Thèses sur le sujet « Liquid film model »
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Hantsch, Andreas. « A lattice Boltzmann equation model for thermal liquid film flow ». Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-130098.
Texte intégralFlüssigkeitsfilmströmungen kommen in vielen verfahrenstechnischen Prozessen zum Einsatz. Zur Unterstützung von Experimenten sind theoretische und numerische Untersuchungen nötig. Stand der Technik ist es, Navier--Stokes-basierte Modelle zu verwenden, wohingegen hier die Lattice-Boltzmann-Methode verwendet wird. Das finale Modell wurde unter Verwendung eines Zweiphasen- und eines Wärmeübertragungsmodell entwickelt und geeignete Rand- und Anfangsbedingungen formuliert. Alle Untermodelle wurden anhand einfacher Testfälle überprüft. Es konnte herausgefunden werden, dass das Zweiphasenmodell Strömungen großer Dichteunterschiede rechnen kann, was eindrucksvoll im Zusammenhang mit Wandrandbedingungen gezeigt wurde. Das Wärmeübertragungsmodell wurde gegen eine Spektrallösung anhand eines transienten und nichtuniformen Strömungsproblemes getestet. Stationäre Filmströmungen zeigten sehr gute Übereinstimmungen mit OpenFOAM-Lösungen und instationäre Berechungen bewiesen, dass das Model auch solche Strömungen abbilden kann
Hantsch, Andreas [Verfasser], Ulrich [Akademischer Betreuer] Groß, Ulrich [Akademischer Betreuer] Groß et Rüdiger [Akademischer Betreuer] Schwarze. « A lattice Boltzmann equation model for thermal liquid film flow / Andreas Hantsch. Gutachter : Ulrich Groß ; Rüdiger Schwarze. Betreuer : Ulrich Groß ». Freiberg : Technische Universität Bergakademie Freiberg Universitätsbibliothek "Georgius Agricola", 2013. http://d-nb.info/105809503X/34.
Texte intégralHu, Chih-Chieh. « Mechanistic modeling of evaporating thin liquid film instability on a bwr fuel rod with parallel and cross vapor flow ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28148.
Texte intégralCommittee Chair: Abdel-Khalik, Said; Committee Member: Ammar, Mostafa H.; Committee Member: Ghiaasiaan, S. Mostafa; Committee Member: Hertel, Nolan E.; Committee Member: Liu, Yingjie.
Хоменко, Олексій Віталійович, Алексей Витальевич Хоменко, Oleksii Vitaliiovych Khomenko, B. N. J. Persson, М. А. Khomenko et S. V. Rudenko. « Synergetic model of frictional softening of ice surface layer ». Thesis, Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна Національної академії наук України, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41630.
Texte intégralAntariksawan, Anhar Riza. « Interaction thermique acier inoxydable fondu-eau sur l'installation SEIZIES : analyse et interprétation ». Grenoble INPG, 1993. http://www.theses.fr/1993INPG0038.
Texte intégralKurz, Günter. « Hydrodynamics of defects in nematic liquid crystal films ». Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313591.
Texte intégralBribesh, Fathi. « Free surface films of binary liquid mixtures ». Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/9810.
Texte intégralKitavtsev, Georgy. « Derivation, analysis and numerics of reduced ODE models describing coarsening dynamics of liquid droplets ». Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2010. http://dx.doi.org/10.18452/16069.
Texte intégralIn this dissertation the topic of reduced ODE models corresponding to a family of one-dimensional lubrication equations derived by Muench et al. 06'' is addressed. This family describes the dewetting process of nanoscopic thin liquid films on hydrophobic polymer substrates due to the presence of several intermolecular forces and takes account of different ranges of slip-lengths at the polymer substrate interface. Reduced ODE models derived from underlying lubrication equations allow for an efficient analytical and numerical investigation of the latest stage of the dewetting process: coarsening dynamics of the remaining droplets. We first give an asymptotical derivation of these models and use them to investigate the influence of slip-length on the coarsening dynamics. In the second part of the talk we present a new geometric approach which can be used for an alternative derivation and justification of above reduced ODE models and is based on a center-manifold reduction recently applied by Mielke and Zelik 08'' to a certain class of semilinear parabolic equations. One of the main problems for a rigorous justification of this approach is investigation of the spectrum of a lubrication equation linearized at the stationary solution, which describes physically a single droplet. The corresponding eigenvalue problem turns out to be a singularly perturbed one with respect to a small parameter epsilon tending to zero. For this problem we show existence of an epsilon-dependent spectral gap between a unique exponentially small eigenvalue and the rest of the spectrum.
