We study the sonic horizon phenomena of the oscillating Bose-Einstein condensates in isotropic harmonic potential. Based on the Gross-Pitaevskii equation model and variational method, we derive the original analytical formula for the criteria and lifetime of the formation of the sonic horizon, demonstrating pictorially the interaction parameter dependence for the occur- rence of the sonic horiz...

The Visibility of Petroleum Exploration Data in Italy (ViDEPI) project represents a freely accessible valuable resource for the research community. However, seismic profiles available from this present several limitations because information such as basic shape wavelets and polarity are not available. In study, using subsurface (i.e., 2D profiles) data related to Marine Zones B, D F (offshore P...

Near a borehole, stress concentration effects may cause a complex spatial variation of elastic anisotropy. Stress-induced sonic anisotropy results when moduli and velocities are stress dependent and the state of stress is nonhydrostatic. For such cases, the appropriate material model is that of an elastic orthorhombic medium with material axes aligned with the principal axes of stress. We simul...

We revisit two recent methodologies based on Monin–Obukhov Similarity Theory (MOST), the 2D method and Hybrid-Wind (HW), which are aimed at estimation of Obukhov length, friction velocity kinematic heat flux within surface layer. Both methods use wind-speed profile measurements only their comparative performance requires assessment. Synthetic observational data used for quantitative also presen...

In this paper we study existence of traveling waves for 1-D compressible Euler system with dispersion (which models quantum effects through the Bohm potential) and nonlinear viscosity in context hydrodynamic superfluidity. The profiles is proved appropriate (super– or sub– sonic) end states defining Lax shocks underlying formulated terms density velocity without restrictions parameters. On othe...

The stationary hydrodynamic equations for the transonic accretion disks and flows around rotating black holes are presented by using the Kerr-Schild coordinate where there is no coordinate singularity at the event horizon. We use two types of the causal viscosity prescription, and the boundary conditions for the transonic accretion flows are given at the sonic point. For one type of the causal ...

Electron material waves cannot permeate a periodic atomic lattice at each energy or frequency. There exists forbidden gap due to the periodicity of atoms. In analogy, acoustic penetrate phononic sonic crystal A two-dimensional consists cylinders. The is adjusted according wavelength sound. Depending on frequency, there exist “allowed” bands with propagation as well “forbidden” band without corr...

A computational fluid dynamics (CFD) model of the air flow generated by an air-assisted sprayer equipped with two axial fans was developed and validated by practical experiments in the laboratory. The CFD model was developed by considering the total air flow supplied by the sprayer fan to be the main parameter, rather than the outlet air velocity. The model was developed for three air flows cor...

Historical masonry structures made from locally available materials such as stone, brick, and mud are an integral part of our cultural identity. Moisture content is a critical environmental factor that can significantly impact the durability strength these structures. ingress in cause detrimental effects decreased strength, increased porosity, reduced bond between mortar units. Understanding th...