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ABSTRACT Graywater is an alternative method to increase the water supply for agricultural production in semi-arid regions. The objective of this study was to evaluate the effects of different irrigation depths of graywater on the gas exchanges and phytomass of millet plants with and without organic fertilization. The research was conducted under greenhouse conditions in Serra Talhada municipality in semiarid region of Brazil, in a randomized complete block design with a factorial (4 × 2 + 1) plot and three replicates. The first factor corresponded to graywater irrigation depth equivalent to 25, 50, 75 and 100% of the available water content of the soil, and the second factor was the addition of bovine manure as fertilizer (0 and 34 Mg ha-1), and a control (irrigation with low-salinity water). Irrigation with graywater effluent did not promote adverse effects on gas exchanges and phytomass accumulation; however, it also did not provide enough nutrients to promote increase in these variables. The reduction in irrigation depth caused a decrease in gas exchange from 45 days after the application of the treatments. The basal tiller mass was the most favored plant component due to organic fertilization.

RESUMO A água cinza é um método alternativo para aumentar a oferta hídrica para produção agrícola nas regiões semiáridas. O objetivo deste estudo foi avaliar os efeitos de diferentes lâminas de irrigação de água cinza nas trocas gasosas e acúmulo de fitomassa do milheto com e sem adubação orgânica. A pesquisa foi conduzida em condições de casa de vegetação em Serra Talhada-PE, municipio na região semiárida do Brasil, em delineamento de blocos casualizados em esquema fatorial (4 × 2 + 1) e três repetições. O primeiro fator correspondeu à lâmina de irrigação com água cinza equivalente a 25, 50, 75 e 100% de água disponível do solo, e o segundo fator a adição de esterco bovino como fertilizante (0 e 34 Mg ha-1), e um controle (irrigação com água de baixa salinidade). A irrigação com efluente de água cinza não promove efeitos negativos nas trocas gasosas e acúmulo de fitomassa, contudo, também não disponibiliza nutrientes suficientes para incrementar essas variáveis. A redução das lâminas de irrigação causou diminuição das trocas gasosas a partir dos 45 dias após aplicação dos tratamentos. A massa de perfilhos basais foi o componente da planta mais favorecida pela adubação orgânica.

https://doi.org/10.1590/1807-1929/agriambi.v26n2p111-118

Métodos para avaliação da efetividade de vacinas para COVID-19 com ênfase em abordagens quase-experimentais
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Pescarini, Julia Moreira

; Teixeira, Camila Silveira Silva

; Cruz, Enny Paixão

; Ortelan, Naia

; Pinto, Priscila Fernanda Porto Scaff

; Ferreira, Andrêa Jacqueline Fortes

; Alves, Flavia Jôse Oliveira

; Pinto Junior, Elzo Pereira

; Falcão, Ila Rocha

; Rocha, Aline dos Santos

; Silva, Nivea Bispo da

; Ortiz, Renzo Flores

; Saavedra, Ramon da Costa

; Oliveira, Vinicius de Araújo

; Ribeiro-Silva, Rita de Cássia

; Ichihara, Maria Yury Travassos

; Boaventura, Viviane

; Barral Netto, Manoel

; Kerr, Ligia Regina Franco Sansigolo

; Werneck, Guilherme Loureiro

; Barreto, Mauricio L.

Ciência & Saúde Coletiva

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nov 2021, Volume 26 N. 11 Pages 5599 - 5614

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

Abstract The evaluation of vaccine effectiveness is conducted with real-world data. They are essential to monitor the performance of vaccination programmes over time, and in the context of the emergence of new variants. Until now, the effectiveness of COVID-19 vaccines has been assessed based on classic methods, such as cohort and test-negative case-control studies, which may often not allow for adequate control of inherent biases in the assignment of vaccination campaigns. The aim of this review was to discuss the study designs available to evaluate vaccine effectiveness, highlighting quasi-experimental studies, which seek to mimic randomized trials, by introducing an exogenous component to allocate to treatment, in addition to the advantages, limitations, and applicability in the context of Brazilian data. The use of quasi-experimental approaches, such as interrupted time series, difference-in-differences, propensity scores, instrumental variables, and regression discontinuity design, are relevant due to the possibility of providing more accurate estimates of COVID-19 vaccine effectiveness. This is especially important in scenarios such as the Brazilian, which characterized by the use of various vaccines, with the respective numbers and intervals between doses, applied to different age groups, and introduced at different times during the pandemic.

