Dimensional Accuracy Analysis of Samples Printed in Delta and Cartesian Kinematic Three Dimensional Printers

A Three-dimensional Kinematic Analysis of the Volleyball Jump Serve

INTRODUCTION The serve is the first attacking weapon in the modem game of volleyball. Since the late 1980's (although pioneered by the Brazilians a decade earlier), the most powerful form of service has been the 'jump,' or attack, serve. As its name suggests, this serve consists of the player throwing the ball into the air from the baseline, and then jumping into court to smash it towards the o...

Improvement of Accuracy in Environmental Dosimetry by TLD Cards Using Three-dimensional Calibration Method

Background: The angular dependency of response for TLD cards may cause deviation from its true value on the results of environmental dosimetry, since TLDs may be exposed to radiation at different angles of incidence from the surrounding area.Objective: A 3D setting of TLD cards has been calibrated isotropically in a standard radiation field to evaluate the improvement of the accuracy of meas...

Dynamic Analysis of Three Dimensional Asymmetric Isolated Structures

Three Dimensional Stability Analysis of a Liquid Propellant Combustor

A theoretical study analyzing three-dimensional combustion acoustic instabilities in a liquid propellant rocket engine combustor has been conducted. A linear theory based on Crocco’s pressure sensitive time lag model is used. To apply this theory the combustor is divided into two main components, including the combustion chamber and the converging part of the nozzle. The assumption of concentra...

Three Dimensional Analysis of Laminated Cylindrical Panels with Piezoelectric Layers

A semi-analytical solution is presented for three dimensional elastic analysis of finitelylong, simply supported, orthotropic, laminated cylindrical panels with piezoelectric layers subjected to outer pressure and electrostatic excitation. Both the direct and inverse piezoelectric effects are investigated. The solution is obtained through reducing the highly coupled partial differential equatio...