Download or read book Etude d antennes planaires motifs p riodiques par la th orie des mat riaux BIE written by Sébastien Pioch and published by . This book was released on 2004 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les travaux présentés dans ce mémoire portent sur l'étude d'antennes planaires à motifs périodiques par la théorie des matériaux à BIE. Dans un premier temps, nous proposons une méthode de réduction de la taille d'antennes imprimées à partir de motifs périodiques (type UCPBG). Pour cela, nous modifions les dimensions de la cellule élémentaire afin de ralentir la vitesse de propagation de l'onde dans le réseau. Les diagrammes de bandes sont calculés analytiquement à l'aide de circuits équivalents. Les différentes structures ne fonctionnent pas dans leur première bande interdite car elles sont utilisées en tant qu'élément rayonnant. Puis, nous proposons un nouveau type d'antenne bibande basé sur l'empilement d'une antenne patch et d'une antenne à BIE. Dans la seconde partie, nous cherchons également à obtenir un effet de réduction à l'aide de métamatériaux basés sur des lignes coplanaires chargées périodiquement d'éléments réactifs. Des modèles équivalents sont introduits pour déterminer l'équation de dispersion en vue de localiser les bandes de fréquences interdites. Une étude paramétrique sur la période de la structure montre des fréquences situées à l'intérieur et à l'extérieur du cône de lumière. Pour ce type de structure, la réduction de la longueur résonnante n'a pas été obtenu car le matériau présente une atténuation importante. Dans la dernière partie, on s'intéresse à l'insertion de MEMS RF dans une antenne à fente blindée à l'arrière. Les résultats simulés montrent la possibilité d'avoir une antenne reconfigurable en fréquence sur une octave en modifiant le rapport capacitif de ces composants.
Download or read book How to Hold a Crocodile written by Diagram Group and published by Firefly Books. This book was released on 2003 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explains how to do practical and improbable things, such as how to roast an ox, handle a hamster, photography a fish, play the bagpipes, and vanquish a vampire.].
Download or read book X Ray and Neutron Reflectivity Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Aerospace Electromagnetic Compatibility written by Dr. Reinaldo J. Perez and published by John Wiley & Sons. This book was released on 2018-11-30 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive resource that explores electromagnetic compatibility (EMC) for aerospace systems Handbook of Aerospace Electromagnetic Compatibility is a groundbreaking book on EMC for aerospace systems that addresses both aircraft and space vehicles. With contributions from an international panel of aerospace EMC experts, this important text deals with the testing of spacecraft components and subsystems, analysis of crosstalk and field coupling, aircraft communication systems, and much more. The text also includes information on lightning effects and testing, as well as guidance on design principles and techniques for lightning protection. The book offers an introduction to E3 models and techniques in aerospace systems and explores EMP effects on and technology for aerospace systems. Filled with the most up-to-date information, illustrative examples, descriptive figures, and helpful scenarios, Handbook of Aerospace Electromagnetic Compatibility is designed to be a practical information source. This vital guide to electromagnetic compatibility: • Provides information on a range of topics including grounding, coupling, test procedures, standards, and requirements • Offers discussions on standards for aerospace applications • Addresses aerospace EMC through the use of testing and theoretical approaches Written for EMC engineers and practitioners, Handbook of Aerospace Electromagnetic Compatibility is a critical text for understanding EMC for aerospace systems.
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Download or read book Analecta Or Materials For a History of Remarkable Providences Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.
Download or read book Caterpillar Club Survivor written by Ross Smith Stagg and published by . This book was released on 2007 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spitfire pilot Ross Smith Stagg was one of 33 Allied airmen to defend Darwin against Japanese invasion on May 2, 1943. As one of 14 pilots shot down or experience mechanical failure in the ensuing battle, he parachuted into the sea 18 km from land, 100 km southwest of Darwin in the Fogg Bay area. He reached the shore in a dinghy. For the next 15 days he trudged through inhospitable country in a futile attempt to return to Strauss airbase. What should have been a few days walk turned into his worst possible nightmare as he stumbled aimlessly through mosquito and crocodile infested swamps. "It was almost six days I'd been without sleep, apart from a short period of unconsciousness and those few moments before I fell out of that tree," he said. " I became demented by the cavalcade of mosquitoes and hallucinating badly". His experience was only to worsen - he waded halfway across a tidal river to be confronted by a large saltie. Darwin historian John Haslett help Stagg map the original route by retracing his steps, even managing to relocate an American Kittyhawk Stagg found crashed in the middle of nowhere.
Download or read book Nutrition and Diet Therapy written by Corinne Balog Cataldo and published by Brooks Cole. This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With engaging coverage of core nutrition concepts and up-to-date clinical content, Cataldo, DeBruyne, and Whitney's text provides the ideal introduction to nutrition and diet therapy. From basic facts and practical information to assessments and case studies, this Sixth Edition provides the contemporary and comprehensive approach you need to gain knowledge and achieve confidence in the course.
