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ABSTRACT Clinical data: Infant, nine months of age, female, diagnosed with congenital heart disease, with signs of heart failure associated with cyanosis and difficulty in gaining weight. Chest radiography: Cardiomegaly with prevalence of pulmonary vascular network. Electrocardiogram: Ectopic atrial rhythm with right ventricular overload and left anterosuperior divisional block. Echocardiogram: Single atrium with absent interatrial septum, atrioventricular connection with a single valve and two orifices, with increased pulmonary pressure and high Qp/Qs. Computed tomography: Absence of portal vein and intrahepatic segment of the inferior vena cava. Infrahepatic portion continuing with the azygos system at the level of the thoracic cavity, presence of mesenteric-caval communication associated with signs suggestive of hepatic peribiliary fibrosis. Diagnosis: Abernethy malformation is a rare condition and represents an extrahepatic portosystemic shunt that develops between the mesenteric-portal vasculature and the systemic veins. It may be associated with cardiac malformations and advance with pulmonary hypertension and even the need for liver transplantation. Persistent cyanosis after corrective surgery led to a deeper investigation and correct diagnosis of this malformation. Operation: Sternotomy with 68 minutes of cardiopulmonary bypass and nine minutes of total circulatory arrest. In the postoperative period, persistence of cyanosis was evident, even though there were no immediate complications. Patient was discharged on the 10th postoperative day. An abdominal computed tomography angiography confirmed the diagnosis of Abernethy type I malformation, and the patient was transferred for liver transplantation after congenital heart disease treatment.

https://doi.org/10.21470/1678-9741-2022-0110

Use of Ozonized Water in the Prevention of Surgical Site Infection in Children Undergoing Cardiovascular Surgery
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Murakami, Alexandre Noboru

; Croti, Ulisses Alexandre

; Borim, Bruna Cury

; Marchi, Carlos Henrique De

; Murakami, Rouse Mary Rossini

; Almeida, Margarete Teresa Gottardo de

; Policarpo, Rafael da Silva

; Avona, Fabiana Nakamura

; Godoy, Moacir Fernandes de

Brazilian Journal of Cardiovascular Surgery

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2023, Volume 38 Nº 6 elocation e20230006

Resumo: En | Texto: En | PDF: En

ABSTRACT Introduction: Since the reduction of healthcare-associated infections has been a focus for quality patient care, this study aimed to evaluate the surgical site infection rate of children who underwent cardiovascular surgery after implementation of ozonized water system for hand and body hygiene allied to previously implemented preventive measures. Methods: Two uniformly comparable groups of pediatric patients underwent cardiovascular surgery. Group A (187) patients were operated prior to installation of ozonized water system (March 1 to August 31, 2019), and group B (214) patients were operated after installation of ozonized water system (October 1, 2019, to March 31, 2020). Ozonized water was used for professional hand hygiene and patient body hygiene. Results: There was statistical significance for surgical site infection reduction in group B (P=0.0289), with a relative risk of 0.560 (95% confidence interval = 0.298 to 0.920), inferring the risk of being diagnosed with surgical site infections in group B was 44% less than in group A. There was no statistical significance regarding mechanical ventilation time (P=0.1998) or mortality (P=0.4457). Conclusion: Ozonized water for professional hand hygiene and patient body hygiene was an adjuvant combined with traditional preventive methods to reduce the risk of surgical site infection, although no impact on hospital stay or mortality was observed.

https://doi.org/10.21470/1678-9741-2023-0006

Soluções analítica e numérica para o movimento vertical de um minifoguete
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Alves, André Luíz

; Bento, Sérgio Souza

; Marchi, Carlos Henrique

Revista Brasileira de Ensino de Física

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2023, Volume 45 elocation e20230229

Resumo: En Pt | Texto: En Pt | PDF: En | PDF: Pt

In this work, a model for the analytical solution of the differential equation of motion of a model rocket that describes a vertical trajectory in an upward movement is described. The solutions for velocity, v(t), and altitude, y(t), are compared with a numerical solution using Euler’s method. To test these models and compare the methods for obtaining v(t) and y(t), the experimental flight of the Epsilon-8 model rocket, with a solid propellant engine, from the Carl Sagan rocketry group of the Federal University of Paraná (UFPR). In the analytical solution, an approximate model is considered in which the total mass of the mini rocket is constant during the propellant burn time. Numerical and analytical predictions for v(t) and y(t) can be obtained, using physical parameters related to the mini rocket, the drag force and the experimental curves for the thrust, T(t). T(t) curves of four engines manufactured by the Carl Sagan group were used, similar to the one used in the experimental flight of the Epsilon-8. Although the analytical method is satisfactory, the numerical method returns values of speed and altitudes closer to the experimental flight of the Epsilon-8.

