Physical Sciences and Engineering

There are various starting methods to start induction motors among them variable frequency System has more advantages. For controlling the speed of the induction motor we are using pwm technique based on current signature techniques as a feedback of closed loop system. For a all control methods rely on the pwm voltage waveform to control the motor. The difference between control methods lies in how they calculate the motors voltage needs at any given moment. Among these methods we are doing v/f control because it has advantages over all other methods.

Teaching Indonesian using a collaborative learning model will enable lecturers to teach values and academic domains simultaneously. The integration of character education in the Indonesian subject is perfectly served to apply the collaborative learning format (a collaborative learning). This study aims to describe the integration of character education in the form of collaborative learning concerned with the Indonesian subject at Yogyakarta-based universities, Indonesia.

Blogs have become an integral part of online culture. They have grown into a massive communication tool used by everyone. Any person from the public can play an active role in the process of collecting, reporting, analyzing and disseminating information on a blog. It is participatory in nature because of user comments attached to news stories. The study which was descriptive in nature dilated upon role of blogging and its contribution to participatory communication. Blogging allows the masses to be a part of the large communication system.

This paper discusses a control scheme of Indirect Matrix Converter which includes space vector modulation to stabilize the frequency variations. The terminal voltage and frequency of any synchronous machine can be controlled easily with this scheme. The proposed method leads to reduction of harmonics and losses predominantly increasing the efficiency of output. More over the control strategy is also very much flexible in their operation at any rated power. This work is mainly focused on the Matlab/Simulink implementation of SVM technique with Zero current switching for IMC.

The telecom industry is a highly competitive market, with frequent innovations required to sustain the business. The current business situation indicates a mismatch between user expectations and tariff plans available in the market. Furthermore, most service providers suffer from a high churn rate. The client (service provider) would therefore like to analyze the market and offer more customized plans that help to increase the retention rate.

The field of remote sensing is a continuously growing market with applications like vegetation mapping and observation of the environment. The increase in applications is due to the availability of high quality images for a reasonable price and improved computation power. However, as a result of the demand for higher classification accuracy and the need in enhanced positioning precision (e.g. for geoscience information systems) there is always a need to improve the spectral and spatial resolution of remotely sensed imagery.

The number and variety of technologies used in teaching and learning has increased exponentially. One of the myriad impacts of these advances on the world is increasing interest in learning foreign languages. However, despite the importance of new technologies and learning tools, some other factors have also had a tremendous impact on teaching and learning. For example, the development of new learning strategies has been a key factor; learning strategies play a key role in learning a foreign language. In this review paper, the author has outlined a map to implement those strategies.

A numerical model is developed to predict the material deformations and temperature histories in the friction stir welding (FSW) process. Based on the numerical ananlysis, the effects of the welding parameters on material deformation and temperatures are investigated for plain cylindrical and drill tool geometries. A numerical result predicts that the temperature can be increased with the increase of the rotating speed on the FSW process. In the same way the increase in the weld speed can also lead to the tangible increase of the input power.

The upgoing trend of research on joining of dissimilar alloys grown the interest on the study and analysis of Friction Stir welding. Joining of different steel groups and Aluminium has been on the research interest on the previous decade. Recent innovative research and development areas is on with Magnesium alloy groups. The Aluminium alloys and Magnesium alloys are investigated for the weld strength with respect to the change of welding parameters including tool geometry, the tool transverse speed, and the tool angular velocity.

The current work contains the load cases and boundary conditions for the stress analysis of chassis using finite element analysis over ANSYS. Shell elements have been used for the longitudinal members & cross members of the chassis. The advantage of using shell element is that the stress details can be obtained over the subsections of the chassis as well as over the complete section of the chassis. Beam elements have been used to simulate various attachments over the chassis, like fuel tank mountings, engine mountings, etc.