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Comparison of Mathematical Methods to Obtain Concentration and Temperature of Newtonian Fluids in Tubular Reactors  [PDF]
Diego Alves de Miranda, Renato Cristofolini, Emerson José Corazza, Gilson Joao dos Santos, Claiton Emilio do Amaral
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104329
Abstract:
In several areas of engineering, it is possible to put real problems in mathematical functions; when we represent a problem with variables in the form of function, we were able to extract various information from it. This paper compared two different mathematical methods, being the finite difference method and the Fourth Order Range-Kutta method, to analyze the concentration and temperature of the water flow inside a tubular reactor. These results were compared with the analytical and experimental results of the problem, demonstrating that the Fourth Order Range-Kutta method was more advantageous than the finite difference method.
Atributos químicos de solos sob diferentes usos em perímetro irrigado no semiárido de Pernambuco
Corrêa, Rossini Mattos;Freire, Maria Betania Galv?o dos Santos;Ferreira, Rinaldo Luiz Caraciolo;Freire, Fernando José;Pessoa, Luiz Guilherme Medeiros;Miranda, Marcelo Alves;Melo, Diego Vandeval Maranh?o de;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000200008
Abstract: soils developed at semi-arid climate can present salt accumulation, which compromise the agricultural use, being increased by inadequate irrigation management. based on the use, the degradation of these soils can occur at higher or smaller intensity. this study aimed to evaluate the effect of soil uses based on physical and chemical properties of an irrigated area in the semi-arid region of northeastern brazil. the soil uses were annual crops (c), fruticulture (f), pasture (p), discarded lands (d), or native vegetation (v). disturbed soil samples were collected from the 0-10, 10-30 and 30-60 cm layers for chemical analysis, and undisturbed samples from the first two layers for soil density analysis. the indicators ph and electrical conductivity of the saturation extract, soil ph, available phosphorus, total organic carbon, exchangeable cations, calcium, magnesium, potassium, and sodium, cation exchange capacity, sum of bases, base saturation percentage, percentage of exchangeable sodium, and carbon stocks were subjected to multivariate analysis by principal component analysis, and clustering by the tocher method. the soil chemical properties under production systems was different from v; the chemical quality of the production systems c and d, and that of c and p was similar. for the uses c, d, p, and f, the values of the soil properties (ph, ph and electrical conductivity of the saturation extract, exchangeable calcium and magnesium, sum of bases, base saturation and available phosphorus) was higher than for v in the three analyzed layers. the highest total organic carbon content was observed under f and p. the electrical conductivity of the saturation extract was higher under c, d and p than under f and v, indicating the beginning of a soil salinization process, thus characterizing them as less sustainable land uses.
Actinic Cheilitis: Clinical Characteristics Observed in 75 Patients and a Summary of the Literature of This Often Neglected Premalignant Disorder  [PDF]
Ana Maria de Oliveira Miranda, Thiago de Miranda Ferrari, Taiana Campos Leite, Karin Soares Gon?alves Cunha, Eliane Pedra Dias
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.521171
Abstract: Actinic cheilitis can progress to squamous cell carcinoma in 20% of cases. The purpose of this study was to identify the clinical characteristics of 75 patients with actinic cheilitis and to summarise the current literature concerning actinic cheilitis. A total of 75 patients were evaluated over a 3-year period. The medical history, physical examination results and images were collected from each patient. Demographic data were collected and analysed. To review the literature, the relevant data were collected from scientific journals in the last 30 years. The mean age of the patients was 56 years old; 42 patients (56%) were female, and 66 patients (88%) were white. Nineteen (25.3%) patients reported at least one symptom, including pain, burning and itching. Sixty-five (86.7%) patients presented actinic cheilitis only in the lower lip. All of the patients reported sun exposure, and 44 (58.6%) patients were exposed for more than 10 years. The main clinical aspects investigated and analysed included dryness (100%), flaking (72%) and white lesions (57.3%). Lip assessment is extremely important in medical and dental care. From the 15 lesions assessed in the presence of actinic cheilitis, the most common clinical characteristics observed were dryness, flaking and white lesions. It is imperative to know the clinical aspects that may be encountered in actinic cheilitis in order to achieve early diagnosis, thus avoiding lip squamous cell carcinoma transformation.
