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Abstract Biodiesel serves as a biodegradable, non-toxic, and renewable fuel option that offers an alternative to traditional fossil fuels. This study aimed to examine the impact of elevating biodiesel content to 20% and 50% within regular diesel, with a focus on comprehending how these fuel mixtures influence variations in soot composition using Raman spectroscopy. The soot samples under analysis originated from commercial S10 diesel, as well as fuel blends containing 20% and 50% portions of sunflower and macaúba biodiesel, whereupon the use of this methodology for these fuels characterizes the novelty of this work. The outcomes derived from analyzing the soot samples revealed distinct characteristics in the G, D1, D3, and D4 bands. The ratio between the intensities of these D and G bands is closely indicative of the soot's structure. Consequently, this ratio was analyzed in this investigation to assess the effects of biodiesel concentration and engine rotation speed on soot characteristics. The conclusions found in this study indicated that there was minimal variation in the spectral characteristics of the soot samples across the different fuels and varying engine speeds. As a result, it is inferred that increasing the proportion of biodiesel in commercial diesel S10 did not have a significant impact on the structural composition of soot. biodegradable nontoxic, nontoxic non toxic, toxic non-toxic 20 50 spectroscopy S S1 work D1 D3 soots s structure Consequently speeds result 2 5

https://doi.org/10.1590/0370-44672023770101

A complete year of urology residency training under COVID-19: impact on education and health COVID19 COVID 19 COVID-19 COVID1 1 COVID-1 COVID-
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Henriques, João Victor T.

; Prezotti, José A.

; Anzolch, Karin M.

; Ruschi, Gustavo

; Almeida, Gilberto

; Seligra, Leonardo

; Favorito, Luciano A.

; Canalini, Alfredo F.

; Fernandes, Roni de C.

; Rodrigues, Fransber R. A.

; Silva, Caroline Santos

; Pereira, Anna Sophia Candiotto

; Bessa Jr., José de

; Gomes, Cristiano M.

International braz j urol

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2024, Volume 50 N. 5 Pages 605 - 615

Abstract: En | Text: En | PDF: En

ABSTRACT Objectives: To evaluate the impact of COVID-19 pandemics on clinical and surgical practice, educational activities, health and lifestyle behavior of Brazilian urology residents after 1 year of socio-economic restrictions. Materials and Methods: An electronic survey was e-mailed to all postgraduate (PG) students registered by the Brazilian Society of Urology. The survey included an assessment of socio-demographic, clinical practice, educational, health-related and behavior parameters. We also evaluated which subareas of urology were predominantly affected. A similar survey was adapted and sent to the directors of all urology residency programs. Results: COVID-19 pandemic has severely impacted the clinical, surgical, and educational activities of urology residents in Brazil. Urology residents reported >50% decrease in multiple surgical modalities. We highlight kidney transplantation surgeries (66.2%), minor surgeries (62.3%), endoscopic surgeries (42.6%) and reconstructive surgeries (38.8%). This could represent a critical skills gap that residents may face beyond the COVID-19 pandemic. Furthermore, PG students faced stressful situations that caused worsening of mental and physical health, such as getting redirected to assistance of COVID-19 patients (66.9%), and high rate of infection by SARS-CoV-2 (58.2%). Conclusions: The COVID-19 pandemic has severely impacted the clinical, surgical, and educational activities of urology residents in Brazil. This could represent a critical skills gap that residents may face beyond the COVID-19 pandemic. PG students faced stressful situations that caused worsening of mental and physical health such as redirection to assistance of COVID-19 patients, concern about their own contamination and of family members. Objectives COVID19 COVID 19 COVID-1 practice socioeconomic socio economic restrictions Methods emailed e mailed (PG sociodemographic, sociodemographic demographic, demographic socio-demographic healthrelated related parameters affected programs Results Brazil 50 >50 modalities 66.2%, 662 66.2% , 66 2 (66.2%) 62.3%, 623 62.3% 62 3 (62.3%) 42.6% 426 42 6 (42.6% 38.8%. 388 38.8% . 38 8 (38.8%) Furthermore 66.9%, 669 66.9% 9 (66.9%) SARSCoV2 SARSCoV SARS CoV SARS-CoV- 58.2%. 582 58.2% 58 (58.2%) Conclusions members COVID1 COVID- 5 >5 66.2 (66.2% 62.3 (62.3% 42.6 4 (42.6 38.8 (38.8% 66.9 (66.9% SARS-CoV 58.2 (58.2% > 66. (66.2 62. (62.3 42. (42. 38. (38.8 (66.9 58. (58.2 (66. (62. (42 (38. (58. (66 (62 (4 (38 (58 (6 ( (3 (5

https://doi.org/10.1590/s1677-5538.ibju.2024.0240

Diretriz Brasileira sobre a Saúde Cardiovascular no Climatério e na Menopausa – 2024 202 20 2
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Oliveira, Gláucia Maria Moraes de

; Almeida, Maria Cristina Costa de

; Arcelus, Carolina María Artucio

; Neto Espíndola, Larissa

; Rivera, Maria Alayde Mendonça

; Silva-Filho, Agnaldo Lopes da

; Marques-Santos, Celi

; Fernandes, César Eduardo

; Albuquerque, Carlos Japhet da Matta

; Freire, Claudia Maria Vilas

; Izar, Maria Cristina de Oliveira

; Costa, Maria Elizabeth Navegantes Caetano

; Castro, Marildes Luiza de

; Lemke, Viviana de Mello Guzzo

; Lucena, Alexandre Jorge Gomes de

; Brandão, Andréa Araujo

; Macedo, Ariane Vieira Scarlatelli

; Polanczyk, Carisi Anne

; Lantieri, Carla Janice Baister

; Nahas, Eliana Petri

; Alexandre, Elizabeth Regina Giunco

; Campana, Erika Maria Gonçalves

; Bragança, Érika Olivier Vilela

; Colombo, Fernanda Marciano Consolim

; Barbosa, Imara Correia de Queiroz

; Rivera, Ivan Romero

; Kulak, Jaime

; Moura, Lidia Ana Zytynski

; Pompei, Luciano de Mello

; Baccaro, Luiz Francisco Cintra

; Barbosa, Marcia Melo

; Rodrigues, Marcio Alexandre Hipólito

; Albernaz, Marco Aurelio

; Decoud, Maria Sotera Paniagua de

; Paiva, Maria Sanali Moura de Oliveira

; Sanchez-Zambrano, Martha Beatriz

; Campos, Milena dos Santos Barros

; Acevedo, Monica

; Ramirez, Monica Susana

; Souza, Olga Ferreira de

; Medeiros, Orlando Otávio de

; Carvalho, Regina Coeli Marques de

; Machado, Rogerio Bonassi

; Silva, Sheyla Cristina Tonheiro Ferro da

; Rodrigues, Thais de Carvalho Vieira

; Avila, Walkiria Samuel

; Costa-Paiva, Lucia Helena Simões da

; Wender, Maria Celeste Osorio

Arquivos Brasileiros de Cardiologia

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2024, Volume 121 N. 7 elocation e20240478