Celle, Pierre. « Couplages fluide / milieu poreux en grandes déformations pour la modélisation des procédés d'élaboration par infusion ». Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2006. http://tel.archives-ouvertes.fr/tel-00741260.
Texte intégralHinsberg, Nils Paul van. « Investigation of drop and spray impingement on a thin liquid layer accounting for the wall film topology ». Aachen Shaker, 2009. http://d-nb.info/1000840115/04.
Texte intégralBjurström, Johan. « Advanced Thin Film Electroacoustic Devices ». Doctoral thesis, Uppsala universitet, Fasta tillståndets elektronik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7672.
Texte intégralMendez, Miguel Alfonso. « Dynamics of Gas Jet Impinging on Falling Liquid Films ». Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/281945/5/contratMM.pdf.
Texte intégralDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Stöckle, Silke. « Thin liquid films with nanoparticles and rod-like ions as models for nanofluidics ». Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2010/4637/.
Texte intégralMit dem Heranwachsen der Nanotechnologie in den vergangenen zehn Jahren hat sich die Nanofluidik als Forschungsbereich etabliert und erfährt wachsende Aufmerksamkeit in der Wissenschaft, sowie auch in der Industrie. Im biomedizinischen Bereich, wo intrazelluläre Prozesse häufig komplexer, nanofluidischer Natur sind, wird sich vermehrt für ein detailliertes Verständnis von nanofluidischen Prozessen interessiert, z.B. für den Einfluss von Kolloiden verschiedenster Form oder elektrischer Ladung auf die Kanäle und auf das Fließverhalten oder die Auswirkungen der Einengung von Flüssigkeiten und Kolloiden in Nanometer Geometrien. In der vorliegenden Arbeit werden dünne flüssige Filme, hinsichtlich ihrer Funktion als nanofluidische Modelle untersucht. Im ersten Teil der Arbeit wurde die Fließgeschwindigkeit des Fluids aus dem dünnen Film, abhängig von der Konzentration der filmstabilisierenden Tensidmoleküle n – Dodecyl β – D – Maltoside ( β – C₁₂G₂) bei einer konstanten Elektrolytkonzentration von 0.2 mM NaCl untersucht. Mit einem theoretischen Modell konnte das Dünnungsverhalten nachgezeichnet werden. Es wurde eine kritische Tensidkonzentration gefunden, unter der die Oberflächen lateral mobil sind und über der sie sich wie fest verhalten. Dadurch konnten wir Aufschluss darüber erlangen, wie die Oberfläche des Films unter verschiedenen Bedingungen geschaffen ist, und das in Bezug zur Verteilungsdichte der Moleküle an den Oberflächen setzen. Im weiteren wurden komplexere, nanofluidische Systeme untersucht, wobei zum einen ~ 1 nm lange, stäbchenförmige, multivalent geladene Spermidin - Moleküle die punktförmigen Elektrolyte ersetzten. Es konnte eine deutliche Veränderung der Stabilität zwischen Filmen mit und ohne Stäbchen festgestellt werden. Die Filme, mit NaCl, blieben länger in dem metastabilen „Common Film“ (CF) Zustand als die Filme, die eine vergleichbare Konzentration von Spermidin Stäbchen beinhalteten. Die Ergebnisse deuteten auf eine zusätzliche Anziehungskraft durch Brückenbildung zwischen zwei geladenen Oberflächen durch gegensätzlich geladene Stäbchenförmige Moleküle hin. Es konnte gezeigt werden, dass dieser Effekt weder ein Ergebnis von spezifischer Ionenadsorption an die Filmoberfläche war, noch ein Unterschied in den Gleichgewichtszuständen von den Dicken der CFs und der Newton Black Films (NBFs) hervorrief, was auf die korrekte Annahme der Ionenstärke in der Lösung schließen ließ. Auch in Versuchen mit ebenfalls trivalenten Ionen YCl3 wurde festgestellt, dass kein vergleichbarer Überbrückungseffekt auftritt. Die Ergebnisse wurden mit theoretischen Simulationen verglichen und es wurde eine quantitative Übereinstimmung gefunden bezüglich der Größe des Systeminternen Energiegewinns durch den Überbrückungseffekt. Desweiteren wurde das Fließverhalten von Fluiden mit Kolloiden eingeengt in Nanometer Geometrien untersucht. Für zwei verschiedene Arten von Nanopartikeln (Fe3O4 stabilisiert mit Oleinsäure und polymerstabilisierte Goldpartikel) wurde eine Verlangsamung der Fließgeschwindigkeit festgestellt. Mit einem theoretischen Modell konnte das Fließverhalten nur für enorm erhöhte Viskositätswerte des Fluids erklärt werden. Die Viskositätserhöhung wurde mit Partikelaggregaten, die den Ausfluss behindern, erklärt und diskutiert, unter der Annahme eines nicht - Newtonischen Fließverhaltens der Dispersionen. Gleichermaßen wurde die strukturelle Anordnung der Partikel in den Filmen hinsichtlich ihrer vertikalen und lateralen Verteilung