Análise da estrutura de comunidades arbóreas de uma floresta amaz?nica de Terra Firme aplicada ao manejo florestal
Alves, Jo?o Carlos Zenaide Oliveira;Miranda, Izildinha de Souza;
Acta Amazonica , 2008, DOI: 10.1590/S0044-59672008000400008
Abstract: to demonstrate the importance of the ecological concept for forest management, the object of this work was to identify and describe the structure of tree communities of a tropical forest under management in the eastern amazonia, located in almeirim municipality, in the state of pará, brazil. the floristic survey was undertaken in a terra-firme tropical forest of 1,400.30 hectares. all individuals with dbh > 30 cm were inventoried, registering 77,834 trees distributed in 57 families, 229 genera and 556 species. eight communities were identified, presenting high diversity and floristic equitability (h" = 4.25 average and j" = 0.75 average). the communities presented 138 common species, 119 species of exclusive occurrence and 377 rare species, represented by only one individual. the most remarkable species found in the area were: dinizia excelsa, vouacapoua americana, goupia glabra, mouriri brachyanthera, parinari excelsa, manilkara bidentada, tachigali mymecophyla and licania micrantha. the communities presented significant variations between the averages of the main floristic parameters. some species of commercial value had important variations in the density, suggesting extinction risk in communities where they present very low density. we suggest that all sustainable forest management plans consider the several ecological communities found in the annual production unit (upa) thus avoiding significant variations, caused by exploration and their impacts, in the floristic composition and structure of these communities.
Transscleral diode laser retinopexy in retinal reattachment surgery
Gon?alves, Jo?o Carlos de Miranda;Farah, Michel Eid;
Arquivos Brasileiros de Oftalmologia , 2004, DOI: 10.1590/S0004-27492004000100004
Abstract: purpose: transscleral diode retinal photocoagulation (diopexy) is becoming an accepted technique in the treatment of selected retinal diseases. the objective of this study is to evaluate diopexy technique in the production of adhesive chorioretinal lesions during the surgical treatment of the rhegmatogenous retinal detachment. methods: 25 patients with rhegmatogenous retinal detachment were enrolled in a prospective clinical-surgical study to evaluate the technique of transscleral diode laser photocoagulation to obtain adhesive chorioretinal lesions during retinal reattachment surgery. the surgery consisted of the placement of an exoplant silicon to produce a buckle effect combined with a drainage of subretinal fluid in most cases. results: by a mean follow-up of 10 months, 21 of 25 eyes had their retinas reattached after only one surgery with diopexy used in all cases. conclusion: transscleral diode laser photocoagulation was a technically easy, controlled, effective, reproducible and safe means of obtaining chorioretinal adhesion in retinal reattachment surgery.
Avalia??o de desempenho da Agência Nacional de Vigilancia Sanitária no modelo de contrato de gest?o
Moreira,Elka Maltez de Miranda; Costa,Ediná Alves;
Ciência & Saúde Coletiva , 2010, DOI: 10.1590/S1413-81232010000900013
Abstract: the brazilian national health surveillance agency (anvisa) is supervised by the ministry of health by means of a management contract, a performance evaluation tool. this case study was aimed at describing and analyzing anvisa's performance evaluation model based on the agency's institutional purpose, according to the following analytical categories: the management contract formalization, evaluation tools, evaluators and institutional performance. semi-structured interviews and document analysis revealed that anvisa signed only one management contract with the ministry of health in 1999, updated by four additive terms. the collegiate board of directors and the advisory center for strategic management play the role of anvisa's internal evaluators and an assessing committee, comprising the ministry of health, constitutes its external evaluator. three phases were identified in the evaluation model: the structuring of the new management model (1999-2000), legitimation regarding the productive segment (2001-2004) and widespread legitimation (2005). the best performance was presented in 2000 (86.05%) and the worst in 2004 (40.00%). the evaluation model was shown to have contributed little towards the agency's institutional purpose and the effectiveness measurement of the implemented actions.
