Navegando por Palavras-chave "energy"

Agora exibindo 1 - 4 de 4
  • Imagem de Miniatura
    Item
    Acesso aberto (Open Access)
    Characterization of Nanocomposites for Hydrogen Storage
    (Amer Inst Physics, 2017) Oliveira, Amanda D.; Beatrice, Cesar A. G.; Passador, Fabio R. [UNIFESP]; Pessan, Luiz A.
    The use of hydrogen as an energy carrier suitable to replace gasoline and other fossil fuels has been widely discussed as a way to sustainably fuel our civilization. However, hydrogen storage is a major harrier in the establishment of infrastructure for hydrogen technology. The incorporation of nanoparticles to the polymer matrix may be an alternative to obtain materials with promising properties for hydrogen storage. in this work, polyetherimide-based Nanocomposites were prepared using carbon nanotubes doped with sodium alanate (NaAlH4) as tiller. The sodium alanate content was fixed at 30 wt% and were studied three carbon nanotubes concentrations: 5, 10 and 20 wt%. The nanocomposites were characterized by differential scanning calorimetry (DSC), thennogravimetric analysis (TGA) and Hydrogen sorption measurements.
  • Nenhuma Miniatura disponível
    Item
    Somente Metadadados
    MAJOR FOOD SOURCES OF SUGAR AND ITS ASSOCIATION WITH OBESITY AMONG COUNTRIES OF ELANS
    (Karger, 2017) Pareja, Rossina Pareja; Kovalskys, Irina; Fisberg, Mauro [UNIFESP]; Gomez Salas, Georgina; Rigotti, Attilio; Cortes, Lilia Yadira; Yepez Garcia, Martha Cecilia; Herrera-Cuenca, Marianella; Nogueira Previdelli, Agatha
  • Nenhuma Miniatura disponível
    Item
    Somente Metadadados
    Oxygen uptake during walking in patients with rheumatoid arthritis - A controlled study
    (J Rheumatol Publ Co, 2004-04-01) De Carvalho, MRP; Tebexreni, A. S.; Salles, CAF; Barros Neto, Turibio Leite de [UNIFESP]; Natour, J.; Universidade Federal de São Paulo (UNIFESP)
    Objective. To analyze the energy expenditure of patients with rheumatoid arthritis (RA) of functional classes I, II, and III during walking at different speeds on a treadmill.Methods. Thirty-five consecutive patients selected from the rheumatology outpatient clinic were studied and compared with a control group consisting of 35 healthy individuals paired for age, sex, body weight, and body mass index. An incremental test on a treadmill consistent with normal walking was developed, with metabolic analysis performed at 30 s intervals using a gas analyzer connected to a computerized system. Heart rate, rate of perceived exertion, visual analog scale of pain; Ritchie index, the Scale of the Escola Paulista de Medicina for Evaluation of Articular Movement Range, and the Health Assessment Questionnaire were also used to evaluate functional capacity.Results. Patients with RA showed a greater energy expenditure than controls at the following walking speeds: 3.0 km/h (RA = 229.36 +/- 56.47 kcal/h; controls = 197.44 +/- 52.59), 4.5 km/h (RA = 266.41 +/- 58.94 kcal/h; controls = 231.41 +/- 56.14), and 5.0 km/h (RA = 289.11 +/- 65.35 kcal/h; controls = 250.18 +/- 56.67). Patients with RA presented higher values for all test measures except heart rate. The functional class II group differed significantly from the controls, whereas the functional class I group had values close to normal.Conclusion. Patients with RA had a greater energy expenditure during walking compared to healthy controls under the same conditions, and patients with functional class II experienced a greater energy expenditure compared to controls.
  • Nenhuma Miniatura disponível
    Item
    Somente Metadadados
    Study of Thermomagnetic Energy Conversion driven by Renewable Energy
    (Ieee, 2017) Viola, Alessia [UNIFESP]; Gama, Sergio [UNIFESP]; Ferreira, Lucas D. R. [UNIFESP]; Bessa, Carlos V. X. [UNIFESP]; Trapane, Marco
    Magnetic heating, refrigeration and energy conversion have been defined very important challenges for promising environmentally future choices. Recent studies are focused attention on new thermomagnetic systems, devices working through thermomagnetic effect, driven by renewable energies. The aim of this work is a case study presentation of new thermomagnetic energy prototype coupled with renewable technologies or industrial waste heat. The paper is divided into four sections: the first gives a general state of art about magneto caloric energy conversion systems, the second describes all general thermodynamics and magnetic laws governing the process, the third and fourth sections study in more detail the case study presented.