A compact five-element integrated ultrasonic transducer was designed and manufactured for the inspection of defects in split pins control rod guide tubes nuclear power plants. The consists three types elements to detect cracks entire volume pins. In design, two main factors were investigated: coupling confined space measurement sensitivity. experimental results demonstrated that developed has g...

The complex dynamics that lead to the emergence of active regions on the sun are poorly understood. One possibility is that magnetic structures (flux tubes, etc.) rise from below the surface by self induction and convection that lead to the formation of active regions and sunspots on the solar surface. For space weather forecasting, one would like to detect the subsurface structures before they...

The complex dynamics that lead to the emergence of active regions on the Sun are poorly understood. One possibility is that magnetic structures (flux tubes, etc.) rise from below the surface by self induction and convection that lead to the formation of active regions and sunspots on the solar surface. For space weather forecasting, one would like to detect the subsurface structures before they...

A theoretical analysis and experimental investigation of the influence gas pressure on resonance properties, namely, quality factor frequency, a T-shaped quartz tuning fork (QTF) is reported here. Two configurations are considered: bare QTF, QTF coupled with pair resonator tubes (spectrophone). In both configurations, effect air frequency due to additional inertia prong motion damping factor, w...

This paper deals with digital waveguide modeling of wind instruments. It presents the application of state–space representations for the refined acoustic model of Webster–Lokshin. This acoustic model describes the propagation of longitudinal waves in axisymmetric acoustic pipes with a varying cross-section, visco-thermal losses at the walls, and without assuming planar or spherical waves. Moreo...

with the aim of identifying failure mechanism in oriented strand boards, failure behavior of wood strands under tensile load was investigated using acoustic emission technique. resinated and unresinated strands were arranged at top, middle and bottom section of the board before pressing. tensile and acoustic emission tests were performed simultaneously on treated and control samples. using tens...

In response to our incomplete understanding of how the 3-D geometry of the lips should be modeled in 2-D area functions, we present some measurements made on simplified physical models of the vocal tract. Our main result is that it is possible to match the formant pattern of a notched tube with that of an unnotched tube provided that an increment is added to the length of the unnotched tube. Th...