One-dimensional backreacting holographic p-wave superconductors

We analytically as well as numerically study the properties of one-dimensional holographic p- wave superconductors in the presence of backreaction. We employ the Sturm-Liouville eigenvalue problem for the analytical calculation and the shooting method for the numerical investigations. We apply the AdS3/CFT2 correspondence and determine the relation between the critical temperature Tc and the chemical potential \mu for different values of mass m of charged spin-1 field and backreacting parameters. We observe that the data of both analytical and numerical studies are in good agreement. We find out that increasing the backreaction as well as the mass parameter cause the greater values for Tc/ \mu. Therefore, it makes the condensation harder to form. In addition, the analytical and numerical approaches show that the value of the critical exponent \beta is 1/2 which is the same as in the mean field theory. Moreover, both methods confirm the exhibition of a second order phase transition

Computational fluid dynamics (CFD) simulations of molten steel flow patterns and particle-wall adhesion in continuous casting of steels

In this research, the measurements of clog deposit thickness on the interior surfaces of a continuous casting nozzle were compared with Computational Fluid Dynamics (CFD) predictions of melt flow patterns and particle-wall interactions to identify the mechanisms of nozzle clogging. A hybrid turbulent approach, Detached Eddy Simulation (DES), was configured to simulate both turbulent structures and particle-wall interactions inside the nozzle accurately. For experimental measurements of nozzle clogging, a nozzle received from industry was encased in epoxy and carefully sectioned to allow measurement of the deposit thickness on the internal surfaces of the nozzle. CFD simulations of melt flow patterns and particle-wall adhesion inside the nozzle were performed applying the geometry and operating conditions of the industrial test. The simulation results indicated that the hybrid DES model incorporates both advantages of Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) models which are suitable for modeling wall bounded and transient turbulent flows, respectively. Also, the CFD results showed that the convergent areas of the interior cross section of the nozzle increased the velocity and turbulence of the steel flow inside the nozzle, and decreased the clog deposit thickness locally in those areas. The simulations predicted a higher rate of attachment of particles in the divergent area between two convergent sections of the nozzle, which matched the observations made in the industrial nozzle measurements. Additionally, a mathematical model is proposed for adhesion of particles, to the nozzle wall. This model provides a particle-wall adhesion criterion by considering the presence of external forces, physical characteristics of both wall and particle (e.g. hardness, Young\u27s modules), and the effect of internal forces (e.g. Van Der Waals) --Abstract, page iv

Studying the Relationship between Personality Types and Leadership Style

The purpose of the present paper is to study the relationship between the managers’ personality types and the leadership style of managers. The method is descriptive-correlational investigation and its goal is applied. The statistical universe includes all of the academic course managers of Tabriz 4th area of which 82 ones were selected randomly and the information was collected through standard questionnaires of personality type leadership style. To analyze the data, the descriptive- inferential statistical methods were used. The results indicate that there is no significant relationship between the emotional and intuitive extroversion and relation-oriented leadership style, the thinking extraversion as well as between the emotional, intuitive and thinking introversion and the relation-oriented leadership style. However, there is a relationship between the thinking and sensational extroversion and the relationship-oriented leadership style, the sensational and intuitive extroversion and functionalistic leadership style as well as between the emotional introversion and the relationship-oriented and functionalistic leadership style, and between the thinking, emotional and intuitive introversion and the functionalistic leadership style

A prototype calibration target for spectral imaging

A prototype calibration target was designed and tested for spectral imaging that consisted of 14 samples, nine of which were derived from statistical analyses of artist paints and a five-step grey scale. This target was compared with those commonly used when calibrating spectral-imaging systems. An Esser TE221 scanner target, GretagMacbeth ColorChecker DC, GretagMacbeth ColorChecker Color Rendition Chart, and the prototype target were used as both calibration and verification targets using a modified commercial color-filter-array digital camera as a spectralimaging device. When evaluating a verification target made from 30 different pigments, the prototype target had equivalent performance. Thus for spectral imaging, the spectral properties are more important than the number of samples or its colorimetric range of colors