5,063 research outputs found
Numerical Range and the Dynamics of a Rational Function
Sometimes we obtain attractive results when associating facts to simple
elements. The goal of this work is to introduce a possible alternative in the
study of the dynamics of rational maps
Aegithus clavicornis (Linnaeus) (Coleoptera: Erotylidae) in the Dominican Republic
Establishment of fungus beetles (Coleoptera: Erotylidae) in new isolated countries is rare. We report Aegithus clavicornis (Linnaeus) for the first time from the Dominican Republic, representing the first true record for this genus from the Greater Antilles
Projective Analytic Vectors and Infinitesimal Generators
We establish the notion of a ``projective analytic vector'', whose defining
requirements are weaker than the usual ones of an analytic vector, and use it
to prove generation theorems for one-parameter groups on locally convex spaces.
More specifically, we give a characterization of the generators of strongly
continuous one-parameter groups which arise as the result of a projective limit
procedure, in which the existence of a dense set of projective analytic vectors
plays a central role. An application to strongly continuous Lie group
representations on Banach spaces is given, with a focused analysis on concrete
algebras of functions and of pseudodifferential operators.Comment: 21 pages. arXiv admin note: text overlap with arXiv:1906.0793
Environmental assessment of sardine (Sardina pilchardus) purse seine fishery in Portugal with LCA methodology including biological impact categories.
Purpose: The purse seine fishery for sardine is the most important fishery in Portugal. The aim of the present study is to assess the environmental impacts of sardine fished by the Portuguese fleet and to analyse a number of variables such as vessel size and time scale. An additional goal was to incorporate fishery-specific impact categories in the case study.\ud
Methods: Life CycleAssessmentmethodologywas applied, and\ud
data were collected from nine vessels, which represented around 10 % of the landings. Vessels were divided into two length categories, above and below 12 m, and data were obtained for the years 2005 to 2010. The study was limited to the fishing phase only. The standard impact categories included were energy use, global warming potential, eutrophication potential, acidification potential and ozone depletion potential. The fishery specific impact categories were overfishing, overfishedness, lost potential yield, mean trophic level and the primary production required, and were quantified as much as possible.\ud
Results and discussion: The landings from the data set were\ud
constituted mainly by sardine (91 %), and the remainders wereother small pelagic species (e.g. horse mackerel). The most important input was the fuel, and both vessel categories had the same fuel consumption per catch 0.11 l/kg. Average greenhouse gas emissions (carbon footprint) were 0.36 kg CO2 eq. per kilo sardine landed. The fuel use varied between years, and variability between months can be even higher. Fishing mortality has increased, and the spawning stock biomass has decreased resulting in consequential overfishing for 2010. A correlation between fuel use and stock biomass was not found, and the stock condition does not seem to directly influence the global warming potential in this fishery. Discards were primarily nontarget small pelagic species, and there was also mortality of target species resulting from slipping. The seafloor impact was considered to be insignificant due to the fishing method.\ud
Conclusions: The assessment of the Portuguese purse seine fishery resulted in no difference regarding fuel use between large and small vessels, but differences were found between years. The stock has declined, and it has produced below maximum sustainable yield. By-catch and discard data were missing but may be substantial. Even being difficult to quantify, fishery impact categories complement the environmental results with biological information and precaution is need in relation to the stock management. The sardine carbon footprint from Portuguese purse seine was lower than that of other commercial species reported in
Exploring dynamic lighting, colour and form with smart textiles
This paper addresses an ongoing research, aiming at the development of smart
textiles that transform the incident light that passes through them – light transmittance – to
design dynamic light without acting upon the light source. A colour and shape change
prototype was developed with the objective of studying textile changes in time; to explore
temperature as a dynamic variable through electrical activation of the smart materials and
conductive threads integrated in the textile substrate; and to analyse the relation between textile
chromic and morphologic behaviour in interaction with light. Based on the experiments
conducted, results have highlighted some considerations of the dynamic parameters involved in
the behaviour of thermo-responsive textiles and demonstrated design possibilities to create
interactive lighting scenarios.This work is supported by FEDER funds through the Operational Programme for Competitiveness Factors – COMPETE and National Funds through FCT – Foundation for Science and Technology within the scope of the projects SFRH/BD/87196/2012, POCI-01-0145-FEDER-007136 and UID/CTM/00264. The authors also like to acknowledge Smart Textiles Design Lab for the support on the prototype development.info:eu-repo/semantics/publishedVersio
Neutrinos and Nucleosynthesis in Supernova
The type II supernova is considered as a candidate site for the production of
heavy elements. The nucleosynthesis occurs in an intense neutrino flux, we
calculate the electron fraction in this environment.Comment: RevTex4 style, 3 pages including 1 figure. Presented at Mexican
School of Astrophysics 2002, Guanajuato, Mexico, 31 Jul - 7 Aug 2002. Final
version to appear in the Proceedings of IX Mexican Workshop on Particles and
Fields Physics Beyond the Standard Model, Colima Col. Mexico, November 17-22,
200
Nonketotic Hyperglycinemia: A Report of Two Infants Treated with Dextromethorphan and Sodium Benzoate
A hiperglicinémia não cetótica é um erro inato da degradação da glicina, resultando na sua excessiva acumulação nos tecidos
corporais, designadamente no sistema nervoso central. Trata-se de uma doença muito grave e uma das terapêuticas recentemente propostas consiste na associação do dextrometorfano com o
benzoato de sódio em altas doses. Admite-se a possibilidade de o dextrometorfano bloquear o complexo-canal receptor de N-metil-D-aspartato, implicado na toxicidade da hiperglicinémia ao nÃvel do cérebro e de o benzoato reduzir os nÃveis de glicina, pela sua conjugação e eliminação como hipurato.
Relatamos dois casos clÃnicos de crianças com hiperglicinémia não cetótita, actualmente com mais de 15 meses de idade, as quais foram medicadas com dextrometorfano e benzoato de sódio
desde as primeiras semanas após o parto. Não obstante se ter verificado sobrevivência para além do perÃodo neonatal e aquisição de autonomia respiratória, a evolução neurológica, até à data, não tem sido satisfatória, porventura devido ao atraso no inÃcio da
terapêutica
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