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Towards sustainable solar cells:unveiling the latest developments in bio-nano materials for enhanced DssC efficiency

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Clean Energy 2024年第3期8卷 238-257页

作者： sethu narayanan Tamilselvan s.shanmugan Research Centre for solar Energy Department of Engineering PhysicsCollege of EngineeringKoneru Lakshmaiah Education FoundationGreen FieldsGuntur DistrictVaddeswaramAndhra Pradesh 522502India

Fossil fuels-instrumental in powering the nineteenth-century Industrial Revolution-are now under heightened scrutiny due to environmental concerns and carbon ***,there is a global impetus towards achieving carbon-neutral energy production,with solar energy emerging as a cornerstone in this *** the past three decades,dye-sensitized solar cells(DssCs)have gained increasing prominence due to their unique *** review elucidates several crucial elements essential to DssC construction,notably bio-nano materials,prized for their structural flexibility,cost-effectiveness and high molar absorption *** delves into the intricate relationship between molecular structure and DssC performance,showcasing significant advancements with light-to-power conversion efficiencies reaching 11%.A comprehensive analysis of the photovoltaic performance of DssCs utilizing bio-nano-based dyes offers invaluable insights into the state of this rapidly evolving *** components under scrutiny include transparent conductive oxide(TCO)layers,physical techniques for metal oxide deposition onto TCO thin films,diverse dye variants and foundational knowledge of components ripe for growth and ***,the review outlines the latest breakthroughs in the field,providing glimpses into the current status of prototype DssCs.

关键词： DssC performance TCO thin films environmental solution

A new perspective on intervertebral disc calcification—from bench to bedside

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Bone Research 2024年第1期12卷 50-61页

作者： Emanuel J.Novais Rajkishen narayanan Jose A.Canseco Koen van de Wetering Christopher K.Kepler Alan s.Hilibrand Alexander R.Vaccaro Makarand V.Risbud Department of Orthopaedic surgery Sidney Kimmel Medical CollegeThomas Jefferson UniversityPhiladelphiaPAUSA Unidade Local de saúde do Litoral Alentejano Orthopedic DepartmentSantiago do CacémPortugal Rothman Orthopedic Institute at Thomas Jefferson University PhiladelphiaPAUSA

Disc degeneration primarily contributes to chronic low back and neck ***,there is an urgent need to understand the spectrum of disc degeneration phenotypes such as fibrosis,ectopic calcification,herniation,or mixed *** these phenotypes,disc calcification is the least *** calcification,by definition,is the pathological mineralization of soft tissues,widely studied in the context of conditions that afflict vasculature,skin,and ***,disc calcification is associated with poor surgical outcomes and back pain refractory to conservative *** is frequently seen as a consequence of disc aging and progressive degeneration but exhibits unique molecular and morphological characteristics:hypertrophic chondrocyte-like cell differentiation;TNAP,ENPP1,and ANK upregulation;cell death;altered Pi and PPi homeostasis;and local *** studies in mouse models have provided a better understanding of the mechanisms underlying this *** is essential to recognize that the presentation and nature of mineralization differ between AF,NP,and EP ***,the combination of anatomic location,genetics,and environmental stressors,such as aging or trauma,govern the predisposition to ***,the systemic regulation of calcium and Pi metabolism is less important than the local activity of PPi modulated by the ANK-ENPP1 axis,along with disc cell death and differentiation *** there is limited understanding of this phenotype,understanding the molecular pathways governing local intervertebral disc calcification may lead to developing disease-modifying drugs and better clinical management of degeneration-related pathologies.

关键词： degeneration metabolism intervertebral

*** model of riboflavin transporter deficiency(RTD)disorder reveals deficits in synaptic transmission and movement

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Genes & Diseases 2024年第4期11卷 120-123页

作者： Ramesh K.narayanan Gonzalo Perez-siles Kamila A.Marzec Alexandra Boyling Brent Neumann Manoj P.Menezes Marina L.Kennerson Northcott Neuroscience Laboratory ANZAC Research Institute-Sydney Local Health DistrictSydneyNSW 2139Australia sydney Medical school University of SydneySydneyNSw 2050Australia ANZAC Research Institute-sydney Local Health District SydneyNSW 2139Australia Neuroscience Program Monash Biomedicine Discovery Institute and Department of Anatomy and Developmental BiologyMonash UniversityMelbourneVictoria 3800Australia TY Nelson Department of Neurology and Neurosurgery and Kids Neuroscience Children's Hospital at WestmeadWestmeadSydneyNSW2145Australia Paediatrics and Child Health The University of SydneySydneySydneyNSW 2145Australia Molecular Medicine Laboratory Concord General Repatriation HospitalSydneyNSW 2139Australia

Riboflavin transporter deficiency(RTD),previously known as Brown-Vialetto-Van Laere syndrome,is a childhoodonset neurodegenerative disorder characterized by sensory and motor neuron degeneration causing ataxia,muscle weakness,optic atrophy,and respiratory *** in sLC52A2 and sLC52A3,solute carrier family members that encode riboflavin(RF)transporters RFVT2 and RFVT3,are known to cause RTD types 2 and 3,respectively.

