1,636 research outputs found
Surface-Induced Phase Transition During Coalescence of Au Nanoparticles: A Molecular Dynamics Simulation Study
In this study, the melting and coalescence of Au nanoparticles were
investigated using molecular dynamics simulation. The melting points of
nanoparticles were calculated by studying the potential energy and Lindemann
indices as a function of temperature. The simulations show that coalescence of
two Au nanoparticles of the same size occurs at far lower temperatures than
their corresponding melting temperature. For smaller nanoparticles, the
difference between melting and coalescence temperature increases. Detailed
analyses of the Lindemann indices and potential energy distribution across the
nanoparticles show that the surface melting in nanoparticles begins at several
hundred degrees below the melting point. This suggests that the coalescence is
governed by the liquid-phase surface diffusion. Furthermore, the surface
reduction during the coalescence accelerates its kinetics. It is found that for
small enough particles and/or at elevated temperatures, the heat released due
to the surface reduction result in a melting transition of the two attached
nanoparticles.Comment: 15 pages, 4 figures, 1 table, full length articl
Implication of Quadratic Divergences Cancellation in the Two Higgs Doublet Model
With the aim of exploring the Higgs sector of the Two Higgs Doublet Model
(2HDM), we have chosen the exact and soft symmetry breaking versions of
the 2HDM with non-zero vacuum expectation values for both Higgs doublets (Mixed
Model). We consider two SM-like scenarios: with 125 GeV and 125 GeV . We
have applied the condition for cancellation of quadratic divergences in the
type II 2HDM in order to derive masses of the heavy scalars. Solutions of two
relevant conditions were found in the considered SM-like scenarios. After
applying the current LHC data for the observed 125 GeV Higgs boson, the
precision electroweak data test and lower limits on the mass of , the
allowed region of parameters shrink strongly
Synchrophasor monitoring of single line outages via area angle and susceptance
The area angle is a scalar measure of power system area stress that responds
to line outages within the area and is a combination of synchrophasor
measurements of voltage angles around the border of the area. Both idealized
and practical examples are given to show that the variation of the area angle
for single line outages can be approximately related to changes in the overall
susceptance of the area and the line outage severity.Comment: adjusted version accepted at North American Power Symposium (NAPS),
Pullman WA USA, September 201
A phenomenological study on the production of Higgs bosons in the cSMCS model at the LHC
In the present work, we intend to predict the production rates of the Higgs
bosons in the simplest extension of the Standard Model (SM) by a neutral
complex singlet (cSMCS). This model has an additional source of CP violation
and provides strong enough first-order electroweak phase transition to generate
the baryon asymmetry of universe (BAU). The scalar spectrum of the cSMCS
includes three neutral Higgs particles with the lightest one considered to be
the 125 GeV Higgs boson found at LHC. The SM-like Higgs boson comes mostly from
the SM-like SU(2) doublet, with a small correction from the singlet. To predict
the production rates of the Higgs bosons, we use a conventional effective LO
QCD framework and the unintegrated parton distribution functions (UPDF) of
Kimber-Martin-Ryskin (KMR). We first compute the SM Higgs production
cross-section and compare the results to the existing theoretical calculations
from different frameworks as well as the experimental data from the CMS and
ATLAS collaborations. It is shown that our framework is capable of producing
sound predictions for these high-energy QCD events in the SM. Afterwards we
present our predictions for the Higgs boson production in the cSMCS.Comment: Fitted by the published version, 1 figure and 2 benchmarks have been
omitted, additional comparisons have been added and several misprints have
been correcte
The prevalence of Restless Legs Syndrome/Willis-ekbom disease (RLS/WED) in the third trimester of pregnancy:a systematic review
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