Abstract: Pt | Text: Pt | PDF: Pt

https://doi.org/10.36660/abc.20240478

Brazilian Guideline on Menopausal Cardiovascular Health – 2024 202 20 2
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Oliveira, Gláucia Maria Moraes de

; Almeida, Maria Cristina Costa de

; Arcelus, Carolina María Artucio

; Espíndola Neto, Larissa

; Rivera, Maria Alayde Mendonça

; Silva-Filho, Agnaldo Lopes da

; Marques-Santos, Celi

; Fernandes, César Eduardo

; Albuquerque, Carlos Japhet da Matta

; Freire, Claudia Maria Vilas

; Izar, Maria Cristina de Oliveira

; Costa, Maria Elizabeth Navegantes Caetano

; Castro, Marildes Luiza de

; Lemke, Viviana de Mello Guzzo

; Lucena, Alexandre Jorge Gomes de

; Brandão, Andréa Araujo

; Macedo, Ariane Vieira Scarlatelli

; Polanczyk, Carisi Anne

; Lantieri, Carla Janice Baister

; Nahas, Eliana Petri

; Alexandre, Elizabeth Regina Giunco

; Campana, Erika Maria Gonçalves

; Bragança, Érika Olivier Vilela

; Colombo, Fernanda Marciano Consolim

; Barbosa, Imara Correia de Queiroz

; Rivera, Ivan Romero

; Kulak, Jaime

; Moura, Lidia Ana Zytynski

; Pompei, Luciano de Mello

; Baccaro, Luiz Francisco Cintra

; Barbosa, Marcia Melo

; Rodrigues, Marcio Alexandre Hipólito

; Albernaz, Marco Aurelio

; Decoud, Maria Sotera Paniagua de

; Paiva, Maria Sanali Moura de Oliveira

; Sanchez-Zambrano, Martha Beatriz

; Campos, Milena dos Santos Barros

; Acevedo, Monica

; Ramirez, Monica Susana

; Souza, Olga Ferreira de

; Medeiros, Orlando Otávio de

; Carvalho, Regina Coeli Marques de

; Machado, Rogerio Bonassi

; Silva, Sheyla Cristina Tonheiro Ferro da

; Rodrigues, Thais de Carvalho Vieira

; Avila, Walkiria Samuel

; Costa-Paiva, Lucia Helena Simões da

; Wender, Maria Celeste Osorio

Revista Brasileira de Ginecologia e Obstetrícia

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2024, Volume 46 elocation e-rbgo100

Abstract: En | Text: En | PDF: En

https://doi.org/10.61622/rbgo/2024rbgo100

[SciELO Preprints] - Brazilian Guidelines for In-office and Out-of-office Blood Pressure Measurement – 2023
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Feitosa, Audes Diógenes de Magalhães Barroso, Weimar Kunz Sebba Mion Júnior, Décio Nobre, Fernando Mota-Gomes, Marco Antonio Jardim, Paulo Cesar Brandão Veiga Amodeo, Celso Camargo, Adriana Alessi, Alexandre Sousa, Ana Luiza Lima Brandão, Andréa Araujo Pio-Abreu, Andrea Sposito, Andrei Carvalho Pierin, Angela Maria Geraldo Paiva, Annelise Machado Gomes de Spinelli, Antonio Carlos de Souza Machado, Carlos Alberto Poli-de-Figueiredo, Carlos Eduardo Rodrigues, Cibele Isaac Saad Forjaz, Cláudia Lúcia de Moraes Sampaio, Diogo Pereira Santos Barbosa, Eduardo Costa Duarte Freitas, Elizabete Viana de Cestário , Elizabeth do Espírito Santo Muxfeldt, Elizabeth Silaid Lima Júnior, Emilton Campana, Erika Maria Gonçalves Feitosa, Fabiana Gomes Aragão Magalhães Consolim-Colombo, Fernanda Marciano Almeida, Fernando Antônio de Silva, Giovanio Vieira da Moreno Júnior, Heitor Finimundi, Helius Carlos Guimarães, Isabel Cristina Britto Gemelli, João Roberto Barreto Filho, José Augusto Soares Vilela-Martin, José Fernando Ribeiro, José Marcio Yugar-Toledo, Juan Carlos Magalhães, Lucélia Batista Neves Cunha Drager, Luciano Ferreira Bortolotto, Luiz Aparecido Alves, Marco Antonio de Melo Malachias, Marcus Vinícius Bolívar Neves, Mario Fritsch Toros Santos, Mayara Cedrim Dinamarco, Nelson Moreira Filho, Osni Passarelli Júnior, Oswaldo Valverde de Oliveira Vitorino, Priscila Valverde de Oliveira Miranda, Roberto Dischinger Bezerra, Rodrigo Pedrosa, Rodrigo Pinto Paula, Rogério Baumgratz de Okawa, Rogério Toshiro Passos Póvoa, Rui Manuel dos Santos Fuchs, Sandra C. Inuzuka, Sayuri Ferreira-Filho, Sebastião R. Paffer Fillho, Silvio Hock de Jardim, Thiago de Souza Veiga Guimarães Neto, Vanildo da Silva Koch, Vera Hermina Gusmão, Waléria Dantas Pereira Oigman, Wille Nadruz, Wilson

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Publication date: 2023-09-23

