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Dissertations / Theses on the topic 'Viscosity'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Bronsch, Arne. "Viscosity of slags." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-229196.

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Slags plays a significant role at high temperature processes. The estimation of the slag viscosity is vital for the safe run of e.g. entrained flow gasifiers. One opportunity of determination is rotational viscometry. This technique is disadvantageous in view of elevated temperatures, applied materials and the necessary time. Additionally, the viscosity can be predicted by the help of viscosity models, where viscosity is a function of slag composition and temperature. Due to changing slag properties within the technical processes, the calculated viscosities can hugely differ from measured ones

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2

Riesch, Christian. "Micromachined viscosity sensors." Aachen Shaker, 2009. http://d-nb.info/997162279/04.

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3

Bukula, Nwabisa Asanda. "Optimisation of clearcoat viscosity." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/4814.

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Modern automobiles are painted with basecoat, technology which is either metallic, solid colour or pearlescent. This requires protection from chemicals, scratching, weathering and UV light by applying a protective top coat (clearcoat) over the basecoat. For the clearcoat to cure into a hard protective shell it undergoes an irreversible crosslinking process. This usually takes place over the first four to five hours, depending on the formulation and weather conditions. The speed of crosslinking can be enhanced by temperature. Pot life is important as it can affect the overall quality of the pai

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4

Chan, Paul Wing Hung. "In-situ viscosity measurement." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341507.

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5

Campanelli, John R. "Interfacial viscosity and emulsion stability." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63776.

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6

Caudwell, Derek Roger. "Viscosity of dense fluid mixtures." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412706.

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7

Hunter, Ian Norman. "The viscosity of gaseous mixtures." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253386.

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8

Riesch, Christian [Verfasser]. "Micromachined Viscosity Sensors / Christian Riesch." Aachen : Shaker, 2009. http://d-nb.info/1159835438/34.

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9

Haberbusch, Diane. "Viscosity Regulation In Polymer Extrusion." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1386782032.

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10

Rothan, Alexandre. "Etude rhéologique de formulations thermodurcissables, pour la modélisation de procédés de type SMC." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE003/document.

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Les travaux présentés s’axent autour de 2 chapitres indépendants : - le 1er concerne l’étude rhéologique d’une formulation pour SMC sans fibres. Cette étude permet d’élaborer des lois de comportement rhéologique. Ces lois sont ensuite insérées dans un code de calcul de simulation numérique afin de prédire les efforts mis en jeu lors d’une compression. Ces données simulées sont comparées avec des données de compression obtenues expérimentalement. - le 2ème se penche sur l’étude d’un comportement rhéologique rare : la rhéopexie négative. La viscosité de l’échantillon dépend de l’histoire de cisa

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11

Pleines, Maximilian. "Viscosity-control and prediction of microemulsions." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS139.

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La viscosité est une propriété fondamentale des fluides complexes et qui reste encore difficile à prédire quantitativement. Cette propriété macroscopique provient de propriétés moléculaires et mésoscopiques. La compréhension et l’estimation de l'évolution de la viscosité avec des paramètres variables est important pour plusieurs applications, entre autres pour l’extraction liquide-liquide et pour la formulation de systèmes tensioactifs aqueux.Dans ce travail, un modèle "minimal" prenant en compte les énergies libres mises en jeu a été développé pour aider à comprendre, contrôler et prédire l'é

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12

Loebker, David W. "Effervescent spraying of high viscosity fluids." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/7041.

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13

Almotari, Masaed Moti M. "Viscosity and Density of Reference Fluid." Thesis, University of Canterbury. Physics and Astronomy, 2006. http://hdl.handle.net/10092/2065.

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The viscosity and density of bis(8-methylnonyl) benzene-1,2- dicarboxylate {diisodecyl phthalate (DIDP)}, with a nominal viscosity at T = 298 K and p = 0.1 MPa of 87 mPa•s, have been measured at temperatures from (298.15 to 423.15) K and pressures from (0.1 to 70) MPa. A vibrating wire viscometer, with a wire diameter of about 0.15 mm, was utilised for the viscosity measurements and the results have an expanded uncertainty, (k = 2), including the error arising from the pressure measurement, of between ±(2 and 2.5) % The density was determined with two vibrating tube densimeters one for operati

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14

Huang, Jin. "Extensional viscosity of dilute polymer solutions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0004/MQ46075.pdf.

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15

Lu, Egang. "Bulk viscosity of a pion gas." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104847.

