Making a difference : a comparative view of the role of the internet in election politics / / edited by Stephen Ward [and three others]

• Record Nr.: UNINA9910452874103321
• Pubbl/distr/stampa: Lanham, Maryland ; ; Plymouth, England : , : Lexington Books, , 2008; ©2008
• ISBN: 0-7391-2101-4; 1-4616-3375-3
• Descrizione fisica: 1 online resource (317 p.)
• Collana: Lexington Studies in Political Communication
• Disciplina: 324.7/3
• Soggetti: Internet in political campaigns; Elections - Computer network resources; Electronic books.
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references.
• Nota di contenuto: 10 Netherlands: Digital Campaigning in the 2002 and 2003 Parliamentary Elections Gerrit Voerman and Marcel Boogers11 Italy: The Evolution of E-campaigning 1996-2006 Sara Bentivegna; 12 Germany: Online Campaign Professionalism in the 2002 and 2005 National Elections Eva Johanna Schweitzer; Conclusion; Bibliography; Contributors
• Sommario/riassunto: This book is a cross-national analysis of the role of the Internet in elections. It examines the role of context in shaping candidate and party usage of the Internet in democratic electoral systems.

Orthogonal methods for array synthesis [[electronic resource] ] : theory and the ORAMA computer tool / / John N. Sahalos

• Record Nr.: UNINA9910143728903321
• Autore: Sahalos John N
• Pubbl/distr/stampa: Chichester, : John Wiley, c2006
• ISBN: 1-280-73955-X; 9786610739554; 0-470-02854-8; 1-60119-513-3; 0-470-02853-X
• Descrizione fisica: 1 online resource (230 p.)
• Disciplina: 621.3824; 621.384135
• Soggetti: Antenna arrays - Design and construction; Antenna arrays - Mathematical models; Electronic books.
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: ORTHOGONAL METHODS FOR ARRAY SYNTHESIS; Contents; Preface; 1 Antennas and Antenna Arrays; 1.1 Introduction; 1.2 Antenna Array Factor; 1.3 Elements and Array Types; 1.4 Antenna Parameters and Indices; 1.4.1 Radiated Power; 1.4.2 Radiation Intensity; 1.4.3 Directivity; 1.4.4 Antenna Efficiency; 1.4.5 Gain; 1.4.6 Antenna Patterns; 1.4.7 Antenna Effective Aperture; 1.4.8 Beam Efficiency; 1.4.9 Signal-to-Noise Ratio; 1.4.10 Quality Factor; 1.4.11 Sensitivity Factor; 1.5 Antenna Input Impedance; 1.6 Antenna Arrays Classification; 1.7 Array Factor Classification; References; 2 Arrays: Linear, Planar, 3D and Conformal2.1 Introduction; 2.2 Linear Arrays; 2.3 Uniform Linear Arrays; 2.4 Chebyshev Linear Arrays; 2.4.1 Chebyshev Polynomials; 2.4.2 Dolph-Chebyshev Arrays; 2.4.3 Riblet Arrays; 2.4.4 Other Chebyshev Arrays; 2.5 Linear Arrays from Sampling or Root Matching of Line Sources; 2.5.1 Simple Linear Distributions; 2.5.2 Taylor Distribution (Chebyshev Error); 2.5.3 Taylor One-parameter Distribution; 2.5.4 Bayliss Distribution; 2.5.5 Modified ; Patterns by Iteration; 2.6 Planar Arrays; 2.6.1 Planar Chebyshev Arrays; 2.6.2 Circular Arrays; 2.6.3 Ring Arrays; 2.7 3-D Arrays2.8 Conformal Arrays; References; 3 Pattern Synthesis for Arrays; 3.1 Introduction; 3.2 Uniform Linear Array Synthesis; 3.3 Chebyshev Array Synthesis; 3.4 Synthesis by Sampling or by Root Matching; 3.5 Synthesis by Fourier Transform; 3.6 The Woodward - Lawson (WL) Method; 3.7 Array Synthesis as an Optimization Problem; 3.7.1 Optimization of an Array Index; 3.7.2 Optimization by Simplex and Gradient Methods; 3.7.3 Optimization by Simulated Annealing Method; 3.7.4 Optimization by Genetic Algorithms (GAs); 3.7.5 Space and Time Optimization/Smart Antennas; 3.8 Synthesis by Convolution of Linear, Planar and 3-D ArraysReferences; 4 The Orthogonal Methods; 4.1 Introduction; 4.2 Synthesis of Non-uniformly Spaced Linear Arrays: The Matrix Inversion Method; 4.3 Synthesis of Non-uniformly Spaced Linear Arrays: The Orthogonal Method; 4.3.1 Examples of Synthesis of Linear Arrays with the Orthogonal Method; 4.4 Synthesis of Non-uniformly Spaced Linear Arrays Subject to Constraints: The Constrained Orthogonal Method; 4.4.1 Synthesis Under Null Constraints on Pattern Levels; 4.4.2 Synthesis Subject to Minimization of the Pattern Level in Certain Angular Regions4.4.3 Synthesis Subject to Constraints on SLLs; 4.5 Quantized Excitation and Geometry Synthesis of a Linear Array: The Orthogonal Perturbation Method; 4.5.1 Detailed Analysis and Examples; 4.6 Synthesis of Non-uniformly Spaced Planar Arrays: The Orthogonal Method; 4.7 Synthesis of Non-uniformly Spaced 3-D Arrays: The Orthogonal Method; 4.7.1 Detailed Analysis and Examples; 4.8 Synthesis of Non-uniformly Spaced 3-D Arrays with Arbitrarily Oriented Dipoles: The Non-parallel Orthogonal Method; 4.9 Synthesis of Arrays of Wire Antennas: The MoM Orthogonal Method
• Sommario/riassunto: The first time that such a complete systematic analysis of the mathematical and numerical techniques related to the orthogonal methods has been given. With the explosion of the wireless world, greater emphasis than ever before is being placed on the effective design of antennas. Orthogonal Methods for Array Synthesis outlines several procedures of orthogonal methods suitable for antenna array synthesis. The book presents a simple approach to the design of antenna arrays to enable the reader to use the classical Orthogonal Method for synthesis of linear arrays. This theory-bas