Resumo A avalição da efetividade de vacinas é feita com dados do mundo real e é essencial para monitorar o desempenho dos programas de vacinação ao longo do tempo bem como frente a novas variantes. Até o momento, a avaliação da efetividade das vacinas para COVID-19 tem sido baseada em métodos clássicos como estudos de coorte e caso controle teste-negativo, que muitas vezes podem não permitir o adequado controle dos vieses intrínsecos da alocação das campanhas de vacinação. O objetivo dessa revisão foi discutir os desenhos de estudo disponíveis para avaliação de efetividade das vacinas, enfatizando os estudos quase-experimentais, que buscam mimetizar os estudos aleatorizados ao introduzir um componente exógeno para atribuição ao tratamento, bem como suas vantagens, limitações e aplicabilidade no contexto dos dados brasileiros. O emprego de métodos quase-experimentais, incluindo as séries temporais interrompidas, o método de diferença em diferenças, escore de propensão, variáveis instrumentais e regressão descontínua, são relevantes pela possibilidade de gerar estimativas mais acuradas da efetividade de vacinas para COVID-19 em cenários como o brasileiro, que se caracteriza pelo uso de várias vacinas, com respectivos número e intervalos entre doses, aplicadas em diferentes faixas etárias e em diferentes momentos da pandemia.

https://doi.org/10.1590/1413-812320212611.18622021

[SciELO Preprints] - Strengthening the surveillance and information activities is urgent and essential to reduce the transmission force of SARS-CoV-2
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Teixeira, Maria Glória Kerr, Ligia Regina Franco Sansigolo Ximenes, Ricardo Arraes de Alencar Almeida, Rosa Lívia Freitas de Ichihara, Maria Yury Albuquerque, Maria de Fátima Militão de Aquino, Estela M L Werneck, Guilherme Carmo, Eduardo Hage Medronho, Roberto Andrade Oliveira, Wanderson Kleber de Henriques, Claudio Maierovitch Pessanha Kendall, Carl Silva, Antônio Augusto Moura da Almeida-Filho, Naomar M. Souza, Wayner Vieira de Veras , Maria Amelia de Sousa Mascena Penna, Gerson Oliveira Silva , Gulnar Azevedo e Brandão Filho, Sinval Pinto Barreto, Maurício L.

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Publication date: 2021-08-17

Abstract: En Pt

N/A

https://doi.org/10.1590/1980-549720210049

Proposed Technique of Analysis for Absorber/Transmitter Frequency Selective Surfaces
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Santos, Eliel P. dos

; Campos, Antonio L. P. S.

; Gomes Neto, Alfredo

; Silva, Maurício W. B.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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jun 2021, Volume 20 N. 2 Pages 435 - 444

Abstract: En | Text: En | PDF: En

Abstract In this paper, we propose a simple technique to analyze absorber/transmitter frequency selective surfaces (FSS). The structure is formed by two FSS, one resistive and one conductive. Both FSS are printed on an FR4 dielectric substrate. The square loop and crossed dipole are the geometries considered in this paper. The technique combines two simple approaches, the equivalent circuit method, and the scattering matrix method. Two prototypes were built for validation purposes. Simulated and measured results are in good agreement.

https://doi.org/10.1590/2179-10742021v20i21004

Economic nitrogen doses via fertigation for corn cultivation in a semiarid environment
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Souza, Ênio Gomes Flôr

; Cruz, Ellen Abreu da

; França, Rafaela Félix da

; Santos, Manoel Galdino dos

; Silva, Thieres George Freire da

; Leite, Mauricio Luiz de Mello Vieira

; Barros Júnior, Aurélio Paes

; Bezerra Neto, Francisco

Acta Scientiarum. Agronomy

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2021, Volume 43 elocation e52045

Abstract: En | Text: En | PDF: En

ABSTRACT Producers in the northeastern semiarid region of Brazil have been cultivating irrigated corn. The commercialized product comprises mainly green ears and silage. However, the irrigation of crops for dry grain has been questioned regarding costs and price competitiveness in relation to the same non-irrigated product cultivated in other regions. In recent years, the use of drip tapes and fertigation has spread among corn producers in the region. The aim of this study was to determine the N dose, via fertigation, which provides the maximum economic production of corn for dry grain, in two crop seasons (summer and winter), in the semiarid region of Brazil. The experimental design was performed in randomized blocks, with four replications. In both crops, the treatments consisted of four doses of N (0, 80, 160, and 240 kg ha-1) applied in the form of urea. In the hybrid corn (Bt Feroz), the N content was evaluated in terms of leaves, grain yield, gross and net incomes, the rate of return, and the profitability index. Independent of the crop season, the yield of dry grain (5,441.03 kg ha-1) was highest when the corn was fertigated with a dose of 104.05 kg ha-1 N. The highest net incomes of the dry grain were obtained with 80 kg ha-1 N in summer (R$ 1,190.78 ha-1) and 160 kg ha-1 N in winter (R$ 2,757.54 ha-1). The winter crop was more favorable to the economic production of dry grain.

