Speed Control of DC Motor using Microcontroller 8051 with Circuit Diagram

The aim of developing this project is to control the speed of DC motor. The main advantage in using a DC motor is that the Speed-Torque relationship can be varied to almost any useful form. To achieve the speed control an electronic technique called Pulse Width Modulation is used which generates High and Low pulses. These pulses vary the speed in the motor. For the generation of these pulses a microcontroller (AT89c51) is used. As a microcontroller is used setting the speed ranges as per the requirement is easy which is done by changing the duty cycles time period in the program. Continue reading Speed Control of DC Motor using Microcontroller 8051 with Circuit Diagram

Attenuation Behavior of Solid Dense Random Media at Microwave Frequencies

Abstract :-
To better understand scattering from nontenuous dense random media such as sea ice and snow, attenuation measurements have been performed on two different types of random media with ka values ranging from 0.5 to 0.7, and 1.5 to 2.1. The following paper describes, briefly, experimental results from wave propagation in plane slabs of finite thickness composed of: (1) a random distribution of identical, finite scatters; and (2) a random distribution of scatters with narrow size distribution. Continue reading Attenuation Behavior of Solid Dense Random Media at Microwave Frequencies