1,721,104 research outputs found
Fotografía UDBC050300
No full textFotografía del ejemplar Fajardo, F. 4382, determinado como Asplenium sp
Fotografía UDBC050084
No full textFotografía del ejemplar Fajardo, F. 4307, determinado como Clusia sp
Fotografía UDBC040184
No full textFotografía del ejemplar Fajardo, F. 1964, determinado como Rhynchospora sp
Fotografía UDBC041661
No full textFotografía del ejemplar Fajardo, F. 362, determinado como Miconia elaeoide
Fotografía UDBC050344
No full textFotografía del ejemplar Fajardo, F. 5714, determinado como Clusia sp
Fotografía UDBC041731
No full textFotografía del ejemplar Fajardo, F. 1620, determinado como Myrsine latifolia en el año 202
Fotografía UDBC042984
No full textFotografía del ejemplar Fajardo, F. 220, determinado como Commiphora leptophloeos en el año 202
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Band Tails And Defect Density In P-type Doped Hydrogenated Amorphous Germanium
No full textThe correlations between the defect density, N D, Fermi energy, E F, and Urbach tail, E 0, are examined for rf-sputtered a-Ge:H films p-type doped by aluminum, gallium and indium. Photothermal deflection spectroscopy was used for the determination of N D and E 0, while E F was deduced from conductivity measurements. The present data show different dependence of N D on E F for samples doped by different dopants, but a similar behavior when N D is plotted as a function of E 0 or the solid-state dopant impurity concentration. The simple equilibrium model of doping alone is unable to explain the present results. The data suggest that the doping-induced defects observed are related to the large fraction of neutral dopant impurities expected to be present in the material.198-200PART 1399402Street, R.A., (1982) Phys. Rev. Lett., 49, p. 1187Winer, K., (1990) Phys. Rev., B41, p. 12150Pierz, K., Fuhs, W., Mell, H., (1991) Philos. Mag., B63, p. 123Ebersberger, B., Krühler, W., Fuhs, W., Mell, H., (1994) Appl. Phys. Lett., 65, p. 1683Comedi, D., Fajardo, F., Chambouleyron, I., (1995) Phys. Rev., B52, p. 4974Fajardo, F., Chambouleyron, I., (1995) Phys. Rev., B52, p. 4965Graeff, C.F.O., Stutzmann, M., Eberhardt, K., (1994) Philos. Mag., B69, p. 387Comedi, D., Fajardo, F., Chambouleyron, I., Tabacniks, M., (1994) J. Vac. Sci. Technol., A12, p. 3149Stutzmann, M., (1989) Philos Mag., B60, p. 531Aljishi, S., Shu, J., Ley, L., (1989) Mater. Res. Soc. Symp. Proc., 149, p. 12
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