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Search Results: 1 - 10 of 305163 matches for " Bharathi Bai J. Basu "
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Improving the Hydrophobicity of ZnO by PTFE Incorporation
Meenu Srivastava,Bharathi Bai J. Basu,K. S. Rajam
Journal of Nanotechnology , 2011, DOI: 10.1155/2011/392754
Abstract: The objective of the present study is to obtain a zinc oxide- (ZnO-) based superhydrophobic surface in a simple and cost-effective manner. Chemical immersion deposition being simple and economical has been adopted to develop modified ZnO coating on glass substrate. Several modifications of ZnO like treatment with alkanoic acid (stearic acid) and fluoroalkylsilane to tune the surface wettability (hydrophobicity) were attempted. The effect of thermal treatment on the hydrophobic performance was also studied. It was observed that thermal treatment at 70°C for 16?hrs followed by immersion in stearic acid resulted in high water contact angle (WCA), that is, a superhydrophobic surface. Thus, a modified ZnO superhydrophobic surface involves the consumption of large amount of electrical energy and time. Hence, the alternate involved the incorporation of low surface energy fluoropolymer polytetrafluoroethylene (PTFE) in the ZnO coating. The immersion deposited ZnO-PTFE composite coating on modification with either stearic acid or fluoroalkylsilane resulted in a better superhydrophobic surface. The coatings were characterized using Scanning Electron Microscope (SEM) for the surface morphology. It was found that microstructure of the coating was influenced by the additives employed. A flower-like morphology comprising of needle-like structure arranged in a radial manner was exhibited by the superhydrophobic coating. 1. Introduction Superhydrophobic surfaces (water contact angle >150°) are gaining importance in industrial applications and academia due to their unique properties like self-cleaning, deicing, antisticking, and anticontamination. Some of the applications include self-cleaning paints, transparent antireflective coatings, self-cleaning glass, and wiperless windshields. In recent times, their usage in aerospace sector is also being explored, particularly in the tail and wings of the aircraft to reduce drag and thereby improve the efficiency of the engine. Superhydrophobicity can be achieved by obtaining a surface of micro- to nanoscale architecture [1]. Empirical models have been proposed on the basis of experimental data to explain the surface wetting properties and to understand the phenomenon of superhydrophobicity. Interest in this phenomenon increased in 1997 when the origin and the universal principle of “Lotus Effect” in nature were explained by Zhang et al. [1]. Since then, research has been focused on mimicking nature and trying to fabricate such surfaces artificially. Various methods have been recommended for the fabrication of such a surface.
Green Inhibitors for Corrosion Protection of Metals and Alloys: An Overview
B. E. Amitha Rani,Bharathi Bai J. Basu
International Journal of Corrosion , 2012, DOI: 10.1155/2012/380217
Abstract: Corrosion control of metals is of technical, economical, environmental, and aesthetical importance. The use of inhibitors is one of the best options of protecting metals and alloys against corrosion. The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion inhibitors as they are biodegradable, do not contain heavy metals or other toxic compounds. As in addition to being environmentally friendly and ecologically acceptable, plant products are inexpensive, readily available and renewable. Investigations of corrosion inhibiting abilities of tannins, alkaloids, organic,amino acids, and organic dyes of plant origin are of interest. In recent years, sol-gel coatings doped with inhibitors show real promise. Although substantial research has been devoted to corrosion inhibition by plant extracts, reports on the detailed mechanisms of the adsorption process and identification of the active ingredient are still scarce. Development of computational modeling backed by wet experimental results would help to fill this void and help understand the mechanism of inhibitor action, their adsorption patterns, the inhibitor-metal surface interface and aid the development of designer inhibitors with an understanding of the time required for the release of self-healing inhibitors. The present paper consciously restricts itself mainly to plant materials as green corrosion inhibitors. 1. Introduction Corrosion is the deterioration of metal by chemical attack or reaction with its environment. It is a constant and continuous problem, often difficult to eliminate completely. Prevention would be more practical and achievable than complete elimination. Corrosion processes develop fast after disruption of the protective barrier and are accompanied by a number of reactions that change the composition and properties of both the metal surface and the local environment, for example, formation of oxides, diffusion of metal cations into the coating matrix, local pH changes, and electrochemical potential. The study of corrosion of mild steel and iron is a matter of tremendous theoretical and practical concern and as such has received a considerable amount of interest. Acid solutions, widely used in industrial acid cleaning, acid descaling, acid pickling, and oil well acidizing, require the use of corrosion inhibitors in order to restrain their corrosion attack on metallic materials. 2. Corrosion Inhibitors Over the years, considerable efforts have been deployed to find suitable corrosion inhibitors of organic origin in various corrosive media
Ultra-Rapid Opioid Detoxification: Current Status and Controversies
Singh J,Basu Debasish
Journal of Postgraduate Medicine , 2004,
Abstract: Opioid dependence is a major health problem and a cause of increasing concern to physicians and other health professionals worldwide. A crucial first step in intervention is detoxification. Recent trends in medical practice have seen the emergence of newer techniques that claim to accelerate the detoxification procedure and ensure prevention of relapse by rapid induction onto maintenance treatment with opioid antagonists such as naltrexone. This review delves into the theoretical and methodological aspects related to ultra-rapid opioid detoxification (opioid detoxification procedure using opioid antagonists, performed under general anaesthesia or heavy sedation) and discusses the status of the same in light of the available evidence regarding its applicability, safety and effectiveness. Although useful in some respects (especially in completion rates for detoxification and subsequent induction onto naltrexone maintenance), the justification of this procedure lies in (a) the resolution of the ethical conflicts surrounding the procedure and (b) conduction of methodologically sound long-term studies to demonstrate greater efficacy over routine/standard detoxification procedures beyond the short-term detoxification period.
