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Nanosecond pulse discharge based nitrogen oxides treatment using different electrode configurations

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High Voltage 2017年第2期2卷 60-68页

作者： Sankarsan Mohapatro srikanth allamsetty Apeksha Madhukar Nikhil Kumar Sharma DEI Lab School of Electrical SciencesIndian Institute of Technology BhubaneswarBhubaneswarOdisha 751013India HV Lab Department of Electrical EngineeringIndian Institute of ScienceBangaloreKarnataka 560012India

Nowadays,the intensity of air pollution,due to the industries and automobiles,has been increasing *** oxides(NO_(X))are one of the most harmful pollutants,which are getting released from both automobile and stationary diesel *** essentially need to be removed from the exhaust using after treatment ***,the energy required to remove these pollutants is one of the major considerations in selecting the technology for pollutant removal from diesel engine exhaust.A study has been carried out on the non-thermal plasma-based NO_(X) removal technique using various combinations of power supply units and electrode *** different electrode configurations are tested,in which two are cylindrical electrodes with diameters 3 and 5 mm,and the other one is a square electrode with a diagonal of 5 mm.A comparison is made between the results with two different pulse power supply units,PS-I:high-voltage direct current test set based and PS-II:DC–DC converter *** square electrode with PS-Ⅱhas been found to be the optimal combination,which has removed 85%of NO_(X) from the exhaust at an energy density of 55.5 J/L,when the initial NO_(X) concentration in the exhaust is 388 ppm.

关键词： electrode removed treatment

Deterioration models for prediction of remaining useful life of timber and concrete bridges:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第2期7卷 152-173页

作者： Ishwarya srikanth Madasamy Arockiasamy Department of Civil Environmental and Geomatics EngineeringFlorida Atlantic UniversityBoca RatonFL 33431USA

Bridge deterioration models are used for prioritization and maintenance of *** models can be broadly classified as deterministic and stochastic *** are mechanistic models(or physical models)as well as Artificial Intelligence(AI)-based models,each of which can be stochastic or deterministic in *** though there are several existing deterioration models,state-based stochastic Markov chain-based model is widely employed in bridge management *** paper presents a critical review of different bridge deterioration models highlighting the advantages and limitations of each *** models are applied to some case studies of timber superstructure and concrete bridge *** are illustrated for arriving at bridge deterioration models using deterministic,stochastic and Artificial Neural Network(ANN)-based models based on National Bridge Inventory(NBI)*** first example is based on deterministic model and the second on stochastic *** deterministic model uses the NBI records for the years 1992-2012,while the stochastic model uses the NBI records for one year(2011-2012).The stochastic model is state-based Markov chain model developed using Transition Probability Matrix(TPM)obtained by Percentage Prediction Method(PPM).The two deterioration models(i.e.,deterministic and stochastic models)are applied to timber highway bridge superstructure using NBI condition data for bridges in Florida,Georgia,South Carolina and North *** illustrated examples show that the deterministic model provides higher accuracy in the predicted condition value than the stochastic Markov chain-based *** the model is developed based on average of transition probabilities considering the data for the period 1992 to 2012,the prediction accuracy of stochastic model will *** data filtering of condition records aids in improving the accuracy of the deterministic *** third example illustrates the ANN-based deterioration model for r

关键词： Bridge engineering Timber and concrete bridge Deterioration model Markov chain Artificial Neural Network

Using Markov chains to predict the natural progression of diabetic retinopathy

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International Journal of Ophthalmology(English edition) 2015年第1期8卷 132-137页

作者： Priyanka srikanth Jaslok Hospital & Research Centre

AIM: To study the natural progression of diabetic retinopathy in patients with type 2 ***: This was an observational study of 153 cases with type 2 diabetes from 2010 to 2013. The state of patient was noted at end of each year and transition matrices were developed to model movement between years. Patients who progressed to severe non-proliferative diabetic retinopathy(NPDR) were *** Chains and Chi-square test were used for statistical ***: We modelled the transition of 153 patients from NPDR to blindness on an annual basis. At the end of year 3, we compared results from the Markov model versus actual data. The results from Chi-square test confirmed that there was statistically no significant difference(P =0.70) which provided assurance that the model was robust to estimate mean sojourn times. The key finding was that a patient entering the system in mild NPDR state is expected to stay in that state for 5y followed by 1.07 y in moderate NPDR, be in the severe NPDR state for 1.33 y before moving into PDR for roughly8 y. It is therefore expected that such a patient entering the model in a state of mild NPDR will enter blindness after 15.29 ***: Patients stay for long time periods in mild NPDR before transitioning into moderate ***, they move rapidly from moderate NPDR to proliferative diabetic retinopathy(PDR) and stay in that state for long periods before transitioning into blindness.

