Parametric Study of a Plunging NACA0012 Airfoil

Natural flight has always been the source of imagination for  the  Human being, but reproducing the propulsive systems used by animals is indeed complex. New challenges in today’s society have made biomimetics gain a lot of momentum because of the high performance and versatility these systems possess when subjected to  the low Reynolds numbers effects. The main objective of the present work is the computational study of the influence of the Reynolds number, frequency and amplitude of the oscillatory movement of a NACA0012 airfoil in the aerodynamic performance for a constant angle of attack over time. The thrust and power coefficients are obtained which together are used to calculate the propulsive efficiency. The simulations were performed using ANSYS Fluent with a RANS approach for Reynolds numbers between 8,500 and 34,000, reduced frequencies between 1 and 5, and Strouhal numbers from 0.1 to 0.4. The aerodynamic parameters were widely explored as well as their interaction, obtaining optimal operational condition zones for the different Reynolds numbers studied. Keywords: Plunging, Airfoil, CFD, Aerodynamic coefficients, Biomimicr

Effect of Reynolds Number on a Plunging Airfoil

Biomimetics is an area of science that studies the development of new technologies, whose source of inspiration is Nature. Unlike traditional aircraft, animals only have one structure to create both lift and thrust, and for Humans, although in the recent years the studies in this area increased, a long way must be made to achieve their capability. The present paper focuses on the effect of the Reynolds number on the wake configuration produced by a plunging airfoil. The experimental work was performed using an airstream, that was marked with smoke, with an oscillating airfoil NACA0012, whose dimensions are 44cm and 10cm of span and aerodynamic chord, respectively. The motion prescribed for the wing is harmonic, since it very well represents the type of motion seen in Nature. Frequency and amplitude were maintained, respectively, at 1.2Hz and 2.8cm, and the wind speed range from 0.25m/s to 1.00m/s, which represents a nondimensional amplitude of 0.28, a reduced frequencies of 3.02, 1.51 and 0.75, and a Strouhal number and a Reynolds number range of, 0.07 – 0.27 and 1,500 – 6,300, respectively. Results indicate that, with the increase of the Reynolds number, the convection effects become more predominant than diffusion effects, the curvature of the wakes and the maximum effective angle of attack decrease, and time and configuration of vortex shedding change. For Re = 1,500, St = 0.27, another relevant conclusion appears; the interaction of the leading-edge vortex with the trailing-edge vortex indicates an improvement of the aerodynamic performance of this system. Keywords: Biomimetics, Plunging, Airfoil, Vortices, Wake

Sugar bislactones by one-step oxidative dimerisation with pyridinium chlorochromate versus regioselective oxidation of vicinal diols

Synthesis of 10-membered bislactones by PCC oxidation of methyl 2,6-di-O-pivaloyl-α-D-glucopyranoside and methyl 4,6-O-benzylidene-α-D-glucopyranoside is described, with emphasis on their structure elucidation using the information gained by combination of NMR spectroscopic techniques with X-ray diffraction data. In alternative, the use of PCC and PCC adsorbed on silica gel or alumina for the regioselective oxidation of vicinal diols in sugars is also reported. Both bislactones showed antifungal activity against Candida albicans, and were slightly active against the bacteria Bacillus subtilis. The bislactone presenting pivaloyl protecting groups also promoted some growth inhibition of Staphylococcus aureus.info:eu-repo/semantics/publishedVersio

Effects of Euterpe oleracea Mart. (AÇAÍ) extract in acute lung inflammation induced by cigarette smoke in the mouse

AbstractShort term inhalation of cigarette smoke (CS) induces significant lung inflammation due to an imbalance of oxidant/antioxidant mechanisms. Açai fruit (Euterpe oleracea) has significant antioxidant and anti-inflammatory actions. The present study aimed to determine whether oral administration of an açai stone extract (ASE) could reduce lung inflammation induced by CS. Thirty C57BL/6 mice were assigned to three groups (n=10 each): the Control+A group was exposed to ambient air and treated orally with ASE 300mg/kg/day; the CS group was exposed to smoke from 6 cigarettes per day for 5 days; and the CS+A group was exposed to smoke from 6 cigarettes per day for 5 days and treated orally with ASE (300mg/kg/day). On day 6, all mice were sacrificed. After bronchoalveolar lavage, the lungs were removed for histological and biochemical analyses. The CS group exhibited increases in alveolar macrophage (AMs) and neutrophil numbers (PMNs), myeloperoxidase (MPO), superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase activities (GPx), TNF-α expression, and nitrites levels in lung tissue when compared with the control ones (p<0.001 for all parameters). The AMs, PMNs, MPO, SOD, CAT, GPx and nitrite were significantly reduced by oral administration of ASE when compared with CS group (p<0.001 for all parameters, with exception of AMs p<0.01). The present results suggested that systemic administration of an ASE extract could reduce the inflammatory and oxidant actions of CS. Thus, the results of this study in mice should stimulate future studies on ASE as a potential agent to protect against CS-induced inflammation in humans

