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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
Crosslinkable elastomeric compositions for use in tires
No full textTire comprising at least one structural element including a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomeric composition comprising : (a) 100 phr of at least one elastomeric polymer; (b) from 0.1 phr to 120 phr, preferably from 20 phr to 90 phr of at least one silica reinforcing filler; (c) from 0.1 phr to 10 phr, preferably from 0.5 phr to 8 phr, of at least one coupling agent containing at least one mercapto group, (d) from 0.5 phr to 20 phr, preferably from 2 phr to 10 phr, of at least one layered material having an individual layer thickness of from 0.01 nm to 30 nm, preferably of from 0.2 nm to 15 nm, more preferably of from 0.5 nm to 2 nm. Preferably, said at least one structural element is a tread band
Sulla possibilità di introdurre nel processo penale ordinario l'istituto della declaratoria di particolare tenuità del fatto. Riflessioni a margine di una recente proposta.
No full textFunctionalization of diene rubbers to control the viscoelasticity of silica based compounds
No full text
Sulla possibilità di introdurre nel processo penale ordinario l'istituto della declaratoria di particolare tenuità del fatto. Riflessioni a margine di una recente proposta
No full textBranching formation in the ethylene polymerization with meso metallocenes based catalysts
No full textAn investigation of the ethylene polymerization with meso ansa metallocenes of group 4 allows clarifying some aspects of the branching formation observed in the polyethylene produced with these catalysts. The meso structure of the zirconocene precursor is more effective in promoting the chain growing isomerization when indenyl ligands bear no substituents. But the same coordinating neighborhood when surrounding the Ti(IV) or Hf(IV) ion gives rise to complexes not effective in the ethyl-branched polyethylene synthesis. On the other hand, several activators in combination with meso-ethylenebis(1- indenyl)Zr(CH3)2 produce catalysts able to polymerize ethylene to ethyl-branched polyethylene. No difference has been detected in the amount of branches with respect to that observed with MAO-activated meso-ethylenebis(1-indenyl)ZrCl2
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