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Sonja Dieterich zeigt, dass die Natur der Phasenumwandlung von der smektischen A- in die smektische C Phase ein wichtiges Kriterium für die Anwendbarkeit des Langevin-Modells ist, welches das elektrooptische Verhalten von Flüssigkristallen vom de Vries-Typ beschreibt. Dagegen spielt die genaue chemische Struktur des Mesogens, die seine nanosegregierenden Eigenschaften beeinflusst, eine untergeordnete Rolle. Weiterhin konnte die Autorin smektische Schichten kalamitischer nanosegregierender Mesogene mittels Freeze-Fracture Transmissionselektronenmikroskopie direkt abbilden. Der Inhalt Flüssigkristalle vom de Vries-Typ Beschreibung des elektrooptischen Verhaltens mittels des Langevin-Modells Vergleichende elektrooptische Untersuchungen zur Kopplung von Tiltwinkel und Doppelbrechung Freeze-Fracture Transmissionselektronenmikroskopie smektischer Flüssigkristallphasen Die Zielgruppen Dozierende und Studierende der Chemie, insbesondere der physikochemischen Fachgebiete Flüssigkristallforschung und weiche Materie Die Autorin Sonja Dieterich promoviert derzeit am Institut für Physikalische Chemie der Universität Stuttgart. Nachdem sie sich intensiv mit thermotropen Flüssigkristallen vom de Vries-Typ beschäftigt hat, liegt ihr derzeitiger Forschungsschwerpunkt auf dem Gebiet der gelierten lyotropen Flüssigkristalle.
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This brief offers a concise presentation of granular fluids from the point of view of non-equilibrium statistical physics. The emphasis is on fluctuations, which can be large in granular fluids due to the small system size (the number of grains is many orders of magnitude smaller than in molecular fluids). Firstly, readers will be introduced to the most intriguing experiments on fluidized granular fluids. Then granular fluid theory, which goes through increasing levels of coarse-graining and emerging collective phenomena, is described. Problems and questions are initially posed at the level of kinetic theory, which describes particle densities in full or reduced phase-space. Some answers become clear through hydrodynamics, which describes the evolution of slowly evolving fields. Granular fluctuating hydrodynamics, which builds a bridge to the most recent results in non-equilibrium statistical mechanics, is also introduced. Further and more interesting answers come when the dynamics of a massive intruder are discussed. Such non-equilibrium stochastic process offers a more precise and compact picture of the features foreseen at the more detailed levels of description. The dynamics of an intruder diffusing in a granular fluid reveal the clearest connection with recent theories on stochastic energetics and stochastic thermodynamics.
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Schnee und Eis sind faszinierende Stoffe, deren mechanische Eigenschaft nur schwer zu fassen sind, insbesondere wenn sie als Lawine ins Tal stürzen. Um typische Aufgaben der alpinen Bautechnik, wie Gründungen am Eis oder Abschätzung des Schnee- oder Lawinendruckes, sorgfältig behandelt zu können, ist ein fundiertes Verständnis der dafür verwendeten mechanischen Modelle notwendig. Andernfalls können diese Modelle, wie z.B. eine Simualtionssoftware für Lawinen, nur als Black-Box verwendet werden. Dieses Buch bietet eine Einführung in Schnee-, Eis- und Lawinenmechanik. Die physikalischen Grundlagen zum Verständnis des mechanischen Verhaltens von Schnee und Eis sowie der jahreszeitlichen Veränderung von Schnee werden dargelegt. Die wesentlichen einfachen mechanischen Modelle zur Beschreibung des Materialverhaltens von Eis und Schnee werden in einer und mehreren Dimensionen eingeführt. Des Weiteren werden einfache Modelle zur Berechnung der Geschwindigkeiten und Ausbreitung von Schnee-, Geröll und Schlammlawinen eingeführt. Zusammen mit angegebenen Erfahrungswerten können damit Belastungen auf Bauwerke in Lawinenbahnen abgeschätzt werden. Die Zielgruppen - Bauingenieure - Geologen - Geographen.
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This is the 4th edition of the highly acclaimed monograph on Extended Irreversible Thermodynamics, a theory that goes beyond the classical theory of irreversible processes. In contrast to the classical approach, the basic variables describing the system are complemented by non-equilibrium quantities. The claims made for extended thermodynamics are confirmed by the kinetic theory of gases and statistical mechanics. The book covers a wide spectrum of applications, and also contains a thorough discussion of the foundations and the scope of the current theories on non-equilibrium thermodynamics. For this new edition, the authors critically revised existing material while taking into account the most recent developments in fast moving fields such as heat transport in micro- and nanosystems or fast solidification fronts in materials sciences. Several fundamental chapters have been revisited emphasizing physics and applications over mathematical derivations. Also, fundamental questions on the definition of non-equilibrium temperature, entropy, fluctuations of fluxes and boundary conditions are revisited and presented in a modern way. Detailed solutions for more than 130 problem sets presented in this book, as well as a wide bibliography on extended irreversible thermodynamics are accessible at the http://telemaco.uab.es site.
