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ResearchHub is incentivizing healthy research behavior. At this time, first authors of open access papers are eligible for rewards. Visit the publications tab to view your eligible publications.
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Piotr Wysocki
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Comparative study of the catalytic growth of patterned carbon nanotube films
Christian Klinke
et al.
Aug 3, 2005
Three different catalysts (Fe, Ni, Co nitrates dissolved in ethanol) werepatterned on a SiO2/Si substrate and multi-wall carbon nanotubes were grown bycatalytic decomposition of acetylene. We compare the growth of the carbonnanostructures in the temperature range between 580C and 1000C. With ourexperimental set-up the catalyst solutions of cobalt and nickel were found tobe less efficient than the one of iron. An optimal production of multi-wallnanotubes was observed at temperatures between 650C and 720C with the ironsolution as catalyst. We found a tendency towards thicker structures withhigher temperatures. Finally, we suggest a mechanism for the growth of thesecarbon structures.
Materials Science
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Materials Science
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Nuclear binding energies: Global collective structure and local shell-model correlations
Covadonga Martínez Díaz-Caneja
et al.
Mar 27, 2001
Nuclear binding energies and two-neutron separation energies are analyzedstarting from the liquid-drop model and the nuclear shell model in order todescribe the global trends of the above observables. We subsequentlyconcentrate on the Interacting Boson Model (IBM) and discuss a new method inorder to provide a consistent description of both, ground-state andexcited-state properties. We address the artefacts that appear when crossingmid-shell using the IBM formulation and perform detailed numerical calculationsfor nuclei situated in the 50-82 shell. We also concentrate on local deviationsfrom the above global trends in binding energy and two-neutron separationenergies that appear in the neutron-deficient Pb region. We address possibleeffects on the binding energy, caused by mixing of low-lying $0^{+}$ intruderstates into the ground state, using configuration mixing in the IBM framework.We also study ground-state properties using a deformed mean-field approach.Detailed comparisons with recent experimental data in the Pb region are amplydiscussed.
Nuclear Physics
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Nuclear Physics
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Nuclear matter hole spectral function in the Bethe-Brueckner-Goldstone approach
Raymond W. Lam
et al.
Dec 19, 2001
The hole spectral function is calculated in nuclear matter to assess therelevance of nucleon-nucleon short range correlations. The calculation iscarried out within the Brueckner scheme of many-body theory by using severalnucleon-nucleon realistic interactions. Results are compared with otherapproaches based on variational methods and transport theory. Discrepanciesappear in the high energy region, which is sensitive to short rangecorrelations, and are due to the different many-body treatment more than to thespecific N-N interaction used. Another conclusion is that the momentumdependence of the G-matrix should be taken into account in any self consistentapproach.
Nuclear Physics
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Nuclear Physics
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