https://doi.org/10.4025/actasciagron.v43i1.52045

Métodos para avaliação da efetividade de vacinas para COVID-19 com ênfase em abordagens quase-experimentais
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Pescarini, Julia Moreira

; Teixeira, Camila Silveira Silva

; Cruz, Enny Paixão

; Ortelan, Naia

; Pinto, Priscila Fernanda Porto Scaff

; Ferreira, Andrêa Jacqueline Fortes

; Alves, Flavia Jôse Oliveira

; Pinto Junior, Elzo Pereira

; Falcão, Ila Rocha

; Rocha, Aline dos Santos

; Silva, Nivea Bispo da

; Ortiz, Renzo Flores

; Saavedra, Ramon da Costa

; Oliveira, Vinicius de Araújo

; Ribeiro-Silva, Rita de Cássia

; Ichihara, Maria Yury Travassos

; Boaventura, Viviane

; Barral Netto, Manoel

; Kerr, Ligia Regina Franco Sansigolo

; Werneck, Guilherme Loureiro

; Barreto, Mauricio L.

Ciência & Saúde Coletiva

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2021, Volume 26 N. 11 Pages 5599 - 5614

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

https://doi.org/10.1590/1413-812320212611.18622021

Medidas de distanciamento social no controle da pandemia de COVID-19: potenciais impactos e desafios no Brasil
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Aquino, Estela M. L.

; Silveira, Ismael Henrique

; Pescarini, Julia Moreira

; Aquino, Rosana

; Souza-Filho, Jaime Almeida de

; Rocha, Aline dos Santos

; Ferreira, Andrea

; Victor, Audêncio

; Teixeira, Camila

; Machado, Daiane Borges

; Paixão, Enny

; Alves, Flávia Jôse Oliveira

; Pilecco, Flávia

; Menezes, Greice

; Gabrielli, Ligia

; Leite, Luciana

; Almeida, Maria da Conceição Chagas de

; Ortelan, Naiá

; Fernandes, Qeren Hapuk R. Ferreira

; Ortiz, Renzo Joel Flores

; Palmeira, Raquel Nunes

; Pinto Junior, Elzo Pereira

; Aragão, Erika

; Souza, Luis Eugenio Portela Fernandes de

; Barral Netto, Manoel

; Teixeira, Maria Glória

; Barreto, Mauricio Lima

; Ichihara, Maria Yury

; Lima, Raíza Tourinho dos Reis Silva

Ciência & Saúde Coletiva

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jun 2020, Volume 25 Suppl. 1 Pages 2423 - 2446

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

Abstract The COVID-19 pandemic has challenged researchers and policy makers to identify public safety measures forpreventing the collapse of healthcare systems and reducingdeaths. This narrative review summarizes the available evidence on the impact of social distancing measures on the epidemic and discusses the implementation of these measures in Brazil. Articles on the effect of social distancing on COVID-19 were selected from the PubMed, medRXiv and bioRvix databases. Federal and state legislation was analyzed to summarize the strategies implemented in Brazil. Social distancing measures adopted by the population appear effective, particularly when implemented in conjunction with the isolation of cases and quarantining of contacts. Therefore, social distancing measures, and social protection policies to guarantee the sustainability of these measures, should be implemented. To control COVID-19 in Brazil, it is also crucial that epidemiological monitoring is strengthened at all three levels of the Brazilian National Health System (SUS). This includes evaluating and usingsupplementary indicators to monitor the progression of the pandemic and the effect of the control measures, increasing testing capacity, and making disaggregated notificationsand testing resultstransparentand broadly available.