Neste trabalho é descrito um modelo para a solução analítica da equação diferencial de movimento de um minifoguete que descreve uma trajetória vertical num movimento de subida. As soluções para a velocidade, v(t), e altitude, y(t), são comparadas com uma solução numérica utilizando o método de Euler. Para testar estes modelos e comparar os métodos para a obtenção de v(t) e y(t), foi utilizado o voo experimental do minifoguete Epsilon-8 com motor a propelente sólido, do grupo de foguetemodelismo Carl Sagan da Universidade Federal do Paraná (UFPR). Na solução analítica é considerado um modelo aproximado no qual a massa total do minifoguete é constante durante o tempo de queima do propelente. As previsões numérica e analítica para v(t) e y(t) podem ser obtidas utilizando parâmetros físicos relacionados ao minifoguete: as curvas experimentais para o empuxo, T(t), e a força de arrasto. Foram utilizadas curvas T(t) de quatro motores fabricados pela empresa Boa Vista Modelismo e testados pelo grupo de Carl Sagan, que são do mesmo lote do motor usado no voo experimental do Epsilon-8. Embora o método analítico seja satisfatório, o método numérico retorna valores de velocidade e altitudes mais próximos ao voo experimental do Epsilon-8.

https://doi.org/10.1590/1806-9126-rbef-2023-0229

Pediatric Heart Transplant: Initial Experience in a Tertiary Center in Brazil
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Cajueiro, Francisco Candido Monteiro

; Croti, Ulisses Alexandre

; Barufi, Alexandra Regina Siscar

; Bodini, André Luís de Andrade

; Postigo, Karolyne Barroca Sanches

; Marchi, Carlos Henrique De

; Santos, Fernando Cesar Gimenes Barbosa

; Beani, Lilian

; Borim, Bruna Cury

; Godoy, Moacir Fernandes

; Moscardini, Airton Camacho

Brazilian Journal of Cardiovascular Surgery

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Jun 2022, Volume 37 Nº 3 Páginas 281 - 291

Resumo: En | Texto: En | PDF: En

ABSTRACT Introduction: Pediatric heart transplantation is the definitive therapy for children with end-stage heart failure. This paper describes our initial experience in pediatric heart transplantation in a tertiary center in Brazil Methods: This is a historical prospective descriptive cohort study based on a review of the medical records of children undergoing heart transplantation at Hospital de Base and Hospital da Criança e Maternidade de São José do Rio Preto. Variables were displayed as frequency, mean, or median. Statistical analysis and Kaplan-Meier actuarial curve were obtained with the aid of Microsoft® Excel® 2019 and STATSDirect version 3.3.5. Results: Between January 2010 and December 2020, ten children underwent bicaval orthotopic heart transplantation, 30% of which were under one year of age. Nine patients had end-stage heart failure (International Society for Heart and Lung Transplantation-Heart Failure D) and 50% of the recipients were transplanted under conditions of progressive clinical deterioration (Interagency Registry for Mechanically Assisted Circulatory Support ≤ 2). Forty percent of the recipients had a panel-reactive antibody > 20% on virtual crossmatch. In the postoperative period, 80% of patients required high dose of inotropic support (vasoactive-inotropic score > 10) for > 48 hours. The death-free survival rate at 131 months was 77.1±14.4%. Most patients (88.9%) in late follow-up had an episode of active cytomegalovirus infection. Cellular rejection, with or without clinical repercussion, was present in 44.4% of the patients. Conclusion: Pediatric heart transplantation produces acceptable and feasible outcomes as definitive therapy for children with end-stage heart failure.

