of PCB-Embedded Electric-Field Grading Geometries for a 10 kV SiC MOSFET Power Module." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103566.

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A finite element analysis (FEA) driven, automated numerical optimization technique is used to design electric field grading structures in a PCB-integrated bus bar for a 10 kV bondwire-less silicon-carbide (SiC) MOSFET power module. Due to the ultra-high-density of the power module, careful design of field-grading structures inside the bus bar is required to mitigate the high electric field strength in the air. Using Bayesian optimization and a new weighted point-of-interest (POI) cost function, the highly non-uniform electric field is efficiently optimized without the use of field integration,
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Cao, Hong Ha. "The fabrication process of microfluidic devices integrating microcoils for trapping magnetic nano particles for biological applications." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112150/document.

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Le but de cette étude est de concevoir, fabriquer et caractériser une puce microfluidique afin de mettre en oeuve la capture de nanoparticules magnétiques fonctionnalisées en vue de la reconnaissance d’anticorps spécifiques (couplage d’une très grande spécificité et sensibilité). Après avoir modélisé et simulé les performances de la microbobine intégrée dans le canal de la puce microfluidique en prenant soin de limiter la température du fluide à 37°C, la capture devant être effective, le microsystème est fabriqué en salle blanche en utilisant des procédés de fabrication collective. La fabricat
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Kamp, William Hermanus Michael. "Redundant Number Systems for Optimising Digital Signal Processing Performance in Field Programmable Gate Array." Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/4623.

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Speeding up addition is the key to faster digital signal processing (DSP). This can be achieved by exploiting the properties of redundant number systems. Their expanded symbol (digit) alphabet gives them multiple representations for most values. Utilising redundant representations at the output of an adder permits addition to be performed without carry-propagation, yielding fast, constant time performance irrespective of the word length. A resource efficient implementation of this fast adder structure is developed that re-purposes the fast carry logic of low-cost field programmable gate array
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Uboldi, E. "THE ROLE OF OXYGEN PARTIAL PRESSURES ON CHEMICAL AND BIOCHEMICAL PROPERTIES OF RED MEATS." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/232644.

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Meat is an essential component of a balanced diet, since it is a source of important nutrients totally or almost absent in all other foods. The distribution and sale of fresh meat products present many critical points, and a major concern is the product waste due to uncorrected practices at all levels (i.e. farmer, slaughter house, processor, distributor, retailer, consumer) and short shelf lives. In addition to good manufacturing practices and consumer education, meat packaging can help in prolonging the shelf life of meat products. In fact, the possibility to determine and control the oxygen
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Rebmann, Markus Samuel. "Durabilidade de concretos estruturais com baixo consumo de cimento Portland e alta resistência." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-10062011-150726/.

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Este trabalho apresenta um estudo sobre a confecção de concretos estruturais com baixo consumo de cimento Portland e avalia algumas das suas propriedades no estado fresco e endurecido, tanto em termos mecânicos como de durabilidade. O uso de concretos de baixo consumo de cimento Portland tem por objetivo possibilitar maior sustentabilidade da indústria da construção baseada no concreto, como maior longevidade de jazidas, reduções na emissão de \'CO IND.2\' e no consumo de energia e menores custos de transporte. Possibilita também diversas melhorias técnicas, como menor retração, fissuração e c
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43

Hernando, Louis. "Sédimentation de suspensions non-colloïdales poly-dispersés et concentrées." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14490/document.

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De la pâte à dentifrice au moût de fermentation en passant par la peinture, le lit d’une rivière, le propergol d’un réacteur de fusée et le sang, les suspensions sont présentes dans de nombreux usages de notre vie courante. La maîtrise de leur mise en œuvre notamment nécessite la compréhension de leur comportement et constitue un des challenges de la recherche. Dans le présent travail de thèse, nous nous sommes intéressés au processus de sédimentation de suspensions concentrées de particules non-colloïdales et inertes dont la distribution de taille est mono, bi ou tri-disperse. Deux types de s
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44

Reynes, Hugo. "Conception d'un module électronique de puissance pour application haute tension." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI035.

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Satisfaire les besoins en énergie de manière responsable est possible grâce aux énergies renouvelables, notamment éoliennes et solaires. Cependant ces centres de captation d’énergie sont éloignés dans zones de consommation. Le transport de l’énergie via des réseaux HVDC (haute tension courant continu) permet un rendement et une flexibilité avantageuse face au transport HVAC (haute tension courant alternatif). Ceci est rendu possible grâce aux convertisseurs utilisant l’électronique de puissance. Les récents développements sur les semi-conducteurs à large bande interdite, plus particulièrement
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SYU, HUAN-TING, and 徐煥庭. "Feasibility Study on Building Well-Made Particle Packing Using Compressible Packing Model." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/03131194756052739967.

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碩士<br>國立臺灣科技大學<br>營建工程系<br>103<br>The volume of aggregates occupies by more than 70 vol. % of concrete. The packing problem of aggregates has a decisive influence on concrete quality, The concrete which is made by a good packing condition will have a better performance on all aspects of strength, permeability and economy, etc. . Most previous researches use experimental method to get the mixing proportion with maximum packing density of aggregates in order to reach the goal of dense grading. This study, used the compressible packing model (CPM) which has proposed by the scholar de Larrard in 1
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Wong, Vivian, and 黃暉然. "A 3-parameter particle packing model for spherical and non-spherical particles." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/09100505588370585222.

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Yang, Cheng-Tao, and 楊承道. "Simulation System for Three Dimensional Particle Packing." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/75292581717371457894.

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碩士<br>國立成功大學<br>土木工程學系<br>87<br>In this thesis we present a 3-D model that is able to simulate the packing process of granular particles. We use 3-D ellipsoids as well as polyhedra as the surrogate to simulate natural particle. Assuming mechanical forces non-existant, we model and solve the packing of granular particles as an optimum problem. The research is presented in two aspects. First we use the model to estimate of the maximum packing density for a set of given particles, which has application in determinating the maximum density of granular soil. Secondly we attempt to estimate the part
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"Structural Characteristics and Applications of Hard-particle Packings via Event-driven Molecular Dynamics Simulations." Master's thesis, 2014. http://hdl.handle.net/2286/R.I.26868.

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abstract: In this dissertation, the results of our comprehensive computational studies of disordered jammed (i.e., mechanically stable) packings of hard particles are presented, including the family of superdisks in 2D and ellipsoids in 3D Euclidean space. Following a very brief introduction to the hard-particle systems, the event driven molecular dynamics (EDMD) employed to generate the packing ensembles will be discussed. A large number of 2D packing configurations of superdisks are subsequently analyzed, through which a relatively accurate theoretical scheme for packing-fraction prediction
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Chen, Jen Chang, and 陳仁彰. "The Study of Particle Packing using 2-D Computer Simulation." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/75175783739121851921.

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碩士<br>國立海洋大學<br>材料工程研究所<br>90<br>The particle packing structure affects the properties of particulate materials. This study is to simulate the 2-D packing structure by using computer simulation. The four simulation programs were developed to simulate different packing structure: (1) 2-D mono-sized sphere ordered packing; (2) 2-D mono-sized sphere random packing; (3) 2-D mono-sized sphere random close packing; (4) 2-D multi-sized sphere random packing. The programs were written by Java programming language. The advantage of Java is web-based programming. All of the simulation program
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Zi-JieLin and 林子傑. "Particle Packing in Green Bodies Formed through Slip Casting with Fine Alumina Powders." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/j97rz3.

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