Chiral phase transition and meson spectrum in improved soft-wall AdS/QCD

We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained

The Effect Of Humble Leader Behavior, Leader Expertise, And Organizational Identification On Employee Turnover Intention

As a bottom-up leadership style, humble leadership has attracted increasing attention from scholars in recent years. But its effectiveness and mechanism still lack rigorous empirical study. In this study, we investigate the mechanism and boundary condition by which humble leader behavior exerts influence on followers’ turnover intention. Two-wave data collected from 249 scientific and technological personnel in China supported our hypothesized model. We found that humble leader behavior is significantly negatively related to follower turnover intention. The relationship is further partially mediated by organizational identification, and moderated by leader expertise. Implications for theory, practice and future research are discussed.

A consistent analysis on QCD phase diagram and meson spectra in the improved soft-wall AdS/QCD

We present a consistent analysis on QCD phase diagram and meson spectra based on the improved soft-wall AdS/QCD. The equations of motion for the octet pseudoscalar, vector and axial-vector mesons with $2+1$ flavors are derived to calculate the octet meson spectra and relevant decay constants, by which the model parameters are determined. The chemical potential effects on chiral thermal transition are investigated, which enables us to obtain the QCD phase diagram in the $\mu-T$ plane. It is shown that the critical end point (CEP) linking the crossover transition with the first-order phase transition still exists and locates at $(\mu_B, T_c) \simeq (390 MeV, 145 MeV)$. The crossover line and the location of CEP resulted from the model agree with both the lattice result and the experimental analysis from relativistic heavy-ion collisions. We find that the improved soft-wall AdS/QCD model can provide a consistent description for both the chiral phase diagram and the main properties of low-energy hadron physics in the $2+1$ flavor case

Probing the structural evolution along the fission path in the superheavy nucleus 256^{256}Sg

The evolution of structure property along the fission path in the superheavy nucleus $^{256}$Sg is predicted through the multi-dimensional potential-energy(or Routhian)-surface calculations,in which the phenomenological deformed Woods-Saxon potential is adopted. Calculated nuclear deformations and fission barriers for $^{256}_{106}$Sg$_{150}$ and its neighbors, e.g., $^{258,260}$Sg, $^{254}$Rf and $^{252}$No are presented and compared with other theoretical results. A series of energy maps and curves are provided and used to evaluate the corresponding shape-instability properties, especially in the directions of triaxial $\gamma$ and different hexadecapole deformations (e.g., $\alpha_{40}$, $\alpha_{42}$ and $\alpha_{44}$). It is found that the triaxial deformation may help the nucleus bypass the first fission-barrier of the axial case. After the first minimum in the nuclear energy surface, the fission pathway of the nucleus can be affected by $\gamma$ and hexadecapole deformation degrees of freedom. In addition, microscopic single-particle structure, pairing and Coriolis effects are briefly investigated and discussed.Comment: 26 pages, 10 figure

Dynamic analysis of offshore wind turbine blades under the action of wind shear and fluctuating wind

Aiming at large-scale offshore wind turbine blades, governing equations in fluid domain and motion equations in structural domain with geometric nonlinearity were built by the aid of ALE method. A three dimensional model under fluid-structure interaction (FSI) was established by using UG software and Geometry module, and numerical calculation for FSI vibration characteristics of wind turbine blades under the effects of wind shear and fluctuating wind was carried out based on ANSYS Workbench. The results indicate that the contribution of the combined action to displacement and Mises stress chiefly derives from the wind shear effect, which not only causes a comparatively larger increase for the maximum displacement and Mises stress, but also becomes bigger and bigger with the increase of average wind speed, and the fluctuating wind effect is insignificant. The maximum value of Mises stress in the blade section appears at the relative wingspan of 0.55, the maximum Mises stress varying with relative span length decreases progressively from the middle to both sides of the blade, and the contribution of wind shear effect alone, the combined action or wind speed increment to stress also shows the same change rule. Furthermore, in the maximum stress section along wingspan, Mises stress along the direction of blade thickness or chord length respectively presents two distribution laws, and reaches the maximum on the blade surface