https://doi.org/10.21470/1678-9741-2021-0483

Common Arterial Trunk with Interrupted Aortic Arch
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Estephan, Lys Molina Hernandes

; Aranda, Aline Simões

; Marchi, Carlos Henrique De

; Croti, Ulisses Alexandre

Brazilian Journal of Cardiovascular Surgery

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Fev 2022, Volume 37 Nº 1 Páginas 131 - 134

Resumo: En | Texto: En | PDF: En

Abstract Clinical data: Patient diagnosed with common arterial trunk, submitted to pulmonary artery banding in another center and lost to clinical follow-up. Referred to our center at four years old, extremely cyanotic. Chest radiography: Cardiomegaly; attenuated peripheral vascular markings. Electrocardiography: Right ventricular hypertrophy. Echocardiography: Common arterial trunk, but it was not possible to analyze all the structures. Computed tomography angiography: Van Praagh type A4 common arterial trunk. Extremely hypoplastic right and left pulmonary arteries. Diagnosis: Association of aortic arch interruption type A is uncommon and should be considered. Operation: Debanding of pulmonary arteries allowing for possible future complete repair.

https://doi.org/10.21470/1678-9741-2021-0008

Abernethy Malformation: Possible Diagnosis for Patients with Congenital Heart Disease and Persistent Cyanosis
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Brun, Marilia Maroneze

; Cardoso, Mariana Rodero

; Borim, Bruna Cury

; Marchi, Carlos Henrique De

; Croti, Ulisses Alexandre

Brazilian Journal of Cardiovascular Surgery

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2022, Nº ahead

Resumo: En | Texto: En | PDF: En

https://doi.org/10.21470/1678-9741-2022-0110

COVID-19 in the Perioperative Period of Cardiovascular Surgery: the Brazilian Experience
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Gomes, Walter J.

; Rocco, Isadora

; Pimentel, Wallace S.

; Pinheiro, Aislan H. B.

; Souza, Paulo M. S.

; Costa, Luiz A. A.

; Teixeira, Marjory M. P.

; Ohashi, Leonardo P.

; Bublitz, Caroline

; Begot, Isis

; Moreira, Rita Simone L

; Hossne Jr, Nelson A.

; Vargas, Guilherme F.

; Branco, João Nelson R.

; Teles, Carlos A.

; Medeiros, Eduardo A. S.

; Sáfadi, Camila

; Rampinelli, Amândio

; Moratelli Neto, Leopoldo

; Rosado, Anderson Rosa

; Mesacasa, Franciele Kuhn

; Capriata, Ismael Escobar

; Segalote, Rodrigo Coelho

; Palmieri, Deborah Louize da Rocha Vianna

; Jardim, Amanda Cristina Mendes

; Vianna, Diego Sarty

; Coutinho, Joaquim Henrique de Souza Aguiar

; Jazbik, João Carlos

; Coutinho, Henrique Madureira da Rocha

; Kikuta, Gustavo

; Almeida, Zely Sant'Anna Marotti de

; Feguri, Gibran Roder

; Lima, Paulo Ruiz Lucio de

; Franco, Anna Carolina

; Borges, Danilo de Cerqueira

; Cruz, Felipe Ramos Honorato De La

; Croti, Ulisses Alexandre

; Borim, Bruna Cury

; Marchi, Carlos Henrique De

; Goraieb, Lilian

; Postigo, Karolyne Barroca Sanches

; Jucá, Fabiano Gonçalves

; Oliveira, Fátima Rosane de Almeida

; Souza, Rafael Bezerra de

; Zilli, Alexandre Cabral

; Mas, Raul Gaston Sanchez

; Bettiati Junior, Luiz Carlos

; Tranchesi, Ricardo

; Bertini Jr, Ayrton

; Franco, Leandro Vieira

; Fernandes, Priscila

; Oliveira, Fabiana

; Moraes Jr, Roberto

; Araújo, Thiago Cavalcanti Vila Nova de

; Braga, Otávio Penna

; Pedrosa Sobrinho, Antônio Cavalcanti

; Teixeira, Roberta Tavares Barreto

; Camboim, Irla Lavor Lucena

; Gomes, Eduardo Nascimento

; Reis, Pedro Horigushi

; Garcia, Luara Piovan

; Scorsioni, Nelson Henrique Goes

; Lago, Roberto

; Guizilini, Solange

Brazilian Journal of Cardiovascular Surgery

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Dez 2021, Volume 36 Nº 6 Páginas 725 - 735

