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Application of a probabilistic LHS-PAWN approach to assess building cooling energy demand uncertainties

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Building Simulation 2022年第3期15卷 373-387页

作者： Shobhit Chaturvedi Elangovan rajasekar Department of Architecture and Planning Indian Institute of TechnologyRoorkeeIndia

A deterministic approach to building energy simulation risks the omission of real-world uncertainties leading to prediction *** paper highlights limitations of this approach by contrasting it with a probabilistic uncertainty/sensitivity simulation *** hypercube sampling(LHS)generates 15000 unique model configurations to assess the effects of weather,physical and operational uncertainties on the annual and peak cooling energy demands for a residential building which situated in a hot and dry climatic *** simulations predicted 0.22–2.17 and 0.45–1.62 times variation in annual and peak cooling energy demands,respectively,compared to deterministic simulation.A novel density-based global sensitivity analysis(SA),i.e.,PAWN,is adopted to identify dominant input *** traditional SA methods,PAWN allows simultaneous treatment of continuous and categorical inputs from a generic input-output *** is favourable when computational resources are limited and model outputs are skewed or *** annual and peak cooling demands,the effects of weather and operational parameters associated with airconditioner and window operation are much stronger than these of other parameters ***,these parameters warrant greater attention during modelling and simulation *** and convergence analysis also confirm the validity of these results.

关键词： building energy code(BEC) cooling energy demand uncertainty analysis PAWN sensitivity analysis

Cold metal transfer(CMT) technology-An overview

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Defence Technology（防务技术） 2018年第1期14卷 28-44页

作者： S.Selvi A.Vishvaksenan E.rajasekar Mechanical Engineering Institute of Road and Transport Technology Automobile Engineering Institute of Road and Transport Technology

Cold Metal Transfer technology has revolutionized the welding of dissimilar metals and thicker materials by producing improved weld bead aesthetics with controlled metal deposition and low heat-input. In this study, the process, weld combinations, laser-CMT hybrid welding and applications of CMT welding are critically reviewed. Microstructure and other weld characteristics have been discussed at length for various base metal combinations. Particularly, the welding of aluminium and steel with better results has been possible with CMT Welding. The results reviewed in this article indicate that the CMT-Laser hybrid welding is more preferable to Laser or Laser hybrid welding. CMT welding has found applications in automobile industries, defence sectors and power plants as a method of additive manufacturing.

关键词： Cold metal transfer [CMT]Welding Laser-CMT welding Additive manufacturing Composite joint Metal inert gas[MIG] Metal active gas[MAG]

A spatio-temporal assessment and prediction of Ahmedabad's urban growth between 1990–2030

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Journal of Geographical Sciences 2022年第9期32卷 1791-1812页

作者： Shobhit CHATURVEDI Kunjan SHUKLA Elangovan rajasekar Naimish BHATT Department of Architecture and Planning Indian Institute of TechnologyRoorkee247667India Department of Civil Engineering School of TechnologyPandit Deendayal Petroleum UniversityGandhinagar382007India

Analyzing long term urban growth trends can provide valuable insights into a city’s future *** study employs LANDSAT satellite images from 1990,2000,2010 and 2019 to perform a spatiotemporal assessment and predict Ahmedabad’s urban *** Use Land Change(LULC)maps developed using the Maximum Likelihood classifier produce four principal classes:Built-up,Vegetation,Water body,and“Others”.In between 1990-2019,the total built-up area expanded by 130%,132 km^(2) in 1990 to 305 km^(2) in *** population growth is the chief contributor towards urban growth as the city added 3.9 km^(2) of additional built-up area to accommodate every 100,000 new ***,a Multi-Layer Perceptron-Markov Chain model(MLP-MC)predicts Ahmedabad’s urban expansion by *** to 2019,the MLP-MC model predicts a 25%and 19%increase in Ahmedabad’s total urban area and population by ***,these trends shall generate many socio-economic and environmental ***,future urban development policies must balance further development and environmental damage.

