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Papers by panneer selvam

Research paper thumbnail of Groundwater Investigation Using Geoelectrical Method: A Case Study of the Western Region of Cameroon

Journal of Water Resource and Protection, 2013

A geoelectrical survey using the electrical resistivity method was carried out in some villages i... more A geoelectrical survey using the electrical resistivity method was carried out in some villages in the western region of Cameroon to investigate the sub-surface layers and evaluate the characteristics of aquifers. The direct current electrical resistivity method was utilized for the present study. Applying the Schlumberger array, a total of twenty four (24) Vertical Electrical Soundings (VES) were conducted. Quantitative and qualitative interpretations of data were carried out to determine the nature and thickness of the aquifer zone combined with existing litho-logs aided correlation of geoelectric sections to litho-logs. Four to five geoelectric layers were delineated from the survey area. The first layer which is the topsoil has resistivity values ranging from 6-949 Ωm and the thickness is between 0.2-4.2 m. The second layer which is made up of clay and laterite has resistivity values ranging between 9-1862 Ωm and thickness range from 1.0-16.4 m. The third and fourth geoelectric layers are made up of clay and granite/basalts with thickness varying from 2.2-39.5 m which corresponds to an aquifer horizon. Resistivity values of the aquifer ranges from 10 to 70,506 Ωm. The resistivity map drawn from these measurements shows the presence of a low resistivity zone which indicates the reflection in the direction of ground water from northeast to southwest with the recharge concentrated to the south of the study area. This study has revealed for this area, an average depth of the aquifer of 32 m with the average thickness of the aquifer being 22 m. The geoelectric sections of some VES stations demarcated corroborate very well with the geological description of the area.

Research paper thumbnail of Hydrochemical characteristics and GIS-based assessment of groundwater quality in the coastal aquifers of Tuticorin corporation, Tamilnadu, India

Applied Water Science, 2012

Tuticorin corporation stretches geographically from 8°43 0-8°51 0 N latitude and 78°5 0-78°10 0 E... more Tuticorin corporation stretches geographically from 8°43 0-8°51 0 N latitude and 78°5 0-78°10 0 E longitude, positioned in the East-West International sea routes on the SouthEast coast of India. The rapid urban developments in the past two decades of Tuticorin have caused depletion of groundwater quantity, and deterioration of quality through excessive consumption and influx of pollutants from natural and anthropogenic activities. The water samples collected in the field were analyzed for electrical conductivity, pH, total dissolved solids, major cations like calcium, magnesium, sodium, potassium, and anions SUCH AS bicarbonate, carbonate, chloride, nitrate and sulfate, in the laboratory using the standard methods given by the American Public Health Association. In order to assess the groundwater quality, 36 groundwater samples had been collected in year 2011. The geographic information system-based spatial distribution map of different major elements has been prepared using ArcGIS 9.2. The Piper plot shows that most of the groundwater samples fall in the field of Ca 2?-Mg 2?-Cl-SO 4 2and Na ?-K ?-Cl-HCO 3 by projecting the position on the plots in the triangular field. The cation concentration indicate that 83, 39 and 22 % of the K ? , Na ? , Ca 2? concentrations exceed the WHO limit. As per Wilcox's diagram and US Salinity laboratory classification, most of the groundwater samples are not suitable for irrigation due to the presence of high salinity and medium sodium hazard. Irrigation waters classified based on sodium absorption ratio, have revealed that 52 % groundwater are in general safe for irrigation, which needs treatment before use. permeability index also indicates that the groundwater samples are suitable for irrigation purpose.

Research paper thumbnail of Experimental Investigation of Machining Parameters on Surface Roughness in Dry and Wet Wire-Electrical Discharge Machining

Advanced Materials Research, 2011

Wire electrical discharge machining (WEDM) is a thermal process in which the workpiece and the wi... more Wire electrical discharge machining (WEDM) is a thermal process in which the workpiece and the wire (tool) experience an intense local heating in the discharge channel. The high power density results in the erosion of a part of the material from both electrodes by local melting and vaporization. Whilst good surface finish and high material removal rate of the workpiece is a major requirement, the effect of EDM machining factors on these requirements cannot be overlooked. This study investigate the effect of two different machining methods of dry and wet WEDM process as well as the effect of on-time and voltage on the surface roughness of the workpiece. The machining factors used for this study are the pulse current, on-time and voltage. The results of the effect of the two machining methods on the responses are investigated and reported in this paper.

