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Introduces timed arrays and design approaches to meet the new high performance standards The author concentrates on any aspect of an antenna array that must be viewed from a time perspective. The first chapters briefly introduce antenna arrays and explain the difference between phased and timed arrays. Since timed arrays are designed for realistic time-varying signals and scenarios, the book also reviews wideband signals, baseband and passband RF signals, polarization and signal bandwidth. Other topics covered include time domain, mutual coupling, wideband elements, and dispersion. The author also presents a number of analog and digital beamforming networks for creating and manipulating beams. The book concludes with an overview of the methods to integrate time delay into the array design and of several other adaptive arrays that prove useful in many different systems. Examines RF signal concepts such as polarization and signal bandwidth and their applications to timed antenna arrays Covers arrays of point source, elements in timed antenna arrays, active electronically scanned array technology, and time delay in corporate fed arrays Includes complete design examples for placing time delay in arrays Timed Arrays: Wideband and Time Varying Antenna Arrays is written for practicing engineers and scientists in wireless communication, radar, and remote sensing as well as graduate students and professors interested in advanced antenna topics.
Menschen und ihre Materialien. Von der Steinzeit bis heute
Was verandert die Welt? Wer hat denn nun die Welt am starksten verandert: die Politiker, die Ideen in die Tat umsetzten, oder die Philosophen, von denen sie stammten? Oder vielleicht sogar jemand ganz anderes? Etwa der Erfinder des Papiers, ohne das weder Buchdruck noch Reformation denkbar waren? Oder auch diejenigen, die Eisen und Bronze hervorbrachten und damit ganze Epochen begrundeten. Dieses Buch belegt eindrucksvoll: Unsere Geschichte ist immer auch die der Materialien, die wir verwenden. Geschichte neu geordnet Systematisch geht der Autor der Frage nach, wie die Entwicklung von Kulturen und die Moglichkeiten der Materialherstellung zusammenhangen. Er durchstreift die Jahrtausende und setzt dabei bestimmte Zeiten und Materialgruppen zueinander in Beziehung. Dabei beleuchtet er nicht zuletzt spannende Details von Herstellung und Verarbeitung. Alternative Realitaten Und auch Gedankenspielen gibt das Buch Raum, denn die Frage >Was ware wenn?< beendet jedes seiner Kapitel. Unterhaltsam und lehrreich sind diese Spekulationen uber einen moglichen Gang der Dinge fur den Fall, dass es bestimmte Materialinnovationen nicht gegeben hatte. In diesen Passagen wird besonders deutlich, wie gro? die Bedeutung des >materiellen< Aspekts von Geschichte ist – ohne den im Ubrigen auch solche Errungenschaften wie Kunst und moderne Medizin undenkbar waren.
Projekt-PR. Vom Kulturprojekt bis zum Großflughafen
Es gibt viele Projekte, die nicht nur fur schlechtes Projektmanagement bekannt sind, sondern auch fur mangelhafte Information und Kommunikation – prominentestes Beispiel ist wohl der Flughafen Berlin Brandenburg. Tatsachlich ist aktive und reaktive Projekt-PR ein wichtiger Erfolgsfaktor im Projektmanagement, vollig unabhangig von der Gro?e des Projekts. Verantwortlich dafur ist der Projektmanager, gemeinsam mit allen, die Verantwortung fur die Planung, Finanzierung und Ausfuhrung eines Projekts tragen. Nur mittels regelma?iger effektiver und effizienter Information und Kommunikation konnen sie mehr Offenheit im Projektumfeld erreichen und das Vertrauen der Offentlichkeit und der Projektbeteiligten gewinnen. Damit das funktioniert, sind alle Beziehungen im Zusammenhang mit dem Projekt – zum Auftraggeber, den Stakeholdern, Mitarbeitern, Lieferanten, Partnern und selbstverstandlich zur Offentlichkeit – immer wieder umfassend zu analysieren, fortwahrend zu verbessern und bei Bedarf neu zu gestalten. Das Buch beschreibt das ganzheitliche Beziehungsmanagement im Rahmen von Projekten und erlautert, warum Projektmanager ihr Projekt auch vermarkten und verkaufen mussen und wie sie damit einen wesentlichen Beitrag fur das Image des Projekts und ihres Unternehmens oder ihrer Organisation leisten. Der Autor beginnt bei der Konzeption der PR-Arbeit, zeigt die Bedeutung der PR in Bezug auf den Kunden, beschreibt die betreffenden Verantwortlichkeiten im Projekt sowie die klassische Medienarbeit in Presse, Rundfunk und Fernsehen und schlie?t mit Content-Strategien, dem Einsatz von Social Media im Rahmen der Projekt-PR sowie praktischen Checklisten..
