Aimed at graduate students, this textbook provides an accessible and comprehensive introduction to operator theory. Rather than discuss the subject in the abstract, this textbook covers the subject through twenty examples of a wide variety of operators, discussing the norm, spectrum, commutant, invariant subspaces, and interesting properties of each operator. The text is supplemented by over 600 end-of-chapter exercises, designed to help the reader master the topics covered in the chapter, as well as providing an opportunity to further explore the vast operator theory literature. Each chapter also contains well-researched historical facts which place each chapter within the broader context of the development of the field as a whole.
This study presents an overview of the wooden furniture that has come to light since the rediscovery of Herculaneum in the 18th century, with an emphasis on the form, function and the techniques employed. The combination of comments in the excavation reports with the information derived from the surviving pieces of furniture and fittings made of other materials as well as indications for the presence of furniture in the architecture and decoration of the houses, offers a representative idea of the role of wooden furniture in the interior arrangements of the houses at Herculaneum.
One of the main aims of management accounting is to provide managers with accurate information in order to provide a good basis for decision-making. There is evidence that the information provided by management accounting systems (MAS) is distorted and the occurrence of biases in accounting information is widely accepted among users of MAS. At the same time, the intensity and the frequency of use of MAS increase, too. Consequently, the quality of the provided information is critical. The focus of this simulation study is twofold. On the one hand, the impact of the sophistication of traditional costing systems on error propagation in the case of a set of input biases is investigated. On the other hand, the impact of single and multiple input biases on the quality of the information provided by traditional costing systems is focused. In order to investigate the research questions, a simulation approach is applied.
Keukeleire and Delreux demonstrate the scope and diversity of the European Union's foreign policy, showing that EU foreign policy is broader than the Common Foreign and Security Policy and the Common Security and Defence Policy, and that areas such as trade, development, environment and energy are inextricable elements of it. This book offers a comprehensive and critical account of the EU's key foreign relations – with its neighbourhood, with the US, China and Russia, and with emerged powers – and argues that the EU's foreign policy needs to be understood not only as a response to crises and conflicts, but also as a means of shaping international structures and influencing long-term processes. This third edition reflects recent changes and trends in EU foreign policy as well as the international context in which it operates, addressing issues such as the increasingly contested international order, the conflict in Ukraine, the migration and refugee crisis, Brexit and Covid-19. The book not only clarifies the formal procedures in EU foreign policy-making but also elucidates how it works in practice. The third edition includes new sections and boxes on 'strategic autonomy', European arms exports, the EU's external representation, the 'Brussels Effect', and decentring and gender approaches to EU foreign policy. Up to date, jargon-free and supported by its own website (eufp.eu), this systematic and innovative appraisal of this key policy area is suitable for undergraduate and postgraduate students, as well as practitioners.
Written by a leading expert on the electromagnetic design and engineering of superconducting accelerator magnets, this book offers the most comprehensive treatment of the subject to date. In concise and easy-to-read style, the author lays out both the mathematical basis for analytical and numerical field computation and their application to magnet design and manufacture. Of special interest is the presentation of a software-based design process that has been applied to the entire production cycle of accelerator magnets from the concept phase to field optimization, production follow-up, and hardware commissioning. Included topics: Technological challenges for the Large Hadron Collider at CERN Algebraic structures and vector fields Classical vector analysis Foundations of analytical field computation Fields and Potentials of line currents Harmonic fields The conceptual design of iron- and coil-dominated magnets Solenoids Complex analysis methods for magnet design Elementary beam optics and magnet polarities Numerical field calculation using finite- and boundary-elements Mesh generation Time transient effects in superconducting magnets, including superconductor magnetization and cable eddy-currents Quench simulation and magnet protection Mathematical optimization techniques using genetic and deterministic algorithms Practical experience from the electromagnetic design of the LHC magnets illustrates the analytical and numerical concepts, emphasizing the relevance of the presented methods to a great many applications in electrical engineering. The result is an indispensable guide for high-energy physicists, electrical engineers, materials scientists, applied mathematicians, and systems engineers.
Following their occupation by the Third Reich, Warsaw and Minsk became home to tens of thousands of Germans. In this exhaustive study, Stephan Lehnstaedt provides a nuanced, eye-opening portrait of the lives of these men and women, who constituted a surprisingly diverse population—including everyone from SS officers to civil servants, as well as ethnically German city residents—united in its self-conception as a “master race.” Even as they acclimated to the daily routines and tedium of life in the East, many Germans engaged in acts of shocking brutality against Poles, Belarusians, and Jews, while social conditions became increasingly conducive to systematic mass murder.