Resumo: En | Texto: En | PDF: En

Abstract Introduction: We investigated the clinical course and outcomes of patients submitted to cardiovascular surgery in Brazil and who had developed symptoms/signs of coronavirus disease 2019 (COVID-19) in the perioperative period. Methods: A retrospective multicenter study including 104 patients who were allocated in three groups according to time of positive real time reverse transcriptase-polymerase chain reaction (RT-PCR) for the SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2): group 1, patients who underwent cardiac surgery > 10 days after positive RT-PCR; group 2, patients with a positive RT-PCR within 10 days before or after surgery; group 3, patients who presented positive RT-PCR > 10 days after surgery. The primary outcome was mortality and secondary outcomes were postoperative complications, intensive care unit (ICU) length of stay, and postoperative days of hospitalization. Results: The three groups were similar with respect to age, the European System of Cardiac Operative Risk Evaluation score, and comorbidities, except hypertension. Postoperative complications and death were significantly higher in groups 2 and 3 than in group 1, and no significant difference between groups 2 and 3 was seen. Group 2 showed a high prevalence of surgery performed as an urgent procedure. Although no significant differences were observed in ICU length of stay, total postoperative hospitalization time was significantly higher in group 3 than in groups 1 and 2. Conclusion: COVID-19 affecting the postoperative period of patients who underwent cardiovascular surgery is associated with a higher rate of morbidity and mortality. Delaying procedures in RT-PCR-positive patients may help reduce risks of perioperative complications and death.

https://doi.org/10.21470/1678-9741-2021-0960

Isolated Coarctation Repair in Neonates and Infants Through Left Thoracotomy: Short-Term Outcomes
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Murakami, Alexandre Noboru

; Croti, Ulisses Alexandre

; Cajueiro, Francisco Candido Monteiro

; Arteaga, Grace

; Pike, Roxann Barnes

; Moscardini, Airton Camacho

; Marchi, Carlos Henrique De

; Cardoso, Mariana Ribeiro Rodero

; Santos, Fernando Cesar Gimenes Barbosa

; Borim, Bruna Cury

Brazilian Journal of Cardiovascular Surgery

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Ago 2021, Volume 36 Nº 4 Páginas 461 - 467

Resumo: En | Texto: En | PDF: En

Abstract Introduction: End-to-end anastomosis and extended end-to-end anastomosis are typically used as surgical approaches to coarctation of the aorta (CoAo) with access at the subclavian artery or an interposition graft. The objective of this study is to analyze the impact of surgical and anatomical characteristics and techniques on early outcomes after surgical treatment of CoAo without cardiopulmonary bypass through left thoracotomy. Methods: This is a quantitative, observational, and cross-sectional analysis of patients who underwent repair of CoAo between July 1, 2010 and December 31, 2017. Seventy-two patients were divided into three groups according to age: 34 in group A (≤ 30 days), 24 in group B (31 days to one year), and 14 in group C (≥ 1 year to 18 years). Results: Aortic arch hypoplasia was associated in 30.8% of the cases, followed by ventricular septal defect (13.2%). The preductal location was more frequent in group A (73.5%), ductal in group B (41.7%), and postductal in group C (71.4%). Long coarcted segment was predominant in groups A and C (61.8% and 71.4%, respectively) and localized in group B (58.3%). Extended end-to-end anastomosis technique was prevalent (68%), mainly in group A (91.2%). Mortality in 30 days was 1.4%. Conclusion: Most of the patients were children under one year of age, and extended end-to-end anastomosis was the most used technique, secondary to arch hypoplasia. Further, overall mortality was low in spite of moderate morbidity in the first 30 postoperative days.

https://doi.org/10.21470/1678-9741-2020-0554

Movimento Vertical de Minifoguetes: Equações de Trajetórias e Análises Gráficas
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Alves, André Luíz

