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Search Results: 1 - 10 of 33843 matches for " Raphael;Oliveira "
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Cross-Correlation of Station-to-Station Free Surface Elevation Time Series for Breaking Water Waves  [PDF]
Raphael Mukaro
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.92010
Free surface elevation time series of breaking water waves were measured in a laboratory flume. This was done in order to analyze changes in wave characteristics as the waves propagated from deep water to the shore. A pair of parallel- wire capacitive wave gages was used to simultaneously measure free surface elevations at different positions along the flume. One gage was kept fixed near the wave generator to provide a reference while the other was moved in steps of 0.1 m in the vicinity of the break point. Data from these two wave gages measured at the same time constitute station-to-station free surface elevation time series. Fast Fourier Transform (FFT) based cross-correlation techniques were employed to determine the time lag between each pair of the time series. The time lag was used to compute the phase shift between the reference wave gage and that at various points along the flume. Phase differences between two points spaced 0.1 m apart were used to calculate local mean wave phase velocity for a point that lies in the middle. Results show that moving from deep water to shallow water, the measured mean phase velocity decreases almost linearly from about 1.75 m/s to about 1.50 m/s at the break point. Just after the break point, wave phase velocity abruptly increases to a maximum value of 1.87 m/s observed at a position 30 cm downstream of the break point. Thereafter, the phase velocity decreases, reaching a minimum of about 1.30 m/s.
A conquista da metrópole profana: uma análise da territorialidade religiosa como instrumento da patrimonializa o imaterial em Fortaleza (CE)
Luiz Raphael Teixeira da Silva,Christian Dennys Monteiro de Oliveira
Revista Brasileira de Ecoturismo , 2013,
Abstract: O estudo faz uma análise geográfica comparativa da efervescência inovadora da religiosidade contemporanea, a partir da perspectiva de territorialidades religiosas na escala da metrópole de Fortaleza. A pesquisa considera as estratégias e dinamicas do Santuário de Nossa Senhora da Assun o e do Ministério Cana da Assembléia de Deus, no Brasil. Ambos se apresentam em constante mudan a e adequa o às práticas sócio-espaciais modernas. Fato que tem provocado inúmeras rea es na forma o do campo religioso atual de Fortaleza, expressando o adensamento de espa os simbólicos; cada vez mais percebidos pelo grande número de templos religiosos na metrópole e o crescente número de festas religiosas em seu espa o público. A fundamenta o teórica da Geografia Cultural e da Geografia da Religi o contribuiu com o conceito de espa o sagrado e ajudou na demarca o de territórios simbólicos. E a investiga o mostrou como seu entorno profano sacraliza-se durante momentos passageiros, produzindo uma religiosidade móvel, característica da mudan a do perfil religioso da popula o de Fortaleza. Segundo análises comparativas dos Censos demográficos do IBGE de 1991 e 2000 e interpreta es de dados da Pesquisa de Or amentos Familiares – POF. Além da verifica o de dados de pesquisas específicas realizadas por institui es religiosas do Brasil e do exterior, bem como de universidades brasileiras. Elucidando o processo de ressiginifica o dos dois grupos religiosos, que com suas estratégias espetaculares, festivas e promocionais, formam um espa o mediador de práticas sacro-profanas, capazes de influenciar diretamente o planejamento cultural e religioso de áreas metropolitanas como Fortaleza.
Asymptotic Entanglement Dynamics and Geometry of Quantum States
Raphael Campos Drumond,Marcelo de Oliveira Terra Cunha
Mathematics , 2008, DOI: 10.1088/1751-8113/42/28/285308
Abstract: A given dynamics for a composite quantum system can exhibit several distinct properties for the asymptotic entanglement behavior, like entanglement sudden death, asymptotic death of entanglement, sudden birth of entanglement, etc. A classification of the possible situations was given in [M. O. Terra Cunha, {\emph{New J. Phys}} {\bf{9}}, 237 (2007)] but for some classes there were no known examples. In this work we give a better classification for the possibile relaxing dynamics at the light of the geometry of their set of asymptotic states and give explicit examples for all the classes. Although the classification is completely general, in the search of examples it is sufficient to use two qubits with dynamics given by differential equations in Lindblad form (some of them non-autonomous). We also investigate, in each case, the probabilities to find each possible behavior for random initial states.
