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Petroleum Science 2014年第3期11卷 439-445页

作者： Sugumar Ramasamy prabhakaran mathiyalagan Preethy Chandran Centre for Nanotechnology and Advanced Biomaterials School of Chemical and Biotechnology SASTRA University

Petroleum refinery wastewater （PRW） containing hydrocarbon is highly toxic to the environment and the surrounding ecosystem. Proper treatment of the PRW effluent is necessary to remove the pollutants before discharge. Bioremediation is considered to be a promising approach as it is eco- friendly and efficient. The exopolysaccharide （EPS） produced by the O. anthropi acts as a bioemulsifier and showed the highest emulsification activity of 60% on diesel. An EPS yield of about 0.42 g/L was obtained under optimized conditions. The carbohydrate and protein content of the EPS was found to be 71.1% and 19.7% respectively, showing the glycoprotein nature. The structural properties of EPS were analyzed by FT-IR and 1H NMR. The batch degradation of oil in PRW by O. anthropi was studied gravimetrically, and showed about 53% degradation in 7 days, indicating the strong ability of the isolated strain to degrade the hydrocarbons in PRW.

关键词： Hydrocarbons Ochrobactrum anthropi MP3 EPS bioemulsifier degradation

Laboratory Implementation of Direct Torque Controller based Speed Loop Pseudo Derivative Feedforward Controller for PMSM Drive

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 12-21页

作者： prabhakaran Koothu Kesavan Umashankar Subramaniam Dhafer J.Almakhles IEEE Renewable Energy Laboratory Department of Electrical EngineeringPrince Sultan UniversityRiyadh 12435Saudi Arabia

This paper,evaluate the effectiveness of a proposed speed loop pseudo derivative feedforward(PDFF)controller-based direct torque controller(DTC)for a PMSM drive against the performance of existing PI speed controller-based DTC and hysteresis current controller(HCC).The proposed PDFF-based speed regulator effectively reduces oscillation and overshoot associated with rotor angular speed,electromagnetic torque,and stator *** case studies,one using forward-to-reverse motoring operation and the other involving reverse-to-forward braking operation,has been validated to show the effectiveness of the proposed control *** proposed controller's superior performance is demonstrated through experimental verification utilizing an FPGA controller for a 1.5 kW PMSM drive laboratory prototype.

关键词： Direct torque control Pseudo derivative feedforward controller Permanent magnet synchronous motor(PMSM)

A Simple Primary Key Algorithm Based Shade Dispersion Method for Maximizing PV Power Generation under Partial Shading Conditions

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Chinese Journal of Electrical Engineering 2024年第2期10卷 93-102页

作者： prabhakaran Koothu Kesavan A.Karthikeyan Manoj Kumar Sushant Mandal Renewable Energy Laboratory Prince Sultan UniversityRiyadh 11586Saudi Arabia Department of Electrical and Electronics Engineering National Institute of Technology KarnatakaMangalore 575025India

The output power generation of a photovoltaic(PV)array reduces under partial shading,resulting in multiple local maxima in the PV characteristics and inaccurate tracking of the global maximum power point(GMPP).Various interconnection schemes are available to reduce power losses under partial *** this study,a primary key algorithm is proposed for distributing shading across an *** method is suitable for any n×n PV array configuration and involves fewer calculations and variables,leading to reduced computational *** power generations of a 9×9 PV array under four different shading conditions were compared with the configurations of:total cross-tied(TCT)and Su Du Ku,physical relocation and fixed column position of modules with fixed electrical connection(PRFCPM-FEC),and magic square(MS)and improved-odd-even-prime(IOEP).The advantage of the proposed method is that once the primary key elements are obtained,the remaining array elements are numbered in a simpler *** results obtained using the proposed arrangement show that the power is enhanced with reference to the TCT and is comparable to the Su Do Ku,PRFCPM-FEC,MS,and IOEP reconfigurations.

关键词： Photovoltaic(PV)array partial shading global maximum power point(GMPP) power loss primary key

Heavy metal pollution of river water and eco-friendly remediation using potent microalgal species

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Water Science and Engineering 2024年第1期17卷 41-50页

作者： Amudham Radha Amal Raj prabhakaran Mylsamy V.Sivasankar B.Sathish Kumar Kiyoshi Omine T.G.Sunitha Phycological Research Laboratory Research Department of BotanyPachaiyappa's College(Affiliated to University of Madras)Chennai 600030India Research Department of Chemistry Pachaiyappa's College(Affiliated to University of Madras)Chennai 600030India Department of Botany Sri Vidya Mandir Arts&Science College(Autonomous)KatteriUthangarai 636902India Department of Civil Engineering School of Engineering.Nagasaki UniversityNagasaki-Daigaku1-14 Bunkyo-machiNagasaki 8528521Japan