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In this thesis, we study kinetic theory and chiral perturbation theory, which are employed to compute the bulk viscosity of a gas of pions at temperatures below the QCD crossover temperature, for the physical value of m, to lowest order in chiral perturbation theory. Bulk viscosity is controlled by number-changing processes which become exponentially slow at low temperatures when the pions become exponentially dilute, leading to an exponentially large bulk viscosity ζ ∼ (F^8/m^5)*exp(2m/ T), where F ≃ 93 MeV is the pion decay constant.<br>La théorie cinématique des particules et la théorie per

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16

Fan, Jingyun. "Lubricating properties of PMA viscosity modifiers." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445329.

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17

Caswell, Robert J. "Viscosity effects in small diameter hydrocyclones." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278416.

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18

Glen, N. F. "Viscosity coefficient measurement at elevated pressure." Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372405.

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19

Marchant-Lane, Sophie. "Low viscosity nematics : design of dopants." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434117.

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20

GAMA, MARCIA SOARES. "VISCOSITY OF HEAVY FRACTIONS OF OIL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9312@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>Os processos de destilação atmosférica e a vácuo do petróleo têm como sub-produtos mais pesados os resíduos atmosféricos e de vácuo, respectivamente. Modelos encontrados na literatura não descrevem bem a dependência da viscosidade com a temperatura para estas frações. Há grandes diferenças entre valores experimentais e calculados e no comportamento da curva temperatura X viscosidade. As viscosidades dinâmicas de sete diferentes amostras de resíduos foram determinadas experimentalmente. As amostras foram caracterizadas através de ens

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21

Al-Awadi, Hameed. "Multiphase characteristics of high viscosity oil." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/13902.

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Heavy oil production has drawn more and more attention in petroleum industry. The amount of heavy oil in the world is twice more than the conventional oil (low viscosity), which has been consumed rapidly from the past. The understanding of flow patterns and pressure losses in multiphase flow with high viscosity oil are vital to assist the design of transportation pipeline. This thesis involves experimental investigation of two phase and three phase flows under high oil viscosity conditions (up to 17000cP) in horizontal pipelines. The multiphase (oil/water/solid/gas) facility was designed and c

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22

Villeneuve, Randall A. (Randall Alan). "Effects of viscosity on hydrofoil cavitation." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/17325.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.<br>Includes bibliographical references (leaves 118-120).<br>by Randall A. Villeneuve.<br>M.S.

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23

Liu, Weian, Yin Yang, and Gang Lu. "Viscosity solutions of fully nonlinear parabolic systems." Universität Potsdam, 2002. http://opus.kobv.de/ubp/volltexte/2008/2621/.

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In this paper, we discuss the viscosity solutions of the weakly coupled systems of fully nonlinear second order degenerate parabolic equations and their Cauchy-Dirichlet problem. We prove the existence, uniqueness and continuity of viscosity solution by combining Perron's method with the technique of coupled solutions. The results here generalize those in [2] and [3].

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24

Touhami, Youssef. "Effects of viscosity on dynamic interfacial tension." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5607.

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In this study, we have investigated the interfacial tension (IFT)-lowering potential of a range of caustic solutions which were contacted with dilute solution of linoleic acid in light paraffin oil. Two polymers, namely, polyvinyl alcohol and polyacrylamide were added to the caustic solution in order to increase bulk phase viscosity. The dynamic IFT of caustic, polymer and caustic-polymer solutions were measured. By using different linoleic acid concentrations up to 100 mM, it was found that an increase in acid concentration was accompanied by a decrease in IFT for any given caustic compositio

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25

Chan, Wendy Wing Yan. "Effect of viscosity on biofilm phenotypic expression." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0015/MQ49603.pdf.

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26

Burns, Kirstin Anne. "The effective viscosity of ash-laden flows." CONNECT TO THIS TITLE ONLINE, 2007. http://etd.lib.umt.edu/theses/available/etd-05142007-114642/.

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27

Mihaiescu, Adrian N. "Eddy viscosity turbulence models for compressible mixing." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/7982.

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The K - L and K - ϵ turbulence models are used to simulate the turbulent mixing induced by the Rayleigh-Taylor and Richtmyer-Meshkov instabilities. The models contain additional source terms for the turbulence kinetic energy which depend on the type of the instability. A new criterion based on ratio of the averaged flow and turbulence time scales is introduced for differentiating between the two types of instabilities. The original formulation of the turbulence kinetic energy source present in the K - ϵ model is modified in order to accurately capture the evolution of the Richtmyer-Meshkov in

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28

Padrel, de Oliveira Carla Maria Bispo. "Viscosity of liquid hydrocarbons at high pressure." Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402965.

