2,508 research outputs found
Calibração de um sistema de modelação para o estuário do Guadiana
Com a entrada em funcionamento da barragem do
Alqueva o regime de caudais no rio Guadiana irá ser
alterado. Actualmente a albufeira do Alqueva encontra-se
em fase de enchimento sendo garantido um caudal mínimo
de 5 a 10m3/s que passa para o estuário. Neste cenário
torna-se importante conhecer o comportamento das
principais variáveis físicas que caracterizam o estuário do
Guadiana, nomeadamente níveis, correntes salinidade e
transito de sedimentos. Neste artigo utiliza-se o sistema de
modelação MOHID, efectuando-se a calibração do modelo
para as medidas de campo disponíveis. Esta tarefa insere-se
num trabalho de modelação mais amplo de caracterização
do Guadiana do ponto de vista hidrodinâmico e de
transporte de propriedades
MOHID as a tool to evaluate the impact of water discharge from dams on the advection of estuarine fish larval stages
The impoundment of rivers by dams is the biggest direct anthropogenic impact on the
hydrological cycle. The utility of dams, as providers of water for human consumption,
irrigation and electrical production, is undeniable. However, the price to pay, weighting benefits versus ecological impacts caused by dams, is enormous and often questionable. The deleterious ecological impacts caused by dams are detected at the dam’s site are and at hundreds of kilometers downstream from dams, even in estuaries and coastal areas. The uncontrolled water discharge from dams, both high volumes of water and inappropriate timing, compromise fish recruitment because eggs are flushed from estuarine spawning and nursery areas. Thus, our goal was to develop an hydrodynamic modelling approach that evaluates the impact of water discharge from dams on the advection of fish larval stages off estuaries and into coastal areas. This goal was accomplished by merging the abundance of anchovy eggs along the Guadiana estuary in MOHID
The Kite Latissimus Dorsi Flap for Breast Reconstruction: An Attempt to Reduce Lateral Chest Wall Deformity and Axillary Bulking
The latissimus dorsi flap is a commonly used tissue transfer for volume replacement in partial or total breast reconstruction. In this era of cosmetic awareness and oncoplastic breast surgery, two main defects are related to the conventional technique: the back scar and the bulkiness on the lateral chest wall, under the axilla. Axillary bulking, a disturbing defect for the majority of patients, is a persistent consequence, independent of the technique used, even when the proximal tendon is cut. We describe a new approach, the kite latissimus dorsi flap, consisting of harvesting the flap, partially or totally, with pedicle dissection from the muscle, extending dissection, perforator style if needed, until the external border of the breast (anterior axillary line) is reached. The muscle is then cut at that level, leaving no unnecessary volume under the axilla, which would cause bulkiness and chest wall deformity.info:eu-repo/semantics/publishedVersio
The Mechanical Behavior of a 25Cr Super Duplex Stainless Steel at Elevated Temperature
Peer reviewedPostprin
Preparation of robust polyamide microcapsules by interfacial polycondensation of p-phenylenediamine and sebacoyl chloride and plasticization with oleic acid
Microcapsules produced by interfacial polycondensation of p-phenylenediamine (PPD) and sebacoyl chloride (SC) were studied. The products were characterized in terms of morphology, mean diameter and effectiveness of dodecane encapsulation. The use of Tween 20 as dispersion stabilizer, in comparison with polyvinyl alcohol (PVA), reduced considerably the mean diameter of the microcapsules and originated smoother wall surfaces. When compared to ethylenediamine (EDA), microcapsules produced with PPD monomer were more rigid and brittle, prone to fracture during processing and ineffective retention of the core liquid. The use of diethylenetriamine (DETA) cross-linker in combination with PPD did not decrease capsule fragility. On the other hand, addition of a small fraction of oleic acid to the organic phase remarkably improved wall toughness and lead to successful encapsulation of the core-oil. Oleic acid is believed to act as a plasticizer. Its incorporation in the polymeric wall was demonstrated by FTIR and (1)H-NMR.This work was funded by FEDER funds through the Operational
Programme for Competitiveness Factors (COMPETE), ON.2 – O Novo
Norte – North Portugal Regional Operational Programme and National
Funds through Foundation for Science and Technology (FCT) under the projects: PEst-C/EQB/UI0511, NORTE-07-0124-FEDER-000026 – RL1_ Energy and PTDC/CTM-NAN/119979/2010. The Bruker Avance III 400 spectrometer is part of the National NMR network and was purchased under the framework of the National Programme for Scientific Reequipment, REDE/1517/RMN/2005, with funds from POCI 2010 (FEDER) and (FCT). Joana R. Góis acknowledges FCT-MCTES for her PhD scholarship (SFRH/BD/69635/2010)
Direct and Inverse Variational Problems on Time Scales: A Survey
We deal with direct and inverse problems of the calculus of variations on
arbitrary time scales. Firstly, using the Euler-Lagrange equation and the
strengthened Legendre condition, we give a general form for a variational
functional to attain a local minimum at a given point of the vector space.
