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Teixeira, P.F.,Ferreira, P.A.,Pita, A. Lopez,Casas, C.,Bachiller, A. The Korean Society for Railway 2009 International Journal of Railway Vol.2 No.1
The development of structural solutions for high-speed or very high-speed tracks that minimize total life cycle costs of the system is a key issue to improve the operational profitability of new investments. In opposition to conventional ballasted tracks, slab track solutions can be a cost-effective solution, but only in the cases where the benefits due to the increase in track availability and the reduction of track maintenance offsets its much higher construction costs. In the cases where such investment is not feasible, it is worth to evaluate possible structural improvements to ballasted track that allow reducing its maintenance needs without increasing too much its construction costs. This paper evaluates the design requirements and the impact of improving conventional high-speed ballasted tracks by using a bituminous subballast layer. It is divided into two main parts: first the design requirements of the structural solutions with bituminous subballast and its possible benefits on high-speed track deterioration, and secondly the evaluation of the economic impact, in terms of construction costs, of using this structural solution material in future Spanish high-speed lines.
Xin Xiangjun,António Luís Jesus Teixeira,Paulo P. Monteiro,José R. F. da Rocha,Paulo Sérgio de Brito André 한국전자통신연구원 2005 ETRI Journal Vol.27 No.3
The transmission performance of optical labeling based on a combined frequency shift keying/amplitude shift keying (FSK/ASK) format is studied by numerical simulation. The simulation demonstrates that the bit-error ratio (BER) characteristic of an ASK signal is limited by the extinction ratio, received optical power, and dispersion, simultaneously. However, an FSK signal is mainly limited by the extinction ratio (ER) and received optical power when the peak spectrum, which is used to detect the FSK signal, is relatively narrow.
Paulo S. André,Ant?io L. Teixeira,Armando N. Pinto,Lara P. Pellegrino,Berta B. Neto,J?e F Rocha,Jo? L. Pinto,Paulo N. Monteiro 한국전자통신연구원 2006 ETRI Journal Vol.28 No.2
In this letter, we will evaluate the performance degradation of a 40 km high-speed (40 Gb/s) optical system, induced by optical fiber variations of the chromatic dispersion induced by temperature changes. The chromatic dispersion temperature sensitivity will be estimated based on the signal quality parameters.
Identification of Secreted Virulence Factors of Chromobacterium violaceum
Thiago Castro-Gomes,Santuza M. R. Teixeira,Mariana S. Cardoso,Wanderson D. DaRocha,Letícia A. Laibida,Andréa M. A. Nascimento,Luciana W. Zuccherato,Maria Fátima Horta,Marcelo P. Bemquerer 한국미생물학회 2014 The journal of microbiology Vol.52 No.4
Chromobacterium violaceum, a component of tropical soilmicrobiota, is an opportunistic pathogenic bacterium thatcan infect humans and other animals. In addition to identifyinga large number of genes that demonstrate the vast biotechnologicalpotential of this bacterium, genome sequencingrevealed several virulence factors, including different cytolysins,which can be related to its pathogenicity. Here weconfirmed these predictions from genomic analyses by identifying,through mass spectrometry, proteins present in theculture supernatant of C. violaceum that may constitute secretedvirulence factors. Among them, we identified a secretedcollagenase and the product of a gene with sequence similarityto previously characterized bacterial porins.
P. Teixeira,J.M.A. Cesar de Sa,A.D. Santos,F.M.A. Pires,A. Barata da Rocha 한국소성가공학회 2010 기타자료 Vol.2010 No.6
This article presents an integrated approach for localized necking and failure prediction in sheet metal forming processes, based on the coupling between the anisotropic damage evolution law proposed by Lemaitre [1] and the modified maximum force criterion (MMFC) proposed by Hora et al [2]. To illustrate the essential features of the coupled approach, an aluminum alloy has been selected and numerical predictions have been compared with experimental forming limits, obtained for both linear strain paths evolutions. Numerical results show that the introduction of the softening behavior, caused by the increase of damage, into the necking criterion can play a significant role in triggering local necking, providing an improved prediction of the necking occurrence together with the capability of performing calculations of limit strains when they are governed by fracture rather than by local necking.
José M. Marques,P.M. Carreira,J.E. Marques,H.I. Chaminé,P.E. Fonseca,F.A. Monteiro Santos,H.G.M. Eggenkamp,J. Teixeira 한국지질과학협의회 2010 Geosciences Journal Vol.14 No.4
The aim of this paper is to review the results of the assessment of low-temperature geothermal resources (issue temperatures between 41 and 77℃) that occur in the Portuguese mainland. For this purpose, a multidisciplinary approach, including geologic, tectonic, geochemical, geophysical and isotopic (2H, 18O, 13C, 3H and 14C) techniques, was applied in order to update local and/or regional conceptual circulation models. Three case studies of N-Portugal are presented and discussed. This paper describes different low-temperature geothermal waters presenting similar hydrogeological conceptual models but rather different geochemical signatures (e.g., HCO3–Na with pH 8, HCO3/Na/CO2-rich with pH 7 and HCO3–Na with pH 9, type waters). In fact, in the studied low-temperature geothermal systems, local/regional high altitude sites associated with highly fractured rocks play an important role in conducting the infiltrated meteoric waters towards the discharge zones near the Spas. The discharge zones are mainly related to the intersection of major regional fault lineaments (and conjugate structures), responsible for creating the mineral waters ascent. In some cases, geochemical and isotopic data point out to the existence of anthropogenic contamination of some geothermal spring waters related to the intense use of fertilizers in areas of widespread agricultural practices