143 research outputs found
Studies of concentration and temperature dependencies of precipitation kinetics in iron-copper alloys using kinetic monte carlo and stochastic statistical simulations
The earlier-developed ab initio model and the kinetic Monte Carlo method
(KMCM) are used to simulate precipitation in a number of iron-copper alloys
with different copper concentrations x and temperatures T. The same simulations
are also made using the improved version of the earlier-suggested stochastic
statistical method (SSM). The results obtained enable us to make a number of
general conclusions about the dependencies of the decomposition kinetics in
Fe-Cu alloys on x and T. We also show that the SSM describes the precipitation
kinetics in a fair agreement with the KMCM, and employing the SSM in
conjunction with the KMCM enables us to extend the KMC simulations to the
longer evolution times. The results of simulations seem to agree with available
experimental data for Fe-Cu alloys within statistical errors of simulations and
the scatter of experimental results. Comparison of results of simulations to
experiments for some multicomponent Fe-Cu-based alloys enables us to make
certain conclusions about the influence of alloying elements in these alloys on
the precipitation kinetics at different stages of evolution.Comment: 18 pages, 17 postscript figures, LaTe
Testing neutrino magnetic moment in ionization of atoms by neutrino impact
The atomic ionization processes induced by scattering of neutrinos play key
roles in the experimental searches for a neutrino magnetic moment. Current
experiments with reactor (anti)neutrinos employ germanium detectors having
energy threshold comparable to typical binding energies of atomic electrons,
which fact must be taken into account in the interpretation of the data. Our
theoretical analysis shows that the so-called stepping approximation to the
neutrino-impact ionization is well applicable for the lowest bound Coulomb
states, and it becomes exact in the semiclassical limit. Numerical evidence is
presented using the Thomas-Fermi model for the germanium atom.Comment: 5 pages, 1 figur
Transverse momentum spectra of charged particles in proton-proton collisions at GeV with ALICE at the LHC
The inclusive charged particle transverse momentum distribution is measured
in proton-proton collisions at GeV at the LHC using the ALICE
detector. The measurement is performed in the central pseudorapidity region
over the transverse momentum range GeV/.
The correlation between transverse momentum and particle multiplicity is also
studied. Results are presented for inelastic (INEL) and non-single-diffractive
(NSD) events. The average transverse momentum for is (stat.) (syst.) GeV/ and
\left_{\rm NSD}=0.489\pm0.001 (stat.) (syst.)
GeV/, respectively. The data exhibit a slightly larger than measurements in wider pseudorapidity intervals. The results are
compared to simulations with the Monte Carlo event generators PYTHIA and
PHOJET.Comment: 20 pages, 8 figures, 2 tables, published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/390
Estimation of the number of polar molecules in a solvate shell of a fluorescent probe 4-dimethylaminochalcone
Study of effects of cholesterol on the polar groups of the lipid bilayer using a fluorescent probe, 4-dimethylaminochalcone
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