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Micro-synchrophasor based special protection scheme for distribution system automation in a smart city

Protection and Control of Modern Power systems 2020年第1期5卷 97-110页

作者： deepa s.kumar savier J.s Biju s.s Dept of Electrical Engineering College of EngineeringTrivandrumKeralaIndia 400/220kV substation Powergrid Corporation of India Ltd.TrivandrumKeralaIndia Power system Operations Kerala State Electricity Board Ltd.KeralaIndia

Introduction:Aspects of power system protection which contributes to mal-operations and blackouts can be improved by supervision of system behavior and response based analysis rather than condition-based or event-based analysis using wide area measurements based on synchrophasor *** paper explores the application of micro-Phasor Measurement Unit for time synchronized real-time distribution network monitoring and agile decision support schemes for system prognosis and *** description:The scheme is proposed as part of a project on“Power system Voltage stability Analysis using synchrophasors in Distribution system of Kerala Grid”at Kerala state Electricity Board *** actual grid occurrence during the severe tropical cyclone Ockhi,is considered as the base case which motivated the *** and evaluation:A voltage stability index(VsI)based special protection scheme(sPs)for radial distribution network at a proposed smart city is presented in the present *** proposed special protection scheme on actual implementation can use data from proposed local micro-Phasor Measurement *** PMU is proposed to be placed at one of the key nodes of the distribution system network in the ***:The VsI is derived using local phasor values and is used to initiate a special Protection scheme for N-1 contingency at the key node,so as to ensure availability of the most essential feeder which provides supply to a hospital campus housing several health institutes of prime *** voltage stability index derived is tested and sPs is validated using real-time grid data.

关键词： Micro-phasor measurement unit Power system protection Voltage stability Power system stability Power distribution smart grids

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Translocator protein and neurodegeneration: insights from Alzheimer’s disease

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Neural Regeneration Research 2025年第4期20卷 1090-1091页

作者： Arpit kumar Pradhan Rainer Rupprecht Gerhard Rammes Klinik für Anaesthesiologie und Intensivmedizin der Technischen Universität München Klinikum rechts der IsarMunichGermany Graduate school of systemic Neurosciences Ludwig-Maximilians-Universität MünchenMartinsriedGermany Department of Psychiatry and Psychotherapy University RegensburgRegensburgGermany

The 18 kDa translocator protein(TsPO)located on the outer mitochondrial membrane regulates several key cellular processes including mitochondrial homeostasis,cholesterol transport,apoptosis,cell proliferation,and maintenance of mitochondrial health(Rupprecht et al.,2022,2023).TsPO is expressed in both peripheral organs and the central nervous system,with a more pronounced expression in tissues that produce *** main reason why TsPO has garnered so much attention is because it plays a key role in neurosteroidogenesis by transferring cholesterol from the outer to the inner mitochondrial membrane,which is the rate-limiting step in neurosteroid synthesis.A cholesterol-recognizing amino acid consensus domain has been identified in the cytosolic C terminus of the TsPO protein by both in vitro and site-directed mutagenesis experiments(Li et al.,2001).However,the role of TsPO in the process of neurosteroid synthesis has been challenged by several studies,particularly TsPO knockout models,which suggest that TsPO removal does not affect the phenotype or the system’s viability(Tu et al.,2014).However,ligands targeting TsPO have been shown to enhance levels of neurosteroids which suggests that neurosteroidogenesis is one of the major functional roles mediated by the TsPO protein.

关键词： cholesterol organs

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Research highlights from the status report for step it up! The surgeon general's call to action to promote walking and walkable communities

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Journal of sport and Health science 2018年第1期7卷 5-6页

作者： David R.Brown susan A.Carlson Gayathri s.kumar Janet E.Fulton National Center for Chronic Disease Prevention and Health Promotion Centers for Disease Control and Prevention Division of NutritionPhysical Activity and Obesity Physical Activity and Health Branch

In september 2015,the Office of the surgeon General,*** of Health and Human services,released step it up!The surgeon general’s call to action to promote walking and walkable communities(Call to Action)to increase walking among people across the UsA.1The Call to Action also recognized that walkable communities can accommodate wheelchair rolling and are inclusive of persons with *** status Report for the Call to Action was released in 2017。

关键词：电话医生外科社区办公室

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Evolution of PEO coatings on AM50 magnesium alloy using phosphate-based electrolyte with and without glycerol and its electrochemical characterization

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Journal of Magnesium and Alloys 2020年第3期8卷 692-715页

作者： Ashutosh Jangde s.kumar C.Blawert Department of Materials Engineering Indian Institute of ScienceBangalore 560012India Institute of Materials Research Helmholtz-Zentrum GeesthachtMax-Planck-Str.121502 GeesthachtGermany

PEO coatings were synthesized from phosphate-based (bP-PEO) and glycerol added phosphate-based (gP-PEO) electrolytes with differentprocessing times. For both bP-PEO and gP-PEO coatings treated with different processing time its morphology, elemental and phase composition,and electrochemical behaviour has been comparatively investigated. For this, scanning electron microscope (sEM), energy-dispersiveX-ray spectroscopy (EDXs), X-ray diffraction, electrochemical impedance spectroscopy (EIs), and potentiodynamic polarization techniqueswere employed. The gP-PEO coatings were observed to have higher pore density with reduced pores size, surface porosity, and averagecoating thickness compared to bP-PEO for all the PEO processing time. XRD studies revealed that glycerol addition resulted in the fosteringof crystalline MgO (periclase) phase and promoting Mg3(PO4)2 (farringtonite) phase amorphization. In general, electrochemical behaviourshowed improved corrosion behaviour for gP-PEO compared to bP-PEO.

