543 research outputs found
Lectura crítica de Mérida Jiménez, Rafael M. (ed.) (2016). Masculinidades disidentes. Barcelona: Icaria. 254 páginas
No full textFil: Insausti, Santiago Joaquín. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones Gino Germani. Buenos Aires, Argentina. - CONICET. Buenos Aires, Argentina
La Mancomunitat de les Valls. Fragilidad, paisaje y desarrollo
No full textEste libro es la continuación de la serie editada por la UPV a propuesta del Taller de Urbanismo y Paisaje. Está compuesto por cinco artículos de investigación que invitan a la reflexión sobre la necesidad de difusión de ideas sobre las estrategias de rehabilitación urbana más aconsejables, que contribuyan al desarrollo sostenible y favorezcan las formulas de intervención sobre tejidos, perfiles urbanos y espacios verdes.En definitiva, se trata de un libro que versa sobre la fragilidad, como define su título, la fragilidad de lo belloAguilar Alonso, MD.; Alonso Salvador, M.; Blasco Sánchez, MDC.; Ramón Huidobro, J.; Insausti Machinandiarena, P.; Martínez Pérez, FJ.; Vigil De Insausti, A. (2016). La Mancomunitat de les Valls. Fragilidad, paisaje y desarrollo. Editorial Universitat Politècnica de València. https://riunet.upv.es/handle/10251/74592EDITORIA
Co Doping Effects On The Magnetic And Magnetoresistance In Sm 0.35nd0.35pb0.30mn1-xco Xo3 (x = 0, 0.1, 0.2)
No full textPolycrystalline samples of the Sm0.35Nd0.35Pb 0.3Mn1-xCoxO3 (x = 0, 0.1, 0.2) at low magnetic fields has been studied by AC susceptibility, and field cooled and zero field cooled magnetisation measurements. We conclude that a small amount of Co substitution tends to destroy the double exchange and broadens the coexistence region of the cluster-glass and ferromagnetic states. Also, the Co doping suppresses the large negative magnetoresistance and it becomes small for x = 0.2. © 2001 Published by Elsevier Science B.V.226-230PART I834836Martin, C., Maignan, A., Hervieu, M., Raveau, B., (1999) Phys. Rev. B, 60, p. 1219Coey, J.M.D., Viret, L., Von Moinar, S., (1999) Adv. Phys., 48, p. 167Blanco, J.J., Lezama, L., Insausti, M., Gutierrez, J., Barandiaran, J.M., Rojo, T., (1999) Chem. Mater., 11, p. 3464Peña, A., Blanco, J.J., Insausti, M., Lezama, L., Gutierrez, J., Barandiaran, J.M., Rojo, T., (1999) J. Magn. Magn. Mater., 196-197, p. 543Mukherjee, S., Ranganathan, R., Anikumar, P.S., Joy, P.A., (1996) Phys. Rev. B, 54, p. 9267Nam, D.N.H., Jonason, K., Nordblad, P., Khiem, N.V., Phuc, N.X., (1999) Phys. Rev. B, 59, p. 418
Magnetotransport Properties Of The Sm0.35nd0.35m0.3mn1-xfexo 3 (m = Pb, Cd; X = 0, 0.1) Manganites
No full textPolycrystalline samples of the mixed-valence perovskite-type manganites Sm0.35Nd0.35M0.3Mn1-xFexO 3 (M = Pb, Cd; x = 0, 0.1) have been synthesised and their magnetic and transport properties studied. Magnetic measurements show that TC values decrease considerably with the presence of cadmium or iron. Colossal magnetoresistance has been shifted to lower temperatures. Values of magnetoresistance near to 40% have been obtained. The presence of defined maxima in the real part of ac susceptibility at the same temperature of the cusp in the zero field cooling curves corroborates cluster-glass behaviour.2201425428Von Helmolt, R., Wecker, J., Holzapfel, B., Schultz, L., Samwer, K., (1993) Phys. Rev. Lett., 71, p. 2331Jin, S., Tiefel, T.H., McCormack, M., Fastnacht, R.A., Ramesh, R., Chen, L.H., (1994) Science, 264, p. 413Tomioka, Y., Asamitsu, A., Moritomo, Y., Kuwahara, H., Tokura, Y., (1995) Phys. Rev. Lett., 74, p. 5108Zener, C., (1951) Phys. Rev., 82, p. 403Anderson, P.W., Hasegawa, H., (1955) Phys. Rev., 100, p. 675De Gennes, P.G., (1960) Phys. Rev., 118, p. 141Millis, A.J., Littlewood, P.B., Shraiman, B.I., (1995) Phys. Rev. Lett., 74, p. 5144Peña, A., Blanco, J.J., Insausti, M., Lezama, L., Gutiérrez, J., Barandiarán, J.M., Rojo, T., (1999) J. Magn. Magn. Mater., 196-197, p. 543Anil Kumar, P.S., Joy, P.A., Date, S.K., (1998) J. Phys.: Condensed Matter, 10, pp. L48
Influence of Fe in giant magnetoresistance ratio and magnetic properties of La[sub 0.7]Ca[sub 0.3]Mn[sub 1−x]Fe[sub x]O[sub 3] perovskite type compounds
