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Abstract In this work, measuring capabilities of a Sagnac Interferometer-based Distributed Optical Fiber Sensor (DOFS) system are demonstrated by comparing its results to a conventional amplitude-based Distributed Acoustic Sensing (DAS) system. Through a set of three different experiments, it was demonstrated that both sensing systems can detect and locate dynamical deformation along the fiber, in addition to determining its frequency components. The coherent amplitude-based DAS presented a lower background noise. In contrast, even though the Sagnac interferometry-based system presented low-frequency noise in the measurements, it is less susceptible to harmonic distortion for higher amplitude deformations since its sensing principles rely on the measurement of the accumulated phase rather than the amplitude of the backscattered signal purely. Accordingly, the Sagnac interferometry-based system arises as a promising and rather accessible topology for a DOFS implementation. work Interferometerbased Interferometer based (DOFS amplitudebased (DAS experiments fiber components contrast interferometrybased interferometry lowfrequency low measurements purely Accordingly implementation

https://doi.org/10.1590/2179-10742023v22i1265391

How many species of Mollusca are there in Brazil? A collective taxonomic effort to reveal this still unknown diversity
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Machado, Fabrizio M.

; Miranda, Marcel S.

; Salvador, Rodrigo B.

; Pimenta, Alexandre D.

; Côrtes, Mariana O.

; Gomes, Jaime A.J.

; Miyahira, Igor C.

; Agudo-Padrón, Ignacio

; Oliveira, Cléo D.C.

; Caetano, Carlos H.S.

; Coelho, Paulo R.S.

; D’Ávila, Sthefane

; Arruda, Eliane P. de

; Almeida, Sérgio M. de

; Gomes, Suzete R.

; Alvim, Juliana

; Galvão-Filho, Hilton

; L. Ferreira-Júnior, Augusto

; Marques, Rodrigo C.

; Martins, Inês

; Souza, Leonardo S. de

; Arruda, Janine O.

; Cavallari, Daniel C.

; Santos, Sonia B. dos

; Pedro, Natan C.

; Salles, Anna C. de A.

; Dornellas, Ana P.S.

; Lima, Tarcilla C. de

; Amaral, Vanessa S. do

; Silva, Fernanda S.

; Passos, Flávio D.

; Thiengo, Silvana S.

; Leite, Tatiana S.

; Simone, Luiz R.L.

Zoologia (Curitiba)

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2023, Volume 40 elocation e23026

Abstract: En | Text: En | PDF: En

ABSTRACT The expression ‘you need to know to conserve’ is a well-known cliche among biologists. Documenting the richness of a group of organisms is the first step towards understanding biodiversity and preparing efficient conservation plans. In this context, many efforts have been made to quantify the number of species on Earth and estimate the number of species still unknown to science. A few countries have complete and integrated databases estimating the approximate number of species recorded for their territory, particularly in the Global South. In Brazil, a country of continental dimensions, revealing the richness of the second most diverse clade of invertebrates (=Mollusca) has been a goal of taxonomists. Recently, in an unprecedented, collective, and integrated effort among Brazilian malacologists, it was possible to estimate how many valid species of molluscs are there in Brazil. In this effort, more than 30 mollusc experts joined together to update the Taxonomic Catalogue of the Brazilian Fauna (TCBF), a governmental website that allows a quick and real-time updating of all Metazoan. So far, more than 5,000 updates have been made in TCBF, indicating the presence of 3,552 valid species of molluscs in Brazil, distributed among the main clades as follows: Caudofoveata (10 spp.), Solenogastres (6 spp.), Polyplacophora (35 spp.), Scaphopoda (43 spp.), Cephalopoda (92 spp.), Bivalvia (629 spp.) and Gastropoda (2,737 spp.). The present study, in addition to demonstrating for the first time the richness of Brazilian molluscs, also presents the state of the art of this important phylum of invertebrates highlighting its most representative and neglected groups.

https://doi.org/10.1590/s1984-4689.v40.e23026

Improved Multiobjective Optimization for Cellular Base Stations Positioning
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Lopes, Ramz L. Fraiha

; Gomes, Igor R.

; Gomes, Cristiane R.

; Gomes, Herminio S.

