15 documents found, page 1 of 2
Irreversible temperature indicator based cellulose membranes conjugated with le...
Carvalho, Margarida; Tavares, Ana P. M.; Marques. Maria A.; Alves, Joaquim J.; Figueira, Joana; Morais, Maria; Pinto, Joana V.; Moreira, Felismina T. C.This research focuses on the development of thermochromic membranes made of cellulose acetate (CA) for temperature monitoring of sensitive food products. Two dual TC membranes developed for the control of different temperature ranges were formulated using a three-component system: a leuco-dye membrane (crystal violet lactone, CVL) integrated with an acidic membrane containing the color developer (salicylic acid...
Irreversible colorimetric bio-based curcumin bilayer membranes for smart food p...
Pereira, Ariane; Marques, Maria A.; Alves, Joaquim; Morais, Maria; Figueira, Joana; Pinto, Joana V.; Moreira, Felismina T. C.; Moreira, FelisminaResearch into innovative food safety technologies has led to the development of smart packaging with embedded chemical sensors that can monitor food quality throughout the supply chain. Thermochromic materials (TM), which are able to dynamically change colour in response to temperature fluctuations, have proven to be reliable indicators of food quality in certain environments. Natural colourants such as curcumi...
Irreversible temperature indicator based cellulose membranes conjugated with le...
Carvalho, Margarida; Tavares, Ana P. M.; Marques, Maria A.; Alves, Joaquim J.; Figueira, Joana; Morais, Maria; Pinto, Joana V.; Moreira, Felismina T. C.This research focuses on the development of thermochromic membranes made of cellulose acetate (CA) for temperature monitoring of sensitive food products. Two dual TC membranes developed for the control of different temperature ranges were formulated using a three-component system: a leuco-dye membrane (crystal violet lactone, CVL) integrated with an acidic membrane containing the color developer (salicylic acid...
Irreversible colorimetric bio-based curcumin bilayer membranes for smart food p...
Pereira, Ariane; Marques, Maria A.; Alves, Joaquim; Morais, Maria; Figueira, Joana; Pinto, Joana V.; Moreira, FelisminaResearch into innovative food safety technologies has led to the development of smart packaging with embedded chemical sensors that can monitor food quality throughout the supply chain. Thermochromic materials (TM), which are able to dynamically change colour in response to temperature fluctuations, have proven to be reliable indicators of food quality in certain environments. Natural colourants such as curcumi...
Composites based on PDMS and graphite flakes for thermoelectric sensing applica...
Figueira, Joana; Vieira, E. M. F; Loureiro, Joana; Correia, J. H.; Fortunato, Elvira; Martins, Rodrigo; Pereira, Luís[Excerpt] Thermoelectric (TE) devices are utilized for thermal energy harvesting, local cooling or heating, and temperature sensing. They have no mechanical structures, can be made flexible and present long operating lifetimes, making them useful for the Internet of Things (IoT) and wearable electronics.[...]
The strengths and weaknesses of live fluorescently labelled algae (LFLA) to est...
Ferreira, Guilherme Duarte; Figueira, Joana; Marques, Sónia Cotrim; Hansen, Per Juel; Calbet, AlbertThe Live Fluorescently Labelled Algae (LFLA) technique has been used numerous times to estimate microzooplankton herbivory. Yet, it is unknown how mixoplankton (i.e., single-cell organisms that can combine phototrophy and phagotrophy) affect the outcome of this technique. Hence, we conducted a broad-spectrum assessment of the strengths and weaknesses of the LFLA technique, using several mixoplanktonic and proto...
Enhanced thermoelectric properties of Sb<inf>2</inf>Te<inf>3</inf> and Bi<inf>2...
Vieira, E. M. F; Figueira, Joana; Pires, Ana L.; Grilo, José; Silva, Manuel Fernando Ribeiro; Pereira, André M.; Gonçalves, L. M.Improved thermoelectric properties of p-Sb2Te3 and n-Bi2Te3 films deposited by thermal co-evaporation at 503 K and 543 K, respectively, are reported, by using two types of substrate (borosilicate glass and 25 μm - Kapton® polyimide). Seebeck coefficients of 194 μV K−1 and - 233 μV K−1 and electrical conductivities of 3.2 × 104 (Ω m)−1 and 5.0 × 104 (Ω m)−1, lead to optimized power factors of 1.2 × 10−3 W K−2 m−...
Bi2Te3 and Sb2Te3 Thin Films with Enhanced Thermoelectric Properties for Flexib...
Vieira, Eliana Maria Fernandes; Figueira, Joana; Pires, Ana Lucia; Grilo, José; Silva, Manuel Fernando Ribeiro; Pereira, André Miguel; Gonçalves, L. M.The influence of substrate type in boosting thermoelectric properties of co-evaporated Bi2Te3 and Sb2Te3 films (with 400 nm-thick) is here reported. Optimized power factor values are 2.7 × 10<sup>−3</sup> W K<sup>−2</sup> m<sup>−1</sup> and 1.4 × 10<sup>−3</sup> W K<sup>−2</sup> m<sup>−1</sup> for flexible Bi2Te3 and Sb2Te3 films, respectively. This is an important result as it is at least 2 times higher than t...
Transporte automóvel de lactentes e crianças. Conhecimentos e atitudes de mães ...
Martins, Sara; Gouveia, Raquel; Sandes, Ana Rita; Correia, Susana; Nascimento, Catarina; Figueira, Joana; Valente, Sandra; Rocha, EvangelistaIntrodução: Os acidentes rodoviários são a principal causa de morte e incapacidade infantil em Portugal. A utilização dos sistemas de retenção adequados no transporte automóvel de recém-nascidos, lactentes e crianças contribui para a diminuição de lesões em caso de acidente. Objectivos: Determinar os conhecimentos e respectiva fonte de informação das puérperas sobre transporte automóvel de recém-nascidos e cria...
A Consulta de Adolescentes de um Hospital Central Universitário: Análise Casuís...
Fonseca, Helena; Pereira, Carla; Mendes, Leonor; Valente, Sandra; Figueira, JoanaOs adolescentes são um grupo à partida saudável e que recorre pouco aos serviços de saúde. Na adolescência, apesar de a morbilidade ser elevada, a mortalidade é baixa. Os desenvolvimentos físico, emocional e psicológico que caracterizam a adolescência, fazem parte de um percurso cheio de oportunidades mas também com alguns riscos. Os pediatras podem ter um papel de relevo na ajuda ao adolescente para que se man...