Antimicrobial resistance profiles of diarrheagenic Escherichia coli strains isolated from bathing waters of the Lajeado reservoir in Tocantins, Brazil
Kleverson Wessel de Oliveira,Fátima de Cássia Oliveira Gomes,Guilherme Benko,Raphael Sanzio Pimenta
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2012,
Abstract: The exposure to contaminated water constitutes an important mechanism for the transmission of gastrointestinal pathogens. Diarrheagenic Escherichia coli strains cause enteric infections in humans and include six different categories according to virulence factors. This paper aims at detecting the presence of diarrheagenic E. coli strains in bathing waters of seven beaches of Lajeado Reservoir, in the Tocantins River in Brazil, and to test the resistance to antimicrobial drugs to correlate with possible contamination of the water with human feces. Total coliform and E. coli counts were done by the Colilert chromogenic substrate technique. Biochemical identification was accomplished by API20E and detection of virulence factors by PCR, employing specific primers for Shiga, LT, and ST and intimin genes. The susceptibility to 16 antibiotics was tested by disk-diffusion technique. Among one hundred and forty-nine strains of E. coli, two strains of EPEC and two of ETEC were detected in waters of beaches situated in urban areas, close to sewage discharge. These strains presented resistance to three to six antibiotics. Human origin is suggested based on the multiresistant profile of these strains.
Adaptability and Stability Analysis of Soybean Genotypes Using Toler and Centroid Methods  [PDF]
Raphael Lemes Hamawaki, Osvaldo Toshiyuki Hamawaki, Ana Paula Oliveira Nogueira, Cristiane Divina Lemes Hamawaki, Larissa Barbosa Sousa, David A. Lightfoot, Stella K. Kantartzi
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.69150
Abstract: Soybean (Glycine max L. Merr.) adaptation to new environments has been hard to predict based on maturity group. The aim of this study was to evaluate the performance of 14 soybean genotypes, from the Soybean Breeding Program of the Federal University of Uberlandia, in their adaptive capacity and seed yield stability at 3 locations and 2 growing seasons. For the adaptability and stability analysis the Toler and Centroid methods were used; 5 genotypic groups were identified in the first whereas 4 groups were identified in the latter. By the Toler method group A was composed by 4 genotypes, UFU-001, UFU-003, UFU-0010, and UFU-001. They showed a convex pattern of adaptability and stability. In contrast, the genotypes UFU-008 and UFU-0013 were classified in Group E with a concave pattern of adaptability and stability. Regarding results from the Centroid method, the Genotype UFU-002, with higher seed yield than average, was the only genotype in Ideotype VI with moderate adaptability to favorable environments. In contrast, 10 genotypes were included in the Ideotype V, of medium general adaptability. The genotypes UFU-001, UFU-002, UFU-006, UFU-0010, and UFU-0011 were recommended for use in the Brazilian Cerrado growing region. These genotypes had high seed yield potential in high quality environments.
Optimization of an Ammonia Synthesis Converter  [PDF]
Jackson Gunorubon Akpa, Nwokoma Raphael Raphael
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.24032
Abstract: A scheme that optimizes the converter of an ammonia synthesis plant to determine optimal inlet temperatures of the catalyst beds has been developed. The optimizer maximizes an objective function—The fractional conversion of nitrogen on the four catalyst beds of the converter subject to variation of the inlet temperature to each catalyst bed. An iterative procedure was used to update the initial values of inlet temperature thus ensuring accurate results and quick convergence. Converter model results obtained with optimized operating conditions showed significant increase in fractional conversion of 42.38% (from 0.1949 to 0.2586), increased rate of reaction evident in a 13.18% (0.5317 to 0.4616) and 23.84% (0.1946 to 0.1482) reduction in reactants (hydrogen and nitrogen) concentration respectively and a 56.48% increase (from 0.1181 to 0.1838) in ammonia concentration at the end of the fourth catalyst bed compared to results obtained with industrial operating conditions.
