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Search Results: 1 - 10 of 341 matches for " Rossano Gimenes "
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Uso das técnicas de infravermelho e de ressonancia magnética nuclear na caracteriza??o da rea??o ácido-base de um cimento odontológico experimental
Bertolini, Marcio José;Zaghete, Maria Aparecida;Gimenes, Rossano;
Química Nova , 2009, DOI: 10.1590/S0100-40422009000500028
Abstract: glass ionomer cements (gics) are products of the acid-base setting reaction between an finely fluoro-alumino silicate glass powder and poly(acrylic acid) in aqueous solution. the sol gel method is an adequate route of preparation of the glasses used to obtain the gics. the objective of this paper was to compare two powders: a commercial and an experimental and to investigate the structural changes during hardening of the cements by ftir and al mas nmr. these analyses showed that the experimental glass powder reacted with organic acid to form the gics and it is a promising material to manufacture dental cements.
TiO2/CuO Films Obtained by Citrate Precursor Method for Photocatalytic Application  [PDF]
Leinig Perazolli, Luciana Nu?ez, Milady Renata Apolinário da Silva, Guilherme Francisco Pegler, Ademir Geraldo Cavalarri Costalonga, Rossano Gimenes, Márcia Matiko Kondo, Maria Aparecida Zaghete Bertochi
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.26075
Abstract: In the present work, the hybrid catalyst films of TiO2/CuO containing up to 10% in mol of copper were deposited onto glass surface. Precursor solutions were obtained by citrate precursor method. Films were porous and the average particle size was 20 nm determined by FEG-SEM analysis. The photocatalytic activities of these films were studied using Rhodamine B as a target compound in a fixed bed reactor developed in our laboratory and UV lamp. It was observed that the addition of copper to TiO2 increased significantly its photocatalytic activity during the oxidation of Rhodamine B. The degradation exceeded 90% within 48 hours of irradiation compared to 38% when pure TiO2 was used. Moreover, there was a reduction in the particles band gap energy when compared to that of pure TiO2. These results indicate that the TiO2/CuO films are promising catalysts for the development of fixed bed reactors to be used to treat effluents containing azo dyes.
Option Pricing with Stochastic Volatility  [PDF]
Rossano Giandomenico
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.312189
Abstract: The study analyses some problems arising in stochastic volatility models by using Ito’s lemma and its applications to boundary Cauchy problem by giving the solution of vanilla option pricing models satisfying the partial differential equation obtained by assuming stochastic volatility in replication problems and risk neutral probability.
Caracteriza o de cimento odontológico obtido a partir de um vidro preparado pelo método dos precursores poliméricos
Bertolini Marcio José,Zaghete Maria Aparecida,Gimenes Rossano,Paiva-Santos Carlos de Oliveira
Química Nova , 2005,
Abstract: Glass ionomer cements are glass and polymer composite materials. These materials currently find use in dentistry. The purpose of this work is to obtain glass powders based on the composition 4.5SiO2 - 3Al2O3 - 2CaO to be used in dentistry. The powders were prepared by a chemical route at 700 0C. The properties of glass ionomer cements obtained from powders prepared at 700 oC were studied. Diametral tensile strength and microhardness were evaluated for the experimental glass ionomer cements and a commercial material. It was concluded that the properties of experimental cements were similar to those of the commercial ones.
Caracteriza??o de cimento odontológico obtido a partir de um vidro preparado pelo método dos precursores poliméricos
Bertolini, Marcio José;Zaghete, Maria Aparecida;Gimenes, Rossano;Paiva-Santos, Carlos de Oliveira;Palma-Dibb, Regina Guenka;
Química Nova , 2005, DOI: 10.1590/S0100-40422005000500016
Abstract: glass ionomer cements are glass and polymer composite materials. these materials currently find use in dentistry. the purpose of this work is to obtain glass powders based on the composition 4.5sio2 - 3al2o3 - 2cao to be used in dentistry. the powders were prepared by a chemical route at 700 0c. the properties of glass ionomer cements obtained from powders prepared at 700 oc were studied. diametral tensile strength and microhardness were evaluated for the experimental glass ionomer cements and a commercial material. it was concluded that the properties of experimental cements were similar to those of the commercial ones.
Niilismo e ética: notas sobre Derrida e Nacy
Pecoraro, Rossano
Veritas , 2007,
Abstract: Este artigo pretende investigar algumas dimens es da filosofia de Jacques Derrida e Jean-Luc Nancy em rela o aos temas do niilismo, da ética e da política. This article aims to investigate some dimensions of Jacques Derrida’s and Jean- Luc Nancy’s philosophy in reference to the themes of nihilism, ethics and politics.