Among Asian languages, Tibetan is second only to Chinese in the depth of its historical record, with texts dating back as far as the eighth and ninth centuries, written in an alphabetic script that preserves the contemporaneous phonological features of the language. The Classical Tibetan Language is the first comprehensive description of the Tibetan language and is distinctive in that it treats the classical Tibetan language on its own terms rather than by means of descriptive categories appropriate to other languages, as has traditionally been the case. Beyer presents the language as a medium of literary expression with great range, power, subtlety, and humor, not as an abstract object. He also deals comprehensively with a wide variety of linguistic phenomena as they are actually encountered in the classical texts, with numerous examples of idioms, common locutions, translation devices, neologisms, and dialectal variations.
Written by well-respected experts, this how-to guide provides patterns for the design of human computer human interaction (HCHI). An increasing number of applications are currently designed for use by more than one user, eg: multi-player games, interactive web sites, mobile phones, collaborative learning systems, interactive workspaces and smart environments. In these areas there is a shift from (HCI) human computer interaction to (HCHI) human computer human interaction. The role of patterns in this movement is twofold: 1st – patterns focus on the human user of the system; 2nd – patterns assist developers in the development process of groupware applications.
An accessible introduction to the principles of computational and mathematical modeling in psychology and cognitive science This practical and readable work provides students and researchers, who are new to cognitive modeling, with the background and core knowledge they need to interpret published reports, and develop and apply models of their own. The book is structured to help readers understand the logic of individual component techniques and their relationships to each other.
Twelve-tone and serial music were dominant forms of composition following World War II and remained so at least through the mid-1970s. In 1961, Ann Phillips Basart published the pioneering bibliographic work in the field.
This textbook on urban ecosystems answers important questions about the ecological structure, functions and socio-ecological development of cities worldwide. Based on how cities are developing today in an increasingly urbanized world, it explains ecological challenges for cities of the 21st century such as resource efficiency, climate change, moderation of quality of life and resilience. The book combines theories of urban development and ecology with practical applications and case studies, thus identifying potential for improvement and examples of good ecological urban development worldwide. It shows that cities are by far not only problem areas but also offer great potential for a good life and that the various urban ecosystems can make a considerable contribution to this. The "eco-city" is thus not a utopia,but a real goal that can be pursued step by step in a targeted manner, taking into account the local and regional context. Four renowned urban ecologists have contributed their specific experience in sub-areas without losing sight of the big picture. Jürgen Breuste is an urban ecologist and works at the Paris Lodron University in Salzburg, Austria, on the topics of sustainable urban development, urban biodiversity, ecosystem services and eco-cities. Dagmar Haase is Landschaftsökologin and works at the Humboldt University of Berlin on urban ecosystem services and land use modeling. Stephan Pauleit is a landscape planner and works at the Technical University of Munich on strategies for the sustainable development of urban landscapes. Martin Sauerwein is a geographer and works at the University of Hildesheim on geo-ecology in cultural landscapes, geoarchaeology and soil protection. The textbook addresses a broad audience of students, teachersand also to practitioners in the fields of ecology, urban ecology, urban development, sustainability, urban geography, nature and landscape conservation, spatial planning, landscape ecology, social sciences and urban studies. The numerous photos and graphics, many of them in four colors, as well as clear tables illustrate the facts. Case studies, examples and explanations allow a deeper insight. Questions at the end of each chapter allow the progress of knowledge to be checked, and a comprehensive bibliography for each chapter provides further studies.This book is a translation of the original German 1st edition Stadtökosysteme by Jürgen Breuste published by Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2016. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors. This springer essential is a translation of the original German 1st edition essentials,Stadtökosysteme by Jürgen Breuste published by Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2016. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors.
The author, S. Hüfner, presents an authoritative and up-to-date introduction to the field by comprehensively treating the electronic structures of atoms, molecules, solids, and surfaces. Brief descriptions are given of inverse photoemission, spin-polarized photoemission and photoelectron diffraction. Experimental aspects are considered throughout the third edition book and the results are carefully interpreted in terms of the theory. A wealth of measured data is presented in tabulator form for easy use by experimentalists. The reader will learn about the basic technique of photoemission spectroscopy and obtain the necessary background for work based on this book.
Forestry has long been in a rather favourable position in offering a valuable raw material source in high demand. However, with rapidly changing end-user demands and cost competitiveness within the forest and wood chain as a whole, the industry is needing to adapt. Explaining entrepreneurial action as part of a chain of comprehensive value-added processes leads to a new perception of forest production and wood processing. This book applies the main concepts of modern managerial science to the world of forestry and is the perfect book for students studying forestry and wood processing, as well as entrepreneurs and managers within the sector. Topics are covered from an entrepreneurial perspective and include perspectives from accounting, finance, economics, supply chain management, marketing and strategy.
The study of model spaces, the closed invariant subspaces of the backward shift operator, is a vast area of research with connections to complex analysis, operator theory and functional analysis. This self-contained text is the ideal introduction for newcomers to the field. It sets out the basic ideas and quickly takes the reader through the history of the subject before ending up at the frontier of mathematical analysis. Open questions point to potential areas of future research, offering plenty of inspiration to graduate students wishing to advance further.