Doença Arterial Obstrutiva Periférica induzida em coelhos e suas repercussões na musculatura dos membros inferiores

Introdução: Com acúmulo subintimal de lipídios e materiais fibroso presentes na DAOP ocorre redução do fluxo sanguíneo e consecutivas anormalidades musculoesqueléticas e nervosas associadas, as quais geram as principais manifestações clinicas dos portadores, como: claudicação intermitente, dor isquêmica em repouso e em ultima estância gangrena que necessita de amputação. Objetivo: verificar as alterações que a doença arterial obstrutiva periférica causa na musculatura dos membros inferiores em coelhos, tendo em vista o melhor entendimento das alterações macroscópicas e microscópicas. Material e método: O estudo é do tipo experimental. Onde foram coletadas as amostras de 18 animais, que foram randomizados em dois grupos: G1 – grupo controle (apenas ração) e G2 (ração mais gema). Seguidamente à eutanásia foi removido parte do musculo sóleo, a partir de uma dissecção da face posterior da pata posterior esquerda.Com as amostras em mãos deu-se início a etapa de preparação das lâminas para análise histológica com fragmentos musculares, seguindo protocolos de rotina laboratorial. Resultado: A análise das lâminas histopatológicas revelou notáveis alterações morfológicas no tecido muscular, caracterizadas pelo aumento das células adiposas e atrofia muscular, além do desarranjo da arquitetura, no grupo alimentado com ração e gema (G2), em comparação com o grupo controle (G1) que recebeu exclusivamente ração. Esses achados destacam claramente os efeitos prejudiciais de uma dieta rica em lipídios na estrutura e função muscular. Conclusão: os resultados das lâminas histopatológicas confirmam o impacto negativo de uma dieta rica em lipídios na estrutura muscular, o que ressalta a importância de investigações adicionais para aprofundar nossa compreensão desses efeitos e seus possíveis desdobramentos clínicos

Práticas respeitosas realizadas por enfermeiras no período puerperal

Objective: To understand the respectful practices performed by nurses in the puerperal period.&nbsp; Métodos: trata-se de um estudo qualitativo feito por amostragem intencional com 11 enfermeiras que trabalhavam no alojamento conjunto de uma maternidade de alto risco. The data production occurred through semi-structured interviews. Bardin's content analysis was used to analyze the data, from which two thematic categories emerged: Respectful practices performed by nurses in the puerperium; and Facilities and challenges for respectful care of puerperae. Results: It was revealed that nurses have knowledge about respectful practices in the puerperium, understanding it as the qualified listening of the puerpera, the provision of physical and emotional support, providing holistic care and meeting the needs of the puerpera, highlighting the information as health promotion. However, there is a need to adjust the dimensioning of these professionals, work overload, lack of material resources and inputs, and disjointed work processes. Conclusion: It was evidenced that nurses use respectful practices of care for the puerperal woman and act in the assistance based on the precepts of humanization recommended by the Ministry of Health. The importance of the performance of trained, sensitive and articulate nurses who know how to work in teams and individually with the puerperal woman was identified.Esta pesquisa busca compreender as práticas respeitosas realizadas por enfermeiras no período puerperale trata-se de um estudo qualitativo feito por amostragem intencional com 11 enfermeiras que trabalhavam no alojamento conjunto de uma maternidade de alto risco. A produção dos dados ocorreu por meio de entrevista semiestruturada. Utilizou-se a análise de conteúdo de Bardin para a análise dos dados, da qual emergiram duas categorias temáticas: Práticas respeitosas realizadas por enfermeiras no puerpério; e Facilidades e desafios para o cuidado respeitoso de puérperas. Revelou-se que os enfermeiros têm conhecimento sobre as práticas respeitosas no puerpério, compreendendo-a como a escuta qualificada da puérpera, o dispor de um suporte físico e emocional, o prestar um cuidado holístico e o atendimento das necessidades da puérpera evidenciando a informação como promoção da saúde. Porém, há uma necessidade de adequação do dimensionamento desses profissionais, sobrecarga de trabalho, falta de recursos materiais e insumos e processos de trabalho desarticulados. Evidenciou-se, também, que os enfermeiros utilizam práticas respeitosas de cuidado à puérpera e atuam na assistência com base nos preceitos da humanização preconizadas pelo Ministério da Saúde. Identificou-se a importância da atuação de enfermeiros capacitados, sensíveis e articulados, que saibam trabalhar em equipe e individualmente com a puérpera

Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics

A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN

TheoFrameAccountability: apresentação de resultados: seminário final

Sem resumo disponível.publishe