; Cavalcante, Gervásio P. S.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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dec 2021, Volume 20 N. 4 Pages 870 - 882

Abstract: En | Text: En | PDF: En

Abstract This work presents improvements to a telecommunication service planning tool for optimal positioning of base stations presented in a previous work. The tool uses a propagation loss model based on the K-Nearest Neighborhoods classifier since its conception. The original objective of this tool is to optimize the positioning of transmitting towers in the frequencies of 2.1 GHz and 2.6 GHz in a given environment, maximizing the coverage area. The improvement proposed in this article includes the optimization of the positioning of the towers in order to meet the maximum coverage, prioritizing the locations considered most important. The studied scenario is the campus of the Federal University of Pará, with characteristics similar to some cities in the Amazon region. The analysis of the results was made by comparing the power data received from the measurement campaigns with the coverage estimates obtained with the improved tool. The improved methodology showed better results than those from the previous study, both in the positioning of the antennas and in the time spent. We obtained a reduction of up to 72% in the time to calculate the optimal solution compared to the original study.

https://doi.org/10.1590/2179-0742021v20i41309

Optimum Positioning of Base Station for Cellular Service Devices Using Discrete Knowledge Model
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Gomes, Cristiane R.

; Gomes, Igor R.

; Lopes, Ramz L. Fraiha

; Gomes, Herminio S.

; Cavalcante, Gervásio P. S.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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dec 2020, Volume 19 N. 4 Pages 428 - 443

Abstract: En | Text: En | PDF: En

Abstract A good wireless network design depends on technical and financial viability and a number of other criteria that must be met. Following the emergence of new technologies and services, such as 5G transmission and the reuse of frequencies, new work is being carried out to ensure a better design for a particular area. This study examines a discrete radio propagation model which employs the K nearest neighbors classifier. The model takes into account the different characteristics of the environment. This article presents a case study for the optimum positioning of base stations in Federal University of Pará (Belém – Brazil), representing a typical Amazon environment. The mentioned scenario is heterogeneous, presenting edifications and considerable forest area. Measurement campaigns were conducted in three different frequencies for the design features of the model: 521 MHz (Brazilian digital TV system), 2100 MHz (Enhanced Data Rates for GSM Evolution), and 2600 MHz (Long Term Evolution). A study of the fading phenomenon in these frequencies was carried out to generalize the frequencies of application for the propagation loss model. When this model was ready, tests (computing simulations) were conducted in two scenarios to optimize the positioning of the radio base stations being studied.

https://doi.org/10.1590/2179-10742020v19i4941 444 downloads

Diagnostic Characteristics of Serological-Based COVID-19 Testing: A Systematic Review and Meta-Analysis
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Moura, Diogo Turiani Hourneaux de

; McCarty, Thomas R.

; Ribeiro, Igor Braga

; Funari, Mateus Pereira

; Oliveira, Pedro Victor Aniz Gomes de

; Miranda Neto, Antonio Afonso de

; Monte Júnior, Epifânio Silvino do

; Tustumi, Francisco

; Bernardo, Wanderley Marques

; Moura, Eduardo Guimarães Hourneaux de

; Thompson, Christopher C.

Clinics

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2020, Volume 75 elocation e2212

Abstract: En | Text: En | PDF: En

Serologic testing for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) promises to assist in assessing exposure to and confirming the diagnosis of coronavirus disease 2019 (COVID-19), and to provide a roadmap for reopening countries worldwide. Considering this, a proper understanding of serologic-based diagnostic testing characteristics is critical. The aim of this study was to perform a structured systematic review and meta-analysis to evaluate the diagnostic characteristics of serological-based COVID-19 testing. Electronic searches were performed using Medline (PubMed), EMBASE, and Cochrane Library. Full-text observational studies that reported IgG or IgM diagnostic yield and used nucleic acid amplification tests (NAATs) of respiratory tract specimens, as a the reference standard in English language were included. A bivariate model was used to compute pooled sensitivity, specificity, positive/negative likelihood ratio (LR), diagnostic odds ratio (OR), and summary receiver operating characteristic curve (SROC) with corresponding 95% confidence intervals (CIs). Five studies (n=1,166 individual tests) met inclusion criteria. The pooled sensitivity, specificity, and diagnostic accuracy for IgG was 81% [(95% CI, 61-92);I2=95.28], 97% [(95% CI, 78-100);I2=97.80], and 93% (95% CI, 91-95), respectively. The sensitivity, specificity, and accuracy for IgM antibodies was 80% [(95% CI, 57-92);I2=94.63], 96% [(95% CI, 81-99);I2=92.96] and 95% (95% CI, 92-96). This meta-analysis demonstrates suboptimal sensitivity and specificity of serologic-based diagnostic testing for SARS-CoV-2 and suggests that antibody testing alone, in its current form, is unlikely to be an adequate solution to the difficulties posed by COVID-19 and in guiding future policy decisions regarding social distancing and reopening of the economy worldwide.

