Nāgpur, India
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Suryawanshi H.M.,South Ambazari Road | Patil U.V.,South Ambazari Road | Renge M.M.,Visvesvaraya National Institute of Technology
EPE Journal (European Power Electronics and Drives Journal) | Year: 2013

Modified combined direct torque control (DTC) and field oriented control (FOC) based method is proposed in this paper to improve the performance of induction motor (IM) drive. The proposed method includes combined advantages of DTC and FOC schemes. An algorithm is developed for closed-loop control of the proposed control method and the scheme is implemented in space vector controlled five-level diode-clamped inverter. For this, an experimental prototype is developed to control three-phase, 3-hp IM drive. The comparative performance of proposed control method, DTC and FOC with experimental results in SVM controlled five-level inverter is presented to validate the effectiveness of the proposed control scheme. Also, the switching states are selected so as to control the inverter output voltage as well as reduce the common mode voltage (CMV) of the drive.

Deokar S.K.,South Ambazari Road | Bajad G.S.,South Ambazari Road | Bhonde P.,South Ambazari Road | Vijayakumar R.P.,South Ambazari Road | Mandavgane S.A.,South Ambazari Road
Journal of Polymers and the Environment | Year: 2016

In this study, carbon nanotubes (CNTs) were synthesized from waste polyethylene bottles and their use as an adsorbent for the removal of diuron herbicide from aqueous solution was evaluated. Batch adsorption was performed by varying adsorbent dosage, initial concentration, contact time, and temperature. Kinetic models applied to experimental data indicated that the pseudo-second-order model had the best fit. The equilibrium data were analyzed using different isotherm models. The adsorption capacity of CNTs for diuron removal, determined using the Hill isotherm, was approximately 40.37 mg/g at 303 K. From thermodynamic studies, the values of ΔH° (kJ/mol) and ΔS° [kJ/(mol K)] were calculated as −17.307 and −0.0528, respectively, which suggested that the adsorption process was exothermic. The negative values of ΔG° at three different temperatures indicated that adsorption of diuron on CNTs was favorable. © 2016 Springer Science+Business Media New York

Trivedi N.S.,South Ambazari Road | Mandavgane S.A.,South Ambazari Road | Kulkarni B.D.,CSIR - National Chemical Laboratory
Environmental Science and Pollution Research | Year: 2016

The work highlights the utilization of an agricultural waste mustard plant ash (MPA) as a soil additive and an adsorbent. MPA was characterized by X-ray fluorescence (XRF), energy-dispersive X-ray spectroscopy (EDX), proximate analysis, CHNS analysis, Brunauer–Emmett–Teller (BET) surface area analysis, zeta potential measurements, Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). XRF analysis confirmed the presence of CaO (31.35 %), K2O (18.55 %), and P2O5 (6.99 %), all of which act as micronutrients to plants. EDX also confirms high amount of elemental O, Ca, K, and P. The adsorptive ability of MPA was investigated using a commonly used herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), as a representative chemical. Batch adsorption experiments were conducted to study the effect of different operational parameters such as adsorbent dose, initial 2,4-D concentration, contact time, and temperature on the adsorption process. Data from experiments were fitted to various kinetic and isothermal models. The pseudo-second-order kinetic model was found to show the best fit (R2 > 0.99), with the highest k2 value of the order 105. Based on the study results, dosage of MPA/hectare for different crops has been recommended for effective removal of 2,4-D. To our knowledge, this is the first study in which MPA has been characterized in detail and investigated for dual applications (as an adsorbent and as a soil additive). © 2016 Springer-Verlag Berlin Heidelberg

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