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Search Results: 1 - 10 of 6409 matches for " Luciana Pranzetti; Rios "
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Condi??es sanitárias e socioambientais em Iauaretê, área indígena em S?o Gabriel da Cachoeira, AM
Giatti,Leandro Luiz; Rocha,Aristides Almeida; Toledo,Renata Ferraz de; Barreira,Luciana Pranzetti; Rios,Leonardo; Pelicioni,Maria Cecília Focesi; Mutti,Luciane Viero; Cutolo,Silvana Audrá;
Ciência & Saúde Coletiva , 2007, DOI: 10.1590/S1413-81232007000600032
Abstract: objective: to describe sanitary, social and environmental conditions that are significant for health of residents in the iauaretê indigenous area in brazilian amazonia, notable for its population concentration. method: qualitative and quantitative methodologies were used, with the action research method deployed mainly for qualitative approaches, through community meetings with tribespeople and researchers in the villages constituting the hub of the area. talking maps were prepared and interviews were conducted, together with studies of solid wastes disposal techniques, in addition to locating, sampling and analyzing the quality of water used for human consumption, in parallel to the use of geo-referencing techniques. results: of the 65 water samples analyzed, 89.2% presented fecal coliforms, with no adequate sanitary solutions found for the disposal of solid wastes. from the public health standpoint, the sanitary practices of these indigenous peoples caused concern, clashing with their own relative knowledge. conclusions: the specific set of problems associated with the way of life imposed by mainstream society requires the implementation of joint activities in the infra-structure and health education fields in order to solve collective health issues, stressing local community participation.
Prevalência de parasitos intestinais e aspectos socioambientais em comunidade indígena no Distrito de Iauaretê, Município de S?o Gabriel da Cachoeira (AM), Brasil
Rios, Leonardo;Cutolo, Silvana Audrá;Giatti, Leandro Luiz;Castro, Mário de;Rocha, Aristides Almeida;Toledo, Renata Ferraz de;Pelicioni, Maria Cecília Focesi;Barreira, Luciana Pranzetti;Santos, Jéferson Gaspar dos;
Saúde e Sociedade , 2007, DOI: 10.1590/S0104-12902007000200008
Abstract: the iauaretê district is the second largest human concentration centre in the municipality of s?o gabriel da cachoeira, state of amazonas. situated in alto rio negro indigenous land, on the border between brazil and colombia, iauaretê aggregates ten villages, encompassing 15 ethnic cultures. this indigenous district has been undergoing a process of progressive transformation from a disperse and riparian occupation pattern into a settlement with urban features, with approximately 2,700 inhabitants, triggering public health problems. aiming to investigate the distribution of the prevalence of intestinal parasites in the local population and to discuss the relation between this health indicator and socio-environmental aspects in the iauaretê district, the quality of the drinking water was analyzed and parasitological exams of excreta and soil samples were conducted. of the total of analyzed water samples, 89.2% showed positive result for thermotolerant coliforms. the dom bosco village was the one presenting the highest prevalence index in excreta samples, with 76% of the individuals infested. the s?o josé village presented the lowest index (56%). the most prevalent parasites were, in decreasing order: ascaris lumbricoides (64.84%), entamoeba coli (32.58%), endolimax nana (14.84%), and blastoyistis hominis (13.39%). the most significant prevalences of parasites in soil samples were ascaris sp eggs (52.6%), entamoeba coli cysts (52.6%) and hookworms larvae (52.6%). in conclusion, high indexes of intestinal parasitism in the population, together with lack of basic sanitation and maintenance of traditional sanitary practices are matters of concern in the public health area.
Usinas de compostagem do Estado de S?o Paulo: qualidade dos compostos e processos de produ??o
Barreira, Luciana Pranzetti;Philippi Junior, Arlindo;Rodrigues, Mario Sergio;
Engenharia Sanitaria e Ambiental , 2006, DOI: 10.1590/S1413-41522006000400012
Abstract: this paper discusses the quality of msw compost produced in the composting plants in operation in sao paulo state/brazil, in regard to their physical and chemical aspects. samples were collected twice (winter/2003 and summer/2004) in fourteen plants. the evaluated plants had different structure, therefore it was necessary a previous separation of the data in similar groups, so that they would make statistical sense. the groups were: dano plants; plants with rounding sieves; plants with grounders or mills; and plants without post-treatment of the composted material. it was possible to observe that there is a direct relation between the structure of the composting plants and the quality of the compost, the nutrients rate, the levels of heavy metals and the percentage of contaminants.
Radiation from quantum weakly dynamical horizons in LQG
Daniele Pranzetti
Physics , 2012, DOI: 10.1103/PhysRevLett.109.011301
Abstract: Using the recent thermodynamical study of isolated horizons by Ghosh and Perez, we provide a statistical mechanical analysis of isolated horizons near equilibrium in the grand canonical ensemble. By matching the description of the dynamical phase in terms of weakly dynamical horizons with this local statistical framework, we introduce a notion of temperature in terms of the local surface gravity. This provides further support to the recovering of the semiclassical area law just by means of thermodynamical considerations. Moreover, it allows us to study the radiation process generated by the LQG dynamics near the horizon, providing a quantum gravity description of the horizon evaporation. For large black holes, the spectrum we derive presents a discrete structure which could be potentially observable and might be preserved even after the inclusion of all the relevant transition lines.