Abstract: En Es Pt

Hypertension is one of the primary modifiable risk factors for morbidity and mortality worldwide, being a major risk factor for coronary artery disease, stroke, and kidney failure. Furthermore, it is highly prevalent, affecting more than one-third of the global population. Blood pressure measurement is a MANDATORY procedure in any medical care setting and is carried out by various healthcare professionals. However, it is still commonly performed without the necessary technical care. Since the diagnosis relies on blood pressure measurement, it is clear how important it is to handle the techniques, methods, and equipment used in its execution with care. It should be emphasized that once the diagnosis is made, all short-term, medium-term, and long-term investigations and treatments are based on the results of blood pressure measurement. Therefore, improper techniques and/or equipment can lead to incorrect diagnoses, either underestimating or overestimating values, resulting in inappropriate actions and significant health and economic losses for individuals and nations. Once the correct diagnosis is made, as knowledge of the importance of proper treatment advances, with the adoption of more detailed normal values and careful treatment objectives towards achieving stricter blood pressure goals, the importance of precision in blood pressure measurement is also reinforced. Blood pressure measurement (described below) is usually performed using the traditional method, the so-called casual or office measurement. Over time, alternatives have been added to it, through the use of semi-automatic or automatic devices by the patients themselves, in waiting rooms or outside the office, in their own homes, or in public spaces. A step further was taken with the use of semi-automatic devices equipped with memory that allow sequential measurements outside the office (ABPM; or HBPM) and other automatic devices that allow programmed measurements over longer periods (HBPM). Some aspects of blood pressure measurement can interfere with obtaining reliable results and, consequently, cause harm in decision-making. These include the importance of using average values, the variation in blood pressure during the day, and short-term variability. These aspects have encouraged the performance of a greater number of measurements in various situations, and different guidelines have advocated the use of equipment that promotes these actions. Devices that perform HBPM or ABPM, which, in addition to allowing greater precision, when used together, detect white coat hypertension (WCH), masked hypertension (MH), sleep blood pressure alterations, and resistant hypertension (RHT) (defined in Chapter 2 of this guideline), are gaining more and more importance. Taking these details into account, we must emphasize that information related to diagnosis, classification, and goal setting is still based on office blood pressure measurement, and for this reason, all attention must be given to the proper execution of this procedure.

La hipertensión arterial (HTA) es uno de los principales factores de riesgo modificables para la morbilidad y mortalidad en todo el mundo, siendo uno de los mayores factores de riesgo para la enfermedad de las arterias coronarias, el accidente cerebrovascular (ACV) y la insuficiencia renal. Además, es altamente prevalente y afecta a más de un tercio de la población mundial. La medición de la presión arterial (PA) es un procedimiento OBLIGATORIO en cualquier atención médica o realizado por diferentes profesionales de la salud. Sin embargo, todavía se realiza comúnmente sin los cuidados técnicos necesarios. Dado que el diagnóstico se basa en la medición de la PA, es claro el cuidado que debe haber con las técnicas, los métodos y los equipos utilizados en su realización. Debemos enfatizar que una vez realizado el diagnóstico, todas las investigaciones y tratamientos a corto, mediano y largo plazo se basan en los resultados de la medición de la PA. Por lo tanto, las técnicas y/o equipos inadecuados pueden llevar a diagnósticos incorrectos, subestimando o sobreestimando valores y resultando en conductas inadecuadas y pérdidas significativas para la salud y la economía de las personas y las naciones. Una vez realizado el diagnóstico correcto, a medida que avanza el conocimiento sobre la importancia del tratamiento adecuado, con la adopción de valores de normalidad más detallados y objetivos de tratamiento más cuidadosos hacia metas de PA más estrictas, también se refuerza la importancia de la precisión en la medición de la PA. La medición de la PA (descrita a continuación) generalmente se realiza mediante el método tradicional, la llamada medición casual o de consultorio. Con el tiempo, se han agregado alternativas a través del uso de dispositivos semiautomáticos o automáticos por parte del propio paciente, en salas de espera o fuera del consultorio, en su propia residencia o en espacios públicos. Se dio un paso más con el uso de dispositivos semiautomáticos equipados con memoria que permiten mediciones secuenciales fuera del consultorio (AMPA; o MRPA) y otros automáticos que permiten mediciones programadas durante períodos más largos (MAPA). Algunos aspectos en la medición de la PA pueden interferir en la obtención de resultados confiables y, en consecuencia, causar daños en las decisiones a tomar. Estos incluyen la importancia de usar valores promedio, la variación de la PA durante el día y la variabilidad a corto plazo. Estos aspectos han alentado la realización de un mayor número de mediciones en diversas situaciones, y diferentes pautas han abogado por el uso de equipos que promuevan estas acciones. Los dispositivos que realizan MRPA o MAPA, que además de permitir una mayor precisión, cuando se usan juntos, detectan la hipertensión de bata blanca (HBB), la hipertensión enmascarada (HM), las alteraciones de la PA durante el sueño y la hipertensión resistente (HR) (definida en el Capítulo 2 de esta guía), están ganando cada vez más importancia. Teniendo en cuenta estos detalles, debemos enfatizar que la información relacionada con el diagnóstico, la clasificación y el establecimiento de objetivos todavía se basa en la medición de la presión arterial en el consultorio, y por esta razón, se debe prestar toda la atención a la ejecución adecuada de este procedimiento.

A hipertensão arterial (HA) é um dos principais fatores de risco modificáveis para morbidade e mortalidade em todo o mundo, sendo um dos maiores fatores de risco para doença arterial coronária, acidente vascular cerebral (AVC) e insuficiência renal. Além disso, é altamente prevalente e atinge mais de um terço da população mundial. A medida da PA é procedimento OBRIGATÓRIO em qualquer atendimento médico ou realizado por diferentes profissionais de saúde. Contudo, ainda é comumente realizada sem os cuidados técnicos necessários. Como o diagnóstico se baseia na medida da PA, fica claro o cuidado que deve haver com as técnicas, os métodos e os equipamentos utilizados na sua realização. Deve-se reforçar que, feito o diagnóstico, toda a investigação e os tratamentos de curto, médio e longo prazos são feitos com base nos resultados da medida da PA. Assim, técnicas e/ou equipamentos inadequados podem levar a diagnósticos incorretos, tanto subestimando quanto superestimando valores e levando a condutas inadequadas e grandes prejuízos à saúde e à economia das pessoas e das nações. Uma vez feito o diagnóstico correto, na medida em que avança o conhecimento da importância do tratamento adequado, com a adoção de valores de normalidade mais detalhados e com objetivos de tratamento mais cuidadosos no sentido do alcance de metas de PA mais rigorosas, fica também reforçada a importância da precisão na medida da PA. A medida da PA (descrita a seguir) é habitualmente feita pelo método tradicional, a assim chamada medida casual ou de consultório. Ao longo do tempo, foram agregadas alternativas a ela, mediante o uso de equipamentos semiautomáticos ou automáticos pelo próprio paciente, nas salas de espera ou fora do consultório, em sua própria residência ou em espaços públicos. Um passo adiante foi dado com o uso de equipamentos semiautomáticos providos de memória que permitem medidas sequenciais fora do consultório (AMPA; ou MRPA) e outros automáticos que permitem medidas programadas por períodos mais prolongados (MAPA). Alguns aspectos na medida da PA podem interferir na obtenção de resultados fidedignos e, consequentemente, causar prejuízo nas condutas a serem tomadas. Entre eles, estão: a importância de serem utilizados valores médios, a variação da PA durante o dia e a variabilidade a curto prazo. Esses aspectos têm estimulado a realização de maior número de medidas em diversas situações, e as diferentes diretrizes têm preconizado o uso de equipamentos que favoreçam essas ações. Ganham cada vez mais espaço os equipamentos que realizam MRPA ou MAPA, que, além de permitirem maior precisão, se empregados em conjunto, detectam a HA do avental branco (HAB), HA mascarada (HM), alterações da PA no sono e HA resistente (HAR) (definidos no Capítulo 2 desta diretriz). Resguardados esses detalhes, devemos ressaltar que as informações relacionadas a diagnóstico, classificação e estabelecimento de metas ainda são baseadas na medida da PA de consultório e, por esse motivo, toda a atenção deve ser dada à realização desse procedimento.

