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Daisy Rani, A.
- Nutritional Status of the Children Living in Selected Service Institutions
Authors
1 Department of Food Service Management and Dietetics, Avinashilingam University for Women, Coimbatore- 641 043, IN
Source
The Indian Journal of Nutrition and Dietetics, Vol 47, No 3 (2010), Pagination: 87-93Abstract
Children contribute to the vital human potential and impart strength to the national economy and development. Better the nutritional status of the children, higher will be the nation's growth. Nutrition in childhood is the basis for survival and good health in adulthood.- Design and Analysis of A Four Beam MEMS Piezoelectric Accelerometer
Authors
1 Instrument Technology, Andhra University, Visakhapatnam, Andhra Pradesh, 530003, IN
2 CSE Department, Chaitanya Engineering College, Visakhapatnam, Andhra Pradesh, 530003, IN
Source
Programmable Device Circuits and Systems, Vol 1, No 8 (2009), Pagination: 214-218Abstract
Piezoelectricity is a phenomenon in which applied mechanical stress produces a electrical polarization and reciprocally an applied electric field produces a mechanical strain. The piezoelectric micro accelerometers have wide applications in the field of auto mobiles, inertial navigation and bio medical instrumentation. A bulk - micro machined quad beam piezoelectric accelerometer is proposed, designed and analyzed. The main application of this proposed accelerometer is in Bio Medical field. The most important specifications for medical applications are amplitude range +/-5g. resolution 10 -3g, bandwidth d.c.-50 Hz, off axis sensitivity < 5%, dimensions < 2 mm x 2 mm× 2 mm, low drift and power consumption < 1mW. The accelerometer design employs a single silicon seismic mass suspended by four beams. The beams of the accelerometers use the bimorph structure with two PZT films of piezoelectric material and poly silicon as the supporting layer. As the mass moves relative to the anchor, the beams deflect causing the piezoelectric layers to deform and hence a charge is induced. .The amount of charge generated depends upon the piezoelectric properties of PZT material, and many dimensional design considerations. This design is proved to get very high sensitivity, good frequency response and low cross axis sensitivity.
The Z-Axis sensitivity is found to be 4.4X10-14 Col/m/sec2 and X-/Y Axis sensitivities are found to be1.4X10-14Col/m/sec2 with very low cross axis sensitivity.