Materialer / stoffaser

This book discusses some scaling properties and characterizes two-phase transitions for chaotic dynamics in nonlinear systems described by mappings. The chaotic dynamics is determined by the unpredictability of the time evolution of two very close initial conditions in the phase space. It yields in an exponential divergence from each other as time passes. The chaotic diffusion is investigated, leading to a scaling invariance, a characteristic of a continuous phase transition. Two different types of transitions are considered in the book. One of them considers a transition from integrability to non-integrability observed in a two-dimensional, nonlinear, and area-preserving mapping, hence a conservative dynamics, in the variables action and angle. The other transition considers too the dynamics given by the use of nonlinear mappings and describes a suppression of the unlimited chaotic diffusion for a dissipative standard mapping and an equivalent transition in the suppression of Fermi acceleration in time-dependent billiards. This book allows the readers to understand some of the applicability of scaling theory to phase transitions and other critical dynamics commonly observed in nonlinear systems. That includes a transition from integrability to non-integrability and a transition from limited to unlimited diffusion, and that may also be applied to diffusion in energy, hence in Fermi acceleration. The latter is a hot topic investigated in billiard dynamics that led to many important publications in the last few years. It is a good reference book for senior- or graduate-level students or researchers in dynamical systems and control engineering, mathematics, physics, mechanical and electrical engineering.

This book presents the observation and the control of spin-polarized electrons in Rashba thin films and topological insulators, including the first observations of a weak topological insulator (WTI) and a higher-order topological insulator (HOTI) in bismuth halides. It begins with a general review of electronic structures at the solid surface and mentions that an electron spin at a surface is polarized due to the Rashba effect or topological insulator states with strong spin-orbit coupling. Subsequently it describes the experimental techniques used to study these effects, that is, angle-resolved photoemission spectroscopy (ARPES). Further it moves its focus onto the experimental investigations, in which mainly two different systems-noble metal thin films with the Rashba effects and bismuth halides topological insulators-are used. The study of the first system discusses the role of wavefunctions in spin-splitting and demonstrates a scaling law for the Rashba effect in quantum well films for the first time. High-resolution spin-resolved ARPES plays a vital role in systematically trace the thickness-evolution of the effect. The study of the latter material is the first experimental demonstration of both a WTI and HOTI state in bismuth iodide and bismuth bromide, respectively. Importantly, nano-ARPES with high spatial resolution is used to confirm the topological surface states on the side surface of the crystal, which is the hallmark of WTIs.The description of the basic and recently-developed ARPES technique with spin-resolution or spatial-resolution, essential in investigating spin-polarized electrons at a crystal surface, makes the book a valuable source for researchers not only in surface physics or topological materials but also in spintronics and other condensed-matter physics.

In diesem Buch werden zwei Berechnungsverfahren zur Berechnung von Trocknungsvorgängen an halbunendlichen längsüberströmten symmetrischen Platten beschrieben. Die Methoden unterscheiden sich in Bezug auf den Wassergehalt an der Oberfläche der Platte. Das erste Modell ¿vollständig benetzte Oberfläche¿ nimmt eine mit Wasserdampf gesättigte Luftschicht oberhalb der Flüssigkeitsschicht auf der Platte an. Daraus resultiert eine Oberfläche mit Kühlgrenztemperatur und einer konstanten Trocknungsgeschwindigkeit. Es wird von Verdunstungstrocknung gesprochen, da die Siedetemperatur nicht erreicht wird und sich der Partialdruck des Dampfes in der Luft erhöht, die Luft wird feuchter. Das zweite Modell ¿sinkender Trocknungsspiegel¿ beschreibt die Aufheizung der Gipskartonplatte in verschiedenen Schichten. Erreicht die wasserhaltige Schicht die Siedetemperatur, so verdampft das flüssige Wasser. Der Wasserverlust lässt einen fiktiven Trocknungsspiegel im Gips absinken und ändert somit die Verhältnisse der Wärmeübergänge der Karton-, trockenen und feuchten Gipsschicht, somit sinkt die Trocknungsrate über die Zeit ab. Es wird von Verdampfungstrocknung gesprochen, da der eingehende Wärmestrom die Wassermasse bei Siedetemperatur verdampft.

