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Anantapur, India

Jawaharlal Nehru Technological University, Anantapur is a state university in Anantapur, Andhra Pradesh, India. Founded in 1946, it has since 1972 been a constituent college of Jawaharlal Nehru Technological University, as set by The Jawaharlal Nehru Technological University Act, 1972. In 2008 it had received autonomous status by the Jawaharlal Nehru Technological Universities Act, 2008. Wikipedia.


Ramanaiah K.,VR Siddhartha Engineering College | Ratna Prasad A.V.,VR Siddhartha Engineering College | Hema Chandra Reddy K.,Jawaharlal Nehru Technological University Anantapur
Materials and Design | Year: 2013

The objective of present work is to introduce sansevieria natural fiber as reinforcement in the preparation of partially biodegradable green composites. The effect of fiber content on mechanical properties of composite was investigated and found that tensile strength and impact strength at maximum fiber content were 2.55 and 4.2 times to that of pure resin, respectively. Transverse thermal conductivity of unidirectional composites was investigated experimentally by a guarded heat flow meter method. The thermal conductivity of composite decreased with increase in fiber content and the quite opposite trend was observed with respect to temperature. In addition, the experimental results of thermal conductivity at different volume fractions were compared with theoretical model. The response of specific heat capacity of the composite with temperature as measured by differential scanning calorimeter was discussed. Lowest thermal diffusivity of composite was observed at 90°C and its value is 0.9948E-07m2s-1.Fire behavior of composite was studied using the oxygen consumption cone calorimeter technique. The addition of sansevieria fiber has effectively reduced the heat release rate (HRR) and peak heat release rate (PHRR) of the matrix by 10.4%, and 25.7%, respectively. But the composite ignite earlier, release more amount of carbon dioxide yield and total smoke during combustion, when compared to neat polyester resin. © 2013 Elsevier Ltd. Source


Sunitha K.,Indian Institute of Chemical Technology | Satyanarayana S.V.,Jawaharlal Nehru Technological University Anantapur | Sridhar S.,Indian Institute of Chemical Technology
Carbohydrate Polymers | Year: 2012

Dense membranes of chitosan were prepared and ionically crosslinked with phosphoric acid for varying intervals of time. The membranes were characterized by FTIR and XRD to confirm cross-linking. TGA and IEC studies were conducted to assess the thermal stability and estimate the number of interactive groups left in the membrane after crosslinking. Sorption studies were carried out to evaluate the extent of interaction and degree of swelling of the membranes in pure liquids as well as binary mixtures. The phosphorylated chitosan membrane crosslinked for 2 h showed good mechanical strength and strong potential for breaking the azeotrope of 95.58 wt% ethanol by exhibiting a high pervaporation selectivity of 213 with substantial water flux of 0.58 kg/(m2 h). Pervaporation experimental parameters such as feed composition, membrane thickness and permeate pressure were varied to identify optimum operating conditions. © 2011 Elsevier Ltd. All rights reserved. Source


Arora P.K.,University of Hyderabad | Sasikala C.,Jawaharlal Nehru Technological University Anantapur | Ramana C.V.,University of Hyderabad
Applied Microbiology and Biotechnology | Year: 2012

Chlorinated nitroaromatic compounds (CNAs) are persistent environmental pollutants that have been introduced into the environment due to the anthropogenic activities. Bacteria that utilize CNAs as the sole sources of carbon and energy have been isolated from different contaminated and non-contaminated sites. Microbial metabolism of CNAs has been studied, and several metabolic pathways for degradation of CNAs have been proposed. Detoxification and biotransformation of CNAs have also been studied in various fungi, actinomycetes and bacteria. Several physicochemical methods have been used for treatment of wastewater containing CNAs; however, these methods are not suitable for in situ bioremediation. This review describes the current scenario of the degradation of CNAs. © Springer-Verlag 2012. Source


Ravikumar Y.V.L.,Indian Institute of Chemical Technology | Sridhar S.,Indian Institute of Chemical Technology | Satyanarayana S.V.,Jawaharlal Nehru Technological University Anantapur
Separation and Purification Technology | Year: 2013

Recovery of solvents from aqueous industrial effluents containing hazardous compounds is not directly feasible by conventional methods due to the complex nature of such wastewaters. An effluent from a pharmaceutical industry contains 2-3 wt% explosive sodium azide + corrosive ammonium chloride salts, 15-20% dimethylsulfoxide (DMSO) solvent and water. The focus of this work is to establish a hybrid process to facilitate removal of salts by electrodialysis (ED) followed by distillation to recover DMSO. An indigenously constructed ED system of 1.05 m2 membrane area was used to process 10 L batch size. Pure DMSO was recovered from desalted liquor by vacuum distillation in two stages to obtain DMSO concentration up to 60-70% in the first stage and subsequent recovery of pure DMSO in the second. Effect of operating parameters such as flow rate, limiting current density and voltage was evaluated. Distillation was carried out at 20-30 mmHg at reboiler temperature below 150 °C. Drug prepared using the recycled DMSO (>99.5%) was found to meet desired specifications. Detailed design of the ED-distillation process scheme to treat 7500 L/day of the effluent revealed that it was technically and economically feasible, since 30 Metric Tonnes of solvent has been recovered by the industry. © 2013 Elsevier B.V. All rights reserved. Source


Ramanaiah K.,VR Siddhartha Engineering College | Ratna Prasad A.V.,VR Siddhartha Engineering College | Hema Chandra Reddy K.,Jawaharlal Nehru Technological University Anantapur
Materials and Design | Year: 2012

The main focus of this study is to utilize waste grass broom natural fibers as reinforcement and polyester resin as matrix for making partially biodegradable green composites. Thermal conductivity, specific heat capacity and thermal diffusivity of composites were investigated as a function of fiber content and temperature. The waste grass broom fiber has a tensile strength of 297.58MPa, modulus of 18.28GPa, and an effective density of 864kg/m3. The volume fraction of fibers in the composites was varied from 0.163 to 0.358. Thermal conductivity of unidirectional composites was investigated experimentally by a guarded heat flow meter method. The results show that the thermal conductivity of composite decreased with increase in fiber content and the quite opposite trend was observed with respect to temperature. Moreover, the experimental results of thermal conductivity at different volume fractions were compared with two theoretical models. The specific heat capacity of the composite as measured by differential scanning calorimeter showed similar trend as that of the thermal conductivity. The variation in thermal diffusivity with respect to volume fraction of fiber and temperature was not so significant. The tensile strength and tensile modulus of the composites showed a maximum improvement of 222% and 173%, respectively over pure matrix. The work of fracture of the composites with maximum volume fraction of fibers was found to be 296Jm-1. © 2012 Elsevier Ltd. Source

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