Conasat-0: Visão Geral Do Nanossatélite Desenvolvido

Alves, Alex C. R.; Dias, Samaherni; Queiroz, Kurios; Carvalho, Manoel J. M.; Duarte, José Marcelo Lima

doi:10.29327/2cab2019.224823

Cited by 3 publications

(2 citation statements)

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“…Both D2 and D3 can also come from the diet. In the metabolism, the substance subsequently undergoes hydroxylation in the liver by 25-hydroxylase and becomes 25-hydroxyvitamin D. This process requires additional hydroxylation in the kidney by 1 alpha-hydroxylase to then form the biologically active form of vitamin D 1,25-dihydroxyvitamin D. 11 According to Nolan and colleagues, 12 vitamin D (25-hydroxyvitamin D) deficiency has emerged as a public health issue in recent years due to its contribution to skeletal and extra-skeletal manifestations. Individuals with sickle cell disease reportedly tend to present a high prevalence of vitamin D deficiency.…”

Section: Vitamin Dmentioning

confidence: 99%

Prevalence of vitamin D deficiency in children with sickle cell anemia: a systematic review

Isabela G. Bristotte,

Natália V. S. Daniel,

Luciana Pietro

2023

BJHBS

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Introduction: Sickle cell anemia is a highly prevalent genetic disease in the Brazilian population, mainly present in black ethnic groups from slave migration, as well as from the miscegenation process. It is a disease of clinical expression of the homozygosity of the hemoglobin S gene, which may be a genetic and/or hereditary disease, caused by the replacement of the normal residue of glutamic acid by the amino acid valine in the sixth position of the polypeptide chains of the beta-globin protein, generating biochemical alteration in the hemoglobin S molecules, which polymerize inside the erythrocyte and transform into a sickle cell. The possible lack of vitamin D may be linked to disease processes, as well as to the individual's painful crises. Objectives: To analyze whether or not there was a prevalence of vitamin D deficiency in children with sickle cell anemia, through a systematic review. Methodology: A systematic review was carried out by searching for original articles in the scientific databases: Pubmed, Science Direct, Lilacs and Scielo in the languages: English and Portuguese. Results: It was found that out of 10 articles, 8 showed the prevalence of vitamin D deficiency (< 20 ng/ml) in children with sickle cell anemia. Conclusion: The prevalence of vitamin D deficiency was high in patients with the disease, so that its supplementation may serve as a means of assisting in the treatment to improve the condition and prevent deficiency. However, more targeted studies with this association and/or intervention are needed to have more concrete results.

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Section: Vitamin Dmentioning

confidence: 99%

Prevalence of vitamin D deficiency in children with sickle cell anemia: a systematic review

Isabela G. Bristotte,

Natália V. S. Daniel,

Luciana Pietro

2023

BJHBS

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“…Em [4], apresentaram-se as especificações de dimensionamento físico, carga útil, subsistemas de energia e de armazenamento e processamento eletrônico de dados, de um nanossatélite 1U em desenvolvimento, denominado CONASAT-0. Sua estrutura é de baixo custo e reduzidas dimensões físicas.…”

Section: Introductionunclassified

Projeto de um Transceptor para Integração em Nanossatélites

Pereira¹,

Fumagalli²,

Pereira³

et al. 2021

Anais Do XXXIX Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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Resumo-Este artigo apresenta o desenvolvimento e validação experimental de uma topologia de transceptor para integração em nanossatélites com dois canais de comunicação: enlace de subida em 401 MHz e enlace de descida em 2,26 GHz. Analisase, inicialmente, o cenário no qual o sistema completo (nanossátelite com transceptor embarcado) deverá operar. Na sequência, analisam-se os componentes (amplificadores, filtros e mixer) a serem empregados no projeto. Por fim, o protótipo construído e caracterizado experimentalmente é apresentado e discutido.

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A multiuser decoder based on spectrum analysis for the Brazilian Environmental Data Collecting System

Duarte

Lima

Ramos

et al. 2020

Satell Commun Network

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Summary The Brazilian Environmental Data Collection System (SBCDA) is an asynchronous multiuser message forwarding system based on low earth orbit (LEO) satellites with applications restricted to environmental monitoring and human life protection. This work presents a multiuser SBCDA decoder with low data memory and computational load. The decoder uses spectrum analysis to detect signal presences and upon every signal detection starts a signal decoding process with single‐user bit detection. Simulations considering an Additive White Gaussian Noise (AWGN) scenario with signal's time‐frequency positions uniformly and independently distributed and signal's powers uniformly distributed in dB within a dynamic range of 24 dB are present for different densities of user signals. Those show a frame error rate (FER) of approximately 25% for an average of six coexisting signals at every time instant, in which a missed signal was considered as a frame error. Finally, there are considerations on how to improve the performance maintaining a single‐input and single‐user bit detection strategy.

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Conasat-0: Visão Geral Do Nanossatélite Desenvolvido

Cited by 3 publications

References 0 publications

Prevalence of vitamin D deficiency in children with sickle cell anemia: a systematic review

Prevalence of vitamin D deficiency in children with sickle cell anemia: a systematic review

Projeto de um Transceptor para Integração em Nanossatélites

A multiuser decoder based on spectrum analysis for the Brazilian Environmental Data Collecting System

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