https://doi.org/10.1590/SciELOPreprints.7057

Multidisciplinary Scientific Cruises for Environmental Characterization in the Santos Basin – Methods and Sampling Design
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Moreira, Daniel L.

; Dalto, Adriana G.

; Figueiredo JR, Alberto G.

; Valerio, Aline M.

; Detoni, Amalia M. S.

; Bonecker, Ana C. T.

; Signori, Camila N.

; Namiki, Cláudia

; Sasaki, Dalton K.

; Pupo, Daniel V.

; Silva, Danilo A.

; Kutner, Deborah S.

; Duque-Castaño, Diana C.

; Marcon, Eduardo H.

; Gallotta, Fabiana D. C.

; Paula, Fabiana S.

; Gallucci, Fabiane

; Roque, Gabriela C. F.

; Campos, Giulia S.

; Fonseca, Gustavo

; Mattos, Gustavo

; Lavrado, Helena P.

; Silveira, Ilson C. A. da

; Costa, Jessica O.

; Santos Filho, João R. dos

; Carneiro, Juliane C.

; Moreira, Julio C.F.

; Rozo, Laura

; Araujo, Leandro F.M.

; Lazzari, Letícia

; Silva, Letícia O. da

; Michelazzo, Luan S.

; Fernandes, Luciano F.

; Dottori, Marcelo

; Araújo Jr., Marcus A. G. de

; Chuqui, Mateus G.

; Ceccopieri, Milena

; Borges-Silva, Milton

; Kampel, Milton

; Bergo, Natascha M.

; Silva, Paulo V. M.

; Tura, Pedro M.

; Moura, Rafael B. de

; Romano, Renato G.

; Martins, Renato P.

; Carreira, Renato S.

; Toledo, Rodrigo G.A.

; Bonecker, Sérgio L.C.

; Disaró, Sibelle T.

; Rodrigues, Silvana V.

; Corbisier, Thais N.

; Vicente, Thaisa M.

; Paiva, Vitor G. de

; Pellizari, Vivian H.

; Belo, Wellington C.

; Brandini, Frederico P.

; Sousa, Silvia H.M

Ocean and Coastal Research

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2023, Volume 71 Suppl. 3 elocation e23022

Abstract: En | Text: En | PDF: En

Abstract The Santos Basin (SB) is the main petroliferous basin in the Brazilian continental margin and one of the most studied marine areas in Brazil. However, historical data suggest that new efforts should be carried out to acquire quantitative biological data, especially in the deep sea, to establish the baseline of essential ocean variables in different ecosystems for future monitoring programs. The Brazilian energy company Petrobras planned and executed 24 oceanographic cruises over a period of 2 years to assess the benthic (SANSED cruise) and pelagic (SANAGU cruise) systems of the SB (356 days at sea in 2019 and 2021/2022). These efforts were part of the Santos Project, which comprised a comprehensive environmental study aimed at investigating benthic and pelagic variables to characterize ecology, biogeochemistry, thermohaline properties of water masses, and ocean circulation patterns, geomorphology, and sedimentology, as well as organic and inorganic chemistry. Here we present the detailed sampling designs and the field methods employed on board, during the SB scientific cruises. All sampling protocols were based on standardized approaches. For the benthos analyses, triplicate sediment samples were performed using a GOMEX-type box corer (0.25 m²) or a large modified Van Veen grab (0.75 m²) at 100 stations ranging from 25 to 2400 m depth. At each station, 25 geochemical and physico-chemical parameters were analyzed in addition to micro-, meio-, and macrofauna and living foraminifera samples. For the pelagic system, 60 stations were selected to investigate the plankton community, ranging in size from pico- to macroplankton, through vertical, horizontal, and oblique net hauls (20, 200, and 500 μm mesh size), as well as 25 biogeochemical parameters collected with an aid of a CTD-rosette sampler. Part of this scientific information also serves the Regional Environmental Characterization Project (PCR-BS) in support of Petrobras’ Santos Basin drilling licensing process led by the Brazilian Environmental Agency – IBAMA. This project contributes to the sustainable development of the SB, in line with the guidelines of the United Nations Decade of Ocean Science for Sustainable Development. (SB Brazil However programs SANSED cruise SANAGU 356 (35 201 2021/2022. 20212022 2021/2022 . 2021 2022 2021/2022) ecology biogeochemistry masses patterns geomorphology sedimentology chemistry board approaches analyses GOMEXtype GOMEX type 0.25 025 0 (0.2 m² 0.75 075 75 (0.7 10 240 depth station physicochemical physico chemical micro, micro , micro- meio, meio meio- system 6 community pico macroplankton vertical horizontal 20, 20 (20 200 50 size, size) CTDrosette CTD rosette sampler PCRBS PCR BS (PCR-BS IBAMA Development 35 (3 2021202 2021/202 202 0.2 02 (0. 0.7 07 7 1 (2 5 3 ( 202120 2021/20 0. (0 20212 2021/2 2021/

https://doi.org/10.1590/2675-2824071.22072dlm

Accuracy of the urine point-of-care circulating cathodic antigen assay for diagnosing Schistosomiasis mansoni infection in Brazil: A multicenter study pointofcare point care Brazil
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Pieri, Otavio Sarmento