This book constructs a non-Bloch band theory and studies physics described by non-Hermitian Hamiltonian in terms of the theory proposed here.In non-Hermitian crystals, the author introduces the non-Bloch band theory which produces an energy spectrum in the limit of a large system size. The energy spectrum is then calculated from a generalized Brillouin zone for a complex Bloch wave number. While a generalized Brillouin zone becomes a unit circle on a complex plane in Hermitian systems, it becomes a circle with cusps in non-Hermitian systems. Such unique features of the generalized Brillouin zone realize remarkable phenomena peculiar in non-Hermitian systems. Further the author reveals rich aspects of non-Hermitian physics in terms of the non-Bloch band theory. First, a topological invariant defined by a generalized Brillouin zone implies the appearance of topological edge states. Second, a topological semimetal phase with exceptional points appears, The topological semimetal phase is unique to non-Hermitian systems because it is caused by the deformation of the generalized Brillouin zone by changes of system parameters. Third, the author reveals a certain relationship between the non-Bloch waves and non-Hermitian topology.

The Kirkwood-Buff Theory of Solutions: With Selected Applications to Solvation and Proteins presents the Kirkwood-Buff (KB) Theory of solution in a simple and didactic manner, making it understandable to those with minimal background in thermodynamics. Aside from the fact that the KB Theory may be the most important and useful theory of solutions, it is also the most general theory that can be applied to all possible solutions, including aqueous solutions of proteins and nucleic acids. Introductory chapters give readers grounding in the necessary chemical thermodynamics and statistical mechanics, but then move to a systematic derivation of Kirkwood-Buff theory and its inversion. Originally published in 1951, the KB theory was dormant for over 20 years. It became extremely useful after the publication of the "Inversion of the KB theory" by the author Arieh Ben-Naim in 1978. The book explains all necessary concepts in statistical mechanics featured in the theory in a simple and intuitive way. Researchers will find the theory useful in solving any problem in mixtures or solutions in any phase. Some examples of applications of the KB theory, to water, aqueous solutions, protein folding, and self-association of proteins, are provided in the book.

This book provides a foundational understanding of polymer dielectrics based on percolative composites. It covers the microstructure and physical properties, such as dielectric, electrical, magnetic, and rheological properties, of polymer composites, as well as how these properties can be explained using various theoretical models and spectroscopy techniques, such as dielectric spectroscopy, impedance spectroscopy, and conductivity spectroscopy. The book also discusses non-percolative polymer composites and the suitability of polymer dielectrics for electrical energy storage in various devices. It is intended for graduate students and professionals in fields such as condensed matter physics, applied physics, statistical physics, materials science, polymer science and technology, chemistry, and engineering. It will be particularly useful for physicists, materials scientists, polymer scientists, chemists, engineers, and others interested in the physics and applications of percolativecomposites based on polymer matrix.

A thorough knowledge of the physics of atoms and quanta is clearly a must for every student of physics but also for students of neighbouring disciplines such as chemistry and electrical engineering. What these students especially need is a coherent presenta- tion of both the experimental and the theoretical aspects of atomic and quantum physics. Indeed, this field could evolve only through the intimate interaction between ingenious experiments and an equally ingenious development of bold new ideas. It is well known that the study of the microworld of atoms caused a revolution of physical thought, and fundamental ideas of classical physics, such as those on measur- ability, had to be abandoned. But atomic and quantum physics is not only a fascinating field with respect to the development of far-reaching new physical ideas. It is also of enormous importance as a basis for other fields. For instance, it provides chemistry with a conceptual basis through the quantum theory of chemical bonding. Modern solid-state physics, with its numerous applications in communication and computer technology, rests on the fundamental concepts first developed in atomic and quantum physics. Among the many other important technical applications we mention just the laser, a now widely used light source which produces light whose physical nature is quite different from that of conventional lamps. In this book we have tried to convey to the reader some of the fascination which atomic and quantum physics still gives a physicist studying this field.

