Dissertationen zum Thema „Dissipative analysis“
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Gibson, Jonathan Brian. „Application and analysis of dissipative particle dynamics“. Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367133.
Der volle Inhalt der QuelleEichenauer, Florian. „Analysis for dissipative Maxwell-Bloch type models“. Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17661.
Der volle Inhalt der QuelleThis thesis deals with the mathematical modeling of semi-classical matter-light interaction. In the semi-classical picture, matter is described by a density matrix "rho", a quantum mechanical concept. Light on the other hand, is described by a classical electromagnetic field "(E,H)". We give a short overview of the physical background, introduce the usual coupling mechanism and derive the classical Maxwell-Bloch equations which have intensively been studied in the literature. Moreover, We introduce a mathematical framework in which we state a systematic approach to include dissipative effects in the Liouville-von-Neumann equation. The striking advantage of our approach is the intrinsic existence of a Liapunov function for solutions to the resulting evolution equation. Next, we couple the resulting equation to the Maxwell equations and arrive at a new self-consistent dissipative Maxwell-Bloch type model for semi-classical matter-light interaction. The main focus of this work lies on the intensive mathematical study of the dissipative Maxwell-Bloch type model. Since our model lacks Lipschitz continuity, we create a regularized version of the model that is Lipschitz continuous. We mostly restrict our analysis to the Lipschitz continuous regularization. For regularized versions of the dissipative Maxwell-Bloch type model, we prove existence of solutions to the corresponding Cauchy problem. The core of the proof is based on results from compensated compactness due to P. Gérard and a Rellich type lemma. In parts, this proof closely follows the lines of an earlier work due to J.-L. Joly, G. Métivier and J. Rauch.
Gao, Dalong. „Control limitation analysis for dissipative passive haptic interfaces“. Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11112005-114601/.
Der volle Inhalt der QuelleArkin, Ronald, Committee Member ; DeWeerth, Steve, Committee Member ; Vito, Raymond, Committee Member ; Ebert-Uphoff, Imme, Committee Member ; Book, Wayne, Committee Chair. Includes bibliographical references.
Feng, Zhiguang, und 冯志光. „Dissipative control and filtering of singular systems“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50899612.
Der volle Inhalt der Quellepublished_or_final_version
Mechanical Engineering
Doctoral
Doctor of Philosophy
Dincer, Ayse. „Numerical And Experimental Analysis Of Dissipative Silencer Coupled With Quarter Wave Tube“. Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615527/index.pdf.
Der volle Inhalt der QuelleCiornei, Mihaela-Cristina. „Rôle de l'inertie dans la dynamique dissipative du macrospin“. Phd thesis, Ecole Polytechnique X, 2010. http://tel.archives-ouvertes.fr/tel-00460905.
Der volle Inhalt der QuelleMacias, Diaz Jorge. „A Numerical Method for Computing Radially Symmetric Solutions of a Dissipative Nonlinear Modified Klein-Gordon Equation“. ScholarWorks@UNO, 2004. http://scholarworks.uno.edu/td/167.
Der volle Inhalt der QuelleEichenauer, Florian [Verfasser], Alexander [Gutachter] Mielke, Matthias [Gutachter] Eller und Serhiy [Gutachter] Yanchuk. „Analysis for dissipative Maxwell-Bloch type models / Florian Eichenauer ; Gutachter: Alexander Mielke, Matthias Eller, Serhiy Yanchuk“. Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://d-nb.info/1122167784/34.
Der volle Inhalt der QuelleTassotti, Luca. „Seismic analysis and design of innovative steel and concrete hybrid coupled wall systems“. Doctoral thesis, Università Politecnica delle Marche, 2015. http://hdl.handle.net/11566/242920.