; Bezerra, Fernando Schemelzer Moraes

; Coelho, Paulo Marcos Zech

; Enk, Martin Johannes

; Favre, Tereza Cristina

; Graeff-Teixeira, Carlos

; Oliveira, Ricardo Riccio

; Reis, Mitermayer Galvão dos

; Andrade, Lee Senhorinha de Almeida

; Beck, Lilian Christina Nóbrega Holsbach

; Favero, Vivian

; Fialho, Thainá Rodrigues de Souza

; Guimarães, Ricardo José de Paula Souza e

; Oliveira, Bruna Souza Santos

; Pascoal, Vanessa Fey

; Pinheiro, Marta Cristhiany Cunha

; Santos, Ronald Alves dos

; Silva, Luciano Kalabric

; Siqueira, Isadora Cristina de

; Souza, Renata Perotto de

; Katz, Naftale

Revista da Sociedade Brasileira de Medicina Tropical

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2023, Volume 56 elocation e0238-2022

Abstract: En | Text: En | PDF: En

ABSTRACT Background: The World Health Organization recommends a market-ready, urine-based point-of-care diagnostic test for circulating cathodic antigens (CCA) to determine the prevalence of S. mansoni. This study evaluated the performance of the URINE CCA (SCHISTO) ECO TESTE® (POC-ECO), which is currently available in Brazil. Methods: Residents from eight sites with different prevalence estimates provided one urine sample for POC-ECO and one stool sample for Kato-Katz (KK) and Helmintex® (HTX) testing as an egg-detecting reference for infection status. Results: None of the study sites had significantly higher POC-ECO accuracy than KK. Conclusions: POC-ECO is not currently recommended in Brazilian schistosomiasis elimination programs. Background marketready, marketready market ready, ready market-ready urinebased based pointofcare point care (CCA S mansoni SCHISTO (SCHISTO TESTE POCECO, POCECO POC , (POC-ECO) Brazil Methods KatoKatz Kato Katz KK (KK Helmintex HTX (HTX eggdetecting egg detecting status Results Conclusions programs (POC-ECO

https://doi.org/10.1590/0037-8682-0238-2022

IMPACTO-MR: um estudo brasileiro de plataforma nacional para avaliar infecções e multirresistência em unidades de terapia intensiva IMPACTOMR IMPACTO MR IMPACTO-MR
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Tomazini, Bruno M

