Materialer / stoffaser

Lignin, found in the cell walls of trees and plants, is the second-most naturally abundant biopolymer. It is composed of alkyl-aromatic polymer units. This book describes the composition and structure of lignin, strategies for its chemical modification, and studies of biopolymer lignin. It also discusses the synthesis and characterization of lignin, methods for degradation, applications in various materials, and prospects for further development. Other topics covered include the role of lignin in thermosetting and thermoplastic materials and its technical and economic potential for generating green biofuel as an energy source for industrial plants and in the manufacture of fine chemicals.

Non-collinear spin textures have attracted significant attention due to their topological nature, emergent electromagnetic properties, and potential spintronic and magnonic device applications. This book explores the physical properties of distinct spin textures in D2d compounds. The main goals of the work are (a) discovering new spin textures in D2d Heusler compounds and studying their detailed properties to enrich the field of non-collinear magnetism (b) optimizing the nano-track geometry and generating isolated and single chains of nano-objects that will establish new hallmarks for technological applications (c) studying the stability of spin textures with magnetic fields and temperatures and finding a way to observe the striking behavior of spin textures near the specimen edges. The first few chapters provide a brief overview of spin textures such as Bloch and Neel skyrmions. In the experimental methods section, the author shows how to identify the single-crystalline grains of a polycrystalline sample, how to make single-crystalline thin specimens and nano-tracks, and then provides explicit descriptions of different imaging techniques performed on a transmission electron microscope. This part will be valuable for beginners wishing to conduct research in experimental nano-magnetism and transmission electron microscope imaging. The core results of the book are presented in four chapters, describing the discovery of several new and unanticipated spin textures, namely square-shaped antiskyrmions, elliptical Bloch skyrmions, fractional antiskyrmions, fractional Bloch skyrmions and elongated (anti)skyrmions in a single D2d Heusler compound. It is shown that these textures can be understood by a combination of dipole-dipole interactions and a chiral vector exchange that makes it possible to stabilize various spin textures even in the same compound. The D2d compounds are the first non-centrosymmetric systems shown to host several co-existing non-collinear spin textures.

Um das mechanische Verhalten von Werkstoffen einerseits besser zu verstehen und andererseits gezielt verbessern zu können, müssen die Prozesse und Mechanismen, die bei mechanischer Belastung im Material in Abhängigkeit von den Materialstrukturen ablaufen (die sog. ¿Struktur- Eigenschafts-Korrelationen¿), bekannt sein. Grundlegend sind die Prozesse auf mikro- und nanoskopischer Größenebene, d.h. im Größenbereich von 0,1 mm bis herab zu 0,1 nm (d.h. sog. Mikro- und Nanomechanik). Der Autor charakterisiert anschaulich diese mikro- und nanomechanischen Mechanismen mit aussagefähigen Schemata und Bildern auf der Grundlage hauptsächlich von elektronenmikroskopischen Analysen. Neben allgemeingültigen Prozessen und Mechanismen wird auch auf materialspezifische Effekte (z.B. Crazes, Chevrons, Dünnschichtfließen) eingegangen.Die Produktfamilie WissensExpress bietet Ihnen Lehr- und Lernbücher in kompakter Form. Die Bücher liefern schnell und verständlich fundiertes Wissen.

This textbook covers the physics of engineering materials and the latest technologies used in modern engineering projects. It has been designed for use as a reference book and course material for undergraduate engineering students. The book was born out of the need for a comprehensive, balanced, and up-to-date guide for teaching physics to beginning undergraduate engineering students and creating examination papers for technical boards and institutes. The text is divided into ten chapters, each with its specific objectives and features. The topics covered include the classification of engineering materials, atomic structure, electrical and magnetic behavior of solids, quantum mechanics, laser technology, nanomaterials, and sustainable development.Authored by a physicist with over 40 years of teaching experience, this richly-illustrated textbook features an abundance of self-assessment questions, solved examples, and a variety of chapter-end questions with detailed answers. The textbook starts from the very basics and is developed to the desired level, thus making it ideal as standalone course material.

This book is based on the 18 tutorials presented during the 30th workshop on Advances in Analog Circuit Design. Expert designers present readers with information about a variety of topics at the frontier of analog circuit design, with specific contributions focusing on analog circuits for machine learning, current/voltage/temperature sensors, and high-speed communication via wireless, wireline, or optical links. This book serves as a valuable reference to the state-of-the-art, for anyone involved in analog circuit research and development.