Der volle Inhalt der QuelleThe concept of structural fuse applied to earthquake resistant systems has led to the development of several seismic-resistant structural solutions, including interesting steel and concrete hybrid systems. These systems are obtained through a combination in series of steel elements and reinforced concrete elements with the aim of exploiting at their best the potentialities of each material. In this work the seismic behaviour of an innovative hybrid coupled shear wall (HCSW) system, developed in the European research project INNO-HYCO (INNOvative HYbrid and COmposite steel-concrete structural solutions for building in seismic area), is investigated. The earthquake resistant solution is composed by a reinforced concrete wall coupled to steel side columns by means of easily replaceable steel links with the objective to exploit both the stiffness of reinforced concrete wall, necessary to limit building damage under low-intensity earthquakes, and the ductility of steel links, necessary to dissipate energy under medium- and high-intensity earthquakes. The seismic behaviour of the system is assessed through nonlinear static (pushover) analysis and multi-record nonlinear incremental dynamic analysis (IDA). For this purpose, firstly a set of realistic case studies is designed, then a finite element model is developed into the platform Opensees and validated through comparisons against experimental tests including local and global responses quantities. A selection of results including global and local response quantities is shown in order to highlight the potentialities of the proposed innovative HCSW systems and the actual possibility to develop a ductile behaviour where plastic deformation are attained in the steel links before yielding in the reinforced concrete wall. The final results permit to provide a support for the identification of optimal solutions that could be competitive against existing seismic resistant structural systems.
Moraux, Didier. „Amélioration du comportement dynamique général d'une structure mécanique par l'extension du concept de réanalyse à la réanalyse modale dissipative et à la réanalyse de la réponse forcée“. Valenciennes, 1993. https://ged.uphf.fr/nuxeo/site/esupversions/689e15e0-4c62-4547-8b38-b7a6dbb9be3b.
Der volle Inhalt der QuelleSotta, Paul. „Facettage des phases cubiques lyotropes. Elastomères étudiés par RMN. Transition vitreuse dans les polymères en volume et en films minces. Fluage dans un système élastique désordonné“. Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00009614.
Der volle Inhalt der QuelleBorra, Chaitanya. „DYNAMICS OF LARGE ARRAY MICRO/NANO RESONATORS“. University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590758736333883.
Der volle Inhalt der QuelleFørde, Olav Øyvind. „Analysis of the Turbulent Energy Dissipation“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18694.
Der volle Inhalt der QuelleJoly, Romain. „Dynamique des EDP dissipatives“. Habilitation à diriger des recherches, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00908118.
Der volle Inhalt der QuelleErskine, Jon S. „Effects of welding on energy dissipation in a watertight bulkhead“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FErskine.pdf.
Der volle Inhalt der QuelleIbrahim, Heide Nadda. „Tracking coherences in a dissipative ocean analysing and controlling Br2/Ar matrix“. Göttingen Cuvillier, 2008. http://d-nb.info/989862305/04.
Der volle Inhalt der QuelleWang, Lipo. „Geometrical description of homogeneous shear turbulence using dissipation element analysis“. Aachen : Shaker, 2008. http://d-nb.info/989018180/04.
Der volle Inhalt der QuelleVoller, Gordon Paul. „Analysis of heat dissipation from railway and automotive friction brakes“. Thesis, Brunel University, 2003. http://bura.brunel.ac.uk/handle/2438/5558.
Der volle Inhalt der QuelleSorenson, Logan D. „Design and analysis of microelectromechanical resonators with ultra-low dissipation“. Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52910.
Der volle Inhalt der QuelleWang, Lipo [Verfasser]. „Geometrical description of homogeneous shear turbulence using dissipation element analysis / Lipo Wang“. Aachen : Shaker, 2008. http://d-nb.info/997762934/34.
Der volle Inhalt der QuellePremkumar, Daryl. „OPTIMIZATION OF BRAKE PAD GEOMETRY TO PROMOTE GREATER CONVECTIVE COOLING TO INCREASE HEAT DISSIPATION RATE“. OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2322.
Der volle Inhalt der QuelleEbenbauer, Christian. „Polynomial control systems : analysis and design via dissipation inequalities and sum of squares /“. Düsseldorf : VDI-Verl, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014984316&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Der volle Inhalt der QuelleChen, Zhong. „Cutting fluid aerosol generation and dissipation in machining process : analysis for environmental consciousness“. Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17929.
Der volle Inhalt der QuelleBellon, Ludovic. „Vieillissement des systèmes vitreux et rapport fluctuation-dissipation“. Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2001. http://tel.archives-ouvertes.fr/tel-00003649.
