impact pile driving is a multi-component problem which is associated to multi-directional ground vibrations. at first, vibration is transferred from the hammer to the pile and then to the common interface of pile and soil. this is then transferred to the environment and has great impact on the adjacent structures, causing disturbance to residents and also damage to the buildings. it is of high ...

In recent years, coating processes based on the impact of high-velocity solid particles such as cold spraying and aerosol deposition have been developed and attracting much industrial attention. A novel coating process called 'warm spraying' has been developed, in which coatings are formed by the high-velocity impact of solid powder particles heated to appropriate temperatures below the melting...

Impact stresses in flapper valves have been calculated on the basis of a finite element analysis. The impact velocity at initial contact used in the present calculations, 8 m/s, has been taken £rom previous high speed photographic measurements. Our calculations indicate that the final impact velocity at oblique impact exceeds 8 m/s significantly. This "whip-lash effect" gives rise to higher imp...

in this paper the problem on “magnetic fluid lubrication of porous-pivoted slider bearing with slip velocity by n ahmad et.al.[7]” has been recapitulated using jenkin’s model [4] with the additional effect of squeeze velocity of the above plate. it is found that while discussing the above problem, [7] has stated but ignored the term , where +, in their study (refer equation(2.2)). this paper re...

A semiempirical model of single differential cross sections (SDCS) for ionization of water vapor by fast electrons and bare ions is presented. At low secondary-electron energy, the model is based on an asymptotic expansion of the first Born approximation with coefficients, that are independent of projectile properties, evaluated from experimental photoabsorption and protonimpact ionization data...

Promising material properties of GaN, e.g., wide bandgap, high saturation velocity, and high thermal stability, make it an excellent material for high-power, high-frequency, and high-temperature applications. For some specific applications which require the device to operate at elevated temperatures, modeling and simulation provide very meaningful insights about the thermal device behavior. In ...