关键词： diabetes mellitus diabetic retinopathy Markov Chains Chi-square test transition probability matrix

Robust frequency control in a renewable penetrated power system: an adaptive fractional order-fuzzy approach

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Protection and Control of Modern Power Systems 2019年第1期4卷 193-207页

作者： Anil Annamraju srikanth Nandiraju Department of Electrical Engineering National Institute of Technology WarangalWarangalTelangana506004India

Purpose Load frequency control(LFC)in today’s modern power system is getting complex,due to intermittency in the output power of renewable energy sources along with substantial changes in the system parameters and *** address this problem,this paper proposes an adaptive fractional order(FO)-fuzzy-PID controller for LFC of a renewable penetrated power ***/methodology/approach To examine the performance of the proposed adaptive FO-fuzzy-PID controller,four different types of controllers that includes optimal proportional-integral-derivative(PID)controller,optimal fractional order(FO)-PID controller,optimal fuzzy PID controller,optimal FO-fuzzy PID controller are compared with the proposed *** dynamic response of the system relies upon the parameters of these controllers,which are optimized by using teaching-learning based optimization(TLBO)*** simulations are carried out using MATLAB/SIMULINK *** The simulation outcomes reveal the supremacy of the proposed approach in dynamic performance improvement(in terms of settling time,overshoot and error reduction)over other controllers in the literature under different ***/value In this paper,an adaptive FO-fuzzy-PID controller is proposed for LFC of a renewable penetrated power *** main contribution of this work is,a maiden application has been made to tune all the possible parameters of fuzzy controller and FO-PID controller simultaneously to handle the uncertainties caused by renewable sources,load and parametric variations.

关键词： Adaptive fractional order-fuzzy-PID controller Renewable energy sources Load frequency control TLBO algorithm

Coordinated control of conventional power sources and PHEVs using jaya algorithm optimized PID controller for frequency control of a renewable penetrated power system

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Protection and Control of Modern Power Systems 2019年第1期4卷 355-367页

作者： Anil Annamraju srikanth Nandiraju Research Scholar Department of Electrical EngineeringNational Institute of Technology WarangalWarangalTelangana506004India

In renewable penetrated power systems, frequency instability arises due to the volatile nature of renewable energy sources (RES) and load disturbances. The traditional load frequency control (LFC) strategy from conventional power sources (CPS) alone unable to control the frequency deviations caused by the aforementioned disturbances. Therefore, it is essential to modify the structure of LFC, to handle the disturbances caused by the RES and load. With regards to the above problem, this work proposes a novel coordinated LFC strategy with modified control signal to have Plug-in Hybrid Electric Vehicles (PHEVs) for frequency stability enhancement of the Japanese power system. Where, the coordinated control strategy is based on the PID controller, which is optimally tuned by the recently developed JAYA Algorithm (JA). Numerous simulations are performed with the proposed methodology and, the results have confirmed the effectiveness of a proposed approach over some recent and well-known techniques in literature. Furthermore, simulation results reveal that the proposed coordinated approach significantly minimizing the frequency deviations compared to the JAYA optimized LFC without PHEVs & with PHEVs but no coordination.

关键词： PHEVs Optimized PID controller Coordinated control Load frequency control JAYA algorithm

Lepton and quark mixing patterns with generalized CP transformations

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Chinese Physics C 2022年第10期46卷 25-42页

作者： Joy Ganguly Raghavendra srikanth Hundi Department of Physics Indian Institute of Technology HyderabadKandi-502284India

In this study,we modify a scenario,originally proposed by Grimus and Lavoura,in order to obtain maximal values for the atmospheric mixing angle and CP,violating the Dirac phase of the lepton *** achieve this,we employ CP and some discrete symmetries in a type Ⅱ seesaw *** make predictions about the neutrino mass ordering and smallness of the reactor angle,we establish some conditions on the elements of the neutrino mass matrix of our ***,we study the quark masses and mixing pattern within the framework of our model.