Der volle Inhalt der QuelleCe travail propose une étude expérimentale au niveau fondamental du vieillissement des matériaux vitreux, en vue de valider les approches théoriques récentes sur le sujet. Dans un premier chapitre, nous introduisons ces nouveaux concepts : basés sur l'analogie verre de spin - verre structuraux, ils définissent la température effective Teff de ces systèmes faiblement mais durablement hors d'équilibre. Cette observable se mesure via le rapport fluctuation dissipation d'un tel système.
Le second chapitre est consacré à l'étude de l'effet rajeunissement-mémoire dans un polymère, le poly(methyl methacrylate) (PMMA). En s'inspirant d'expériences sur les verres de spins, nous démontrons une analogie de comportement forte sur des effets fins entre ces systèmes très différents. Une interprétation théorique en terme de paysage d'énergie hiérarchique permet de rendre compte de ces propriétés communes. Cette similitude fait du PMMA un bon candidat pour une étude du rapport fluctuation dissipation, introduite dans un troisième chapitre. Notre approche du problème, basée sur la mesure des propriétés électriques, est soigneusement analysée pour déterminer précisément les barres d'erreurs. Nous démontrons ainsi la nécessité d'améliorer le rapport signal sur bruit de notre expérience avant de tirer des conclusions.
Dans les deux derniers chapitres, nous étudions un verre colloïdal : la Laponite. La mesure de Teff à l'aide des propriétés électriques de ce système, en suivant le protocole du troisième chapitre, met cette fois en évidence une nette violation du théorème fluctuation dissipation, en accord avec les théories récentes sur le vieillissement. Pour tester le caractère intrinsèque de cette température effective, nous en proposons finalement une seconde détermination à l'aide des propriétés rhéologiques du matériau. Un rhéomètre ultra-sensible est ainsi conçu, et les résultats préliminaires de cette expérience sont présentés.
Jayaraman, Dheepakkumaran. „Optimization Techniques for Performance and Power Dissipation in Test and Validation“. OpenSIUC, 2012. https://opensiuc.lib.siu.edu/dissertations/473.
Der volle Inhalt der QuelleLindén, Ronja, und Henrik Samuelsson. „Thermal analysis and design improvement of light module fixture“. Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-30485.
Der volle Inhalt der QuelleDeMarco, Adam W. „A Mesoscale Model Analysis of Sea Fog Formation and Dissipation Near Kunsan Air Base“. Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/6786.
Der volle Inhalt der QuelleBuisson, Lionel. „Intermittence pendant le vieillissement et relation fluctuation dissipation“. Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2003. http://tel.archives-ouvertes.fr/tel-00005035.
Der volle Inhalt der Quellebasée sur l'analogie entre verres de spin et verres structuraux, a
été réalisée en introduisant une température effective Teff
pour ces systèmes faiblement hors équilibre. Cette nouvelle
observable se mesure via le rapport fluctuation dissipation.
La mesure de Teff sur les propriétés diélectriques d'un verre
polymérique (polycarbonate) après une trempe sous la température
de transition vitreuse montre que le théorème fluctuation
dissipation est fortement violé. L'amplitude et la persistance
dans le temps de cette violation sont des fonctions décroissantes
de la fréquence. Autour de 1 Hz, elle persiste plusieurs heures.
L'origine de la violation semble être due à une dynamique
fortement intermittente caractérisée par de grandes fluctuations.
Cette intermittence semble dépendre de la vitesse de trempe et de
la température d'arrêt. Une interprétation théorique basée sur le
modèle en piège permet de rendre compte de cette dynamique.
Un comportement intermittent très similaire a été observé pour un
verre colloïdal (Laponite) pendant la transition de l'état liquide
à l'état solide alors qu'aucune violation ou intermittence n'ont
été observées après une trempe lente réalisée sur un autre verre
polymérique, le poly(méthyl méthacrylate) (PMMA).
Nous présentons également une mesure mécanique préliminaire de la
relation fluctuation dissipation sur une tige de polycarbonate à
l'aide d'un interféromètre de Nomarski à deux bras.
