4,913 research outputs found
Disorder-free sputtering method on graphene
Deposition of various materials onto graphene without causing any disorder is
highly desirable for graphene applications. Especially, sputtering is a
versatile technique to deposit various metals and insulators for spintronics,
and indium tin oxide to make transparent devices. However, the sputtering
process causes damage to graphene because of high energy sputtered atoms. By
flipping the substrate and using a high Ar pressure, we demonstrate that the
level of damage to graphene can be reduced or eliminated in dc, rf, and
reactive sputtering processes
Doubly charmed baryon decays in the quark model
In this work we study the doubly charmed baryon decays
within the framework of the
non-relativistic quark model (NRQM). Factorizable amplitudes are expressed in
terms of transition form factors, while nonfactorizable amplitudes arising form
the inner -emission are evaluated using current algebra and the pole model
and expressed in terms of baryonic matrix elements and axial-vector form
factors. Nonperturbative parameters are then calculated using the NRQM. They
can be expressed in terms of the momentum integrals of baryon wave functions,
which are in turn expressed in terms of the harmonic oscillator parameters
and for - and -mode excitation.
The measured ratio of the branching fraction of relative to can be
accommodated in the NRQM with and being in
the vicinity of 0.51 and 0.19, respectively, where is the
parameter for and for
. Decay asymmetries are predicted to be and
for and modes, respectively,
which can be tested in the near future. We compare our results with other works
and point out that although some other models can accommodate the ratio ,
they tend to lead to a branching fraction of
too large compared to that inferred from the LHCb measurement of its rate
relative to .Comment: 17 pages, 2 figure
Inherent strain calculation from inverse analysis of measured welding deformation based on python of ABAQUES CAE
Dietary Supplementation of Astaxanthin Improved the Growth Performance, Antioxidant Ability and Immune Response of Juvenile Largemouth Bass (Micropterus salmoides) Fed High-Fat Diet
High-fat diet (HFD) usually induces oxidative stress and astaxanthin is regarded as an excellent anti-oxidant. An 8-week feeding trial was conducted to investigate the effects of dietary astaxanthin supplementation on growth performance, lipid metabolism, antioxidant ability, and immune response of juvenile largemouth bass (Micropterus salmoides) fed HFD. Four diets were formulated: the control diet (10.87% lipid, C), high-fat diet (18.08% lipid, HF), and HF diet supplemented with 75 and 150 mg kg−1 astaxanthin (HFA1 and HFA2, respectively). Dietary supplementation of astaxanthin improved the growth of fish fed HFD, also decreased hepatosomatic index and intraperitoneal fat ratio of fish fed HFD, while having no effect on body fat. Malondialdehyde content and superoxide dismutase activity were increased in fish fed HFD, astaxanthin supplementation in HFD decreased the oxidative stress of fish. The supplementation of astaxanthin in HFD also reduced the mRNA levels of Caspase 3, Caspase 9, BAD, and IL15. These results suggested that dietary astaxanthin supplementation in HFD improved the growth performance, antioxidant ability and immune response of largemouth bass.publishedVersio
Holographic Superconductor on Q-lattice
We construct the simplest gravitational dual model of a superconductor on
Q-lattices. We analyze the condition for the existence of a critical
temperature at which the charged scalar field will condense. In contrast to the
holographic superconductor on ionic lattices, the presence of Q-lattices will
suppress the condensate of the scalar field and lower the critical temperature.
In particular, when the Q-lattice background is dual to a deep insulating
phase, the condensation would never occur for some small charges. Furthermore,
we numerically compute the optical conductivity in the superconducting regime.
It turns out that the presence of Q-lattice does not remove the pole in the
imaginary part of the conductivity, ensuring the appearance of a delta function
in the real part. We also evaluate the gap which in general depends on the
charge of the scalar field as well as the Q-lattice parameters. Nevertheless,
when the charge of the scalar field is relatively large and approaches the
probe limit, the gap becomes universal with which is
consistent with the result for conventional holographic superconductors.Comment: 20 pages, version to appear in JHE
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