; Nassar Jr, Antonio Paulo

; Lisboa, Thiago Costa

; Azevedo, Luciano César Pontes de

; Veiga, Viviane Cordeiro

; Catarino, Daniela Ghidetti Mangas

; Fogazzi, Debora Vacaro

; Arns, Beatriz

; Piastrelli, Filipe Teixeira

; Dietrich, Camila

; Negrelli, Karina Leal

; Jesuíno, Isabella de Andrade

; Reis, Luiz Fernando Lima

; Mattos, Renata Rodrigues de

; Pinheiro, Carla Cristina Gomes

; Luz, Mariane Nascimento

; Spadoni, Clayse Carla da Silva

; Moro, Elisângela Emilene

; Bueno, Flávia Regina

; Sampaio, Camila Santana Justo Cintra

; Silva, Débora Patrício

; Baldassare, Franca Pellison

; Silva, Ana Cecilia Alcantara

; Veiga, Thabata

; Barbante, Leticia

; Lambauer, Marianne

; Campos, Viviane Bezerra

; Santos, Elton

; Santos, Renato Hideo Nakawaga

; Laranjeiras, Ligia Nasi

; Valeis, Nanci

; Santucci, Eliana

; Miranda, Tamiris Abait

; Patrocínio, Ana Cristina Lagoeiro do

; Carvalho, Andréa de

; Sousa, Eduvirgens Maria Couto de

; Sousa, Ancelmo Honorato Ferraz de

; Malheiro, Daniel Tavares

; Bezerra, Isabella Lott

; Rodrigues, Mirian Batista

; Malicia, Julliana Chicuta

; Silva, Sabrina Souza da

; Gimenes, Bruna dos Passos

; Sesin, Guilhermo Prates

; Zavascki, Alexandre Prehn

; Sganzerla, Daniel

; Medeiros, Gregory Saraiva

; Santos, Rosa da Rosa Minho dos

; Silva, Fernanda Kelly Romeiro

; Cheno, Maysa Yukari

; Abrahão, Carolinne Ferreira

; Oliveira Junior, Haliton Alves de

; Rocha, Leonardo Lima

; Nunes Neto, Pedro Aniceto

; Pereira, Valéria Chagas

; Paciência, Luis Eduardo Miranda

; Bueno, Elaine Silva

; Caser, Eliana Bernadete

; Ribeiro, Larissa Zuqui

; Fernandes, Caio Cesar Ferreira

; Garcia, Juliana Mazzei

; Silva, Vanildes de Fátima Fernandes

; Santos, Alisson Junior dos

; Machado, Flávia Ribeiro

; Souza, Maria Aparecida de

; Ferronato, Bianca Ramos

; Urbano, Hugo Corrêa de Andrade

; Moreira, Danielle Conceição Aparecida

; Souza-Dantas, Vicente Cés de

; Duarte, Diego Meireles

; Coelho, Juliana

; Figueiredo, Rodrigo Cruvinel

; Foreque, Fernanda

; Romano, Thiago Gomes

; Cubos, Daniel

; Spirale, Vladimir Miguel

; Nogueira, Roberta Schiavon

; Maia, Israel Silva

; Zandonai, Cassio Luis

; Lovato, Wilson José

; Cerantola, Rodrigo Barbosa

; Toledo, Tatiana Gozzi Pancev

; Tomba, Pablo Oscar

; Almeida, Joyce Ramos de

; Sanches, Luciana Coelho

; Pierini, Leticia

; Cunha, Mariana

; Sousa, Michelle Tereza

; Azevedo, Bruna

; Dal-Pizzol, Felipe

; Damasio, Danusa de Castro

; Bainy, Marina Peres

; Beduhn, Dagoberta Alves Vieira

; Jatobá, Joana D’Arc Vila Nova

; Moura, Maria Tereza Farias de

; Rego, Leila Rezegue de Moraes

; Silva, Adria Vanessa da

; Oliveira, Luana Pontes

; Sodré Filho, Eliene Sá

; Santos, Silvana Soares dos

; Neves, Itallo de Lima

; Leão, Vanessa Cristina de Aquino

; Paes, João Lucidio Lobato

; Silva, Marielle Cristina Mendes

; Oliveira, Cláudio Dornas de

; Santiago, Raquel Caldeira Brant

; Paranhos, Jorge Luiz da Rocha

; Wiermann, Iany Grinezia da Silva

; Pedroso, Durval Ferreira Fonseca

; Sawada, Priscilla Yoshiko

; Prestes, Rejane Martins

; Nascimento, Glícia Cardoso

; Grion, Cintia Magalhães Carvalho

; Carrilho, Claudia Maria Dantas de Maio

; Dantas, Roberta Lacerda Almeida de Miranda

; Silva, Eliane Pereira

; Silva, Antônio Carlos da

; Oliveira, Sheila Mara Bezerra de

; Golin, Nicole Alberti

; Tregnago, Rogerio

; Lima, Valéria Paes

; Silva, Kamilla Grasielle Nunes da

; Boschi, Emerson

; Buffon, Viviane

; Machado, André Sant’Ana

; Capeletti, Leticia

; Foernges, Rafael Botelho

; Carvalho, Andréia Schubert de

; Oliveira Junior, Lúcio Couto de

; Oliveira, Daniela Cunha de

; Silva, Everton Macêdo

; Ribeiro, Julival

; Pereira, Francielle Constantino

; Salgado, Fernanda Borges

; Deutschendorf, Caroline

; Silva, Cristofer Farias da

; Gobatto, Andre Luiz Nunes

; Oliveira, Carolaine Bomfim de

; Dracoulakis, Marianna Deway Andrade

; Alvaia, Natália Oliveira Santos

; Souza, Roberta Machado de

; Araújo, Larissa Liz Cardoso de

; Melo, Rodrigo Morel Vieira de

; Passos, Luiz Carlos Santana

; Vidal, Claudia Fernanda de Lacerda

; Rodrigues, Fernanda Lopes de Albuquerque

; Kurtz, Pedro

; Shinotsuka, Cássia Righy

; Tavares, Maria Brandão

; Santana, Igor das Virgens

; Gavinho, Luciana Macedo da Silva

; Nascimento, Alaís Brito

; Pereira, Adriano J

; Cavalcanti, Alexandre Biasi

Revista Brasileira de Terapia Intensiva

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dec 2022, Volume 34 N. 4 Pages 418 - 425

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

RESUMO Objetivo: Descrever o IMPACTO-MR, um estudo brasileiro de plataforma nacional em unidades de terapia intensiva focado no impacto das infecções por bactérias multirresistentes relacionadas à assistência à saúde. Métodos: Descrevemos a plataforma IMPACTO-MR, seu desenvolvimento, critérios para seleção das unidades de terapia intensiva, caracterização da coleta de dados, objetivos e projetos de pesquisa futuros a serem realizados na plataforma. Resultados: Os dados principais foram coletados por meio do Epimed Monitor System® e consistiram em dados demográficos, dados de comorbidades, estado funcional, escores clínicos, diagnóstico de internação e diagnósticos secundários, dados laboratoriais, clínicos e microbiológicos e suporte de órgãos durante a internação na unidade de terapia intensiva, entre outros. De outubro de 2019 a dezembro de 2020, 33.983 pacientes de 51 unidades de terapia intensiva foram incluídos no banco de dados principal. Conclusão: A plataforma IMPACTO-MR é um banco de dados clínico brasileiro de unidades de terapia intensiva focado na pesquisa do impacto das infecções por bactérias multirresistentes relacionadas à assistência à saúde. Essa plataforma fornece dados para o desenvolvimento e pesquisa de unidades de terapia intensiva individuais e ensaios clínicos observacionais e prospectivos multicêntricos. Objetivo IMPACTOMR, IMPACTOMR IMPACTO MR, MR saúde Métodos Resultados System demográficos comorbidades funcional secundários laboratoriais outros 201 2020 33983 33 983 33.98 5 principal Conclusão multicêntricos 20 202 3398 3 98 33.9 2 339 9 33.

ABSTRACT Objective: To describe the IMPACTO-MR, a Brazilian nationwide intensive care unit platform study focused on the impact of health care-associated infections due to multidrug-resistant bacteria. Methods: We described the IMPACTO-MR platform, its development, criteria for intensive care unit selection, characterization of core data collection, objectives, and future research projects to be held within the platform. Results: The core data were collected using the Epimed Monitor System® and consisted of demographic data, comorbidity data, functional status, clinical scores, admission diagnosis and secondary diagnoses, laboratory, clinical, and microbiological data, and organ support during intensive care unit stay, among others. From October 2019 to December 2020, 33,983 patients from 51 intensive care units were included in the core database. Conclusion: The IMPACTO-MR platform is a nationwide Brazilian intensive care unit clinical database focused on researching the impact of health care-associated infections due to multidrug-resistant bacteria. This platform provides data for individual intensive care unit development and research and multicenter observational and prospective trials. Objective IMPACTOMR, IMPACTOMR IMPACTO MR, MR careassociated associated multidrugresistant multidrug resistant bacteria Methods selection collection objectives Results System status scores diagnoses laboratory stay others 201 2020 33983 33 983 33,98 5 Conclusion trials 20 202 3398 3 98 33,9 2 339 9 33,

https://doi.org/10.5935/0103-507x.20220209-pt

10.

EXTRAÇÃO DE CORANTES TÊXTEIS UTILIZANDO SISTEMAS AQUOSOS BIFÁSICOS COMPOSTOS POR 2-PROPANOL E SAIS DE SULFATO
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Pimentel, Juliana Gomes

; Gandolfi, Olga Reinert Ramos

; Sampaio, Vanessa Santos

; Veríssimo, Lizzy Ayra Alcântara

; Rodrigues, Luciano Brito

; Veloso, Cristiane Martins

; Fontan, Rafael da Costa Ilhéu

; Bonomo, Renata Cristina Ferreira

Química Nova

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sep 2022, Volume 45 N. 9 Pages 1039 - 1046

Abstract: Pt | Text: Pt | PDF: Pt

Aqueous Two Phase Systems (ATPS) composed of 2-propanol + inorganic salt (Na2SO4/MgSO4) + water, at different temperatures T = (20, 30, 40 and 50) °C were applied in the partition studies of the textile dyes Yellow, Blue Royal and Red Dianix CC. The thermodynamic parameters of the free transfer energy (∆Gtr), enthalpy (∆Htr) and entropy (∆Str), respectively, were determined for dye partitioning, using the Van’t Hoff equation. The values of the partition coefficients of textile dyes Yellow, Royal Blue and Red Dianix CC, ranged from 14.21 to 1610.00, 15.15 to 994.00 and 17.32 to 311.75, respectively; and with dye extraction yields ranging from 93.17 to 99.93; 94.53 to 99.89 and 97.19 to 99.64, respectively. Based on the ∆Gtr results, it was verified that the dyes partition process was thermodynamically spontaneous, in all evaluated systems. For the 2-propanol + sodium sulfate ATPS, there was a prevalence of the enthalpic contribution over the entropic contribution (∆Htr > ∆Str), while for the 2-propanol + magnesium sulfate systems, a greater predominance of the entropic contribution was observed (∆Htr < ∆Str). The recovery yields (Y) values obtained were above 90% for all systems.

https://doi.org/10.21577/0100-4042.20170911

11.

