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  • av Vincenzo Vignieri
    1 290,-

    Over the last two decades, the field of public administration has witnessed theoretical and practical changes that have innovated the relationships between public administration and performance management.Dealing with the rising complexity of performance regimes in contemporary public administration requires that policy-makers and their organizations are able to face unpredictable problems impacting on a community's quality of life. Complex policy issues - such as immigration, pandemics, societal aging, crime, unemployment, and financial crises  - cannot be easily solved by quick fixes that are focused only on a short-term and bounded vision of their causes. They rather require "e;robust"e; methods to support policy analysis and to affect sustainable community outcomes in cross-boundary settings.As illustrated in this book, Dynamic Performance Management provides a methodological framework enabling policy-makers to outline the causal relationships among policy outcomes, performance drivers, and related strategic resources. Such a modeling approach helps stakeholders to broaden the investigated system boundaries so to balance short- and long-term performance under different result domains.This approach blends performance management and System Dynamics modeling. Several examples and case studies are discussed to enable scholars and practitioners to appreciate the practical implications related to the use of such an approach.

  • Spar 18%
    av Cengiz Kahraman
    2 318,-

    This book states that intelligent digital transformation is the process of using artificial intelligence techniques in digital technologies such as machine learning, natural language processing, automation and robotics to transform existing non-digital business processes and services to meet with the evolving market and customer expectations. This book including 26 chapters, each written by their experts, focuses on revealing the reflection of digital transformation in our business and social life under emerging conditions through intelligent systems. Intelligent digital transformation examples from almost all sectors including health, education, manufacturing, tourism, insurance, smart cities, banking, energy and transportation are introduced by theory and applications. The intended readers are managers responsible for digital transformation, intelligent systems researchers, lecturers, and MSc and PhD students studying digital transformation.

  • av Galimkair Mutanov
    1 290,-

    This book includes 15 works by scientists of the Eurasian region, which reveal the various stages of the life cycle of digital transformation The creation of value propositions and their distribution chains is important for the sustainable development of society.This view of sustainable value chains on the part of public administration and business, considering modern scientific research, reveals the problems of education and science in the formation of chains sustainability and their infrastructure.Modern views on the actual problems of the digital service in the creation of value propositions with the participation of development institutions, new educational technologies, and state regulation both at the level of the world community and at the level of individual countries are revealed.The problems of digital transformation of economic actors and industries at different stages of the chain of value creation from a position of sustainable development, innovation in the infrastructure of public administration markets are considered.This book is useful to the academic community and a new generation of infrastructure creators to identify vectors to support the innovative development of value chains.

  • - Proceedings of the 5th International Conference on Neurorehabilitation (ICNR2020), October 13-16, 2020
    av Diego Torricelli
    4 943,-

    The book reports on advanced topics in the areas of neurorehabilitation research and practice. It focuses on new methods for interfacing the human nervous system with electronic and mechatronic systems to restore or compensate impaired neural functions. Importantly, the book merges different perspectives, such as the clinical, neurophysiological, and bioengineering ones, to promote, feed and encourage collaborations between clinicians, neuroscientists and engineers.  Based on the 2020 International Conference on Neurorehabilitation (ICNR 2020) held online on October 13-16, 2020, this book covers various aspects of neurorehabilitation research and practice, including new insights into biomechanics, brain physiology, neuroplasticity, and brain damages and diseases, as well as innovative methods and technologies for studying and/or recovering brain function, from data mining to interface technologies and neuroprosthetics. In this way, it offers a concise, yet comprehensive reference guide to neurosurgeons, rehabilitation physicians, neurologists, and bioengineers. Moreover, by highlighting current challenges in understanding brain diseases as well as in the available technologies and their implementation, the book is also expected to foster new collaborations between the different groups, thus stimulating new ideas and research directions.