Intelligent Control of pH in a Neutralization Process
N. Bharathi,J. Shanmugam,T.R. Rangaswamy
Asian Journal of Information Technology , 2012,
Abstract: In the present study, control of pH neutralization process using neural and fuzzy controller is proposed. Initially a conventional PI controller based on the Relay Feedback method is tried to control the pH at different linear regions. Control of pH by conventional PI controller based on the local linear model fails to provide satisfactory performance over the entire region. Hence to overcome this drawback a Neuro controller with inverse model anticipation and a fuzzy controller are used. In this study a novel fuzzy controller is used. Most fuzzy controllers use control error (e) and change in the control error ( e) as controller inputs and not able to differentiate the region in which process operates. This controller uses set point as third input to select the region in which the process is operating. An experimental study of the performance of the intelligent controllers designed is carried out on a pilot plant in the lab.
Long acting ophthalmic formulation of indomethacin: Evaluation of alginate gel systems
Pandit J,Bharathi D,Srinatha A,Ridhurkar D
Indian Journal of Pharmaceutical Sciences , 2007,
Abstract: Different types of in situ gelling systems of indomethacin, in sodium alginate vehicle, were prepared and evaluated for their pharmaceutical properties including viscosity, sterility and drug content uniformity. The gelling efficacy of the prepared systems was evaluated by using an in house fabricated gelation cell. The in vitro release kinetics of the prepared systems was determined in simulated tear. The gelling time and the nature of the gel formed were dependent on the concentration of sodium alginate present in the systems. The drug release from these systems was extended up to 8 h and predominately followed zero-order kinetics.
Tuberculoma of the liver
Bharathi A,Nagarjuna K,Prasad GVSN,Reddy J
Journal of Indian Association of Pediatric Surgeons , 2008,
Abstract: We report an isolated giant solid macronodular tuberculoma in an 8-year-old boy. A large-space-occupying lesion in the right lobe with nodular surface and hard consistency mimicked liver malignancy. This case is unusual as the ultrasonography, computed tomography scan, and aspiration cytology were all suggestive of a malignant tumor. Laparotomy confirmed a 15 x 10 cm nodular tumor present in the right lobe of liver. The segments 5, 6, 7, and 8 were excised. The histopathology revealed tuberculosis.
Final-state effects in the radio frequency spectrum of strongly interacting fermions
Sourish Basu,Erich J. Mueller
Physics , 2007, DOI: 10.1103/PhysRevLett.101.060405
Abstract: We model the impact of final state interactions on the radio frequency spectrum of a strongly interacting two-component superfluid Fermi gas. In addition to a broad asymmetric peak coming from the break-up of Cooper pairs we find that, for appropriate parameters, one can observe a sharp symmetric "bound-bound" spectral line coming from the conversion of Cooper pairs in one channels to pairs/molecules in another.
Stability of Bosonic atomic and molecular condensates near a Feshbach resonance
Sourish Basu,Erich J. Mueller
Physics , 2005,
Abstract: We explore the Bose condensed phases of an atomic gas on the molecular side of a Feshbach resonance. In the absence of atom-molecule and molecule-molecule scattering, we show that the atomic condensate is either a saddle point of the free energy with energy always exceeding that of the molecular condensate, or has a negative compressibility (hence unstable to density fluctuations). Therefore no phase transition occurs between the atomic and molecular condensates. We also show that a repulsive molecule-molecule scattering can stabilize a sufficiently dense atomic condensate, leading to the possibility of a phase transition. We caution that 3-body processes may render this transition unobservable.
Simulation and Implementation of Solar Powered Electric Vehicle  [PDF]
A. Bharathi Sankar, R. Seyezhai
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76055
Abstract: The rise in the price of oil and pollution issues has increased the interest on the development of electric vehicles. This paper discusses about the application of solar energy to power up the vehicle. The basic principle of solar based electric vehicle is to use energy that is stored in a battery to drive the motor and it moves the vehicle in forward or reverse direction. The Photo Voltaic (PV) module may be connected either in parallel or series, and the charge controllers direct this solar power to the batteries. The DC voltage from the PV panel is then boosted up using a boost DC-DC converter, and then an inverter, where DC power is converted to AC power, ultimately runs the Brushless DC motor which is used as the drive motor for the vehicle application. This paper focuses on the design, simulation and implementation of the various components, namely: solar panel, charge controller, battery, DC-DC boost converter, DC-AC power converter (inverter circuit) and BLDC motor for the vehicle application. All these components are modeled in MATLAB/SIMULINK and in real-time, the hardware integration of the system is developed and tested to verify the simulation results.
Tabu Search Implementation on Traveling Salesman Problem and Its Variations: A Literature Survey  [PDF]
Sumanta Basu
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.22019
Abstract: The Traveling Salesman Problem (TSP) and its allied problems like Vehicle Routing Problem (VRP) are one of the most widely studied problems in combinatorial optimization. It has long been known to be NP-hard and hence research on developing algorithms for the TSP has focused on approximate methods in addition to exact methods. Tabu search is one of the most widely applied metaheuristic for solving the TSP. In this paper, we review the tabu search literature on the TSP and its variations, point out trends in it, and bring out some interesting research gaps in this literature.
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