1,720,992 research outputs found
ANALYTICAL CHARACTERIZATION OF ELECTRODE SURFACE BY X-RAY PHOTOELECTRON-SPECTROSCOPY - BETA-PBO2-BASED CATHODE IN VOLTAGE-COMPATIBLE LITHIUM CELLS
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Prevalence of intestinal parasites in dogs and cats from two provinces of Lombardy region and perception of related risks by the pet owners
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The stereochemical properties of the Schwartz's Reagent (h5-C5H5)2Zr(H)Cl in the reduction of cyclic ketones to alcohols
No full textA photoelectrochemical and spectroscopic investigation of oxide layers on AISI 301 in sulfate solutions at different pH
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Coating electroaccretion of galvanized iron and aluminum in seawater
No full textCoating electroaccretion on galvanized iron and aluminum 1100 under cathodic polarization in artificial and natural seawaterwas investigated
through electrochemical tests and optical imaging techniques. Biofilm affects the current density and the morphologies of gas evolution,
particularly the maximum size of the gas bubbles and the interaction between gas evolution and calcareous deposit. Coating mineral composition
is related to the type of metallic material and can be different according to growth in natural or artificial seawater. On galvanized iron in ASTM
and natural seawater at potential <−1.2V versus Ag/AgCl, coating is composed of aragonite and brucite as calcareous deposits on pure iron,
aragonite forming before the growth of brucite. Even when coupled to a magnesium anode, the zinc layer can corrode and large aggregates of
brucite and aragonite form on the bare steel. Coatings are composed of zinc hydroxychloride Zn5(OH)8Cl2·H2O and aragonite without brucite
if electroaccretion is performed in natural seawater at potential >−1.2V versus Ag/AgCl. Coatings grown on aluminum 1100 are different
from those on galvanized iron. In ASTM seawater, the coating on aluminum 1100 is composed of aluminum oxide and Mg4Al2(OH)14·2H2O;
in natural seawater, only of aluminum oxide. On specimens coupled with magnesium anode, the coating does not contain brucite and is
composed of aragonite with Mg6Al2(OH)18·4H2O islands
Photoelectrochemical imaging of non-planar surfaces : the influence of geometrical and optical factors on image formation
No full textIn situ scanning photoelectrochemical (PEC) microscopy is a technique for mapping the photocurrent stimulated by a focused light at an electrode-electrolyte interface. This technique gives position-sensitive information on the nature of passivating films (composition, type and degree of crystallization, thickness, etc) that cover metal electrodes. In the analysis of PEC images, further aspects related to the surface shape and/or surface irregularities (roughness, slope errors, surface waviness, etc) have to be taken into account. In this paper we present the effects of non-planar surfaces by measuring the photoresponse of passivating oxide films on cylindrical iron rods with different diameters. The variation of the angle of incidence of the light, as the laser beam scans the surface of the rod, implies either a change in the spot size and different optical response of the oxide-metal system, such as the transmittivity of the oxide, the reflectivity of the metal and the light path inside the film. For evaluating the behaviour of the photocurrent, we have simulated these geometrical and optical effects by using a simple model in geometrical optics approximation. Images have been also acquired at various distances from the beam focus for highlighting the degradation of the spatial resolution induced by the focusing misalignment of the curved samples
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
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