关键词： neutrino physics nuetrino mass and mixing model quark mass and mixing analysis of scalar potential

Hybrid Offset Slider Crank Mechanism for Anthropomorphic Flexion in Prosthetic Hands

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Journal of Bionic Engineering 2023年第1期20卷 308-322页

作者： Banibrata Datta Sekar Anup Chander srikanth Vasamsetti CSIR-CSIO Sector-30CChandigarh160030India

The underactuated fingers used in prosthetic hands account for a large part of design consideration in anthropomorphic prosthetic hand *** are considerable numbers of designs available for underactuated prosthetic fingers in literature but,emulating the anthropomorphic flexion movement is still a challenge due to the complex nature of the *** address this challenge,a hybrid mechanism using both linkage-based mechanism and tendon-driven actuation has been proposed in this *** presented mechanism includes a novel offset slider-crank-based finger that has been designed using a combination of different lengths of cranks and connecting *** prototypes of both the new mechanism and the conventional tendon-driven mechanism are constructed and compared experimentally based on interphalangeal joint angle trajectory during *** angles achieved through the new hybrid mechanism are compared with the conventional tendon-driven mechanism and the Root Mean Square Error(RMSE)values have been calculated by comparing to the anthropomorphic flexion angles of the published *** RMSE values calculated for three interphalangeal joints of the hybrid mechanism are found to be less than their counter-parts of the conventional tendon-driven *** addition to achieving resemblance to anthropomorphic flexion angles,the mechanism is designed within the anthropometric human finger dimensions.

关键词： Anthropomorphism Hybrid mechanism Prosthetic-Slider-crank.Underactuated

A three-dimensional polyhedral unit model for grain boundary structure in fcc metals

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npj Computational Materials 2017年第1期3卷 361-373页

作者： Arash Dehghan Banadaki srikanth Patala Department of Materials Science and Engineering North Carolina State UniversityRaleighNCUSA

One of the biggest challenges in developing truly bottom-up models for the performance of polycrystalline materials is the lack of robust quantitative structure-property relationships for *** a first step in analyzing such relationships,we present a polyhedral unit model to classify the geometrical nature of atomic packing along grain *** the atomic structure in disordered systems has been a topic of interest for many decades,geometrical analyses of grain boundaries has proven to be particularly challenging because of the wide range of structures that are possible depending on the underlying macroscopic crystallographic *** this article,we propose an algorithm that can partition the atomic structure into a connected array of three-dimensional polyhedra,and thus,present a three-dimensional polyhedral unit model for grain boundaries.A point-pattern matching algorithm is also provided for quantifying the distortions of the observed grain boundary polyhedral *** polyhedral unit model is robust enough to capture the structure of high-Σ,mixed character interfaces and,hence,provides a geometric tool for comparing grain boundary structures across the five-parameter crystallographic *** the obtained polyhedral units circumscribe the voids present in the structure,such a description provides valuable information concerning segregation sites within the grain *** anticipate that this technique will serve as a powerful tool in the analysis of grain boundary *** polyhedral unit model is also applicable to a wide array of material systems as the proposed algorithm is not limited by the underlying lattice structure.

关键词： enough boundary structure

Probing the degradation of pharmaceuticals in urine using MFC and studying their removal efficiency by UPLC-MS/MS

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Journal of Pharmaceutical Analysis 2021年第3期11卷 320-329页

作者： Priya Sharma Devendra Kumar srikanth Mutnuri Applied Environmental Biotechnology Laboratory Birla Institute of Technology&Science(BITS)Pilani403726ZuarinagarIndia Central Sophisticated Instrumentation Facility Birla Institute of Technology&Science(BITS)Pilani403726ZuarinagarIndia Department of Pharmaceutical Sciences College of PharmacyUniversity of Nebraska Medical CenterOmahaNE68198-602USA

Nutrient recovery from source-separated human urine has attracted interest as it is rich in nitrogen and phosphorus that can be utilized as ***,urine also contains pharmaceuticals,steroid hormones,*** their removal is crucial as they have detrimental effects on the environment and human *** current study focuses on investigating the degradation of pharmaceuticals using a double-chamber microbial fuel cell(MFC).Urine was spiked with four pharmaceuticals(trimethoprim,lamivudine,levofloxacin,and estrone)at a concentration of 2 mg/*** MFC was operated for 7 months in batch mode with this spiked urine as *** degradation efficiency of the MFC was studied,for which a selective liquid chromatography-tandem mass-spectrometric method was developed for the quantitation of compounds used in the spiking experiments and was validated with a lower limit of quantification of 0.39 ng/*** maximum removal rate achieved was 96%±2%.The degradation mechanism involved processes like sorption and anoxic *** voltage curve obtained showed that the presence of pharmaceuticals had an initial negative impact on power generation along with increased organic content;however,after the reactor acclimatization,increased power output was achieved with maximum organics removal at 30 h of retention *** work opens a new perspective for the anoxic biodegradation of pharmaceuticals and can be useful in future bioremediation studies.

关键词： Pharmaceuticals Urine MFC Biodegradation Liquid chromatography mass spectroscopy