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A review of stress concentration factors in tubular and non-tubular joints for design of offshore installations

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Journal of Ocean Engineering and Science 2016年第3期1卷 186-202页

作者： Dikshant Singh Saini Debasis Karmakar samit ray-Chaudhuri Department of Civil Engineering Indian Institute of Technology KanpurKanpurUP 208016India

Tubular structures are widely used in offshore installations,trusses,high rise buildings,towers for wind turbines,ski-lift installations,lightning,road pole signals etc.,owing to their excellent structural performance and attractive *** concentration,especially in the welded joints of these structures,is an important design consideration particularly for fatigue *** the context of tubular and non-tubular joints,this paper provides a review of the experimental and numerical studies that have been carried out so far to determine the stress concentration factor(SCF).Emphasis is also placed on the complexity of capturing different types of stresses in tubular/non-tubular joints for estimation of *** code provisions for evaluation of SCF are also ***,a few issues,which require significant research effort to advance our understanding and to improve the current design guidelines,have been identified.©2016 Shanghai Jiaotong *** by Elsevier B.V.

关键词： Hot-spot stress Stress concentration factor(SCF) Fatigue Tubular joints Non-tubular joints

In vitro and in vivo degradability,biocompatibility and antimicrobial characteristics of Cu added iron-manganese alloy

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Journal of Materials Science & Technology 2021年第25期84卷 159-172页

作者： Santanu Mandal Vijay Kishore Madhuparna Bose samit kumar Nandi Mangal Ro Department of Metallurgical and Materials Engineering Indian Institute of Technology-KharagpurKharagpur 721302India Department of Veterinary Surgery&Radiology West Bengal University of Animal&Fishery SciencesKolkata 700037India Department of Biotechnology Indian Institute of TechnologyKharagpur 721302India

In recent years,iron(Fe)based degradable metal is explored as an alternative to permanent fracture fixation *** the present work,copper(Cu)is added in Fe-Mn system to enhance the degradation rate and antimicrobial ***-Mn-x Cu(x=0.9,5 and 10 wt.%)alloys are prepared by the meltingcasting-forging *** analysis confirms austenite phase stabilization due to the presence of Mn and *** predicted by Thermo-Calc calculations,Cu rich phase precipitations are noticed along the austenite grain *** behaviours of Cu added Fe-Mn alloys are investigated through static immersion and electrochemical polarization where enhanced degradation is found for higher Cu added *** challenged against *** bacteria,the Fe-Mn-Cu alloy media extract shows a significant bactericidal effect compare to the base *** vitro cytocompatibility studies,as determined using MG63 and MC3T3-E1 cell lines,indicate increased cell density as a function of time for all the *** implanted in rabbit femur,the newly developed alloy does not show any kind of tissue necrosis around the *** osteogenesis and higher new bone formation are observed with Fe-Mn-10 Cu alloy as evident from micro-computed tomography(μ-CT)and fluorochrome labelling.

关键词： Iron-manganese alloy Degradable metal In vitro Micro-CT

Pattern classification using fuzzy relation and genetic algorithm

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International Journal of Intelligent Computing and Cybernetics 2012年第4期5卷 533-565页

作者： kumar S.ray Electronics and Communication Sciences Unit Indian Statistical InstituteKolkataIndia

Purpose–This paper aims to consider a soft computing approach to pattern classification using the basic tools of fuzzy relational calculus(FRC)and genetic algorithm(GA).Design/methodology/approach–The paper introduces a new interpretation of multidimensional fuzzy implication(MFI)to represent the author’s knowledge about the training data *** also considers the notion of a fuzzy pattern vector(FPV)to handle the fuzzy information granules of the quantized pattern space and to represent a population of training patterns in the quantized pattern *** construction of the pattern classifier is essentially based on the estimate of a fuzzy relation Ri between the antecedent clause and consequent clause of each one-dimensional fuzzy *** the estimation of Ri floating point representation of GA is ***,a set of fuzzy relations is formed from the new interpretation of *** set of fuzzy relations is termed as the core of the pattern *** the classifier is constructed the non-fuzzy features of a test pattern can be ***–The performance of the proposed scheme is tested on synthetic ***,the paper uses the proposed scheme for the vowel classification problem of an Indian *** all these case studies the recognition score of the proposed method is very ***,a benchmark of performance is established by considering Multilayer Perceptron(MLP),Support Vector Machine(SVM)and the proposed *** Abalone,Hosse colic and Pima Indians data sets,obtained from UCL database repository are used for the said benchmark *** benchmark study also establishes the superiority of the proposed ***/value–This new soft computing approach to pattern classification is based on a new interpretation of MFI and a novel notion of FPV.A set of fuzzy relations which is the core of the pattern classifier,is estimated using floating point GA and very effective classification of patterns under vague and impreci