Since the publication of the first edition of this book, there have been many im- portant new developments in the field of molecular physics. The new methods and results which are most significant for students are treated extensively in this second edition. Among these are in particular single-molecule spectroscopy and the field of molecular electronics, which is in a stage of rapid development, including the areas of electroluminescence and organic light-emitting diodes. In addition, we have ex- tended and corrected the earlier material in a number of places. We have also included exercises in this new edition; they will allow students to deepen their understanding and offer a basis for further individual study. The complete solutions to the exercises can be found on the Internet under www. springeronline. com/3-540-40792-S. We are grateful to Mr. C. -D. Bachem and Dr. Th. Schneider of the Springer- Verlag for their continuous and very agreeable cooperation during the preparation of the book. We thank our colleague Prof. W. D. Brewer for his competent translation. Stuttgart, February 2004 H. Haken . H. C. Wolf Preface to the First Edition This textbook is intended for use by students of physics, physical chemistry, and theoretical chemistry. The reader is presumed to have a basic knowledge of atomic and quantum physics at the level provided, for example, by the first few chapters in our book The Physics of Atoms and Quanta.

For over 60 years, scientists and engineers have been trying to crack a seemingly intractable problem: how to build practical devices that exploit nuclear fusion. Access to electricity has facilitated a standard of living that was previously unimaginable, but as the world¿s population grows and developing nations increasingly reap the benefits of electrification, we face a serious global problem: burning fossil fuels currently produces about eighty percent of the world's energy, but it produces a greenhouse effect that traps outgoing infrared radiation and warms the planet, risking dire environmental consequences unless we reduce our fossil fuel consumption to near zero in the coming decades. Nuclear fusion, the energy-producing process in the sun and stars, could provide the answer: if it can be successfully harnessed here on Earth, it will produce electricity with near-zero CO2 byproduct by using the nuclei in water as its main fuel. The principles behind fusion are understood, but the technology is far from being fully realized, and governments, universities, and venture capitalists are pumping vast amounts of money into many ideas, some highly speculative, that could lead to functioning fusion reactors. This book puts all of these attempts together in one place, providing clear explanations for readers who are interested in new energy technologies, including those with no formal training in science or engineering. For each of the many approaches to fusion, the reader will learn who pioneered the approach, how the concept works in plain English, how experimental tests were engineered, the future prospects, and comparison with other approaches. From long-established fusion technologies to emerging and exotic methods, the reader will learn all about the idea that could eventually constitute the single greatest engineering advance in human history.

This book covers next-generation nanocomposite supercapacitor materials. It deals with a wide range of emerging and sustainable supercapacitors based on, e.g., low-dimensional materials including transition metal oxides, carbons, Mxenes, etc., and metal-organic frameworks. Additionally, it features up-to-date coverage of advanced supercapacitors such as 3D printing, atomic layer deposition, recycling, quantum, on-chip, shape memory, self-healing, and micro-scale supercapacitors.This book is part of the Handbook of Nanocomposite Supercapacitor Materials. Supercapacitors have emerged as promising devices for electrochemical energy storage, playing an important role in energy harvesting for meeting the current demands of increasing global energy consumption. The handbook covers the materials science and engineering of nanocomposite supercapacitors, ranging from their general characteristics and performance to materials selection, design and construction.Covering both fundamentals and recent developments, this handbook serves a readership encompassing students, professionals and researchers throughout academia and industry, particularly in the fields of materials chemistry, electrochemistry, and energy storage and conversion. It is ideal as a reference work and primary resource for any introductory senior-level undergraduate or beginning graduate course covering supercapacitors.

This book elucidates heat transfer behavior for boiling of dilute emulsions- mixtures of two immiscible fluids- which has received little attention to date. Of the work completed in this area, the majority has been focused on pool boiling where no mean flow is present, and this book is the first major work to be published regarding flow boiling of emulsions. The book includes a comprehensive review and assessment of research on emulsion-based heat transfer. Recent experiments are reported and analyzed to characterize heat transfer in microgap flow boiling via a systematic investigation into the effects of gap size, mass flux, and volume fraction on the heat transfer coefficient and pressure drop. The emulsion used in all experiments comprises droplets of an immiscible electronics cooling fluid suspended in water. The volume provides a complete baseline for flow boiling of water in the microgaps, enabling a determination of the enhancement of the heat transfer coefficient when thedisperse component is present. Moreover, a subset of the data set pertains to flow boiling of dilute emulsions over microporous surfaces. The flow conditions for which the microporous surfaces enhance or degrade heat transfer are presented. Finally, this book provides a discussion of the physical phenomena which affect boiling and a set of nondimensional numbers that can be used for correlation.

