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Body mass index: different nutritional status according to WHO, OPAS and Lipschitz classifications in gastrointestinal cancer patients
Barao, Katia;Forones, Nora Manoukian;
Arquivos de Gastroenterologia , 2012, DOI: 10.1590/S0004-28032012000200013
Abstract: context: the body mass index (bmi) is the most common marker used on diagnoses of the nutritional status. the great advantage of this index is the easy way to measure, the low cost, the good correlation with the fat mass and the association to morbidity and mortality. objective: to compare the bmi differences according to the who, opas and lipschitz classification. methods: a prospective study on 352 patients with esophageal, gastric or colorectal cancer was done. the bmi was calculated and analyzed by the classification of who, lipschitz and opas. results: the mean age was 62.1 ± 12.4 years and 59% of them had more than 59 years. the bmi had not difference between the genders in patients <59 years (p = 0.75), but over 59 years the bmi was higher in women (p<0.01). the percentage of undernourished was 7%, 18% and 21% (p<0.01) by who, lipschitz and opas, respectively. the overweight/obesity was also different among the various classifications (p<0.01). conclusions: most of the patients with gastrointestinal cancer had more than 65 years. a different cut off must be used for this patients, because undernourished patients may be wrongly considered well nourished.
Non-parametric determination of H and He IS fluxes from cosmic-ray data
A. Ghelfi,F. Barao,L. Derome,D. Maurin
Physics , 2015,
Abstract: Top-of-atmosphere (TOA) cosmic-ray (CR) fluxes from satellites and balloon-borne experiments are snapshots of the solar activity imprinted on the interstellar (IS) fluxes. Given a series of snapshots, the unknown IS flux shape and the level of modulation (for each snapshot) can be recovered. We wish (i) to provide the most accurate determination of the IS H and He fluxes from TOA data only, (ii) to obtain the associated modulation levels (and uncertainties) fully accounting for the correlations with the IS flux uncertainties, and (iii) to inspect whether the minimal Force-Field approximation is sufficient to explain all the data at hand. Using H and He TOA measurements, including the recent high precision AMS, BESS-Polar and PAMELA data, we perform a non-parametric fit of the IS fluxes $J^{\rm IS}_{\rm H,~He}$ and modulation level $\phi_i$ for each data taking period. We rely on a Markov Chain Monte Carlo (MCMC) engine to extract the PDF and correlations (hence the credible intervals) of the sought parameters. Despite H and He being the most abundant and best measured CR species, several datasets must be excluded from the analysis due to inconsistencies with other measurements. From the subset of data passing our consistency cut, we provide ready-to-use best-fit and credible intervals for the H and He IS fluxes from MeV/n to PeV/n energy (with a relative precision in the range $[2-10\%]$ at 1$\sigma$). Given the strong correlation between $J^{\rm IS}$ and $\phi_i$ parameters, the uncertainties on $J^{\rm IS}$ translate into $\Delta\phi\approx \pm 30$ MV (at 1$\sigma$) for all experiments. We also find that the presence of $^3$He in He data biases $\phi$ towards higher $\phi$ values by $\sim 30$ MV. The force-field approximation, despite its limitation, gives an excellent ($\chi^2/$dof$=1.02$) description of the recent high-precision TOA H and He fluxes.
Cerenkov angle and charge reconstruction with the RICH detector of the AMS experiment
F. Barao,L. Arruda,J. Borges,P. Goncalves,M. Pimenta,I. Perez
Physics , 2002, DOI: 10.1016/S0168-9002(03)00294-8
Abstract: The Alpha Magnetic Spectrometer (AMS) experiment to be installed on the International Space Station (ISS) will be equipped with a proximity focusing Ring Imaging Cerenkov (RICH) detector, for measurements of particle electric charge and velocity. In this note, two possible methods for reconstructing the Cerenkov angle and the electric charge with the RICH, are discussed. A Likelihood method for the Cerenkov angle reconstruction was applied leading to a velocity determination for protons with a resolution of around 0.1%. The existence of a large fraction of background photons which can vary from event to event, implied a charge reconstruction method based on an overall efficiency estimation on an event-by-event basis.
Discrepancies between Abstracts Presented at International Association for Dental Research Annual Sessions from 2004 to 2005 and Full-Text Publication
Soni Prasad,Damian J. Lee,Judy Chia-Chun Yuan,Valentim A. R. Barao,Nodesh Shyamsunder,Cortino Sukotjo
International Journal of Dentistry , 2012, DOI: 10.1155/2012/859561
Abstract: Purpose. The purpose of this study was to evaluate the discrepancies between abstracts presented at the IADR meeting (2004-2005) and their full-text publication. Material and Methods. Abstracts from the Prosthodontic Section of IADR meeting were obtained. The following information was collected: abstract title, number of authors, study design, statistical analysis, outcome, and funding source. PubMed was used to identify the full-text publication of the abstracts. The discrepancies between the abstract and the full-text publication were examined, categorized as major and minor discrepancies, and quantified. The data were collected and analyzed using descriptive analysis. Frequency and percentage of major and minor discrepancies were calculated. Results. A total of 109 (95.6%) articles showed changes from their abstracts. Seventy-four (65.0%) and 105 (92.0%) publications had at least one major and one minor discrepancies, respectively. Minor discrepancies were more prevalent (92.0%) than major discrepancies (65.0%). The most common minor discrepancy was observed in the title (80.7%), and most common major discrepancies were seen in results (48.2%). Conclusion. Minor discrepancies were more prevalent than major discrepancies. The data presented in this study may be useful to establish a more comprehensive structured abstract requirement for future meetings.