Geometric temperature and entropy of quantum isolated horizons
Daniele Pranzetti
Physics , 2013, DOI: 10.1103/PhysRevD.89.104046
Abstract: By reintroducing Lorentz invariance in canonical loop quantum gravity, we define a geometrical notion of temperature for quantum isolated horizons. This is done by demanding that the horizon state satisfying the boundary conditions be a Kubo-Martin-Schwinger state. The exact formula for the temperature can be derived by imposing the reality conditions in the form of the linear simplicity constraints for an imaginary Barbero-Immirzi parameter. Thus, our analysis reveals the connection between the analytic continuation to the Ashtekar self-dual variables and the thermality of the horizon. The horizon thermal equilibrium state can then be used to compute both the entanglement and the Boltzmann entropies. We show that the two provide the same finite answer, which allows us to recover the Bekenstein-Hawking formula in the semi-classical limit. In this way, we shed new light on the microscopic origin of black hole entropy by revealing the equivalence between the near-horizon degrees of freedom entanglement proposal and the state-counting interpretation. The connection with the Connes-Rovelli thermal time proposal for a general relativistic statistical mechanics is worked out.
Dynamical evaporation of quantum horizons
Daniele Pranzetti
Physics , 2012, DOI: 10.1088/0264-9381/30/16/165004
Abstract: We describe the black hole evaporation process driven by the dynamical evolution of the quantum gravitational degrees of freedom resident at the horizon, as identified by the loop quantum gravity kinematics. Using a parallel with the Brownian motion, we interpret the first law of quantum dynamical horizon in terms of a fluctuation-dissipation relation. In this way, the horizon evolution is described in terms of relaxation to an equilibrium state balanced by the excitation of Planck scale constituents of the horizon. This discrete quantum hair structure associated to the horizon geometry produces a deviation from thermality in the radiation spectrum. We investigate the final stage of the evaporation process and show how the dynamics leads to the formation of a massive remnant, which can eventually decay. Implications for the information paradox are discussed.
2+1 gravity with positive cosmological constant in LQG: a proposal for the physical state
Daniele Pranzetti
Physics , 2011, DOI: 10.1088/0264-9381/28/22/225025
Abstract: In this paper, I investigate the possible quantization, in the context of LQG, of three dimensional gravity in the case of positive cosmological constant {\Lambda} and try to make contact with alternative quantization approaches already existing in the literature. Due to the appearance of an anomaly in the constraints algebra, previously studied as a first step of the analysis, alternative techniques developed for the quantization of systems with constraints algebras not associated with a structure Lie group need to be adopted. Therefore, I introduce an ansatz for a physical state which gives some transition amplitudes in agreement with what one would expect from the Turaev-Viro model. Moreover, in order to check that this state implements the right dynamicss, I show that it annihilates the master constraint for the theory up to the first order in {\Lambda}.
Static Isolated Horizons: SU(2) Invariant Phase Space, Quantization, and Black Hole Entropy
Alejandro Perez,Daniele Pranzetti
Entropy , 2011, DOI: 10.3390/e13040744
Abstract: We study the classical field theoretical formulation of static generic isolated horizons in a manifestly SU(2) invariant formulation. We show that the usual classical description requires revision in the non-static case due to the breaking of diffeomorphism invariance at the horizon leading to the non-conservation of the usual pre-symplectic structure. We argue how this difficulty could be avoided by a simple enlargement of the field content at the horizon that restores diffeomorphism invariance. Restricting our attention to static isolated horizons we study the effective theories describing the boundary degrees of freedom. A quantization of the horizon degrees of freedom is proposed. By defining a statistical mechanical ensemble where only the area aH of the horizon is fixed macroscopically—states with fluctuations away from spherical symmetry are allowed—we show that it is possible to obtain agreement with the Hawkings area law ( S = aH /(4l 2 p)) without fixing the Immirzi parameter to any particular value: consistency with the area law only imposes a relationship between the Immirzi parameter and the level of the Chern-Simons theory involved in the effective description of the horizon degrees of freedom.
On the regularization of the constraints algebra of Quantum Gravity in 2+1 dimensions with non-vanishing cosmological constant
Alejandro Perez,Daniele Pranzetti
Physics , 2010, DOI: 10.1088/0264-9381/27/14/145009
Abstract: We use the mathematical framework of loop quantum gravity (LQG) to study the quantization of three dimensional (Riemannian) gravity with positive cosmological constant (Lambda>0). We show that the usual regularization techniques (successful in the Lambda=0 case and widely applied in four dimensional LQG) lead to a deformation of the classical constraint algebra (or anomaly) proportional to the local strength of the curvature squared. We argue that this is an unavoidable consequence of the non-local nature of generalized connections.
Perfil clínico e eletrorretinográfico da como??o retiniana
Noia, Luciana da Cruz;Berezovsky, Adriana;Freitas, Denise de;Sacai, Paula Yuri;Salom?o, Solange Rios;
Arquivos Brasileiros de Oftalmologia , 2006, DOI: 10.1590/S0004-27492006000600020
Abstract: purpose: to investigate clinical, anatomic and electroretinographic changes in eyes that suffered blunt ocular trauma with commotio retinae. methods: patients who presented commotio retinae after unilateral blunt ocular trauma less then 72 hours before were submitted to visual acuity testing, biomicroscopy, binocular indirect ophthalmoscopy, fluorescein angiography, optical coherence tomography and full-field electroretinography. full-field erg was repeated after 15 and 30 days. results: sixteen patients were included in the study. on the first examination there was a statistically significant difference between affected and fellow eye in all response amplitudes, without b/a ratio alteration, and a delay in single-flash cone response and 30-hz flicker implicit time. on the second examination, the difference between the eyes remained for oscillatory potentials, but disappeared on the last examination. in fluorescein angiography, all patients presented mottled hyperfluorescence and hypofluorescent areas, due to alterations in the pigment barrier. on optical coherence tomography, we found optically empty spaces at the site of the lesion. conclusion: found changes suggested photoreceptor and ganglion cells, but not müller cell functional alterations, as well as pigment mobilization. these changes disappeared 30 days after the trauma.
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