https://doi.org/10.6061/clinics/2020/e2212 1977 downloads

Occurrence of Ehrlichia canis and Hepatozoon canis and probable exposure to Rickettsia amblyommatis in dogs and cats in Natal, RN
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Lopes, Marcos Gomes

; Krawczak, Felipe da Silva

; Lima, Julia Teresa Ribeiro de

; Fournier, Gislene Fatima da Silva Rocha

; Acosta, Igor da Cunha Lima

; Ramirez, Diego Garcia

; Marcili, Arlei

; Labruna, Marcelo Bahia

; Gennari, Solange Maria

Revista Brasileira de Parasitologia Veterinária

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mar 2019, Volume 28 N. 1 Pages 151 - 156

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

Resumo A ocorrência de infecção ou exposição para Ehrlichia canis, Hepatozoon canis e Rickettsia spp. foi determinada em gatos ferais que viviam em dois fragmentos da Mata Atlântica, localizados em Natal, RN, Brasil e em cães que viviam em torno dos parques e em outras regiões da cidade. Enquanto amostras de soro foram coletadas de 155 animais (53 gatos que viviam nos parques, 29 cães com domicilio em torno dos parques e 73 cães do Centro de Controle de Animais -CCA), fragmentos de baço foram coletados de 20 cães eutanasiados no CCA. A detecção de anticorpos nas amostras de soros coletadas contra Rickettsia spp. e E. canis foi realizada pela Reação de Imunofluorescência Indireta. Dezessete dos 102 cães (17%) apresentaram anticorpos anti E. canis e 13% (20/155) de todos os cães e gatos (ou seja, 3% (3/102) dos cães e 32% (17/53) dos gatos) foram soropositivos para antígenos de Rickettsia spp. Os animais foram considerados expostos à R. amblyommatis ou a um genótipo muito relacionado. Entre as 20 amostras de baço de cães analisadas, oito foram positivas para E. canis e duas para Hepatozoon canis (números de acesso ao Genbank MG772657 e MG772658, respectivamente). Nenhuma das amostras de baço produziram amplicons de Babesia spp. na PCR. Observou-se, pela primeira vez, a circulação de Rickettsia do grupo da febre maculosa em cães e gatos em Natal, RN.

Abstract Occurrence of infection or exposure to Ehrlichia canis, Hepatozoon canis and Rickettsia spp. was detected in feral cats living in two fragments from Atlantic rainforest, in Natal, RN, Brazil, and in dogs living around the parks. While serum samples were collected from 155 animals (53 cats living in the parks; 29 dogs living in human homes around the parks; and 73 dogs living at an animal control center - ACC), spleen samples were collected from 20 dogs that were euthanized at ACC. Serum samples were analyzed to Rickettsia spp. and E. canis antibodies using the indirect immunofluorescence assay. Seventeen of the 102 dogs (17%) had E. canis antibodies and 13% (20/155) of all dogs and cats (i.e. 3% (3/102) of the dogs and 32% (17/53) of the cats) were seropositive for Rickettsia spp. antigens. The animals were therefore been exposed to R. amblyommatis or by a very closely related genotype. Among the 20 dog spleen samples analyzed, eight were PCR positive for E. canis and two for H. canis (GenBank accession number MG772657 and MG772658, respectively). In none of the spleen samples were obtained amplicons for Babesia spp. through PCR. This study provided the first evidence that Rickettsia of the spotted fever group is circulating among dogs and cats in Natal.

https://doi.org/10.1590/s1984-296120180065 1346 downloads

POTENCIAL EXPOSIÇÃO AO MERCÚRIO ATMOSFÉRICO NO AMBIENTE OCUPACIONAL DE COMÉRCIOS DE OURO DE PORTO VELHO, RONDÔNIA
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Lauthartte, Leidiane C.