This book provides a concise introduction to additive manufacturing, accessible to anyone with a basic background in engineering and materials science. The author explains additive manufacturing (AM) in terms of advantages and disadvantages and gives a concise list of advantages and disadvantages, enabling readers to understand AM in relation to other techniques. Additionally, this book clarifies various contradictions with the help of numerous examples.This book:Offers readers a unique, accelerated learning tool, revealing the subtleties of Additive ManufacturingDescribes a concept for refabrication in the context of additive manufacturing, providing new insight into repair and refurbishmentDiscusses additive manufacturing not only as a design tool, but also a production tool in the context of mass-production

Scientific problems have an internal "beauty", called, referred to, precisely speaking, as their "symmetry". The symmetry arises, often, from the fact that the scientific problem refers to an object (a molecule, a crystal) and the object itself has some "symmetry" elements, but in more abstract situations, such as those arising in particle physics and quantum technologies, symmetry is often the only known (and relevant!) fact about the problem. The scope of these Lecture Notes is to educate how to recognize the symmetry of a scientific problem and how to use symmetry to understand, manipulate and, finally, solve it. The principle guiding these Lecture Notes is that "learning by doing" is the only way that young students can later become productive in science, business and industry. The lecture Notes have, essentially, two components. The first one reports the content of a set of lectures, held at ETH Zurich at the master and PhD level, frequented mainly by students from the department of Physics, Chemistry and Material Science. The lectures were accompanied by a set of student projects on various scientific subjects related to symmetry. These projects ended with a manuscript, worked out by the students themselves and edited into the second component of these Lecture Notes.

This book introduces readers to the physics governing electron emission under high voltages and temperatures, and highlights recent modeling and numerical developments for describing these phenomena. It begins with a brief introduction, presenting several applications that have driven electron emission research in the last few decades. The authors summarize the most relevant theories including the physics of thermo-field electron emission and the main characteristic parameters. Based on these theories, they subsequently describe numerical multi-physics models and discuss the main findings on the effect of space charges, emitter geometry, pulse duration, etc.Beyond the well-known photoelectric effect, the book reviews recent advanced theories on photon-metal interaction. Distinct phenomena occur when picosecond and femtosecond lasers are used to irradiate a surface. Their consequences on metal electron dynamics and heating are presented and discussed, leading to various emission regimes - in and out of equilibrium. In closing, the book reviews the effects of electron emission on high-voltage operation in vacuum, especially breakdown and conditioning, as the most common examples. The book offers a uniquely valuable resource for graduate and PhD students whose work involves electron emission, high-voltage holding, laser irradiation of surfaces, vacuum or discharge breakdown, but also for academic researchers and professionals in the field of accelerators and solid state physics with an interest in this highly topical area.

This book presents advances in the field of rare-earth (R) ¿ transition metal (M) ¿ boron compounds with extensive references. Since titanium and scandium do not form compounds with rare-earths, the Sc/Ti-M-B series are additionally presented. In each chapter the crystal structures, the complex physical properties as determined from neutron diffraction, magnetic measurements, resonance studies, transport properties and band structure calculations are critical analyzed. The models used in describing the experimental evidence are also presented. Tables with the main properties of the R-M-B compounds are given and representative data are illustrated in figures. In this way, the book provides state-of-the art knowledge and a valuable analysis of up-to-date results in the field. The technical applications, as permanent magnets, thermoelectric and magnetocaloric devices, hydrogen storage are also highlighted along with the authors insights into future directions in the field. The book is ofinterest for scientists involved in the development of the field as well as those working in the technical uses of rare-earth compounds.

This book gives a comprehensive account of modern x-ray science, based on the use of synchrotron radiation and x-ray-free electron lasers (XFELs). It emphasizes the new capabilities of XFELs which extend the study of matter to the intrinsic timescales associated with the motion of atoms and chemical transformations and give birth to the new field of non-linear x-ray science. Starting with the historical understanding of the puzzling nature of light, it covers the modern description of the creation, properties, and detection of x-rays within quantum optics. It then presents the formulation of the interactions of x-rays with atomic matter, both, from semi-classical and first-principles quantum points of view. The fundamental x-ray processes and techniques, absorption, emission, Thomson, and resonant scattering (REXS and RIXS) are reviewed with emphasis on simple intuitive pictures that are illustrated by experimental results. Concepts of x-ray imaging and diffractive imaging of atomic and nano structures are discussed, and the quantum optics formulation of diffraction is presented that reveals the remarkable quantum substructure of light. The unique power of x-rays in providing atom and chemical-bond specific information and separating charge and spin phenomena through x-ray polarization (dichroism) effects are highlighted. The book concludes with the discussion of many-photon or non-linear x-ray phenomena encountered with XFELs, such as stimulated emission and x-ray transparency.