  • Spar 16%
    av Enrique Coraza de los Santos
    1 068,-

    This book critically examines the association between the notions of crisis and migration in the context of Latin America, and from three different perspectives: first, it analyzes the discourses based on the concept of crisis employed by the media, academic researchers, civil society organizations and the state to frame human mobility issues; second, it investigates migrants' agency under conditions of crisis; and third, it discusses whether "e;migration crisis"e; is a conjunctural or structural phenomenon in the region.Chapters in this contributed volume investigate the crisis-migration nexus in seven Latin American countries - Argentina, Brazil, Colombia, Costa Rica, Mexico, Nicaragua and Uruguay - by discussing different human mobility phenomena, such as the migrant caravans that departed from Central America bound to Mexico and the United States; the Nicaraguan exodus caused by the political crisis in the country; the perception of Venezuelan migrants in Colombia's media; the presence of Caribbean migrants in Brazil, Uruguay and Argentina.Crisis and Migration: Critical Perspectives from Latin America will be of interest to a wide range of social scientists interested in migration studies, as well as to policy makers and civil society organizations. This book offers a fresh look at the way we conceive, represent, and think about the relationship between crisis and human mobility. As the volume's contributions show, a critical examination of the notion of crisis is a first step towards a more comprehensive understanding of the plight of present-day migrants worldwide.

  • av Madeleine J. H. van Oppen
    1 933,-

    The rapid demise of coral reefs worldwide has spurred efforts to develop innovative conservation and restoration methods. Many of these rely on omics approaches to produce genetic, genomic, transcriptomic, epigenomic or metabolomic data to inform conservation and restoration interventions. This book provides the state of play of this field. It discusses topics ranging from how genomic and environmental DNA (eDNA) data can be used to inform marine protected area design and cryopreservation strategies, the use of knowledge on adaptive genetic and epigenetic variation to maximise environmental stress tolerance of coral stock, harnessing transcriptome data to develop early warning markers, the use of microbial symbiont omics data in guiding restoration strategies, to applications of metabolomics and genetic engineering. How best to translate omics data to resource managers is also discussed.

  • av Constantin Jung
    525,-

    This book addresses the legal protection insurance market and continues the collection and analysis of data carried out by Legal Protection International aisbl (at the time, the International Association of Legal Protection Insurance) in recent years. Its first part covers the fundamentals of and recent advances in the legal protection insurance market, while the second presents a study on the relevant legal framework for offering Legal Technology services as a legal protection insurer in Germany. In this context, the study also defines the term "e;Legal Technology"e;, categorises Legal Technology services ("e;application-oriented categorisation"e;), analyses the relevant European legal framework and highlights the connections to the upcoming European Artificial Intelligence Act.

  • av Ibrahim Rotimi Aliu
    659,-

    This book explores the drivers and impacts of sand mining in the coastal areas of Lagos Nigeria. Based on empirical evidence, sand mining activity is driven by a number of urbanization-related factors while sand mining impacts are underlined by a number of sustainability-related factors. Four urbanization components describe the drivers of sand mining and four sustainability components describe the impacts of sand mining in Lagos. This book concludes on the puzzling dilemma of sand mining that supports thriving urbanization but undermines environmental sustainability in Lagos. Of course, sand mining has strong implications for environmental sustainability in Lagos coastal areas. This book is of immense benefit to environmental planners, city administrators, students of environmental science and the general public who have regards for environmental management. 

  • Spar 15%
    av Haomiao Yang
    542,-

    This book proposes secure schemes to address security challenges in secure automatic dependent surveillance-broadcast systems (ADS-B) from five different angles. First, the authors examine encryption schemes applied to the ADS-B environment for protecting messages confidentiality. Second, they propose an ADS-B broadcast authentication scheme with batch verification by employing an identity-based signature. Third, they present ADS-B broadcast authentication scheme based on a digital signature with message recovery, which provides a feature that the message is recoverable from the signature. Fourth, they propose a new cryptographic solution to ADS-B security. Finally, they propose an accurate and efficient cognitive aircraft location verification scheme preserving aircraft location privacy by utilizing a grid-based k-nearest neighbor algorithm. In summary, the authors show how ADS-B data links can greatly enhance flight safety by these proposed schemes without sacrificing data security.Proposes several secure schemes to address security challenges in secure automatic dependent surveillance-broadcast systems (ADS-B);Provides extensive experiments and evaluates the proposed schemes using real-world data;Shows how ADS-B data links can greatly enhance safety without sacrificing data security

