14 documents found, page 1 of 2
Quasiclassical study of a termolecular reaction: a more detailed description of...
Mogo, César; Brandão, João; Wang, Wenli; Coelho, Daniela; Rio, CarolinaWe present detailed studies of the collisional stabilization of the HO*2 radical in a mixture of hydrogen atoms and oxygen molecules using molecular dynamic studies and accurate potential energy surfaces. Following previous work on this process's global temperature and pressure dependencies, we analyze each collider's role and estimate specific rate constants and their temperature dependence.
Quasiclassical study of a termolecular reaction: Application to the HO2 collisi...
Mogo, César; Brandão, João; Wang, Wenli; Coelho, Daniela; Rio, CarolinaWe present a multiprocess reaction dynamics program to study the termination reaction H + O-2 + M -> HO2 + M, one main uncertainty source in hydrogen combustion studies. We simulate the behavior of a mixture of hydrogen atoms and oxygen molecules at different conditions of temperature and pressure, using classical mechanics and accurate Potential Energy Surfaces. In this simulation we treat all the reaction cha...
Learning Mathematics in Supervised Teaching Practice in educational context COV...
Moreira, Catarina; Fernandes, Dárida; Coelho, DanielaThe sudden change in society that came from the new pandemic context COVID-19 changed the educational and social paradigm. So, it was necessary to adapt the management of resources and knowledge acquired on the teaching and learning process in a continuous and asynchronous way with students in the new context of Distance Learning, in the initial training of teachers. In this new paradigm, it is imperative to di...
Experimental and theoretical studies of the gas-phase reactions of O(1D) with H...
Hickson, Kevin; Bhowmick, Somnath; Suleimanov, Yury; Brandão, João; Coelho, DanielaHere we report the results of an experimental and theoretical study of the gas-phase reactions between O($^1$D) and H$_2$O and O($^1$D) and D$_2$O at room temperature and below. On the experimental side, the kinetics of these reactions have been investigated over the 50-127 K range using a continuous flow Laval nozzle apparatus, coupled with pulsed laser photolysis and pulsed laser induced fluorescence for the ...
Carbon Monoxide and Cyanide Intoxication: An Association to Remember
Marçal, Ana Luísa; Coelho, Daniela; Araújo, RuiCarbon monoxide and cyanide are toxins that induce cellular hypoxia; both can be produced in the context of domestic fires and may have a synergistic effect. We present the case of a man, victim of a house fire, who was initially diagnosed as having carbon monoxide poisoning, but that afterwards also presented signs and symptoms compatible with cyanide poisoning. He was successfully treated with an antidote. We...
The ‘Awakening to Languages’ approach at preschool: developing children’s commu...
Coelho, Daniela; Andrade, Ana Isabel; Portugal, GabrielaThis article reports a study which examined the effects of an Awakening to Languages (AtL) programme on preschool children’s language abilities. This programme aimed at exposing children to language and cultural diversity as well as promoting positive attitudes towards different languages and cultures amongst children. However, considering that the AtL approach also intends to encourage language learning, it ha...
Some issues relating to the painted furniture of the 18th century in Madeira is...
Coelho, DanielaWithin the study of painted furniture in Portugal of the 18th century, this article focuses its presence in the island of Madeira. Some specifi cs, such as the artistic production, ordering, technical study and current conservation condition are addressed. In this sense, is presented the study of two polychromatic oratories, with portuguese workshop production.; Dentro del estudio de muebles pintados en Portuga...
Aspectos do mobiliário pintado setecentista na ilha da Madeira
Coelho, DanielaNo âmbito do estudo do móvel pintado em Portugal na centúria de setecentos, o presente artigo pretende abordar a sua presença na Ilha da Madeira. Caracterizam-se, assim,determinadas especificidades de produção artística, encomenda, estudo técnico e estado de conservação actual. Neste sentido, é apresentado o estudo de caso de dois oratórios policromados, de produção oficinal portuguesa.; Within the study of pai...
Sigmatropic rearrangements in 5-allyloxytetrazoles
Frija, L.; Reva, I. D.; Ismael, Amin; Coelho, Daniela; Fausto, R.; Cristiano, Maria Lurdes SantosMechanisms of thermal isomerization of allyl tetrazolyl ethers derived from the carbocyclic allylic alcohols cyclohex-2-enol and 3-methylcyclohex-2-enol and from the natural terpene alcohol nerol were investigated. In the process of the syntheses of the three 1-aryl-5-allyloxytetrazoles, their rapid isomerization to the corresponding 1-aryl-4-allyltetrazol-5-ones occurred. The experiments showed that the imidat...
Conservação e restauro de um objecto histórico: a Galeota Real de D. João VI
Coelho, DanielaThe displacement of the Royal Portuguese family to Brazil in 1808 became a significant event responsible for a deep change in the Portuguese colony way of living. The vessel Galeota Real, property of King D. João VI of Portugal, also known as Galeota Imperial, was a gift to the King just to be used exclusively on royal ceremonies. An intervention of conservation and restoration of all its elements in gilded car...