关键词： RTD degeneration TD

Modular-integrative modeling: a new framework for building brain models that blend biological realism and functional performance

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National science Review 2024年第5期11卷 13-16页

作者： Mario senden sacha J.van Albada Giovanni Pezzulo Egidio Falotico Ibrahim Hashim Alexander Kroner Anno C.Kurth Pablo Lanillos Vaishnavi narayanan Cyriel Pennartz Mihai A.Petrovici Lea steffen Tonio Weidler Rainer Goebel Department of Cognitive Neuroscience Maastricht University Maastricht Brain Imaging Centre Maastricht University Institute of Neuroscience and Medicine(INM-6) and Institute for Advanced simulation(IAs-6) and JARA-Institut Brain structure-Function Relationships(INM-10) Jülich Research Center Institute of Zoology University of Cologne Institute of Cognitive sciences and Technologies The Bio Robotics Institute Scuola Superiore Sant'Anna RWTH Aachen University Donders Institute for Brain Cognition and BehaviorRadboud University Cognitive and systems Neuroscience Group Swammerdam Institute for Life Sciences University of Amsterdam Department of Physiology University of Bern FZI Research Center of Information Technology

To cope with the immense complexity of the brain, neuroscientific research often focuses on isolated brain structures or circumscribed perceptual, cognitive or motor functions [1]. This reductionist approach overlooks the intricate and multifaceted interplay among various structural and functional *** instance, even simple movements require the coordinated activation of numerous neuronal populations across multiple brain regions [2].

关键词： WORLD sURVEY PROJECTs

Delineation of groundwater potential zones using remote sensing and Geographic Information systems(GIs)in Kadaladi region,southern India

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Journal of Groundwater science and Engineering 2024年第2期12卷 147-160页

作者： stephen Pitchaimani V narayanan Mss Abishek Rs Aswin sK Jerin Joe RJ PG and Research Department of Geology V.O.Chidambaram CollegeThoothukudi 628008India Research scholar Manonmaniam Sundaranar UniversityTirunelveli 627012India

The primary objective of this research is to delineate potential groundwater recharge zones in the Kadaladi taluk of Ramanathapuram,Tamil Nadu,India,using a combination of remote sensing and Geographic Information systems(GIs)with the Analytical Hierarchical Process(AHP).Various factors such as geology,geomorphology,soil,drainage,density,lineament density,slope,rainfall were analyzed at a specific *** layers were evaluated for quality and relevance using saaty's scale,and then inte-grated using the weighted linear combination *** weights assigned to each layer and features were standardized using AHP and the Eigen vector technique,resulting in the final groundwater potential zone *** AHP method was used to normalize the scores following the assignment of weights to each criterion or factor based on saaty's 9-point ***-wise matrix analysis was utilized to calculate the geometric mean and normalized weight for various *** groundwater recharge potential zone map was created by mathematically overlaying the normalized weighted *** layers indicating major elements influencing groundwater occurrence and recharge were derived from satellite images.2 Results indicate that approximately 21.8 km of the total area exhibits high potential for groundwater *** recharge is viable in areas with moderate slopes,particularly in the central and southeastern regions.

关键词： Groundwater satellite image Remote sensing GIs techniques Analytical Hierarchy Process(AHP)

Adaptive Particle swarm Optimization Data Hiding for High security secret Image sharing

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Computer systems science & Engineering 2022年第12期43卷 931-946页

作者： s.Lakshmi narayanan Electronics and Communication Engineering Sri Ramakrishna Engineering CollegeCoimbatore641022Tamil NaduIndia

The main aim of this work is to improve the security of data hiding forsecret image sharing. The privacy and security of digital information have becomea primary concern nowadays due to the enormous usage of digital *** security and the privacy of users’ images are ensured through reversible datahiding techniques. The efficiency of the existing data hiding techniques did notprovide optimum performance with multiple end nodes. These issues are solvedby using separable Data Hiding and Adaptive Particle swarm Optimization(sDHAPsO) algorithm to attain optimal performance. Image encryption, dataembedding, data extraction/image recovery are the main phases of the proposedapproach. DFT is generally used to extract the transform coefficient matrix fromthe original image. DFT coefficients are in float format, which assists in transforming the image to integral format using the round function. After obtainingthe encrypted image by data-hider, additional data embedding is formulated intohigh-frequency coefficients. The proposed sDHAPsO is mainly utilized for performance improvement through optimal pixel location selection within the imagefor secret bits concealment. In addition, the secret data embedding capacityenhancement is focused on image visual quality maintenance. Hence, it isobserved from the simulation results that the proposed sDHAPsO techniqueoffers high-level security outcomes with respect to higher PsNR, security level,lesser MsE and higher correlation than existing techniques. Hence, enhancedsensitive information protection is attained, which improves the overall systemperformance.