Risco nutricional e cardiovascular em idosos quilombolas
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Silva, Thalita Costa da

; Martins Neto, Carlos

; Carvalho, Carolina Abreu de

; Viola, Poliana Cristina de Almeida Fonseca

; Rodrigues, Lívia dos Santos

; Oliveira, Bruno Luciano Carneiro Alves de

Ciência & Saúde Coletiva

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jan 2022, Volume 27 N. 1 Pages 219 - 230

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

Resumo O objetivo deste artigo é avaliar o risco nutricional e cardiovascular segundo medidas antropométricas em idosos quilombolas do estado do Maranhão. Trata-se de estudo transversal realizado em 11 comunidades remanescentes de quilombolas do município de Bequimão, Maranhão, Brasil. Realizou-se censo da população idosa que representou 205 pessoas. Foram estimados os riscos nutricional e cardiovascular por meio dos indicadores antropométricos segundo sexo e idade. Realizou-se Testes de Qui-quadrado de Pearson ou Exacto de Fisher e análises de variância. Diferenças foram consideradas estatisticamente significantes quando p<0,05. Idosos quilombolas vivem em precárias condições de moradia e de infraestrutura sanitária, com elevado risco nutricional e cardiovascular, mas com diferenças entre sexo e idade. O excesso de peso foi mais prevalente em mulheres e idosos mais jovens, enquanto os homens e idosos com 80 ou mais anos apresentaram-se mais desnutridos e com maior perda de massa corporal. O risco cardiovascular foi maior entre as mulheres e em todas as faixas etárias. Idosos quilombolas vivem em vulnerabilidade socioeconômica e apresentaram alta prevalência de baixo peso, perda de massa muscular e alto risco cardiovascular, sendo maior risco entre mulheres e idosos do grupo de maior idade.

Abstract This article aims to assess nutritional and cardiovascular disease (CVD) risk based on anthropometric measures among older persons living in Quilombola communities in the state of Maranhão, Brazil. We conducted a cross-sectional study with 205 older persons living in 11 Quilombola communities in Bequimão, Maranhão. Nutritional and CVD risk were estimated according to sex and age group based on anthropometric indicators using Pearson’s chi-square or Fisher’s exact tests and analysis of variance, adopting a significance level of p<0.05. The study participants suffer precarious housing, basic sanitation and social conditions. Prevalence of nutritional and CDV risk was high across the sample, showing differences between sexes and age groups. Prevalence of excess weight was higher in women and the youngest age group, while prevalence of malnourishment and loss of muscle mass was higher in men and individuals aged 80 years and over. Prevalence of CVD risk was high across all age groups and higher in women than men. The older persons living in the Quilombola communities investigated by this study are socially vulnerable and showed high prevalence of low weight, loss of muscle mass and CDV risk. The prevalence of CVD risk was higher among women and the oldest age group.

https://doi.org/10.1590/1413-81232022271.30132020

12.

Risco nutricional e cardiovascular em idosos quilombolas
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Silva, Thalita Costa da

; Martins Neto, Carlos

; Carvalho, Carolina Abreu de

; Viola, Poliana Cristina de Almeida Fonseca

; Rodrigues, Lívia dos Santos

; Oliveira, Bruno Luciano Carneiro Alves de

Ciência & Saúde Coletiva

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jan 2022, Volume 27 N. 1 Pages 219 - 230

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

https://doi.org/10.1590/1413-81232022271.30132020

13.

SARS-CoV-2 in saliva, viremia and seroprevalence for COVID-19 surveillance at a single hematopoietic stem cell transplantation center: a prospective cohort study
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Mobile, Rafael Zancan

; Warnawin, Stephanie von Stein Cubas

; Kojo, Teresinha Keiko

; Rodrigues, Jéssica Alline Pereira

; Cavilha, Adriana Mendes de Quadros

; Zerbinati, Rodrigo Melim

; Adamoski, Douglas

; Oliveira, Jaqueline Carvalho de

; Conzentino, Marcelo Santos

; Huergo, Luciano Fernandes

; Gradia, Daniela Fiori

; Braz-Silva, Paulo Henrique

; Schussel, Juliana Lucena

Revista do Instituto de Medicina Tropical de São Paulo

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2022, Volume 64 elocation e39

Abstract: En | Text: En | PDF: En

ABSTRACT This prospective cohort study aims to analyze the surveillance of COVID-19 at a single hematopoietic stem cell transplantation (HSCT) center in Brazil, in 29 patients undergoing allogeneic HSCT and 57 healthcare workers (nurses and dentists), through viral shedding of SARS-CoV-2 in saliva and plasma and seroprevalence of anti-SARS-CoV-2 IgG. In addition, we report two cases with prolonged persistent detection of SARS-CoV-2 without seroconversion. The sample collection was performed seven times for patients and five times for healthcare workers. Only two patients tested positive for SARS-CoV-2 in their saliva and plasma samples (6.9%) without seroconversion. All healthcare workers were asymptomatic and none tested positive. Two patients (6.9%) and four nurses (8%) had positive serology. No dentists had positive viral detection or positive serology. Our results reflect a low prevalence of positive RT-PCR and seroprevalence of SARS-CoV-2 in patients and healthcare workers at a single HSCT center. Results have also corroborated how the rigorous protocols adopted in transplant centers were even more strengthened in this pandemic scenario.

https://doi.org/10.1590/s1678-9946202264039

14.