The book starts with the required results in parametric nonlinear optimization. This is followed by the main theoretical results including necessary and sufficient optimality conditions and solution algorithms for bilevel problems. Stationarity conditions can be applied to the lower level problem to transform the optimistic bilevel programming problem into a one-level problem. Properties of the resulting problem are highlighted and its relation to the bilevel problem is investigated. Stability properties, numerical complexity, and problems having additional integrality conditions on the variables are also discussed
Do you want to pick up a light saber whenever you hear John Williams' Star Wars theme? Get the urge to ride into the desert and face down steely-eyed desperados to the refrain of Ennio Morricone's The Good, the Bad and the Ugly? Does Hans Zimmer's Pirates of the Caribbean score have you talking like Jack Sparrow? From the Westerns of the 1960s to current blockbusters, composers for both film and television have faced new challenges--evermore elaborate sound design, temp tracks, test audiences and working with companies that invest in film score recordings all have led to creative sparks, as well as frustrations. Drawing on interviews with more than 40 notable composers, this book gives an in-depth analysis of the industry and reveals the creative process behind such artists as Klaus Badelt, Mychael Danna, Abel Korzeniowski, Walter Murch, Rachel Portman, Alan Silvestri, Randy Thom and others.
Three radical perspectives on the critique of capitalism For years, the critique of capitalism was lost from public discourse; the very word “capitalism” sounded like a throwback to another era. Nothing could be further from the truth today. In this new intellectual atmosphere, Sociology, Capitalism, Critique is a contribution to the renewal of critical sociology, founded on an empirically grounded diagnosis of society’s ills. The authors, Germany’s leading critical sociologists—Klaus Dörre, Stephan Lessenich, and Hartmut Rosa—share a conviction that ours is a pivotal period of renewal, in which the collective endeavour of academics can amount to an act of intellectual resistance, working to prevent any regressive development that might return us to neoliberal domination. The authors discuss key issues, such as questions of accumulation and expropriation; discipline and freedom; and the powerful new concepts of activation and acceleration. Their politically committed sociology, which takes the side of the losers in the current crisis, places society’s future well-being at the centre of their research. Their collective approach to this project is a conscious effort to avoid co-optation in the institutional practices of the academy. These three differing but complementary perspectives serve as an insightful introduction to the contemporary themes of radical sociology in capitalism’s post-crisis phase.
NEW YORK TIMES BESTSELLER • “Talty’s vigorous history of seventeenth-century pirates of the Caribbean [is] a pleasure to read from bow to stern.”—Entertainment Weekly “In Stephan Talty’s hands, the brilliant Captain Morgan, wicked and cutthroat though he was, proves an irresistible hero. . . . A thrilling and fascinating adventure.”—Caroline Alexander, author of The Endurance and The Bounty The passion and violence of the age of exploration and empire come to vivid life in this story of the legendary pirate who took on the greatest military power on earth with a ragtag bunch of renegades. Awash with bloody battles, political intrigues, natural disaster, and a cast of characters more compelling, bizarre, and memorable than any found in a Hollywood swashbuckler, Empire of Blue Water brilliantly re-creates the life and times of Henry Morgan and the real pirates of the Caribbean.
The United Nations' development co-operation has often been criticized in the past; many shortcomings can indeed be identified. However, efforts to overcome the existing problems have been stepped up. A key role in the reform of the UN in this area is played by the United Nations Development Programme (UNDP). This study is intended as a constructive contribution to the current debate on the reform of UN development co-operation. It analyses both the main weaknesses of UN development co-operation as a whole and the reforms that have so far been undertaken. On this basis it identifies the areas in which further efforts are needed if the UNDP is to become more effective.
Um die komplexe Physik in kompressiblen Strömungen genauer zu verstehen, kommen vermehrt Simulationen zum Einsatz. Jedoch können weit verbreitete kommerzielle Softwarepakete die Physik aufgrund ihrer niedrigen Genauigkeit oft nicht korrekt erfassen. In dieser Arbeit wird eine diskontinuierliche Galerkin Methode mit hoher Ordnung entwickelt, welche eine hohe Genauigkeit erzielt. Dabei werden insbesondere zwei Probleme, die im Kontext von Verfahren mit hoher Ordnung auftreten, behandelt. Zum einen wird die Gittergenerierung durch das Verwenden einer Immersed Boundary Methode deutlich vereinfacht. Dies bedeutet, dass die Problemgeometrie aus einem deutlich einfacheren Hintergrundgitter herausgeschnitten wird. Die Geometrie wird mit Hilfe einer Level-Set Funktion dargestellt, und die Integration auf den entstehenden geschnittenen Zellen wird mittels einer hierarchischen Moment-Fitting Quadratur durchgeführt. Das Problem der sehr kleinen oder stark gekrümmten Zellen wird durch Zellagglomeration gelöst. Zum zweiten wird die starke Zeitschrittbeschränkung durch anisotrope Gitter mit Hilfe eines lokalen Zeitschrittverfahrens behoben. Diverse numerische Experimente bestätigen die hohe Genauigkeit, Effizienz und geometrische Flexibilität der vorgestellten Methode.