Pollution of rivers is mainly caused by anthropogenic activities such as discharge of effluent from industrial facilities,maintenance of sewage/effluent treatment plants,and dumping of solid waste on river *** study dealt with the pollution issues of the Cooum River in the well-known city of Chennai in South *** samples from 27 locations were collected and analyzed for 12 elements,including Ba,B,and Al,as well as heavy metals such as Pb,Cr,Mn,Fe,Co,Ni,Cu,Zn,and *** samples showed levels of these elements that exceeded World Health Organization *** correlation analysis revealed the inter-dependency among elements,and the contribution of each element based on factor loadings showed its percentage contribution compared to *** samples from six significant locations were chosen for remediation with three algae:Chlorella vulgaris,Scenedesmus dimorphus,and Phormedium *** uptake of pollutants led to the continuous growth of algae during the incubation period of 15 d,effectively removing heavy metals from the river *** increasing levels of algal counts and the chlorophyll a content confirmed the algal growth during the incubation period,followed by a declining stage after the incubation *** scanning electron microscopic images of algae before and after the remediation showed no remarkable modification of morphological *** study showed that the uptake of heavy metals using algae is an effective water pollution remediation measure,making the process practicable in the field on a large scale in the near future.

关键词： Heavy metal Cooum river Phycoremediation Microalgae Factor analysis

Stability Analysis of Network Controlled Temperature Control System with Additive Delays

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Computer Modeling in Engineering & Sciences 2018年第3期114卷 321-334页

作者： V.Venkatachalam D.prabhakaran Department of Chemical Engineering Coimbatore Institute of TechnologyCoimbatore-641014India

This paper presents,using Lyapunov-Krasovskii functional technique combined with reciprocal convex lemma is considered for a networked control temperature control system with additive *** the stability analysis,a new LK functional is assumed,and take the time-derivative of the(LK)functional,using reciprocal convex combination technique was employed to obtain less conservative stability ***,the proposed stability analysis culminates into a stability criterion in the LMI(linear matrix inequalities)*** results obtained are in accordance with the theoretically obtained in the temperature control system and they are closer to the standard benchmark temperature-control system.

关键词： Delay-dependent stability time-varying additive delays temperature control heat exchanger lyapunov-krasovskii functional linear matrix inequality reciprocal convex lemma

Thermally insulating robust carbon composite foams with high EMI shielding from natural cotton

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Journal of Materials Science & Technology 2021年第35期94卷 113-122页

作者： A.Chithra Praveen Wilson Sujith Vijayan R.Rajeev K.prabhakaran Department of Chemistry Indian Institute of Space Science and TechnologyThiruvananthapuram 695547India Analytical and Spectroscopy Division Vikram Sarabhai Space CentreThiruvananthapuram 695022India

Thermally insulating and fire-resistant carbon composite foams are prepared by consolidating natural cotton fibre dispersed in aqueous sucrose solution by filter-pressing followed by drying and *** compressive strength(5 kPa to 1.4 MPa)and thermal conductivity(0.069 to 0.185 W m^(-1)K^(-1))depend on the foam density(0.06 to 0.31 g cm^(-3))which is modulated by varying the sucrose solutions concentration(100 to 700 g L^(-1)).Partially flexible to the rigid transition of the carbon composite foams occurs at sucrose concentration above 200 g L^(-1).The tubular carbon fibre formed from cotton is welded at their contact points by the amorphous carbon produced from sucrose leading to partial flexibility at low sucrose concentration and advancement of fibre-to-fibre bonding area at higher sucrose concentration results in rigid *** porosity in the inter-fibre space and lumen of the carbonized cotton fibre contributes to the low thermal *** carbon composite foams prepared at a sucrose solution concentration of 500 g L^(-1) and above are amenable to machining using conventional machines and *** rigid carbon foams show EMI shielding effectiveness and specific shielding effectiveness in the ranges of 21.5 to 38.9 d B and 108-138 dB cm^(3) g^(-1),respectively.