  • Spar 15%
    av Coral Calero
    1 485,-

    This book focuses on software sustainability, regarded in terms of how software is or can be developed while taking into consideration environmental, social, and economic dimensions. The sixteen chapters cover various related issues ranging from technical aspects like energy-efficient programming techniques, formal proposals related to energy efficiency measurement, patterns to build energy-efficient software, the role of developers on energy efficient software systems and tools for detecting and refactoring code smells/energy bugs; to human aspects like its impact on software sustainability or the adaptation of ACM/IEEE guidelines for student and professional education and; and an economics-driven architectural evaluation for sustainability. Also aspects as the elements of governance and management that organizations should consider when implementing, assessing and improving Green IT or the relationship between software sustainability and the Corporate Social Responsibility of software companies are included. The chapters are complemented by usage scenarios and experience reports on several domains as cloud applications, agile development or e-Health, among others. As a whole, the chapters provide a complete overview of the various issues related to sustainable software development.The target readership for this book includes CxOs, (e.g. Chief Information Officers, Chief Executive Officers, Chief Technology Officers, etc.) software developers, software managers, auditors, business owners, and quality professionals. It is also intended for students of software engineering and information systems, and software researchers who want to know the state of the art regarding software sustainability.

  • av Carl S. Young
    2 029,-

    This book tackles the problem of complexity within IT environments, i.e., "e;Cybercomplexity,"e; which is generally recognized as a principal source of cybersecurity risk. The book first defines complexity and simplifies its analysis by assuming a probabilistic approach to security risk management. It then proposes a simple model of cybercomplexity that is based on Shannon entropy, a basic concept in information theory. The key drivers of cybercomplexity emerge from this model, where these drivers reveal the scale-dependence of cybersecurity risk and explain why macroscopic security controls are required to address cybersecurity risk on an enterprise scale. The significant operational implications of cybercomplexity are also discussed, thereby providing both a theoretical framework and a practical guide to addressing this longstanding problem in cybersecurity risk management.        

  • av Ross Bond
    641,-

    Uniquely informed by a sociological perspective, this major new textbook introduces the underlying origins and consequences of international migration, placing individuals within a broader social, cultural and historical context. This comprehensive introduction analyses international migration and its effects on those who migrate, their families, and their places of origin and destination. Drawing on illustrative examples from around the world, the book covers the major theories concerning the origins of international migration and the manner, degree and consequences of migrants' incorporation into the societies to which they move. It also includes in-depth discussion of how international migration is relevant to key issues - gender, the family, and religion; the so-called refugee 'crisis' in much of the developed world; and offers insights throughout into cutting-edge research from emotions and lifestyle migration to the proliferation of digital communication technologies. This text expertly offers students the necessary skills to unpack common myths that are used to inform policy and media discourse, including abstract distinctions between 'refugee' and 'economic migrant', the complex and ambiguous nature of migrant national identity, and that while many richer countries of the world are characterized by a perceived refugee 'crisis', it is in fact poorer and developing countries that see the vast majority of the world's refugees and displaced persons.

  • av Miroslav Horák
    1 290,-

    This book presents an in-depth qualitative study carried out with inpatients under treatment for substance use disorders (SUDs) in seven therapeutic communities (TCs) located in three countries: Peru, Nicaragua and Czech Republic. By comparing the experiences in these different cultural contexts, the book presents a grounded theory of SUDs treatment in TCs from a cross-cultural perspective, identifying factors that influence the efficacy of SUDs treatment in TCs based on interviews carried out with inpatients.Based on rigorous qualitative research methods, this book presents not only a comparative analysis of TCs located in different cultural contexts, but also analyzes the cross-cultural nature of the therapeutic programs adopted in these communities, such as the combination of traditional Amazonian medicine based on the therapeutic use of ayahuasca with conventional psychotherapy and occupational therapy, among other approaches. Departing from the interviews carried out with inpatients, the authors present a comparative analysis of how the different TCs address important issues related to SUDs treatment, and complement this analysis with machine-generated summaries of relevant scientific papers. These summaries contain results of similar research projects conducted in other cultural contexts. Substance Use Disorders Treatment in Therapeutic Communities: A Cross-Cultural Approach presents the results of a unique comparative study with great translational potential which will be of interest to both researchers and practitioners working in TCs. This unique comparative study identifies factors affecting the efficacy of therapeutic programs and proposes a grounded theory which aims to serve as an important source of information for therapists and other professionals working with SUDs treatment and for the replication of applied therapeutic methods in other TCs.