关键词： land use land cover urbanization maximum likelihood classification multi-layer perceptron–Markov chain model

PROBING A STOCHASTIC EPIDEMIC HEPATITIS C VIRUS MODEL WITH A CHRONICALLY INFECTED TREATED POPULATION

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Acta Mathematica Scientia 2022年第5期42卷 2087-2112页

作者： S.P.rajasekar M.PITCHAIMANI Quanxin ZHU Ramanujan Institute for Advanced Study in Mathematics Universityof MadrasChennai-600005Tamil NaduIndia Department of Mathematics Government Arts College for WomenNilakottai-624202Tamil NaduIndia CHP-LCOCS School of Mathematics and StatisticsHunan Normal UniversityChangsha 410081China

The hepatitis C virus is hitherto a tremendous threat to human beings,but many researchers have analyzed mathematical models for hepatitis C virus transmission dynamics only in the deterministic *** plays an immense role in pathology and ***,the main theme of this article is to investigate a stochastic epidemic hepatitis C virus model with five states of epidemiological classification:susceptible,acutely infected,chronically infected,recovered or removed and chronically infected,and *** stochastic hepatitis C virus model in epidemiology is established based on the environmental influence on individuals,is manifested by stochastic perturbations,and is proportional to each *** assert that the stochastic HCV model has a unique global positive solution and attains sufficient conditions for the extinction of the hepatotropic RNA ***,by constructing a suitable Lyapunov function,we obtain sufficient conditions for the existence of an ergodic stationary distribution of the solutions to the stochastic HCV ***,this article confirms that using numerical simulations,the six parameters of the stochastic HCV model can have a high impact over the disease transmission dynamics,specifically the disease transmission rate,the rate of chronically infected population,the rate of progression to chronic infection,the treatment failure rate of chronically infected population,the recovery rate from chronic infection and the treatment rate of the chronically infected ***,numerical simulations validate the effectiveness of our theoretical conclusions.

关键词： infeted chroniclly infeted treated hepatitis Cextinction stationary distributior

Larvicidal and repellent activity of tetradecanoic acid against Aedes aegypti(Linn.) and Culex quinquejasciatus(Say.)(Diptera:Culicidae)

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Asian Pacific Journal of Tropical Medicine 2011年第9期4卷 706-710页

作者： Sivakumar R Jebanesan A Govindarajan M rajasekar P Division of Vector Biology Department of Zoology.Annamalai University.Annamalainagar-608 002.Tamil NaduIndia

Objective:To investigate the larvicidal and repellent efficacy of tetradecanoic acid against Aedes aegrpti（***） L,and Culex quinquefasciatus（***） Say（Diptera: Culicidae）.Methods:Larvicidal efficacy of tetradecanoic acid was tested at various concentrations against the early third instar larvae of *** and ***. The repellent activity was determined against two mosquito species at three concentrations viz..1.***.2.5 and 5.0 ppm under the laboratory ***:The tetradecanoic acid was found to be more effective against *** than *** *** LC50 values were 14.08 ppm and 25.10 ppm,*** acid showed lesser repellency against *** and *** highest repellency was observed in higher concentration of 5.0 mg/cm2 provided 100%protection up to 60 and 90 min against *** and *** ***:From the results it can be concluded the tetradecanoic acid is a potential for controlling *** and *** mosquitoes.