untersucht. In dieser Arbeit werden vorläufige Ergebnisse präsentiert, die noch weiteren Studien bedürfen. Mit Neutronenreflexion sollte die Anordnung der Partikel orthogonal zur Oberfläche im Film analysiert werden. Eine qualitative Analyse lässt schließen, dass bei einer höheren Konzentration von Partikeln in Lösung, sich auch eine erhöhte Konzentration von Partikeln im dünnen Film befindet. Leider konnten die Daten nicht hinsichtlich der Lage der Partikel analysiert werden. Zum ersten Mal wurden dünne flüssige Filme mit Kleinwinkelröntgenstreuung unter streifendem Einfall (GISAXS) analysiert. Mit Hilfe dieser Methode sollte eine laterale Anordnung der Partikel im Film untersucht werden. Es konnten erfolgreiche Messungen durchgeführt werden und mit Hilfe der rechnergestützten Analyse konnte eine Aussage gemacht werden, dass ~ 6 nm große Teilchen in ~ 43 nm Abstand sich im Film befinden. Die Aussage bezüglich der kleinen Teilchen könnte sich auf einzelne, kleinere Partikel beziehen, allerdings könnten auch die 43 nm eine relevante Strukturgröße darstellen, da es in der Dispersion gehäuft Aggregate mit dem Durchmesser in dem Größenbereich vorliegen. Zusammenfassend können sich mit dieser Arbeit die dünnen flüssigen Filme als eine wichtige Kernmethode der Untersuchung von nanofluidischen Prozessen, wie sie häufig in der Natur vorkommen, behaupten.
Healy, William M. « Modeling the impact of a liquid droplet on a solid surface ». Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16737.
Texte intégralКостюченко, Євген Володимирович, Евгений Владимирович Костюченко et Yevhen Volodymyrovych Kostiuchenko. « Концентрування водних розчинів малолетких рідин в плівковому апараті з протоком нейтрального газу ». Thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/86295.
Texte intégralThe thesis is devoted to the study of the regularities of the process of concentration of aqueous solutions of some low–volatile liquids in a flowing diaper by evaporation into a cross flow of neutral gas and the use of the results to create a new kind of the concentrator. Such kind of a concentrator makes possible vacuum–free concentration of solutions at temperatures below their boiling point, which, due to the high boiling points of volatile liquids, helps to reduce energy consumption and to avoid the scarce types of fuel used while heating the solution. The thesis presents the results of modeling the hydrodynamics and heat and mass transferring of a flowing film of an individual (of one component) liquid evaporating into a cross flow of a neutral gas using the created mathematical model. The results demonstrate the regularities of changes in the thickness, flow rate and temperature of the film along its length, as well as the temperature of the gas above the film. It was found that the intensity of evaporation of liquid from the film during its cross–interaction with the gas flow is higher than during direct–flow interaction and can exceed the rate of evaporation during counter current interaction. The temperature of a liquid film evaporating into a cross flow of a neutral gas, with distance from its initial cross section, reaches an equilibrium value, and with a further increasing the distance from this section, the liquid evaporates completely. There has been developed an algorithm for calculating the distances at which these phenomena appear. The temperature of the gas above the film along the length of the film changes insignificantly, but by its natural characteristics this change is associated with the temperature of the film and reaches an equilibrium value, in addition. On the basis of an experimental study of heat and mass transfer in a flowing film of water evaporating into a cross flow of air, the values of the heat transfer coefficient from the surface to the film flowing along it, as well as the coefficients of heat and mass transfer from the film to the air flow, have been established. The dependence of these coefficients on the parameters of the heat and mass transfer process showed the presence of a transition from the laminar mode of film flow to the turbulent one at the value of the number 𝑅𝑒ж≈500. Mathematical processing of the experimental data made it possible to obtain empirical equations for calculating the heat and mass transfer coefficients. The obtained results of mathematical modeling and experimental study of the evaporation of an individual liquid from its flowing down film became the basis for the development of a mathematical model and study of the process of concentration of aqueous solutions