Chassaigne, Adrien. „Contribution à la conception des assemblages mécaniques utilisant des matériaux fortement dissipatifs“. Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC020.
Der volle Inhalt der QuelleDynamics of complex structures with dissipative materials is an high stake for mechanical design and optimization. Polymeric materials are commonly used in this way. These materials are effective in various industry, but mastering their use comes up against technological limitations. One of these limitation is the characterization of mechanical properties as a function of frequency and this thesis deals with it. Two contributions are provided in this experimental research work. The first one concerns the time–temperature superposition principle. This principle makes it possible to extend the mechanical properties measured over a restricted frequency range from data obtained at different temperatures. This widespread method is unfortunately not valid for many polymeric materials. It is the reason why innovative structural adhesives are studied in order to characterize the limits of the principle of time-temperature equivalence. The approach is carried out using data from a dynamic mechanical analysis (DMA) conducted on a commercial test bench. The second contribution are part of the first one and represents the main objective of this thesis. An innovative DMA bench is developed for the characterization of polymers over wide frequency ranges without requirements of the principle of time-temperature equivalence. The bench performances are precisely assessed through a characterization campaign conducted on polymer adhesives
Peng, Bo. „Applying the Newmark Method to the Discontinuous Deformation Analysis“. Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/51092.
Der volle Inhalt der QuelleMaster of Science
Ibrahim, Heide [Verfasser]. „Tracking coherences in a dissipative ocean: Analysing and controlling Br2/Ar matrix / Heide Ibrahim“. Berlin : Freie Universität Berlin, 2008. http://d-nb.info/1023097702/34.
Der volle Inhalt der QuelleFeng, Jiling. „Wave propagation in flexible tubes“. Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5367.
Der volle Inhalt der QuelleBabadjian, Jean-François. „Méthodes variationnelles pour l'étude de milieux dissipatifs : applications en rupture, endommagement et plasticité“. Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00804504.
Der volle Inhalt der QuelleYuliar, Sonny. „Dissipative systems theory : analysis and synthesis“. Phd thesis, 1996. http://hdl.handle.net/1885/9808.
Der volle Inhalt der QuelleSheng-Yuang, Lo, und 羅聖源. „Dissipative Analysis of Water-Hammer Wave Propagation“. Thesis, 2001. http://ndltd.ncl.edu.tw/handle/33573051149707235658.
Der volle Inhalt der Quelle國立成功大學
水利及海洋工程學系
89
Water hammer wave, once occurs and propagates in a piping system, will be eventually dissipated. As the energy dissipation in a pipe is very important for safety of the system, the related mechanism is worthy of further discussion. In 2000, Lin conducted a series of water hammer experimental studies in the laboratory of Department of Hydraulic and Ocean Engineering, NCKU. He measured the transient pressure head developed by downstream value closure during a short duration in a reservoir-pipeline-valve system. Lin’s experiments explored the significant effects of initial flow speed on the wave generation and the propagation characteristics in the system. However, he did not discuss about the detailed mechanism of long-term dissipation in the pipe quantitatively. It is the objects of this thesis to extract from Lin’s experimental data that the author intends to evaluate those quantities in non-linearity, friction and dissipation on the detailed process of phenomena in time, frequency and joint time-frequency domains. Hardly is to obtain the analytic solutions from the nonlinear, coupled system equations for a water hammer problem, which consists of two conservation laws in momentum and mass. Instead, in this study, the numerical application was utilized by using the temporal two-step averages with spatial central difference scheme so that each term in the governing system can be estimated. After obtaining the water head histogram from measurement, one can determine the histograms of other flow quantities term by term from the differential equations. The joint time-frequency analysis is also helpful to understand more detail in evolved wave dissipating process. Among 18 run cases of Lin’s experiment, run 1 is adopted for water hammers without column separation, whereas run 17 is that with column separation. On the measured data of these two runs, the author analyzed the dissipating terms by means of spectral transformation. As shown from the results of energy distributions in frequency domain, in the case without column separation, the energy contributes only on multiplicity among main frequencies, whereas no simple rule could be concluded in the case with column separation condition. It is found from the experiment evidence that the use of Darcy-Wesbach law, friction loss being proportional to square of velocity, is not satisfactory, whether a water hammer with and without, column separation. It is complicated for the nonlinear mechanism of energy dissipation on water hammers in a piping system if column separation involves. Even though it is simpler for the case without column separation, more analytical and statistical studies are required to reveal the complete dissipation mechanism in water hammers.