关键词： Pattern classifier Multidimensional fuzzy implication Fuzzy information granule Fuzzy patter vector Fuzzy relational calculus Genetic algorithms Fuzzy logic Pattern recognition

A Novel Cascaded PID Controller for Automatic Generation Control Analysis With Renewable Sources

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IEEE/CAA Journal of Automatica Sinica 2019年第6期6卷 1438-1451页

作者： Aurobindo Behera Tapas kumar Panigrahi PrakashK·ray Arun kumar Sahoo Department of Electrical and Electronics Engineering International Institute of Information Technology BhubaneswarBhubaneswar 751003India Department of Electrical Engineering Parala Maharaja Engineering CollegeBiju Patnaik University of TechnologyRourkela 769015India Department of Electrical Engineering College of Engineering and TechnologyBiju Patnaik University of TechnologyRourkela 769015India

Present day power scenarios demand a high quality uninterrupted power supply and needs environmental issues to be addressed. Both concerns can be dealt with by the introduction of the renewable sources to the existing power system. Thus, automatic generation control(AGC) with diverse renewable sources and a modified-cascaded controller are presented in the ***, a new hybrid scheme of the improved teaching learning based optimization-differential evolution(hITLBO-DE) algorithm is applied for providing optimization of controller parameters. A study of the system with a technique such as TLBO applied to a proportional integral derivative(PID), integral double derivative(IDD) and PIDD is compared to hITLBO-DE tuned cascaded controller with dynamic load *** suggested methodology has been extensively applied to a 2-area system with a diverse source power system with various operation time non-linearities such as dead-band of, generation rate constraint and reheat thermal units. The multi-area system with reheat thermal plants, hydel plants and a unit of a wind-diesel combination is tested with the cascaded controller scheme with a different controller setting for each area. The variation of the load is taken within 1% to 5% of the connected load and robustness analysis is shown by modifying essential factors simultaneously by± 30%. Finally, the proposed scheme of controller and optimization technique is also tested with a 5-equal area thermal system with non-linearities. The simulation results demonstrate the superiority of the proposed controller and algorithm under a dynamically changing load.

关键词： Automatic generation control(AGC) cascaded controller hybrid improved teaching learning based optimization-differential evolution(hITLBO-DE) algorithm integral of square time multiplied by square error(ISTSE)

Synergism of co-delivered nanosized antioxidants displayed enhanced anticancer efficacy in human colon cancer cell lines

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Bioactive Materials 2017年第2期2卷 82-95页

作者： Lipika ray Manish kumar Pal Ratan Singh ray CSIR-Indian Institute of Toxicology Research P.O.Box No.80M.G.MargLucknowUP226001India Academy of Scientific and Innovative Research New Delhi 110001India

Combination of chemopreventive and/or therapeutic agents is the imminent smart approach to cope upwith cancer because it may act on multiple targets through different pathways. In the present study, wehave synthesized multiple chemopreventive and/or therapeutic agents (Curcumin, Quercetin andAspirin) loaded nanoparticles by simple cation-anion interaction among the amine groups of chitosan(CS) and phosphate groups of sodium hexametaphosphate (SHMP). These nanosized bioactive materials(CS-SHMP-CQA-NPs) were well characterized and found most effective in colon cancer cell line (HCT-116)compared to other cancer cell lines. Triplex chemopreventive and/or therapeutic agents-loaded NPs weresynergistically inducing apoptosis in HCT-116 cells compared to two-chemopreventive agents-loadedNPs as evident by an increase in sub-G1 cells (percent), and chromatin condensation along with thedecrease in mitochondrial membrane potential (MMP). Interestingly, ChoueTalalay analysis revealedthat CS-SHMP-CQA-NPs showed strong synergistic effect in its all doses. Thus, our study demonstratesthat nanoparticles based bioactive materials significantly inhibit the growth of HCT-116 cells and thuscould be a promising approach for colon cancer chemoprevention.

关键词： Chemoprevention Therapeutic agent Colon cancer Synergistic effect Apoptosis

Wavelet Synchro-squeezing Transform and Dynamic Threshold Supported Symmetrical Power Swing Technique for Modern Transmission Network

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Chinese Journal of Electrical Engineering 2024年第2期10卷 30-43页

作者： Monalisa Biswal kumar Raja Andanapalli Papia ray Department of Electrical Engineering National Institute of Technology RaipurChhattisgarh 492010India Department of Electrical Engineering Veer Surendra Sai University of TechnologyBurla Sambalpur 768018India

Distance relays are prone to symmetrical power swing *** mitigate this issue,a dynamic threshold-supported algorithm is proposed.A single logic is not supposed to be secure for all ***,a supervisory algorithm,as proposed in this study,can aid in the improvement of the immunity of the relay during swing cases and be sensitive to symmetrical *** the developed stages,a three-phase power signal was used and processed in two different steps:(i)extraction of the effective intrinsic mode function(IMF)selected from the Kurtosis analysis using the wavelet synchro-squeezing transform,and(ii)estimation of the average Euclidean distance index using the absolute values of the decomposed IMF’*** adaptive threshold facilitated resistance to swing *** the onset of a symmetrical fault,the proposed algorithm efficiently discriminated among events using a dynamic *** IEEE 39-bus test system and Indian Eastern Power Grid networks were modelled using PSCAD software,and cases were generated to test the efficacy of the *** impact of the proposed method on a large-scale wind farm was also evaluated.A comparative analysis with other existing methods revealed the security and dependability of the proposed method.

