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Cesaro$d2012 215 $a77 p.$d21 cm 225 1 $aStudia Oplontina$iNuova serie 300 $aIn basso al front.: 11 novembre 2011 610 0 $aOrsini Natale, Maria <1928-2010> 610 0 $aDe Laurentiis, Dino <1919-2010> 676 $a853.9109 702 1$aElefante,$bMaria 801 0$aIT$bUNINA$gRICA$2UNIMARC 901 $aBK 912 $a990009785430403321 952 $a853.9109 ELE 1$bBibl.64391$fFLFBC 959 $aFLFBC 996 $aAtti del seminario di arte visiva, scrittura e comunicazione$9833105 997 $aUNINA LEADER 01387nam 2200361 450 001 000016526 005 20050718115600.0 100 $a20030915d1973----km-y0itay0103----ba 101 0 $aeng 102 $aUS 200 1 $aCardinal spline interpolation$fI. J. Schoenberg 210 $aPhiladelphia$cSociety for Industrial and Applied Mathematics$dc1973 215 $aVI, 125 p.$d25 cm. 225 2 $aRegional conference series in mathematics$v12 410 0$12001$aRegional conference series in mathematics 606 $aInterpolazione (matematica) 676 $a511.42$v(21. ed.)$9Approssimazioni e sviluppi. Metodi 691 $a65D07$9Numerical analysis. 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[et al.] 210 $aLondon ;$aNewport Beach, CA $cISTE$d2006 215 $a1 online resource (221 p.) 225 1 $aISTE ;$vv.91 300 $aFirst published in France in 2004 by Hermes Science/Lavoisier entitled "Optique sans fil: propagation et communication." 311 $a1-905209-02-9 320 $aIncludes bibliographical references (p. [209]-215) and index. 327 $aFree-Space Optics; Table of Contents; Introduction; Chapter 1. History of Optical Telecommunications; 1.1. Some definitions; 1.1.1. Telecommunication; 1.1.2. Optical transmission; 1.1.3. Radio or Hertzian waves; 1.2. The prehistory of telecommunications; 1.3. The optical air telegraph; 1.4. The code; 1.5. The optical telegraph; 1.6. The heliograph or solar telegraph: a portable telecommunication system; 1.7. Alexander Graham Bell's photophone; Chapter 2. Basic Principles of Electromagnetism; 2.1. Introduction; 2.2. Maxwell's equations in an unspecified medium 327 $a2.3. Propagation of electromagnetic waves in an isotropic and linear homogeneous medium2.4. Energy associated with a wave; 2.5. Propagation of a wave in a non-homogeneous medium; 2.6. Coherent and incoherent waves; 2.7. Relations between classical electromagnetism and geometrical optics; 2.8. The electromagnetic spectrum; 2.9. Units and scales; 2.10. Examples of sources in the visible light and near visible light; 2.11. Conclusion; Chapter 3. Emission and Reception of Optical Beams; 3.1. Foreword; 3.2. Introduction; 3.3. Radiometry: basic concepts 327 $a3.4. Optical spectral windows, materials and eye-safety3.5. Transmitters; 3.5.1. Broad spectrum incoherent light emitting diodes; 3.5.1.1. Structures; 3.5.1.2. Near and far field patterns; 3.5.1.3. Spectral characteristics; 3.5.1.4. Electrical and optical characteristics; 3.5.2. Laser diodes: high radiant power output, coherent waves; 3.5.2.1. Structures; 3.5.2.2. "(?transmitted )/(Iinjected) characteristic": static and dynamic; 3.5.2.3. Spectra and near field patterns; 3.5.2.4. Spectral and modal instabilities and light intensity noise 327 $a3.5.3. Use of amplifiers with "rare earth ion" doped fibers3.6. Photodetectors; 3.6.1. Optical spectral range and materials; 3.6.2. Principle of operation and structures; 3.6.2.1. Surface phenomena: optical reflection, charge mobility and current leakage; 3.6.2.2. Absorption and conduction: semiconductor junctions; 3.6.3. Responsivity, response time, junction capacity and dark current; 3.6.4. Photomultipliers and semiconductor avalanche photodiodes; Chapter 4. Line of Sight Propagation; 4.1. Influence of the propagation environment; 4.1.1. Atmospheric absorption; 4.1.2. Atmospheric scattering 327 $a4.1.3. Extinction and total spectral transmission4.1.4. Earth's atmosphere; 4.1.4.1. Atmospheric composition; 4.1.4.2. Aerosols; 4.2. Visibility; 4.2.1. Generalities; 4.2.1.1. Definitions; 4.2.1.2. Units and scales; 4.2.1.3. Meteorology needs; 4.2.1.4. Measurement methods; 4.2.2. Visual estimate of the meteorological optical range; 4.2.2.1. General; 4.2.2.2. Estimate of the day time meteorological optical range; 4.2.2.3. Estimate of the night time meteorological optical range; 4.2.2.4. Estimate of the meteorological optical range in the absence of distant reference markers 327 $a4.2.3. Meteorological optical range measurement instruments 330 $aFree space optics is a telecommunications technique which is already being used for everyday exchange of information and has many advantages over other techniques (bandwidth, low cost, mobility of the equipment, security, etc.); within the next decade, it is likely to become an integral and essential part of data-processing architectures and telecommunications.A history of wireless optical telecommunications is given, together with a recapitulation of the application of the principles of electromagnetism to free-space optics. 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