; Gomes, Diego F.

; Mussy, Marília H.

; Holanda, Ígor B. B. de

; Almeida, Ronaldo

; Bastos, Wanderley R.

Química Nova

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sep 2018, Volume 41 N. 9 Pages 1055 - 1060

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

The gold mining in the Madeira River basin is performed by dredges and ferries that extract from the bottom of the river alluvial gold which is amalgamated with mercury (Hg). Throughout the process of gold purification, the Hg can be recovered by retort or crucible distillation. Subsequently, the gold is taken to the city of Porto Velho for commercialization, once more being smelted with blowtorch for jewelry making. This study aims to evaluate the Hg concentration exposed in the atmosphere of gold shops via an atomic absorption spectrophotometer coupled to portable cold steam generation (LUMEX) and to determine the occupational exposure through the analysis of urine samples of gold shops workers. Eleven gold shops and twenty workers were investigated. Some risky situations which may accompany the health of employees, such as poor ventilation, lack of exhaust systems and unhealthy places, have been verified in loco. The results showed atmospheric concentrations of Hg above the limits established by WHO, which is at most 200 ng m-3 in four gold shops. All examined presented total Hg results in the urine below the occupational limit of (50.00 μg L-1).

https://doi.org/10.21577/0100-4042.20170253 820 downloads

Stratigraphic Relations of the Ipubi Formation: Siliciclastic-Evaporitic Succession of the Araripe Basin
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FABIN, CARLOS E.

; CORREIA FILHO, OSVALDO J.

; ALENCAR, MÁRCIO L.

; BARBOSA, JOSÉ A.

; MIRANDA, TIAGO S. DE

; NEUMANN, VIRGÍNIO H.

; GOMES, IGOR F.

; SANTANA, FELIPE R. DE

Anais da Academia Brasileira de Ciências

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aug 2018, Volume 90 N. 2 Pages 2049 - 2071

Abstract: En | Text: En | PDF: En

ABSTRACT The Ipubi Formation represents the Aptian-Albian siliciclastic-evaporitic succession of Araripe Basin, NE Brazil. This succession comprises siliciclastic rocks (bituminous shales and claystones) and evaporites (gypsum and secondary anhydrite) and represents part of the lacustrine-shallow marine post-rift phase I. This study used sequence stratigraphy concepts to define the relations between changes in the relative lake level and the formation of Ipubi deposits. Results show that the organic-rich shales of the Ipubi Formation formed during a transgressive pulse that covered large areas of the proximal domains. These deposits overlie a regional unconformity that marks the end of the deposition of the underlying Crato Formation. A High Stand stage that followed the transgression influenced the formation of evaporitic deposits. Climate conditions played a major role in influencing the triggering and stopping of evaporite deposition. Thus, a new relative lake level fall event caused the exposure of the Ipubi Formation deposits, and created another regional subaerial unconformity accompanied by widespread karstification of evaporite beds. A posterior transgression caused the deposition of siliciclastic rocks of the Romualdo Formation over the Ipubi Formation strata, and also promoted a new event of karstification of the Ipubi upper evaporite beds.

https://doi.org/10.1590/0001-3765201820170526 1725 downloads

Relationship between resting heart rate and anthropometric, metabolic and hemodynamic parameters in the elderly aged 80 years and over
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Rossi, Fabrício E.

; Ricci-Vitor, Ana Laura

; Gomes, Igor C.

; Santos, Vanessa R.

; Sabino, João Paulo J.

; Branco, Luiz Guilherme S.

; Christofaro, Diego G. D.

; Vanderlei, Luiz Carlos M.

; Freitas Junior, Ismael F.

