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Search Results: 1 - 10 of 342278 matches for " Paula S. Teixeira "
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Spokes cluster: The search for the quiescent gas
Jaime E Pineda,Paula S. Teixeira
Physics , 2013, DOI: 10.1051/0004-6361/201220861
Abstract: Context. Understanding the role of fragmentation is one of the most important current questions of star formation. To better understand the process of star and cluster formation, we need to study in detail the physical structure and properties of the parental molecular cloud. The Spokes cluster, or NGC 2264 D, is a rich protostellar cluster where previous N2H+(1-0) observations of its dense cores presented linewidths consistent with supersonic turbulence. However, the fragmentation of the most massive of these cores appears to have a scale length consistent with that of the thermal Jeans length, suggesting that turbulence was not dominant. Aims. These two results probe different density regimes. Our aim is to determine if there is subsonic or less-turbulent gas (than previously reported) in the Spokes cluster at higher densities. Methods. We present APEX N2H+(3-2) and N2D+(3-2) observations of the NGC2264-D region to measure the linewidths and the deuteration fraction of the higher density gas. The critical densities of the selected transitions are more than an order of magnitude higher than that of N2H+(1-0). Results. We find that the N2H+(3-2) and N2D+(3-2) emission present significantly narrower linewidths than the emission from N2H+(1-0) for most cores. In two of the spectra, the nonthermal component is close (within 1-sigma) to the sound speed. In addition, we find that the three spatially segregated cores, for which no protostar had been confirmed show the highest levels of deuteration. Conclusions. These results show that the higher density gas, probed with N2H+ and N2D+(3-2), reveals more quiescent gas in the Spokes cluster than previously reported. More high-angular resolution interferometric observations using high-density tracers are needed to truly assess the kinematics and substructure within NGC2264-D. (Abridged)
Foliar application of calcium chloride and calcium silicate decreases white mold intensity on dry beans Aplica o foliar de cloreto de cálcio e silicato de cálcio reduz a intensidade do mofo-branco do feijoeiro
Trazilbo J. Paula Júnior,Rogério F. Vieira,Hudson Teixeira,José Eustáquio S. Carneiro
Tropical Plant Pathology , 2009, DOI: 10.1590/s1982-56762009000300006
Abstract:
AVALIA O DA PRODUTIVIDADE DAS SILAGENS DE GIRASSOL, MILHO, SORGO E MILHETO EM DIFERENTES ESPA AMENTOS
TEIXEIRA, Fabrício Ant?nio,AMIN, Willian Garofo,MELLO, Sílvio de Paula
Nucleus , 2009,
Abstract: The experimental work was conducted on the campus of FAFRAM, Faculty "Dr. Francisco Maeda", located in the municipality of Ituverava, SP, in the period from November 14, 2007 to February 12, 2008, aimingto evaluate the productivity of green matter on crops of sunflower, corn, millet and sorghum in different spacings, forsilage. The experimental design was a randomized blocks in a factorial 4 x 4 with two replications. Each plot wasformed by three meters, with spacing of 0,50, 0,60, 0,70 and 0,80 meters. The results were significant for the weightof the stem, weight of the chapter and total weight of green matter (PTMV) in sunflower cultivation. For the weightof the sheet was a significant difference for corn. In spacing of 0,60, 0,70 and 0,80 meters, the weights of Stockholm,ear, panicle and PTMV not have significant differences. For the weight of leaf, the spacing of 0,80 provided betteraverage. As the weight of the stem on crops of sunflower, millet, maize and sorghum in the spacing of 0,50, 0,60,0,70 and 0,80 m, obtained significant results in the four spacing the culture of sunflower registering 28.166,66 kg,31.526,51 kg, 43.450,20 kg and 39.062,49 kg respectively. It was concluded that the total production of green massfor the cultivation of sunflower, millet and corn was higher with the spacing of 0,80 meters, while the cultivation ofsorghum production was higher with the spacing of 0,60 meters.O trabalho experimental foi conduzido no Campus da FAFRAM, Faculdade “Dr. Francisco Maeda”,localizada no município de Ituverava, SP, no período de 14 de novembro de 2007 a 12 de fevereiro de 2008, com oobjetivo de