of some low–volatile liquids in a flowing film by evaporation into a cross flow of neutral gas. Using this model, the regularities of changes in the composition of the solution along the length of the film and the intensity of the concentration process were established. It is shown that the concentration of the solution at the beginning of the film changes linearly, then there is a abrupt rise, continuing until the complete evaporation of water. This kind of a change in the concentration of the solution along the length of the film is associated with the temperature distribution of the film. The abrupt rise of concentration corresponds to the state temperature value. An experimental study of the process of concentration of aqueous solutions of glycerin in their flowing film in the conditions of evaporation into an air stream was carried out, as a result of which the heat and mass transfer coefficients were determined, which are the parameters of the developed mathematical model. It was found that, in the investigated range of variation of the process parameters, for low–concentration solutions of glycerol, as well as for water, it is common to observe the transition from a laminar mode of film flow to a turbulent one, for solutions with an increased concentration of glycerol, such a transition is absent and the film flows down only in a laminar mode. The thesis presents experimental data on a decrease in the width of a liquid film flowing down a heated flat surface, associated with capillary effects. For water and aqueous solutions of glycerin, such a change in the width of the film can reach 50-80%. The natural characteristic of the change in the width of the film along its length and the obtained empirical dependences for its assessment are established. On the basis of the results obtained in the thesis, the study of the process of concentrating aqueous solutions of some low–volatile liquids, a new design and method for calculating a film concentrator have been developed. The design is based on the use of a plane–parallel (lamellar) packing, which makes possible a cross–flow interaction. The elements (plates) of the packing have internal cavities through which the coolant passes, heating the solution film flowing down their outer surface. The calculation technique was tested on specific parameters of the concentration process.
Vezzoli, Massimiliano. « Intrinsic kinetics of titania photocatalysis : simplified models for their investigation ». Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/51574/1/Massimiliano_Vezzoli_Thesis.pdf.
Texte intégralMendonça, Carlos Miguel Nóbrega. « Interactions between ionic liquids and cell membrane models ». Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13836.
Texte intégralThis work proposes the study of the interactions, at a molecular level, between diverse ionic liquids (ILs) and the membrane cells, by applying membrane cell models, namely Langmuir-Blodgett technique. We intend to establish a better understanding about the role of the interactions of ILs with membrane cells, in specific, the imidazolium and choliniumcholinium families. Hence, we propose the evaluation of the effect of the concentration as well as of the alkyl chain lengths of imidazolium ILs, on the lipid monolayers organization and stability and compare it with the behaviour of choliniumcholinium ILs. Summing up, this work is expected to provide an insight into the molecular mechanism contributing to the IL toxic activity that should help in the design of less toxic ILs.
Este trabalho propõe o estudo das interações, ao nível molecular, entre diversos líquidos iónicos (ILs) e membranas celulares mediante a aplicação de modelos de membrana celular segundo a técnica de Langmuir Blodgett. Pretendemos estabelecer uma melhor compreensão sobre o papel fundamental das interações de ILs com as membranas celulares, em particular os ILs da família imidazólio e colina. Assim, propõe-se a avaliação do efeito da concentração, bem como dos comprimentos da cadeia alquílica de ILs da família imidazólio, na organização e estabilidade de monocamadas lipídicas e a comparação com o comportamento de líquidos iónicos da família das Colinas. Em suma, este trabalho pretende fornecer uma visão sobre os factores moleculares que contribuem para a toxicidade dos ILs, que possam ajudar no desenvolvimento de ILs menos tóxicos.
Sommer, Oliver. « Ein Beitrag zur Untersuchung des Verhaltens dünner Flüssigkeitsfilme nahe gekrümmten Substratoberflächen ». Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-154946.
