Field-dependent quantum nucleation of antiferromagnetic bubbles

The phenomenon of quantum nucleation is studied in a nanometer-scale antiferromagnet with biaxial symmetry in the presence of a magnetic field at an arbitrary angle. Within the instanton approach, we calculate the dependence of the rate of quantum nucleation and the crossover temperature on the orientation and strength of the field for bulk solids and two-dimensional films of antiferromagnets, respectively. Our results show that the rate of quantum nucleation and the crossover temperature from thermal-to-quantum transitions depend on the orientation and strength of the field distinctly, which can be tested with the use of existing experimental techniques.Comment: 21 pages, 5 figures, Final version and accepted by Eur. Phys. J

A Model of Two-Way Selection System for Human Behavior

We propose a model of two-way selection system. It appears in the processes like choosing a mate between men and women, making contracts between job hunters and recruiters, and trading between buyers and sellers. In this paper, we propose a model of two-way selection system, and present its analytic solution for the expectation of successful matching total and the regular pattern that the matching rate trends toward an inverse proportion to either the ratio between the two sides or the ratio of the state total to the smaller people number. The proposed model is verified by empirical data of the matchmaking fairs. Results indicate that the model well predicts this typical real-world two- way selection behavior to the bounded error extent, thus it is helpful for understanding the dynamics mechanism of the real-world two-way selection system.Comment: 8 pages, 4 figure

Prospects of CPCP violation in Λ\Lambda decay with polarized electron beam at STCF

Based on $1.89 \times 10^8$ $J/\psi \rightarrow \Lambda \bar{\Lambda}$ Monte Carlo (MC) events produced from a longitudinally-polarized electron beam, the sensitivity of $CP$ violation of $\Lambda$ decay is studied with fast simulation software. In addition, the $J/\psi \rightarrow \Lambda \bar{\Lambda}$ decay can also be used as a process to optimize the detector response using the interface provided by the fast simulation software. In the future, STCF is expected to obtain 3.4 trillion $J/\psi$ events, and the statistical sensitivity of $CP$ violation of $\Lambda$ decay via $J/\psi \rightarrow \Lambda \bar{\Lambda}$ process is expected to reach $\mathcal O$~$(10^{-5})$ when the electron beam polarization is 80\%

Ginsenoside Rb1 Reduces Nitric Oxide Production via Inhibition of Nuclear Factor-κB Activation in Interleukin-1β- Stimulated SW1353 Chondrosarcoma Cells

Purpose: To investigate the effect and the potential mechanisms of ginsenoside Rb1 on nitric oxide (NO) production in chondrocytes.Methods: SW1353 chondrosarcoma cells were stimulated with interleukin-1β (IL-1β) in the presence of 20, 40, 80 μM ginsenoside Rb1. NO concentration was assessed by the Griess reaction. Expression of inducible nitric oxide synthase (iNOS), content of inhibitor of NF-κB (IκB)α and nuclear level of nuclear factor (NF)-κB p65 were determined by Western blot. DNA binding activity of NF-κB was evaluated with Trans AM™ kit for NF-κB p65.Results: Ginsenoside Rb1 (40 and 80 μM) significantly decreased NO level by 24 (p < 0.05) and 46 % (p < 0.01), as well as iNOS protein expression by 40 and 55 % (p < 0.01), respectively, in IL-1β- stimulated SW1353 cells. Ginsenoside Rb1 (40 and 80 μM) also markedly elevated IκBα protein content by 200 and 260 % (p < 0.01), reduced the nuclear level of p65 protein by 30 and 40 % (p < 0.01), as well as decreased the DNA binding activity of NF-κB by 40 and 50 % (both p < 0.01), respectively, in IL- 1β-stimulated SW1353 cells.Conclusion: These results suggest that ginsenoside Rb1 inhibits IL-1β-induced NO production through downregulation of NF-κB-dependent iNOS expression in chondrocytes, and also underlines the potential mechanisms of ginseng activity in OA treatment of TCM. Keywords: Ginsenoside Rb1, Nitric oxide, Nuclear factor-κB, Chondrocytes, Osteoarthriti

Pollutant diffusion in multiple-face tunnel construction: theoretical analysis and numerical validation

As the length of the tunnel continues to increase, it will be common for a single fan to undertake the ventilation of two or more tunnel faces. However, the construction of multiple faces in a single tunnel will lead to a complex construction environment in the tunnel, the mutual interference of ventilation, and difficulty in discharging pollutants. Based on the simultaneous construction of multiple tunnel faces in a single tunnel, this study analyzed the transport law of pollutants. The diffusion laws of carbon monoxide and dust in multiple-face tunnels under different working conditions were obtained by numerical simulation. It was found that when both sides of the tunnel are ventilated at the same time, the airflow in the tunnel is spiral, the vortex zone will appear near both sides of the face, and the vortex and unstable airflow will appear at the intersection with the inclined shaft. The airflow in the non-equal-length tunnel at both sides is more disordered than that in the equal-length tunnel, and there will be a wider range of eddy currents at the intersection. The change of dust diffusion in the non-equal-length tunnel at both sides is not obvious, and the length of the multiple-face tunnel has little effect on dust settlement and diffusion. The research results are of great significance for improving the construction environment of tunnel faces and improving the working conditions of personnel