Holographic entanglement entropy in metal/superconductor phase transition with Born-Infeld electrodynamics

We investigate the holographic entanglement entropy in the metal/superconductor phase transition for the Born-Infeld electrodynamics with full backreaction and note that the entropy is a good probe to study the properties of the phase transition. For the operator , we find that the entanglement entropy decreases (or increases) with the increase of the Born-Infeld parameter $b$ in the metal (or superconducting) phase. For the operator , we observe that, with the increase of the Born-Infeld parameter, the entanglement entropy in the metal phase decreases monotonously but the entropy in the superconducting phase first increases and forms a peak at some threshold $b_{T}$, then decreases continuously. Moreover, the value of $b_{T}$ becomes smaller as the width of the subsystem $A$ decreases.Comment: 12 pages, 5 figures. arXiv admin note: text overlap with arXiv:1404.1659 by other author

Holographic entanglement entropy in insulator/superconductor transition with Born-Infeld electrodynamics

We investigate the holographic entanglement entropy in the insulator/superconductor phase transition for the Born-Infeld electrodynamics with full backreaction in five-dimensional AdS soliton spacetime. We note that the holographic entanglement entropy is a good probe to study the properties of the phase transition, and the Born-Infeld factor $b$ has no effect on the critical chemical potential $\mu_c$. We find that both in the half space and the belt one, the non-monotonic behavior of the entanglement entropy versus the chemical potential is a general property, and the entanglement entropy increases with the increase of the Born-Infeld factor in the superconductor phase. Particularly, there exists confinement/deconfinement phase transition in the strip geometry and the critical width $\ell_c$ is dependent of the Born-Infeld parameter.Comment: 17 pages, 6 figures, accepted for publication in JHEP. arXiv admin note: text overlap with arXiv:1203.6620 by other author

The Improvement of Motor Cooling Through Stator Profile Optimization using CFD Analysis in Hermetic Scroll Compressors

With the increased pressure of cost, hermetic compressor sizing become an important part of the design optimization process, while maintain the same performance level in the same time. Hermetic compressor motor design also face the same challenge. However, reducing motor size for same compressor capacity will increase the motor power density, with the same motor cooling design as before, motor running temperature will be increased and this affect both motor life and reliability as well as passing UL certification requirement for compressors using OLP ( internal overload protector). Hermetic motor cooling improvement using thermal modelling has been investigated before by using thermal network method, with limited accuracy since this do not taken all thermal correlation between motor and compressors. (refer to Purdue paper: thermal modelling ro the motor in semi-hermetic screw refrigeration compressor under part load conditions) However, the real situation in terms of thermal and fluid distribution which affect motor cooling inside the compressor in much more complicated than a pure thermal lumped circuit can represent. With the usage of fluid and thermal coupled simulation method today, we can simulate and understand more accurately the correlation between motor and compressor heat transfer and fluid distribution to optimize motor cooling channel, both in static and dynamic stage, and keep motor temperature under the accepted level while main a good flow for the overall compressor performance. In this paper, different geometry of stator outer diameter profiles are investigated, to balance between the motor efficiency impacts versus the motor temperature increase, compressor and conclude the optimization in terms of stator outer profile for the compressor structure discussed in this paper. Motor efficiency results are calculated and also tested, motor cooling optimization also calculated and tested inside compressor. From the research work done here, we can see that by using CFD tool (ANSYS), compressor motor design engineers can find the optimal stator lamination design, and understand the biggest influence factor to motor cooling, but not important for motor electromagnetic design and performance. In future, if the design concentrated on the important factors, and optimize the motor cooling, compressor design in terms of sizing and cooling correlation would be well balanced between cost and performance

Quasinormal modes of a scalar perturbation coupling with Einstein's tensor in the warped AdS3AdS_3 black hole spacetime

We have studied the quasinormal modes of a massive scalar field coupling to Einstein's tensor in the spacelike stretched $AdS_3$ black hole spacetime. We find that both the right-moving and left-moving quasinormal frequencies depend not only on the warped parameter $v$ of black hole, but also on the coupling between the scalar field and Einstein's tensor. Moreover, we also discuss the warped $AdS/CFT$ correspondence from the quasinormal modes and probe the effects of the coupling on the left and right conformal weights $h_L$ and $h_R$ of the operators dual to the scalar field in the boundary.Comment: 16 pages, 4 figures, accepted for publication in Phys. Rev.

Salvia miltiorrhiza injection ameliorates myocardial ischemia-reperfusion injury via downregulation of PECAM-1

Purpose: To investigate the effect of Salvia miltiorrhiza injection on myocardial ischemia-reperfusion injury and PECAM-1 related pathways. Method: Male Wistar rats were used for establishment of myocardial ischemia-reperfusion model. The rats were randomly assigned to four groups: experimental group, low dose group (Salvia miltiorrhiza injection, 10 mL/kg/day), moderate dose group (Salvia miltiorrhiza injection, 20 mL/kg/day) and high dose group (Salvia miltiorrhiza injection, 40 mL/kg/day). Myocardial ischemia-reperfusion model was established in the four groups. Evans-TTC staining was used to assess relative area of ischemiareperfusion injury. Blood samples were collected for assay of PECAM-1 expression using enzymelinked immunosorbent assay (ELISA). Fresh blood platelets were collected in all groups, and divided into two groups - control group (normal culture) and experimental group (Salvia miltiorrhiza injection). The expression of PECAM-1 in blood platelets was assayed using Western blot. Result: Compared with the experimental group, Salvia miltiorrhiza injection ameliorated myocardial ischemia-reperfusion injury, and decreased the infarction area seen in Evans/TTC staining. PECAM-1 expression in blood was decreased by Salvia miltiorrhiza injection. Blood platelets dysfunction was induced after myocardial ischemia-reperfusion, and the level of PECAM-1 increased. However, Salvia miltiorrhiza injection treatment downregulated the expression of PECAM-1 after myocardial ischemiareperfusion. Conclusion: Salvia miltiorrhiza injection maintains normal function of blood platelets and ameliorates myocardial ischemia-reperfusion injury by decreasing expression of PECAM-1

Oxidation Degradation of Rhodamine B in Aqueous by UV

The UV photolysis of persulfate (S2O8 2−) is a novel advanced oxidation technologies (AOTs), which leads to the formation of strong oxidizing radicals, sulfate radicals (SO4 •−). The effect of oxidant S2O8 2− concentration, initial dye concentration, initial pH of solution, and various inorganic anions (Cl−, H2PO4 −, and HCO3 −) were investigated using Rhodamine B (RhB), a kind of xanthene dye, as a model pollutant. With the increase of oxidant S2O8 2−, more SO4 •− produced to attack RhB molecules and result in the increase of RhB degradation. While the improvement was not sustained above a critical value, beyond which degradation rate does not increase. Initial pH of solution had great effect on the RhB degradation rate during UV/S2O8 2− system. SO4 •− is rather stable in acidic solutions, while increasing system pH results in the transformation of SO4 •− to •OH. The effects of three inorganic anions (Cl−, H2PO4 −, and HCO3 −) all had some negative effect on the degradation of RhB. Based on the RhB solution changes of the UV-vis absorption intensity during the UV/S2O8 2− treatment, decolorization of RhB accompanied the destruction of aromatic ring structures of RhB molecules