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Rai C.,Mangalore University | Rai C.,Kalpataru First Grade Science College | Sreenivas K.,University of Delhi | Dharmaprakash S.M.,Mangalore University
Journal of Crystal Growth | Year: 2010

Single crystals of Iminodiacetic acid (HN(CH 2COOH) 2) doped Triglycine sulphate (IDATGS) has been grown from aqueous solution at constant temperature by slow evaporation technique. The concentration of the dopant in the TGS solution was 2 mol%. The X-ray diffraction analysis indicates that there is significant change in the lattice parameters compared to pure TGS crystal. The IDATGS crystal has larger transition temperature and observed higher and uniform figure of merit over most part of the ferroelectric phase. These crystals also exhibit higher internal bias field and micro-hardness number compared to pure TGS. Therefore IDATGS may be a potential material for IR detectors. © 2009 Elsevier B.V. All rights reserved.

Shivanna A.M.,Kalpataru First Grade Science College | Vijayabhaskar C.,Sri Siddartha First Grade College | Nagendrappa G.,University of Mysore
Nature Environment and Pollution Technology | Year: 2012

Physico-chemical properties of six selected tank waters of Tiptur taluk were examined for the suitability of water for irrigation purpose through pH, EC, CO3 -2, HCO3 -, Cl-, SO4 -2, PO4 -3, Na+, K+, Ca+2, Mg+2 and boron. The assessment of the samples was made in terms of salinity problem, sodium hazard, permeability (infiltration) problem and toxicity problem through the parameters EC, SAR, RSC, RSBC, % Na, chloride and boron content of water. These values were compared with the guidelines set by Ayers and Westcot, Eaton andWilcox. Results of analysis showed that water of Vaddaramallenahalli tank has EC<0.2dSm -1and SAR 0-3meq/L and was not ideal for irrigation. Waters of the remaining five tanks, i.e., Eachanoor tank, Karadi tank, Halkurke tank, Honnavalli tank andAlbur tank were falling intomoderate class. No sample in the study area was ideal for irrigation.

Shivanna A.M.,Kalpataru First Grade Science College | Nagendrappa G.,University of Mysore
Nature Environment and Pollution Technology | Year: 2015

Analysis of water quality of five tank water samples in Tiptur taluk through 18 physico-chemical parameters, namely WT, pH, DO, BOD, EC, TDS, TA, TH, CO3 2-, HCO3 -, Cl-, SO4 2-, PO4 3-, NO3 -, Na+, K+, Ca2+ and Mg2+ was taken up during December 2010 to November 2012. A systematic calculation of correlation coefficient among these 18 physico-chemical parameters was carried out using Microsoft excel spreadsheet. A correlation coefficient of 1.00 was found between the TA-HCO3-pair in Eachanur and V. Mallenahalli samples and the pair is perfectly correlated, whereas, 'r' value was 0.99 in Halkurke and Honnavalli samples and 0.97 in Albur samples. EC and TDS were perfectly correlated in Halkurke samples and for the same pair 'r' value was 0.99 in Eachanur, V. Mallenahalli and Honnavalli samples, whereas it was 0.85 in Albur samples. BOD and PO4 3-were perfectly correlated in Eachanur samples. When r > ± 0.5 was considered, a total of 22 positive and 3 negative correlations in Eachanur samples; 18 positive and 9 negative correlations in V. Mallenahalli samples; 31 positive and 2 negative correlations in Halkurke samples; 36 positive and 6 negative correlations in Honnavalli samples; and 18 positive and 5 negative correlations in Albur samples were found during the analysis. For a better interpretation of the results, the coefficient of determination was used in addition to 'r' value.

Shivanna A.M.,Kalpataru First Grade Science College | Nagendrappa G.,University of Mysore
Nature Environment and Pollution Technology | Year: 2012

Considering the impacts of agricultural runoff, domestic sewage and other anthropogenic activities on the quality of surface water, a physico-chemical study regarding water quality assessment of Halkurke tank and Honnavalli tank water samples belonging to Tiptur Tahsil was carried out for one year to know the seasonal variation and to assess water quality. In the present study, physico-chemical parameters such as temperature, pH, EC, TDS, TH, alkalinity, carbonate, bicarbonate, chloride, sulphate, phosphate, sodium, potassium, calcium, magnesium and boron were estimated. To check the suitability of water for irrigation SAR, % Na, RSC and RSBC parameters were evaluated. The results revealed that the physico-chemical parameters were within the range prescribed by BIS for drinking purposes, but they were on the higher side. The values of pH were on mild alkaline side due to higher alkalinity. Higher values of SAR (5.68 and 4.19), EC (704 and 732.25μmhos/cm), RSC (4.3 and 2.81 meq/L) and Na% (72.38 and 62.71) pose salinity and permeability problems to soils and put the said water samples under medium quality for irrigation purposes. Since these tanks are the only sources to recharge the underground water of the area, groundwater quality of these regions will also be gradually affected.

Rai C.,Mangalore University | Rai C.,Kalpataru First Grade Science College | Sanjeev G.,Mangalore University | Dharmaprakash S.M.,Mangalore University
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2010

Single crystal of iminodiacetic acid (5 mol%) doped Tri Glycine Sulphate (IDATGS) was grown by slow evaporation from its aqueous solution at constant temperature, using solution growth method. The dielectric constant (′) and pyroelectric current (IP) were measured over the temperature range of 30-60 °C in the ferroelectric direction. The measured values of ′ and IP were found to be smaller compared to pure triglycine sulphate (TGS) crystal parameters. But increased transition temperature was observed for doped crystals. Curie Weiss constants CP and Cf in the paraelectric and ferroelectric phases were also determined. The doped crystal was irradiated with graded dosages from 5 to 80 kGy of electron beam from 8 MeV Microtron at room temperature and radiation effects on optical and dielectric properties were studied. The UV-Vis absorption spectrum indicates that the UV lower cutoff shifts towards the higher wavelength region (red shift) and the optical band gap is found to be decreasing with the increase of electron dose. It is also observed that the electron irradiation effects in pure and doped TGS were found to be long lasting. The dielectric study shows that there is a gradual reduction in dielectric constant at TC and shifting of Curie temperature towards lower temperature region with the increase in electron radiation dose. The material figures of merit were found increased after the crystal was irradiated. Induced changes in the physical and optical properties due to irradiation may help one to tailor the device quality and characteristics. © 2010 Elsevier B.V. All rights reserved.

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