Leeburn, Dominic Andrew. „Analysis and design of dissipative frequency selective two-layer conductive structures“. Thesis, 2014.
Den vollen Inhalt der Quelle finden(10669023), Fukeng Huang. „A new scalar auxiliary variable approach for general dissipative systems“. Thesis, 2021.
Den vollen Inhalt der Quelle findenSu, David Wen-Fong, und 蘇紋楓. „Design and analysis of insulated coaxial slot antenna embedded in dissipative medium“. Thesis, 1999. http://ndltd.ncl.edu.tw/handle/20996532730712189633.
Der volle Inhalt der Quelle國立交通大學
電信工程系
87
In this dissertation, a systematic method of designing insulated applicators for interstitial microwave hyperthermia is presented. First of all, a fast algorithm that exploits the translational symmetry properties associated with a thin-wire radiation integral to improve its computational efficiency for determining the near-field characteristics of an insulated dipole antenna (IDA) embedded in a homogeneous dissipative medium is described. In one case investigated, the basic thin-wire approach that uses no symmetry property is found to yield accurate results in approximately 380 times less CPU time than the traditional King-Casey approach. In another case, use of symmetry property further reduces the CPU time by a factor of 7; additional reduction in CPU time is also possible by taking into account the near-field nature of the problem. Subsequently, transmission-line-approximation type of input impedance model originally developed by King et al. [4] for the interstitial dipole antenna embedded in a conductive medium is extended to the case of insulated coaxial slot antenna (ICSA). Physical construction of the later indicates the presence of additional current path(s) inside the feed line of the triaxial cable which shall lead to the shortening of its resonance length. This effect is taken into account in the impedance model and verified to be accurate by experiments. Furthermore, a simple strategy for optimizing the applicator’s impedance matching performance is also described. Excellent agreements observed between theoretical and measured data indicate that these models can be relied upon when designing efficient applicator for interstitial microwave hyperthermia. Finally, a novel use of asymmetrically-fed ICSA type of applicator for interstitial microwave hyperthermia that simultaneously exhibits good impedance matching and enhanced tip-heating performances is presented. Theoretical analysis reveals that by making the distal arm much shorter than the proximal arm of the antenna, charge densities distributed over the distal arm of the antenna increase significantly. This in turn can result in the radial electric field component becoming the dominant contributor to the specific absorption rate (SAR) over the distal arm side of the heating region and, therefore, the achievement of enhanced tip-heating performance. With the length of the longer proximal arm chosen to be slightly longer than a quarter wavelength, good impedance matching and enhanced tip-heating performances are achieved when the length of the shorter distal arm is reduced to no more than 25% that of the longer proximal arm. Good agreements observed between theoretical and measured SAR patterns for two ICSAs designed for operation at 915- and 433-MHz, respectively, confirm the validity of the design method.
Yu, Shih-Tung, und 于旭東. „Microphase separation and Molecular Conformation Analysis of AB2 Miktoarm Star Copolymers by Dissipative Particle Dynamics“. Thesis, 2006. http://ndltd.ncl.edu.tw/handle/66970873225967160691.
