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1. |
Record Nr. |
UNINA990005679800403321 |
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Autore |
Illich, Ivan <1926-2002> |
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Titolo |
Descolarizzare la società / Ivan Illich |
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Pubbl/distr/stampa |
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Milano : Arnaldo Mondadori, 1973- |
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Descrizione fisica |
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Collana |
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L'immagine del presente ; 20 |
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Disciplina |
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Locazione |
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Collocazione |
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306.432 ILL 1 |
306.432 ILL 1 BIS |
306.432 ILL 1 TER |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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In cop.: Per una alternativa all'istituzione scolastica |
traduzione di Ettore Capriolo |
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2. |
Record Nr. |
UNINA9910830704703321 |
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Autore |
Barue Gerard <1945-> |
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Titolo |
Microwave engineering : land & space radiocommunications / / by Gérard Barué |
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Pubbl/distr/stampa |
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Hoboken, New Jersey : , : J. Wiley & Sons, , c2008 |
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[Piscataqay, New Jersey] : , : IEEE Xplore, , [2007] |
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ISBN |
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1-281-73280-X |
9786611732806 |
0-470-29099-4 |
0-470-29098-6 |
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Edizione |
[1st edition] |
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Descrizione fisica |
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1 online resource (457 p.) |
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Collana |
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Wiley survival guides in engineering and science ; ; 9 |
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Disciplina |
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621.381/3 |
621.3813 |
621.384 |
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Soggetti |
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Microwave communication systems |
Microwaves |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references (p. 425-426) and index. |
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Nota di contenuto |
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Foreword. -- Preface. -- Acknowledgments. -- 1. Electromagnetic Wave Propagation. -- 1.1. Properties of Plane Electromagnetic Wave. -- 1.2. Radiant Continuous Aperture. -- 1.3. General Characteristics of Antennas. -- 1.4. Free-Space Loss and Electromagnetic Field Strength. -- 1.5. Reflector and Passive Repeater. -- 1.6. Model of Propagation. -- 1.7. Reflection and Refraction. -- 1.8. Influence of Atmosphere. -- 1.9. Propagation by Diffraction. -- 1.10. Attenuation by Atmospheric Gases. -- 1.11. Attenuation and Depolarization by Hydrometeors. -- 1.12. Influence of Ionosphere. -- 1.13. Thermal Radiation. -- 1.14. Probability Distributions. -- 2. Principles of Digital Communication Systems. -- 2.1. Signal Processing. -- 2.2. Thermal Noise. -- 2.3. Digital Communication Systems Design. -- 3. Microwave Line-of-Sight Systems. -- 3.1. Engineering of Line-of-Sight Systems. -- 3.2. Design of Line-of-Sight Microwave Radio Link: Interferometric Method. -- 3.3. Link Budget. -- 3.4. Methods of Prediction. -- 3.5. Protection against Jamming. -- 3.6. Frequency Reuse Techniques. -- 3.7. Comparison |
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between Various Diversity Techniques. -- 3.8. Availability of Microwave Line-of-Sight Systems. -- 4. Microwave Transhorizon Systems. -- 4.1. Engineering of Transhorizon Systems. -- 4.2. Method of Prediction. -- 4.3. Link Budget. -- 4.4. Examples of Transhorizon Links. -- 4.5. Other Models of Prediction. -- 4.6. Total Availability of Troposcatter Links. -- 5. Satellite Communications. -- 5.1. Space Geometry of Satellite Systems. -- 5.2. Configuration of Satellite Communication System. -- 5.3. Link Budget. -- 5.4. Method of Prediction. -- References. -- Index. |
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Sommario/riassunto |
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Everything readers need to implement and support a wireless point-to-point communications environment In order to cope with the tremendous explosion of the telecommunications market, the field of wireless communications has greatly expanded in the past fifty years, especially in the domains of microwave radio systems including line-of-sight, satellites, and tropospheric-scatter. Now, Microwave Engineering: Land & Space Radio- communications answers the growing worldwide demand for an authoritative book on this important and emerging subject area. In five succinct chapters, the book introduces students and practicing engineers to the main propagation phenomena that are encountered and that must be considered in the design and planning for any given system type and frequency of operation: . Electromagnetic wave