Results 61 to 70 of about 84,691 (149)

On the asymptotic giant branch star origin of peculiar spinel grain OC2 [PDF]

, 2006
Microscopic presolar grains extracted from primitive meteorites have extremely anomalous isotopic compositions revealing the stellar origin of these grains.
A. I. Karakas, Anders, Angulo, Bernatowicz, Blackmon, Boothroyd, C. Iliadis, C. M. O'D. Alexander, Cannon, Chafa, Choi, Choi, Clayton, Denissenkov, Fox, Frost, Frost, Gallino, Heger, Herwig, Herwig, Herwig, Herwig, Herwig, J. C. Lattanzio, José, Karakas, Karakas, Karakas, L. R. Nittler, Landré, Limongi, Lodders, Lugaro, Lugaro, M. Lugaro, Maeder, Mazzitelli, Messenger, Mostefaoui, Nguyen, Nittler, Nittler, Nittler, Nollett, Nuth, P. Hoppe, Plez, Prantzos, Rauscher, Reddy, Romano, Runkle, Smith, Talon, Timmes, van Loon, van Loon, Vassiliadis, Ventura, Ventura, Weiss, Williams, Wood, Yoon, Zinner, Zinner, Zinner   +67 more
core   +3 more sources

Algebra de Clifford

Momento, 1990
El algebra de Clifford (o algebra geometrical como lenguaje unificado para matemáticos y físicos ha adquirido auge en los últimos años y David Hestenes ha sido uno de sus grandes impulsores con trabajos de datan desde los años 60.
María Carolina Spinel G.
doaj  

Rutas de señalización celular involucradas en la plasticidad post-sináptica inducida por la activación de los canales de glutamato tipo NMDA en el hipocampo

Acta Biológica Colombiana, 2005
La apertura de los canales de glutamato tipo NMDA, gracias a la acción concomitante de las neuronas pre-sináptica y post-sináptica a nivel de las espinas dendríticas, induce a modificaciones de la fuerza y eficacia sinápticas en éstas, fenómeno mejor ...
Sebastián Patrón Saade, Clara Spinel
doaj  

X-ray Diffraction Analysis of Cu2+ Doped Zn1-xCuxFe2O4 Spinel Nanoparticles using Williamson-Hall Plot Method

, 2019
The nanoparticles (NPs) of Zn1-xCuxFe2O4 (ZCFO) spinels with x = 0, 0.2, 0.4, 0.6 and 0.8 were synthesized by a sol-gel combustion method using acetate precursor. The NPs of ZCFO were prepared by following calcination process at 600C for 8hrs.
Kumar, Abhishek, Kumar, Dinesh, Prakash, Rajiv, Singh, Akhilesh Kumar   +3 more
core   +1 more source

Evidence of defect-induced ferromagnetism in ZnFe$_{2}$O$_{4}$ thin films

, 2011
X-ray absorption near-edge and grazing incidence X-ray fluorescence spectroscopy are employed to investigate the electronic structure of ZnFe$_{2}$O$_{4}$ thin films.
Esquinazi, P., Golmar, F., Heluani, S. P., Torres, C. E. Rodríguez, Ziese, M.   +4 more
core   +1 more source

Dilute ferrimagnetic semiconductors in Fe-substituted spinel ZnGa$_2$O$_4$

, 2004
Solid solutions of nominal composition [ZnGa$_2$O$_4$]$_{1-x}$[Fe$_3$O$_4$]$_x$, of the semiconducting spinel ZnGa$_2$O$_4$ with the ferrimagnetic spinel Fe$_3$O$_4$ have been prepared with $x$ = 0.05, 0.10, and 0.15.
A S Risbud, Awschalom D D, Bérar J F Garnier P, C Felser, Fleet M E, J Ensling, Josties M, Kim J H, Kolesnik S, Loeffler L, Matthias B T, R Seshadri, Rashba E I, Sampath S K, Spiering H, Sundman B   +15 more
core   +1 more source

Desenvolvimento e caracterização de recobrimentos de Ni-Co e de seus óxidos mistos para a produção de oxigênio por eletrólise alcalina da água Development and characterisation of coatings of Ni-Co and their mixed oxides for oxygen production by alkaline water electrolysis

Química Nova, 1997
This paper describes the development and characterisation of Ni-Co coatings to be used as anodes in water electrolysis. Chemical oxidation of the surface was performed through thermal treatment at 400ºC for 10 h. The resulting surfaces were analysed by X-
Sergio A. S. Machado, Simone C. Gallani
doaj   +1 more source

Optical constants of refractory oxides at high temperatures

, 2013
Many cosmic dust species, among them refractory oxides, form at temperatures higher than 300 K. Nevertheless, most astrophysical studies are based on the room-temperature optical constants of solids, such as corundum and spinel. A more realistic approach
Mutschke, Harald, Posch, Thomas, Zeidler, Simon   +2 more
core   +1 more source

Síntese de ZnAl2O4: Yb:Er por reação de combustão Synthesis of ZnAl2O4: Yb:Er by combustion reaction

Cerâmica, 2006
Aluminato de zinco dopado com os íons terras raras itérbio e érbio nas proporções 2:1, 3:1, 4:1, e 5:1 mol de Yb:Er foi sintetizado por reação de combustão.
J. F. Silva, A. C. F. M. Costa, B. S. Barros, L. Gama, R. H. G. A. Kiminami, S. Alves-Jr   +5 more
doaj   +1 more source

Nicral ternary alloy having improved cyclic oxidation resistance [PDF]

, 1982
NiCrAl alloys are improved by the addition of zirconium. These alloys are in the Beta or gamma/gamma' + Beta region of the ternary system. Zirconium is added in a very low amount between 0.06 and 0.20 weight percent.
Barrett, C. A., Khan, A. S., Lowell, C. E.   +2 more
core   +1 more source