The ionic conductivity of alkali aluminum germanium phosphate glasses – comparison of Plasma CAIT with two electrode DC measurements

The ionic conductivity of alkali aluminum germanium phosphates (MAGP) has been investigated by two different techniques, i.) a fs-Plasma-Charge Attachment Induced Transport (CAIT) approach and ii.) a classical two electrode DC approach. Amorphous MAGP samples of the composition M1.5Al0.5Ge1.5(PO4)3 M=(Li–Cs) have been synthesized by the melt-quenching technique. Comparison of fs-Plasma-CAIT and DC data reveal that the ionic conductivities as well as the activation energies for ion transport agree within the error margins of the experiment. While conventional expectation suggests that a DC approach should fail because of spontaneous charge carrier blocking, this work demonstrates that DC measurements are a simple tool for quantifying ionic conductivities provided that only a small amount of charge has been transported in total.

Crack Commencement and Transmissionan Alysison Heavy Vehicle Propeller Shaft by using Wavelet Transform

Present work gives an overview of cracks determination in material usingnatural frequency and wavelet transformation method and its application tocurrent engineering problems. In this technique, comparison between actualnatural frequency (without crack) and frequency due to crack propagation ismade using Euler Beam theory. When cracks are present in structure, natural frequency of material deviates from its original frequencyandresultdifference will measure in term of crack. Whole analysis procedure starting from modeling, meshing and resul tinterpretation done on well-known numerical tool ANSYS. The main aim of proposed study is to detect critical areas especially crack initiativezone before doing actual fabrication of components and avoid the breakage of it. Effects of a breathing crack on thevibratory characteristics of a rotating propeller shaft are investigated. Here three types of load consideration have taken such as axial, bending and torsionloadings. Results of numerical Finite Element Method (FEM) are validatedusingnumericalresultshasdoneusing MATLAB.