Papers by Gismael Francisco Perin
Astrophysics and Space Science Library, 2003
Interferometric observations in the atmospheric windows of the near infrared (1 to 4 microns) can... more Interferometric observations in the atmospheric windows of the near infrared (1 to 4 microns) can be efficiently used to probe the chemical composition of Miras atmosphere and provide direct measurements of extended gas layers around these stars. This is illustrated by recent Miras observations carried out with the FLUOR instrument of the IOTA interferometer (Mennesson et al. 2002, and Perrin et al. proceedings of this conference) and with the PTI test-bed (Thompson 2002, Thompson et al. 2002). These visibility measurements show evidence for continuum emission from very extended (2-3 stellar radii) semi-transparent gaseous atmospheric layers, and large apparent diameter changes with pulsation phase. Interestingly these observations are consistent with the extended molecular gas layers (H20, CO ...) already inferred around some of these objects from I S 0 and high resolution ground-based FTS infrared spectra.
The contamination in aquatic environment, in the last decades, is undeniable. And, one of the mos... more The contamination in aquatic environment, in the last decades, is undeniable. And, one of the most important source that contributed to this contamination are industrial wastewaters. The Babitonga Bay is situated in the South of Brazil, wide 7,267.7 ha, and where there is a representative mangrove cenosys. This kind of ecosystem is very rich in benthic communities. For this reason, it is source of food for many fisherman’s communities and for population that lives in cities around it. Therefore, it receives daily, a great volume of several kinds of industrial effluents and domestic sewage. It is known that aquatic contaminated environment is responsible for many human health problems which can be generated through ingestion of water or seafood. In this sense, the study of anthropic contaminant of Babitonga Bay is important to increase the quality of life of population and, also to help to preserve this kind of ecosystem, so rich in organisms. The analysis was engaged in identificati...
Considered an important art form, a source of entertainment and a powerful method for educating, ... more Considered an important art form, a source of entertainment and a powerful method for educating, movies have great power to affect us, perceptually, cognitively and emotionally. Technological advances are making a huge amount of movies and related information available. Visualization has the potential to help handling this very interesting but complex richness. In particular, time-oriented visualization could help to capture, express, understand and effectively navigate movies along time: both the time when they were released, or viewed, and the time along which their contents are weaved, in each movie. In this paper, we present our recent work towards the inclusion of the time dimension in 2D and 3D visualizations, based on colors and tag clouds, at the movies space level, and down to the movies in an interactive web application to access, explore and visualize movies based on the information conveyed in the different tracks or perspectives of its content, especially audio and subtitles where most of the semantics is expressed. Our approach has the ultimate goal of helping finding and navigating information through interactive visualizations, and providing insights through analytical tasks or more ludic and artistic uses.
High Dynamics Infrared Imaging of Evolved Stars with FLUOR/IOTA
The high precision FLUOR beam combiner set on the IOTA interferometer allows a very accurate cali... more The high precision FLUOR beam combiner set on the IOTA interferometer allows a very accurate calibration of visibilities. As a consequence, it is very well suited to study surface structures and variations of evolved stars in the K band. We present data obtained on several stars showing departure from uniform and limb-darkened disk models and variations with time. Among them,
IR and SiO Maser Observations of Miras
Preliminary results of a coordinated program of near IR and SiO maser interferometric observation... more Preliminary results of a coordinated program of near IR and SiO maser interferometric observations of Mira variables are reported. The 2.2 and 3.6 micron results are from the FLUOR/TISIS beam combiners on the IOTA interferometer and the SiO maser observations from the VLBA. The ratio of the SiO ring diameter to the apparent diameter at 2.2 microns for stars in
International Journal of Reconfigurable Computing, 2011
This paper describes a comparison of two Montgomery modular multiplication architectures: a systo... more This paper describes a comparison of two Montgomery modular multiplication architectures: a systolic and a multiplexed. Both implementations target FPGA devices. The modular multiplication is employed in modular exponentiation processes, which are the most important operations of some public-key cryptographic algorithms, including the most popular of them, the RSA. The proposed systolic architecture presents a high-radix implementation with a one-dimensional array of Processing Elements. The multiplexed implementation is a new alternative and is composed of multiplier blocks in parallel with the new simplified Processing Elements, and it provides a pipelined operation mode. We compare thetime×areaefficiency for both architectures as well as an RSA application. The systolic implementation can run the 1024 bits RSA decryption process in just 3.23 ms, and the multiplexed architecture executes the same operation in 4.36 ms, but the second approach saves up to 28% of logical resources. T...