No full textIn this work polycrystalline perovskite with composition La0.7Ca0.3Fe0.05Mn0.95O3 has been produced by standard ceramic method. A considerable change occurs in magnetic, transport and magnetoresistance properties with respect to the classic composition without Fe. The introduction of a different metal, Fe, in Mn-O layer causes a decrease of about 50 K in the value of T-C. In the same way, a decrease of about 10-15% in the average magnetic moment measured at 1 T is also observed. On the other hand, the introduction of Fe does not cause any appreciable change in the value of the lattice parameter. This new compound presents 60% of giant magnetoresistance ratio at 200 K. Magnetization vs. temperature measurements in zero field cooling and field cooling show clear differences at applied fields below 80 km(-1). Such a behavior, also observed in La0.7Ca0.3MnO3 sample, is not recognizable as a simple ferromagnetic one. A qualitative discussion of the effect in the magnetic and transport properties of these compounds, caused by the substitution of some Mn atoms by Fe is given
Magnetic properties and magnetoresistance of Bi and Fe substituted manganites
No full textIn this work structure, magnetic and transport properties of La-0.7 (\) Bi\Ca0.3MnO3 (0.05 less than or equal to x less than or equal to 0.7). La0.7Pb0.3Mn1-x-Fe\O3 and La0.7Sr0.3Mn1-xFeO3 (0 less than or equal to x less than or equal to 0.3) manganites have been studied. Competition between ferromagnetic and antiferromagnetic interactions has been observed giving rise to complex magnetic behaviour, including metamagnetism and spin glass features. Such features art: interpreted as arising from the weakening of the double exchange mechanism, of ferromagnetic character. as a consequence of the substitutions. In the case of Bi substituted compounds the covalent character of Si strongly localizes the hopping electron. while the Fe substitution destroys the double exchange mechanism by the change in energy levels of the Fe4+ ions with respect to the Mn4+ ones
Lectura crítica de Mérida Jiménez, Rafael M. (ed.) (2016). Masculinidades disidentes. Barcelona: Icaria. 254 hojas.
No full textReview of Mérida Jiménez, Rafael M. (ed.) (2016). Masculinidades disidentes. Barcelona: Icaria.Lectura crítica de Mérida Jiménez, Rafael M. (ed.) (2016). Masculinidades disidentes. Barcelona: Icaria. 254 hoja
Olive oil consumption is associated with a lower risk of cardiovascular disease and stroke
No full textFIS grants 17/1709, 20/144, PI20/00564 and PIE16/00022 (Instituto de Salud Carlos III, State Secretary of R+D+I, and FEDER/FSE), PNSD (2020/021), the CIBERESP, the CIBERCV and CIBEROBN (Instituto de Salud Carlos III).Donat-Vargas, C., Sandoval-Insausti, H., Peñalvo, J.L., Moreno Iribas, M.C., Amiano, P., Bes-Rastrollo, M., Molina-Montes, E., Moreno-Franco, B., Agudo, A., Mayo, C.L., Laclaustra, M., De La Fuente Arrillaga, C., Chirlaque Lopez, M.D., Sánchez, M.-J., Martínez-Gonzalez, M.A., Pilar, G.-C
Fluorination And Deoxygenation As Chemical Tools To Study The Conformational Preferences Of Hexopyranoses: A Journey From Gas Phase To Solution
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The 3D-arrangement of carbohydrates and, particularly, the orientation of their hydroxymethyl groups are structural features crucial for their biological activities. In this work, we investigate the influence of water on the conformational preferences of model hexopyranoses by performing a comprehensive analysis in the gas phase via microwave spectroscopy\footnote{C. Calabrese, I. Uriarte, A. Insausti, M. Vallejo-Lopez, F. J. Basterretxea, S. A. Cochrane, B. G. Davis, F. Corzana and E. J. Cocinero \textit{ACS Cent. Sci.}, \textbf{6}, 293-303, 2020.}\footnote{E. J. Cocinero, A. Lesarri, P. Ecija, F. J. Basterretxea, J.-U. Grabow, J. A. Fernandez, F. Castaño \textit{Angew. Chem. Int. Ed.}, \textbf{51}, 3119, 2012.} of different fluorinated and deoxygenated carbohydrate analogues and comparing the results with those obtained in solution using a combination of NMR data and molecular dynamics simulations. The gg conformation is stabilized in the gas phase by intra molecular HBs that lock this conformation when oriented clockwise. However, and contrary to previously reported data, the conformation of the hydroxymethyl group in D-gluco and D-mannopyranose series follows a similar tendency in the gas phase and in solution, indicating the importance of stereo electronic and minimizing the importance of competing water molecules against stabilizing intra molecular HBs
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