Physics. --- Thermodynamics. --- Engineering Thermodynamics, Heat and Mass Transfer. --- Soft and Granular Matter, Complex Fluids and Microfluidics. --- Statistical Physics, Dynamical Systems and Complexity. --- Nanotechnology. --- Engineering. --- Physique --- Thermodynamique --- Ingénierie --- Nanotechnologie --- Irreversible processes --- Processus irréversibles --- Processus irréversibles. --- Processus irréversibles.
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This book gathers selected papers from the Chinese Materials Conference 2018 (CMC2018) held in Xiamen City, Fujian, China, on July 12–16, 2018. The Chinese Materials Conference (CMC) is the Chinese Materials Research Society’s most important conference series and has been held annually since the early 1990s. The 2018 edition consisted of 32 domestic symposia, 2 international symposia and 1 international materials forum. This proceedings book covers the fields of advanced ceramic materials and polymer materials, and presents recent original research results from more than 300 research groups in various universities and research institutes.
Polymers. --- Surfaces (Physics). --- Ceramics, Glass, Composites, Natural Materials. --- Polymer Sciences. --- Soft and Granular Matter, Complex Fluids and Microfluidics. --- Materials Engineering. --- Characterization and Evaluation of Materials. --- Ceramics --- Physics --- Surface chemistry --- Surfaces (Technology) --- Polymere --- Polymeride --- Polymers and polymerization --- Macromolecules
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This successor to the popular textbook, “Polymer Physics” (Springer, 1999), is the result of a quarter-century of teaching experience as well as critical comments from specialists in the various sub-fields, resulting in better explanations and more complete coverage of key topics. With a new chapter on polymer synthesis, the perspective has been broadened significantly to encompass all of polymer science. Polysaccharides and proteins are included in essentially all chapters, while polyelectrolytes are new to the second edition. Cheap computing power has greatly expanded the role of simulation and modeling in the past two decades, which is reflected in many of the chapters. A supplementary chapter on basic thermodynamics is based on a course that the senior author has taught for seven years. Additional problems and carefully prepared graphics aid in understanding. Two principles are key to the textbook’s appeal: 1) Students learn that, independent of the origin of the polymer, synthetic or native, the same general laws apply, and 2) students should benefit from the book without an extensive knowledge of mathematics. Taking the reader from the basics to an advanced level of understanding, the text meets the needs of a wide range of students in chemistry, physics, materials science, biotechnology, and civil engineering, and is suitable for both masters- and doctoral-level students. Praise for the previous edition: ...an excellent book, well written, authoritative, clear and concise, and copiously illustrated with appropriate line drawings, graphs and tables. - Polymer International ...an extremely useful book. It is a pleasure to recommend it to physical chemists and materials scientists, as well as physicists interested in the properties of polymeric materials. - Polymer News This valuable book is ideal for those who wish to get a brief background in polymer science as well as for those who seek a further grounding in the subject. - Colloid Polymer Science The solutions to the exercises are given in the final chapter, making it a well thought-out teaching text. - Polymer Science.
Soft and Granular Matter, Complex Fluids and Microfluidics. --- Polymer Sciences. --- Amorphous substances. --- Complex fluids. --- Polymers . --- Polymere --- Polymeride --- Polymers and polymerization --- Macromolecules --- Complex liquids --- Fluids, Complex --- Amorphous substances --- Liquids --- Soft condensed matter
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This book provides a comprehensive and clearly structured introduction to the broad field of transducers and artificial muscles based on electromechanically active polymers (EAP), the goal being to present basic concepts and established knowledge in an accessible form. Its tutorial style and structure make this book an easy-to-use reference guide for students, researchers and practitioners alike. Different sections cover all categories of EAP materials, with separate chapters addressing the fundamentals, materials, device configurations, models, and applications, as well as operative guidelines on how to get started in experimentation with electromechanically active polymers. The functional and structural properties of EAP transducers are described and explained, and their broad range of applications in optics, acoustics, haptics, fluidics, automotive systems, robotics, orthotics, medical tools, artificial organs and energy harvesting is illustrated. Prepared under the aegis of the ‘European Scientific Network for Artificial Muscles’, the book is the product of extensive collaborative efforts led by European researchers and involving respected experts from around the globe.
Optical materials. --- Electronic materials. --- Polymers . --- Biomedical engineering. --- Mechatronics. --- Amorphous substances. --- Complex fluids. --- Engineering—Materials. --- Optical and Electronic Materials. --- Polymer Sciences. --- Biomedical Engineering and Bioengineering. --- Soft and Granular Matter, Complex Fluids and Microfluidics. --- Materials Engineering.