Computational Color Science. Variational Retinex-like Methods
Color is a sensation generated both by the interaction of the visual sensors in the eyes with the natural environment and by the elaboration of visual information by higher brain functions. This book presents the mathematical framework needed to deal with several models of color processing of digital images. The book starts with a short yet exhaustive introduction to the basic phenomenological features of color vision, which are constantly used throughout the book. The discussion of computational issues starts with color constancy, which is dealt with in a rigorous and self-contained mathematical setting. Then, the original Retinex model and its numerous variants are introduced and analyzed with direct discrete equations. The remainder of the book is dedicated to the variational analysis of Retinex-like models, contextualizing their action with respect to contrast enhancement.
Geodiversity. Valuing and Conserving Abiotic Nature
The first book to focus exclusively on the subject, Geodiversity, Second Edition describes the interrelationships between geodiversity and biodiversity, the value of geodiversity to society, as well as current threats to its existence. Illustrated with global case studies throughout, the book examines traditional approaches to protecting geodiversity and the new management agenda now being implemented. The Second Edition of this successful textbook continues to build on the success of the first edition which is still the standard reference for the subject. Fully revised and updated throughout, the Second Edition now includes new material on geoparks, geotourism and implications of climate change for geoconservation. Reviews of previous edition: “Murray Gray’s new book is the first widely available text to bring together and analyse some of these emerging ideas….The result is a book that should be in the library of every land manager and one that is likely to lead many practicing geoscientists and quaternarists to a new view of the importance of their field for nature conservation and environmental management… (Journal of Quaternary Science, Vol.19, No.8, December 2004) “It is strange that it is necessary to justify the importance of geodiversity…. Murray Gray does it with brilliance, not only to convince ‘non-believers’, but giving inspiration to us that have worked in geoconservation for a long time” (ProGEO News, 3 & 4, 2003) «…The author provides a timely review of recent advances in the integration of geodiversity into wider conservation and planning strategies…» ….” (Journal of Quaternary Science, Vol.19, No.8, December 2004) «…the book is well-written and follows a clear and concise outline.» (Environmental Geology, Vol. 48, No. 2, July 2005)
E-mail and Behavioral Changes. Uses and Misuses of Electronic Communications
This book is a study of the causes of spam, the behaviors associated to the generation of and the exposure to spam, as well as the protection strategies. The new behaviors associated to electronic communications are identified and commented. Have you ever felt overwhelmed by the number of e-mail and textual messages in your inbox, be it on your laptop, your Smartphone or your PC? This book should help you in finding a wealth of answers, tools and tactics to better surf the ICT wave in the professional environment, and develop proper protection strategies to mitigate your exposure to spam in any form.
Inside Anthropotechnology. User and Culture Centered Experience
For the last 40 years, anthropotechnology has concentrated its efforts on the study and improvement of the working and living conditions of populations throughout the world. It guides the actors of the design processes by paying attention to the “human factor”: its social, cultural and environmental components. It therefore values a conception of techniques that respect people and their ways of thinking and acting in specific contexts. This book introduces the reader to design dynamics that combine often conflicting sets of competencies, but that are always anxious to respond to the contexts of the field.
Human Reproduction. Updates and New Horizons
In vitro fertilization (IVF) and other assisted reproductive technologies (ART) have become a significant part of human reproduction, with already one in 50 children worldwide being born through ART and the demand steadily increasing. To accommodate the various kinds of infertility problems, new methods have been developed to increase IVF and ART success rates and it has also become possible to treat sperm, eggs, and embryos in culture to improve reproductive success, to increase the health state of an embryo, and to prevent disease in the developing child. Human Reproduction: Updates and New Horizons focuses on recent developments and new approaches to study egg and sperm cells and embryo development, as well as addressing the increasing demand for IVF and ART to overcome infertility problems of various kinds that are encountered by an increasing number of couples worldwide. The book includes 10 chapters written by experts in their specific fields to provide information on sperm selection techniques and their relevance to ART; In vitro maturation of human oocytes: current practices and future promises; Molecular biology of endometriosis; Novel immunological aspects for the treatment of age-induced ovarian and testicular infertility, other functional diseases, and early and advanced cancer immunotherapy; Mitochondrial manipulation for infertility treatment and disease prevention; Novel imaging techniques to assess gametes and preimplantation embryos; Clinical application of methods to select in vitro fertilized embryos; New horizons/developments in time-lapse morphokinetic analysis of mammalian embryos; The non-human primate model for early human development; Cytoskeletal functions, defects, and dysfunctions affecting human fertilization and embryo development. This book will appeal to a large interdisciplinary audience, including researchers from both the basic science and medical communities. It will be a valuable reference for IVF clinicians, patients and prospective patients who are considering ART procedures, embryologists, cell biologists and students in the field of reproduction.
Geotechnical Engineering. Unsaturated and Saturated Soils
Written by a leader on the subject, Introduction to Geotechnical Engineering is first introductory geotechnical engineering textbook to cover both saturated and unsaturated soil mechanics. Destined to become the next leading text in the field, this book presents a new approach to teaching the subject, based on fundamentals of unsaturated soils, and extending the description of applications of soil mechanics to a wide variety of topics. This groundbreaking work features a number of topics typically left out of undergraduate geotechnical courses.