avaliar a produtividade de matéria verde nas culturas de girassol, milho, milheto e sorgo em diferentesespa amentos, para silagem. O delineamento experimental foi o de blocos ao acaso em um esquema fatorial 4 x 4com duas repeti es. Cada parcela foi constituída por três metros lineares, com espa amentos de 0,50, 0,60, 0,70 e0,80 metros. Os resultados foram significativos para o peso do colmo, peso do capítulo e peso total de matéria verde(PTMV) na cultura do girassol. Já para o peso da folha observou-se diferen a significativa para a cultura do milho.Nos espa amentos de 0,60, 0,70 e 0,80 metros, os pesos de colmo, espiga, panícula e PTMV n o apresentamdiferen as significativas. Já para o peso de folha, o espa amento de 0,80 proporcionou melhor média. Quanto aopeso do colmo nas culturas de girassol, milheto, milho e sorgo nos espa amentos de 0,50, 0,60, 0,70 e 0,80 m,obtiveram resultados significativos nos quatro espa amentos a cultura do girassol
International Conference on Perception and Action no Brasil
Paula Lanna Pereira da Silva,Sérgio Teixeira da Fonseca,Juliana Melo Ocarino
Brazilian Journal of Physical Therapy , 2011, DOI: 10.1590/s1413-35552011000300001
Abstract:
IRS Characterization of a Debris Disk around an M-type star in NGC2547
Paula S. Teixeira,Charles J. Lada,Kenneth Wood,Thomas P. Robitaille,Kevin L. Luhman
Physics , 2009, DOI: 10.1088/0004-637X/700/1/454
Abstract: We present 5 to 15 micron Spitzer Infrared Spectrograph (IRS) low resolution spectral data of a candidate debris disk around an M4.5 star identified as a likely member of the ~40 Myr old cluster NGC2547. The IRS spectrum shows a silicate emission feature, indicating the presence of warm, small, (sub)micron-sized dust grains in the disk. Of the fifteen previously known candidate debris disks around M-type stars, the one we discuss in this paper is the first to have an observed mid-infrared spectrum and is also the first to have measured silicate emission. We combined the IRS data with ancillary data (optical, JHKs, and Spitzer InfraRed Array Camera and 24 micron data) to build the spectral energy distribution (SED) of the source. Monte Carlo radiation transfer modeling of the SED characterized the dust disk as being very flat (h100=2AU) and extending inward within at least 0.13AU of the central star. Our analysis shows that the disk is collisionally dominated and is likely a debris disk.
Hierarchical Fragmentation of the Orion Molecular Filaments
Satoko Takahashi,Paul T. P. Ho,Paula S. Teixeira,Luis A. Zapata,Yu-Nung Su
Physics , 2012, DOI: 10.1088/0004-637X/763/1/57
Abstract: We present a high angular resolution map of 850 um continuum emission of the Orion Molecular Cloud-3 (OMC 3) obtained with the Submillimeter Array (SMA); the map is a mosaic of 85 pointings covering an approximate area of 6'.5 x 2'.0 (0.88 x 0.27 pc). We detect 12 spatially resolved continuum sources, each with an H_2 mass between 0.3-5.7 Mo and a projected source size between 1400-8200 AU. All the detected sources are on the filamentary main ridge n_H2>10^6 cm^-3), and analysis based on the Jeans theorem suggests that they are most likely gravitationally unstable. Comparison of multi-wavelength data sets indicates that of the continuum sources, 6/12 (50 %) are associated with molecular outflows, 8/12 (67 %) are associated with infrared sources, and 3/12 (25 %) are associated with ionized jets. The evolutionary status of these sources ranges from prestellar cores to protostar phase, confirming that OMC-3 is an active region with ongoing embedded star-formation. We detect quasi-periodical separations between the OMC-3 sources of ~17"/0.035 pc. This spatial distribution is part of a large hierarchical structure, that also includes fragmentation scales of GMC (~35 pc), large-scale clumps (~1.3 pc), and small-scale clumps (~0.3 pc), suggesting that hierarchical fragmentation operates within the Orion A molecular cloud. The fragmentation spacings are roughly consistent with the thermal fragmentation length in large-scale clumps, while for small-scale cores it is smaller than the local fragmentation length. These smaller spacings observed with the SMA can be explained by either a helical magnetic field, cloud rotation, or/and global filament collapse. Finally, possible evidence for sequential fragmentation is suggested in the northern part of the OMC-3 filament.