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This text gives a detailed account of various techniques that are used in the study of dynamics of continuous systems, near as well as far from equilibrium. The analytic methods covered include diagrammatic perturbation theory, various forms of the renormalization group and self-consistent mode coupling. Dynamic critical phenomena near a second order phase transition, phase ordering dynamics, dynamics of surface growth and turbulence form the backbone of the book. Applications to a wide variety of systems (e.g. magnets, ordinary fluids, superfluids) are provided covering diverse transport properties (diffusion, sound). It is unique in that it gives a detailed description of perturbation theory for nonlinear continuous systems, it focuses on techniques which can be applied to problems ranging from near equilibrium dynamics to fully developed turbulence, and it provides a discussion of physical properties (e.g. critical ultrasonics) that are generally not covered in text books. Audience: Beginning graduate students, senior undergraduates, researchers.
Dynamics. --- Nonlinear systems. --- Statistical physics. --- Physics --- Mathematical statistics --- Statistical methods --- Systems, Nonlinear --- System theory --- Dynamical systems --- Kinetics --- Mathematics --- Mechanics, Analytic --- Force and energy --- Mechanics --- Statics --- Complex Systems. --- Soft and Granular Matter, Complex Fluids and Microfluidics. --- Statistical Physics and Dynamical Systems. --- Dynamical systems. --- Amorphous substances. --- Complex fluids. --- Complex liquids --- Fluids, Complex --- Amorphous substances --- Liquids --- Soft condensed matter
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It is generally accepted that a new material is often developed by ?nding a new synthesis method of reaction or a new reaction catalyst. Historically, a typical example may be referred to as a Ziegler–Natta catalyst, which has allowed large-scale production of petroleum-based polyole?ns since the middle of the 20th century. New polymer synthesis, therefore, will hopefully lead to creation of new polymer materials in the 21st century. This special issue contributed by three groups focuses on recent advances in polymer synthesis methods, which handle the cutting-edge aspects of the advanced technology. The ?rst article by Yokozawa and coworkers contains an overview of the - action control in various condensation polymerizations (polycondensations). Advanced technologies enabled the control of stereochemistry (regio-, g- metrical-, and enantio-selections), chemoselectivity, chain topology, and st- chiometry of monomers, giving a high molecular weight polymer. It has been recognized for a long time, however, that polycondensation is a dif?cult p- cess in controlling the reaction pathway, because the reaction is of step-growth and the reactivity of monomers, oligomers, and polymers are almost the same during the reaction and hence, the molecular weight of polymers and its d- tribution (M /M ) are impossible to regulate. The authors’ group developed w n a new reaction system (chain-growth condensation polymerization), changing the nature of polycondensation from step-growth to chain-growth; namely the propagating chain-end is active, allowing for control of the product molecular weight as well as the distribution.
Polymerization. --- Polymerisation --- Polymers --- Polymers and polymerization --- Synthesis of polymers --- Chemical reactions --- Synthesis --- Polymers. --- Chemistry, Organic. --- Polymer Sciences. --- Soft and Granular Matter, Complex Fluids and Microfluidics. --- Organic Chemistry. --- Organic chemistry --- Chemistry --- Polymere --- Polymeride --- Macromolecules --- Polymers . --- Amorphous substances. --- Complex fluids. --- Organic chemistry. --- Complex liquids --- Fluids, Complex --- Amorphous substances --- Liquids --- Soft condensed matter
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This book deals with the formulation of the thermodynamics of chemical and other systems far from equilibrium, including connections to fluctuations. It contains applications to non-equilibrium stationary states and approaches to such states, systems with multiple stationary states, stability and equi-stability conditions, reaction diffusion systems, transport properties, and electrochemical systems. The theoretical treatment is complemented by experimental results to substantiate the formulation. Dissipation and efficiency are analyzed in autonomous and externally forced reactions, including several biochemical systems.
Chemical equilibrium. --- Thermodynamics. --- Chemistry, Physical and theoretical --- Dynamics --- Mechanics --- Physics --- Heat --- Heat-engines --- Quantum theory --- Equilibrium, Chemical --- Phase rule and equilibrium --- Chemistry, Physical organic. --- Soft and Granular Matter, Complex Fluids and Microfluidics. --- Physical Chemistry. --- Chemistry, Physical organic --- Chemistry, Organic --- Amorphous substances. --- Complex fluids. --- Physical chemistry. --- Chemistry, Theoretical --- Physical chemistry --- Theoretical chemistry --- Chemistry --- Complex liquids --- Fluids, Complex --- Amorphous substances --- Liquids --- Soft condensed matter
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