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Unravelling COVID-19 waves in Rio de Janeiro city:Qualitative insights from nonlinear dynamic analysis

Infectious Disease Modelling 2024年第2期9卷 314-328页

作者： Adriane S.Reis Laurita dos Santos américo cunha jr Thaís C.R.O.Konstantyner Elbert E.N.Macao Institute of Science and Technology Federal University of São PauloSão Josédos CamposSPBrazil Physics Institute University of São PauloSão PauloSPBrazil Scientific and Technological Institute Universidade BrasilSão PauloSPBrazil Department of Applied Mathematics Rio de Janeiro State UniversityRio de JaneiroRJBrazil Paulista School of Medicine Federal University of São PauloSão PauloSPBrazil

Since the COVID-19 pandemic was first reported in 2019,it has rapidly spread around the *** countries implemented several measures to try to control the virus *** healthcare system and consequently the general quality of life population in the cities have all been significantly impacted by the Coronavirus *** different waves of contagious were responsible for the increase in the number of cases that,unfortunately,many times lead to *** this paper,we aim to characterize the dynamics of the six waves of cases and deaths caused by COVID-19 in Rio de Janeiro city using techniques such as the Poincaréplot,approximate entropy,second-order difference plot,and central tendency *** results reveal that by examining the structure and patterns of the time series,using a set of non-linear techniques we can gain a better understanding of the role of multiple waves of COVID-19,also,we can identify underlying dynamics of disease spreading and extract meaningful information about the dynamical behavior of epidemiological time *** findings can help to closely approximate the dynamics of virus spread and obtain a correlation between the different stages of the disease,allowing us to identify and categorize the stages due to different virus variants that are reflected in the time series.

关键词： COVID-19 Nonlinear analysis Poincaréplot Central tendency measure

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Piezomagnetic vibration energy harvester with an amplifier

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Theoretical & Applied Mechanics Letters 2023年第6期13卷 481-483页

作者： João Pedro Norenberg americo cunha jr Piotr Wolszczak Grzegorz Litak Department of Mechanical Engineering São Paulo State UniversityIlha SolteiraSPBrazil Department of Applied Mathematics Rio de Janeiro State UniversityRio de JaneiroRJBrazil Department of Automation Lublin University of TechnologyLublinPoland

We study the effect of an amplification mechanism in a nonlinear vibration energy harvesting system where a ferromagnetic beam resonator is attached to the vibration source through an additional linear spring with a *** beam moves in the nonlinear double-well potential caused by interaction with two *** piezoelectric patches with electrodes attached to the electrical circuit support mechanical energy transduction into electrical *** results show that the additional spring can improve energy *** changing its stiffness,we observed various *** the point of the optimal stiffness of the additional spring,the power output is amplified a few times depending on the excitation amplitude.

关键词： Nonlinear energy harvesting Piezoelectric Displacement amplifier Bistable potential

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Relationship between angiotensin-(1-7) and angiotensin Ⅱ correlates with hemodynamic changes in human liver cirrhosis

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World Journal of Gastroenterology 2009年第20期15卷 2512-2519页

作者： Walkíria Wingester Vilas-Boas Antnio Ribeiro-Oliveira jr Regina Maria Pereira Renata da cunha Ribeiro Jerusa Almeida Ana Paula Nadu Ana Cristina Simoes e Silva Robson Augusto Souza dos Santos Laboratory of Hypertension Department of Physiology Biological Sciences institute Federal University of Minas Gerais Av. Antonio Carlos 6627 Belo Horizonte MG 31270-901 Brazil Laboratory of Endocrinology Department of Medicine Faculty of Medicine Federal University of Minas Gerais Av. Alfredo Balena 190 Belo Horizonte MG 30130-100 Brazil Hospitalar Foundation of the State of Minas Gerais FHEMIG Belo Horizonte MG Brazil Department of Pediatrics Faculty of Medicine Federal University of Minas Gerais Av.Alfredo Balena 190 Belo Horizonte MG 30130-100 Brazil

