1,721,138 research outputs found
Hourly measurement of particulate concentrations with streaker samplers and optical methods
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A verification of the integral transformation ot the projections technique for scatter correction in PET tomographs
No full textProton and deuteron radiative capture in light nuclei
No full textDifferential capture View the MathML source and View the MathML source cross sections have been measured at excitation energies between 17 and 41 MeV in 17F and 26 and 39 MeV in 17O at several angles in the 35°–135° interval. The (p, γo) data show, besides a direct capture term, the excitation of giant dipole resonances based on excited states having a probable 2p-1h structure. The main features of the deuteron capture cross section can be understood in terms of a semidirect mechanism with the two nucleons captured in the same single-particle configuration
Proton and deuteron radiative capture to A = 13 nuclei
No full textDifferential capture 12C(p, γ)13N and 11B(d, γ)13C cross sections have been measured in the excitation energy region between 20 and 45 MeV in 13N and 25 and 42 MeV in 13C. Angular distributions are given for the pγ channel at each energy, while the dγ excitation function has been measured at 60°. The pγ0 data show, besides a direct capture term, the excitation of giant dipole resonances based on excited states of the compound nucleus. The main feature of the deuteron capture cross section can be understood in terms of a mechanism in which the proton-neutron pair is captured in the same single particle configuration by the 11B core
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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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