Sponsor-investigator-relationship: challenges, recent regulatory developments and future legislative trends  [PDF]
Raphael Richard Ciuman
Health (Health) , 2011, DOI: 10.4236/health.2011.312128
Abstract: Correct definition and management of sponsor- investigator relationship is of central importance for planing and executing clinical trials. During the last decade, there have been numerous modifications of guidelindes, international and national legislations and regulations. This implicated various alterations and shifts of essential responsibilities and tasks relating to the investigator, sponsor or sponsor-investigator what raised financial, clinical and ethical issues. First experiences with these new regulations and legislations are discussed together with international differences and their impacts on clinical trials. Regarding non-commercial trials and institutional sponsorship, there are still open organizational and legal questions after national implementation of the Europeam Clinical Trials Directive in 2004, although various approaches have been suggested in recent years in Europe. Current trends and controversies are discussed as well. A literature review was performed summarizing recent experiences with current legislations and risen controversies of these new legislations showing impact on future trends.
Corrosion Studies on Stainless Steel (FE6956) in Hydrochloric Acid Solution  [PDF]
Raphael Shadai Oguike
Advances in Materials Physics and Chemistry (AMPC) , 2014, DOI: 10.4236/ampc.2014.48018
Abstract: The effect of hydrochloric acid concentration on stainless steel (Fe6956) at temperature range 303 - 333 ± 1 K has been studied using weight loss, thermometric and electrochemical polarization techniques. The corrosion rate of the stainless steel was found to be dependent on both temperature variation and acid concentration. The potentiostatic study showed that the active passive transition depends strongly on acid concentration while the weight loss measurements revealed that 2 M HCl at temperature 333 K had an appreciable corrosion rate which corresponds to 14.04 × 10﹣3 reaction number (RN) got from thermometric monitoring. Arrhenius equation and transition state theory were used to calculate kinetic and thermodynamic parameter such as Ea, ΔH* and ΔS*. Results obtained showed that corrosion reaction of Fe6956 in HCl is spontaneous and there is good agreement between the data got from the techniques employed.
Disclosing Parental Human Immunodeficiency Virus (HIV) Status to Children in Ghana: Reasons for and against Disclosure and Effects of Decision  [PDF]
Raphael Avornyo, John Amoah
Advances in Applied Sociology (AASoci) , 2014, DOI: 10.4236/aasoci.2014.49025
Abstract: There is limited data regarding HIV disclosure in Ghana. This study sought to examine parental disclosure of HIV status to children, ascertain reasons for disclosure and nondisclosure and also the effects of parents’ decision. 26 parents living with HIV and 21 children were selected in Accra and Cape Coast purposively and conveniently and interviewed. Out of a total of 26 parents living with HIV, the majority numbering 18, made up of two males and 16 females had not disclosed their status. Reasons for nondisclosure included: fear of stigmatization and discrimination; children being too young; not wanting the children to get worried; and children thinking their parents would die. The majority of those, who had done the disclosure, were young. One effect was that most children became sad, after the status of their parents had been disclosed to them. They, however, readjusted and provided support to their parents. Another effect was that the children became knowledgeable or more knowledgeable about HIV and AIDS. In a country, where HIV is seen as a shameful disease, Persons Living with HIV (PLHIV) experience massive stigmatization and discrimination. Intensification of the fight against stigmatization and discrimination and equipping of PLHIV with skills necessary for disclosure are critical.
Melhoramento da cana-de-a?úcar. II. Experimentos regionais com clones obtidos em 1964
Segalla, Antonio Lazzarini;Alvarez, Raphael;Oliveira, Hélcio de;Igue, Toshio;Godoy Jr., Gentil;
Bragantia , 1982, DOI: 10.1590/S0006-87051982000100011
Abstract: three experiments were conducted in 1971 with clones obtained by hybridization in 1964, using a lattice design. these experiments were located in the sert?ozinho, ariranha and tapiratiba counties of the state of s?o paulo. the checks utilized were the commercial varieties cb41-76, iac50-134 and iac51-205. sugarcane was harvested thrice, that is plant cane (18 months), first ratoon (12 months) and second ratoon (12 months). the clones that showed good performance received the prefix iac which were 64-257, 64-328, 64-306, 64-276, 64-368, 64-321 and 64-304.
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