Interaction between visiting bees (Hymenoptera, Apoidea) and flowers of Ludwigia elegans (Camb.) hara (Onagraceae) during the year in two different areas in S?o Paulo, Brazil
Gimenes, M.;
Brazilian Journal of Biology , 2003, DOI: 10.1590/S1519-69842003000400008
Abstract: this study was designed to characterize the interactions between ludwigia elegans flowers and visiting bees during two years in two areas 200 km apart, at the same latitude (approximately 22o48's) but at different altitudes (alumínio, 600 m, and campos do jord?o, 1500 m), in the state of s?o paulo, brazil. as these flowers open simultaneously in the morning and lose their petals by sunset, interaction with bees occurs only during the photophase. flowers of l. elegans were mainly visited by bees, the most frequent species being: tetraglossula anthracina (michener, 1989) (colletidae), rhophitulus sp. (andrenidae), and pseudagapostemon spp. (halictidae), all considered specialized bees for collecting pollen and nectar from these flowers, as well as the generalist bee apis mellifera linnaeus, 1758 (apidae). the specialist bees were temporally adjusted to the opening schedule of the flower, which occurs primarily in the morning, but shows a circannual variation. t. anthracina appears in both study areas, but only between december and april. the annual activity patterns of these specialist bees are synchronized to the phenology of l. elegans. photoperiod and temperature cycles are suggested as the main synchronizers of both bees and plants.
Poliniza??o de Vochysia lucida C. Presl (Vochysiaceae) em uma área de restinga na Bahia
Gimenes, Miriam;
Revista Brasileira de Entomologia , 2007, DOI: 10.1590/S0085-56262007000400010
Abstract: vochysia species are neotropical and present flowers that can be visited by bees, hummingbirds, and butterflies. this study aimed to analyze the interactions between the flowers of vochysia lucida and their floral visitors in an area of restinga in bahia state, brazil. v. lucida is an arborescent species and presents inflorescences of the type raceme, with about 100 to 170 flowers. the flowers are zygomorphic, yellow-coloured, and considered mellitophilous. the floral nectar is produced and stored in the spur, which is localized at the calyx. the flowering peak of v. lucida was in november and december. all through the study the flowers opened at 6 h., when the stigma was already receptive. at flower opening the anther was already not more present and the pollen grains were deposited in the wall of the style, occurring secondary presentation of pollen. petals dropped in the end of the afternoon about 17:00 h. the hummingbirds, although frequent in the flowers of v. lucida, were considered as opportunistic visitors. among the recorded floral visitors, the large bees were regarded the most efficient pollinators, especially xylocopa frontalis, because it has suitable morphology and behavior to contact the reproductive structures of the flower, during nectar collections, and for its high visiting frequency.
Interactions between bees and Ludwigia elegans (Camb.) Hara (Onagraceae) flowers at different altitudes in S?o Paulo, Brazil
Gimenes, Miriam;
Revista Brasileira de Zoologia , 2002, DOI: 10.1590/S0101-81752002000300005
Abstract: populations of ludwigia elegans (carnb.) hara were examined in aluminio (600m) and campos do jord?o (1520m), in the state of s?o paulo. flowers of both populations are self-incompatible and dependent on bees for pollination. flowers of ludwigia elegans at the aluminio site were visited by about 30 different species of bees, and those at campos do jord?o by 10. these results can be related to climatic differences at the two sites, especially temperature, due to their difference in altitude. inspite of the difference in the absolute number of bee species seen at each site, tetraglossula anthracina (michener, 1989) (colletidae) can be considered a specialized and efficient pollinator in both areas, since it visited these flowers frequently and showed many morphological and behavioral adaptations for pollen and nectar collection.
Interaction between visiting bees (Hymenoptera, Apoidea) and flowers of Ludwigia elegans (Camb.) hara (Onagraceae) during the year in two different areas in S o Paulo, Brazil
Gimenes M.
Brazilian Journal of Biology , 2003,
Abstract: This study was designed to characterize the interactions between Ludwigia elegans flowers and visiting bees during two years in two areas 200 km apart, at the same latitude (approximately 22o48'S) but at different altitudes (Alumínio, 600 m, and Campos do Jord o, 1500 m), in the State of S o Paulo, Brazil. As these flowers open simultaneously in the morning and lose their petals by sunset, interaction with bees occurs only during the photophase. Flowers of L. elegans were mainly visited by bees, the most frequent species being: Tetraglossula anthracina (Michener, 1989) (Colletidae), Rhophitulus sp. (Andrenidae), and Pseudagapostemon spp. (Halictidae), all considered specialized bees for collecting pollen and nectar from these flowers, as well as the generalist bee Apis mellifera Linnaeus, 1758 (Apidae). The specialist bees were temporally adjusted to the opening schedule of the flower, which occurs primarily in the morning, but shows a circannual variation. T. anthracina appears in both study areas, but only between December and April. The annual activity patterns of these specialist bees are synchronized to the phenology of L. elegans. Photoperiod and temperature cycles are suggested as the main synchronizers of both bees and plants.
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