3,897 research outputs found
Entanglement spectrum: Identification of the transition from vortex-liquid to vortex-lattice state in a weakly interacting rotating Bose-Einstein condensate
We use entanglement to investigate the transition from vortex liquid phase to
vortex lattice phase in weakly interacting rotating Bose-Einstein condensate
(BEC). Ground state entanglement spectrum is analyzed to distinguish these two
different phases. For the torus geometry, the low-lying part of ground state
entanglement spectrum, as well as the behavior of its lowest level change
clearly when the transition occurs. For the sphere geometry, the disappearance
of entanglement gap in the conformal limit (CL) can indicate this transition.
We also show that the decrease of entanglement between particles can be
regarded as a signal of the transition.Comment: published versio
Electromagnetic radiation of baryons containing two heavy quarks
The two heavy quarks in a baryon which contains two heavy quarks and a light
one, can constitute a scalar or axial vector diquark. We study electromagnetic
radiations of such baryons, (i) \Xi_{(bc)_1} -> \Xi_{(bc)_0}+\gamma, (ii)
\Xi_{(bc)_1}^* -> \Xi_{(bc)_0}+\gamma, (iii) \Xi_{(bc)_0}^{**}(1/2, l=1) ->
\Xi_{(bc)_0}+\gamma, (iv) \Xi_{(bc)_0}^{**}(3/2, l=1) -> \Xi_{(bc)_0}+\gamma
and (v) \Xi_{(bc)_0}^{**}(3/2, l=2) -> \Xi_{(bc)_0}+\gamma, where
\Xi_{(bc)_{0(1)}}, \Xi^*_{(bc)_1} are S-wave bound states of a heavy scalar or
axial vector diquark and a light quark, and \Xi_{(bc)_0}^{**}(l is bigger than
1) are P- or D-wave bound states of a heavy scalar diquark and a light quark.
Analysis indicates that these processes can be attributed into two categories
and the physical mechanisms which are responsible for them are completely
distinct. Measurements can provide a good judgment for the diquark structure
and better understanding of the physical picture.Comment: 15 pages, Late
Analysis on Safety of Removing the Closure Segment in a Prestressed Concrete Cable-stayed Bridge
AbstractAiming at failure of closure segment in a prestressed concrete cable-stayed bridge, a strengthening technology, namely replacing the closure segment, was firstly put forward. But removing the old closure segment was a process of release of internal force and had great risk. So the structural safety possibly induced by removing must be analyzed and confirmed. Based on FEM and summary of engineering experience, the construction stages for removing the old closure segment were simulated, and then some analysis relevant to safety, including thermal effect, dynamic characteristics and global stability of the whole bridge structure, were systematically presented. According to these analysis results, corresponding prevention and control measures were provided to ensure construction safety. Studies showed that, variation range of its structural state between before and after removing is not obvious, and its dynamic characteristics changed little after removing. In addition, structural instability could not be induced by removing, but for the sake of improving construction safety reliability, necessary safety prevention and control measures were indispensable. Analysis on safety of removing the old closure segment constituted the important part of the strengthening technology of replacing the closure segment, and became the theoretical basis of removing partial structural members for existing bridges
Dual residence time for droplet to coalesce with liquid surface
When droplets approach a liquid surface, they have a tendency to merge in
order to minimize surface energy. However, under certain conditions, they can
exhibit a phenomenon called coalescence delay, where they remain separate for
tens of milliseconds. This duration is known as the residence time or the
non-coalescence time. Surprisingly, under identical parameters and initial
conditions, the residence time for water droplets is not a constant value but
exhibits dual peaks in its distribution. In this paper, we present the
observation of the dual residence times through rigorous statistical analysis
and investigate the quantitative variations in residence time by manipulating
parameters such as droplet height, radius, and viscosity. Theoretical models
and physical arguments are provided to explain their effects, particularly why
a large viscosity or/and a small radius is detrimental to the appearance of the
longer residence time peak.Comment: 7 pages, 6 figure
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