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29

Wen, Chien-Hui. "High Birefringence and Low Viscosity Liquid Crystals." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3206.

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In this dissertation, liquid crystal (LC) materials and devices are investigated in order to meet the challenges for photonics and displays applications. We have studied three kinds of liquid crystal materials: positive dielectric anisotropic LCs, negative dielectric anisotropic LCs, and dual- frequency LCs. For the positive dielectric anisotropic LCs, we have developed some high birefringence isothiocyanato tolane LC compounds with birefringence ~0.4, and super high birefringence isothiocyanato biphenyl-bistolane LC compounds with birefringence as high as ~0.7. Moreover, we have studied the p

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30

Sansom, Ahmos. "Spreading gravity currents with temperature-dependent viscosity." Thesis, University of Nottingham, 2000. http://eprints.nottingham.ac.uk/14140/.

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The spreading of a fluid under gravity has many important industrial and geophysical applications and has been the focus of much research. Variations in the thermal properties of the fluid have often been neglected. This thesis introduces a series of models incorporating fluids having temperature-dependent viscosity and vertical cross-sectional profile of small aspect ratio to show the important effects that cooling can have on the flow field. The numerical results show features that are commonly observed in experiment and lava dome growth, such as plateauing and fingering.

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31

Dandekar, Abhijit Yeshwant. "Interfacial tension and viscosity of reservoir fluids." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1397.

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32

Cook, David J. "The effects of viscosity on flavour perception." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289066.

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33

Hewett, Kylie. "The viscosity behaviour of polymethacrylates in solution." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333562.

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34

Elmes, D. R. "Creep and viscosity in two kaolin clays." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372627.

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35

Sherwood, J. M. "Blood velocity and viscosity in bifurcating microchannels." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1400720/.

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Blood is a complex fluid comprised of predominantly red blood cells (RBCs) suspended in a continuous, Newtonian phase, the plasma. Blood viscosity is highly dependent on the RBC concentration (haematocrit) and also displays shear thinning properties, as a result of RBC deformation and aggregation at high and low shear rates, respectively. However, these two phenomena also lead to uneven haematocrit distributions, which are exacerbated in microvascular bifurcations. In the present study, multifaceted experiments of human blood, perfused through bifurcating microchannels, are used to further elu

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36

Mohammed, Malami. "Viscosity and density of asymmetric hydrocarbon mixtures." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/42783.

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The main focus of this research has been on providing useful experimental viscosity and density data on some representative asymmetric hydrocarbon mixtures with particular interest on mixtures of higher-molecular-weight aliphatic hydrocarbons with dissolved methane. This thesis details incremental improvements in the design and operation of an existing vibrating-wire viscometer-densimeter (VWVD). These improvements were necessary in order to allow safe investigations of viscosity of highly flammable mixtures such as methane + n-hexadecane. The procedure for absolute viscosity measurement using

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37

Tshehla, Maashutha Samuel. "Two dimensional flow of variable viscosity fluids." Doctoral thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/4936.

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38

Lloyd, Wennie Lim. "Viscosity and lyophoresis of comminuted tomato products /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487263399025573.

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39

Patel, Vijay. "Studies of magnetic viscosity in anisotropic materials." Thesis, Keele University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261526.

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40

Holtzinger, Jennifer. "Influence of viscosity modifiers on hydrodynamic friction." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/10222.

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Polymer additives, named Viscosity Modifiers (VMs), have been added to motor engine lubricants for more than 50 years, where they are used to increase the viscosity index of their blends. It is well known that solutions of VMs exhibit shear thinning under high strain rate conditions as are present in engine journal bearings. In the past, this shear thinning was regarded as undesirable since it might reduce hydrodynamic film thickness. However it has been reported that multigrade oils containing VMs provide lower engine friction than polymer-free oils of comparable viscosity and the most likely

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41

Miller, James. "Modelling melt viscosity for nuclear waste glass." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/9110/.

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This work forms part of a Collaborative Awards in Science and Engineering industrial studentship (iCASE), jointly funded by the Engineering and Physical Sciences Research Council and the National Nuclear Laboratory. The aim is to develop improved models for calculating viscosities of vitreous nuclear waste melts, particularly with respect to the variation in temperature and composition. Both in vitro and in situ experimentation on nuclear material is complicated by radioactivity and its associated expenses, so computational modelling is the principal means we use to study these industrially im

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42

Benlahmar, Ouidad. "Dispersant viscosity improvers for lubricating oil compositions." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/34518.

