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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Zmapování toku řeky Želivky v rámci studia ekologických invazí a invazních netýkavek (\kur{Impatiens glandulifera} a \kur{I. parviflora}) / Mapping the banks of the Želivka river within the framework of studying ecological invasions and invasive species \kur{I. glandulifera} and \kur{I. parviflora}

URBAN, Miroslav January 2011 (has links)
The aim of the study was to study the invasion ecology and the to study the invasion of two species of the genus Impatiens, namely I. glandulifera and I. parviflora. I then chose the right bank of the Želivka river in the Czech-Bohemian highlands to study and survey the plant association and population of two mentioned species. Consequently I focused my study on the river biotope and the role of invasive species in it. Further I have worked up a research summary on the ecology of the invasion and the role of the above mentioned species in the riparian biotopes.
2

Contribuições a modelagem, analise e simulação de canais de desvanecimento / Contributions to the modeling, analysis, and simulation of fading channels

Santos Filho, José Cândido Silveira, 1979- 16 November 2006 (has links)
Orientador: Michel Daoud Yacoub / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-07T23:52:12Z (GMT). No. of bitstreams: 1 SantosFilho_JoseCandidoSilveira_D.pdf: 1465914 bytes, checksum: 30b3ae8d49f9e0566332c17202cc27cb (MD5) Previous issue date: 2006 / Resumo: Este trabalho provê as seguintes contribuições ao estudo de canais de desvanecimento: (i) aproximações em forma fechada para a função densidade de probabilidade e a função distribuição acumulada de somas de envoltórias independentes sob desvanecimento Nakagami, Rice, Hoyt, Weibull ou lognormal; (ii) expressões gerais para a taxa e duração médias de desvanecimento do combinador de diversidade por seleção pura em canais de desvanecimento arbitrários; (iii) expressões gerais para a taxa e duração médias de desvanecimento dos combinadores de diversidade por seleção pura, ganho igual e razão máxima em canais Ricianos correlacionados e (iv) simulador de envoltória para canais de desvanecimento Nakagami, aplicável a valores arbitrários do parâmetro de desvanecimento e cenários anisotrópicos de propagação / Abstract: This work provides the following contributions to the study of fading channels: (i) closed-form approximations to the probability density function and the cumulative distribution function of sums of independent envelopes under Nakagami, Rice, Hoyt, Weibull, or lognormal fading; (ii) general expressions for the average fade rate and the average fade duration of pure selection combining over arbitrary fading channels; (iii) general expressions for the average fade rate and the average fade duration of pure selection, equal-gain, and maximal-ratio combining over correlated Ricean channels, and (iv) envelope simulator for Nakagami fading channels, applicable to arbitrary values of fading parameter and nonisotropic propagation scenarios / Doutorado / Telecomunicações e Telemática / Doutor em Engenharia Elétrica

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