At the height of the Vietnam War, Lt. Colonel Gene Hambleton's memory was filled with highly classified information that the Soviets and North Vietnamese badly want. When Hambleton was shot down in the midst of North Vietnam's Easter Offensive, US forces placed the entire war on hold to save a single man hiding amongst 30,000 enemy troops and tanks. After other missions fail, Navy SEAL Thomas Norris and his Vietnamese guide, Nguyen Van Kiet, volunteer to go in on foot. Talty describes the riveting story of one of the greatest rescue missions in the history of the Special Forces. -- adapted from jacket
Examining how migrants appropriate mobility in the context of biometric border controls, this volume mobilises new analytics and empirics in the debates about the politics of migration and provides an analytically effective and politically significant tool for the study of contemporary migration. Drawing from the tension between the EU’s attempt to achieve watertight border controls by means of biometric technologies, and migrants’ persistence to move to and live in the EU, the volume pursues two interrelated objectives: first, it studies the encounters between migrants and the Visa Information System (VIS), one of the largest biometric databases in the world, from the perspective of mobility in order to investigate how migrants appropriate mobility via Schengen visa within and against this biometric border regime. Second, it addresses criticisms of autonomy of migration in order to develop it as a viable approach for border, migration and critical security studies. Hence, the book is driven by two interrelated research questions: what does the assertion of moments of autonomy of migration refer to in the context of border regimes that use biometrics to turn migrants’ bodies into a means of mobility control? And how do migrants appropriate mobility via Schengen visa within and against biometric border regimes? This book will be of great interest to scholars in border, migration and critical security studies, as well as researchers engaged in citizenship studies, surveillance studies, political theory, critical IR theory and international political sociology.
This book describes recent theoretical findings relevant to bilevel programming in general, and in mixed-integer bilevel programming in particular. It describes recent applications in energy problems, such as the stochastic bilevel optimization approaches used in the natural gas industry. New algorithms for solving linear and mixed-integer bilevel programming problems are presented and explained.
This prospective, randomized, double-blind investigation evaluated the influence of a short-time artificial change of occlusion to the upper cervical spine mobility. Twenty 14-19 aged female dancers were investigated in a cross-over-design on head movement rotation in anteflexion with a three-dimensional ultrasonic measurement device, the Zebris 3D Motion Analyzer (CMS 70 P). A change of the occlusion was produced by positioning a 0.75mm foil of tin between premolar and first molar of the right side. Towards the current theory of convergence of cervical and trigeminal nerves the change of occlusion should enlarge tensions in the suboccipital muscles and consequently decrease the mobility of the upper spine. The results of this investigation are: There were no significant differences in measuring movements of the upper cervical spine in dependence of changes of the occlusion. Assessments of the probationers to the changes in tension or motion support these results.
This book aims to present the history and developments of particle physics from the introduction of the notion of particles by the Ionian school until the discovery of the Higgs boson at LHC in 2012. Neutrino experiments and particle accelerators where different particles have been discovered are reviewed. In particular, details about the CERN accelerators are presented. This book also discusses the future developments of the field and the work to popularize high energy physics. A short presentation of some features of astrophysics and its connection to particle physics is also included. At the end of the book, some useful tools in the research of particle physics are given for the advanced readers.
In recent years, kesterite Cu2ZnSnS4 (CZTS) has become an interesting alternative to copper indium gallium (di)selenide (CIGS) due to its non-toxic and earth abundant constituents. A variety of methods is being used to fabricate kesterite thin films, such as coevaporation, sputtering, electrodeposition, spray pyrolysis and others. Most of them include an annealing step to stimulate elemental mixing and interdiffusion. Although conversion efficiencies of kesterite solar cells have increased among different research groups, the record value of 12.6% set by IBM in 2014 has not been broken yet. Therefore, experimental and theoretical studies are needed to predict the effect of the secondary phases and detrimental defects on the electronical properties of the CZTS based solar devices. The work presented here studies non-destructive techniques for in situ process control and monitoring. With the aim to detect phases and phase transitions to optimize