关键词： Image sharing separable data hiding using adaptive particle swarm optimization(sDHAPsO) security access control

Convolution-Based Heterogeneous Activation Facility for Effective Machine Learning of ECG signals

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Computers, Materials & Continua 2023年第10期77卷 25-45页

作者： Premanand.s sathiya narayanan school of Electronics Engineering Vellore Institute of TechnologyChennai600127Indi

Machine Learning(ML)and Deep Learning(DL)technologies are revolutionizing the medical domain,especially with Electrocardiogram(ECG),by providing new tools and techniques for diagnosing,treating,and preventing ***,DL architectures are computationally more *** recent years,researchers have focused on combining the computationally less intensive portion of the DL architectures with ML approaches,say for example,combining the convolutional layer blocks of Convolution Neural Networks(CNNs)into ML algorithms such as Extreme Gradient Boosting(XGBoost)and K-Nearest Neighbor(KNN)resulting in CNN-XGBoost and CNN-KNN,***,these approaches are homogenous in the sense that they use a fixed Activation Function(AFs)in the sequence of convolution and pooling layers,thereby limiting the ability to capture unique *** various AFs are readily available and each could capture unique features,we propose a Convolutionbased Heterogeneous Activation Facility(CHAF)which uses multiple AFs in the convolution layer blocks,one for each block,with a motivation of extracting features in a better manner to improve the *** proposed CHAF approach is validated on PTB and shown to outperform the homogeneous approaches such as CNN-KNN and *** PTB dataset,proposed CHAF-KNN has an accuracy of 99.55%and an F1 score of 99.68%in just 0.008 s,outperforming the state-of-the-art CNN-XGBoost which has an accuracy of 99.38%and an F1 score of 99.32%in 1.23 *** validate the generality of the proposed CHAF,experiments were repeated on MIT-BIH dataset,and the proposed CHAF-KNN is shown to outperform CNN-KNN and CNN-XGBoost.

关键词： Electrocardiogram convolution neural network machine learning activation function

Influence of thermomechanical processing on microstructure,mechanical and strain hardening properties of single-phase Mg-4Li-0.5Ca alloy for structural application

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Journal of Magnesium and Alloys 2020年第4期8卷 1262-1268页

作者： N.sriraman s.Kumaran sathiya narayanan N school of Mechanical Engineering SASTRA Deemed to be University ThirumalaisamudramThanjavurTamilnadu 613401India Department of Metallurgical and Materials Engineering National Institute of Technology TiruchirappalliTamil Nadu 620015India

The single-phase Mg-4Li-0.5Ca alloy was rolled at three different temperatures(250,300 and 350℃)and followed by annealing at 200°C for 10 *** evaluate the mechanical properties,the tensile test was conducted at a constant strain rate of 10^(-3)s^(-1).Factors influencing the tensile strength and strain hardening properties were assessed by microscopy,XRD and EBsD ***,Kocks-Mecking plots(K-M)were used to determine the different stages of strain hardening exhibited by the variously processed Mg-4Li-0.5Ca alloy test *** ultimate tensile strength has decreased as hot-rolling temperature in creases with increased *** strain hardening properties such as hardening capacity(Hc),strain hardening exponent(n)are increased significantly with an increase in hot rolling temperature and subsequent annealing.

关键词： Mg-4Li-0.5Ca Hot rolling Twins Mg2Ca Hardening capacity

Effect of Polymer Inclusion in Preparation of Thick LZO Buffer Layers for YBCO Coated Conductors

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Journal of Materials science & Technology 2013年第3期29卷 261-266页

作者： Vyshnavi narayanan Isabel Van Driessche sol-gel Centre for Research on Inorganic Powders and Thin film synthesis-sCRiPTs Department of Inorganic and Physical ChemistryGhent UniversityKrijgslaan 281-S3B-9000 GentBelgium

In this work, water-based precursor solutions suitable for dip-coating of thick La2Zr2O7 （LZO） buffer layers for coated conductors on Ni-5%W substrates with an inclusion of polymeric polyvinyl pyrrolidone were developed. The effect of varying percentage of the polymer addition on the preparation of the deposited films with maximum crack-free thickness was investigated. This novel water-based chemical solution deposition method involving polymers in two different chelate-chemistry compositions revealed the possibility to grow single, crack-free layers with thicknesses ranging from 140 to 280 nm, with good crystallinity and epitaxial growth. The effect of increasing polymer concentrations on the morphology and the structure of the films was studied. The appropriate buffer layer action of the films in preventing Ni diffusion was studied by X-ray photoelectron spectroscopy.

关键词： Buffer layers Thick lanthanum zirconate films Chemical solution deposition Polyvinyl pyrrolidone Water-based precursor design Coated conductors