3,522 research outputs found
A Possibility of Search for New Physics at LHCb
It is interesting to search for new physics beyond the standard model at
LHCb. We suggest that weak decays of doubly charmed baryon such as
to charmless final states would be a possible
signal for new physics. In this work, we consider two models, i.e. the
unparticle and as examples to study such possibilities. We also discuss
the cases for which have not been observed yet, but
one can expect to find them when LHCb begins running. Our numerical results
show that these two models cannot result in sufficiently large decay widths,
therefore if such modes are observed at LHCb, there must be a new physics other
than the unparticle or models.Comment: 7 pages, 3 figures, 1 table. More references and discussion adde
Steady Bell state generation via magnon-photon coupling
We show that parity-time () symmetry can be spontaneously
broken in the recently reported energy level attraction of magnons and cavity
photons. In the -broken phase, magnon and photon form a
high-fidelity Bell state with maximum entanglement. This entanglement is steady
and robust against the perturbation of environment, in contrast to the general
wisdom that expects instability of the hybridized state when the symmetry is
broken. This anomaly is further understood by the compete of non-Hermitian
evolution and particle number conservation of the hybridized system. As a
comparison, neither -symmetry broken nor steady magnon-photon
entanglement is observed inside the normal level repulsion case. Our results
may open a novel window to utilize magnon-photon entanglement as a resource for
quantum technologies.Comment: 5 pages, 4 figure
4-(4-NitroÂbenzeneÂsulfonamido)pyridinium trichloroÂacetate
In the title compound, C11H10N3O4S+·C2Cl3O2
−, the benzene ring forms an angle of 85.21 (13)° with the pyridinium ring. The nitro group is nearly coplanar with its attached benzene ring [dihedral angle = 3.68 (12)°]. In the crystal structure, strong N—H⋯O hydrogen bonds link the ion-pairs. The packing is further consolidated by weak C—H⋯O interÂations
Creating One-dimensional Nanoscale Periodic Ripples in a Continuous Mosaic Graphene Monolayer
In previous studies, it proved difficult to realize periodic graphene ripples
with wavelengths of few nanometers. Here we show that one-dimensional periodic
graphene ripples with wavelengths from 2 nm to tens of nanometers can be
implemented in the intrinsic areas of a continuous mosaic, locally N-doped,
graphene monolayer by simultaneously using both the thermal strain engineering
and the anisotropic surface stress of Cu substrate. Our result indicates that
the constraint imposed at the boundaries between the intrinsic and the N-doped
regions play a vital role in creating these 1D ripples. We also demonstrate
that the observed rippling modes are beyond the descriptions of continuum
mechanics due to the decoupling of graphene bending and tensional deformations.
Scanning tunneling spectroscopy measurements indicate that the nanorippling
generates a periodic electronic superlattice and opens a zero-energy gap of
about 130 meV in graphene. This result may pave a facile way for tailoring the
structures and electronic properties of graphene.Comment: 4 Figures, to appear in Phys. Rev. Let
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Dexmedetomidine post-treatment attenuates cardiac ischaemia/reperfusion injury by inhibiting apoptosis through HIF-1α signalling.
Hypoxia-inducible factor 1α (HIF-1α) plays a critical role in the apoptotic process during cardiac ischaemia/reperfusion (I/R) injury. This study aimed to investigate whether post-treatment with dexmedetomidine (DEX) could protect against I/R-induced cardiac apoptosis in vivo and in vitro via regulating HIF-1α signalling pathway. Rat myocardial I/R was induced by occluding the left anterior descending artery for 30 minutes followed by 6-hours reperfusion, and cardiomyocyte hypoxia/reoxygenation (H/R) was induced by oxygen-glucose deprivation for 6 hours followed by 3-hours reoxygenation. Dexmedetomidine administration at the beginning of reperfusion or reoxygenation attenuated I/R-induced myocardial injury or H/R-induced cell death, alleviated mitochondrial dysfunction, reduced the number of apoptotic cardiomyocytes, inhibited the activation of HIF-1α and modulated the expressions of apoptosis-related proteins including BCL-2, BAX, BNIP3, cleaved caspase-3 and cleaved PARP. Conversely, the HIF-1α prolyl hydroxylase-2 inhibitor IOX2 partly blocked DEX-mediated cardioprotection both in vivo and in vitro. Mechanistically, DEX down-regulated HIF-1α expression at the post-transcriptional level and inhibited the transcriptional activation of the target gene BNIP3. Post-treatment with DEX protects against cardiac I/R injury in vivo and H/R injury in vitro. These effects are, at least in part, mediated via the inhibition of cell apoptosis by targeting HIF-1α signalling
Double-Sided Passivated Contacts for Solar Cell Applications: An Industrially Viable Approach Toward 24% Efficient Large Area Silicon Solar Cells
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