Texte intégralIn this study the behaviour of a thin liquid layer at a curved solid edge was examined by experimental coating investigations based on the laser-induced fluorescence technique and by numerical film simulations based on the Volume-of-Fluid multiphase flow model, respectively. The main motivation was to find optimal combinations of influencing quantities to reduce the fat-edge effect. Therefore a study of these quantities was performed, in which application parameters like edge radii of curvature and application layer thicknesses as well as determining liquid properties like viscosity and surface tension have been varied. Results are described qualitatively at corresponding fat-edge shapes and quantified by suitable fat-edge parameters, which had to be identified and selected. It could be shown that adverse and appropriate influencing parameter combinations exist, which generate conspicuous and less distinctive fat-edges, respectively - especially in laboratory experiments. The experimental findings and proportionalities regarding fat-edge shapes and dimensions are found to be physically plausible. Furthermore an order of significance of the influencing quantities established. Eventually, a dimensionless quantity was derived by dimensional analysis, which describes the fat-edge effect. Thus, the fat-edge effect has also been described by the application of similarity theory and the corresponding dimenionless number, respectively
Ellgren, Alex. « Analysis of vortex movement in an YBCO thin film : Models of the vortex solid-to-liquid transition compared to a sensitive resistive measurement of a strongly pinned YBCO thin film ». Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140589.
Texte intégralGalluzzi, M. « INTERFACIAL PROPERTIES OF IONIC LIQUIDS:ELECTRIC PROPERTIES OF THIN FILMS AND INTERACTION WITH MODEL MEMBRANES AND LIVING CELLS ». Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/229734.
Texte intégralChovet, Rogelio. « Caractérisation expérimentale et numérique du comportement rhéologique d'un fluide complexe : application à une mousse en écoulement dans un canal horizontal droit avec et sans singularités ». Thesis, Valenciennes, 2015. http://www.theses.fr/2015VALE0021/document.
Texte intégralThis work is an experimental and numerical study of aqueous foam flow inside a horizontal square duct, with and without flow disruption devices (fdd). It is especially devoted to determine the pertinent parameters of the flow: longitudinal pressure losses, velocity fields of foam flow near the walls, liquid film thickness (thick and thin), and the wall shear stress evolution, for an aqueous foam with a void fraction range between 55 and 85%, for a mean foam flow velocity of 2, 4 and 6 cm/s. Once they were determined, inside the horizontal channel, we carried out measurements over different geometries: half-sudden expansion, vertical fence and foam flow around a cylinder. The goal was to study the foam flow reorganization to well understand the rheological behavior of aqueous foam flow in the vicinities of different fdd. Finally, a numerical simulation (CFD), using the Bingham behavior model of non-Newtonian fluid, was undertaken to test its capacity to represent the aqueous foam flow inside the horizontal duct with flow disruption devices. First of all, we verified the static longitudinal pressure evolution, which varies linearly upstream and downstream far from the fdd. The singular pressure loss remains constant for a given mean foam velocity and a foam quality (void fraction). From the Particle Imaging Velocimetry (PIV) technique (2D), we determined the two velocity components in the immediate vicinities of the disruption devices. They allowed us to put into evidence the different foam flow regimes and to observe the foam flow reorganization and rheological behavior through the studied fdd. The slip-layer thickness analysis, obtained using the conductimetry method, shows that the wall presents a liquid film thick enough to apply an electrochemical technique (polarography). Thus, the polarographic signals, obtained for the foam flow, present important fluctuations. They were compared to the wall shear stress deducted from the measurement of pressure losses, showing a good similarity between them. The numerical study (CFD), carried out for aqueous foam flow with a void fraction of 70% and a mean foam flow velocity of 2 cm/s, shows that the Bingham rheological model can be adapted to this kind of aqueous foam flow which is flowing like a block
Misguich, Grégoire. « Modele d'echange multiple sur le reseau triangulaire : liquide de spins quantiques en deux dimensions et magnetisme des films d'helium-3 solide ». Paris 6, 1999. http://www.theses.fr/1999PA066347.
Texte intégralEven, Catherine. « Vibrations d'une membrane smectique : rôle de la forme du contour ». Phd thesis, Université Paris Sud - Paris XI, 1999. http://tel.archives-ouvertes.fr/tel-00006615.
Texte intégralDouysset, Laurence. « Etude de couches minces monocristallines élaborées par épitaxie en phase liquide pour applications laser dans le visible : croissance et caractérisation de couches de LiYF4 dopé terres rares ». Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10048.
Texte intégralGIUSTI, ANDREA. « Development of numerical tools for the analysis of advanced airblast injection systems for lean burn aero-engine combustors ». Doctoral thesis, 2014. http://hdl.handle.net/2158/867029.
Texte intégralStöckle, Silke [Verfasser]. « Thin liquid films with nanoparticles and rod-like ions as models for nanofluidics / von Silke Stöckle ». 2010. http://d-nb.info/1009216023/34.
Texte intégralHuang, Shang Ning, et 黃祥寧. « Monte-Carlo computer simulation of a coupled XY modle : A study of the phase transition of free- standing liquid crystal films ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/25610705773502199581.
