ABSTRACT:The study was conducted to findout the physico-chemical and bacteriological characteristics of Noyyal River and ground water quality of Perur, India. The river water and ground water (bore well and open well) samples were collected in and around Perur and analyzed for various physico-chemical and bacteriological parameters. The study indicated that the mean value of studied parameters, except phosphate, biological oxygen demand (BOD), chemical oxygen demand (COD) of the river water and ground water samples were within the permissible limit. The parameters include total suspended solids (TSS-132.2 mgl -1 ), BOD (9.55 mgl -1

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Thin films of manganese-doped cadmium oxide (CdO:Mn) with different Mn-doping levels (0, 1, 2, 3 and 4 at.%) were deposited on glass substrates by employing an inexpensive, simplified spray technique using a perfume atomizer at 375°C. The influence of Mn incorporation on the structural, morphological, optical and electrical properties of CdO films has been studied. All the films exhibit cubic crystal structure with a (1 1 1) preferential orientation. Mn-doping causes a slight shift of the (1 1 1) diffraction peak towards higher angle. The crystallite size of the films is found to decrease from 34.63 nm to 17.68 nm with an increase in Mn doping concentration. The CdO:Mn film coated with 1 at.% Mn exhibit a high transparency of nearly 90 % which decreases for higher doping concentration. The optical band gap decreases with an increase in Mn doping concentration. All the films have electrical resistivity of the order of 10 −4 Ω·cm.

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