crucial processing steps such as pre-annealing of metal precursors, high temperature annealing and vacuum deposition of Cu-Sn-Zn-S based thin films. The research consists of three parts in which Raman spectroscopy, X-ray diffraction (XRD) and reflectometry are used to explore this objective. In the first part Raman spectroscopy is investigated as an in situ monitoring technique during high temperature annealing of thin films. It investigates whether the occurrence of CZTS can be monitored when it is created from annealing a Mo/CTS/ZnS layered thin film. CuS, SnS, ZnS and CTS (Cu-Sn-S) films are prepared by physical vapor deposition. The Raman scattering intensity was compared to investigate whether their specific vibrational modes can be distinguished from each other at room temperature. Then, the CTS film is annealed between 50 and 550 °C in order to investigate whether CTS vibrational modes can be identified at elevated temperatures and to see which transitions take place within the thin film. Also, a CZTS reference film is annealed between 50 and 550 °C for reference purposes. The temperature dependence of the main CZTS modes is examined to investigate whether it can be used for in situ temperature control. Finally, a ZnS layer is deposited on the unannealed CTS film to obtain a Mo/CTS/ZnS layered film. This film is used to study the conversion of CTS/ZnS into CZTS at elevated temperatures. It was found that Raman spectroscopy can successfully be used to monitor formation of CZTS by identifying its main vibrational mode during the annealing process. The intensity of the CTS modes reduces at elevated temperatures. At 450 °C, the main CZTS mode at 338 cm-1 can be clearly identified. The second part also focuses on high temperature annealing. However, in this part the focus lies on annealing of the metal precursor films. It is explored whether specific alloys benefit or hinder the formation of secondary phases during formation of the CZTS absorber films. Also, to what extent this influences solar cell performance. In situ XRD was investigated for in situ monitoring of the pre-annealing process. Cu-poor metal precursor films are prepared by sputtering deposition. The precursors are annealed at 150 °C, 200 °C, 300 °C and 450 °C in a three zone tube furnace. The effect on the structural properties is analysed by XRD to study the formation mechanism of alloys. The precursor films are then sulfurized in a three zone tube furnace. The structural properties of the absorber are analysed and correlated with structures in the precursor. It is found that formation of SnS2 in the absorber is proportional to the remaining Sn in the pre-annealed precursor. Also, electron micrographs showed that pre-annealing temperature influences grain growth and surface precipitation of Sn-S and Zn-S. Pre-annealed absorbers at 450 °C did not exhibit these phases on the surface. Solar devices are fabricated from the absorber films and best performing devices were obtained from pre-annealed absorbers at 450 °C. They showed absence of Sn and SnS2 in, respectively, the precursor and absorber. It could be concluded that SnS2 phases are detrimental to device efficiency and that SnS2 XRD peak intensity follows an inverse proportionality with device efficiency. The third part explores reflectometry as a method to monitor a growing film during thermal evaporation in a physical vapor deposition (PVD) system. A set of six CZTS absorbers is examined by ex situ Raman spectroscopy and reflectometry to study the influence of secondary phases CuS and ZnS on reflection spectra. Composition strongly influences reflection spectra and CuS leaves a characteristic dip in the reflection spectrum at about 600 nm. An integration method was used to analyze this phenomenon quantitatively. Subsequently, a reflectometry setup is designed, developed and integrated in the PVD system. Four different CZTS co-evaporated and multi-layered films are deposited. Structural, morphological and vibrational properties are investigated. The reflection spectra are monitored during deposition and time-dependent reflection spectra are analyzed for characteristic aspects related to properties such as thickness, band gap and phase formation. CuS could not be detected in the films by the integration method due to the superposition of the CuS dip with developing interference fringes during film growth. However, in multilayered CTS/ZnS film it is found that the onset of ZnS deposition can be detected by increased reflection intensity due to reduced surface roughness. Additionally, the shifting onset of the interference fringes to lower photon energies can be used as a characteristic fingerprint during the deposition process. In conclusion, this work showed that Raman spectroscopy, XRD and reflectometry could be successfully implemented for in situ process control and monitoring of high temperature annealing and vacuum deposition of Cu-Sn-Zn-S based precursors and absorbers. The application of these in situ techniques can lead to the optimization of thin film material properties and solar cells. As such, this study has paved the way for further improvement of Cu-Sn-Zn-S based precursors and thin film absorbers. Innerhalb