Investigation of fatigue-crack growth under simple variable-amplitude loading

Fatigue-crack growth under simple variable amplitude loading in aluminum alloy

A study of methods of prediction and measurement of the transmission of sound through the walls of light aircraft

The acoustic intensity technique was applied to the sound transmission loss of panel structures (single, composite, and stiffened). A theoretical model of sound transmission through a cylindrical shell is presented

Varying Vector Pulse Width Modulation for Three Phase Inverter

This paper mainly deals with designing a control scheme to eliminate the OFF STATE (T0 state) present in a Space Vector Pulse-Width Modulation; this has been achieved by redesigning the equations for calculating the reference vector of modulating signal (Vref). In widely used Space Vector Pulse Width Modulation Vmax of carrier signal is greater than Vref of modulating signal (except when Vref = Vmax). Thus during this state the drive goes into the OFF STATE (T0 state). T0 States are similar mirror image states; hence they have no good or bad effect on the system. But there is an amount of switching loss occurring when the switch executes the T0 state. The new equations for reference vector resulted in reducing the switching losses to half the actual value. Also it has various other advantages like. Increase in DC-Link utilization from 15.47 to 21.14 at 2 KHz carrier frequency and Reduction in THD of the system compared to widely used SVPWM

Effectiveness of English Multimedia Assisted Instructional Package in Enhancing Achievement in English among Standard IX Students in Relation to their Interest in Learning

According to today’s pedagogical practices, the key to engagement of students and the effectiveness of the procedure is through ICT. This paper analyses the implications that multimedia assisted instructional package have in enhancing the achievement of Class IX students in learning. The paper envisages that the application of ICT in pedagogy can enhance the interest of students in English Learning