Research paper thumbnail of Groundwater Investigation Using Geoelectrical Survey: A Case Study from Kanukunta Village, Andhra Pradesh, India

A geoelectrical survey using the electrical resistivity method was carried out in some villages i... more A geoelectrical survey using the electrical resistivity method was carried out in some villages in the western region of Cameroon to investigate the sub-surface layers and evaluate the characteristics of aquifers. The direct current electrical resistivity method was utilized for the present study. Applying the Schlumberger array, a total of twenty four (24) Vertical Electrical Soundings (VES) were conducted. Quantitative and qualitative interpretations of data were carried out to determine the nature and thickness of the aquifer zone combined with existing litho-logs aided correlation of geoelectric sections to litho-logs. Four to five geoelectric layers were delineated from the survey area. The first layer which is the topsoil has resistivity values ranging from 6-949 Ωm and the thickness is between 0.2-4.2 m. The second layer which is made up of clay and laterite has resistivity values ranging between 9-1862 Ωm and thickness range from 1.0-16.4 m. The third and fourth geoelectric layers are made up of clay and granite/basalts with thickness varying from 2.2-39.5 m which corresponds to an aquifer horizon. Resistivity values of the aquifer ranges from 10 to 70,506 Ωm. The resistivity map drawn from these measurements shows the presence of a low resistivity zone which indicates the reflection in the direction of ground water from northeast to southwest with the recharge concentrated to the south of the study area. This study has revealed for this area, an average depth of the aquifer of 32 m with the average thickness of the aquifer being 22 m. The geoelectric sections of some VES stations demarcated corroborate very well with the geological description of the area.

Research paper thumbnail of Groundwater Investigation Using Geoelectrical Method: A Case Study of the Western Region of Cameroon

Journal of Water Resource and Protection, 2013

A geoelectrical survey using the electrical resistivity method was carried out in some villages i... more A geoelectrical survey using the electrical resistivity method was carried out in some villages in the western region of Cameroon to investigate the sub-surface layers and evaluate the characteristics of aquifers. The direct current electrical resistivity method was utilized for the present study. Applying the Schlumberger array, a total of twenty four (24) Vertical Electrical Soundings (VES) were conducted. Quantitative and qualitative interpretations of data were carried out to determine the nature and thickness of the aquifer zone combined with existing litho-logs aided correlation of geoelectric sections to litho-logs. Four to five geoelectric layers were delineated from the survey area. The first layer which is the topsoil has resistivity values ranging from 6-949 Ωm and the thickness is between 0.2-4.2 m. The second layer which is made up of clay and laterite has resistivity values ranging between 9-1862 Ωm and thickness range from 1.0-16.4 m. The third and fourth geoelectric layers are made up of clay and granite/basalts with thickness varying from 2.2-39.5 m which corresponds to an aquifer horizon. Resistivity values of the aquifer ranges from 10 to 70,506 Ωm. The resistivity map drawn from these measurements shows the presence of a low resistivity zone which indicates the reflection in the direction of ground water from northeast to southwest with the recharge concentrated to the south of the study area. This study has revealed for this area, an average depth of the aquifer of 32 m with the average thickness of the aquifer being 22 m. The geoelectric sections of some VES stations demarcated corroborate very well with the geological description of the area.