; Bento, Sérgio Souza

; Marchi, Carlos Henrique

Revista Brasileira de Ensino de Física

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2021, Volume 43 elocation e20200479

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Neste trabalho são descritas as equações diferenciais de movimento e as respectivas soluções para a velocidade [v(t)] e altitude [y(t)] em função do tempo, relativas a um foguete que segue uma trajetória vertical em um movimento de subida. São considerados quatro modelos: no primeiro é desprezada a força de arrasto do ar; no segundo é considerada uma força de arrasto linear com a velocidade; no terceiro e quarto modelos é considerado que a força de arrasto é proporcional ao quadrado da velocidade. O terceiro modelo se distingue por considerar a massa total de um foguete constante. No quarto modelo, apresenta-se uma solução completa, considerando-se que a massa decresce linearmente com o tempo durante a exaustão de gases. Para testar estes modelos foi utilizado o voo experimental do minifoguete Epsilon-8 do Grupo de Foguetes Carl Sagan da UFPR. Foram utilizados parâmetros experimentais relacionados à curva de empuxo em função do tempo (teste estático) do Epsilon-8 que permitiram estimar a velocidade de exaustão dos gases expelidos do motor. As curvas teóricas para v(t) e y(t) do terceiro e quarto modelos, por serem mais completos, foram utilizados no ajuste das respectivas curvas experimentais do Epsilon-8. O terceiro modelo, embora tenha uma solução aproximada, é razoável na previsão do apogeu, com um erro de 8,6%. O quarto modelo, por ser o mais completo, prevê o apogeu com um erro de apenas 1,5%.

This work describes the differential equations of motion and the respective solutions for speed v(t) and altitude y(t) as a function of time, relative to a rocket that follows a vertical trajectory in an upward motion were described. Four models are considered: in the first, the drag force of the air is neglected; in the second it is considered a linear drag force with speed; in the third and fourth models it is considered that the drag force is proportional to the square of the speed. The third model is distinguished by considering the total mass of a rocket constant. In the fourth model, a complete solution is presented, considering that the mass decreases linearly with time. To test these models, the experimental flight of the Epsilon-8 model rocket from the UFPR Carl Sagan Rocket Group was used. Experimental parameters related to the thrust curve as a function of the Epsilon-8 time (static test) were used, in which from the model rocket mass variation rate it was possible to obtain the rate of exhaust of the gases expelled in the engine. The third and fourth models, since they are more realistic, were used to adjust the experimental curve for v(t) and y(t). The third model, although it has an approximate solution, proves to be reasonable in the prediction of the peak, with an error of 8.6%. The fourth model, being the most complete, predicts the peak with an error of only 1.5% precisely in the time of the experimental peak.

https://doi.org/10.1590/1806-9126-rbef-2020-0479 628 downloads

10.

Minifoguete a propelente sólido: aspectos teóricos e propostas experimentais para o ensino de física
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Alves, André Luíz

; Paneto, Anderson Nunes

; Littike, Kaio Alan

; Bento, Sérgio Souza

; Marchi, Carlos Henrique

Revista Brasileira de Ensino de Física

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2020, Volume 42 elocation e20200390

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

Neste trabalho foi construído um minifoguete a propelente sólido como uma proposta de atividade lúdica, no qual os estudantes podem aprender física, matemática e simulação computacional na prática. Foi realizado toda uma abordagem teórica sobre grandezas físicas que surgem na equação de movimento e termodinâmica do minifoguete. A velocidade de exaustão e a constante de arraste puderam ser determinadas com a equação de altura em função do tempo do minifoguete, utilizando um altímetro digital. Estas grandezas foram comparadas com seus respectivos valores teóricos confrontando experiência e teoria. Na parte de construção, foram mostradas todas as etapas, desde a preparação do combustível até o minifoguete pronto para lançamento em uma base. Aqui o estudante tem a oportunidade de entender o funcionamento de um foguete real a propelente sólido, visto que a diferença deste para um minifoguete é apenas a escala.