Resumo A pandemia de COVID-19 tem desafiado pesquisadores e gestores a encontrar medidas de saúde pública que evitem o colapso dos sistemas de saúde e reduzam os óbitos. Esta revisão narrativa buscou sistematizar as evidências sobre o impacto das medidas de distanciamento social na epidemia de COVID-19 e discutir sua implementação no Brasil. Foram triados artigos sobre o efeito do distanciamento social na COVID-19 no PubMed, medRXiv e bioRvix, e analisados atos do poder público nos níveis federal e estadual para sumarizar as estratégias implementadas no Brasil. Os achados sugerem que o distanciamento social adotado por população é efetivo, especialmente quando combinado ao isolamento de casos e à quarentena dos contatos. Recomenda-se a implementação de medidas de distanciamento social e de políticas de proteção social para garantir a sustentabilidade dessas medidas. Para o controle da COVID-19 no Brasil, é imprescindível que essas medidas estejam aliadas ao fortalecimento do sistema de vigilância nos três níveis do SUS, que inclui a avaliação e uso de indicadores adicionais para monitorar a evolução da pandemia e o efeito das medidas de controle, a ampliação da capacidade de testagem, e divulgação ampla e transparente das notificações e de testagem desagregadas.

https://doi.org/10.1590/1413-81232020256.1.10502020

Upconversion 3D Printed Composite with Multifunctional Applications for Tissue Engineering and Photodynamic Therapy
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Nigoghossian, Karina

; Saska, Sybele

; Christovam, Livia M.

; Coelho, Fernanda

; Beatrice, Cesar Augusto G.

; Lucas, Alessandra A.

; Neto, Paulo I.

; Silva, Jorge Vicente L. da

; Tercjak, Agnieszka

; Baptista, Maurício S.

; Catalani, Luiz Henrique

; Scarel-Caminaga, Raquel M.

; Capote, Ticiana S. O.

; Ribeiro, Sidney José L.

Journal of the Brazilian Chemical Society

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apr 2020, Volume 31 N. 4 Pages 638 - 652

Abstract: En | Text: En | PDF: En

Upconversion nanoparticles (UCNPs) are suitable materials for bioapplications due to their ability to emit visible light under near infrared (NIR) excitation, in the biological transparency range. Polycaprolactone(PCL)-based scaffolds are widely used in tissue engineering in combination with inorganic compounds to improve bioactivity and osteoconductive properties. This work proposes a 3D printed composite scaffold with upconversion property aiming at biomedical applications in therapy-stimulated bone repair and photodynamic therapy (PDT). The system combines PCL polymer, UCNPs-apatite and a PDT photosensitizer. Thermal and rheological behaviors of the composite were similar to pure PCL polymer. Mechanical properties were improved by adding UCNPs-apatite. The 3D printable composite presented upconversion property and potential for PDT application, which was demonstrated by singlet oxygen generation under 980 nm excitation. Cytotoxicity, genotoxicity and mutagenicity assays indicated no toxicological effects at low concentrations of rare earth elements. Taken together, a potential multifunctional material is proposed for biomedical applications.

https://doi.org/10.21577/0103-5053.20190228

Spatial and temporal differences in the fish assemblage structure in a subtropical estuary
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Cattani, André P.

; Ribeiro, Gisela C.

; Hostim-Silva, Mauricio

; Soeth, Marcelo

; Clezar, Leandro

; Cardoso, Olímpio R.

; Pichler, Helen A.

; Spach, Henry L.

Latin american journal of aquatic research

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mar 2020, Volume 48 N. 1 Pages 74 - 84

Abstract: En | Text: En | PDF: En

ABSTRACT A large number of fish species use the mangrove mainly due to food availability and protection against predators. The knowledge of temporal and spatial dynamics of ichthyofauna allows us to identify patterns of occupation of this ecosystem and to support the assessment and preservation of local biodiversity. In this sense, samplings were conducted in 1988 at five areas of the Itacorubi River estuary, Santa Catarina Island. A total of 3,883 specimens were collected, distributed in 21 families and 41 species with the predominance of Cetengraulis edentulus, Mugil liza, Mugil curema, Genidens genidens, Mugil gaimardianus, Eucinostomus gula, Micropogonias furnieri, Pomatomus saltatrix and Sphoeroides testudineus. On average, abundances differed between seasons and sampled areas. Differences were detected between the fish faunas of fall and winter compared to summer and spring and between sampling sites. This study identified a fish assemblage in the mangrove of the Itacorubi River with a similar structure to other estuaries of southern Brazil.

https://doi.org/10.3856/vol48-issue1-fulltext-1927

10.

Mutual Coupling Reduction in Phased Array Antennas Applying High-Impedance Surface at X Band
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Araújo, José Bruno O. de

; Souza, Vanessa P. R. Magri

; Ferreira, Tadeu N.

; Matos, Leni J. de

; Siqueira, Glaucio L.

; Souza, Jorge M.