  • Spar 13%
    av George A. Anastassiou
    1 603,-

    This book is about the generalization and modernization of approximation by neural network operators. Functions under approximation and the neural networks are Banach space valued. These are induced by a great variety of activation functions deriving from the arctangent, algebraic, Gudermannian, and generalized symmetric sigmoid functions. Ordinary, fractional, fuzzy, and stochastic approximations are exhibited at the univariate, fractional, and multivariate levels. Iterated-sequential approximations are also covered. The book's results are expected to find applications in the many areas of applied mathematics, computer science and engineering, especially in artificial intelligence and machine learning. Other possible applications can be in applied sciences like statistics, economics, etc. Therefore, this book is suitable for researchers, graduate students, practitioners, and seminars of the above disciplines, also to be in all science and engineering libraries.

  • Spar 18%
    av Mykhailo Ilchenko
    2 318,-

    This book highlights the most important research areas in information and communication technologies, namely the research in fields of modern information technologies that deal with various aspects of the analysis and solution of practically important issues of information systems in general, and contains discussion about the progression from big data to smart data, development of cloud-based architecture, practical implementation of Internet of Things (IoT), the fundamentals of information and analytical activities; studying of modern communication technologies contains original works dealing with many aspects of construction, using research and forecasting of technological and services characteristics of communication systems, as well as research of modern radio electronics technologies that contains actual papers, which show some effective technological solutions that can be used for the implementation of novel radio electronics systems. These results can be used in the implementation of novel systems and to promote information exchange in e-societies. This book offers a valuable resource for scientists, lecturers, specialists working at enterprises, and graduate and undergraduate students who engage with problems in information and communication technologies.

  • Spar 10%
    av Ross G. Menzies
    1 903,-

    Clients enter therapy grappling with a range of difficulties. They don't speak in diagnostic terms, but instead focus on the everyday problems that confront them. Their struggles may include isolation, loneliness, anxiety, guilt and regret, and problems making decisions in a world that offers seemingly endless choice. In contrast, the cognitive-behavior therapist is trained in the language of conditioning and extinction, avoidance and safety behaviors, behavioral activation and attentional biases. This book explores the ideas of the existentialist philosophers as a bridge between the suffering client and technically trained clinician. The volume is not a rejection of cognitive behavior therapy (CBT), but seeks to place CBT in the broader context of the most popular philosophic tradition of the 19th and 20th centuries. Therapists versed in existentialism argue that the individual's starting point is characterized by a sense of disorientation in the face of an apparently meaningless and absurd world. Each individual must become solely responsible for giving meaning to life and living it passionately and authentically. Each of us must confront the 'Big 5' existential issues of death, isolation, identity, freedom and meaning and find our solutions to these problems. The present volume explores each of these existential themes in turn. Each section opens with a theoretical chapter describing the relevant existential dilemma and its impact on human experience. The second chapter in each section explores its relationship to mental health disorders and psychopathology. The third chapter in each section explores the evidence for treating the existential issue from a CBT framework. This book will be of value to those interested in CBT, philosophy and mental health, and will appeal to psychotherapists, clinical psychologists and psychiatrists.