In this work, a solid propellant model rocket was built as a proposal for a playful activity, in which students can learn physics, mathematics and computer simulation in practice. A whole theoretical approach was carried out on physical quantities that appear in the model rocket and thermodynamic equation. The rate of exhaustion and the variation in mass with time which appear in the impulse formula of the model rocket, could be determined with the equation of altitude as a function of time using a digital altimeter. These quantities were compared with theoretical values comparing experience and theory. In the construction part, all steps were shown, from the preparation of the fuel, to the model rocket ready to launch on a base. Here the student has the opportunity to understand how a real rocket works with solid propellant, since the difference between this and a model rocket is only the scale.

https://doi.org/10.1590/1806-9126-rbef-2020-0390 1716 downloads

11.

Rare Association Between Atrioventricular Septal Defect and Partial Anomalous Pulmonary Venous Connection
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Murakami, Alexandre Noboru

; Baston, Gabriela Guimarães

; Cardoso, Mariana Ribeiro Rodero

; Marchi, Carlos Henrique De

; Croti, Ulisses Alexandre

Brazilian Journal of Cardiovascular Surgery

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Dez 2019, Volume 34 Nº 6 Páginas 765 - 768

Resumo: En | Texto: En | PDF: En

Abstract Clinical data: Infant, 7 months, female, referred to our department at one month of age, suspecting of congenital heart disease for further investigation. Chest radiography: Demonstrates cardiomegaly and prominent pulmonary vascular markings. Electrocardiography: Shows right ventricular hypertrophy and left anterior fascicular block. Echocardiography: Evidenced common atrioventricular valve with two orifices and the left superior pulmonary vein draining on the brachiocephalic vein. Computed tomography angiography: This complementary imaging exam was performed to confirm the diagnosis. Diagnosis: The patient presented an association between AVSD and PAPVC, a rare combination. The clinical picture of heart failure was preponderant, characterized by need for diuretics and complementary exams findings, and early surgical treatment was indicated. Operation: The operation was performed through a median sternotomy with 123 minutes of cardiopulmonary bypass and 89 minutes of cross-clamping time. The patient had no postoperative complications, remaining 10 days hospitalized.

https://doi.org/10.21470/1678-9741-2019-0203 291 downloads

12.

The Rare Association of Tetralogy of Fallot and ALCAPA
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Murakami, Alexandre Noboru

; Baston, Gabriela Guimarães

; Cardoso, Mariana Ribeiro Rodero

; Marchi, Carlos Henrique de

; Croti, Ulisses Alexandre

Brazilian Journal of Cardiovascular Surgery

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Out 2019, Volume 34 Nº 5 Páginas 624 - 626

Resumo: En | Texto: En | PDF: En

https://doi.org/10.21470/1678-9741-2019-0139 250 downloads

13.

Surgical Treatment for Congenital Heart Defects in Down Syndrome Patients
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Santos, Fernando Cesar Gimenes Barbosa

; Croti, Ulisses Alexandre

; Marchi, Carlos Henrique De

; Murakami, Alexandre Noboru

; Brachine, Juliana Dane Pereira

; Borim, Bruna Cury

; Finoti, Renata Geron

; Godoy, Moacir Fernandes de

Brazilian Journal of Cardiovascular Surgery

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Fev 2019, Volume 34 Nº 1 Páginas 1 - 7

Resumo: En | Texto: En | PDF: En

Abstract Objective: To analyze data related to surgical treatment in patients with congenital heart defects (CHD) and Down syndrome (DS) based on information from International Quality Improvement Collaborative Database for Congenital Heart Disease (IQIC). Methods: Between July 1, 2010 and December 31, 2017, 139 patients with CHD and DS underwent surgery at Hospital de Base and Hospital da Criança e Maternidade de São José do Rio Preto (FUNFARME)/Faculdade de Medicina de São José do Rio Preto - SP (FAMERP). A quantitative, observational and cross-sectional study was performed in which the pre, intra and postoperative data were analyzed in an IQIC database. The data included gender, age, prematurity, weight, preoperative procedures, diagnosis, associated cardiac and non-cardiac anomalies, Risk Adjustment for Congenital Heart Surgery (RACHS-1), type of surgery, cardiopulmonary bypass (CPB), perfusion time, aortic clamping time and CPB temperature, bacterial sepsis, surgical site infection and other infections, length of stay in intensive care unit (ICU), length of hospital stay and in-hospital mortality. Results: The most prevalent procedures were complete atrioventricular septal defect repair (58 - 39.45%), followed by closure of ventricular septal defect (36 - 24.49%). The RACHS-1 categories 1, 2, 3 and 4 were distributed as 22 (15%); 49 (33.3%); 72 (49%) and 4 (2.7%), respectively. There were no procedures classified as categories 5 or 6. Bacterial sepsis occurred in 10.2% of cases, surgical site infection in 6.1%, other infections in 14.3%. The median length of ICU stay was 5 days and the median length of hospital stay was 11 days. In-hospital mortality was 6.8%. Conclusion: Surgical treatment in patients with CHD and DS usually does not require highly complex surgical procedures, but are affected by infectious complications, resulting in a longer ICU and hospital length of stay with considerable mortality.

