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Search Results: 1 - 10 of 16438 matches for " Pinto Neto "
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Quantum cosmology: how to interpret and obtain results
Pinto-Neto, Nelson;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000200014
Abstract: we argue that the copenhagen interpretation of quantum mechanics cannot be applied to quantum cosmology. among the alternative interpretations, we choose to apply the bohm-de broglie interpretation of quantum mechanics to canonical quantum cosmology. for minisuperspace models, we show that there is no problem of time in this interpretation, and that quantum effects can avoid the initial singularity, create inflation and isotropize the universe. for the general case, it is shown that, irrespective of any regularization or choice of factor ordering of the wheeler-dewitt equation, the unique relevant quantum effect which does not break spacetime is the change of its signature from lorentzian to euclidean. the other quantum effects are either trivial or break the four-geometry of spacetime. a bohm-de broglie picture of a quantum geometrodynamics is constructed, which allows the investigation of these latter structures.
Síndrome de POEMS (mieloma osteoesclerótico)
Pinto Neto, Jorge V.;
Revista Brasileira de Hematologia e Hemoterapia , 2007, DOI: 10.1590/S1516-84842007000100018
Abstract: poems syndrome is a unique clinical entity defined by the presence of a monoclonal plasma cell disorder, peripheral neuropathy, and other paraneoplastic features such as organomegaly, endocrinopathy, skin changes, papilledema, sclerotic bone lesions, extravascular volume overload. not all features of the disease are required to make the diagnosis, and early recognition is important to reduce morbidity. other names for the syndrome include ostesclerotic myeloma, crow-fukase syndrome, or takatsuki syndrome. the median survival of patients with poems syndrome is superior to those with multiple myeloma (165 and 38 months, respectively), independent of the number of presenting features, bone lesions, or plasma cells at diagnosis. there is no standard treatment for this disorder, the mainstays of therapy for patients with poems include irradiation, corticosteroids, and alkylator-based therapy, including high-dose chemotherapy with peripheral blood stem cell transplantation.
O ensino da cirurgia para alunos de gradua o
Guilherme Pinto Bravo Neto
Revista do Colégio Brasileiro de Cirurgi?es , 2000, DOI: 10.1590/s0100-69912000000500001
Abstract:
Saúde, educa o e o nosso grande irm o
Guilherme Pinto Bravo Neto
Revista do Colégio Brasileiro de Cirurgi?es , 2002, DOI: 10.1590/s0100-69912002000200001
Abstract:
Indexa o e responsabilidade Indexation and responsibility
Guilherme Pinto Bravo Neto
Revista do Colégio Brasileiro de Cirurgi?es , 2004, DOI: 10.1590/s0100-69912004000400001
Abstract:
Quantum cosmology: how to interpret and obtain results
Pinto-Neto Nelson
Brazilian Journal of Physics , 2000,
Abstract: We argue that the Copenhagen interpretation of quantum mechanics cannot be applied to quantum cosmology. Among the alternative interpretations, we choose to apply the Bohm-de Broglie interpretation of quantum mechanics to canonical quantum cosmology. For minisuperspace models, we show that there is no problem of time in this interpretation, and that quantum effects can avoid the initial singularity, create inflation and isotropize the Universe. For the general case, it is shown that, irrespective of any regularization or choice of factor ordering of the Wheeler-DeWitt equation, the unique relevant quantum effect which does not break spacetime is the change of its signature from lorentzian to euclidean. The other quantum effects are either trivial or break the four-geometry of spacetime. A Bohm-de Broglie picture of a quantum geometrodynamics is constructed, which allows the investigation of these latter structures.
Large classical universes emerging from quantum cosmology
Nelson Pinto-Neto
Physics , 2009, DOI: 10.1103/PhysRevD.79.083514
Abstract: It is generally believed that one cannot obtain a large Universe from quantum cosmological models without an inflationary phase in the classical expanding era because the typical size of the Universe after leaving the quantum regime should be around the Planck length, and the standard decelerated classical expansion after that is not sufficient to enlarge the Universe in the time available. For instance, in many quantum minisuperspace bouncing models studied in the literature, solutions where the Universe leave the quantum regime in the expanding phase with appropriate size have negligible probability amplitude with respect to solutions leaving this regime around the Planck length. In this paper, I present a general class of moving gaussian solutions of the Wheeler-DeWitt equation where the velocity of the wave in minisuperspace along the scale factor axis, which is the new large parameter introduced in order to circumvent the abovementioned problem, induces a large acceleration around the quantum bounce, forcing the Universe to leave the quantum regime sufficiently big to increase afterwards to the present size, without needing any classical inflationary phase in between, and with reasonable relative probability amplitudes with respect to models leaving the quantum regime around the Planck scale. Furthermore, linear perturbations around this background model are free of any transplanckian problem.
The Bohm Interpretation of Quantum Cosmology
Nelson Pinto-Neto
Physics , 2004, DOI: 10.1007/s10701-004-2012-8
Abstract: I make a review on the aplications of the Bohm-De Broglie interpretation of quantum mechanics to quantum cosmology. In the framework of minisuperspaces models, I show how quantum cosmological effects in Bohm's view can avoid the initial singularity, isotropize the Universe, and even be a cause for the present observed acceleration of the Universe. In the general case, we enumerate the possible structures of quantum space and time.
Lightning Enhancement in the Amazon Region Due to Urban Activity  [PDF]
Osmar Pinto Jr., Iara Regina Cardoso de Almeida Pinto, Osmar P. Neto
American Journal of Climate Change (AJCC) , 2013, DOI: 10.4236/ajcc.2013.24026
Abstract:

Urbanization has an increasing contribution to anthropogenic climate forcing. The impact arises mainly from the Urban Heat Island (UHI) effect and aerosol anthropogenic emissions. An important but not completely understood consequence of this forcing is its effect on local lightning activity. Changes in lightning activity may result in a feedback on the climate system. In this article, it investigates changes in the lightning activity in the city of Manaus, located in the Amazon region of Brazil. It is found that, over the city, the lightning activity is larger than in the regions around it and it has been increasing in the last four decades simultaneously with the increasing of its urban area. Our results suggest that such changes are caused by the UHI effect. The observations reported here are unique and relevant because Manaus is located in the central part of the Amazon rainforest and inside one of the three global lightning chimneys in the world.

Química e literatura na forma o de professores
Pedro da Cunha Pinto Neto
Educa??o : Teoria e Prática , 2012,
Abstract: This paper is focused on teacher training in chemistry and its multiple dimensions as well as the role played by the representations of chemistry and chemists in influencing their training. The intention here is to develop some ideas related to the diffusion of scientific knowledge and the representations in the chemistry field, considering the literary creation as reference, especially texts where chemistry and chemists appear as elements of confabulation. Finally, there are two examples inspired by some important works published in the nineteenth century, that show us how some stereotypes related to chemists have been developed, how they influence the representations of chemists and why chemistry has been seen as a “mad science”.
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