der letzten Jahre hat sich Kesterit Cu2ZnSnS4 (CZTS) aufgrund seiner ungiftigen Bestandteile und deren hoher Verfügbarkeit zu einer interessanten Alternative zu Kupfer Indium Gallium (di-)Selenid (CIGS) entwickelt. Zur Herstellung von Kesterit Dünnschichten wird eine Vielzahl von Methoden verwendet wie Ko-Verdampfung, Sputtern, Elektrodeposition, Spray Pyrolyse und andere. Die meisten davon beinhalten einen Temper-Schritt um die Durchmischung und Interdiffusion der Elemente zu stimulieren. Obwohl der Wirkungsgrad der Kersterit Solarzellen von verschiedenen Forschungsgruppen erhöht wurde, ist der Rekordwert von IBM von 12,6 % noch nicht gebrochen worden. Daher werden experimentelle und theoretische Studien benötigt, die den Einfluss von Fremdphasen und schädlichen Defekten auf die elektronischen Eigenschaften der CZTS Solarzellen vorhersagen. Die vorliegende Arbeit untersucht zerstörungsfreie Methoden für die in situ Prozesskontrolle und -überwachung. Dabei ist das Ziel, entscheidende Prozessschritte wie das Vortempern der Metall-Vorläufer sowie das Hochtemperatur-Tempern und die Vakuum-Abscheidung von Cu-Sn-Zn-S basierten Schichten zu optimieren. Die Untersuchung besteht aus drei Teilen, in denen Raman-Spektroskopie, Röntgendiffraktion (XRD) und Reflektometrie benutzt werden um dieses Ziel zu erreichen. Im ersten Teil wird die Ramanspektroskopie als in situ Methode zur Überwachung des Hochtemperatur-Temperns von Dünnschichten betrachtet. Es wird untersucht, ob das Entstehen von CZTS beim Tempern von gestapelten Mo/CTS/ZnS Dünnschichten beobachtet werden kann. CuS, SnS, ZnS und CTS (Cu-Sn-S) Schichten werden durch physikalische Gasabscheidung hergestellt. Die Intensität der Raman Streuung wurde vergleichen um zu untersuchen, ob die spezifischen Vibrations-Moden bei Raumtemperatur voneinander unterschieden werden können. Dann werden die CTS Schichten zwischen 50 °C und 550 °C getempert um zu untersuchen, ob die CTS Vibrations-Moden bei höheren Temperaturen identifiziert werden können und um festzustellen, welche Übergänge innerhalb der Schicht auftreten. Außerdem wurde eine CZTS Referenzschicht zwischen 50 °C und 550 °C für Referenzzwecke getempert worden. Die Temperaturabhängigkeit der CZTS Haupt-Moden werden betrachtet, um zu untersuche, ob sie für die in situ Temperaturüberwachung verwendet werden können. Abschließend wurde eine ZnS Schicht auf einem nicht getemperten CTS Film abgeschieden, um eine gestapelte Mo/CTS/ZnS Schicht zu erhalten. Diese Schicht wird verwendet, um die Umwandlung von CTS/ZnS zu CZTS bei erhöhten Temperaturen zu untersuchen. Es wurde festgestellt, dass Raman Spektroskopie erfolgreich verwendet werden kann, um die Bildung von CZTS zu überwachen, indem die Haupt-Vibrations-Moden während des Temperns identifiziert werden. Die Intensität der CTS Moden verringert sich bei höheren Temperaturen. Bei 450 °C kann die CZTS Hauptmode bei 338 cm-1 klar identifiziert werden. Der zweite Teil konzentriert sich ebenfalls auf das Hochtemperatur-Tempern. In diesem Teil liegt der Fokus allerdings auf dem Tempern der Metal-Vorläufer-Schichten. Es wird erforscht, ob bestimmte Legierungen die Entstehung von Fremdphasen während der Entstehung der CZTS Absorberschichten begünstigen oder hemmen und welchen Einfluss dies auf die Leistung der Solarzelle hat. In situ XRD wird verwendet, um die Prozesse des Vortemperns zu überwachen. Kupfer arme Metall-Vorläufer-Schichten werden durch Sputtern aufgetragen. Die Vorläufer werden bei 150 °C, 200 °C, 300 °C und 450 °C in einem Drei-Zonen-Röhren-Ofen getempert. Die Auswirkungen auf die strukturellen Eigenschaften werden mit XRD analysiert, um den Entstehungsmechanismus der Legierungen zu untersuchen. Die Vorläuferschichten werden dann in einem Drei-Zonen-Röhren-Ofen sulfurisiert. Die strukturellen Eigenschaften des Absorbers werden analysiert und mit der Struktur der Vorläufer korreliert. Es wurde festgestellt, dass die Entstehung von SnS2 im Absorber proportional zum verbleibenden Sn im vorgetemperten Vorläufer ist. Außerdem zeigen Bilder des Rasterelektronenmikroskops, dass die Temperatur des Vortemperns das Kornwachstum und das Abschieden von Sn-S und Zn-S an der Oberfläche beeinflusst. Bei 450 °C vorgetemperte Absorber weisen keine dieser Phasen an der Oberfläche auf. Solarzellen werden aus diesen Absorber-Schichten hergestellt und die besten Zellen entstanden aus den bei 450 °C vorgetemperten Absorbern. Bei diesen traten Sn und SnS2 weder im Vorläufer noch im Absorber auf. Es konnte geschlussfolgert werden, dass SnS2 Phasen schädlich für den Wirkungsgrad der Zellen sind und dass die Intensität der SnS2 XRD Peaks invers proportional zum Wirkungsgrad der Zellen ist. Der dritte Teil erforscht die Reflektometrie als Methode zur Überwachung des Schichtwachstums während des thermischen Verdampfens in einer Anlage zur physikalischen Gasabscheidung (PVD). Ein Satz aus sechs CZTS Absorbern wird mittels ex situ Raman-Spektroskopie und Reflektometrie vermessen, um den Einfluss der Fremdphasen CuS und ZnS auf die Reflexionsspektren zu untersuchen. Die Zusammensetzung beeinflusst die Reflexionsspektren stark und CuS hinterlässt eine charakteristische Senkung bei 600 nm im Reflexionsspektrum. Eine