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[null,"1.","Record Nr.",null,"UNINA9910483807303321"]
[null,null,"Autore",null,"Geng Junping"]
[null,null,"Titolo",null,"Omnidirectional slots antenna / / Junping Geng"]
[null,null,"Pubbl/distr/stampa",null,"Gateway East, Singapore : , : Springer, , [2021]"]
[{"$nulls":4},"Â©2021"]
[null,null,"ISBN",null,"981-15-9089-3"]
[null,null,"Edizione",null,"[1st ed. 2021.]"]
[null,null,"Descrizione fisica",null,"1 online resource (XXV, 170 p. 121 illus., 104 illus. in color.)"]
[null,null,"Disciplina",null,"621.3824"]
[null,null,"Soggetti",null,"Antenna radiation patterns"]
[{"$nulls":4},"Electromagnetic waves - Polarization"]
[{"$nulls":4},"Antennas (Electronics)"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,"Nota di contenuto",null,"Introduction -- Basic Theory of Omnidirectional Antenna and Slot Array -- Principles of Omnidirectional CP Slot Array Antenna -- Principles of Omnidirectional Dual-CP Slot Array Antenna -- Dual CP Polarization Diversity and Space Diversity Antennas Enablaed by a Compact T-shaped Feed Structure -- Circular Truncated Cone Slot Antenna with Circular Polarized Conical Beam -- Half-space Covered Antenna for Air-ground Communication -- A Compact Reconfigurable Coaxial Slot Antenna -- The Omnidirectional/Directional Switchable Antenna based on the Curved Microstrip Antenna with Defected Ground Structure."]
[null,null,null,"Sommario/riassunto","Omnidirectional antenna with high gain, low profile, vertical polarization, even CP polarization is very difficult to design, although it is from the dipole. In this book, a novel idea that the running wave in the coaxial wire is disturbed by the orthogonal slot array on the cylindrical metal shell is introduced, which radiates the CP wave in omni-direction. When feeding on two ends of the coaxial wire respectively, there will appear left hand circularly polarized (LHCP) omnidirectional radiation or right hand circularly polarized (RHCP) omnidirectional radiation. By introducing the T-shaped feed structure, the coaxial wire with slot array can conveniently produce the LHCP and RHCP radiation diversity with one end feeding. In the further, combining with the directional antenna, it will generate the pattern diversity in the half-sphere space. The antenna of the coaxial wire with slot array can further transform into conical CP beam antenna if the coaxial wire becomes into a conical frustum. By introducing the PIN "]
[{"$nulls":4},"diode into the slot, the antenna of the coaxial wire with slot array can radiate the reconfigurable directional beam by switching the states of the PIN diodes. By introducing a novel switchable microwave circuit, the omnidirectional /directional pattern switchable antenna can be realized easily. This book proposes a continues method to develop the potentialities of the omnidirectional antenna. And the readers can study the method or ideas of the omnidirectional antenna, even graft the CP or diversity methods to other antennae."]
[null,"2.","Record Nr.",null,"UNINA9910967985403321"]
[null,null,"Autore",null,"Chase Jonathan M"]
[null,null,"Titolo",null,"Ecological niches : linking classical and contemporary approaches / / Jonathan M. Chase and Mathew A. Leibold"]
[null,null,"Pubbl/distr/stampa",null,"Chicago, : University of Chicago Press, c2003"]
[null,null,"ISBN",null,"9786613150684"]
[{"$nulls":4},"9781283150682"]
[{"$nulls":4},"1283150689"]
[{"$nulls":4},"9780226101811"]
[{"$nulls":4},"0226101819"]
[null,null,"Edizione",null,"[1st ed.]"]
[null,null,"Descrizione fisica",null,"1 online resource (224 p.)"]
[null,null,"Collana",null,"Interspecific interactions"]
[null,null,"Classificazione",null,"WI 3060"]
[null,null,"Disciplina",null,"577.8/2"]
[null,null,"Soggetti",null,"Niche (Ecology)"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","Description based upon print version of record."]
[null,null,null,"Nota di bibliografia","Includes bibliographical references (p. 181-205)."]
[null,null,"Nota di contenuto",null,"1. Introduction : history, context, and purpose -- 2. Revising the niche concept : definitions and mechanistic models -- 3. Comparing classical and contemporary niche theory -- 4. Designs and limitations of empirical approaches to the niche -- 5. Incorporating biological complexities -- 6. Environmental variability in time and space -- 7. Species sorting in communities -- 8. Community succession, assembly, and biodiversity -- 9. Niche relations within ecosystems -- 10. The evolutionary niche -- 11. Conclusions."]
[null,null,null,"Sommario/riassunto","Why do species live where they live? What determines the abundance and diversity of species in a given area? What role do species play in the functioning of entire ecosystems? All of these questions share a single core concept-the ecological niche. Although the niche concept has fallen into disfavor among ecologists in recent years, Jonathan M. Chase and Mathew A. Leibold argue that the niche is an ideal tool with which to unify disparate research and theoretical approaches in contemporary ecology. Chase and Leibold define the niche as including both what an organism needs from its environment and how that organism's activities shape its environment. Drawing on the theory of consumer-resource interactions, as well as its graphical analysis, they develop a framework for understanding niches that is flexible enough to include a variety of small- and large-scale processes, from resource competition, predation, and stress to community structure, "]
[{"$nulls":4},"biodiversity, and ecosystem function. Chase and Leibold's synthetic approach will interest ecologists from a wide range of subdisciplines."]