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Reconstructing Missing Hourly Real-Time Precipitation Data Using a Novel Intermittent Sliding Window Period Technique for Automatic Weather Station Data

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Journal of Meteorological Research 2017年第4期31卷 774-790页

作者： nagaraja hema Krishna KANT Department of Computer Science and Engineering/Information Technology Jaypee Institute of Information Technology Noida 201307 India

Precipitation is the most discontinuous atmospheric parameter because of its temporal and spatial variability. Precipitation observations at automatic weather stations（AWSs） show different patterns over different time periods. This paper aims to reconstruct missing data by finding the time periods when precipitation patterns are similar, with a method called the intermittent sliding window period（ISWP） technique—a novel approach to reconstructing the majority of non-continuous missing real-time precipitation data. The ISWP technique is applied to a 1-yr precipitation dataset（January 2015 to January 2016）, with a temporal resolution of 1 h, collected at 11 AWSs run by the Indian Meteorological Department in the capital region of Delhi. The acquired dataset has missing precipitation data amounting to 13.66%, of which 90.6% are reconstructed successfully. Furthermore, some traditional estimation algorithms are applied to the reconstructed dataset to estimate the remaining missing values on an hourly basis. The results show that the interpolation of the reconstructed dataset using the ISWP technique exhibits high quality compared with interpolation of the raw dataset. By adopting the ISWP technique, the root-mean-square errors（RMSEs）in the estimation of missing rainfall data—based on the arithmetic mean, multiple linear regression, linear regression,and moving average methods—are reduced by 4.2%, 55.47%, 19.44%, and 9.64%, respectively. However, adopting the ISWP technique with the inverse distance weighted method increases the RMSE by 0.07%, due to the fact that the reconstructed data add a more diverse relation to its neighboring AWSs.

关键词： automatic weather station intermittent sliding window period interpolation mean absolute error reconstruction of missing precipitation data

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Evidence-based assessment of proton-pump inhibitors in Helicobacter pylori eradication: A systematic review

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World Journal of Gastroenterology 2014年第40期20卷 14527-14536页

作者： Vinayak nagaraja Guy D Eslick The Whiteley-Martin Research Centre Discipline of Surgery The University of Sydney Nepean Hospital Penrith NSW 2751 Australia

Peptic ulcer disease continues to be issue especially due to its high prevalence in the developing *** pylori(***)infection associated duodenal ulcers should undergo eradication *** are many regimens offered for *** eradication which include triple,quadruple,or sequential therapy *** central aim of this systematic review is to evaluate the evidence for *** therapy from a meta-analytical *** consequence of the dose,type of proton-pump inhibitor,and the length of the treatment will be *** most important risk factor for eradication failure is resistance to clarithromycin and metronidazole.

关键词： Helicobacter pylori Peptic ulcer disease Systematic review Proton-pump inhibitors

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Discrete Wavelet Transmission and Modified PSO with ACO Based Feed Forward Neural Network Model for Brain Tumour Detection

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Computers, Materials & Continua 2020年第11期65卷 1081-1096页

作者： Machiraju Jayalakshmi S.nagaraja Rao Department of Electrical&Computer Engineering JNTUA AnantapuramuAndhra PradeshIndia Department of ECE G.Pulla Reddy Engineering College(Autonomous)KurnoolAndhra PradeshIndia

In recent years,the development in the field of computer-aided diagnosis(CAD)has increased *** traditional machine learning algorithms have been proposed for identifying the pathological brain using magnetic resonance *** existing algorithms have drawbacks with respect to their accuracy,efficiency,and limited learning *** address these issues,we propose a pathological brain tumour detection method that utilizes the Weiner filter to improve the image contrast,2D-discrete wavelet transformation(2D-DWT)to extract the features,probabilistic principal component analysis(PPCA)and linear discriminant analysis(LDA)to normalize and reduce the features,and a feed-forward neural network(FNN)and modified particle swarm optimization(MPSO)with ant colony optimization(ACO)to improve the accuracy,stability,and overcome fitting issues in the classification of brain magnetic resonance *** proposed method achieves better results than other existing algorithms.