; Silva, Maurício W. B. da

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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mar 2020, Volume 19 N. 1 Pages 118 - 128

Abstract: En | Text: En | PDF: En

Abstract This paper presents a microstrip phased array using High Impedance Surface - Electromagnetic Bandgap (HIS-EBG) in order to minimize the effects of mutual coupling among the antenna elements. Each element of the array is fed by a coaxial cable allowing the beam steering by controlling the signal of the input port of each element. This phased array operates at X Band as well as the bandgap of the HIS-EBG structure. Its main applications are satellite communication and broadcasting systems. Results show reductions in the mutual coupling up to 12 dB, and improvements in the return loss and gain.

https://doi.org/10.1590/2179-10742020v19i11773

11.

Productive potential and castor bean selection of the FCA-PB cultivar progenies
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Silva, Jackson da

; Ramos, Andréia Rodrigues

; Amorim, Deoclécio Jardim

; Zanotto, Mauricio Dutra

; Sartori, Maria Márcia Pereira

Revista Ceres

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feb 2020, Volume 67 N. 1 Pages 42 - 51

Abstract: En | Text: En | PDF: En

ABSTRACT Castor bean is a very important crop, however, in Brazil it still has relatively low productivity, 0.47 Mg ha-1 as a mean. Besides that the Country has significant castor oil demand and depends on international commerce to complement its production. The solution of these problems goes through the development of genotypes highly productive and adapted to the producing regions. So, the objective of this research was to evaluate the productive potential and selection of castor progenies of the cultivar FCA-PB, resulting from three types of pollination, in two crops and in two localities of the State of São Paulo. Grain productivity was evaluated, and some genetic parameters were estimated. In relation to the 2005/2006 crop, the progeny 49 cultivated in the locality of São Manuel produced 4170.66 kg ha-1 of grains. The highest heritability coefficients were observed in the 2005/2006 crop in the locality of Araçatuba. Progenies 1, 5, 6, 8, 15, 18, 19, 21, 27, 31, 35, 36, 38, 45, 49, 55, 56 and 58 were selected. Genotype interaction with the location indicated productive materials and adapted to the state of São Paulo.

https://doi.org/10.1590/0034-737x202067010007

12.

Phytase and xylanase in diets with nutritional adjustments and their effects on serum biochemistry, morphometry and intestinal health of broilers
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CHAVES, NATÁLIA R.B.

; NASCIMENTO, KARINA M.R.S.

; KIEFER, CHARLES

; ROSA, MAURÍCIO S.

; FEITAS, HENRIQUE B.

; PAIVA, LUANNA L.

; SILVA, THIAGO R.

; SILVA, LARISSA A.R.

; MACIE, VIOLETA A.

; LEAL, CÁSSIA R.B.

; SOUZA, ALDA I.

; ZANOELO, FABIANA F.

Anais da Academia Brasileira de Ciências

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2020, Volume 92 elocation e20190278

Abstract: En | Text: En | PDF: En

Abstract To examine the association between phytase and xylanase in diets with nutritional adjustments on intestinal morphometry, serum biochemistry and microbiology of broilers, 250 broilers were evaluated in a completely randomized design with five treatments and five replicates. The following treatments were tested: positive control diet - without phytase or xylanase; negative control diet - with an energy reduction of 100 kcal/kg, without phytase or xylanase; and three diets containing xylanase and phytase and energy reductions of 50, 100 and 150 Kcal/kg. For all energy-reduced diets, the nutritional matrix of phytase with phosphorus (0.15%), calcium (0.165%) and sodium (0.035%) was considered. An effect of the association between enzyme inclusion and metabolizable energy reduction in the diets was observed only by contrast analysis, for villus height. Intestinal health was not changed. Only the serum phosphorus concentration was altered by the treatments at the different evaluated ages. The association of phytase (500 FTU/kg) with xylanase (16000 BXU/kg) in diets with reductions of up to 150 Kcal/kg metabolizable energy, 0.15% digestible P, 0.165% Ca and 0.035% Na does not alter the intestinal morphometry, serum biochemistry or microbiology of broilers.

https://doi.org/10.1590/0001-3765202020190278

13.

Type of shelter and first description of the echolocation call of disk-winged bat (Thyroptera devivoi)
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Rosa, Renato O. L.

; Silva, Claysson H. A.

; Oliveira, Thiago F.

; Silveira, Mauricio

; Aguiar, Ludmilla M. S.

