124,915 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Characterization and Investigation of NLO Properties of some Selected Electrodeposited Polythiophenes
No full textIn this work we study the electronic properties of ClO− doped polythiophenes and discuss the nonlinear optical properties of these organic
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compounds galvanostatically electrodeposited on ITO glasses. The investigation on the electronic properties (band gap, flat band potential)
was performed by means of a non-destructive optical technique, photocurrent spectroscopy (PCS). The investigation on the nonlinear optical
response was carried out by means of second and third harmonic generation (SHG and THG) measurements. In particular, the effect of the
oxidation state of the polymeric films was studied by comparing the NLO response of oxidized and reduced polythiophenes. Reduced poly-
meric films show higher values of the second (χ
h2i) and third (χ
h3i) order nonlinear optical susceptibilitie
Electrochemical growth and physico-chemical characterization in organic medium of Nb2O5 thin films
No full textInvestigations about the energetics and the electrical properties of niobium thin film, electrochemically grown,
were performed in an organic solution of acetonitrile and lithium perchlorate. The study of the energetics of the
Nb O /organic solution interface was performed by means of a non-destructive optical technique, photocurrent
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spectroscopy. By means of this technique, it was possible estimating the value of the flat band potential and
locating conduction and valence band. A more cathodic value of flat band potential in respect with acidic
solution was found in organic medium. From impedance spectra, the electrical circuit that gives best fitting
values is constituted by two resistances in parallel with two constant phase elements and in series with the
resistance of the electrolyte. On considering the exponential coefficient, the constant phase elements model
distorted capacitances
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
METHODOLOGY of conducting field and laboratory researches with Switchgrass (Panicum virgatum L.)
No full textKulyk М. І., Rakhmetov D. B., Kurylo V. L. Methodology of conducting field and laboratory researches with Switchgrass (Panicum virgatum L.). Poltava, 2017. 24 p
METHODOLOGY of conducting field and laboratory researches with Switchgrass (Panicum virgatum L.)
No full textKulyk М. І., Rakhmetov D. B., Kurylo V. L. Methodology of conducting field and laboratory researches with Switchgrass (Panicum virgatum L.). Poltava, 2017. 24 p
Methodology of conducting field and laboratory researches with switchgrass (Panicum virgatum L.)
No full textKulyk М. І., Rakhmetov D. B,. Kurylo V. L. Methodology of conducting field and laboratory researches with switchgrass (Panicum virgatum L.). Poltava, 2017. 24 p
Fluorescence Quenching in Hybrid Solar Cells Based on Electrodeposited ZnO
No full textA study about fluorescence phenomena in hybrid donor-acceptor interfaces based on electrodeposited zinc oxide (e-ZnO)
having different architectures is performed. In particular ITO/ZnO/P3HT and ITO/ZnO/P3HT:PCBM are investigated and
their photoluminescence responses are compared with those of ITO/P3HT and ITO/P3HT:PCBM. As expected,
ITO/ZnO/P3HT:PCBM and ITO/P3HT:PCBM present higher exciton quenching than ITO/ZnO/P3HT and ITO/P3HT
respectively. Furthermore, the hybrid configuration ITO/ZnO/P3HT:PCBM displays a higher quenching percentage in a
wider wavelength range than ITO/P3HT:PCBM, indicating a better photo-induced charge separation in e-ZnO based hybrid
devices
Biological features and potential of crop yields of energy cultures in the conditions of Ukraine
No full textKurylo V. L., Raxmetov D. B., Kulyk M. I. Biological features and potential of crop yields of energy cultures in the conditions of Ukraine. Bulletin of Poltava State Agrarian Academy. 2018. Vol. 1 : 11-17. DOI 10.31210/visnyk2018.01.0
Influence of Ag, Cu dopants on the second and third optical harmonic generation of ZnO films
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