关键词： Magnesium alloy Plasma electrolytic oxidation Glycerol additive Electrochemical impedance spectroscopy Corrosion.

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Multifunctional characteristics of 3D printed polymer nanocomposites under monotonic and cyclic compression

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Defence Technology（防务技术） 2023年第12期30卷 13-22页

作者： Pawan Verma Jabir Ubaid Fahad Alam suleyman Deveci s.kumar Department of Mechanical Engineering Khalifa University of Science and TechnologyMasdar InstituteMasdar CityP.O.Box 54224Abu DhabiUnited Arab Emirates Borouge Pte.Ltd. Innovation CentreSas Al Nakhl6951Abu DhabiUnited Arab Emirates James Watt school of Engineering University of GlasgowGlasgowG128QQUK

This study presents the multifunctional characteristics of multi-walled carbon nanotube(MWCNT)/polypropylene random copolymer(PPR) composites enabled via fused filament fabrication(FFF) under monotonic and quasi-static cyclic compression. Utilizing in-house MWCNT-engineered PPR filament feedstocks, both bulk and cellular composites were realized. The morphological features of nanocomposites were examined via scanning electron microscopy, which reveals that MWCNTs are uniformly dispersed. The uniformly dispersed MWCNTs forms an electrically conductive network within the PPR matrix, and the resulting nanocomposite shows good electrical conductivity(~10^(-1)s/cm), improved mechanical performance(modulus increases by 125% and compressive strength increases by 25% for 8 wt% MWCNT loading) and pronounced piezoresistive response(gauge factor of 27.9-8.5 for bulk samples)under compression. The influence of strain rate on the piezoresistive response of bulk samples(4 wt% of MWCNT) under compression was also measured. Under repeated cyclic compression(2% constant strain amplitude), the nanocomposite exhibited stable piezoresistive performance up to 100 cycles. The piezoresistive response under repeated cyclic loading with increasing strain amplitude of was also *** gauge factor of BCC and FCC cellular composites(4 wt% of MWCNT) with a relative density of 30%was observed to be 46.4 and 30.2 respectively, under compression. The higher sensitivity of the BCC plate-lattice could be attributed to its higher degree of stretching-dominated deformation behavior than the FCC plate-lattice, which exhibits bending-dominated behavior. The 3D printed cellular PPR/MWCNT composites structures were found to show excellent piezoresistive self-sensing characteristics and open new avenues for in situ structural health monitoring in various applications.

关键词： Carbon nanotubes Nanoengineered polymer composites 3D printing Piezoresistive self-sensing Lattice structures

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Preparation and bioactivity of siO_2 functional films on titanium by PACVD

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中国有色金属学会会刊：英文版 2008年第3期18卷 627-630页

作者：程晓敏聂邦民 s.kumar school of Materials science and Engineering Wuhan University of Technology Ian Wark Research Institute University of South AustraliaNorth Terrace

siO2 functional films were deposited on the surface of titanium by plasma assisted chemical vapour deposition(PACVD) and the composition of films was studied by XPs. samples deposited with siO2 films were immersed in different concentration simulated body fluid(sBF) for biomimetic deposition of hydroxyapatite(HA). The results show that siO2 functional films deposited on titanium surface with PACVD have good bioactivity. Hydroxyapatite is formed while titanium coated with siO2 is immersed in simulated body fluid for seven days.

关键词：钛二氧化硅薄膜生物活性化学蒸汽沉积

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Optimal Feature Extraction Using Greedy Approach for Random Image Components and subspace Approach in Face Recognition

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Journal of Computer science & Technology 2013年第2期28卷 322-328页

作者： Mathu soothana s.kumar Retna swami Muneeswaran Karuppiah Department of Information Technology Noorul Islam University Department of Computer science and Engineering Mepco Schlenk Engineering College

An innovative and uniform framework based on a combination of Gabor wavelets with principal component analysis （PCA） and multiple discriminant analysis （MDA） is presented in this paper. In this framework, features are extracted from the optimal random image components using greedy approach. These feature vectors are then projected to subspaces for dimensionality reduction which is used for solving linear problems. The design of Gabor filters, PCA and MDA are crucial processes used for facial feature extraction. The FERET, ORL and YALE face databases are used to generate the results. Experiments show that optimal random image component selection （ORICs） plus MDA outperforms ORICs and subspace projection approach such as ORICs plus PCA. Our method achieves 96.25%, 99.44% and 100% recognition accuracy on the FERET, ORL and YALE databases for 30% training respectively. This is a considerably improved performance compared with other standard methodologies described in the literature.

