6,055 research outputs found
Pion Production in Heavy-ion Collisions in the 1 A GeV region
Within the framework of the improved isospin dependent quantum molecular
dynamics (ImIQMD) model, the pion emission in heavy-ion collisions in the
region 1 A GeV is investigated systematically, in which the pion is considered
to be mainly produced by the decay of resonances (1232) and
N*(1440). The in-medium dependence and Coulomb effects of the pion production
are included in the calculation. Total pion multiplicity and
yields are calculated for the reaction Au+Au in central
collisions for selected Skyrme parameters SkP, SLy6, Ska, SIII and compared
them with the measured data by the FOPI collaboration.Comment: 9 pages, 5 figure
Fusion dynamics of symmetric systems near barrier energies
The enhancement of the sub-barrier fusion cross sections was explained as the
lowering of the dynamical fusion barriers within the framework of the improved
isospin-dependent quantum molecular dynamics (ImIQMD) model. The numbers of
nucleon transfer in the neck region are appreciably dependent on the incident
energies, but strongly on the reaction systems. A comparison of the neck
dynamics is performed for the symmetric reactions Ni+Ni and
Ni+Ni at energies in the vicinity of the Coulomb barrier. An
increase of the ratios of neutron to proton in the neck region at initial
collision stage is observed and obvious for neutron-rich systems, which can
reduce the interaction potential of two colliding nuclei. The distribution of
the dynamical fusion barriers and the fusion excitation functions are
calculated and compared them with the available experimental data.Comment: 9 pages, 5 figure
Production of heavy isotopes in transfer reactions by collisions of U+U
The dynamics of transfer reactions in collisions of two very heavy nuclei
U+U is studied within the dinuclear system (DNS) model.
Collisions of two actinide nuclei form a super heavy composite system during a
very short time, in which a large number of charge and mass transfers may take
place. Such reactions have been investigated experimentally as an alternative
way for the production of heavy and superheavy nuclei. The role of collision
orientation in the production cross sections of heavy nuclides is analyzed
systematically. Calculations show that the cross sections decrease drastically
with increasing the charged numbers of heavy fragments. The transfer mechanism
is favorable to synthesize heavy neutron-rich isotopes, such as nuclei around
the subclosure at N=162 from No (Z=102) to Db (Z=105).Comment: 4 pages, 4 figure
When Edge Meets FaaS: Opportunities and Challenges
The proliferation of edge devices and the rapid growth of IoT data have
called forth the edge computing paradigm. Function-as-a-service (FaaS) is a
promising computing paradigm to realize edge computing. This paper explores the
feasibility and advantages of FaaS-based edge computing. It also studies the
research challenges that should be addressed in the design of such systems,
which are 1) the quick decomposing and recomposing of applications, 2) the
trade-off between performance and isolation of sandbox mechanisms, and 3)
distributed scheduling. The challenges are illustrated by evaluating existing
FaaS-based edge platforms, AWS IoT Greengrass, and OpenFaaS
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