关键词： Tetradecanoic acid Larvicidal activity Repellent activity Aedes aegypti Culex quinquefasciatus

Falcon Optimization Algorithm-Based Energy Efficient Communication Protocol for Cluster-Based Vehicular Networks

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Computers, Materials & Continua 2024年第3期78卷 4243-4262页

作者： Youseef Alotaibi B.rajasekar R.Jayalakshmi Surendran Rajendran Department of Software Engineering College of ComputingUmm Al-Qura UniversityMakkah21955Saudi Arabia Department of Electronics and Communication Engineering Sathyabama Institute of Science and TechnologyChennai600119India Department of Computer Science and Engineering Panimalar Engineering CollegeChennai600123India Department of Computer Science and Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical ScienceChennai602105India

Rapid development in Information Technology(IT)has allowed several novel application regions like large outdoor vehicular networks for Vehicle-to-Vehicle(V2V)*** networks give a safe and more effective driving experience by presenting time-sensitive and location-aware *** communication occurs directly between V2V and Base Station(BS)units such as the Road Side Unit(RSU),named as a Vehicle to Infrastructure(V2I).However,the frequent topology alterations in VANETs generate several problems with data transmission as the vehicle velocity differs with ***,the scheme of an effectual routing protocol for reliable and stable communications is *** research demonstrates that clustering is an intelligent method for effectual routing in a mobile ***,this article presents a Falcon Optimization Algorithm-based Energy Efficient Communication Protocol for Cluster-based Routing(FOA-EECPCR)technique in *** FOA-EECPCR technique intends to group the vehicles and determine the shortest route in the *** accomplish this,the FOA-EECPCR technique initially clusters the vehicles using FOA with fitness functions comprising energy,distance,and trust *** the routing process,the Sparrow Search Algorithm(SSA)is derived with a fitness function that encompasses two variables,namely,energy and distance.A series of experiments have been conducted to exhibit the enhanced performance of the FOA-EECPCR *** experimental outcomes demonstrate the enhanced performance of the FOA-EECPCR approach over other current methods.

关键词： Vehicular networks communication protocol clustering falcon optimization algorithm routing

MICP as a potential sustainable technique to treat or entrap contaminants in the natural environment:A review

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Environmental Science and Ecotechnology 2021年第2期6卷 13-20页

作者： Adharsh rajasekar Stephen Wilkinson Charles K.S.Moy Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC) Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CIC-AEET)Nanjing University of Information Science&TechnologyNanjing210044China Department of Civil Engineering University of Wollongong in DubaiDubaiUnited Arab Emirates Department of Civil Engineering Xi'an Jiaotong Liverpool UniversitySuzhouJiangsuChina

In the last two decades,developments in the area of biomineralization has yielded promising results making it a potentially environmentally friendly technique for a wide range of applications in engineering and wastewater/heavy metal *** Induced Carbonate Precipitation(MICP)has led to numerous patented applications ranging from novel strains and nutrient sources for the precipitation of *** are being constantly published to optimize the process to become a promising,cost effective,ecofriendly approach when compared with the existing traditional remediation technologies which are implemented to solve multiple contamination/pollution *** metal pollution still poses a major threat towards compromising the *** removal of heavy metals is of high importance due to their recalcitrance and persistence in the *** that perspective,this paper reviews the current and most significant discoveries and applications of MICP towards the conversion of heavy metals into heavy metal carbonates and removal of calcium from contaminated media such as polluted *** is evident from the literature survey that although heavy metal carbonate research is very effective in removal,is still in its early stages but could serve as a solution if the microorganisms are stimulated directly in the heavy metal environment.

关键词： Biomineralization MICP Urease enzyme Heavy meal entrapment

Fabrication of graphene oxide-keratin-chitosan nanocomposite as an adsorbent to remove turbidity from tannery wastewater

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Water Science and Engineering 2023年第2期16卷 184-191页

作者： Kobita Roy Thuhin Kumar Dey Mamun Jamal rajasekar Rathanasamy Moganapriya Chinnasamy MdElias Uddin Department of Leather Engineering Faculty of Mechanical EngineeringKhulna University of Engineering&TechnologyKhulna 9203Bangladesh Department of Chemistry Faculty of Civil EngineeringKhulna University of Engineering&TechnologyKhulna 9203Bangladesh Department of Mechanical Engineering Kongu Engineering CollegeErodeTamilnadu 638052India Department of Mining Engineering Indian Institute of Technology KharagpurWest Bengal 721302India