关键词： face recognition multiple discriminant analysis optimal random image component selection principal com- ponent analysis recognition accuracy

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Evolutionary Algorithm Based Feature subset selection for students Academic Performance Analysis

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Intelligent Automation & soft Computing 2023年第6期36卷 3621-3636页

作者： Ierin Babu R.Mathusoothana s.kumar Department of Computer science and Engineering Noorul Islam Centre for Higher EducationKanyakumari629180India Department of Information Technology Noorul Islam Centre for Higher EducationKanyakumari629180India

Educational Data Mining(EDM)is an emergent discipline that concen-trates on the design of self-learning and adaptive *** education institutions have started to utilize analytical tools to improve students’grades and *** of students’performance is a difficult process owing to the massive quantity of educational ***,Artificial Intelligence(AI)techniques can be used for educational data mining in a big data *** the same time,in EDM,the feature selection process becomes necessary in creation of feature *** the feature selection performance affects the predictive performance of any model,it is important to elaborately investigate the outcome of students’performance model related to the feature selection *** this motivation,this paper presents a new Metaheuristic Optimiza-tion-based Feature subset selection with an Optimal Deep Learning model(MOFss-ODL)for predicting students’*** addition,the proposed model uses an isolation forest-based outlier detection approach to eliminate the existence of ***,the Chaotic Monarch Butterfly Optimization Algo-rithm(CBOA)is used for the selection of highly related features with low com-plexity and high ***,a sailfish optimizer with stacked sparse autoencoder(sFO-ssAE)approach is utilized for the classification of educational *** MOFss-ODL model is tested against a benchmark student’s perfor-mance data set from the UCI repository.A wide-ranging simulation analysis por-trayed the improved predictive performance of the MOFss-ODL technique over recent approaches in terms of different *** to other methods,experimental results prove that the proposed(MOFss-ODL)classification model does a great job of predicting students’academic progress,with an accuracy of 96.49%.

关键词： students’performance analysis educational data mining feature selection deep learning metaheuristics outlier detection

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Numerical and analytical investigations of thermosolutal instability in rotating Rivlin-Ericksen fluid in porous medium with Hall current

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Applied Mathematics and Mechanics(English Edition) 2013年第4期34卷 501-522页

作者： s.kumar V.sHARMA K.KIsHOR Department of Mathematics Government College Department of Mathematics Himachal Pradesh University Department of Mathematics Government Senior Secondary School

Numerical and analytical investigations of the thermosolutal instability in a viscoelastic Rivlin-Ericksen fluid are carried out in the presence of a uniform vertical magnetic field to include the Hall current with a uniform angular velocity in a porous medium. For stationary convection, the stable solute gradient parameter and the rota- tion have stabilizing effects on the system, whereas the magnetic field and the medium permeability have stabilizing or destabilizing effects on the system under certain condi- tions. The Hall current in the presence of rotation has stabilizing effects for sufficiently large Taylor numbers, whereas in the absence of rotation, the Hall current always has destabilizing effects. These effects have also been shown graphically. The viscoelastic effects disappear for stationary convection. The stable solute parameter, the rotation, the medium permeability, the magnetic field parameter, the Hall current, and the vis- coelasticity introduce oscillatory modes into the system, which are non-existent in their absence. The sufficient conditions for the non-existence of overstability are also obtained.

关键词： magnetic field thermosolutal instability Rivlin-Ericksen rotating fluid Hall current porous medium

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Transient photoconductivity in a-(se80Te20)100-xAgx（0≤x≤4） thin films

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Progress in Natural science:Materials International 2012年第5期22卷 386-391页

作者： D.singh s.kumar R.Thangaraj semiconductors Laboratory Department of PhysicsGuru Nanak Dev UniversityAmritsarPunjab 143005India

Bulk material of(se80Te20)100-xAgx(0≤x≤4) system was prepared by using a conventional melt quenching *** films of a-(se80Te20)100-xAgx(0≤x≤4) were deposited by the vacuum evaporation technique at a base pressure of 10-4 mbar onto well-cleaned glass *** dependence of electrical conductivity in the temperature range of 263-333 K has been *** is increase in the value of conductivity with increase in temperature as well as with Ag *** measurements of intensity dependence of photoconductivity show that the photoconductivity increases with intensity as a power law where the power is found to be between 0.5 and 1.0,representing the continuous distribution of *** and decay of photocurrent with time at room temperature at different light intensities for(se80Te20)98Ag2 thin film samples have also been *** results have been explained on the basis of the Dember voltage and interaction between photoexcited holes and the trapped electrons on the surface.

关键词： Chalcogenides se-Te-Ag system Transient photoconductivity

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