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Madhu, B.
- A Self-Powered AC to DC Converter for Low Voltage Energy Harvesting Applications
Authors
1 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Pillaichavady, Puducherry-605014, IN
Source
Programmable Device Circuits and Systems, Vol 4, No 8 (2012), Pagination: 400-406Abstract
In this paper, a new design methodology for low voltage electromagnetic energy harvesting systems consisting of a microgenerator and power processing circuit is introduced. The proposed converter consists of a boost converter in parallel with a buck–boost converter. The output DC bus is realized by using a single capacitor. The output capacitor is charged by the boost converter in the positive half cycle and by the buck-boost converter in the negative half cycle. Concerning the power efficiency, the effectiveness of the proposed converter is clarified by theoretical analysis. Furthermore, the validity of the circuit design is confirmed by simulations and analysis.Keywords
AC-DC Power Conversion, Boost Converter, Energy Harvesting, Low Power and Low Voltage.
- Accelerated Storage and Shelf-Life of Whey Protein Concentrate and Gum Arabic Coated Solid Jaggery
Authors
1 Department of Agricultural Processing and Food Engineering, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.), IN
2 AICRP on Post-Harvest Engineering and Technology, Regional Agricultural Research Station, Anakapalle (A.P.), IN
Source
International Journal of Processing and Post harvest Technology, Vol 8, No 2 (2017), Pagination: 59-68Abstract
Sugarcane jaggery samples (25 g) were coated with the optimized concentration of edible coating (0.5% WPC and 0.5% gum arabic) and placed in LDPE, HDPE and PP pouches packed thenine pouches (three LDPE pouches, three HDPE and three PP pouches) with MAP machine. The samples were analyzed for important physico-chemical characteristics viz., sucrose, reducing sugars, colour, Hardness and moisture content. The whey protein coated solid jaggery stored in PP packets under vacuum was found to be better i.e., low increase in reducing sugars and decrease in non-reducing sugars, as compared to the samples packed in LDPE, HDPE under vacuum and MAP at storage temperature of 25°C. Accelerated storage studies were conducted for the sugarcane solid jaggery samples (50 g) coated with optimized concentration of edible coating (0.5% concentration of both protein (WPC) and polysaccharide (gum arabic) based) placed in LDPE, HDPE and PP pouches with vacuum and MAP packing and all these pouches were placed in the desiccator at 90% RH and this desiccator was kept in incubator at 45p C. The maximum predicted storage life i.e. 255.44 days was obtained in the 0.5% WPCedible coated solid jaggery packed in LDPE with vacuum packaging machine.Keywords
Jaggery, Edible Coating, Whey Protein, Gum Arabic, Accelerated Storage Studies.References
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- Statistical Analysis of M-Mode Echocardiographic Normal Reference Values in South Indian Adults
Authors
1 Department of Water and Health, Faculty of Life Sciences, JSS Academy of Higher Education & Research, IN
2 Department of Community Medicine, JSS Medical College & Assistant Director Research, JSS Academy of Higher Education & Research, IN
3 Department of Water and Health, JSS Academy of Higher Education & Research, IN
4 Department of Cardiology, JSS Hospital, Mysuru, Karnataka, IN
Source
Indian Journal of Public Health Research & Development, Vol 10, No 12 (2019), Pagination: 24-29Abstract
Background: Normal values for echocardiographic measurements are derived from American Society of echocardiography and European Society of Cardiology/European Association of Cardio-Vascular Imaging and their publications. Indians have smaller cardiac chamber dimensions than the Europeans. However, it has been long felt that reference range from western data cannot be fully applied in our scenario.
Aim: The objective of this study was to develop age and gender-specific normative reference range values for echocardiography measurements.
Methodology: This was a retrospective cross-sectional single-center study conduct on 111 healthy Indian adults who were selected out of the 336 patients aged from 18– 76 years, who visited the cardiac medical check-up unit in a tertiary hospital. Echocardiograms were done in participants free of cardiovascular diseases, hypertension, diabetes, high blood pressure or other clinical evident disorders. M-mode Echocardiography in the left parasternal long-axis view was used to measure aorta, left atrium, left ventricle in systole and diastole,right ventricle, interventricular septum, and posterior wall thickness. The 95% reference range of the echocardiographic parameters calculated as a mean±2 “standard deviation for overall and genders specific”.
Results: This study provides a set of data with reference ranges for normal M-mode parameters according to age and gender. Around 58 males and 53 females were classified into the age group from 18-76 years as exclusive class intervals. Age group above of 38 years Indians had higher volume in all the echocardiographic measurements are observed in this study. On examining all our healthy participants, we found that the reference range of most echocardiographic parameters is a highly statistically significant difference as compared with those used in western studies.
Conclusion: The normal reference values for echocardiographic measurements derived from this study could be used for future reference in our local population.