Texte intégral國立中山大學
物理研究所
81
We investigate the Smectic-A → Hexatic-B phase transition on free-standing liquid crystal films of two-molecular layers theoretically in this study. The Bruinsma and Aeppli model in two dimension is studied with two coupled XY models which are corresponding to bond orientation order and herring-bone order, respectively. Through thouroughly Monte Carlo simula- tions, we find that the system can simultaneously establish the order of two parameters in a continuous transition and the heat-capacity anomaly is a sharp peak with critical exponent α, which is 0.39 approxi- mately. This result is close to that of the Smectic-A→ Hexatic-B phase transition experiment of two -mole- cular-layer free-standing liquid crystal films con- ducted by C. C. Huang et al..Experimently, they find that the Smectic-A → Hexatic-B phase transition of two-layer nmOBC liquid crystal films is chracterized by a novel heat-capacity peak with critical exponent α= 0.30±0.05.
Shunze, Zhang. « Channel governance of chinese liquor firm : the case of Sichuan Luzhou Laojiao ». Doctoral thesis, 2016. http://hdl.handle.net/10071/12447.
Texte intégralChannel governance is an important research topic in marketing. Both channel governance and control mechanisms will directly influence the behavior of channel members, and thus will affect the outcomes of channel governance. With the transformation of Chinese economy, people's ideology also will change. The effectiveness of traditional unilateral incentives, monitoring and enforcement mechanisms from one channel members against another is also being challenged, while the bilateral incentives, monitoring and enforcement mechanisms based on both parties have been paid more and more attention by channel members. In addition, as the impact of interdependence between channel members on the outcomes of channel governance is slowly perceived by scholars and validated with the resulting data, channel members are more inclined to reduce dependence on counterparties. Recently, Chinese liquor manufacturers represented by Luzhou Laojiao have embarked on innovative channel mode to resolve the conflict between channel members, and thus improve coordination between channel members. All these phenomena indicate that the mechanisms and instruments of channel governance are constantly extended in the channel governance practice. However, the effectiveness of these mechanisms and instruments on the governance outcomes has not been fully investigated, and the impact of the channel mode, the degree of interdependence between the manufacturers and distributors and other such factors on the relationship between channel governance mechanisms and governance outcomes also needs further clarification. This thesis takes Luzhou Laojiao and its distributors system for the studying the following three issues. First, we simultaneously include unilateral and bilateral channel governance mechanisms in the framework of channel governance to study the impact of the six channel governance mechanisms (unilateral and bilateral incentive, monitoring and enforcement) on the outcomes of channel governance. Second, based on the findings of existing literature, the relative dependence between manufacturers and distributors will also affect the outcomes of channel governance and will also moderate the relationship between specific channel governance mechanisms and the corresponding governance outcomes. Therefore, this thesis also studies the impact of such relative dependence between manufacturers and distributors on the outcomes of channel governance in Luzhou Laojiao and the moderating role of such interdependence on the relationship between channel governance mechanisms and outcomes investigated. Third, there are two typical channel modes in Luzhou Laojiao. One is traditional channel model and the other is innovative mode - QIQUAN model. The QIQUAN channel mode is significantly different from the traditional channel model in management, administration, operations and profits sharing, and in turn will have an impact on the outcomes of channel governance. Therefore, this thesis also studies the impact of channel model on the outcomes of channel governance in Luzhou Laojiao and the moderating role of the channel mode on the relationship between channel governance mechanism and outcomes investigated. The results show that: 1) whether the unilateral or bilateral governance mechanisms, they all have a significant impact on the coordination among channel members. Among them, the unilateral incentive has a significant negative correlation with the coordination among channel members; while the bilateral incentive and enforcement mechanisms have a significant positive correlation with the coordination among channel members. In addition, the bilateral enforcement mechanism has a significant negative correlation with the conflict among channel members. 2) The channel mode has a significant positive correlation with the coordination among channel members, which shows that the QIQUAN channel mode facilitates coordination among channel members. However, the relationship between the channel mode and the conflict among channel members is not significant. In addition, the QIQUAN channel mode also enhances positive correlation between the bilateral monitoring mechanism and the coordination among channel members and weakens the negative correlation between the unilateral enforcement and the conflict among channel members. 3) Neither dependence of manufacturers on distributors nor the dependence of distributors on the manufacturer is conducive to coordination among channel members, which will also increase the conflict among channel members. Moreover, such a relative dependence will also moderate the relationship between the channel governance mechanism and the corresponding outcomes. Through this study, it can complement the deficiency in study of a single or unilateral channel governance mechanism of the governance outcomes and broaden the depth and width in the study. Second, while examining the impact of the channel governance mechanism on the channel governance outcomes, we also study in an innovative manner the impact of the channel mode on the channel governance outcomes and explore the moderating role of the channel mode on the relationship between the governance mechanism and governance outcomes, which makes our results more realistic and our findings have more applications.
