Search Results - "Hevia, D Fernandez"

Efficient and affordable hydrogen production by water photo-splitting using TiO2-based photocatalysts by PULIDO MELIAN, E, GONZALEZ DIAZ, O, ORTEGA MENDEZ, A, LOPEZ, Cristina R, NEREIDA SUAREZ, M, DONA RODRIGUEZ, J. M, NAVIO, J. A, FERNANDEZ HEVIA, D, PEREZ PENA, J

“…TiO2-based photocatalyst materials were synthesized through a sol–gel method, followed either by: (1) hydrothermal treatment (150 °C/24 h), or (2) heat…”
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Production of hydrogen by water photo-splitting over commercial and synthesised Au/TiO2 catalysts by Mendez, JAOrtega, Lopez, Cristina R, Melian, EPulido, Diaz, OGonzalez, Rodriguez, JMDona, Hevia, DFernandez, Macias, M

“…•The SG750 photocatalyst at 2.0wt.% Au gave the highest H2 production yield per unit of surface area.•The highest production of H2 was obtained with the…”
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Hydrogen production using Pt-loaded TiO2 photocatalysts by PULIDO MELIAN, E, LOPEZ, Cristina R, ORTEGA MENDEZ, A, GONZALEZ DIAZ, O, NEREIDA SUAREZ, M, DONA RODRIGUEZ, J. M, NAVIO, J. A, FERNANDEZ HEVIA, D

“…A series of synthesised TiO2-based and commercial photocatalysts were modified by Pt photodeposition and a study made of their photocatalytic activity in…”
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Dominance of deep over shallow donors in ZnO-based varistors by Fernández-Hevia, D., de Frutos, J., Caballero, A. C., Fernández, J. F.

“…Broadband admittance spectroscopy measurements of ZnO-based varistors are analyzed in terms of charge transport theory through double Schottky barriers, hence…”
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Bulk Grain Resistivity of ZnO-Based Varistors by Caballero, A. C., Hevia, D. Fern ndez, Frutos, J. de, Peiteado, M., Fern ndez, J. F.

“…We study the temperature dependence of grain resistivity in ZnO ceramic varistors (300-430 K), finding a positive temperature coefficient (PTC). We devise a…”
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Bulk-grain resistivity and positive temperature coefficient of ZnO-based varistors by Fernández-Hevia, D., de Frutos, J., Caballero, A. C., Fernández, J. F.

“…We analyze the conditions that allow the bulk-grain regions of a polycrystalline semiconductor to be explored through electrical measurements. The temperature…”
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Wide range dielectric spectroscopy of ZnO-based varistors as a function of sintering time by Fernández-Hevia, D., Peiteado, M., de Frutos, J., Caballero, A.C., Fernández, J.F.

“…Broadband electrical response analysis and charge transport theory through double Schottky barriers in ceramic semiconductors, are both used in order to…”
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Nonlinear I-V electrical behaviour of doped CaCu3Ti4O12 ceramics by LERET, P, FERNANDEZ, J. F, DE FRUTOS, J, FEMANDEZ-HEVIA, D

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Dominance of deep over shallow donors and the non-Debye response of ZnO-based varistors by Fernández Hevia, D., Caballero, A.C., de Frutos, J., Fernández, J.F.

“…Broadband admittance spectroscopy measurements of ZnO-based varistors are analyzed in terms of charge transport theory through double Schottky barriers, hence…”
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Production of hydrogen by water photo-splitting over commercial and synthesised Au/TiO sub(2) catalysts by Mendez, J A Ortega, Lopez, Cristina R, Melian, E Pulido, Diaz, O Gonzalez, Rodriguez, J M Dona, Hevia, D Fernandez, Macias, M

“…H sub(2) production from methanol/water photo-splitting was compared using various commercial photocatalysts (Evonik P25 (P25), Hombikat UV-100 (HB) and Kronos…”
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Soft solution fluorine-free synthesis of anatase nanoparticles with tailored morphology by Calatayud, David G., Jardiel, Teresa, Rodríguez, Mónica, Peiteado, Marco, Fernández-Hevia, Daniel, Caballero, Amador C.

“…TiO2 nanoparticles with tailored morphology have been synthesized under exceptionally soft conditions. The strategy is based on the use of a non-aqueous…”
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Microstructure Engineering to Drastically Reduce the Leakage Currents of High Voltage ZnO Varistor Ceramics by Peiteado, Marco, Reyes, Yhasmin, Cruz, Ana M., Calatayud, David G., Fernandez-Hevia, Daniel, Caballero, Amador C.

“…The energetic losses associated with the leakage currents can represent a serious problem for the efficient performance of ZnO‐based varistor ceramics…”
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Transanal Total Mesorectal Excision for Rectal Cancer: Outcomes after 140 Patients by Lacy, Antonio M., MD, PhD, Tasende, Marta M., MD, Delgado, Salvadora, MD, PhD, Fernandez-Hevia, María, MD, Jimenez, Marta, MD, PhD, De Lacy, Borja, MD, Castells, Antoni, MD, PhD, Bravo, Raquel, MD, Wexner, Steven D., MD, PhD, FACS, Heald, Richard J., MD, PhD, FACS

“…Background The anatomic difficulties that we have to deal with in open surgery for rectal cancer have not been overcome with the laparoscopic approach. In the…”
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Nonlinear I– V electrical behaviour of doped CaCu 3Ti 4O 12 ceramics by Leret, P., Fernandez, J.F., de Frutos, J., Fernández-Hevia, D.

“…In this work a comparative study of undoped CaCu 3Ti 4O 12 (CCTO) and doped with Fe 3+(CCTOF) and Nb 5+(CCTON) ceramics, was aimed to modify the electronic…”
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Control microestructural en varistores cerámicos basados en el sistema ZnO-Bi2O3-Sb2O3 dopados con TiO2 by Fernández-Hevia, D., Reyes, Y., Gallego, B., Cruz, A. M., Peiteado, M.

“…Typically Titanium oxide is added to the formulation of Bi2O3-doped ZnO based varistors to enhance the growth of ZnO grains, thus allowing their application in…”
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Preparación de Materiales Fotocatalizadores Basados en Bi4Ti3O12 Dopados con Metales de Transición by Jardiel, T., Fernández-Hevia, D., Gallego, B., Rodríguez, M., Calatayud, D. G.

“…The production of hydrogen from water using ceramic semiconductors with photocatalytic properties has gained special relevance in the last years, due to their…”
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Transanal vs Laparoscopic Total Mesorectal Excision for Rectal Cancer: Comparison of the 2-Year Follow-up by de Lacy, Francisco B., MD, Fernandez-Hevia, Maria, MD, del Gobbo, Gabriel Díaz, MD, Jiménez-Toscano, Marta, MD, PhD, Bravo, Raquel, MD, Momblán, Dulce, MD, Delgado, Salvadora, MD, PhD, Lacy, Antonio M., MD, PhD, FASCRS(Hon)

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Espectroscopia de admitancias de banda ancha aplicada al control microestructural de propiedades eléctricas en varistores cerámicos by Fernández Hevia, D., Caballero, A. C., de Frutos, J., Fernández, J. F.

“…In the present work, the theory of charge transport through active interfaces is used to study the electronic properties of ZnO-based varistors. It has been…”
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