Biota Neotropica

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2020, Volume 20 N. 2 elocation e20190821

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

Abstract: Thyropteridae is a family of bats endemic to the Neotropical region, and Thyroptera devivoi is the only species in the family that occurs exclusively in forest patches within savannas of northern South America and north of the Brazilian Cerrado. Primary data on the species are still scarce. Therefore, in this study our objective was to fill knowledge gaps on geographical distribution, roost-use, and echolocation for the species. We observed a T. devivoi colony of 15 individuals living under a dead palm leaf. The bats used the leaf as a roost for at least four days. After capturing one individual, we confirmed the species identification via skull size and the oblong shape of the adhesive disk. The new record reinforces the association of this species with non-forested formations, and its occurrence mainly in savannas. Echolocation calls of T. devivoi are consistent with those known for the genus, with multiharmonic, low intensity and high frequency pulses. Despite these new data, more studies are certainly needed to enhance distribution data for the species, as well as to clarify the biological and ecological requirements of the species.

Resumo: Thyropteridae é uma família de morcegos endêmica da região Neotropical e Thyroptera devivoi é a única espécie da família que ocorre exclusivamente em manchas florestais das savanas do norte de América do Sul e do Cerrado Brasileiro. Dados primários da espécie são ainda escassos e o objetivo deste estudo foi preencher lacunas de conhecimento sobre distribuição geográfica, uso de abrigos e padrões de ecolocalização da espécie. Nós observamos uma colônia de T. devivoi com 15 indivíduos vivendo sob uma folha morta de palmeira. Os morcegos usaram a folha como abrigo ao menos por quatro dias. Depois de capturar um indivíduo, nós confirmamos a identificação da espécie por meio da morfologia do crânio e do disco adesivo. O novo registro reforça a associação da espécie com formações não florestais e a ocorrência principalmente em savanas. Os chamados de ecolocalização de T. devivoi são consistentes com o conhecido para o gênero, com pulsos multi-harmônicos de baixa intensidade e alta frequência. A despeito destes novos dados, mais estudos são certamente necessários para aprimorar os dados de distribuição assim como os requerimentos biológicos da espécie.

https://doi.org/10.1590/1676-0611-bn-2019-0821

14.

Medidas de distanciamento social no controle da pandemia de COVID-19: potenciais impactos e desafios no Brasil
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Aquino, Estela M. L.

; Silveira, Ismael Henrique

; Pescarini, Julia Moreira

; Aquino, Rosana

; Souza-Filho, Jaime Almeida de

; Rocha, Aline dos Santos

; Ferreira, Andrea

; Victor, Audêncio

; Teixeira, Camila

; Machado, Daiane Borges

; Paixão, Enny

; Alves, Flávia Jôse Oliveira

; Pilecco, Flávia

; Menezes, Greice

; Gabrielli, Ligia

; Leite, Luciana

; Almeida, Maria da Conceição Chagas de

; Ortelan, Naiá

; Fernandes, Qeren Hapuk R. Ferreira

; Ortiz, Renzo Joel Flores

; Palmeira, Raquel Nunes

; Pinto Junior, Elzo Pereira

; Aragão, Erika

; Souza, Luis Eugenio Portela Fernandes de

; Barral Netto, Manoel

; Teixeira, Maria Glória

; Barreto, Mauricio Lima

; Ichihara, Maria Yury

; Lima, Raíza Tourinho dos Reis Silva

Ciência & Saúde Coletiva

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2020, Volume 25 Suppl. 1 Pages 2423 - 2446

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

https://doi.org/10.1590/1413-81232020256.1.10502020

15.

Channel Characteristics for Fixed and Portable DTV Reception in a Single Frequency Network
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Guerra, Maurício V.

; Filho, Jair L. de A.

; Ron, Carlos V. Rodriguez

; Mello, Luiz A. R. da Silva

; Castellanos, Pedro V. G.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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jul 2019, Volume 18 N. 3 Pages 439 - 451

Abstract: En | Text: En | PDF: En

Abstract This paper presents the propagation channel characteristics of a digital TV single-frequency network (SFN) obtained by carrying out field measurements using two synchronized transmitters. The measurements are performed at 31 reception points using both a directive reception antenna, which is typical of fixed reception scenarios, and an omnidirectional antenna, which is used to receive mobile signals. The characteristic parameters of the channel are obtained, including the average delay, the root mean square (RMS) delay spread, and the Rician K-factor, which are important for the design of SFN systems. An empirical expression is obtained for the prediction of the RMS delay spread as a function of the K factor and the distances to the transmission antennas.

https://doi.org/10.1590/2179-10742019v18i31778

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