Der volle Inhalt der Quelle國立臺灣大學
高分子科學與工程學研究所
95
We employ the dissipative particle dynamics (DPD) to simulate the microphase separation behavior of AB2 miktoarm star copolymers. The phase diagram is constructed in terms of the interaction parameters and composition, is in a near quantitative agreement with that predicted by self-consistent mean-field (SCMF) theory. However, when the composition of B is small, we observe that AB2 can not easily form the ordered microstructures as have been predicted by SCMF. Instead, they form a tube-like phase, which frequently has been observed in experiments. In addition, though the systems with smaller value of A composition form the spheres as SCMF predicted, we find that due to the finite size effects, it becomes difficult to examine the most stable packing arrays of spheres. In the analysis of radius of gyration, when the interaction parameter increases so that AB2 copolymers transform from a disordered into an ordered state, we find that the radius of gyration for each A and B arm remains somewhat a constant. However, the overall radius of gyration of AB2 significantly increases with the interaction parameter. This manifests the fact that in order to reduce the contacts between A and B, the angle between A and B arms increases and the angle between B and B arms decreases. When the interaction parameter is fixed, the radius of gyration increases with fA. By analyzing the power law , we find that the B arms are more stretchable than A arms.
Graziano, Roberta Sauro. „Watersheds as complex dissipative geochemical systems: stability, variability and resilience. Theory and practical applications“. Doctoral thesis, 2021. http://hdl.handle.net/2158/1269219.
Der volle Inhalt der QuelleKammula, Viswanath. „Application of Hybrid Simulation to Fragility Assessment of Self-centering Energy Dissipative (SCED) Bracing System“. Thesis, 2012. http://hdl.handle.net/1807/36369.
Der volle Inhalt der QuelleLin, Yu-Chih, und 林裕智. „Microphase separation Analysis of A-block-(B-graft-C) Linear-comb Copolymers by Dissipative Particle Dynamics“. Thesis, 2007. http://ndltd.ncl.edu.tw/handle/01248900479232424732.
Der volle Inhalt der Quelle臺灣大學
高分子科學與工程學研究所
95
We employ the dissipative particle dynamics (DPD) to examine the microphase separation of A-block-(B-graft-C) copolymer. In this study, the effects caused by connect of ratio were reduced, and it was hypothesized that in the linear-comb copolymer, every B bead were attached with a C bead. Taking advantage of changing interaction parameter, composition, and degree of polymerization, we succeeded in constructing a series phase diagram of A-block-(B-graft-C) copolymer. Moreover, we found a hierachical structure with two length scales, i.e., the so-called structure-within-structure, can be induced by A-coil block and BC-comb block. First of all, by vary the value of interaction parameter, aAC = aBC and aAB, we can observe the morphology transition, or even find the hierachical structure. In addition, we also discovered that hierachical structure and the length of the BC-comb block are closely related by looking into the relation between degree of polymerization and composition. In other words, when the length of the BC-comb block is shorter, the resulting morphology is mainly in the large-length-scale ordering between the A-rich and C-rich domains with most of the B in the interfaces; on the other hand, when the length of the BC-comb block is long enough, we can find the hierachical structure of the same as the experiment. Therefore, along with the increase of A composition fA, the degree of polymerization in hierachical structure would increase in series as well. Finally, we manipulated interaction parameter, aAB、aAC、aBC, and found that under low aAC, we cannot observe the micro-structure of hierachical structure even if we raise aBC. This is due to the fact that the high miscibility of A and B would block the large-length-scale separation of A-coil block and BC-comb block. On the other hand, under higher aAC, the large-length-scale separation of A- coil block and BC-comb block, and the small-length scale separation of BC-domain would occur resulting from the immiscibility of A to B and A or B to C. Moreover, under very high aAC and aBC, BC-chain would stretch ever more, which then causes the large-length-scale morphology varies in the hierachical structure. By vary the value of interaction parameter, aAB、aAC、aBC, we found that hierachical structure must be formed under higher interaction parameter. To boil down, from the results we find that interaction parameter, composition, and degree of polymerization all play in indisputable role in forming hierachical structure.
Wu, Yung-Hsu, und 吳永旭. „Effects of Chain Length and Bond Strength on Phase Separation Dynamics-a Dissipative Particle Dynamics Simulation Analysis“. Thesis, 2008. http://ndltd.ncl.edu.tw/handle/36526936616133530597.