ESTRATéGIA DE ENGENHARIA DE REQUISITOS PARA AMBIENTES DE REALIDADE AUMENTADA
Paula Teixeira Nakamoto
JISTEM - Journal of Information Systems and Technology Management , 2012,
Abstract: A Realidade Aumentada (RA) apresenta a vantagem de permitir o uso de a es tangíveis e de opera es multimodais, envolvendo voz, gestos, tato, etc. Devido a sua variedade de interfaces é notavelmente maior a complexidade em projetá-las e usá-las. Logo, os projetistas desses sistemas precisam desenvolver um projeto centrado no usuário, se n o vários problemas de usabilidade poder o surgir. Para solucionar esse problema, os projetistas de ambientes em RA precisam de orienta es, guias e diretrizes para auxiliá-los na constru o do projeto. Até a data, guias de projeto para RA que podem ser encontrados na literatura s o sugest es bastante estreitas, derivadas de problemas específicos dos pesquisadores. Este trabalho tem o objetivo de apresentar uma investiga o que resultou em uma Estratégia de Análise de Requisitos para constru o de ambientes com RA. Como resultado dessa estratégia, est o disponíveis para os projetistas guias, atividades da análise do domínio e formulários que o auxiliam na análise de requisitos e na tomada de decis es de como proceder na implementa o do sistema. A eficácia da estratégia é verificada com a sua aplica o a um meta-modelo de especifica o de requisitos para a constru o de um sistema para o auxílio do tratamento da Aracnofobia.
Primary Uterine Angiosarcoma
Pina,Carla; Teixeira,Marcília; Torres,Sílvia; Oliveira,Cristina; Ferreira,Eduardo; Alves,António; Branco,Paula;
Arquivos de Medicina , 2008,
Abstract: primary uterine angiosarcoma is a malignant tumor of the vascular endothelium that occurs predominately in peri and postmenopausal women with uterine bleeding and anemia. we present a case of a 66-year-old woman with uterine angiosarcoma who underwent abdominal hysterectomy and bilateral salpingo-oophorectomy, showing the importance of immunohistochemical staining in making the ?nal diagnose. histologically, the tumor has anastomosing vascular channels lined by highly atypical endothelial cells. immunohistochemical staining was positive for endothelial markers cd31 and vimentin, supporting the diagnosis of uterine angiosarcoma. primary uterine angiosarcoma tend to demonstrate a highly malignant behavior. the major prognostic factors seems to be the size of the tumor at diagnosis and the presence of extra pelvic disease. no consensus exist for best possible therapy given the few cases from which to draw conclusions.
Prevalence and factors associated with rectal vancomycin-resistant enterococci colonization in two intensive care units in S?o Paulo, Brazil
Furtado, Guilherme Henrique Campos;Martins, Sinaida Teixeira;Coutinho, Ana Paula;Wey, Sérgio Barsanti;Medeiros, Eduardo Alexandrino Servolo;
Brazilian Journal of Infectious Diseases , 2005, DOI: 10.1590/S1413-86702005000100011
Abstract: vancomycin-resistant enterococci (vre) are important pathogens causing nosocomial infections, and there is reason for concern about their resistance and great ability to spread in hospital environments, especially intensive-care units (icu). to determine the prevalence of rectal colonization by vre, and the risk factors associated with their presence, rectal surveillance swabs were taken from patients under treatment in two intensive-care units (one medical and another both medical and surgical) at s?o paulo hospital, over a two-year period. thirty-three percent of the 147 patients evaluated had vre. the only significant variable in the logistic regression was the length of stay in the icu.
Fluorescência e teores de clorofilas em abacaxizeiro cv. pérola submetido a diferentes concentra??es de sulfato de am?nio
Vieira, Darlene Ana de Paula;Portes, Tomás de Aquino;Stacciarini-Seraphin, Eliane;Teixeira, Jo?o Batista;
Revista Brasileira de Fruticultura , 2010, DOI: 10.1590/S0100-29452010005000061
Abstract: the present research aimed to analyze chlorophyll a fluorescence emission as well as chlorophyll levels in ananas comosus (l. merril) cv pérola grown under greenhouse conditions and submitted to four concentration of nitrogen, through addition or not of ammonium sulphate according to the following treatments: to= 0.000; t1/2 = 0.015; t1 =0.030; and t2 = 0.060 g/kg soil. determinations of minimum (f0), maximum (fm), variable (fv), and terminal (ft) fluorescence and maximum photochemical efficiency (fv/fm) of dark-adapted leaves were carried out during the day, five days after the second application of ammonium sulphate, carried out 120 days after the transplant. the results showed that the addition of ammonium sulphate affected variable and maximum fluorescence, but not minimum and terminal fluorescence neither the photochemical efficiency. there were significant alterations in relation to the time of the day in which the fluorescence was read. differences in leaf chlorophyll concentration were significant among treatments in relation to variations of ammonium sulphate concentration, with increase for chlorophyll a, total and to the ratio chlorophyll a/b, but not for chlorophyll b.
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