Research paper thumbnail of Hydrochemical characteristics and GIS-based assessment of groundwater quality in the coastal aquifers of Tuticorin corporation, Tamilnadu, India

Applied Water Science, 2012

Tuticorin corporation stretches geographically from 8°43 0-8°51 0 N latitude and 78°5 0-78°10 0 E... more Tuticorin corporation stretches geographically from 8°43 0-8°51 0 N latitude and 78°5 0-78°10 0 E longitude, positioned in the East-West International sea routes on the SouthEast coast of India. The rapid urban developments in the past two decades of Tuticorin have caused depletion of groundwater quantity, and deterioration of quality through excessive consumption and influx of pollutants from natural and anthropogenic activities. The water samples collected in the field were analyzed for electrical conductivity, pH, total dissolved solids, major cations like calcium, magnesium, sodium, potassium, and anions SUCH AS bicarbonate, carbonate, chloride, nitrate and sulfate, in the laboratory using the standard methods given by the American Public Health Association. In order to assess the groundwater quality, 36 groundwater samples had been collected in year 2011. The geographic information system-based spatial distribution map of different major elements has been prepared using ArcGIS 9.2. The Piper plot shows that most of the groundwater samples fall in the field of Ca 2?-Mg 2?-Cl-SO 4 2and Na ?-K ?-Cl-HCO 3 by projecting the position on the plots in the triangular field. The cation concentration indicate that 83, 39 and 22 % of the K ? , Na ? , Ca 2? concentrations exceed the WHO limit. As per Wilcox's diagram and US Salinity laboratory classification, most of the groundwater samples are not suitable for irrigation due to the presence of high salinity and medium sodium hazard. Irrigation waters classified based on sodium absorption ratio, have revealed that 52 % groundwater are in general safe for irrigation, which needs treatment before use. permeability index also indicates that the groundwater samples are suitable for irrigation purpose.

Research paper thumbnail of Experimental Investigation of Machining Parameters on Surface Roughness in Dry and Wet Wire-Electrical Discharge Machining

Advanced Materials Research, 2011

Wire electrical discharge machining (WEDM) is a thermal process in which the workpiece and the wi... more Wire electrical discharge machining (WEDM) is a thermal process in which the workpiece and the wire (tool) experience an intense local heating in the discharge channel. The high power density results in the erosion of a part of the material from both electrodes by local melting and vaporization. Whilst good surface finish and high material removal rate of the workpiece is a major requirement, the effect of EDM machining factors on these requirements cannot be overlooked. This study investigate the effect of two different machining methods of dry and wet WEDM process as well as the effect of on-time and voltage on the surface roughness of the workpiece. The machining factors used for this study are the pulse current, on-time and voltage. The results of the effect of the two machining methods on the responses are investigated and reported in this paper.

Research paper thumbnail of Groundwater Investigation Using Geoelectrical Survey: A Case Study from Kanukunta Village, Andhra Pradesh, India

A geoelectrical survey using the electrical resistivity method was carried out in some villages i... more A geoelectrical survey using the electrical resistivity method was carried out in some villages in the western region of Cameroon to investigate the sub-surface layers and evaluate the characteristics of aquifers. The direct current electrical resistivity method was utilized for the present study. Applying the Schlumberger array, a total of twenty four (24) Vertical Electrical Soundings (VES) were conducted. Quantitative and qualitative interpretations of data were carried out to determine the nature and thickness of the aquifer zone combined with existing litho-logs aided correlation of geoelectric sections to litho-logs. Four to five geoelectric layers were delineated from the survey area. The first layer which is the topsoil has resistivity values ranging from 6-949 Ωm and the thickness is between 0.2-4.2 m. The second layer which is made up of clay and laterite has resistivity values ranging between 9-1862 Ωm and thickness range from 1.0-16.4 m. The third and fourth geoelectric layers are made up of clay and granite/basalts with thickness varying from 2.2-39.5 m which corresponds to an aquifer horizon. Resistivity values of the aquifer ranges from 10 to 70,506 Ωm. The resistivity map drawn from these measurements shows the presence of a low resistivity zone which indicates the reflection in the direction of ground water from northeast to southwest with the recharge concentrated to the south of the study area. This study has revealed for this area, an average depth of the aquifer of 32 m with the average thickness of the aquifer being 22 m. The geoelectric sections of some VES stations demarcated corroborate very well with the geological description of the area.