Time filter

Source Type

Rio de Janeiro, Brazil

Vianna M.L.,VM Oceanica LTDA | Menezes V.V.,Brazilian Navy Research Institute
Journal of Geophysical Research: Oceans | Year: 2011

We present here a study of the mean upper layer structure of the South Atlantic Subtropical Gyre (SASG) and its modes of variability based on Archiving, Validation, and Interpretation of Satellite Oceanographic data sea level anomaly data, Gravity Recovery and Climate Experiment-based mean dynamic topography (MDT) models, Reynolds sea surface temperatures, and two tide gauge time series from Permanent Service for Mean Sea Level. Analysis of the MDTs shows that the SASG mean structure is represented by a double-cell circulation, the southern cell being a narrow quasi-zonal strip centered around 33°S. Its southern limb is limited by the recently discovered Saint Helena Current/Tristan da Cunha Current (StHC/TCC) and the North Subtropical Front around 35°S. This system is shown to be well separated from the South Atlantic Current/South Subtropical Front around 42-45°S. A method based on singular spectrum analysis was used to determine the principal modes of variability through the decomposition of the data into band-passed data sets. The altimeter sea level trend analysis suggests that the SASG pattern is slowly migrating southward and has been growing in amplitude between 1994 and 2006 with local growth rates of 5-10 mm/yr occurring in the southern cell. Flow intensifications in this period (2-3 cm/s in the South Equatorial Current and North Brazil Undercurrent, 3.5 cm/s in the Benguela Current), and weakening by 4.5 cm/s in the StHC/TCC are recorded. The altimeter-derived sea level trend is coherent with the growing phase of a bidecadal oscillation found from both tide gauges. Copyright 2011 by the American Geophysical Union.

Ramos M.P.,Brazilian Navy Research Institute
Quintessence international (Berlin, Germany : 1985) | Year: 2012

Nowadays, necrotizing periodontal diseases have a low prevalence; however, a better understanding of the etiopathogenesis of these diseases is necessary for determining more adequate preventive and therapeutic strategies. From a pool of 1,232 HIV-infected patients, 15 presented with necrotizing periodontal diseases, which were evaluated by full-mouth periodontal clinical measurements. Subgingival biofilm samples were collected from necrotizing lesions of six of these individuals. The presence and levels of 47 bacterial species were determined by checkerboard DNA-DNA hybridization. All 15 patients (10 had severe immunodeficiency) had been infected sexually. Thirteen patients were taking antiretroviral medication (66.7% undergoing highly active antiretroviral therapy). Regarding necrotizing periodontal diseases, necrotizing ulcerative gingivitis (60%) was more prevalent than necrotizing ulcerative periodontitis (40%). The frequency of supragingival biofilm and bleeding on probing ranged from 11.5% to 59.2% and 3.0% to 54.0%, respectively, whereas the mean probing depth and clinical attachment level were between 1.48 and 2.61 mm and 1.30 and 2.62 mm, respectively. Species detected in high prevalence and/or counts in necrotizing lesions included Treponema denticola, Eikenella corrodens, Dialister pneumosintes, Enterococcus faecalis, Streptococcus intermedius, Aggregatibacter actinomycetemcomitans, and Campylobacter rectus. In contrast, Parvimonas micra, Prevotella melaninogenica, Fusobacterium nucleatum, Eubacterium nodatum, and Helicobacter pylori were observed in the lowest mean prevalence and/or counts. Necrotizing periodontal disease lesions in HIV-infected patients present a microbiota with high prevalence and/or counts of classical periodontal pathogens, in particular T denticola, as well as species not commonly considered as periodontal pathogens, such as E faecalis and D pneumosintes. In addition, these individuals with necrotizing periodontal disease frequently display severe immunodeficiency and AIDS-defining diseases such as tuberculosis.

Filho W.S.,Brazilian Navy Research Institute | De Seixas J.M.,Federal University of Rio de Janeiro | De Moura N.N.,Federal University of Rio de Janeiro
IET Radar, Sonar and Navigation | Year: 2011

The noise radiated from ships in the ocean contains information about their machinery and can be used for detection and identification purposes. Here, a preprocessing method is developed in order to improve the performance of a feedforward neural network, which is used to classify four classes of ships. The entire system operates in the frequency domain over the information collected by the sensors of a passive sonar system. The effect of spectra averaging, resolution and background noise normalisation in the classifier performance is evaluated. Using preprocessed data to feed the input nodes of the classifier, a classification efficiency of about 97% has been achieved. © 2011 The Institution of Engineering and Technology.

Filho I.L.F.,Brazilian Navy Research Institute | Mosso M.M.,Pontifical Catholic University of Rio de Janeiro
SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Proceedings | Year: 2015

This paper presents a methodology for design a more reliable printed microstrip Rotman lens with the support of electromagnetic simulation software. A lens with four beam ports and four array ports in the range of 4 to 6 GHz is developed and manufactured with simulated and measured results of reflection coefficient, isolation and radiation pattern, showing a good performance of this methodology. © 2015 IEEE.

Correa L.H.L.,Brazilian Navy Research Institute | Custodio G.,Hospital Santa Isabel in Blumenau | Goncalves C.O.,University of South Santa Catarina | Trevisol F.S.,University of South Santa Catarina
Anais Brasileiros de Dermatologia | Year: 2012

BACKGROUND - Skin cancer is the most common neoplasm in Brazil, with increasing incidence in recent decades. Data on the incidence of squamous cell carcinoma are scarce in southern Santa Catarina. OBJECTIVE: To establish epidemiological data on squamous cell carcinoma in Tubarão, State of Santa Catarina. METHODS: A cross-sectional review was conducted on anatomical pathology reports, positive for squamous cell carcinoma of the skin, found in the local laboratories. A convenience sampling method was used for data collection, since all the pathology reports from the local laboratories between 1999 and 2009 were included. The collected variables included year of diagnosis, age, gender, city of origin, tumor site, histological type and subtype, lesion size, margin involvement and relapse. RESULTS: In total, 1,437 case reports were identified, most frequently in individuals between 70 and 79 years old. Patient morbidity was 69.5 per 100,000 population for the year 1999, and 136.7 per 100,000 population for the year 2009, which represents a 50 percent increase. The face was the most affected area and the most common histological subtype was the well-differentiated tumor. CONCLUSION: There were 1,437 reports of squamous cell carcinoma of the skin between 1999 and 2009, with a significant increase in patient morbidity. There was an association between male gender and location on the lip and ear, and between females and the occurrence of squamous cell carcinoma of the skin on the nose, and upper and lower limbs. There was a prevalence of margin involvement after resection in 18% of lesions. © 2012 by Anais Brasileiros de Dermatologia.

Discover hidden collaborations