  • Spar 16%
    av Nabeel Khan Niazi
    2 145,-

    This book provides a plethora of information about global arsenic (As) contamination and the challenges for environment. Arsenic is a naturally occurring metalloid that is widely distributed in water, soil, air and biota from natural and anthropogenic sources. Arsenic has been found in drinking water in over 100 countries worldwide, which caused a major public health issue including: cardiovascular disorders, diabetes, and cancers of various organs - these are some of the general health effects of As exposure. Exposure of plants to As, even at very low concentrations, can cause many morphological, physiological, and biochemical changes. The recent research on As in the water-soil-plant-human systems indicates that As toxicity to plants varies with As speciation in plants, type of plant species and with other soil factors controlling As accumulation in plants. In recent years, the development of efficient green chemistry methods for detoxification of trace metal poisoning has become a major focus of researchers. It has been investigated in order to find an eco-friendly and recyclable technique for the removal of As contamination from the natural resources.Understanding the significance of As hazard and roles of sustainable or eco-friendly approaches in its mitigation, we intend to bring forth a comprehensive volume "e;Global Arsenic Hazard - Ecotoxicology and Remediation"e; highlighting the various prospects involved in current scenario. We are hopeful that this comprehensive volume will furnish the requisite of all those who are working or have interest in the proposed topic.

  • av Erika Ábrahám
    647,-

    This book constitutes the proceedings of the 19th International Conference on Quantitative Evaluation Systems, QEST 2022, held in Warsaw, Poland, in September 2022.The 19 full papers presented together with 1 keynote paper were carefully reviewed and selected from 44 submissions. The papers are organized in the following topics: program analysis; parameter synthesis; markovian agents and population models; dynamical systems; tools; applications and automata theory; and applications.

  • Spar 18%
    av Marcel van Oijen
    583,-

    The book shows how risk, defined as the statistical expectation of loss, can be formally decomposed as the product of two terms: hazard probability and system vulnerability. This requires a specific definition of vulnerability that replaces the many fuzzy definitions abounding in the literature. The approach is expanded to more complex risk analysis with three components rather than two, and with various definitions of hazard. Equations are derived to quantify the uncertainty of each risk component and show how the approach relates to Bayesian decision theory. Intended for statisticians, environmental scientists and risk analysts interested in the theory and application of risk analysis, this book provides precise definitions, new theory, and many examples with full computer code. The approach is based on straightforward use of probability theory which brings rigour and clarity. Only a moderate knowledge and understanding of probability theory is expected from the reader.

  • av Peter Wollmann
    630,-

    The book addresses an explicit demand expressed in a large number of C-Suite interviews: managing significant transformations in the private and public sector. The book describes what types of transformation have to be reflected, why transformations are crucial in our days, the triggers they have, and how they might be best managed from a theoretical and practical point of view - technically and with all people-connected soft facts. The book, which contains numerous use cases, is written by an international community of practitioners, experts, and academics from different geographies, countries, public and private organizations, industries, and cultures, which guarantees the comprehensiveness and richness of the developed insights and the value of the presented use cases.

  • av Isabel Hilliger
    1 089,-

    This book constitutes the proceedings of the 17th European Conference on Technology Enhanced Learning, EC-TEL 2022, held in Toulouse, France, in September 2022.The 30 research papers and 31 demo and poster papers presented in this volume were carefully reviewed and selected from 109 submissions. Chapter "e;Learners' Strategies in Interactive Sorting Tasks"e; is available open access under a CC BY 4.0 license.

  • av Jorge Vargas Florez
    2 575,-

    This proceedings volume convenes selected, peer-reviewed contributions presented at the POMS 2021 - International Conference on Production and Operations Management, which was virtually held in Lima, Peru, December 2-4, 2021. This book presents results in the field of Operations Management of key relevance to practitioners, instructors, and students. Topics focus on Operations Management, Logistics and Supply Chain Management, and Industrial and Production Engineering and Management, where mathematics and its applications play a role. In this work, readers will find a colorful collection of real-world case studies, accompanied by operations research-based managerial models. They touch on myriad topics, ranging from Artificial Intelligence and Data Analytics in Operations, Defense, Tourism, and other emerging issues in Operations Management to Healthcare Operations Management and Humanitarian Operations and Crisis Management.The POMS Lima 2021 International Conference has been organized by the Latin America & Caribbean Chapter of the Production and Operations Management Society, the most renowned professional and academic organization representing the interests of production and operations management professionals and academicians around the world. Since 2018, POMS International Conferences have been organized by POMS-LA, the first venue being in Rio de Janeiro, Brazil. Venue 2021 event was hosted by the Pontifical Catholic University of Peru and Pacific University, two Peruvian Latin-American leading academic institutions from Peru.

