March 2013
Temperature dependence of wall-plug efficiency of high power laser diodes
Temperature dependence of wall-plug efficiency of high power laser diodes is theoretically analyzed in terms of experimentally measured parameters of the device. This issue has an influence on the available power output and on the degradation mechanism. High power laser diodes have become increasingly important as the output power of such devices continues to rise. The present calculations revealed that the decrease of...
March 2013
Temperature dependent current-voltage characteristics of electrodeposited p-ZnO/n-Si heterojunction
p-ZnO thin films were grown by electrochemical deposition (ECD) technique on n-Si substrate in order to form the p-ZnO/n-Si heterojunction. Hall measurement and hot probe techniques were used to determine the conductivity type of the ECD grown ZnO thin film. X-ray diffraction measurements revealed the peaks corresponding to the ZnO crystal directions of (002), (101) and (200) confirmed by the Joint...
March 2013
Effect of milling conditions on the formation of ZnFe2O4 nanocrystalline
The effects of milling parameters on the formation of ZnFe2O4 nanocrystalline are studied. Powder mixtures of ZnO and Fe2O3 were milled in high energy vibrant ball milling for different balls to powders mass ratio and milling times. X-ray diffraction and scanning electron microscopy are used to characterize the powders. A crystalline size and lattice parameter are obtained from Scherrer formula and the...
March 2013
Traffic accident in India in relation with solar and geomagnetic activity parameters and cosmic ray intensity (1989 to 2010)
We studied the relation between deaths due to traffic accident in India and geomagnetic activity indices: Kp, Ap, Dst and solar activity (SA) parameters, sun spot number, solar flare index (FI), coronal index (CI) and yearly average of cosmic ray intensity, observed during the period of 1989-2011. It is seen that rate of death by traffic accident are well correlated with these parameters. We have found large negative...
March 2013
A modified surface wave particle motion discrimination process
The difference between polarization properties of surface waves and noise provides us with a simple way of discriminating the fundamental mode surface waves on three-component seismograms. In this process, vertical, radial and transverse component amplitudes at each frequency are weighted according to a theoretical three-dimensional particle motion pattern for a selected window length (WL) and moving interval (MI). For...
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