Lideran?a situacional em gest?o de projetos: uma revis?o da literatura
Gon?alves, Helen Silva;Mota, Caroline Maria de Miranda;
Produ??o , 2011, DOI: 10.1590/S0103-65132011005000046
Abstract: the leadership style that should be adopted by a project manager is a subject that has been emphasized in recent researches. among several theories, the situational leadership presented by hersey and blanchard (2007) approaches working and psychological maturity as elements that influence the performance of employees. the determination of such level allows the use of an adjustable style of leadership. this article approaches the necessity of using a tool that efficiently assists the project manager to adopt an adjustable style of leadership for the situation. in order to demonstrate how difficult such an activity can be, a research in an information technology company was fulfilled, evaluating the level of maturity. it was observed that, in order to practice a more effective leadership, it is necessary to count on more structuralized methods.
Análise computacional do fen?meno de transferência de calor em paredes divisórias do tipo dry wall
Alves, Maurício C.;Batista, Eduardo de Miranda;
Rem: Revista Escola de Minas , 2007, DOI: 10.1590/S0370-44672007000200013
Abstract: the present work aims to give a contribution to the study of cold-formed steel members under fire condition. specifically, the heat transfer in light steel framed walls with or without thermal insulation was studied. for this, computational models are applied to obtain, with acceptable precision, the values of temperature in any position of the structural system. in this way, it will be possible to describe the temperature distribution (uniform or non-uniform) over the cross-section of the studs that constitute the panel, giving subsidies for stability and pos-buckling analyses of the structural members. the numerical simulations of heat transfer are developed with the aid of computational programs abaqus and safir, both based on the finite element method.
Transscleral diode laser retinopexy in retinal reattachment surgery
Gon?alves Jo?o Carlos de Miranda,Farah Michel Eid
Arquivos Brasileiros de Oftalmologia , 2004,
Abstract: PURPOSE: Transscleral diode retinal photocoagulation (diopexy) is becoming an accepted technique in the treatment of selected retinal diseases. The objective of this study is to evaluate diopexy technique in the production of adhesive chorioretinal lesions during the surgical treatment of the rhegmatogenous retinal detachment. METHODS: 25 patients with rhegmatogenous retinal detachment were enrolled in a prospective clinical-surgical study to evaluate the technique of transscleral diode laser photocoagulation to obtain adhesive chorioretinal lesions during retinal reattachment surgery. The surgery consisted of the placement of an exoplant silicon to produce a buckle effect combined with a drainage of subretinal fluid in most cases. RESULTS: By a mean follow-up of 10 months, 21 of 25 eyes had their retinas reattached after only one surgery with diopexy used in all cases. CONCLUSION: Transscleral diode laser photocoagulation was a technically easy, controlled, effective, reproducible and safe means of obtaining chorioretinal adhesion in retinal reattachment surgery.
Lideran a situacional em gest o de projetos: uma revis o da literatura Situational leadership in project management: a literature review
Helen Silva Gon?alves,Caroline Maria de Miranda Mota
Produ??o , 2011,
Abstract: O estilo de lideran a que deve ser adotado por um gerente de projetos em rela o a seus liderados é um assunto enfatizado em pesquisas recentes. Dentre as teorias, a lideran a situacional apresentada por Hersey e Blanchard (2007) aborda as maturidades para o trabalho e psicológica como elementos que influenciam o desempenho dos funcionários. A determina o de tal nível permite a utiliza o de um estilo de lideran a mais adequado. Este artigo aborda a necessidade de utiliza o de uma ferramenta que auxilie de maneira eficiente o gerente de projetos a adotar o estilo de lideran a mais adequado à situa o e liderados. Para demonstrar o qual difícil pode ser tal atividade, em uma empresa de tecnologia da informa o, foi realizada uma pesquisa avaliando o nível de maturidade de seus liderados. Observou-se que para a lideran a ser mais efetiva deve dispor de métodos mais estruturados para tal. The leadership style that should be adopted by a project manager is a subject that has been emphasized in recent researches. Among several theories, the situational leadership presented by Hersey and Blanchard (2007) approaches working and psychological maturity as elements that influence the performance of employees. The determination of such level allows the use of an adjustable style of leadership. This article approaches the necessity of using a tool that efficiently assists the project manager to adopt an adjustable style of leadership for the situation. In order to demonstrate how difficult such an activity can be, a research in an Information Technology company was fulfilled, evaluating the level of maturity. It was observed that, in order to practice a more effective leadership, it is necessary to count on more structuralized methods.
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