Kuvempu University

About: Kuvempu University is a education organization based out in Shimoga, India. It is known for research contribution in the topics: Cyclic voltammetry & Carbon paste electrode. The organization has 1575 authors who have published 2210 publications receiving 39755 citations. The organization is also known as: KU.

Bioconvection of a Radiating Hybrid Nanofluid Past a Thin Needle in the Presence of Heterogeneous–Homogeneous Chemical Reaction

Abstract: The photocatalytic nature of TiO2 finds applications in medicinal field to kill cancer cells, bacteria, and viruses under mild ultraviolet illumination and the antibacterial characteristic of Ag makes the composition Ag−TiO2 applicable for various purposes. It can also be used in other engineering appliances and industries such as humidity sensor, coolants, and in footwear industry. Hence, this study deals with the analysis of the effects of magnetic field, thermal radiation, and quartic autocatalysis of heterogeneous–homogeneous reaction in an electrically conducting Ag−TiO2−H2O hybrid nanofluid. Furthermore, the gyrotactic microorganisms are used as active mixers to prevent agglomeration and sedimentation of TiO2 that occurs due to its hydrophobic nature. The mathematical model takes the form of partial differential equations with viscosity and thermal conductivity being the functions of volume fraction. These equations are converted to ordinary differential equations by using similarity transformation and are solved by RKF-45 method with the aid of shooting method. It is observed that the increase in the size of the needle enhances the overall performance of the hybrid nanofluid. Furthermore, the temperature of the hybrid nanofluid increases with the increase in volume fraction. It is observed that the friction produced by the Lorentz force increases the temperature of the nanofluid. It is further observed that the heterogeneous reaction parameter has more significant effect on the concentration of bulk fluid than the homogeneous reaction parameter.

Rainfall-runoff modelling of Doddahalla watershed—an application of HEC-HMS and SCN-CN in ungauged agricultural watershed

Abstract: The scarcity of reliable rainfall-runoff recorded data in Doddahalla watershed is a serious problem for the analysis of the hydrology of watersheds. Sustainable management of the available water in this area is only possible when there was sound information on the rainfall-runoff and other hydrological determinants that influence the water resource. Considering the current problem rainfall-runoff. simulation is carried out using the HEC-HMS hydrological simulation model with integrated use of remote sensing and GIS. Tropical Rainfall Measuring Mission 3 hourly and Indian Meteorological Department daily rainfall datasets are utilised. Cartosat-1 CartoDEM (30 m) was used to delineate the sub-watershed and generate the stream network. Geospatial Hydrologic Modeling Extension (HEC-GeoHMS), along with ArcHydro extension in ArcGIS 9.3 utilised to create the input file for use in HEC-HMS. Indian Remote Sensing Satellite Linear Imaging and Self Scanning sensors (LISS-III, 24 m) and Survey of India (SOI) toposheet are used to prepare the soil and land use map. All the data are georectified and reprojected to Geographic Coordinate System-World Geodetic System 1984 (GCS WGS) Universal Transverse Mercator (UTM) zone 43 North for the easy handling in GIS environment. SCS-CN loss model and SCS unit hydrograph as a transform method was applied to simulate the excess storm water to direct runoff in the watershed. The Muskingum-Cunge model used as channel routing. The model is validated by using field observation data and discharge data from the neighbouring Hoovinahole watershed. The results of simulated and observed stream flow show greater confidence and the reliability of the model. Similar procedure and calibration parameters applied to the ungauged Doddahalla watershed for estimating the rainfall-runoff. The research result gives a general idea regarding the stream flow, peak flow and velocity of the peak flow. The present study concludes that the stimulated result can be useful for the water and land resource planning and management practice in the Doddahalla watershed. The models can be best utilised in ungauged watershed and water scarce region where the monitored data are limited, and runoff estimation is mandatory to sustain the water resources.

Hepatoprotective activity of Indian Phyllanthus

Abstract: Context: Phyllanthus (Euphorbiaceae) species are traditionally well-known for their medicinal properties including hepatoprotective activity.Objective: The study assessed the hepatoprotective and antioxidant activities of 11 Phyllanthus species, P. amarus Schumach., P. urinaria L., P. debilis Klein ex Willd, P. tenellus Roxb., P. virgatus G. Forst., P. maderaspatensis L., P. reticulatus Poir., P. polyphyllus Willd., P. emblica L., P. indofischerii Bennet. and P. acidus (L.) Skeels.Materials and methods: The dried leaves and stems of each plant species were extracted in methanol and successively in water. The extracts were screened for hepatoprotective activity at a concentration of 50 µg/mL against tert-butyl hydroperoxide (t-BH) induced toxicity in HepG2 cells. Seven extracts from five species that showed hepatoprotective activity were assessed for their 50% effective concentration (EC50) values and their antioxidant activity using a DPPH assay. Phyllanthin and hypophyllanthin contents were also determin...