AIM： To measure circulating angiotensins at different stages of human cirrhosis and to further evaluate a possible relationship between renin angiotensin system （RAS） components and hemodynamic changes. METHODS： Patients were allocated into 4 groups： mild-to-moderate liver disease （MLD）, advanced liver disease （ALD）, patients undergoing liver transplantation, and healthy controls. Blood was collected to determine plasma renin activity （PRA）, angiotensin （Ang） Ⅰ, Ang Ⅱ, and Ang-（1-7） levels using radioimmunoassays. During liver transplantation, hemodynamic parameters were determined and blood was simultaneously obtained from the portal vein and radial artery in order to measure RAS components. RESULTS： PRA and angiotensins were elevated in ALD when compared to MLD and controls （P 〈 0.05）. In contrast, Ang Ⅱ was significantly reduced in MLD. Ang-（1-7）/Ang Ⅱ ratios were increased in MLD when compared to controls and ALD. During transplantation, Ang Ⅱ levels were lower and Ang-（1-7）/Ang Ⅱ ratios were higher in the splanchnic circulation than in the peripheral circulation （0.52 ± 0.08 vs 0.38 ±0.04, P 〈 0.02）, whereas the peripheral circulating Ang Ⅱ/Ang Ⅰ ratio was elevated in comparison to splanchnic levels （0.18 ±0.02 vs 0.13 ±0.02, P 〈 0.04）. Ang-（1-7）/ Ang Ⅱ ratios positively correlated with cardiac output （r = 0.66） and negatively correlated with systemic vascular resistance （r = -0.70）. CONCLUSION： Our findings suggest that the relationship between Ang-（1-7） and Ang Ⅱ may play a role in the hemodynamic changes of human cirrhosis.

关键词： Renin-angiotensin system Liver cirrhosis Angiotensin-(1-7) Angiotensin Ⅱ Splanchnic circulation Angiotensin converting enzyme 2

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Effect of propranolol on the splanchnic and peripheral renin angiotensin system in cirrhotic patients

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World Journal of Gastroenterology 2008年第44期14卷 6824-6830页

作者： Walkíria Wingester Vilas-Boas Antnio Ribeiro-Oliveira jr Renata da cunha Ribeiro Renata Lúcia Pereira Vieira Jerusa Almeida Ana Paula Nadu Ana Cristina Sim■es e Silva Robson Augusto Souza Santos Laboratório de Hipertenso Departamento de Fisiologia e BiofísicaICB-UFMGAv. Antonio Carlos6627Belo HorizonteMG31270-901Brazil Laboratório de Endocrinologia Departamento de Clínica MédicaFaculdade de Medicina-UFMGAv. Alfredo Balena190Belo HorizonteMG30130-100Brazil Departamento de Pediatria Faculdade de MedicinaUniversidade Federal de Minas Gerais (UFMG)Av. Alfredo Balena190Belo HorizonteMG30130-100Brazil

AIM:To evaluate the effect of β-blockade on angiotensins in the splanchnic and peripheral circulation of cirrhotic patients and also to compare hemodynamic parameters during liver transplantation according to propranolol pre-treatment or not. METHODS:Patients were allocated into two groups:outpatients with advanced liver disease(LD) and during liver transplantation(LT). Both groups were subdivided according to treatment with propranolol or not. Plasma was collected through peripheral venipuncture to determine plasma renin activity(PRA),Angiotensin(Ang) Ⅰ,Ang Ⅱ,and Ang-(1-7) levels by radioimmunoassay in LD group. During liver transplantation,hemodynamic parameters were determined and blood samples were obtained from the portal vein to measure renin angiotensin system(RAS) ***:PRA,Ang Ⅰ,Ang Ⅱ and Ang-(1-7) were signifi cantly lower in the portal vein and periphery in all subgroups treated with propranolol as compared to non-treated. The relationships between Ang-(1-7) and Ang Ⅰ levels and between Ang Ⅱ and Ang Ⅰ were significantly increased in LD group receiving propranolol. The ratio between Ang-(1-7) and Ang Ⅱ remained unchanged in splanchnic and peripheral circulation in patients under β-blockade,whereas the relationship between Ang Ⅱ and Ang Ⅰ was significantly increased in splanchnic circulation of LT patients treated with propranolol. During liver transplantation,cardiac output and index as well systemic vascular resistance and index were reduced in propranolol-treated subgroup. CONCLUSION:In LD group,propranolol treatment reduced RAS mediators,but did not change the ratio between Ang-(1-7) and Ang Ⅱ in splanchnic and peripheral circulation. Furthermore,the modification of hemodynamic parameters in propranolol treated patients was not associated with changes in the angiotensin ratio.