Motriz: Revista de Educação Física

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mar 2016, Volume 22 N. 1 Pages 18 - 26

Abstract: En | Text: En | PDF: En

Abstract This study examined the relationship between resting heart rate (RHRr) and anthropometric, metabolic and hemodynamic parameters in subjects aged 80 years and over. One hundred thirteen individuals were divided into two groups (RHR:<66 beats/min and ≥66 beats/min). Anthropometric parameters (weight, height, body mass index and waist circumference (WC) were measured. Hemodynamic parameters (systolic (SBP) and diastolic (DBP) pressure) were measured and pulse pressures (PP) were obtained. Metabolic parameters were fasting blood glucose, triglycerides and total cholesterol. In elderly aged 80 and over, RHR influenced the changes observed in DBP, PP and triglycerides. Additionally, subjects with RHR≥66 beats/min had higher DBP, glucose, total cholesterol and lower PP as compared with elderly with RHR<66 beats/min. Men demonstrated greater weight, height, and WC than women while women had higher percentage of body fat, trunk fat, and higher total cholesterol. Thus, subjects with 80 years old and over who present RHR≥66 have higher DBP and lower PP and heart rate variability compared with the elderly with RHR<66.

https://doi.org/10.1590/S1980-65742016000100003 1518 downloads

10.

Cirurgia plástica pós-gastroplastia: perfil das deficiências nutricionais com implicações na cicatrização
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LUNA, IGOR CHAVES GOMES

; CAVALCANTI, ERNANDO LUIS FERRAZ

; SALGADO, IVO VIEIRA

; MELO, DAVID SILVEIRA FARIAS DE

; ALMEIDA, ANA LUIZA MELO C. DE

; PEREIRA, RUI MANOEL R.

Revista Brasileira de Cirurgia Plástica

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2014, Volume 29 N. 4 Pages 557 - 561

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

ABSTRACT Introduction: Plastic surgeons have received in their outpatient clinics an increasing number of patients complaining of body contour defects due to the massive weight loss after a bariatric surgery. However, owing to dietary restrictions and surgical desorption, metabolic complications and nutritional disorders are commonly observed in the late postoperative period after gastroplasty. The aim of this study was to determine the prevalence of major nutritional disorders related to healing in patients at a specialized outpatient plastic surgery clinic who underwent gastroplasty. Method: This is an observational, transversal, and descriptive study, in which a laboratory protocol was used to clinically evaluate and assess the patients. Results: Thirty-two patients who underwent gastroplasty at least 2 years previously with weight stability for at least 6 months were evaluated. The major disorders identified included anemia (56% of patients) and deficiency in iron (31.2%), vitamin B12 (25%), zinc ions (18.7%), and copper (3.1%). Mild deficiencies in the protein profile were also observed; however, no deficiencies in basic and lipid biochemistry were noted. Conclusion: The plastic surgeon should have an in-depth knowledge about the prevalence of the major nutritional disorders related to healing in postbariatric patients, to allow correction of possible deficiencies and prevention of complications. However, more studies would be required to correlate any dietary deficiency to the complications observed in the postoperative period in this group of patients.

RESUMO Introdução: Os cirurgiões plásticos têm recebido em seus consultórios e ambulatórios um número cada vez maior de pacientes com queixa de deformidade do contorno corporal após maciças perdas ponderais secundárias a cirurgias bariátricas. Todavia, em função das restrições alimentares e disabsorções cirúrgicas, são frequentes complicações metabólicas e distúrbios nutricionais no pós-operatório tardio das gastroplastias. O objetivo deste estudo é detectar a prevalência dos principais distúrbios nutricionais relacionados à cicatrização em pacientes de ambulatório especializado em cirurgia plástica do paciente pós-gastroplastia. Método: é um estudo observacional, transversal e descritivo, em que os pacientes foram avaliados clinicamente e através de protocolo laboratorial. Resultados: foram avaliados 32 pacientes com gastroplastia há pelo menos dois anos e estabilidade ponderal há no mínimo seis meses. Os principais distúrbios detectados foram: anemia (56% dos pacientes), com carências na bioquímica do ferro (31,2%) e da vitamina B12 (25%), bem como deficiências dos íons zinco (18,7%) e cobre (3,1%). Houve carências discretas no perfil proteico e ausência de déficits na bioquímica básica e lipidograma. Conclusão: é dever do cirurgião plástico conhecer a fundo a prevalência dos principais distúrbios nutricionais relacionados à cicatrização na população de pacientes pós-gastroplastia no sentido de corrigir eventuais carências e prevenir complicações. Sabe-se, contudo, que ainda são necessários mais estudos para correlacionar qualquer deficiência alimentar às intercorrências observadas no pós-operatório deste grupo de pacientes.

https://doi.org/10.5935/2177-1235.2014rbcp0097

11.