关键词： Discrete wavelet transformation ant colony optimization feed-forward neural network linear discriminant analysis

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Irreversibility investigation of Casson fluid flow in an inclined channel subject to a Darcy-Forchheimer porous medium:a numerical study

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Applied Mathematics and Mechanics(English Edition) 2021年第1期42卷 95-108页

作者： A.ROJA B.J.GIREESHA B.nagaraja Department of PG Studies and Research in Mathematics Kuvempu UniversityShankaraghattaShimoga 577451KarnatakaIndia

The heat transfer and entropy generation characteristics of the magnetohydrodynamic Casson fluid flow through an inclined microchannel with convective boundary conditions are ***,the effects of the viscous forces,Joule heating,heat source/sink,and radiation on the flow are taken into *** non-dimensional transformations are used to solve the governing ***,the reduced system is resolved by the fourth-fifth order Runge-Kutta-Fehlberg method along with the shooting *** effects of different physical parameters on the heat transfer and entropy generation are discussed in detail through *** the perspective of numerical results,it is recognized that the production of entropy can be improved with the Joule heating,viscous dissipation,and convective heating *** is concluded that the production of entropy is the maximum with increases in the Casson parameter,the angle of inclination,and the Hartmann *** the Reynolds number and the radiation parameter cause the dual impact on entropy generation.

关键词： inclined channel Casson fluid magnetism radiation entropy generation Bejan number

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Assessment of high-gain quadratic boost converter with hybrid-based maximum power point tracking technique for solar photovoltaic systems

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Clean Energy 2022年第4期6卷 632-645页

作者： Veerabhadra S.nagaraja Rao M S Ramaiah University of Applied Sciences Department of Electrical EngineeringBangaloreIndia

Solar photovoltaic(SPV)modules have a low output voltage and are ***,it is critical that the SPV system has an adequate DC-DC converter to regulate and improve the output voltage to get maximum output *** meet load requirements,the voltage must be increased,necessitating the use of energy-efficient power electronic *** performance of an SPV system coupled to a high-gain quadratic boost converter(HG-QBC)with a load is investigated in this *** suggested HG-QBC for the SPV system at a lower value of duty ratio provides high voltage gain with a boost factor of four *** analytical comparison is carried out with the various existing boost converters in terms of the components and the boost *** issue of locating the maximum power generation point from the SPV system is *** a result,choosing an appropriate maximum power point tracker(MPPT)-based technique to obtain the peak power output of the SPV system under the rapidly varying atmospheric conditions is *** determine the highest output power of an SPV system,a hybrid-based MPPT with a neural network assisted by a perturb and observe(P&O)technique is *** the HG-QBC,a comparison of the proposed MPPT with a traditional P&O-based MPPT is *** comparative analysis takes into account rise time,settling time and voltage *** output voltage and power characteristics of the proposed model are analysed under constant and varying irradiation conditions using MATLAB®/Simulink®.The results of a hybrid-based MPPT show that the oscillations are minimum at the maximum power point with fewer ripples of 0.20%and a settling time of 1.2 s in comparison with the other two techniques.

关键词： neural network maximum power point tracker renewable energy sources power electronic converters solar photovoltaic and high-gain quadratic boost converter

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Switching angle optimization and fault analysis of a multistring-multilevel inverter for renewable-energy-source applications

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Clean Energy 2022年第6期6卷 907-930页

作者： Savitha M S.nagaraja Rao MS Ramaiah University of Applied Sciences Department of Electrical EngineeringBangaloreIndia