关键词： Foams natural fibres thermal properties consolidation mechanical properties emi shielding properties

Deep Learning-Based Model for Defect Detection and Localization on Photovoltaic Panels

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Computer Systems Science & Engineering 2023年第3期44卷 2683-2700页

作者： S.prabhakaran R.Annie Uthra J.Preetharoselyn Department of Computational Intelligence SRM Institute of Science and TechnologyChengalpattu603203India Department of Electrical Engineering SRM Institute of Science and TechnologyChengalpattu603203India

The Problem of Photovoltaic(PV)defects detection and classification has been well *** techniques exist in identifying the defects and localizing them in PV panels that use various features,but suffer to achieve higher *** efficient Real-Time Multi Variant Deep learning Model(RMVDM)is presented in this article to handle this *** method considers different defects like a spotlight,crack,dust,and micro-cracks to detect the defects as well as loca-lizes the *** image data set given has been preprocessed by applying the Region-Based Histogram Approximation(RHA)*** preprocessed images are applied with Gray Scale Quantization Algorithm(GSQA)to extract the *** features are trained with a Multi Variant Deep learning model where the model trained with a number of layers belongs to different classes of *** class neuron has been designed to measure Defect Class Support(DCS).At the test phase,the input image has been applied with different operations,and the features extracted passed through the model *** output layer returns a number of DCS values using which the method identifies the class of defect and localizes the defect in the ***,the method uses the Higher-Order Texture Localization(HOTL)technique in localizing the *** pro-posed model produces efficient results with around 97%in defect detection and localization with higher accuracy and less time complexity.

关键词： Photovoltaic systems deep learning defect detection classification localization

Single-stage PV-powered boost inverter-fed permanent-magnet synchronous motor-driven water-pumping system

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Clean Energy 2022年第5期6卷 726-737页

作者： K.K.prabhakaran Varsha Sunkara A.Karthikeyan Department of Electrical and Electronics Engineering National Institute of Technology KarnatakaSurathkalIndia

In this paper,a photovoltaic(PV)fed boost inverter-based permanent-magnet synchronous motor(PMSM)-driven water-pumping system for stand-alone applications is *** proposed system comprises PV panel,six switches,three inductors(L),three capacitors(C)and a water *** this work,the boost inverter is designed with a gain of two and thereby the direct current input required to run the motor is considerably ***,the size of the system is *** voltage gain factor depends upon the placement of the L and C components and their *** speed reference is generated using a perturb and observe maximum power point tracking *** control is employed to control a boost inverter-fed PMSM *** proposed system is simulated using a MATLAB®/Simulink®environment and experimental validation is performed on a PMSM laboratory prototype using a field programmable gate array *** simulation and experimental results demonstrate the effectiveness of the proposed system.

关键词： boost inverter MPPT PV PMSM water pump

Hierarchical Metal-Organic Frameworks with Macroporosity:Synthesis, Achievements,and Challenges

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Nano-Micro Letters 2019年第3期11卷 281-313页

作者： Huan VDoan Harina Amer Hamzah Prasanth Karikkethu prabhakaran Chiara Petrillo Valeska PTing Department of Mechanical Engineering University of BristolBristol BS81TRUK Department of Oil Refining and Petrochemistry Hanoi University of Mining and GeologyDuc ThangBac Tu LiemHanoiVietnam

Introduction of multiple pore size regimes into metalorganic frameworks(MOFs)to form hierarchical porous structures can lead to improved performance of the material in various *** many cases,where interactions with bulky molecules are involved,enlarging the pore size of typically microporous MOF adsorbents or MOF catalysts is crucial for enhancing both mass transfer and molecular *** this review,we examine the range of synthetic strategies which have been reported thus far to prepare hierarchical MOFs or MOF composites with added *** fabrication techniques can be either pre-or post-synthetic and include using hard or soft structural template agents,defect formation,routes involving supercritical CO2,and 3D *** also discuss potential applications and some of the challenges involved with current techniques,which must be addressed if any of these approaches are to be taken forward for industrial applications.

关键词： Metal-organic frameworks Hierarchical Macroporous Composites

Stable haptic interaction based on adaptive hierarchical shape matching

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Computational Visual Media 2015年第3期1卷 253-265页

作者： Yuan Tian Yin Yang Xiaohu Guo Balakrishnan prabhakaran University of Texas at Dallas University of New Mexico

In this paper, we present a framework allowing users to interact with geometrically complex3 D deformable objects using(multiple) haptic devices based on an extended shape matching approach. There are two major challenges for haptic-enabled interaction using the shape matching method. The first is how to obtain a rapid deformation propagation when a large number of shape matching clusters exist. The second is how to robustly handle the collision response when the haptic interaction point hits the particlesampled deformable volume. Our framework extends existing multi-resolution shape matching methods,providing an improved energy convergence rate. This is achieved by using adaptive integration strategies to avoid insignificant shape matching iterations during the simulation. Furthermore, we present a new mechanism called stable constraint particle coupling which ensures consistent deformable behavior during haptic interaction. As demonstrated in our experimental results, the proposed method provides natural and smooth haptic rendering as well as efficient yet stable deformable simulation of complex models in real time.

关键词： deformation haptic rendering shape matching multi-resolution