scattering of an incoming wave train by a discontinuity at the upper surface of the ocean over a uniform porous bottom of finite depth is considered here in the framework of linearized water wave theory. by employing residue calculus method, the reflection and transmission coefficient are obtained. these coefficients are computed numerically for different values of the porosity parameter g and ...

Surface roughness is a significant parameter which determines the efficiency of optical components. Surface damages induced by grinding strongly influence the mechanical strength and optical quality of optical glasses. It is meaningful to rapid evaluate the surface roughness through the measurement of different grinding parameters. In this study, a cup diamond wheel (D64) is used in grinding pr...

Lock–release laboratory experiments are performed to examine saline and particleladen flows down a slope into both constant-density and linearly stratified ambients. Both hypopycnal (surface-propagating) currents and hyperpycnal (turbidity) currents are examined, with the focus being upon the influence of ambient stratification on turbidity currents. Measurements are made of the along-slope fro...

Penetration control is an important factor in determining the weld quality keyhole mode laser welding, which enables deep penetration. In this study, machine learning models and neural network were developed by using 380 published welding data constructed for steel base metals under following conditions: a power of 0.3-16.7 kW, speed 0.3-20.0 m/min, bead diameter 0.05-0.78 mm. A model SVM (supp...

Abstract We employ ionization-parameter mapping (IPM) to infer the optical depth of H ii regions in northern half M33. construct [O iii ] λ 5007/[O 3727 and 5007/[S 6724 ratio maps from narrowband images continuum-subtracted this way, which we classify by ionizing radiation, based on their ionization structure. This method works relatively well low-metallicity regime, <?CDATA $12+\mathrm{log}({...

Optimization of process parameter is one of the ideal goals in laser sintering. The results of this process were measured as output parameters like: density, micro hardening, macro hardening, tension, roughness, stiffness, balling. In this paper, the influence of input parameter such as laser power, scan speed, material powder and etc are surveyed on output parameter like balling affection and ...