  • av Maurizio Valle
    1 290,-

    This book reports on cutting-edge research and developments focusing on  integrating intelligent functionalities into materials, components, systems and products. Gathering the proceedings of the 6th International Conference on System-Integrated Intelligence (SysInt 2022), held on September 7-9, in Genova, Italy, it offers a comprehensive, multidisciplinary and applied perspective on the state-of-the art and challenges in the field of intelligent, flexible and connected systems. The book covers advanced methods and applications relating to artificial, pervasive and ubiquitous intelligence, sensors, smart factory and logistics, structural health monitoring, as well as soft robotics, cognitive systems and human-machine interaction. Giving a special focus to artificial intelligence, it  extensively reports on methods and algorithms for data-driven modeling, and agent-based data processing and planning. It aims at inspiring and fostering collaboration between researchers and professionals from the different fields of  electrical, manufacturing and production engineering, and materials and computer sciences. 

  • av Alane Beatriz Vermelho
    3 643,-

    This book reviews new promising drug targets for Neglected Tropical Diseases (NTDs), with a special focus on antiprotozoal drugs against trpyanosomatids Trypanosoma cruzi and Leishmania spp. The book offers a comprehensive overview of the most recent studied targets, and it outlines classical and new treatments and delivery strategies. Expert contributors describe new methods of analysis and bio-prospecting for new compounds, and provide a critical perspective of the translational process used in the research and development of new drug candidates.The book will appeal not only to researchers, students and professionals interested in drug development to protozoan diseases, but also to medicinal chemists in general.

  • av Pablo Fossa
    654,-

    Inner speech has been a focus of multidisciplinary interest. It is a long-standing phenomenon of study in philosophy, psychology, and anthropology. Researchers from different disciplines have turned their efforts to understand this inherent experience of being "e;talking to oneself"e;. In psychology, Vygotsky managed to develop a complete description of the phenomenon, giving rise to a great line of research related to inner speech in the human experience. Including a compilation of theoretical and empirical advances related to inner speech phenomenon, this book is aimed at academics and researchers in the area of psychology, education and culture. This book will be of interest to international research programs, related to cultural psychology, socio-constructivism, developmental psychology and education.

  • av Issa Traore
    2 061,-

    This book presents advances in security assurance for cyber-physical systems (CPS) and report on new machine learning (ML) and artificial intelligence (AI) approaches and technologies developed by the research community and the industry to address the challenges faced by this emerging field.Cyber-physical systems bridge the divide between cyber and physical-mechanical systems by combining seamlessly software systems, sensors, and actuators connected over computer networks. Through these sensors, data about the physical world can be captured and used for smart autonomous decision-making.This book introduces fundamental AI/ML principles and concepts applied in developing secure and trustworthy CPS, disseminates recent research and development efforts in this fascinating area, and presents relevant case studies, examples, and datasets. We believe that it is a valuable reference for students, instructors, researchers, industry practitioners, and related government agencies staff.

  • Spar 16%
    av Gabriel Zachmann
    533,-

    This book constitutes the refereed proceedings of the 19th International Conference on Virtual Reality and Mixed Reality, EuroXR 2022, held in Stuttgart, Germany, in September 2022.The 6 full and 2 short papers were carefully reviewed and selected from 37 submissions. The conference presents contributions on results and insights in Virtual Reality (VR), Augmented Reality (AR), andMixed Reality (MR), commonly referred to under the umbrella of Extended Reality (XR), including software systems, immersive rendering technologies, 3D user interfaces, and applications.

