Mepco Schlenk Engineering College

About: Mepco Schlenk Engineering College is a based out in . It is known for research contribution in the topics: Wavelet & Wavelet transform. The organization has 1307 authors who have published 1665 publications receiving 18690 citations.

Thermal and sensitivity analysis of nano aluminium powder for firework application

Abstract: The performance of the fireworks is governed by the sound level it produces. As per Govt. of India notification, crackers sound level should not exceed 125 dB (AI) or 145 dB(C) pk. In this study, nAl powder was synthesised at different particle sizes of 113, 187 and 218 nm as a fuel. These powders are well mixed with the oxidizer (KNO3) and the igniter (S), and the cake bomb was manufactured with various compositions and checked for their performance. The thermal analysis was performed by DSC and DTA, and the impact sensitivity was analysed for all compositions. The nano-sized chemicals showed high thermal energy content and high sensitivity for various compositions. Further it is observed that the nAl chemical for producing the optimum sound level in the cake bomb has been reduced to 62.5% when compared with μm powder.

Design and simulation of fuzzy controller for closed loop control of chopper fed embedded dc drives

Abstract: This paper proposes an INTEL 8051 microcontroller based fuzzy controller for closed loop control of dc drive fed by dc/dc converter. The controller designed has two loops with an inner current controller and an outer fuzzy speed controller. Computer simulations evaluate (tested) the designed fuzzy controller. The controller is used to change the duty cycle of the converter and thereby, the voltage fed to the armature of the separately excited motor to regulate the speed. The simulated closed loop performance in respect of load variation and set speed change for both fuzzy controller and PID controller has been reported. The simulated results are compared with experimental results by using a buck converter with the fuzzy controller implemented in 8051-based embedded system. The entire system is found to be more advantageous and cost effective.

Synthesis and characterization of calcium phosphate based bioactive quaternary P2O5–CaO–Na2O–K2O glasses

Abstract: Calcium phosphate based bioactive quaternary glass systems P2O5–CaO–Na2O–K2O were prepared by melt growth technique. Glasses were prepared in five different compositions by fixing P2O5 at 47 mol% and CaO at 30.5 mol% and by varying the K2O and Na2O concentrations. The structural properties of the glasses are analyzed using X-ray diffraction (XRD) studies and scanning electron microscopy (SEM) studies; and the composition of the glasses are studied using energy dispersive X-ray spectrum (EDS). The microhardness of the glass systems are studied by Vickers hardness measurements and the bioactivity of the glasses are studied using in vitro study. The thermal properties have been examined by means of thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The ultrasonic velocity measurements show that the addition of K2O contents produces non-bridging oxygen ion and hence weaken of the glass structure. The weakening of the glass structure reduces the ultrasonic velocity and hence an increase in attenuation.