15 documents found, page 1 of 2
Energy extraction from bouncing geometries
Cardoso, V.; Costa, J. L.; Natário, J.; Zhong, Z.Quantum gravity phenomenology suggests the interesting possibility that black holes are not eternal. Collapse could be halted by some unknown mechanism, or Hawking radiation might leave behind a regular spacetime. Here we investigate a simple bouncing geometry, with (outer and inner) apparent horizons but no event horizon. We show that the inner horizon blueshifts radiation, which can lead to a gigantic amplifi...
GESTOs da Jean: Jeangando por um texto em processo, com muitas mãos, memórias, ...
Zea, E.; Dawsey, J.; Hartmann, L.; Raposo, P.; Head, S.; Cardoso, V.; Vedana, V.Este texto é como um palimpsesto que foi escrito para a Jean a partir de vários lugares, vários momentos, várias inspirações – muitas destas foram se sobrepondo, mas deixaram rastros. Talvez pudéssemos pensar nele como um brinde a ela, por meio de pequenas e grandes coisas que nos tocam, ecos de nossos encontros. Fizemos uma reunião virtual para falar sobre o que e como escreveríamos sobre a Jean e o Grupo de E...
Addendum to “Strong cosmic censorship: The nonlinear story”
Luna, R.; Zilhão, M.; Cardoso, V.; Costa, J. L.; Natário, JWe clarify a number of issues that arise when extending the analysis of strong cosmic censorship (SCC) to perturbations of highly charged Reissner-Nordström de Sitter (RNdS) spacetimes. The linear stability of the Cauchy horizon can be determined from the spectral gap of quasinormal modes, thus giving a clear idea of the ranges of parameters that are likely to lead to SCC violations for infinitesimally small pe...
Physically active bioreactors for tissue engineering applications
Castro, N.; Ribeiro, Sylvie Oliveira; Fernandes, M. M.; Ribeiro, C.; Cardoso, V.; Correia, V.; Minguez, R.; Lanceros-Méndez, S.Tissue engineering (TE) is a strongly expanding research area. TE approaches require biocompatible scaffolds, cells, and different applied stimuli, which altogether mimic the natural tissue microenvironment. Also, the extracellular matrix serves as a structural base for cells and as a source of growth factors and biophysical cues. The 3D characteristics of the microenvironment is one of the most recognized key ...
Electric field array detector for millimeter wave assistance on brain tumor res...
Cardoso, V.; Dinis, Hugo Daniel Costa; Mendes, P. M.One of the problems associated with brain cancer resection surgeries is the difficulty in distinguishing the tumor from brain parenchyma. Therefore, it is important to find new methods that increase the resection degree, reducing tumor recurrence. Human tissues have a frequency-specific response and laboratory measurements have been demonstrated to detect tumors using low frequency waves. With the use of electr...
Strong cosmic censorship: the nonlinear story
Luna, R.; Zilhão, M.; Cardoso, V.; Costa, J. L.; Natário, JA satisfactory formulation of the laws of physics entails that the future evolution of a physical systemshould be determined from appropriate initial conditions. The existence of Cauchy horizons in solutionsof the Einstein field equations is therefore problematic and expected to be an unstable artifact of generalrelativity. This is asserted by the strong cosmic censorship conjecture, which was recently put into...
Brain tumor modeling and resection limits using millimeter wavelengths
Cardoso, V.; Dinis, Hugo Daniel Costa; Mendes, P. M.Brain cancer is a disease that affects people worldwide. One of the problems of this cancer is the low resection degree during surgery due to the difficulty in distinguishing the tumor of the brain parenchyma. Therefore, is important to find new methods that increase the resection degree and, as consequence, the cancer cure, reducing the tumor recurrence. A new method proposes the use of electromagnetic waves i...
A importância da permeabilidade na avaliação do desempenho de sistemas de venti...
Cardoso, V.; Ramos, N.; Almeida, R.; Almeida, Manuela Guedes deA permeabilidade da envolvente é um parâmetro fundamental na avaliação do desempenho energético dos edifícios, uma vez que permite avaliar as trocas de ar não controladas. O parâmetro mais utilizado para quantificar a permeabilidade é o número de renovações horárias para um diferencial de pressão de 50 Pa (n50), que pode ser determinado experimentalmente com recurso a uma porta ventiladora. No âmbito do Regulam...
Genetic analysis of feet and leg conformation traits in nelore cattle
Vargas, G. [UNESP]; Neves, H. H.R.; Cardoso, V.; Munari, D. P. [UNESP]; Carvalheiro, R. [UNESP]Made available in DSpace on 2018-12-11T17:12:36Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-01-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Feet and leg conformation scores are important traits in beef cattle because they encompass a wide ran...
Xylo-oligosaccharides display a prebiotic activity when used to supplement whea...
Ribeiro, T.; Cardoso, V.; Ferreira, L. M. A.; Lordelo, M. M. S.; Coelho, E.; Moreira, A. S. P.; Domingues, M. R. M.; Coimbra, M. A.; Bedford, M. R.It is now well established that exogenous β-1,4-xylanases improve the nutritive value of wheat-based diets for poultry. Among other factors, the mechanism of action of exogenous enzymes may involve a microbial route resulting from the generation of prebiotic xylo-oligosaccharides (XOS) in the birds' gastro-intestinal (GI) tract. In a series of three experiments, the effect of XOS on the performance of broilers ...