  • av Clarice Dias de Albuquerque
    647,-

    This book offers a structured algebraic and geometric approach to the classification and construction of quantum codes for topological quantum computation. It combines key concepts in linear algebra, algebraic topology, hyperbolic geometry, group theory, quantum mechanics, and classical and quantum coding theory to help readers understand and develop quantum codes for topological quantum computation.One possible approach to building a quantum computer is based on surface codes, operated as stabilizer codes. The surface codes evolved from Kitaev's toric codes, as a means to developing models for topological order by using qubits distributed on the surface of a toroid. A significant advantage of surface codes is their relative tolerance to local errors. A second approach is based on color codes, which are topological stabilizer codes defined on a tessellation with geometrically local stabilizer generators. This book provides basic geometric concepts, like surface geometry, hyperbolic geometry and tessellation, as well as basic algebraic concepts, like stabilizer formalism, for the construction of the most promising classes of quantum error-correcting codes such as surfaces codes and color codes.The book is intended for senior undergraduate and graduate students in Electrical Engineering and Mathematics with an understanding of the basic concepts of linear algebra and quantum mechanics.

  • Spar 13%
    av Madiha Neelam
    494,-

    This book examines representations of Muslim women as speakers of English in the context of a language ideological debate in the UK in 2016. The author shows how Muslim women are stereotyped as non-speakers of English through the manipulation of census data, and how this supposed lack of English is discursively constructed as an index of their supposed oppression, complicity in the threat of extremism emanating from their sons, and limited participation in the labour force. The book aims to complement a growing body of research on raciolinguistics and language ideologies. It illuminates the intersection of language, Islamophobia, and securitization, and will be of interest to postgraduate students and academics working in applied linguistics and discourse analysis, and interdisciplinary audiences in studies of race, Islamophobia, and gender. 

  • av Friedrich Wilhelm Proes
    647,-

    In this dissertation a new process chain for the Additive Manufacturing of Mechatronic Integrated Devices (AMMID) is described, which provides a new way to manufacture 3-dimensional electronic devices based on the selective laser sintering (SLS) process using laser direct structuring (LDS) and metallization. The AMMID process chain meets the rising demand for highly functionalized parts, increasing individualization and shortening development cycles for electronic products.The development for this process chain is based on an extensive literature review that indicates that an SLS-based process chain has great potential to produce 3-dimensional electronic devices with properties and with the future perspective of being suitable for an individualized mass production. The biggest, initial, technical hurdle is an unstable SLS process using a conventional LDS additive. The compound of SLS material and LDS additive was analyzed with DSC, which shows that the additive changes the melting behavior of the polymer by reducing the sintering window. A fine metal powder as an alternative additive affects the sintering window less and enables a stable process. To choose a suitable particle size and content for the metal powder an analytical material model is provided, that predicts the additive particle distribution within the material. This material model deepens the understanding of the activation mechanism during laser activation, provides hands-on information for powder preparation and it is applied for the design of the experiment for the development of the process chain with the new material.Preliminary experiments are conducted along with the insights of the material model, which prove that redeposition is the main activation mechanism during laser activation with fine metal powders. Based on this, the process chain is developed, starting with a determination of a suitable additive content. A suitable material composition of a PA12 powder containing 2 wt.% of a copper powder with a mean particle diameter of 3.5 ?m was identified. With regard to the laser activation, working laser parameters are developed (working parameter set feasible for all used post-process treatments: PRF = 1 kHz, dh = 25 ?m, vs = 25 mm/s, tl = 20ns and P = 1.07 W). In this parameter development it is shown, that only closely located laser spots, enabling interaction of the laser pulses, are capable of activating the surface, while single laser pulses under applied conditions are not. By adding a post-process treatment as additional process step into the process chain, the quality of metallization and the size of design features could be improved. Chemical smoothing resulted in a complete reduction of unwanted metallization on non-activated surfaces. Conductor tracks with the minimal width of 300 ?m could be realized. The process chain could be applied to demonstrator parts such as a drone housing and a PSU panel of an aircraft. Thus, this dissertation has raised the technology readiness level (TRL) from TRL2 to TRL6.Finally, an economic consideration provides insights on the cost structure of parts produced with the AMMID process. A comparison of AMMID and injection molding shows economic viability for small lot sizes, 400 parts in case of the drone housing and 150 parts in case of the PSU panel. Finally, the analysis of the cost structure gives advice which future developments in the process chain have the greatest effect on costs and provides prioritization.

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