Diretrizes Brasileiras de Hipertensão Arterial – 2020
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Barroso, Weimar Kunz Sebba

; Rodrigues, Cibele Isaac Saad

; Bortolotto, Luiz Aparecido

; Mota-Gomes, Marco Antônio

; Brandão, Andréa Araujo

; Feitosa, Audes Diógenes de Magalhães

; Machado, Carlos Alberto

; Poli-de-Figueiredo, Carlos Eduardo

; Amodeo, Celso

; Mion Júnior, Décio

; Barbosa, Eduardo Costa Duarte

; Nobre, Fernando

; Guimarães, Isabel Cristina Britto

; Vilela-Martin, José Fernando

; Yugar-Toledo, Juan Carlos

; Magalhães, Maria Eliane Campos

; Neves, Mário Fritsch Toros

; Jardim, Paulo César Brandão Veiga

; Miranda, Roberto Dischinger

; Póvoa, Rui Manuel dos Santos

; Fuchs, Sandra C

; Alessi, Alexandre

; Lucena, Alexandre Jorge Gomes de

; Avezum, Alvaro

; Sousa, Ana Luiza Lima

; Pio-Abreu, Andrea

; Sposito, Andrei Carvalho

; Pierin, Angela Maria Geraldo

; Paiva, Annelise Machado Gomes de

; Spinelli, Antonio Carlos de Souza

; Nogueira, Armando da Rocha

; Dinamarco, Nelson

; Eibel, Bruna

; Forjaz, Cláudia Lúcia de Moraes

; Zanini, Claudia Regina de Oliveira

; Souza, Cristiane Bueno de

; Souza, Dilma do Socorro Moraes de

; Nilson, Eduardo Augusto Fernandes

; Costa, Elisa Franco de Assis

; Freitas, Elizabete Viana de

; Duarte, Elizabeth da Rosa

; Muxfeldt, Elizabeth Silaid

; Lima Júnior, Emilton

; Campana, Erika Maria Gonçalves

; Cesarino, Evandro José

; Marques, Fabiana

; Argenta, Fábio

; Consolim-Colombo, Fernanda Marciano

; Baptista, Fernanda Spadotto

; Almeida, Fernando Antonio de

; Borelli, Flávio Antonio de Oliveira

; Fuchs, Flávio Danni

; Plavnik, Frida Liane

; Salles, Gil Fernando

; Feitosa, Gilson Soares

; Silva, Giovanio Vieira da

; Guerra, Grazia Maria

; Moreno Júnior, Heitor

; Finimundi, Helius Carlos

; Back, Isabela de Carlos

; Oliveira Filho, João Bosco de

; Gemelli, João Roberto

; Mill, José Geraldo

; Ribeiro, José Marcio

; Lotaif, Leda A. Daud

; Costa, Lilian Soares da

; Magalhães, Lucélia Batista Neves Cunha

; Drager, Luciano Ferreira

; Martin, Luis Cuadrado

; Scala, Luiz César Nazário

; Almeida, Madson Q.

; Gowdak, Marcia Maria Godoy

; Klein, Marcia Regina Simas Torres

; Malachias, Marcus Vinícius Bolívar

; Kuschnir, Maria Cristina Caetano

; Pinheiro, Maria Eliete

; Borba, Mario Henrique Elesbão de

; Moreira Filho, Osni

; Passarelli Júnior, Oswaldo

; Coelho, Otavio Rizzi

; Vitorino, Priscila Valverde de Oliveira

; Ribeiro Junior, Renault Mattos

; Esporcatte, Roberto

; Franco, Roberto

; Pedrosa, Rodrigo

; Mulinari, Rogerio Andrade

; Paula, Rogério Baumgratz de

; Okawa, Rogério Toshiro Passos

; Rosa, Ronaldo Fernandes

; Amaral, Sandra Lia do

; Ferreira-Filho, Sebastião R.

; Kaiser, Sergio Emanuel

; Jardim, Thiago de Souza Veiga

; Guimarães, Vanildo

; Koch, Vera H.

; Oigman, Wille

; Nadruz, Wilson

Arquivos Brasileiros de Cardiologia

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mar 2021, Volume 116 N. 3 Pages 516 - 658

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

https://doi.org/10.36660/abc.20201238 10948 downloads

15.

Liga hipoeutética Al-11%Si: coeficiente de transferência de calor interfacial, variáveis térmicas, parâmetros microestruturais e microdureza
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Rodrigues, José Augusto França

; Santos Júnior, Gueber Elias Mendes

; Barros, André dos Santos

; Rocha, Otávio Fernandes Lima da

; Moreira, Antonio Luciano Seabra

Matéria (Rio de Janeiro)

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2021, Volume 26 N. 4 elocation e13064

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

RESUMO Este artigo apresenta um estudo teórico-experimental com o objetivo de determinar o coeficiente de transferência de calor interfacial, as variáveis térmicas de solidificação, os espaçamentos dendríticos primários e secundários bem como a microdureza Vickers da liga Al-11%Si solidificada direcionalmente, sob condições transientes de fluxo de calor, em um dispositivo de configuração horizontal refrigerado a água. Para o monitoramento dos perfis de temperatura utilizou-se um conjunto de termopares tipo K localizados em diferentes posições a partir da interface metal-molde, considerando a linha central correspondente ao eixo longitudinal do lingote. Uma técnica numérica, que compara perfis térmicos teóricos e experimentais, foi utilizada no cálculo do coeficiente de transferência de calor na interface metal/molde durante a solidificação cuja condição transiente é representada por uma equação analítica na forma de potência. Foram aplicadas técnicas experimentais para o cálculo das variáveis térmicas de solidificação, ou seja, deslocamento da frente de solidificação, velocidade da isoterma liquidus e taxa de resfriamento. Os resultados experimentais e simulados apresentaram uma concordância muito boa e possibilitaram estabelecer correlações analíticas entre tais variáveis térmicas e os espaçamentos dendríticos primários e secundários obtidos, por meio de equações na forma de potência representadas por expoentes característicos. Finalmente, são também apresentadas expressões experimentais capazes de correlacionar os valores dos espaçamentos dendríticos estudados com o comportamento da microdureza Vickers da referida liga.

ABSTRACT This paper presents a theoretical-experimental study aiming to determine the interfacial heat transfer coefficient and solidification thermal parameters from experimentally obtained data correlating these with the primary and secondary dendritic spacings as well as microhardness during the horizontal solidification of the Al-11wt.%Si alloy under transient heat flow conditions. For the experimental procedure, a water-cooled solidification device was used which allows the horizontal directional solidification and the monitoring of the temperature profiles in different positions from the metal-mold interface considering the center line corresponding to the longitudinal axis of the ingot. A numerical technique which compares theoretical and experimental thermal profiles has permitted the evaluation of the variation of metal-mold heat transfer coefficient along the solidification. The interfacial heat transfer coefficient of studied alloy is represented by a equation which show the time dependence during the process. The experimental and calculated values have shown a very good agreement. Experimental techniques were applied to calculate the following solidification thermal variables: solidification front displacement, growth rate and cooling rate. The experimental results allowed establishing a quantitative correlation between such thermal variables and the studied structural parameters by means of power type equations represented by characteristic exponents. Finally, correlation between the values of both primary and secondary dendritic spacings found with Vickers microhardness behavior for the studied alloy is also presented.

https://doi.org/10.1590/s1517-707620210004.1364

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issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

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