2,196 research outputs found
Modular symmetry origin of texture zeros and quark lepton unification
The even weight modular forms of level can be arranged into the common
irreducible representations of the inhomogeneous finite modular group
and the homogeneous finite modular group which is the
double covering of , and the odd weight modular forms of level
transform in the new representations of . We find that the above
structure of modular forms can naturally generate texture zeros of the fermion
mass matrices if we properly assign the representations and weights of the
matter fields under the modular group. We perform a comprehensive analysis for
the modular symmetry. The three generations of left-handed
quarks are assumed to transform as a doublet and a singlet of , we find six
possible texture zeros structures of quark mass matrix up to row and column
permutations. We present five benchmark quark models which can produce very
good fit to the experimental data. These quark models are further extended to
include lepton sector, the resulting models can give a unified description of
both quark and lepton masses and flavor mixing simultaneously although they
contain less number of free parameters than the observables.Comment: 36 pages, 2 figur
An Application Case Study on Multi-sensor Data fusion System for Intelligent Process Monitoring
AbstractMulti-sensor data fusion is a technology to enable combining information from several sources in order to form a unified picture. Focusing on the indirect method, an attempt was made to build up a multi-sensor data fusion system to monitor the condition of grinding wheels with force signals and the acoustic emission (AE) signals. An artificial immune algorithm based multi-signals processing method was presented in this paper. The intelligent monitoring system is capable of incremental supervised learning of grinding conditions and quickly pattern recognition, and can continually improve the monitoring precision. The application case indicates that the accuracy of condition identification is about 87%, and able to meet the industrial need on the whole
Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting K0.85Fe1.54Se2 (TN=280 K)
We use neutron scattering to study the spin excitations associated with the
stripe antiferromagnetic (AFM) order in semiconducting
KFeSe (= K). We show that the spin wave spectra
can be accurately described by an effective Heisenberg Hamiltonian with highly
anisotropic in-plane couplings at = K. At high temperature (=
K) above , short range magnetic correlation with anisotropic correlation
lengths are observed. Our results suggest that, despite the dramatic difference
in the Fermi surface topology, the in-plane anisotropic magnetic couplings are
a fundamental property of the iron based compounds; this implies that their
antiferromagnetism may originate from local strong correlation effects rather
than weak coupling Fermi surface nesting.Comment: 5 pages, 4 figure
Classical-driving-assisted quantum synchronization in non-Markovian environments
We study the quantum phase synchronization of a driven two-level system (TLS)
coupled to a structured environment and demonstrate that quantum
synchronization can be enhanced by the classical driving field. We use the
Husimi -function to characterize the phase preference and find the in-phase
and anti-phase locking phenomenon in the phase diagram. Remarkably, we show
that the classical driving enables a TLS to reach stable anti-phase locking in
the Markovian regime. However, we find that the synergistic action of classical
driving and non-Markovian effects significantly enhances the in-phase locking.
By introducing the -function and its maximal value to quantify the strength
of synchronization and sketch the synchronization regions, we observe the
typical signatures of the hollowed Arnold tongue in the parameter regions of
synchronization. In the hollowed Arnold tongue, the synchronization regions
exist both inside and outside the tongue while unsynchronized regions only lie
on the boundary line. We also provide an intuitive interpretation of the above
results by using the quasimode theory.Comment: 10 pages, 5 figures, revised versio
Downregulation of the Adenosine A2b Receptor by RNA Interference Inhibits Hepatocellular Carcinoma Cell Growth
To investigate the biological effect of adenosine A2b receptor (A2bR) on the human hepatocellular carcinoma cell line HepG2, three A2bR siRNA constructs were transiently transfected into HepG2 cells. The results showed that A2bR siRNA reduced the levels of A2bR mRNA and protein. In order to further detect the function of A2bR, we established a stable hepatocellular carcinoma cell line (HepG2) expressing siRNA targeting the adenosine A2b receptor. Targeted RNAi significantly inhibited tumor cell growth in vitro, and flow cytometry (FCM) showed that significantly more cells expressing A2bR siRNA were in the G0/G1 phase compared to the untransfected group ((89.56% ± 3.15%) versus (56.19% ± 1.58%), P < 0.01). These results indicated that silencing the expression of adenosine A2b receptor in HepG2 cells can suppress cell growth effectively by blocking the cell cycle. Downregulation of adenosine A2b receptor gene expression with RNA interference could be a new approach to hepatocellular carcinoma therapy
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