propagation-An introduction to the fundamentaltheory of radiation and propagation of electromagnetic waves, polarization, antenna properties, free space attenuation, atmospheric refractivity, diffraction, reflection, multipath and scattering mechanisms, hydrometeor effects, and probability distributions . Principles of digital communication systems-Modulation techniques, signal processing, error probability, spectral characteristics, spectrum efficiency, thermal noise, intermodulation, jamming, and interference . Microwave line-of-sight systems-Path profile, flat fading and frequency-selective fading, interferometric method for space and frequency diversity techniques, International Standards and ITU Recommendations, optimization of the frequency-plan resource, link budget, quality, reliability, and availability . Microwave transhorizon systems-Design of beyond-the-horizon communication systems, properties of scattering and diffraction modes, multipath statistical relations, long-term and short-term field strength variations, quality of service, optimization of antenna alignment, and experimental analysis of various diversity and combining methods . Satellite communications-Design of satellite communications systems, orbital parameters, Earth-satellite geometry, uplink and downlink budgets for both space and Earth segments, and total system noise temperature Microwave Engineering: Land & Space Radiocommunications is suitable for engineers involved in wireless telecommunications, as well as for students and members of various seminars and workshops. |
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3. |
Record Nr. |
UNINA9910978382803321 |
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Autore |
Weinstein Galina |
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Titolo |
Einstein's Legacy : From General Relativity to Black Hole Mysteries / / by Galina Weinstein |
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Pubbl/distr/stampa |
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Cham : , : Springer Nature Switzerland : , : Imprint : Springer, , 2024 |
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ISBN |
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Edizione |
[1st ed. 2024.] |
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Descrizione fisica |
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1 online resource (629 pages) |
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Collana |
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History of Physics, , 2730-7557 |
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Disciplina |
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Soggetti |
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Physics - History |
General relativity (Physics) |
Gravitation |
History of Physics and Astronomy |
General Relativity |
Gravitational Physics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di contenuto |
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Journey Through Relativity 1912-1916: From Covariance to Entwurf and Back Again -- Schwarzschild, Droste, and Nordström Solve Einstein’s Field Equations -- Ripples, Rotations, and the Kerr Black Hole -- Challenging General Relativity: Black Hole Thermodynamics -- Addressing the Conflict Between Quantum Mechanics and General Relativity. |
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Sommario/riassunto |
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This book offers a comprehensive exploration into the intertwined realms of Einstein's theory of general relativity, the discoveries of black holes, and the quantum conundrums that challenge our understanding of the universe. It delves into the fascinating journey from the birth of general relativity to the cutting-edge debates surrounding black holes, wormholes, and quantum physics. The narrative weaves through the historical milestones, including Schwarzschild's 1916 solution, the emergence of black holes in theoretical physics, and the ongoing quest to reconcile general relativity with quantum mechanics. Central to the book is exploring the information paradox and its implications for modern physics, shedding light on the profound questions and |
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theoretical challenges that have captivated physicists for decades. It also critically examines the ER=EPR conjecture, a pivotal idea proposed by Leonard Susskind and Juan Maldacena, which suggests a deep connection between entangled quantumparticles and the structure of spacetime. In addition, the book engages with contemporary theoretical experiments on wormholes, framed within Nancy Cartwright's philosophical theories, offering a unique perspective on the reliability and interpretation of these groundbreaking scientific concepts. The main topics covered are not only crucial for understanding the universe but also embody the ongoing quest for a unified theory in physics. They represent the cutting edge of scientific inquiry, where the mysteries of black holes, the fabric of spacetime, and the perplexities of quantum mechanics converge. This book is designed for physicists, historians of science, and academically inclined readers interested in the evolution of theoretical physics and the groundbreaking ideas that have shaped our understanding of the cosmos. It offers a detailed yet accessible narrative, making it an invaluable resource for anyone seeking to grasp the complexities and triumphs of modern physics. |
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