This book presents the structure formation and dynamics of animate and inanimate matter on the nanometre scale. This is a new interdisciplinary field known as Meso-Bio-Nano (MBN) science that lies at the intersection of physics, chemistry, biology and material science. Special attention in the book is devoted to investigations of the structure, properties and dynamics of complex MBN systems by means of photonic, electronic, heavy particle and atomic collisions. This includes problems of fusion and fission, fragmentation, surfaces and interfaces, reactivity, nanoscale phase and morphological transitions, irradiation-driven transformations of complex molecular systems, collective electron excitations, radiation damage and biodamage, channeling phenomena and many more. Emphasis in the book is placed on the theoretical and computational physics research advances in these areas and related state-of-the-art experiments. Particular attention in the book is devoted to the utilization of advanced computational techniques and high-performance computing in studies of the dynamics of systems.

Das 2-bändige Lehrbuchs vermittelt anschaulich und verständlich quanten- und festkörpertheoretische Kenntnisse und Fertigkeiten und richtet sich an Studierende der Natur- und Ingenieurswissenschaften. __Band 1 Quantenmechanik. Im ersten Teil werden ausführlich sowohl Handwerkszeug als auch Methoden erläutert, um typische Eigenwertprobleme kleinster Systeme zu lösen, wie denen des Elektrons im Kasten und des H-Atoms. Wechselwirkt Strahlung mit einem Quantensystem, kann dieses mit Schwingungen oder Rotationen antworten. Auch das Phänomen des Tunneleffekt ist nun einer Beschreibung zugänglich. Dass bei der Messung einer Eigenschaft nur ein Mittelwert, bei der einer anderen dagegen ein scharfer Wert beobachtet wird, kann nun mit absoluter Sicherheit prognostiziert werden. Der Übergang von kleinsten Systemen zu größeren atomaren oder molekularen Einheiten wie dem He-Atom, dem H2+-Ion oder dem Benzol gelingt mit Näherungsverfahren, die zufriedenstellende Übereinstimmung mit den Experimenten ermöglichen, wenn auch mit hohem Rechenaufwand. In den etwa zweihundert Aufgaben werden in den Lösungen diese Methoden ausführlich erörtert. __Band 2. Festkörperphysik. Der zweiteTeil beginnt mit der Betrachtung der einzelnen Festkörperklassen und weitet den Bogen mit der thermischen Energie und optischen Phänomenen von Isolatoren. Der Schwerpunkt liegt jedoch auf Metallen und Halbleitern, wobei mit dem Modell Freier Elektronen sowohl optische wie magnetische Effekte bis hin zum Ferromagnetismus umfassend be-schrieben werden können. Bei elektrischen Eigenschaften dagegen ist eine Ausweitung dieses Modells erforderlich, das damit aber das Fenster zu den Halbleitern öffnet, deren Eigenschaften sowohl im Volumen wie an Grenzflächen untersucht werden, so dass damit ein Verständnis von Halbleiter-bauelementen ermöglicht wird, hier dargelegt an Dioden. Viele in den über hundert Aufgaben betrachteten Fragestellungen, die von ausführlichen Lösungswe-gen begleitet sind, zeigen auf, wie weitreichend die Anwendungen sind, die sich mit der erworbenen Fertigkeit in diesem Calculus erschließen lassen.

Advances in Heat Transfer, Volume 56, presents the latest in a serial that highlights new advances in the field, with this updated volume presenting interesting chapters written by an international board of authors.

The subject of this supplement to Landolt-Börnstein IV/22 Series is to present both the numerical and graphical data on the various magnetic properties of materials under pressure. Data for transition metal binary oxides MmOn [M: transition metals, O: oxygen, m, n: 1~15], MXO [M: transition metals, X: F, Cl, Br, O: oxygen] and MM¿On [M: transition metals, M¿: transition metals or non-transition metal elements, O: oxygen, n=2, 2.5, 3] ternary oxides are presented.As well known, the data-compiling principle in the Landolt-B¿rrnstein series is to choose the best reliable values from many available experimental data. The present compilation is done according to this principle.

Dieser Streifzug durch die moderne Physik gibt Einblick in einige wichtige Forschungsthemen wie z.B. Supraleitung, Gravitationswellen oder Quasikristalle. LeserInnen werden mitgenommen auf eine spannende Reise durch verschiedene Teilgebiete der Physik. Komplexe Zusammenhänge werden dabei anschaulich aufbereitet, sodass sowohl Studienanfänger als auch Fachfremde ohne ein tieferes Formelverständnis einen Überblick erhalten. Dabei wird sowohl die experimentelle als auch die theoretische Seite der Forschung beleuchtet, um ein möglichst authentisches Bild von dieser lebendigen und auch für die technologische Entwicklung unverzichtbaren Wissenschaft zu zeichnen. Die aktualisierte Neuauflage enthält zusätzliche Kapitel zu Laser und Mikroskopie.

