Ramchandra Dalvi - Academia.edu (original) (raw)
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Papers by Ramchandra Dalvi
Desalination, 2017
Thin film composite membranes (TFC) consisting of an ultra-thin polyamide layer made from interfa... more Thin film composite membranes (TFC) consisting of an ultra-thin polyamide layer made from interfacial polymerization remain to be of paramount importance for seawater desalination. Incorporation of nanoparticles into the polyamide layer has produced thin film nanocomposite (TFN) membranes with better performance than traditional TFC membranes. However, challenges of defect formation with the introduction of nanoparticles need careful adjustments in order to surpass the trade-off relationship between permeability and selectivity. Here, we explored the influential effects of nanoparticles, solvent and surfactant treatments on the desalination performance of TFN membranes under 55 bar using 35,000 ppm NaCl as the feed at 25°C. TFN membranes with various loadings of polyhedral oligomeric silsesquioxane (POSS) and TiO 2-SiO 2 core-shell nanoparticles were fabricated. Surfactant treatment was performed in two different ways: membrane soaking and in-tank addition. Unexpectedly, the latter endows the membrane with an improved rejection without sacrificing its flux possibly due to the formation of a surfactant monolayer to heal defects in TFN membranes. The newly developed TFN-T membrane with the aid of synergic effects from nanoparticles, ethanol and surfactant post-treatments shows comparable performance to most commercial membranes. This work may provide useful insights to overcome the trade-off relationship between permeability and selectivity of TFN membranes for seawater desalination.
2020 International Conference on System, Computation, Automation and Networking (ICSCAN), 2020
This paper talks about the effect of distortion on speech or audio signal and aims to prove using... more This paper talks about the effect of distortion on speech or audio signal and aims to prove using a MATLAB simulation, why human ear is not perceptive to phase distortion. A bandpass filter designed is also implemented to filter out undesirable frequencies which may be present along with the input signal. This was carried out in software and hardware. The inspiration is drawn from various research papers and articles online and it is very intriguing to work with All pass filters given the wide scale real-life applications of All pass filters in places where one could never even imagine for them to be present.
Desalination, 2017
Thin film composite membranes (TFC) consisting of an ultra-thin polyamide layer made from interfa... more Thin film composite membranes (TFC) consisting of an ultra-thin polyamide layer made from interfacial polymerization remain to be of paramount importance for seawater desalination. Incorporation of nanoparticles into the polyamide layer has produced thin film nanocomposite (TFN) membranes with better performance than traditional TFC membranes. However, challenges of defect formation with the introduction of nanoparticles need careful adjustments in order to surpass the trade-off relationship between permeability and selectivity. Here, we explored the influential effects of nanoparticles, solvent and surfactant treatments on the desalination performance of TFN membranes under 55 bar using 35,000 ppm NaCl as the feed at 25°C. TFN membranes with various loadings of polyhedral oligomeric silsesquioxane (POSS) and TiO 2-SiO 2 core-shell nanoparticles were fabricated. Surfactant treatment was performed in two different ways: membrane soaking and in-tank addition. Unexpectedly, the latter endows the membrane with an improved rejection without sacrificing its flux possibly due to the formation of a surfactant monolayer to heal defects in TFN membranes. The newly developed TFN-T membrane with the aid of synergic effects from nanoparticles, ethanol and surfactant post-treatments shows comparable performance to most commercial membranes. This work may provide useful insights to overcome the trade-off relationship between permeability and selectivity of TFN membranes for seawater desalination.
2020 International Conference on System, Computation, Automation and Networking (ICSCAN), 2020
This paper talks about the effect of distortion on speech or audio signal and aims to prove using... more This paper talks about the effect of distortion on speech or audio signal and aims to prove using a MATLAB simulation, why human ear is not perceptive to phase distortion. A bandpass filter designed is also implemented to filter out undesirable frequencies which may be present along with the input signal. This was carried out in software and hardware. The inspiration is drawn from various research papers and articles online and it is very intriguing to work with All pass filters given the wide scale real-life applications of All pass filters in places where one could never even imagine for them to be present.