36 research outputs found
Availability analysis of a ship-to-ground FSO link
This paper analyzes the availability of a free-space optical (FSO) communication link, established between a maritime platform and a land base. In this analysis, the impact of the laser beam misalignment, caused by the vesselâs six oscillatory motions in a seaway, is considered. The hydrodynamic system is modeled, through a shipâs response amplitude operator (RAO), under a typical sea-state condition. Finally, the link availability is calculated based on FSO losses, considering a beam with Gaussian power distribution
Diversidade genética entre acessos de capim-elefante obtida com marcadores moleculares
Seleção fenotĂpica e assistida por marcadores moleculares de famĂlias de feijoeiro-comum com alta produtividade
Human toxocariasis: contribution by Brazilian researchers
In the present paper the main aspects of the natural history of human infection by Toxocara larvae that occasionally result in the occurrence of visceral and/or ocular larva migrans syndrome were reviewed. The contribution by Brazilian researchers was emphasized, especially the staff of the Tropical Medicine Institute of SĂŁo Paulo (IMT)
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Retest variability and patient reliability indices of quantitative fundus autofluorescence in age-related macular degeneration: a MACUSTAR study report
This study aimed to determine the retest variability of quantitative fundus autofluorescence (QAF) in patients with and without age-related macular degeneration (AMD) and evaluate the predictive value of patient reliability indices on retest reliability. A total of 132 eyes from 68 patients were examined, including healthy individuals and those with various stages of AMD. Duplicate QAF imaging was conducted at baseline and 2Â weeks later across six study sites. Intraclass correlation (ICC) analysis was used to evaluate the consistency of imaging, and mean opinion scores (MOS) of image quality were generated by two researchers. The contribution of MOS and other factors to retest variation was assessed using mixed-effect linear models. Additionally, a Random Forest Regressor was trained to evaluate the extent to which manual image grading of image quality could be replaced by automated assessment (inferred MOS). The results showed that ICC values were high for all QAF images, with slightly lower values in AMD-affected eyes. The average inter-day ICC was found to be 0.77 for QAF segments within the QAF8 ring and 0.74 for peripheral segments. Image quality was predicted with a mean absolute error of 0.27 on a 5-point scale, and of all evaluated reliability indices, MOS/inferred MOS proved most important. The findings suggest that QAF allows for reliable testing of autofluorescence levels at the posterior pole in patients with AMD in a multicenter, multioperator setting. Patient reliability indices could serve as eligibility criteria for clinical trials, helping identify patients with adequate retest reliability
Comparability of automated drusen volume measurements in age-related macular degeneration: a MACUSTAR study report
Drusen are hallmarks of early and intermediate age-related macular degeneration (AMD) but their quantification remains a challenge. We compared automated drusen volume measurements between different OCT devices. We included 380 eyes from 200 individuals with bilateral intermediate (iAMD, nâ=â126), early (eAMD, nâ=â25) or no AMD (nâ=â49) from the MACUSTAR study. We assessed OCT scans from Cirrus (200âĂâ200 macular cube, 6âĂâ6 mm; Zeiss Meditec, CA) and Spectralis (20°âĂâ20°, 25 B-scans; 30°âĂâ25°, 241 B-scans; Heidelberg Engineering, Germany) devices. Sensitivity and specificity for drusen detection and differences between modalities were assessed with intra-class correlation coefficients (ICCs) and mean difference in a 5 mm diameter fovea-centered circle. Specificity wasâ>â90% in the three modalities. In eAMD, we observed highest sensitivity in the denser Spectralis scan (68.1). The two different Spectralis modalities showed a significantly higher agreement in quantifying drusen volume in iAMD (ICC 0.993 [0.991â0.994]) than the dense Spectralis with Cirrus scan (ICC 0.807 [0.757â0.847]). Formulae for drusen volume conversion in iAMD between the two devices are provided. Automated drusen volume measures are not interchangeable between devices and softwares and need to be interpreted with the used imaging devices and software in mind. Accounting for systematic difference between methods increases comparability and conversion formulae are provided. Less dense scans did not affect drusen volume measurements in iAMD but decreased sensitivity for medium drusen in eAMD
Influence of the shoot density of Halodule wrightii Ascherson from rocky and sandy habitats on associated macroalgal communities
Labour market institutions, insider power and informal employment in Brazilian wage determination 1980-1993
SIGLEAvailable from British Library Document Supply Centre-DSC:DXN006301 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Currency substitution and indexed money
The paper tests the hypothesis that the presence of indexed money may rule out a process of currency substitution in contexts of persistent high inflation. Estimates for the case of Brazil using monthly data for the period 1985 to 1993 and cointegration techniques offer support for that