Role of Visible Spectroscopy in Bio-Optical Characterization of Coastal Waters

2020 ◽  
pp. 1-5
Author(s):  
Anurag Gupta ◽  
Syed Moosa Ali ◽  
Aswathy Vijaya Krishna ◽  
Arvind Sahay ◽  
Mini Raman
Keyword(s):  
Coastal Waters ◽  
Optical Characterization ◽  
Visible Spectroscopy

Electrical and optical characterization of Er‐implanted Si: The role of impurities and defects

1993 ◽  
Vol 74 (8) ◽  
pp. 4936-4942 ◽  
Author(s):  
F. Priolo ◽  
S. Coffa ◽  
G. Franzò ◽  
C. Spinella ◽  
A. Carnera ◽  
...  
Keyword(s):  
Optical Characterization ◽  
Impurities And Defects

scholarly journals Fabrication and Optical Characterization of Doped Germanosilicate Fibres

1993 ◽  
Vol 329 ◽  
Author(s):  
Elizabeth R. Taylor ◽  
C. C. Ye ◽  
B. J. Ault ◽  
D. N. Payne
Keyword(s):  
Chemical Vapour Deposition ◽  
Fluorescence Spectra ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Optical Characterization ◽  
Optical Fibres ◽  
The Core ◽  
Solution Doping

AbstractThis work assesses the incorporation of dopant ions such as Al3+, Ga3+, Zr4+, Nb5+, Ta5+ and Er3+ into the core of germanosilicate optical fibres via modified-chemical-vapour-deposition plus solution doping fabrication techniques. We find that highly-charged smaller ions, like Al3+ and Ta5+, behave similarly. These ions are more efficiently incorporated, assist in the incorporation of Er3+, and have the same influence on the fluorescence spectra of Er3+. The structural role of these ions appear to be their ability to provide nonbridging oxygens around Er3+. The waveguide and lasing characteristics of Er3+ codoped with Ta5+ are presented.

MOVPE Growth and Optical Characterization of GaPN Metastable Alloy Semiconductor

1996 ◽  
Vol 449 ◽  
Author(s):  
K. Onabe
Keyword(s):  
Optical Characterization ◽  
Band Edge ◽  
Edge States ◽  
Time Resolved ◽  
Line Energy ◽  
Gap Energy ◽  
N Source ◽  
N Concentration

ABSTRACTThe Gap1–x Nx, alloy semiconductor has been grown with the N concentration as high as 6.3% by inetalorganic vapor phase epitaxy (MOVPE) using 1,1-dimethylhydrazine (DMHy) as the N source. The growth characteristics show the key role of the non-equilibrium circumstances during the growth, where the N desorption from the surface limits the N incorporaton. The band-edge states have been studied using time-resolved PL and PL excitation spectroscopies. The PL takes place via the tail states below the absorption edge. The band edge, which shifts to lower energies with increasing N concentration, originates from the A-line energy (i.e. isolated N states) rather than the indirect-gap energy of GaP in the limit x = 0.

Digital x-ray mapping of nanometer-size supported bimetallic catalysts

1988 ◽  
Vol 46 ◽  
pp. 530-531
Author(s):  
L. T. Germinario
Keyword(s):  
Background Radiation ◽  
Metal Cluster ◽  
Single Element ◽  
Beam Diameter ◽  
X Rays ◽  
X Ray ◽  
Major Interest ◽  
Induced Changes

Understanding the role of metal cluster composition in determining catalytic selectivity and activity is of major interest in heterogeneous catalysis. The electron microscope is well established as a powerful tool for ultrastructural and compositional characterization of support and catalyst. Because the spatial resolution of x-ray microanalysis is defined by the smallest beam diameter into which the required number of electrons can be focused, the dedicated STEM with FEG is the instrument of choice. The main sources of errors in energy dispersive x-ray analysis (EDS) are: (1) beam-induced changes in specimen composition, (2) specimen drift, (3) instrumental factors which produce background radiation, and (4) basic statistical limitations which result in the detection of a finite number of x-ray photons. Digital beam techniques have been described for supported single-element metal clusters with spatial resolutions of about 10 nm. However, the detection of spurious characteristic x-rays away from catalyst particles produced images requiring several image processing steps.

Consideraciones en torno a la reducción solipsista

1970 ◽  
Vol 11 ◽  
Author(s):  
Natalia Carolina Petrillo

ResumenEn el presente trabajo se intentará mostrar que la fenomenología no conduce a una postura solipsista. Para ello, se caracterizará en qué consiste el solipsismo. Luego, se intentará refutar a lo que se ha de llamar “solipsismo metafísico” y “solipsismo gnoseológico”, con el objetivo principal de poner de manifiesto el fundamento de motivación para la salida de la ficción solipsista.Palabras claves:Phenomenology – solipsim – empatía - HusserlAbstractWith the aim of showing that phenomenology does not lead in solipsism, I will first attempt a characterization of it. Then, I will attempt a refutation of the so-called “metaphysical” and “epistemological” solipsisms. Finally, the nature and role of Husserl´s solipsistic fiction is examined, and the grounds that motivate the overcoming of this standpoint are disclosed.key wordsFenomenología – solipsismo - empathy – Husserl

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