Der volle Inhalt der Quelle國立臺灣大學
化學工程學研究所
96
Dissipative particle dynamics (DPD) was employed to perform three- dimensional simulations to investigate the phase separation dynamics of polymer solutions with different polymer chain length and bond strength. How the chain length and bond strength influenced the concentration fluctuation, morphology evolution and coarsening mechanism of polymer-rich regions during the phase separation were presented. The results show that phase separation dynamics was suppressed by the chain length effects and the hindrance effect resulted from enhanced spring between polymer segments. On morphology evolution, the chain length effect sustained the bicontinuous structure, and the bond strength effect due to the increase of spring constant resulted in local aggregation of polymer-rich regions.. The growth of polymer-rich domains was analyzed to study the effects of chain length and bond strength on coarsening mechanism. For the polymer solution composed of shorter and more flexible chains, a two–stage coarsening was observed with the crossover of the domain growth exponent from 1/3 to 2/3 during the course of phase separation. The crossover reflected that the growth mechanism altered from diffusion to interfacial-tension driven flow. When the chain flexibility was kept the same but the chain length increased, the growth exponent was reduced to 1/4 in the diffusion-dominating coarsening regime, while effects on the growth exponent in the flow–dominating regime were absent. Besides, the concentration fluctuation as well as the dissipation of interfacial energy during phase separation was suppressed. When the chain length was kept short but the bond strength was enhanced by increasing the spring constant between the polymer segments, the growth exponent approached 1/5 in the diffusion-dominating regime. Nevertheless, the entanglement effects in the flow-dominating coarsening regime were not remarkable. The chain length effect slowed down the domain growth, which could be explained by that polymer chains could only perform reptation when chain entanglements occurred. Moreover, when both the effects of chain length and bond strength were enhanced, polymer networks composed of longer chains with stronger bond strength imposed an energy barrier for phase separation to occur, which corresponded to the Frenkel-Flory-Rehner hypothesis. As a result, the polymer solution with longer chains with stronger bond strength can only undergo phase separation when a larger quench depth was employed to initiate the phase separation, reflecting that the entanglement effects derived from the increase of chain length and bond strength were alleviated with the deeper quench.
Wu, Yung-Hsu. „Effects of Chain Length and Bond Strength on Phase Separation Dynamics-a Dissipative Particle Dynamics Simulation Analysis“. 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2907200814153900.
Der volle Inhalt der QuellePanigrahi, Satyanarayan. „Analysis Of Multiply-Connected Acoustic Filters with Application To Design Of Combination Mufflers And Underwater Noise Control Linings“. Thesis, 2006. https://etd.iisc.ac.in/handle/2005/367.
Der volle Inhalt der QuellePanigrahi, Satyanarayan. „Analysis Of Multiply-Connected Acoustic Filters with Application To Design Of Combination Mufflers And Underwater Noise Control Linings“. Thesis, 2006. http://hdl.handle.net/2005/367.
Der volle Inhalt der QuelleCoppex, François. „Sur une classe de systèmes dissipatifs hors d'équilibre“. Phd thesis, 2005. http://tel.archives-ouvertes.fr/tel-00008990.
Der volle Inhalt der QuelleAnil, N. „Optimal Control Of Numerical Dissipation In Modified KFVS (m-KFVS) Using Discrete Adjoint Method“. Thesis, 2008. https://etd.iisc.ac.in/handle/2005/710.
Der volle Inhalt der QuelleAnil, N. „Optimal Control Of Numerical Dissipation In Modified KFVS (m-KFVS) Using Discrete Adjoint Method“. Thesis, 2008. http://hdl.handle.net/2005/710.
Der volle Inhalt der QuelleHwang, Guey-Lin, und 黃貴麟. „Energy dissipation analysis of Cascade flows“. Thesis, 1996. http://ndltd.ncl.edu.tw/handle/77260785658536572214.
Der volle Inhalt der Quelle國立中央大學
土木工程學系
84
The characteristics of energy dissipation for one-step nappe flows is explored in this study by employing experimental measurements. Before reaching the recirculating zone, the nappe trajectory after the free fallis very close to the analytical solution proposed by Marchi(1993), and the nappe trajectory then deviates from Marchi's soluation due to the effect of hydrostatic pressure. The energy dissipation after the free fall is close to White's(1943) analysis when the relative recirculating water depth is small, while the energy loss is better described by Gill's(1979) analysis at large recirculating water depth.