检索结果-南通市图书馆

Supergranular Fractal Dimension and Solar rotation

在线全文

学校读者我要写书评

暂无评论

research in Astronomy and Astrophysics 2022年第9期22卷 239-244页

作者： G.M.Sowmya G.rajani U.Paniveni r.srikanth GSSS Institute of Engineering and Technology for Women Mysuru-570016KarmatakaIndia PES College of Engineering Mandya-571401KarnatakaIndia Bangalore University JnanabharathiBengaluru-560056India Poornaprajna Institute of Scientific research DevanahalliBangalore-562110KamatakaIndia

We present findings from an analysis of the fractal dimension of solar supergranulation as a function of latitude,supergranular cell size and solar rotation, employing spectroheliographic data in the Ca II K line of solar cycle no.23. We find that the fractal dimension tends to decrease from about 1.37 at the equator to about 1 at 20° latitude in either hemisphere, suggesting that solar rotation rate has the effect of augmenting the irregularity of supergranular boundaries. Considering that supergranular cell size is directly correlated with fractal dimension, we conclude that the mechanism behind our observation is that solar rotation influences the cell outflow strength, and thereby cell size, with the latitude dependence of the supergranular fractal dimension being a consequence thereof.

关键词： Sun:chromosphere Sun:rotation Sun:magnetic fields

Solar Supergranular Fractal Dimension Dependence on the Solar Cycle Phase

在线全文

学校读者我要写书评

暂无评论

research in Astronomy and Astrophysics 2022年第4期22卷 55-61页

作者： G.rajani G.M.Sowmya U.Paniveni r.srikanth PES College of Engineering Mandya-571401KarnatakaIndia GSSS Institute of Engineering and Technology for Women KRS RoadMetagalli Mysuru-570016KarnatakaIndia Bangalore University JnanabharathiBengaluru-560056India Poornaprajna Institute of Scientific research DevanahalliBangalore-562110KarnatakaIndia

We study the complexity of the supergranular network through fractal dimension by using the Ca II K digitized data archive obtained from the Kodaikanal Solar *** data consist of 326 visually selected supergranular cells spread across the 23rd solar *** cells that were well-defined were chosen for the analysis and we discuss the potential selection effect thereof,mainly that it favors cells of a smaller size(ractal dimension of supergranules across the solar cycle and find that it is anticorrelated with the activity level.

关键词： Sun:chromosphere Sun:granulation Sun:activity

Feature Selection with Deep Belief Network for Epileptic Seizure Detection on EEG Signals

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第5期75卷 4101-4118页

作者： srikanth Cherukuvada r.Kayalvizhi Department of Networking and Communications School of ComputingSRM Institute of Science and TechnologyKattankulathurChennai603203India

The term Epilepsy refers to a most commonly occurring brain disorder after a *** identification of incoming seizures significantly impacts the lives of people with *** detection of epileptic seizures(ES)has dramatically improved the life quality of the *** Electroencephalogram(EEG)related seizure detection mechanisms encountered several difficulties in *** EEGs are the non-stationary signal,and seizure patternswould changewith patients and recording ***,EEG data were disposed to wide noise varieties that adversely moved the recognition accuracy of *** intelligence(AI)methods in the domain of ES analysis use traditional deep learning(DL),and machine learning(ML)*** article introduces an Oppositional Aquila Optimizer-based Feature Selection with Deep Belief Network for Epileptic Seizure Detection(OAOFS-DBNECD)technique using EEG *** primary aim of the presented OAOFS-DBNECD system is to categorize and classify the presence of *** suggested OAOFS-DBNECD technique transforms the EEG signals *** format at the initial ***,the OAOFS technique selects an optimal subset of features using the preprocessed *** seizure classification,the presented OAOFS-DBNECD technique applies Artificial Ecosystem Optimizer(AEO)with a deep belief network(DBN)*** extensive range of simulations was performed on the benchmark dataset to ensure the enhanced performance of the presented OAOFS-DBNECD *** comparison study shows the significant outcomes of the OAOFS-DBNECD approach over other *** addition,the result of the suggested approach has been evaluated using the CHB-MIT database,and the findings demonstrate accuracy of 97.81%.These findings confirmed the best seizure categorization accuracy on the EEG data considered.

关键词： Seizure detection EEG signals machine learning deep learning feature selection

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

NO_(X) abatement from filtered diesel engine exhaust using battery-powered high-voltage pulse power supply

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2017年第2期2卷 69-77页

作者： Sankarsan Mohapatro srikanth Allamsetty DEI Laboratory School of Electrical SciencesIndian Institute of Technology BhubaneswarJatniIndia

The dielectric barrier discharge-based non-thermal plasma technique is one of the most prominent techniques which give peerless results in controlling the concentration of NO_(X).However,when it comes to the automobile diesel engine,availability of high-voltage pulse power supply is the major *** this study,battery-powered high-voltage pulse power supply for NO_(X) treatment has been *** types of electrodes:rod type and rod with helical spring type are studied for the treatment of *** plasma-adsorbent technique has also been used to enhance NO_(X) removal *** have been conducted with two different gas flow rates,i.e.4 l and 6 l/min at laboratory level and have got significant results toward removal of NO_(X).When the exhaust has been treated with plasma alone,the reactor with rod-type electrode has shown 85%NO_(X) removal efficiency at a specific energy(SE)of 283 J/l with a flow rate of 4 l/*** the plasma reactor is cascaded with the adsorbent reactor,both adsorbents:13x molecular sieve(MS13x)and activated alumina are able to remove 100%of NO_(X) with the proposed power supply at a lesser SE.

关键词： adsorbent filtered remove

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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