Integrationsmethode wurde verwendet um dieses Phänomen quantitativ zu analysieren. Anschließend wurde ein Reflektometrieaufbau entworfen, entwickelt und in die PVD-Anlage integriert. Vier verschiedene CZTS koverdampfte und Mehrschicht-Filme wurden abgeschieden. Strukturelle, morphologische und Vibrationseigenschaften werden untersucht. Die Reflexionsspektren werden während des Abscheidens aufgenommen und zeitabhängige Reflexionsspektren werden auf charakteristische Aspekte im Zusammenhang mit Eigenschaften wie Dicke, Bandlücke und Entstehung von Phasen untersucht. CuS konnte in den Schichten mit der Integrations-Methode wegen der Überlagerung der CuS Senkung mit dem entstehenden Interferenzmuster nicht detektiert werden. Allerdings wurde in gestapelten CTS/ZnS Schichten beobachtet werden, dass der Beginn der ZnS Abscheidung durch eine ansteigende Intensität der Reflektion aufgrund der verringerten Oberflächenrauigkeit detektiert werden kann. Zusätzlich kann die Verschiebung des Startpunkts der Interferenzen zu niedrigeren Photonenenergien als charakteristischer Fingerabdruck während des Abscheidungsprozesses verwendet werden. Zusammenfassend zeigt diese Arbeit, dass Raman-Spektroskopie, XRD und Reflektrometrie erfolgreich als in situ Prozesskontrolle und –überwachung bei Hochtemperatur-Tempern und Vakuum-Abscheidung von Cu-Sn-Zn-S basierten Vorläufern und Absorbern realisiert werden konnten. Die Anwendung dieser in situ Techniken kann zu einer Optimierung der Eigenschaften von Dünnschicht-Materialien und von Solarzellen führen. Als solche hat diese Untersuchung den Weg für weitere Verbesserung von Cu-Sn-Zn-S basierte Vorläufer und Dünnschicht-Absorber geebnet.
How smart companies are opening up strategic initiatives to involve front-line employees, experts, suppliers, customers, entrepreneurs, and even competitors. Why are some of the world’s most successful companies able to stay ahead of disruption, adopting and implementing innovative strategies, while others struggle? It’s not because they hire a new CEO or expensive consultants but rather because these pioneering companies have adopted a new way of strategizing. Instead of keeping strategic deliberations within the C-Suite, they open up strategic initiatives to a diverse group of stakeholders—front-line employees, experts, suppliers, customers, entrepreneurs, and even competitors. Open Strategy presents a new philosophy, key tools, step-by-step advice, and fascinating case studies—from companies that range from Barclays to Adidas—to guide business leaders in this groundbreaking approach to strategy. The authors—business-strategy experts from both academia and management consulting—introduce tools for each of the three stages of strategy-making: idea generation, plan formulation, and implementation. These are digital tools (including strategy contests), which allow the widest participation; hybrid digital/in-person tools (including a “nightmare competitor challenge”); a workshop tool that gamifies the business model development process; and tools that help companies implement and sustain open strategy efforts. Open strategy has an astonishing track record: a survey of 200 business leaders shows that although open-strategy techniques were deployed for only 30 percent of their initiatives, those same initiatives generated 50 percent of their revenues and profits. This book offers a roadmap for this kind of success.
Take a fun and nostalgic look at the world of Volkswagen accessories. It is well documented that the Volkswagen Beetle is the best-selling vehicle of all time. In 1972, the 15-millionth Beetle was produced, breaking the record set by the Model T about 40 years earlier. It was a simple design with styling that appealed to the masses. It was affordable, practical, and fun. Because it was such a simple car and so many were sold, many people enjoy customizing their car with many accessories, which has been a large market for these cars dating back to the 1950s and 1960s. There is even a market today for people who collect these accessories without installing them. In Vintage Volkswagen Beetle Accessories, which is authored by veteran VW historian Stephan Szantai, a whole range of accessories are covered. Of course, a history of the Beetle is detailed, as well as the companies that formed the accessory aftermarket. Included are accessories for dressing up the exterior of the car, such as vented windows, bumpers and guards, turn-signal technology, add-on lighting, mirrors, etc. Then, interior accessories are examined, such as radios, ashtrays, gloveboxes, gauges, and clocks. No accessories book would be complete without engine accessories, covering both dress-up options and functional performance parts. Travel accessories, such as roof racks, coolers, extended gas tanks, tail racks, and coffee makers are detailed. Wheels are also covered. A gallery of accessorized Volkswagens of all types are featured, including Type 2 Buses; Type 3 squarebacks, fastbacks, and coupes; Karmen Ghias; and even single- and double-cab pickup bodystyles are included. Join the fun and nostalgic romp through VW accessory history with this new title that features everything cool about customizing your VW.