In this paper,a multistring-multilevel inverter(M-MLI)for renewable-energy-source applications has been proposed with reduced switch count and harmonics along with single-switch fault analysis for various *** requires only‘m+1’power switches for‘m’voltage *** proposed work achieves the fine-tuning of switching angles using a metaheuristic technique,*** teaching-learning-based optimization algorithm(TLBOA),to mitigate the total harmonic distortion(THD)of the ***,the proposed TLBOA has been compared with conventional modulation techniques such as equal phase(EP),half-equal phase(HEP),near-level control(NLC)and Newton-Raphson(NR)to verify the effectiveness of TLBOA for various voltage levels in terms of%voltage-THD(%V-THD),computational time and *** fine-tuning the switching angles,the%V-THD is improved significantly when compared with EP,HEP,NLC and NR modulation *** an 11-level single-phase M-MLI,the%V-THD using TLBOA at 0.91 modulation index(MI)is 5.051%.The lower-order harmonics,i.e.5,7,11 and 13,are eliminated to improve the power ***,MLIs are often prone to failure,resulting in waveform *** extreme reduction in power quality impacts the load and significant damage is *** location of the open-circuit fault to be identified becomes more tedious under the faulty conditions with increased switch counts and voltage levels since the mathematical modelling fails to address the scenario in less computational ***,the machine-learning approach,*** vector machine(SVM)with Bayesian optimization,has been discussed to locate the faulty ***,the proposed M-MLI configuration has been modelled,simulated and validated using MATLAB®and Simulink®.The results of the M-MLI configuration have been verified for 7,9 and 11 levels using TLBOA along with fault analysis using the SVM approach.

关键词： TLBO fault resilience multistring-multilevel inverters renewable-energy applications

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Unveiling the shadows: a qualitative exploration of barriers to rooftop solar photovoltaic adoption in residential sectors

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Clean Energy 2024年第5期8卷 218-228页

作者： Tony C.Mathew Sridevi nagaraja Pandian School of Commerce Kumaraguru College of Liberal Arts and ScienceCoimbatore 641035Tamil NaduIndia

In the face of global climate change,the urgent shift towards renewable energy sources such as solar power is vital for reducing greenhouse gas emissions and fostering a sustainable future,presenting a universal challenge and opportunity for energy policy ***’s adoption of rooftop solar photovoltaic is pivotal due to its vast solar potential,which aligns with national goals to increase renewable energy capacity,reduce carbon emissions,and achieve energy ***’s geographical location offers abundant solar potential,making it a prime candidate for the adoption of rooftop solar photovoltaic *** with the state’s strong commitment to renewable energy initiatives such as the ambitious“SOURA”(solar subsidy program by the Kerala State Electricity Board)project and various incentives for solar adoption,Kerala stands at the forefront of India’s transition towards sustainable energy *** the barriers to rooftop solar photovoltaic adoption in Kerala is crucial for tailoring ef-fective policies and strategies that address specific hindrances from economic constraints to informational *** study employs a qualitative research method to identify the barriers to rooftop solar photovoltaic adoption among households in *** face-to-face interviews with a purposively selected sample of 52 households,the research aims to gain in-depth insights into the multifaceted challenges hindering the widespread adoption of solar energy in residential *** findings reveal several key barriers:financial barriers,informational barriers,technical barriers,regulatory barriers,social barriers,and psychological *** analysis indicates that while there is a predominantly positive attitude towards solar photovoltaic adoption,there are sig-nificant concerns that still need to be *** these barriers with targeted policy interventions and public awareness campaigns could significantly enhance the adoptio

关键词： rooftop solar photovoltaic adoption barriers to solar energy residential solar systems Kerala solar initiatives qualitative analysis in renewable energy

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Consequence of exponential heat generation on non-Darcy- Forchheimer flow of water based carbon nanotubes driven by a curved stretching sheet

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Applied Mathematics and Mechanics(English Edition) 2020年第11期41卷 1723-1734页

作者： B.J.GIREESHA B.nagaraja S.SINDHU G.SOWMYA Department of P.G.Studies and Research in Mathematics Kuvempu UniversityShankaraghatta 577451India