This book highlights the current state of the art in magnetophoretic circuits and their use in the emerging field of single-cell analysis. This interdisciplinary topic involves many fields of science including cellular biology, drug screening, cancer research, personalized medicine, microfabrication, biomedical microdevices, and lab-on-a-chip. This book not only provides the required fundamental knowledge and background needed in magnetics and the circuit theory but also describes the idea of magnetophoretic circuits as well as the cutting-edge developed technologies. It provides a sufficient background in i) the required theory in magnetics, ii) SCAs in general, iii) the circuit theory, iv) the developed idea of the magnetophoretic circuits, v) the fabrication process and magnetic cell labeling techniques, vi) the magnetophoretic-based SCA tools, and vii) the bio-applications. Methods for performing simulations as well as designing, fabricating, and running experiments are explained.Author of the book is one of the inventors of some of the ideas and the author/co-author of some of the related articles in high-impact journals. The book appeals to the readers interested in clinical applications as well as the ones interested in its technical aspects. It is beneficial for researchers interested in the field of single-cell analysis from various disciplines including biomedical engineering, mechanical engineering, electrical engineering, materials science, and cellular biology.

This book highlights the morphology-property relationship of regenerated cellulose materials and composites, as morphology of materials is the key feature and corresponds to associated applications of/to the materials. It is highly essential to assimilate the literature on morphology-property relationship of cellulose materials. Being the most abundant natural polymer on earth and gateway to large number of applications, cellulose is expected to be researched for higher efficiencies. Various books and research articles have targeted the specific morphologies, the respective characteristics and application areas. This book presents literature on morphology-property relationship of cellulose materials and provides a direction to this relationship. ¿

This book highlights recent advances in variety of nanomaterials classes including metal chalcogenides, metal oxides/hydroxides, polymer, metal-organic frameworks, and hybrid nanostructures, with a focus on their properties, synthesis methods, and key applications. It also offers detailed coverage on the toxicity aspects with possible solution. Additionally, it provides complete and comprehensive information on surface modification strategies of nanoparticles to achieve desired outcomes. This book discusses potential applications and major challenges of using these nanomaterials in the fields of biomedical sciences, agricultural industry, bioenergy, biofuel production, and environmental remediation, etc. Overall, this book provides crucial background in nanobiotechnology that compliments the understanding of experimental design for the production of more customized nanomaterials to avail desirable benefits.

This book presents scientific and technological innovations and advancements already developed or under development in academia, industry, and research communities. It includes fundamental ideas and advancement in terahertz technology covering high intensity terahertz wave generation, THz detection, different modes of THz wave generation, THz modulation system, and terahertz propagation channel modeling. It highlights methodologies for the design of terahertz components and system technologies including emerging applications. The chapter contents are based on theoretical, methodological, well-established, and validated empirical work dealing with different topics in the terahertz domain. The book covers a very broad audience ranging from basic sciences to experts and learners in engineering and technology. It would be a good reference for advanced ideas and concepts in THz technology which will best suit microwave, biomedical, and electrical and communication engineers working towards next-generation technology.

This book presents an analysis of the techniques used for the synthesis of innovative functional carbon nanostructures. The chapters describe the research and development of various layered carbon nanostructures. Emphasis is given to the impact of defects on carbon nanostructures. The application of carbon nanostructured materials in biomedical field and energy storage is described.

