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1. |
Record Nr. |
UNINA9910457318503321 |
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Autore |
Miron Douglas B |
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Titolo |
Small antenna design [[electronic resource] /] / by Douglas B. Miron |
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Pubbl/distr/stampa |
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Burlington, MA, : Newnes/Elsevier, c2006 |
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ISBN |
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1-281-01467-2 |
9786611014674 |
0-08-049814-0 |
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Edizione |
[1st edition] |
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Descrizione fisica |
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1 online resource (304 p.) |
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Collana |
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Communications engineering series |
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Disciplina |
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Soggetti |
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Radio - Antennas - Design and construction |
Electronic books. |
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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 and index. |
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Nota di contenuto |
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Front Cover; Small Antenna Design; Copyright Page; Contents; Preface; About the Author; What's on the CD-ROM?; Chapter 1: Introduction; 1.1 What Is Small?; 1.2 What Are the Problems?; 1.3 Some Historical Small Antenna Types and Applications; 1.4 Some Present and Future Small Antennas; References; Chapter 2: Antenna Fundamentals I; 2.1 Electromagnetic Waves; 2.2 Polarization; 2.3 The Short Dipole; 2.4 The Small Loop; 2.5 Directionality, Efficiency, and Gain; References; Chapter 2 Problems; Chapter 3: Antenna Fundamentals II; 3.1 Bandwidth and Quality Factor, Q |
3.2 Impedance Matching and System Efficiency3.3 Reception; 3.4 Ground Effects; 3.5 Improvements; References; Chapter 3 Problems; Chapter 4: Introduction to Numerical Modeling of Wire Antennas; 4.1 General Concepts; 4.2 The Mathematical Basics of the Numerical Electromagnetic Code (NEC); 4.3 Using NEC in the Command Window; 4.4 Modeling Guidelines; 4.5 NEC in a Graphical User Interface (GUI); 4.6 Examples from Chapters 2 and 3; References; Chapter 4 Problems; Chapter 5: Programmed Modeling; 5.0 Introduction; 5.1 Using Wire-List Generators in NEC; 5.2 Using Code to Generate a Wire List |
Chapter 5 ProblemsChapter 6: Open-Ended Antennas; 6.0 Introduction; 6.1 Thick Monopoles; 6.2 Top Loading; 6.3 Coil Loading; 6.4 Using Resonance; 6.5 Summary; References; Chapter 6 Problems; Chapter 7: |
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Loops and Other Closed-Wire Antennas; 7.0 Introduction; 7.1 Thick Loops; 7.2 Solenoid Antennas; 7.3 The Contrawound Toroidal Helix Antenna (CTHA); 7.4 The Folded Spherical Helix Monopole; 7.5 Final Comments; References; Chapter 7 Problems; Chapter 8: Receiving Antennas; 8.0 Introduction; 8.1 External Noise; 8.2 The Ferrite Rod Antenna; 8.3 Active Receiving Antennas; References |
Chapter 8 ProblemsChapter 9: Measurements; 9.1 What Are You Measuring?; 9.2 Measurements Through a Transmission Line; 9.3 Ranges and Test Enclosures; 9.4 The Wheeler Cap and Variations; References; Chapter 9 Problems; Appendix A: The Mathematics of Antenna Orientation; A.1 Unit-Vector and Coordinate Variable Relations; A.2 The Horizontal Dipole; A.3 The Vertical Loop; Appendix A Problems; Appendix B: The Parallel-Ray Approximation; Appendix B Problems; Appendix C: The Small Loop; Appendix C Problems; Appendix D: The Proximity Effect; D.1 Current Distribution; D.2 Power and Resistance |
ReferencesAppendix E: What Every EE Student Should Know About Mathematics by the Senior Year; E.1 What Is Mathematics to an Engineer?; E.2 The Process Is as Important as the Result; E.3 Facts and Idioms; E.4 Integrals and Derivatives; E.5 Radians or Degrees?; E.6 Matrix Notation and Operations; E.7 Answers for Section E.3; Index; Elsevier Science CD-ROM License Agreement |
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Sommario/riassunto |
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As wireless devices and systems get both smaller and more ubiquitous, the demand for effective but small antennas is rapidly increasing. This book will describe the theory behind effective small antenna design and give design techniques and examples for small antennas for different operating frequencies. Design techniques are given for the entire radio spectrum, from a very hundred kilohertz to the gigahertz range.Unlike other antenna books which are heavily mathematical and theoretical, Douglas Miron keeps mathematics to the absolute minimum required to explain design techniques. Grou |
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2. |
Record Nr. |
UNINA9910557371803321 |
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Autore |
Chin Joong Hyoun |
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Titolo |
Recent Advances in Genetics and Breeding of Major Staple Food Crops |
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Pubbl/distr/stampa |
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Basel, Switzerland, : MDPI - Multidisciplinary Digital Publishing Institute, 2021 |
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Descrizione fisica |
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1 electronic resource (314 p.) |
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Soggetti |
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Research & information: general |
Biology, life sciences |
Technology, engineering, agriculture |
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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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Sommario/riassunto |
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To meet the global food demand of an increasing population, food production has to be increased by 60% by 2050. The main production constraints, such as climate change, biotic stresses, abiotic stresses, soil nutrition deficiency problems, problematic soils, etc., have to be addressed on an urgent basis. More than 50% of human calories are from three major cereals: rice, wheat, and maize. The harnessing of genetic diversity by novel allele mining assisted by recent advances in biotechnological and bioinformatics tools will enhance the utilization of the hidden treasures in the gene bank. Technological advances in plant breeding will provide some solutions for the biofortification, stress resistance, yield potential, and quality improvement in staple crops. The elucidation of the genetic, physiological, and molecular basis of useful traits and the improvement of the improved donors containing multiple traits are key activities for variety development. High-throughput genotyping systems assisted by bioinformatics and data science provide efficient and easy tools for geneticists and breeders. Recently, new breeding techniques applied in some food crops have become game-changers in the global food crop market. With this background, we invited 18 eminent researchers working on food crops from across the world to contribute their high-quality original research |
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manuscripts. The research studies covered modern food crop genetics and breeding. |
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