A vast swath of prairie situated between the Missouri River and the Rocky Mountains, the North American Great Plains extend across ten states in the United States and three provinces in Canada. The dominant vegetation is grass—both the native species that have long thrived here and the cultivated crops such as corn, wheat, and sorghum that are the result of human agricultural activity. This comprehensive guide, written by three grass specialists, is an invaluable tool for identification of the approximately 450 species of grasses that occur on the Great Plains. In each description, the authors cover distribution, habitat, forage value, and toxicity and include a detailed black-and-white illustration of the grass as well as a range map. Intended as a reference for landowners, rangeland specialists, students, state and federal agency professionals, and nongovernment conservation organizations, Grasses of the Great Plains will serve a wide audience of users involved in and dedicated to grassland management.
In the face of ever-declining biodiversity, zoos have a major role to play in species conservation. Written by professionals involved in in situ conservation and restoration projects internationally, this is a critical assessment of the contribution of zoos to species conservation through evidence amassed from a wide range of sources. The first part outlines the biodiversity context within which zoos should operate, introducing the origins and global spread of zoos and exploring animal collection composition. The second part focuses on the basic elements of keeping viable captive animal populations. It considers the consequences of captivity on animals, the genetics of captive populations and the performance of zoos in captive breeding. The final part examines ways in which zoos can make a significant difference to conservation now and in the future. Bridging the gap between pure science and applied conservation, this is an ideal resource for both conservation biologists and zoo professionals.
North American Wildland Plants is the sixth edition of North American Range Plants. This comprehensive reference contains the salient characteristics of the most important wildland plants of North America and will help individuals with limited botanical knowledge as well as natural resource professionals to identify wildland plants. The two hundred species of wildland plants in this book were selected because of their abundance, desirability, or poisonous properties. ø Each of the illustrations has been enhanced to maximize the use of this book as a field guide. Each plant description includes characteristics for identification, an illustration of the plant with enlarged parts, and a general distribution map for North America. Each species description includes nomenclature; life span; origin; season of growth; inflorescence, flower or spikelet, or other reproductive parts; vegetative parts; and growth characteristics. Brief notes are included on habitat; livestock losses; and historic, food, and medicinal uses.
Written for senior undergraduate and graduate students, as well as those chemists unfamiliar with “frustrated Lewis pairs (FLPs)”, this text serves as an introduction to the both the concept and application of FLPs in hydrogenation catalysis. The book begins by setting the stage as it was around the turn of the century. While the dramatic impacts of catalysis were undeniable, there was dependence of such technologies on transition metal chemistry. Contrastingly, the chemistry of main group elements was dominated by Lewis acid-base behavior. However, these perceptions were altered with the discovery of the ability of “frustrated Lewis pairs (FLPs)” to activate dihydrogen. The basic features, and mechanisms of action of these unique main group systems are chronicled, while the evolution of the initial findings to applications in catalytic hydrogenation is discussed. A subsequent chapter focuses on the breadth of organic substrates for which borane based FLP hydrogenations are effective. This is furthered with a chapter on the metal-free enantioselective reductions. FLP chemistry is not limited to systems involving boranes and this book also catalogues a range of FLP hydrogenation catalysts involving elements from across the periodic table. The final chapter in the book describes other directions of interest where the application of the concept of FLPs hydrogenation are beginning to emerge. Ideal for course use and self study, this book provides synthetic chemists with a fresh, expert introduction to the field. The reader will be left recognizing that hydrogenation catalysts is a domain no longer limited to transition metals.
Marketing communication is a dynamic industry, which continues to change and adapt to new technologies, media consumption patterns and communication interfaces between marketers and their target markets. At the same time, the fundamental communication processes and well-established theories and models are very much applicable in this dynamic environment. This revised second edition blends the well-established with the new and emerging aspects of marketing communications. Marketing Communications applies a uniquely practical approach to the topic, providing a structured overview of planning, development, implementation and evaluation of marketing communications, alongside detailed case studies that demonstrate how the theory translates to practice. Fully updated, the new edition considers important developments in the global marketplace. It includes new content on emerging digital media platforms, changing media consumption patterns and consumers’ strategies to cope with information overload. It also reflects upon consumer scepticism, a growing phenomenon that communication specialists need to overcome when designing and implementing effective campaigns. This new edition also considers the importance of marketing communications tools in not-for-profit sectors, such as social marketing and political marketing, as well as the cross-cultural aspect of marketing communications. This textbook is essential reading for both students and professionals in marketing, communications and public relations. Online resources include an extensive instructors’ guide, which provides answer checklists to all Think boxes, Ethical issues and end-of-chapter cases within the book. The text is also supported by PowerPoint slides and test banks for all chapters and major cases.
This will help us customize your experience to showcase the most relevant content to your age group
Please select from below
Login
Not registered?
Sign up
Already registered?
Success – Your message will goes here
We'd love to hear from you!
Thank you for visiting our website. Would you like to provide feedback on how we could improve your experience?
This site does not use any third party cookies with one exception — it uses cookies from Google to deliver its services and to analyze traffic.Learn More.