The lack of effective DC fault protection technology remains a major barrier for the DC paradigm shift. In addressing the key challenges, Direct Current Fault Protection: Basic Concepts and Technology Advances starts with an introduction to the advantages of DC power systems before moving on to an in-depth review of DC fault protection technologies, including mechanical circuit breaker (MCB), solid-state circuit breaker (SSCB), hybrid circuit breaker (HCB), converter based (breakerless) protection, and fault current limiter (FCL). Coverage includes a comprehensive comparison of various DC fault interruption technologies and their suitable applications, state-of-the-art DC fault protection concepts and advances in research, identification of fundamental challenges and future directions in the field, and commercialization aspects. This book will be a valuable reference for practicing engineers, researchers, and graduate students in the field of power electronics andDC power systems.

This books presents a brief review of modern concepts of the Sun-Earth problem and proposed physical mechanisms of solar-terrestrial relations (STR). This field covers a wide range of fundamental and actual applied problems of paramount importance (Space Weather, radiation hazard in space, functioning of space-borne and ground-based technological systems, heliobiology etc.). It is also closely tied with some general gnosiological problems.The author provides state-of-the-art information about existing problems and discusses different channels for extraterrestrial influences at the up-to-date level: electromagnetic waves and fields, total solar irradiance, solar wind, energetic solar particles, galactic cosmic rays, cosmic dust, etc. Some of the well-known and suggested STR effects and corresponding physical mechanisms are illustrated by several examples. In particular, a number of different external ¿signals¿ in observed changes of terrestrial climate and weather are considered. Especially, an expected impact of geophysical disturbances on the accuracy of some precise physical measurements and experiments is analysed. Due attention is paid to the heliobiological aspects of STR. Particular emphasis is on the multifactor nature of magneto-biological effect (MBE), its non-stationary and non-linear behaviour. The author also discusses main features of different physical mechanisms (electromagnetic fields, ionising radiation, triggers, rhythmic and resonances in solar-terrestrial systems) and their applicability to the Sun-Earth problem. The most of them are still needed in more sophisticated theoretical development and experimental confirmation. The main goals of interdisciplinary studies in this field are to determine partial impacts of solar-geomagnetic variability on the terrestrial environments and estimate (separate) relative contributions of different factors into various STR phenomena.The book is based on lectures given on advanced undergraduate leveland will also benefit newcomers (physicists and engineers) to the field.

There are growing advantages to the use of graphene-based nanophotonics in communication, sensing, security, safety, spectroscopy, manufacturing, biomedicine, agriculture, imaging, and other fields. These advantages, as well as the numerous challenges associated with this technology and proposed solutions to these challenges, are summarized in this book. The key objective of the book is to serve as a single-source reference for the rapidly expanding application aspects of the technology of graphene-based nanophotonics, as well as the number of modules required for their successful implementation. This book seeks to give readers a comprehensive understanding of several elements of graphene-based nanophotonics, such as emerging application areas, the design and modelling of sensors, absorbers, optical fiber, encoders, etc. A complete view of the progress and breakthroughs in novel materials for sensing, detecting and encoding technology is presented. The book also emphasizes theconsequences of THz signals on human health, as well as the environmental components of THz. This book will be of tremendous value for those with an interest in electronic engineering, particularly those keeping an eye on this emerging technology.

Since its advent, nanotechnologies are considered key enabling technologies that take advantage of a wide array of nanomaterials (NMs) for biomedical and industrial applications generating significant societal and economic benefits. However, such innovation increases human exposure to these substances through inhalation, ingestion or dermal contact raising public health concerns. Furthermore, the NMs' specific physicochemical properties, that confer them unique beneficial characteristics, can also elicit nano-bio interactions leading to toxicity and concerns for public health. In addition, such properties can be affected by the surrounding matrix, particularly when incorporated in complex matrices such as food products, leading to secondary features potentially more relevant than primary characteristics for determining their toxicological outcome. These nano specific issues raise the question of whether the NMs may produce adverse outcomes that are not accounted for when using conventional toxicological approaches to assess their safety.Such uncertainties about the safety of NMs for human health and the environment may hamper a faster and more widespread exploration of their potentials. In response, the NMs definition has evolved, and nanotoxicology has developed towards new and more integrative approach methods to support regulatory and policy actions.This book provides a perspective on recent developments in the synthesis, application, and characterization of NMs and the related nanotechnologies, focusing on nanotoxicology for their accurate safety assessment early in the product development stage. The use of complex in vitro models, including multicellular systems and organoids, and "e;omics-based"e; approaches, such as transcriptomics or epigenomics, have greatly contributed to an in-depth understanding of the cellular and molecular mechanisms behind some NMs toxicity. Such mechanistic knowledge is equally addressed in this book and has set the basis for a predictive nanotoxicology approach building on adverse outcome pathways. In addition, considering the knowledge provided by the above-mentioned approaches, insights into risk assessment, standardization, and regulation of NMs are also included.Incorporating adequate nanosafety assessment early in the life-cycle of NMs will allow the implementation of the safe and sustainable-by-design paradigm enabling safety to keep pace with innovation.Chapters 10 and 15 are available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.