Furthermore, we provide a necessary condition for a dynamic
integro-differential equation to be an Euler-Lagrange equation (Helmholtz's
problem of the calculus of variations on time scales). New and interesting
results for the discrete and quantum settings are obtained as particular cases.
Finally, we consider very general problems of the calculus of variations given
by the composition of a certain scalar function with delta and nabla integrals
of a vector valued field.Comment: This is a preprint of a paper whose final and definite form will be
published in the Springer Volume 'Modeling, Dynamics, Optimization and
Bioeconomics II', Edited by A. A. Pinto and D. Zilberman (Eds.), Springer
Proceedings in Mathematics & Statistics. Submitted 03/Sept/2014; Accepted,
after a revision, 19/Jan/201
Structural differences on cell wall polysaccharides of brewer's spent Saccharomyces and microarray binding profiles with immune receptors
Funding Information: This work was financial supported by FCT - Fundação para a Ciência e a Tecnologia , I.P. within the project “Yeast4FoodMed” ( POCI-01-0145-FEDER-030936 and PTDC/BAA-AGR/30936/2017 ) and LAQV/REQUIMTE ( UIDB/50006/2020 and UIDP/50006/2020 ) through national funds and, where applicable, co-financed by the FEDER , within the PT2020 Partnership Agreement. This work was also financed by national funds from FCT , in the scope of the project UIDP/04378/2020 and UIDB/04378/2020 of the Research Unit on Applied Molecular Biosciences - UCIBIO and the project LA/P/0140/2020 of the Associate Laboratory Institute for Health and Bioeconomy - i4HB. Rita Bastos ( PD/BD/114579/2016 ), Viviana G. Correia ( PD/BD/105727/2014 ) and Angelina S. Palma ( PTDC/BIA-MIB/31730/2017 ) were supported by FCT . Elisabete Coelho (CDL-CTTRI-88-ARH/2018 - REF. 049-88-ARH/2018 ) and Benedita Pinheiro thank the research contracts funded by FCT through program DL 57/2016 – Norma transitória. Publisher Copyright: © 2022 The AuthorsBrewing practice uses the same yeast to inoculate the following fermentation (repitching). Saccharomyces pastorianus, used to produce Lager beer, is widely reused, not changing its fermentation performance. However, S. cerevisiae, used to produce Ale beer, is partial or not even reused, due to its poor performance. It is hypothesized that cells modulate their wall polysaccharides to increase the cell-wall strength. In this work industrial S. cerevisiae and S. pastorianus brewer's spent yeasts with different repitching numbers were studied. Glucans were the main component of S. cerevisiae whereas mannoproteins were abundant in S. pastorianus. The major changes were noticed on glucans of both species, β1,3-glucans decrease more pronounced in S. cerevisiae. The increase of α1,4-Glc, related with osmotolerance, was higher in S. cerevisiae while β1,4-Glc, related with cell-wall strength, had a small increase. In addition, these structural details showed different binding profiles to immune receptors, important to develop tailored bioactive applications.publishersversionpublishe
NSCC -- A New Scheme of Classification of C-rich Stars Devised from Optical and Infrared Observations
A new classification system for carbon-rich stars is presented based on an
analysis of 51 AGB carbon stars through the most relevant classifying indices
available. The extension incorporated, that also represents the major advantage
of this new system, is the combination of the usual optical indices that
describe the photospheres of the objects, with new infrared ones, which allow
an interpretation of the circumstellar environment of the carbon-rich stars.
This new system is presented with the usual spectral subclasses and -, j-,
MS- and temperature indices, and also with the new SiC- (SiC/C.A. abundance
estimation) and - (opacity) indices. The values for the infrared indices
were carried out through a Monte Carlo simulation of the radiative transfer in
the circumstellar envelopes of the stars. The full set of indices, when applied
to our sample, resulted in a more efficient system of classification, since an
examination in a wide spectral range allows us to obtain a complete scenario
for carbon stars
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