Hanseníase em menores de 15 anos: a importância do exame de contato
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Pires, Carla Andrea A.

; Malcher, Cláudia Marques S. R.

; Abreu Júnior, José Maria C.

; Albuquerque, Tamires Gomes de

; Corrêa, Igor Ricardo S.

; Daxbacher, Egon Luiz R.

Revista Paulista de Pediatria

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jun 2012, Volume 30 N. 2 Pages 292 - 295

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

OBJETIVO: Descrever dois casos de hanseníase em menores de 15 anos, sendo um de paciente com 18 meses de idade e outro de 13 anos, diagnosticados por modos de detecção diferentes, ressaltando a importância de examinar os contatos. DESCRIÇÃO DO CASO: Um dos casos foi diagnosticado precocemente por meio do exame de contatos intradomiciliares, enquanto o outro foi diagnosticado por demanda espontânea após quatro anos de aparecimento das lesões e, apesar de ser contato de um ex-paciente, não foi examinado na época. COMENTÁRIOS: Em países endêmicos, a alta detecção da hanseníase em menores de 15 anos revela a persistência na transmissão do bacilo e as dificuldades dos programas de saúde para o controle da doença. O maior tempo para diagnóstico ocasiona sequelas e deformidades e, dessa forma, a busca dos contatos constitui importante método para o diagnóstico precoce da doença na infância, quando os sinais clínicos nem sempre são fáceis de serem identificados e há grande diversidade de formas clínicas em que a doença pode se apresentar.

OBJECTIVE: To describe two cases of leprosy in children under 15 years old, being one patient aged with 18 months and other 13 years, diagnosed by different modes of detection, emphasizing the importance of examining the contacts. CASE DESCRIPTION: One of the cases was diagnosed early by examining household contacts, while the other was diagnosed by spontaneous demand, after four years of the onset of lesions, although he had been a former patient contact who was not examined at the time. COMMENTS: In endemic countries, the high detection of leprosy in children under 15 years old reveals the persistence of the bacillus transmission and the difficulties encountered by public health programs to control the disease. Delay in leprosy diagnosis leads to sequels and deformities and, thus, the search for contacts is important as an effective method for early diagnosis of the disease in childhood, where clinical signs are not always easy to be identified due to the great variety of clinical forms in which the disease may occur.

OBJETIVO: Describir dos casos de enfermedad de Hansen en menores de 15 años, siendo uno de paciente con 18 meses de edad y otro de 13 años, diagnosticados por modos de detección distintos, subrayando la importancia de examinar a los contactos. DESCRIPCIÓN DEL CASO: Uno de los casos tuvo diagnóstico temprano mediante examen de contactos intradomiciliares, mientras que el otro fue diagnosticado por demanda espontánea después de cuatro años de surgimiento de las lesiones y, a pesar de ser contacto de un ex-paciente, no fue examinado en la época. COMENTARIOS: En países endémicos, la alta detección de enfermedad de Hansen en menores de 15 años revela la persistencia en la transmisión del bacilo y las dificultades de los programas de salud para el control de la enfermedad. El mayor tiempo para diagnóstico ocasiona secuelas y deformidades y, de ese modo, la búsqueda por los contactos constituye importante método para el diagnóstico temprano de la enfermedad en la infancia, cuando las señales clínicas no siempre son fáciles de identificarse y hay gran diversidad de formas clínicas en que la enfermedad puede presentarse.

16512 downloads

12.

Comparison between known propagation models using least squares tuning algorithm on 5.8 GHz in Amazon region cities
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Castro, Bruno S. L.

; Pinheiro, Márcio R.

; Cavalcante, Gervásio P. S.

; Gomes, Igor R.

; Carneiro, Oziel de O.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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jun 2011, Volume 10 N. 1 Pages 106 - 113

Abstract: En | Text: En | PDF: En

This paper presents a performance comparison between known propagation Models through least squares tuning algorithm for 5.8 GHz frequency band. The studied environment is based on the 12 cities located in Amazon Region. After adjustments and simulations, SUI Model showed the smaller RMS error and standard deviation when compared with COST231-Hata and ECC-33 models.

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For example, if you want to search for articles about
cases of dengue in Brasil in 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

See below the complete list of search indexes that can be used:

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

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