This book presents experimental as well as simulation methodologies for analysis and development of nanostructures for introducing the desirable effects through modifications in the basic structure of select nanomaterials. The initial chapters in this book focus on exploring the basic aspects of nanomaterials, e.g., distinguishing features, synthesis, processing, characterization, simulation and application dimensions, or nanostructures that enable novel/enhanced properties or functions. The chapters also cover the size-dependent electronic, optical, and magnetic properties of nanomaterials in exposing the specific properties essential for applications in nanophotonics, nanoplasmonics, nanosystems (e.g., biological, medical, chemical, catalytic, energy, and environmental applications), and nanodevices (e.g., electronic, photonic, magnetic, imaging, diagnostic, and sensor applications). This book is a useful resource for students, researchers, and technologists in gathering recent knowledge on novel nanostructures and their use in different application areas.

This book describes in detail the semiconductor physics and the effects of the high temperatures and ionizing radiations in the electrical behavior of the Metal-OxideSemiconductor Field Effect Transistors (MOSFETs), implemented with the first and second generations of the differentiated layout styles. The authors demonstrate a variety of innovative layout styles for MOSFETs, enabling readers to design analog and RF MOSFETs that operate in a high-temperature wide range and an ionizing radiation environment with high electrical performance and reduced die area.

¿Mangalyaan was launched on November 5, 2013, to Mars by Indian Space Research Organization (ISRO). On October 2, 2022, ISRO declared that Mangalyaan had lost communications with Earth. Mars Color Camera (MCC) on-board Mangalyaan has taken thousands pictures of Mars. A full disk of Mars image observed by Viking is shown on the cover page of this book. Mars is covered by the dust as observed by Mangalyaan (from Arya et al., 2015). This book presents the atmospheric and ionospheric results obtained from all missions to Mars. It also covers various atmospheric and ionospheric models of Mars. Broadly speaking, the planet¿s atmosphere can be divided into two regions: lower and upper. These two regions can be coupled due to the propagation of energy from the lower to the upper atmosphere. The first-ever book on the aeronomy of Mars, this work is intended to help students and researchers familiarize themselves with the field of aeronomy. In addition, it helps planetary probe designers, engineers, and other users in the scientific community, e.g., planetary geologists and geophysicists¿.

This book includes problems based on the material in the course of physical kinetics for the students of general and applied physics. It contains 60 problems with detailed solutions. The comments to the problems reflect the connection with the problems and methods of modern physical kinetics. A brief introduction gives the necessary information for solving and understanding the problems. The book is proposed for students and postgraduates studying the theoretical physics. The book is used as a supplement to the textbooks published on physical kinetics. The purpose of the book is to help students in training the practical skills and mastering the basic elements of physical kinetics. To understand the subject matter, it is sufficient to know the traditional courses of theoretical physics.

This book focuses on recent developments in the field of two-dimensional nanomaterials for environmental applications. Due to their high surface area and tunable surface chemistry, two-dimensional nanomaterials are currently garnering great interest for environmental remediation applications. This book compiles contributed chapters from active international researchers dealing with the development of state-of-the-art two-dimensional nanomaterials in environmental applications such as water and wastewater treatment, adsorption, photocatalysis, membrane separation, desalination, deionization, environmental pollutants sensing/detection, carbon-dioxide capture and catalytic conversion, microbial treatment, and electrochemical remediation. Each chapter provides an essential and comprehensive overview of the recent advances in material development and application, giving special attention to preparation methods, tunning of physiochemical properties, surface and interface chemistry, structural porosity, assemblies integration for fabrication of devices, and their relationship with overall efficiency. It offers a valuable reference guide for environmental and materials scientists, engineers, and policymakers working towards environmental sustainability.