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Northeast India and its adjoining region constitutes an important geotectonic element of Southeast

A flexible and easily processable polymer composite is developed from naturally occurring piezoelectric materials for efficient energy-harvesting applications. Tomato peel (TP)- and cotton (CTN)-based poly(vinylidene fluoride) (PVDF) composites have been prepared and the role of induced electroactive phases have been explored through structural, thermal, and morphological analyses for their applications in energy production. The mechanism of induced piezoelectricity is vividly demonstrated using electromechanical responses and characteristic changes due to induction phenomena. The CTN-based composite generates a maximum output voltage and current of 65 V and 2.1 μA, respectively, as compared to the maximum output voltage and current of 23 V and 0.7 μA in TP-based composites due to the significant induction of the piezoelectric phase in the presence of suitable electroactive cotton. The fabricated device is able to store charges in capacitors and converts the external stress through different motions of the human body to generate a considerable output, which describes the applicability of the material and justifies the potential as an efficient and sustainable biomechanical energy harvester.

Richter gave an empirical relation between surface wave (Rayleigh Waves) magnitude , Ms, and body wave magnitude, mb, (generally short P type body waves of period 1 sec). At the outset, we have tried to modify the Richter's relation by taking into account of the earthquake data of the NorthEast India and its adjoining region. Then we analyse the applicability of surface wave magnitude scale and body wave magnitude scale for the seismicity study of the region. Lastly the completeness of the earthquake datafile is checked. Various statistical methods are adopted in this present study. It has been seen that there is not much difference between the values of surface wave magnitude obtained from Richter's relation and modified Richter's relation. Since error is less,it would be better if modified Richter's relation is applied. From the study of applicability it is found that error is less if body wave magnitude is taken in the seismicity study. From the completeness analysis of the datafile it has been found that the datafile is complete from different period onwards for different magnitudes.