关键词： Distance relays symmetrical power swing wind farm wavelet synchro-squeezing transform(WSST) Euclidean distance

Artificial neural network-based merging score for Meta search engine

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Journal of Central South University 2016年第10期23卷 2604-2615页

作者： P.Vijaya G.Raju Santosh kumar ray Karpagam University Coimbatore TamilNadu India Faculty of Engineering and Technology Associate Professor Department of Information Technology Kannur University Kannur Kerala-670 567 India Department of Information Technology Al Khawarizmi International College Al Alin UAE

Several users use metasearch engines directly or indirectly to access and gather data from more than one data sources. The effectiveness of a metasearch engine is majorly determined by the quality of the results and it returns and in response to user queries. The rank aggregation methods which have been proposed until now exploits very limited set of parameters such as total number of used resources and the rankings they achieved from each individual resource. In this work, we use the neural network to merge the score computation module effectively. Initially, we give a query to different search engines and the top n list from each search engine is chosen for further processing our technique. We then merge the top n list based on unique links and we do some parameter calculations such as title based calculation, snippet based calculation, content based calculation, domain calculation, position calculation and co-occurrence calculation. We give the solutions of the calculations with user given ranking of links to the neural network to train the system. The system then rank and merge the links we obtain from different search engines for the query we give. Experimentation results reports a retrieval effectiveness of about 80%, precision of about 79% for user queries and about 72% for benchmark queries. The proposed technique also includes a response time of about 76 ms for 50 links and 144 ms for 100 links.

关键词： metasearch engine neural network retrieval of documents ranking list

Review of preventive and constructive measures for coal mine explosions:An Indian perspective

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International Journal of Mining Science and Technology 2022年第3期32卷 471-485页

作者： Santosh kumar ray Asfar Mobin Khan Niroj kumar Mohalik Debashish Mishra Somu Mandal Jai Krishna Pandey CSIR-Central Institute of Mining and Fuel Research Barwa RoadDhanbad 826015India Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India

Firedamp and coal dust explosion constitute a lion’s share in mine accidents in a global mining *** paper reports a list of mine explosion disasters since last two decades,a critical review of the different prevention and constructive measures,and its recent development to avoid firedamp and coal dust *** legislation in core coal-producing countries,***,USA,Australia,South Africa,and India related to firedamp and coal dust explosion are critically *** occurred due to explosion after Nationalisation of Coal Mines(1973)in India are *** and constructive measures adopted in India are critically analysed with respect to the global mining *** like methane credit concept,classification of mines/seams with respect to explosion risk zone,deflagration index;installation of automatic fire warning devices,canopy air curtain technology,explosion-prevention measures,such as fire-retardant materials,inhibitors,extinguishing agent,dust suppressor,and active explosion barrier are discussed in detail to avoid explosion and thereby adhering to zero accident policy due to coal mine explosion.

关键词： Firedamp explosion Coal dust explosion Preventive measures Constructive measures Legislation

Splicing operation and fuzzy molecular automaton

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International Journal of Intelligent Computing and Cybernetics 2012年第2期5卷 206-225页

作者： kumar S.ray Mandrita Mondal Electronics and Communication Sciences Unit Indian Statistical InstituteKolkataIndia

Purpose–The purpose of this study is to develop a Turing machine or a finite automaton,which scans the input data tape in the form of DNA sequences and inspires the basic design of a DNA ***/methodology/approach–This model based on a splicing system can solve fuzzy reasoning autonomously by using DNA sequences and human assisted *** hardware consists of class IIS restriction enzyme and T4 DNA ligase while the software consists of double stranded DNA sequences and transition molecules which are capable of encoding fuzzy *** mixing solutions containing these components,the automaton undergoes a cascade of cleaving and splicing cycles to produce the computational result in form of double stranded DNA sequence representing automaton’s final ***–In this work,the authors have fused the idea of a splicing system with the automata theory to develop fuzzy molecular automaton in which 1,018 processors can work in parallel,requiring a trillion times less space for information storage,is 105 times faster than the existing super computer and 1,019 power operations can be performed using one Joule of ***/value–This paper presents a generalized model for biologically inspired computation in nano scale.

关键词： Splicing operation Automaton Turing