Undoped and Co 2+ doped FeS 2 thin films (Co compositions are 1 to 5 mole%) were deposited on indium tin oxide glass substrate by a single step electrochemical deposition (ECD) method at low temperature (70 • C). Glancing angle X-ray diffraction (GAXRD) and Raman spectra showed that as-deposited undoped and Co 2+ doped FeS 2 thin films have a cubic pyrite structure without any trace of orthorhombic marcasite phase. Co 2+ doping does not affect the cubic structure of FeS 2 thin films with a strong (111) plane preferred orientation in all the doped thin films. The height profiling of 3 mole% of Co 2+ doped FeS 2 thin film by atomic force microscopy revealed a smooth surface with uniform distribution of particles and low roughness values. Co 2+ (3, 4 and 5 mole%) doped thin films show a strong absorption peak in the higher wavelength region. Magnetic measurement reveals that Co 2+ doping into the FeS 2 lattice induces ferromagnetism. The Co 2+ in FeS 2 thin films acts as the acceptor and the original p-type conductivity is retained. Solar light irradiation with the intensity of 100 mW/cm 2 on Co 2+ (3 mole%) doped FeS 2 thin film cell resulted in a power conversion efficiency of 5.42%.

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In this paper an algorithm has been proposed to detect and classify the cardiac arrhythmia from a normal Electro Cardio Graphic (ECG) signal based on wavelet decomposition with adaptive threshold. The MIT -BIH arrhythmia and malignant ventricular arrhythmia database has been utilized for evaluating the algorithm. The performance of the algorithm is compared with some existing algorithms in terms of signal duration time (episode length), sensitivity, specificity and positive selectivity. The analysis shows that the proposed algorithm gives satisfactory results.