A governança dos canais de distribuição é um tópico importante na pesquisa em Gestão de Empresas. Quer a governança dos canais de distribuição quer os mecanismos de controlo irão influenciar o comportamento dos membros envolvidos, e deste modo irão afetar os resultados da governança do canal. A transformação da economia chinesa provoca mudanças na ideologia do povo chinês. A eficácia dos incentivos unilaterais tradicionais, os mecanismos de monitorização e “enforcement” por parte de um membro sobre outro membro estão a ser questionados, enquanto os incentivos bilaterais e os mecanismos de monitorização e “enforcement” discutidos pelas partes envolvidas têm recebido cada vez mais atenção. Por outro lado, como o impacto da interdependência entre os membros do canal e os resultados da governança são lentamente percebidos pelos académicos e necessitam de validação empíricas, os membros do canal estão mais inclinados para reduzir a dependência de contrapartes. Recentemente, os produtores chineses de licor representados pela Luzhou Laojiao iniciaram um modelo de canal de distribuição inovador para resolver os conflitos entre os membros, e deste modo melhorar a coordenação entre os diferentes membros participantes. Todos estes fenómenos indicam que os mecanismos e instrumentos de governança dos canais estão constantemente a ser postos em prova e melhorados na prática diária da governança dos canais. Contudo a eficácia destes mecanismos e instrumentos nos resultados da governança não foram totalmente investigados, e o impacto deste novo modelo de canal de distribuição, o grau de interdependência entre os produtores e os distribuidores e outros fatores que influenciam a relação entre os mecanismos de governança do canal e os resultados da governança também necessitam de maior clarificação. Esta tese toma a Luzhou Laojiao e o seu sistema de distribuição como base para investigar as seguintes três questões. Primeiro, incluímos em simultâneo mecanismos unilaterais e bilaterais de governança de canais no quadro da governança para estudarmos o impacto de seis mecanismos de governança (incentivos bilaterais e unilaterais, monitorização e “enforcement”) nos resultados da governança do canal. Segundo, tomando como base a literatura existente, a dependência relativa entre os produtores e os distribuidores afeta os resultados da governança do canal e irá moderar a relação entre mecanismos específicos da governança do canal e os resultados correspondentes da governança. Deste modo, esta tese estuda também o impacto dessa dependência relativa entre produtores e distribuidores nos resultados da governança do canal de distribuição da Luzhou Laojiao e o papel moderador dessa interdependência na relação entre a governança do canal e os resultados investigados. Terceiro, existem dois modelos típicos de canais na Luzhou Laojiao. Um é o modelo tradicional e o outro é modelo inovador – o modelo QIQUAN. Este modelo é significativamente diferente do modelo tradicional em termos de gestão, administração, partilha de operações e de lucro, e por isso vai ter um impacto nos resultados da governança do canal. Deste modo esta tese também estuda o impacto do modelo de canal nos resultados da governança na Luzhou Laojiao e o papel moderador do modelo de canal na relação entre os mecanismos de governança do canal e os resultados investigados. Os resultados mostram que: 1) os mecanismos unilaterais e bilaterais de governança têm um impacto muito importante na coordenação entre os membros do canal. Entre eles, o incentivo unilateral tem uma forte correlação negativa com a coordenação entre membros do canal; enquanto os incentivos bilaterais e os mecanismos de “enforcement” têm uma forte correlação positiva com a coordenação entre os membros do canal. Além disso, o mecanismo de “enforcement” bilateral tem uma forte correlação negativa com o conflito entre membros do canal. 2) O modelo de canal tem uma forte correlação positiva com a coordenação entre os membros do canal, o que mostra que o modelo de canal QIQUAN facilita a coordenação entre os membros. Contudo, a relação entre o modelo de canal e o conflito entre os seus membros não é muito significante. Por outro lado, o modelo de canal QIQUAN melhora também a correlação positiva entre os mecanismos bilaterais de monitorização e a coordenação entre os membros do canal e enfraquece a correlação negativa entre o “enforcement” unilateral e o conflito entre os membros. 3) Nem a dependência dos produtores nos distribuidores nem a dependência dos distribuidores nos produtores conduz à coordenação entre os membros do canal, o que aumenta o conflito entre os membros do canal. Além disso, esta dependência relativa irá moderar a relação entre os mecanismos de governança do canal e os resultados correspondentes. Este estudo, ao incluir simultaneamente mecanismos unilaterais e bilaterais de governança aprofunda e alarga os estudos existentes. Por outro lado, ao estudamos o impacto dos mecanismos de governança do canal nos resultados da governança, estamos a estudar de uma maneira inovadora o impacto do modelo de canal nos resultados da governança e a explorar o papel moderador do modelo de canal na relação entre os mecanismos de governança e os resultados da governança, o que faz com que os nosso resultados estejam relacionados coma realidade e sejam úteis ao mundo empresarial.