Effects of Dextrose and Lipopolysaccharide on the Corrosion Behavior of a Ti-6Al-4V Alloy with a Smooth Surface or Treated with Double-Acid-Etching
Leonardo P. Faverani, Wirley G. Assun??o, Paulo Sérgio P. de Carvalho, Judy Chia-Chun Yuan, Cortino Sukotjo, Mathew T. Mathew, Valentim A. Barao
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093377
Abstract: Diabetes and infections are associated with a high risk of implant failure. However, the effects of such conditions on the electrochemical stability of titanium materials remain unclear. This study evaluated the corrosion behavior of a Ti-6Al-4V alloy, with a smooth surface or conditioned by double-acid-etching, in simulated body fluid with different concentrations of dextrose and lipopolysaccharide. For the electrochemical assay, the open-circuit-potential, electrochemical impedance spectroscopy, and potentiodynamic test were used. The disc surfaces were characterized by scanning electron microscopy and atomic force microscopy. Their surface roughness and Vickers microhardness were also tested. The quantitative data were analyzed by Pearson's correlation and independent t-tests (α = 0.05). In the corrosion parameters, there was a strong lipopolysaccharide correlation with the Ipass (passivation current density), Cdl (double-layer capacitance), and Rp (polarization resistance) values (p<0.05) for the Ti-6Al-4V alloy with surface treatment by double-acid-etching. The combination of dextrose and lipopolysaccharide was correlated with the Icorr (corrosion current density) and Ipass (p<0.05). The acid-treated groups showed a significant increase in Cdl values and reduced Rp values (p<0.05, t-test). According to the topography, there was an increase in surface roughness (R2 = 0.726, p<0.0001 for the smooth surface; R2 = 0.405, p = 0.036 for the double-acid-etching-treated surface). The microhardness of the smooth Ti-6Al-4V alloy decreased (p<0.05) and that of the treated Ti-6Al-4V alloy increased (p<0.0001). Atomic force microscopy showed changes in the microstructure of the Ti-6Al-4V alloy by increasing the surface thickness mainly in the group associated with dextrose and lipopolysaccharide. The combination of dextrose and lipopolysaccharide affected the corrosion behavior of the Ti-6Al-4V alloy surface treated with double-acid-etching. However, no dose-response corrosion behavior could be observed. These results suggest a greater susceptibility to corrosion of titanium implants in diabetic patients with associated infections.
The AMS-01 Aerogel Threshold Cherenkov counter
D. Barancourt,F. Barao,G. Barbier,G. Barreira,M. Buenerd,G. Castellini,E. Choumilov,J. Favier,N. Fouque,A. Gougas,V. Hermel,R. Kossakowski,G. Laborie,G. Laurenti,S. -C. Lee,F. Mayet,B. Meillon,Y. -T. Oyang,V. Plyaskin,V. Pojidaev,C. Rossin,D. Santos,F. Vezzu,J. P. Vialle
Physics , 2000, DOI: 10.1016/S0168-9002(01)00464-8
Abstract: The Alpha Magnetic Spectrometer in a precursor version (AMS-01), was flown in June 1998 on a 51.6 degrees orbit and at altitudes ranging between 320 and 390 km, on board of the space shuttle Discovery (flight STS-91). AMS-01 included an Aerogel Threshold Cherenkov counter (ATC) to separate antiprotons from electrons and positrons from protons, for momenta below 3.5 GeV/c. This paper presents a description of the ATC counter and reports on its performances during the flight STS-91.
The AMS-02 RICH Imager Prototype - In-Beam Tests with 20 GeV/c per Nucleon Ions -
M. Buenerd,P. Aguayo,M. Aguilar Benitez,L. Arruda,F. Barao,A. Barrau,B. Baret,E. Belmont,J. Berdugo,G. Boudoul,J. Borges,D. Casadei,J. Casaus,C. Delgado,C. Diaz,L. Derome,L. Eraud,L. Gallin-Martel,F. Giovacchini,P. Goncalves,E. Lanciotti,G. Laurenti,A. Malinine,C. Mana,J. Marin,G. Martinez,A. Menchaca-Rocha,C. Palomares,M. Pimenta,K. Protasov,E. Sanchez,E-S. Seo,I. Sevilla,A. Torrento,M. Vargas-Trevino
Physics , 2003,
Abstract: A prototype of the AMS Cherenkov imager (RICH) has been tested at CERN by means of a low intensity 20 GeV/c per nucleon ion beam obtained by fragmentation of a primary beam of Pb ions. Data have been collected with a single beam setting, over the range of nuclear charges 2
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