774 resultados para 1556
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CON: Loca quae ex diligenti cum Hispanico autographo collatione adnotata sunt in hac postrema editione. Romae : [s.n.], 25 Iunij 1596. 16 p. Sign.: A8
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Imp. tomado del colofón
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Capitulares grab. xil.
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Sign.: [cruz]8, a-t8
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Pie de imp. tomado del colofón.
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The Top-Hat hot electron light emission and lasing in semiconductor heterostructure (HELLISH)-vertical cavity semiconductor optical amplifier (VCSOA) is a modified version of a HELLISH-VCSOA device. It has a shorter p-channel and longer n-channel. The device studied in this work consists of a simple GaAs p-i-n junction, containing 11 Ga0.35In0.65 N0.02As0.08/GaAs multiple quantum wells in its intrinsic region; the active region is enclosed between six pairs of GaAs/AlAs top distributed Bragg reflector (DBR) mirrors and 20.5 pairs of AlAs/GaAs bottom DBR mirrors. The operation of the device is based on longitudinal current transport parallel to the layers of the GaAs p-n junction. The device is characterised through I-V-L and by spectral photoluminescence, electroluminescence and electro-photoluminescence measurements. An amplification of about 25 dB is observed at applied voltages of around V = 88 V.
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The use of GaAsSbN capping layers on InAs/GaAs quantum dots (QDs) has recently been proposed for micro- and optoelectronic applications for their ability to independently tailor electron and hole confinement potentials. However, there is a lack of knowledge about the structural and compositional changes associated with the process of simultaneous Sb and N incorporation. In the present work, we have characterized using transmission electron microscopy techniques the effects of adding N in the GaAsSb/InAs/GaAs QD system. Firstly, strain maps of the regions away from the InAs QDs had revealed a huge reduction of the strain fields with the N incorporation but a higher inhomogeneity, which points to a composition modulation enhancement with the presence of Sb-rich and Sb-poor regions in the range of a few nanometers. On the other hand, the average strain in the QDs and surroundings is also similar in both cases. It could be explained by the accumulation of Sb above the QDs, compensating the tensile strain induced by the N incorporation together with an In-Ga intermixing inhibition. Indeed, compositional maps of column resolution from aberration-corrected Z-contrast images confirmed that the addition of N enhances the preferential deposition of Sb above the InAs QD, giving rise to an undulation of the growth front. As an outcome, the strong redshift in the photoluminescence spectrum of the GaAsSbN sample cannot be attributed only to the N-related reduction of the conduction band offset but also to an enhancement of the effect of Sb on the QD band structure.
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[3a ed.]
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Sign.: *8, 2*4, A-Z8, 2A-2Z8, 3A-3D8
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Indice a dos col.
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Hojas imp. por ambas caras
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Ed. berria, garbitua, chuchendua eta bere baithaco ordenan emana
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Autor: Francisco R. Laphitz Arriada; tomado de: Eusko bibliographia. v. IV, p. 591
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Estudio premiado por la Asociación provincial de maestros de escuelas públicas de Barcelona, en el Certamen literario conmemorativo del 3er. centenario de la publicación de "El Quijote"