Μαγεράκης, Ευστάθιος. « Cash holdings and firm characteristics : evidence from UK market ». Thesis, 2015. http://hdl.handle.net/10889/8739.
Texte intégralΣτην παρούσα διατριβή εξετάζονται οι προσδιοριστικοί παράγοντες του δείκτη μετρητών σε επιχειρήσεις του Ηνωμένου Βασιλείου μεταξύ των ετών 1980 και 2012. Η διακράτηση μετρητών αποτελεί παγκόσμιο φαινόμενο και λαμβάνει της ανάλογης προσοχής από πληθώρα ερευνητών. Σε αυτή τη βάση, η μελέτη αυτή έχει ως στόχο να ρίξει φως σχετικά με την εμπειρική σχέση μεταξύ του δείκτη μετρητών και τα συγκεκριμένα χαρακτηριστικά που επηρεάζουν την ρευστότητα στις επιχειρήσεις διαχρονικά. Αρχικά η έρευνα ενσωματώνει μια βιβλιογραφική ανασκόπηση. Προς το σκοπό αυτό, οι σχετικές οικονομικές θεωρίες και οι προηγούμενες εμπειρικές μελέτες παρουσιάζονται. Στη συνέχεια, τα αναμενόμενα αποτελέσματα της έρευνας συντίθενται σε ένα σύνολο διακριτών υποθέσεων και δοκιμάζονται με ανάλυση παλινδρόμησης. Τα εμπειρικά ευρήματα υποδηλώνουν ότι ο δείκτης μετρητών σχετίζεται θετικά με τις επενδυτικές ευκαιρίες, τις δαπάνες Ε&Α και τον λόγο της αγοραίας προς τη λογιστική αξία των βιβλίων της επιχείρησης. Ο δείκτης μετρητών επίσης, σχετίζεται θετικά με την μεταβλητότητα των ταμειακών ροών του κλάδου και επηρεάζεται αρνητικά από τις ταμειακές ροές, το καθαρό κεφάλαιο κίνησης, τις κεφαλαιακές δαπάνες, την μόχλευση, τα φορολογικά έξοδα, την ηλικία και το μέγεθος των επιχειρήσεων. Όσον αφορά την εξέλιξη των προσδιοριστικών παραγόντων των ταμειακών ρευστών διαθεσίμων, η μελέτη δείχνει ότι τρεις είναι οι κύριες μεταβλητές που επηρεάζουν τη διακράτηση μετρητών κατά τη διάρκεια των χρόνων της ανάλυσης. Ειδικότερα, η μόχλευση, το φορολογικό καθεστώς και τις κεφαλαιακές δαπάνες επηρεάΖουν σημαντικά την απόφαση για εταιρική ρευστότητα στην αγορά του Ηνωμένου Βασιλείου. Επιπλέον, τα αποτελέσματα δείχνουν ότι η διακράτηση μετρητών ακολουθεί κυρίως την trade off θεωρία. Πράγματι, τα ευρήματά προσφέρουν χρήσιμες γνώσεις σχετικά με τους παράγοντες που καθορίζουν τη διακράτηση μετρητών των επιχειρήσεων κατά τη διάρκεια των τριών τελευταίων δεκαετιών. Τα ευρήματα αυτά μπορεί να είναι επωφελή για οικονομολόγους, επενδυτές και συμβούλους.
Santos, Ângelo Emanuel Neves dos. « Design and simulation of a smart bottle with fill-level sensing based on oxide TFT technology ». Master's thesis, 2016. http://hdl.handle.net/10362/19593.
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