Excessive turbidity in water is aesthetically unappealing and severely malfunctions the photosynthesis process of aquatic ecosystems. This study aimed to evaluate the effectiveness of a nanocomposite adsorbent made of graphene oxide-keratin-chitosan for removing turbidity from tannery influent. The nanocomposite was fabricated with simple solution casting methods. Material dispersibility, bonding between composite materials (amide linkage), and the surface morphology of the nanocomposite were analyzed with the ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. At pH of 6, 2 g/L of adsorbent and a 25-min contact time resulted in about 88% of turbidity elimination. After the adsorption process, the total suspended solids, total dissolved solids, salinity, biochemical oxygen demand, and chemical oxygen demand of the tannery wastewater were reduced by 55%, 29%, 12%, 58%, and 75%, respectively. The optimum dosage of the nanocomposite with the maximum turbidity removal capacity was 12.62 mg/g. According the adsorption kinetic and isotherm models, the graphene oxide-keratin-chitosan nanocomposite played a key role in the turbidity removal process with chemisorption and electrostatic multilayer adsorption. This study provided methodological and mechanistic insights into the procedures of investigating the removal of turbidity from tannery wastewater with a novel composite material.

关键词： Adsorption Chitosan Electrostatic interaction Nanocomposite Wastewater

Organic-inorganic hybrid fluorescent sensor thin films of rhodamine B embedded Ag-SBA 15 for selective recognition of Hg(Ⅱ)ions in water

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Chinese Chemical Letters 2017年第7期28卷 1399-1405页

作者： Banupriya Cinnasamy Srinivasan Krishnan rajasekar Aruliah Murugan Kadarkarai Giovanni Benelli Dinakaran Kannaiyan Department of Chemistry Thiruvalluvar UniversityVellore632115India Department of Biotechnology Thiruvalluvar UniversityVellore632115India Department of Zoology Bharathiar UniversityCoimbatore641046India Department of Agriculture Food and EnvironmentUniversity of PisaPisa 56124Italy TheBioRobotics Institute Sant'Anna School of Advanced StudiesPontedera 56025Italy

Nowadays, the rapid and effective detection of low doses of heavy metal pollutants in contaminated water is a timely challenge in environmental pollution research. In this study, a rapid and highly sensitive assay for the detection of Hg^2＋based on quenching of metal-enhanced fluorescence of rhodamine B（RB）has been fabricated. RB and silver nanoparticle were incorporated into the mesoporous siliceous framework spin cast on a quartz glass through post-synthetic incorporation method. The morphology and crystallinity of mesoporous structure and Ag nanoparticle were characterized by transmission electron microscopy and X-ray diffraction analyses. Photoluminescence assays on the hybrid thin film of RB-Ag-SBA15 showed a high enhancement when compared to the intensity of silver free SBA15-RB in the wavelength of 575 nm. The fluorescence of RB-Ag-SBA15 thin film decreased gradually with the increase in the concentration of Hg^2＋and the detection limits were 10.54 nmol/L. Furthermore, the fluorescence intensity increased linearly with the concentration of Hg^2＋in the range from 1.0 ×10^-8mol/L to10× 10^-8mol/L, with a response time of a few seconds. In addition, this system offers a high selectivity over interfering cations such as Cd^2＋ and Pb^2＋. Overall, we have developed an optical assay having a wellordered mesoporous SBA15 containing Ag-RBfor selective detection of Hg^2＋in aqueous solution. The scheme combines the advantages of specific binding interactions between Hg^2＋and RB molecule and optical emission properties of RB. The method is suitable for a single-shot and irreversible analytical assay in a quartz glass/microtiter plate.

关键词： Mercury sensor Metal enhanced fluorescence Rhodamine B Ag nanoparticles SBA15 Fluorescence quenching