This book highlights the fundamentals for understanding the essential problems and latest progresses in basic water science. Water is the most abundant, fundamental and important matter in nature. Arguably it is also the material that human beings study the most but misunderstand the most. Compared with the environmental science and engineering research activities on water resources, water pollution and water usage closely related to social problems at the macro level, basic scientific research on water at the molecular level has just emerged, the impact of which is not fully recognized yet. This book is devoted to introducing some important advances in the field of basic water science in past decades, with a particular emphasis on recent results on water and the interactions between water and solid surfaces at the molecular level. Starting from introducing concepts and popular theoretical and experimental methods for basic water research, this book mainly focuses on the atomic composition, electronic structure, and physicochemical properties of water molecules, water clusters and water layers (including surface water layers and water surface layers), rules for water adsorption on metals, oxides, and other typical solid surfaces such as salt, as well as the microscopic processes and mechanisms of water diffusion, wetting, decomposition and phase transformations under a variety of conditions. It is a good reference book for students and researchers in water-related science.

This book brings together multiple aspects of the recent research conducted in the field of nanotechnology covering topics such as the synthesis of various nanoparticles, nanorods, graphene, graphene oxide-metal composites, characterization of these materials, and ample aspects of various applications including in heavy metal sensing, optoelectronic devices, gas sensing, solar cells, biomedical sensors, role in the drug delivery, and waste-water treatment. The book is of interest to early career researchers, who are trying to grasp multiple aspects of nanomaterials and nanocomposite synthesis and its potential applications.

This book opens the eyes of readers to the clear relationship between the molecular-sized structures and the macroscopic functions of organic devices. The discovery of novel phenomena and the mechanism of multiplied photocurrent generation in organic semiconductors, which can be applicable to amplification-type photosensors, are concisely summarized. The motivation for writing this book is to let readers know how the novel phenomena were discovered and how the novel concepts were created. The main features here include the discovery of photocurrent multiplication, the tunneling mechanism, the structural trap model, novel phenomena related to photocurrent multiplication, avalanche multiplication, and ideas for the future. This book is of interest to new and experienced scientists as well as graduate students. The author strongly hopes that the young scientists of the next generation will be enthusiastically inspired by this book and will develop the field of organic semiconductors even further.

This book highlights the versatility of graphene focusing on the background of graphene, its overall structure, superior properties, fabrication routes, characterization techniques, graphene composites/derivatives, and potential applications. A remarkable surge in interest for graphene and its applications has resulted in a substantial increase in the number of publications in terms of reviews and scientific articles, books and patents. Therefore, this book essentially addresses a wide range of graphene research and provides a great resource for beginners, students in sciences or engineering, researchers, professionals, and materials scientists. ¿

The book presents fundamentals of plasma physics with rich references and computational techniques in a concise manner. It particularly focuses on introductions to numerical simulation methods in plasma physics, in addition to those to physics and mathematics in plasma physics. It also presents the fundamentals of numerical methods, which solve mathematical models of plasmas, together with examples of numerical results. A discretization method, the so-called finite difference method, is introduced for particle-in-cell methods and fluid codes, which have been widely employed in plasma physics studies. In addition to the introduction to numerical solutions, it also covers numerical stability. The instabilities and numerical errors significantly influence the results, and for correct results, great efforts are required to avoid such numerical artifacts. The book also carefully discusses the numerical errors, numerical stability, and uncertainty in numerical computations.Readersare expected to have an understanding of fundamental physics of mechanics, electromagnetism, thermodynamics, statistical physics, relativity, fluid dynamics, and mathematics, but the book does not assume background knowledge on plasma. Therefore, it is a first book of plasma physics for upper undergraduate and early graduate students who are interested in learning it.

This book highlights the latest progress in pulsed discharge plasmas presented by front-line researchers worldwide. The science and technology surrounding pulsed discharge plasmas is advanced through a wide scope of interdisciplinary studies into pulsed power and plasma physics. Pulsed discharge plasmas with high-power density, high E/N and high-energy electrons can effectively generate highly reactive plasma. Related applications have gathered strong interests in various fields. With contributions from global scientists, the book elaborates on the theories, numerical simulations, diagnostic methods, discharge characteristics and application technologies of pulsed discharge plasmas. The book is divided into three parts with a total of 35 chapters, including 11 chapters on pulsed discharge generation and mechanism, 12 chapters on pulsed discharge characterization and 12 chapters on pulsed discharge applications (wastewater treatments, biomedicine, surface modification, and energy conversion, etc). The book is a must-have reference for researchers and engineers in related fields and graduate students interested in the subject.