1,720,965 research outputs found
Plasma deposition of thin films from a F-containing cyclo-siloxane
No full textThin films have been deposited from radio-frequency glow discharges fed with vapors of a silicon- and fluorine-containing organic compound, namely 2,4,6-tris[(3,3,3-trifluoropropyl)(methyl)] cyclotrisiloxane, in mixture with argon
Tribological behaviour of sintered iron bearings self-lubricated with PFPE under severe operating conditions
No full textThe tribological properties of sintered iron bearings self-lubricated with perfluoropolyethers (PFPEs) were investigated under severe operating conditions. Tests were carried out at a temperature of 150°C for a range of constant PV values and at room temperature for PV values exceeding the limits laid down by Metal Powder Industry Federation (MPIF) specifications. The performance of the PFPE-lubricated bearings was found to be superior to that bearings lubricated with mineral oil. At 150°C and PV=0.4 MN/ms the life of the PFPE-lubricated bearings exceeded 150 hours without damage -five to six times longer than the life given for such conditions by MPIF specifications
Films layers, tapes, plates, and similar structures of metal or of plastic materials, coated with thin polyfluorocarbon films
No full textPerfluoroalkanesulfonylimides and their lithium salts: synthesis and characterisation of intermediates and target compounds
No full textECF processes have been extensively experienced and developed since early 1970s at the Fluorine Chemistry Laboratory of Padua University: several classes of perfluorinated inert and functional compounds have been obtained, in particular perfluoro heterocyclics and perfluorinated acid fluorides.
Recently the demand for electrolyte salts, applied in lithium batteries, drove our interest to investigate on the perfluoroalkanesulfonylimides.
A series of the perfluoroalkanesulfonylfluoride precursors has been obtained by ECF and their metathesis to the related imides and lithium salts has been investigated.
A number of representative products has been obtained and characterized in their structure and ionic conductivity
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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