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Premalatha, R.
- An Three-Level PWM ZVS DC-DC Converter with C and π Filters
Authors
1 Sathyabama University, Chennai, IN
2 S.A Engineering College, Chennai, IN
Source
Digital Signal Processing, Vol 6, No 4 (2014), Pagination: 132-136Abstract
This paper deals with modeling and simulation of Zero Voltage Switching Pulse Width Modulation Three Level DC to DC Converter for Open Loop Operation with C and π-Filter . DC Input voltage of 220V is stepped down to 48V using an efficient DC to DC Converter. Direct current is converted into high frequency Alternating current using Three Level Inverter. The Output of Inverter is stepped down and converted into DC using an controlled rectifier. This circuit has advantages like reduced transformer size and reduced filter requirement. The oscillations and voltage stress of the input voltage is reduced by the two clamping diodes ,in the meanwhile, all the switches turn on and off at zero voltage in this paper. The Operation principle of open loop DC-DC converter with π-Filter was analysed.Keywords
Pulse-Width-Modulation, Soft-Switching, Three-Level Converter, Zero Voltage Switching.
- A Study on Changing Family Structure in Tamilnadu
Authors
1 Department of Economics, VELS Institute of Science, Technology and Advanced Studies, Chennai, IN
Source
Indian Journal of Public Health Research & Development, Vol 10, No 12 (2019), Pagination: 440-443Abstract
The traditional values were losing importance and new thinking new values were adding in society. Men and women will be treating equal in modern era. The new health treatment and facilities were opened to serve village people’s health sector. All individuals were given equal opportunity in society. The village people’s way of life, structure of the family has been changed because of impact of liberalization privatization and globalization in our country. The family has also been influenced by the effects of Globalization. Though it is the fact that processes like-Industrialization and Modernization have influences the traditional structure of family in the early years, but the changes have been rapid in the recent years on the Indian rural society, which has also passed through Globalization and Information. The data for this paper is obtained from the Household questionnaire, which contains information, related to age, sex, marital status, education, occupation and relationship to the head of the household for all usual residents as well as for the visitors who slept last night in the house. The family has been and continues to be one of the most important elements in the fabric of Indian society. The bond that ties the individual to his family, the range of the influence and authority that the family exercises make the family in India not merely an institutional structure of our society, but accord give it a deep value. The Indian family is subjected to the effects of changes that have been taking place in the economic, political, social and cultural spheres of the society.Keywords
Family Structure, Change in Culture, Impact of Society.- Economic Development and Employment Creation in India
Authors
1 Department of Economics, VELS Institute of Science, Technology and Advanced Studies, (Deemed to be University) Chennai, IN
Source
Indian Journal of Public Health Research & Development, Vol 10, No 12 (2019), Pagination: 456-459Abstract
Employment has featured as an important item in the development agenda in India. Approaches to the subject have, however, varied in different periods during the last over 50 years. In the initial years of development planning, unemployment was not expected to emerge as a major problem. Yet care was taken to see that employment of a reasonable magnitude is generated in the development process to productively employ the growing labour force. A reasonably high rate of economic growth combined with an emphasis on labour intensive sectors like the small scale industry was envisaged to achieve this goal.
To analyze the trend and to estimate the growth rates of the employment in different organized sectors of India, simple linear regression model and semi-log linear regression model have been fitted respectively to the data on the organized sector for the periods 1990-91 to 2009-10. The estimated value of the regression co-efficient, their standard error and other important results are given. Employment in mining and quarrying sector increased by 0.072 lakh persons per year. The manufacturing sector’s employment increased by 0.389 lakh persons annually.