https://doi.org/10.21470/1678-9741-2018-0358 1370 downloads

14.

Phosphate Sources and Filter Cake Amendment Affecting Sugarcane Yield and Soil Phosphorus Fractions
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Soltangheisi, Amin

; Santos, Valdevan Rosendo dos

; Franco, Henrique Coutinho Junqueira

; Kolln, Oriel

; Vitti, André Cesar

; Dias, Carlos Tadeu dos Santos

; Herrera, Wilfrand Ferney Bejarano

; Rodrigues, Marcos

; Soares, Thais de Marchi

; Withers, Paul John Anthony

; Pavinato, Paulo Sergio

Revista Brasileira de Ciência do Solo

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2019, Volume 43 elocation e0180227

Resumo: En | Texto: En | PDF: En

ABSTRACT: The use of mineral phosphate fertilizers associated with organic residues can improve fertilizer use efficiency and consequently decrease their usage costs. Soil application of filter cake (FC) can provide nutrients and enhance physical quality. This study aimed to evaluate the effects of different phosphate fertilizers [rock phosphate (RP) and triple superphosphate (TSP)] applied at different rates (90 and 180 kg ha-1 P2O5) associated with filter cake (10 Mg ha-1 dry matter) on the soil phosphorus (P) fractions after two consecutive seasons of sugarcane in two distinct soils, sandy and clayey. Yield was significantly improved with FC addition in the first year in both soils, while inorganic P sources did not influence crop yield at either location and in both years. Organic and residual P forms were only slightly altered in the sandy soil. The most significant changes occurred in the labile and moderately labile P fractions in both soils. Filter cake was an effective source of nutrients for plant development, increasing the levels of soil available P and keeping it at agronomically adequate levels for up to two years, however it was not able to facilitate the P release from mineral fertilizers, irrespective of the source or rate.

https://doi.org/10.1590/18069657rbcs20180227 1901 downloads

15.

Theoretical and Experimental Heat Transfer in Solid Propellant Rocket Engine
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Vicentin, Izabel Cecilia Ferreira de Souza

; Marchi, Carlos Henrique

; Foltran, Antonio Carlos

; Moro, Diego

; Silva, Nicholas Dicati Pereira da

; Campos, Marcos Carvalho

; Araki, Luciano Kiyoshi

; Diógenes, Alysson Nunes

Journal of Aerospace Technology and Management

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2019, Volume 11 elocation e3819

Resumo: En | Texto: En | PDF: En

ABSTRACT: Accurate determination of heat flux is an important task not only in the designing aspect, but also in the performance analysis of rocket engines. In this purpose, this work deals with the heat flux determination in a combustion chamber through the inverse method. In this approach, the transient heat flux is determined from the experimental temperature data measured at the outer sidewall of the rocket engine. In this work the physical phenomenon was modeled by the transient one-dimensional heat equation in cylindrical coordinates and the material properties of the chamber were considered constant. Furthermore, the model is solved using the inverse heat conduction problem with least squares modified by the addition of Tikhonov regularization term of zero-order. Moreover, the sensitivity coefficients were obtained by Duhamel’s theorem. Through the regularization parameter, it was able to generate acceptable results even when using data with considerable experimental errors.

https://doi.org/10.5028/jatm.v11.1066 2738 downloads

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