European Journal of Medicinal Chemistry, 2014
We describe herein our results on the synthesis and biological properties in Caenorhabditis elega... more We describe herein our results on the synthesis and biological properties in Caenorhabditis elegans of a range of 4-organylsulfenyl-7-chloroquinolines. This class of compounds have been easily synthesized in high yields by direct reaction of 4,7-dichloroquinoline with organylthiols using DMSO as solvent at room temperature under air atmosphere and tolerates a range of substituents in the organylsulfenyl moiety. We have performed a toxicological and pharmacological screening of the synthesized 4-organylsulfenyl-7-chloroquinolines in vivo in C. elegans acutely exposed to these compounds, under per se and stress conditions. Hence, we determined the lethal dose 50% (LD 50), in order to choose a nonlethal concentration (10 mM) and verified that at that concentration some of the compounds depicted protective action against the induced damage inflicted by paraquat, a superoxide generator. Two compounds (3c and 3h) reduced the toxicity inflicted by paraquat above survival, reproduction and longevity of the worms, at least in part, by reducing the reactive oxygen species (ROS) generated by the toxicant exposure. Besides, these compounds increased the quantities of superoxide dismutase (SOD-3::GFP) and catalase (CTL-1,2,3::GFP), antioxidant enzymes. We concluded that the protective effects of the compounds observed in this study might have been a hormetic response dependent of the transcriptional factor DAF-16/FOXO, causing a non-lethal oxidative stress that protects against the subsequently damage induced by paraquat.
Environmental Toxicology and Chemistry, 1996
This in vitro study provides evidence that the anionic detergent linear alkylbenzene sulfonate (L... more This in vitro study provides evidence that the anionic detergent linear alkylbenzene sulfonate (LAS) enters energized lysosomes from rat liver. Because LAS is lipophilic and negatively charged, the uptake is due to the presence of a positive inside potential induced by energization of lysosomes. This accumulation could explain some damage caused by sublethal doses of detergent in some aquatic species, as it has been found that LAS inhibits lysosomal enzymes such as acid phosphatase and alkaline phosphatase.
Heavy Metal Pollution in Central Venice Lagoon Bottom Sediments: Evaluation of the Metal Bioavailability by Geochemical Speciation Procedure
Environmental Technology, 1997
ABSTRACT Bottom sediments of the central area of the Venice Lagoon (Italy) and some lagoon canals... more ABSTRACT Bottom sediments of the central area of the Venice Lagoon (Italy) and some lagoon canals, chosen as an anaerobic reference environment, were analyzed by a sequential extraction procedure for Cr, Cu, Ni, Pb, Zn, Mn, and Fe. Bio-Available Phases (BAPs) and Non-Bio-Available Phases (NBAPs) have been determined in the Malamocco-Marghera Canal, to define the significant level of heavy metal contamination of the sediment. Relationships among metal distributions with Fe/Mn oxides/hydroxides and sulfides were determined in both environments, using statistical methods. The central lagoon area shows low pollution and a balanced influence of all the sediment components in the metal complexing processes, mostly due to the manganese and iron matrices. The inner canals are very polluted with heavy metals strongly bonded to H2S that form highly insoluble compounds, as demostrated through the correlation analysis. The authors suggest different procedures for lagoon restoration due to the different sediment behaviours, i.e., to avoid sediment turbation by dredging or by artificial bottom aeration which could result in an accelerated formation of more soluble oxygenated metal compounds making the toxic metals readily available to the aquatic environment. The sedimentological study of the central lagoon given here evidenced the correlation between grain size and mineralogical composition and heavy metal concentrations in bottom sediments. While Fe, Mn, Zn and Cu show a good correlation with the percentages of mud (grain size < 62 micron) Cr, Cd, Pb and Ni are quite independent from the grain size of the sediment.
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Papers by Gismael Francisco Perin