The present article comprises the study on the influence of exponential space based heat generation on the non-Darcy-Forchheimer flow of carbon nanotubes(CNTs).The flow is considered over a curved stretching *** variables are used to reduce the flow descriptive nonlinear partial derivative equations to simple *** equations are then solved by the exploiting Runge-Kutta-Fehlberg fourth-and fifth-order *** numerical solutions are shown in graphs and *** between single and multi-walled CNTs has been established through the tabulated values and plotted *** is concluded that the heat source parameter plays a prime role in enhancement of temperature,and the curvature parameter has adverse impact on velocity and temperature *** the inertial parameter and inverse-Darcy number affect the fluid velocity.

关键词： exponential heat generation non-Darcy-Forchheimer flow carbon nanotube(CNT) curved stretching sheet

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Magnetically propelled Carreau fluid flow over penetrable sensor surface influenced by thermal radiation,Joule heating and heat generation

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Communications in Theoretical Physics 2022年第2期74卷 9-18页

作者： B J Gireesha B nagaraja N Srikantha N G Rudraswamy A Felicita Department of Studies and Research in Mathematics Kuvempu UniversityShankaraghattaShivamoggaKarnatakaIndia Department of Mathematics MS Ramaiah Institute of TechnologyBangaloreIndia Department of Mathematics P.C.Jabin Science College(Autonomous)HubballiIndia

This examination emphasizes the analysis of thermal transmission of Carreau fluid flow on a permeable sensor surface equipped with radiation,Joule heating,an internal heat source,and a magnetic *** the above effects and assumptions,the equations that administer the flow are formulated.A configured system of equations is productively reduced to a system of ordinary differential *** reduced system is then dealt with using the Runge–Kutta-Fehlberg fourth–fifth order tool equipped by the shooting *** numerical solutions are utilized to plot graphs and *** conclusion of the study outlines some important findings such as the power law index,the thermal radiation parameter and the heat source parameter enhance the thermal panel whereas the Weissenberg number deescalates the *** power law index and permeable velocity decrease the velocity panel *** representation of streamlines of the flow has been given to strengthen the study.A detailed description has been produced about the results obtained in the study.

关键词： sensor surface Carreau fluid squeezed flow thermal radiation heat generation

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Wind energy conversion system using perturb&observe-based maximum power point approach interfaced with T-type three-level inverter connected to grid

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Clean Energy 2022年第4期6卷 534-549页

作者： Pranupa S A.T.Sriram S.nagaraja Rao M S Ramaiah University of Applied Sciences BangaloreIndia

In this paper,the performance of a permanent magnet synchronous generator(PMSG)-based wind energy conversion system(WECS)supplied to an uncontrolled rectifier-fed boost converter(BC)interfaced with a three-phase T-type three-level inverter(TLI)has been *** proposed WECS involves three converters,namely an uncontrolled rectifier that is used for conversion from AC to DC;a BC supplied by a PMSG-fed rectifier used to enhance the voltage gain;and a grid-connected three-phase T-type TLI is proposed to eliminate power-quality issues with synchronization of grid voltage and *** main goal of this research is to model and control the grid-connected T-type TLI using a d-q synchronous frame for wind energy for regulating the DC-link voltage and transferring the generated wind power from the BC to the ***,the perturb&observe(P&O)-based maximum power point(MPP)approach is recommended to keep track of the MPP for a BC that is supplied from a PMSG-based WECS under constant and variable wind *** proposed PMSG-based WECS interfaced with grid-connected T-type TLI using d-q control has been computationally modelled,simulated and validated with constant and variable speeds using MATLAB®and Simulink®.It is confirmed that the P&O-based MPP approach ensures maximum power for varying wind speeds,and the total harmonic distortion of the T-type TLI grid current value is 3.18%,which is within IEEE-519 ***,with grid synchronization,the power factor of the T-type TLI is maintained at unity to avoid power-quality issues.

关键词： boost converter grid synchronization perturb&observe T-type three-level inverter wind turbine

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