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Dispersant viscosity modifiers (DVMs) are multi-functional lubricant additives combining in one additive composition, dispersancy and the ability to improve the viscosity of a lubricant, at high engine temperatures, sufficiently to maintain efficient lubrication. Compounds useful for this purpose are characterized by a polar group attached to a relatively high molecular weight hydrocarbon chain. Polymeric compounds that were studied for possible use as DVMs were maleated ethylene–propylene copolymers and copolymers containing an alkyl methacrylate and vinyl amine-containing monomers. The curre

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43

Khaleque, Tania Sharmin. "Strongly variable viscosity flows in mantle convection." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:851f7069-8164-4499-8afa-5a06141c5911.

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Convection in the Earth's mantle is a complicated phenomenon that causes various tectonic activities and affects mantle evolution on geologic time scales (billions of years). It is a subject as yet not fully understood. The early success of the high Rayleigh number constant viscosity theory was later tempered by the absence of plate motion when the viscosity is more realistically strongly temperature dependent. A similar problem arises if the equally strong pressure dependence of viscosity is considered, since the classical isothermal core convection theory would then imply a strongly variable

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44

Reid, Joshua. "Angelic Viscosity: Dali and Dante in Paradise." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/2864.

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45

Kulchanyavivat, Sawin. "The effective approach for predicting viscosity of saturated and undersaturated reservoir oil." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3168.

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Predicting reservoir oil viscosity with numerical correlation equations using field-measured variables is widely used in the petroleum industry. Most published correlation equations, however, have never profoundly realized the genuine relationship between the reservoir oil viscosity and other field-measured parameters. Using the proposed systematic strategy is an effective solution for achieving a high performance correlation equation of reservoir oil viscosity. The proposed strategy begins with creating a large database of pressure-volumetemperature (PVT) reports and screening all possible er

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46

Isasa, Jean-David. "Optimisation des propriétés diélectriques de copolymères à base de PVDF : étude de la formulation d’encres et optimisation de procédés d’impression." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0026.

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Les polymères fluorés fortement polaires tels que le P(VDF-TrFE) sont des matériaux émer-gents dans le domaine de l'électronique organique flexible en raison de leurs nombreuses appli-cations en tant qu'actionneurs, capteurs ou récupérateurs d'énergie. En raison de la forte polarité des liaisons C-F, une orientation dipolaire coopérative dans les domaines cristallins peut être in-duite et est principalement responsable des propriétés électroactives de ces polymères. Le dépôt de ces matériaux en films minces peut être réalisé par impression ou déposition par voie liquide, offrant une méthode de

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47

Wu, Liushun. "Study on some phenomena of slag in steelmaking process." Doctoral thesis, KTH, Mikro-modellering, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32740.

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The present work is to study slag phenomena in steelmaking process. In order to attain thegoal, a number of high temperature experiments and simulation experiments were carried out. Four master slags were used to study the effect of CaF2 on slag viscosity. Experimentalresults indicated the effect of CaF2 on slag viscosity depended strongly on the composition ofmaster slag. For high basicity slags, CaF2 mainly suppressed the precipitation of solid phasesat lower temperatures, leading to a lower viscosity compared to CaF2-free slags. For slagswith higher SiO2 contents, CaF2 both lowered the visc

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48

Kondratiev, Alex. "Development of viscosity models for multiphase slag system /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18306.pdf.

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49

Meller, Mika. "Dispersive mixing of high viscosity ratio polymer blends /." Lausanne, 2000. http://library.epfl.ch/theses/?nr=2267.

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50

Viscardy, Sébastien. "Viscosity and microscopic chaos: the Helfand-moment approach." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210964.

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<p align="justify"><p>Depuis les premiers développements de la physique statistique réalisés au 19ème siècle, nombreux ont été les travaux dédiés à la relation entre les processus macroscopiques em>irréversibles</em>(tels que les phénomènes de transport) et les propriétés de la dynamique <em>réversible</em> des atomes et des molécules. Depuis deux décennies, l'<em>hypothèse du chaos microscopique</em> nous en apporte une plus grande compréhension. Dans cette thèse, nous nous intéressons plus particulièrement aux propriétés de <em>viscosité</em>. <br /><br /><p><p>Dans ce travail, nous considér

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