关键词： β-blockade Cirrhosis Renin angiotensinsystem Angiotensin-(1-7)

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New Approach to the Strain Analysis of Bragg Grating Sensors

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Photonic Sensors 2013年第1期3卷 74-80页

作者： José R. Alves da cunha Petrus Alcantara jr. Angela Santa BRJGIDA Gilvan BORGES Joāo Weyl COSTA Programa de Pós-Graduacāo em Fisica Universidade Federal do Pará Belém 66075-11 O Brazil Programa de Pós Graduacāo em Engenharia Elétrica Universidade Federal do Pará Belém 66075-11 O Brazil

The response of an optical strain sensor based on the fiber Bragg grating is theoretically analyzed with a different approach of that found usually in the literature. In this model, geometrical changes suffered by the grating itself are taken into account. The results are compared with those from experiments, showing very good agreement.

关键词： Bragg grating sensor strain sensor Bragg wavelength

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A Proof-of-Concept Assessment of the Safety and Efficacy of Intralesional Diclofenac in the Treatment of Cutaneous Neurofibromas

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International Journal of Clinical Medicine 2015年第12期6卷 975-983页

作者： Mauro Geller Aguinaldo Bonalumi Filho Lisa Oliveira Allan ERubenstein Luiz Guilherme Darrigo jr David Azulay Allan Bernacchi Marcia Goncalves Ribeiro Karin Soares Goncalves cunha Immunology Department Fundacao Educacional Serra dos Orgaos(UNIFESO)TeresopolisBrazil Clinical Immunology Instituto de Pos-Graduacao Medica Carlos Chagas(IPGMCC)Rio de JaneiroBrazil Medical Genetics Service IPPMG-Universidade Federal Rio de JaneiroRio de JaneiroBrazil Hospital Naval Marcilio Dias Rio de JaneiroBrazil Sociedade Evangelica Beneficiente de Curitiba Outpatient Unit CuritibaBrazil NYU Langone Medical Center New YorkNYUSA Bone Marrow Transplant Unit Hospital das Clinicas da Faculdade de Medicina de Ribeirao PretoUniversidade de Sao Paulo(USP)Ribeirao PretoBrazil Pontifica Universidade Catolica do Rio de Janeiro(PUC-RJ) Rio de JaneiroRJBrazil Plastic Surgery Post-Graduation PUC-RJRio de JaneiroBrazil 1 Universidade Federal Fluminense(UFF) Rio de JaneiroBrazil

The objectives of this study were to assess the safety and efficacy of intralesionally administered diclofenac in the treatment of cutaneous neurofibromas in patients with NF1. This was a proof-of-concept, prospective, safety and efficacy study of the effect of intralesionally administered diclofenac 25 mg/ml given once a week to 3 target cutaneous neurofibromas for 4 consecutive weeks. Overall, there was no significant change in neurofibroma size. During the study, some treated lesions developed signs of necrosis and fell off after a few weeks, but none of the control neurofibromas fell off. There were no significant changes in patient’s vital signs. A few adverse events occurred, mostly at the injection sites. During the study, some neurofibromas developed necrosis after the diclofenac injections and eventually detached from the patient. Overall, diclofenac was well tolerated, suggesting minimal systemic exposure, which required confirmation and further studies, including bioavailability analysis.

关键词： Neurofibromatosis Type 1 Cutaneous Neurofibromas Diclofenac Sodium

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