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Distribution of clay minerals in marine sediments off Chennai,Bay of Bengal,India:Indicators of sediment sources and transport processes

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International Journal of sediment Research 2014年第1期29卷 11-23页

作者： subramanian VEERAsINGAM Ramdoss VENkATACHALAPATHY Thirunavukkarasu RAMkUMAR CsIR-National Institute of Oceanography Department of Physics Annamalai University Centre of Advanced study in Marine Biology Faculty of Marine SciencesAnnamalai University Department of Earth sciences Annamalai University

Clay mineralogy,texture size and statistical analyses were carried out on surface sediments from the continental shelf of Chennai,Bay of Bengal,*** purpose of this study is to characterize the clay mineral distribution and its relation to the hydrodynamics off Chennai to identify the sources and transport pathways of the marine *** of clay minerals in coastal sediments by Fourier Transform Infrared(FTIR)spectroscopy has provided the association of quartz,feldspar,kaolinite,chlorite,illite and iron oxides(magnetite and hematite) derived from river catchments and coastal ***,chlorite,illite,iron oxides,and organic matter are the dominant minerals in Cooum,and Adayar *** quartz and feldspar zones were identified in Marina,which are being confined the sand zone and paralleling the *** strong relationships among the wave energy density,sand,quartz and carbonate revealed that wave induced littoral drift system play a dominant role in transportation and deposition of sediments in the Chennai *** sediment texture and minerals data are in agreement well with the previous results of hydrodynamics and littoral drift models in this *** statistical analyses(correlation,cluster and factor analyses) were carried out and obtained results suggested that clay minerals and organic matter are trapped in silt and clay particles,whereas quartz,feldspar and carbonate are associated with sand *** of sediment sources and transport processes from this study will be useful to predict the fate of the pollutants released from land or the potential change in sediment delivery to coastal areas.

关键词： Clay minerals Texture size Marine sediment Hydrodynamics Multivariate statistics

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Characterization and bacterial toxicity of lanthanum oxide bulk and nanoparticles

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Journal of Rare Earths 2012年第12期30卷 1298-1302页

作者： Brabu Balusamy Yamuna Gowri kandhasamy Anitha senthamizhan Gopalakrishnan Chandrasekaran Murugan siva subramanian kumaravel Tirukalikundram s Nanotechnology Research Center SRM University GLR Laboratories Private Limited Department of Physics Indian Institute of Technology-Madras GLR Laboratories Private Limited WillinghamCambridge

This study evaluated the bacterial toxicity of lanthanum oxide micron and nano sized particles using shake flask method against gram-positive （staphylococcus aureus） and gram-negative （Escherichia coli, Pseudomonas aeruginosa） bacteria. Particle size, morphology and chemical composition were determined using scanning electron microscopy （sEM） and energy dispersive X-ray spectroscopy （EDs）. Results indicated that lanthanum oxide nanoparticles showed antimicrobial activity against staphylococcus aureus, but not against Escherichia coli and Pseudomonas aeruginosa. It was speculated that lanthanum oxide produced this effect by interacting with the gram-positive bacterial cell wall. Furthermore, lanthanum oxide bulk particles were fotmd to enhance the pyocyanin pigment production in Pseudomonas aeruginosa.

关键词： lanthanum oxide: nanoparticles: bacterial toxicity: pyocyanin rare earths

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Improving Decision Tree Performance by Exception Handling

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International Journal of Automation and computing 2010年第3期7卷 372-380页

作者： Appavu Alias Balamurugan subramanian s.Pramala B.Rajalakshmi Ramasamy Rajaram Department of Information Technology Thiagarajar College of Engineering Madurai India Department of Computer science Thiagarajar College of Engineering Madurai India

This paper focuses on improving decision tree induction algorithms when a kind of tie appears during the rule generation procedure for specific training datasets. The tie occurs when there are equal proportions of the target class outcome in the leaf node＇s records that leads to a situation where majority voting cannot be applied. To solve the above mentioned exception, we propose to base the prediction of the result on the naive Bayes （NB） estimate, k-nearest neighbour （k-NN） and association rule mining （ARM）. The other features used for splitting the parent nodes are also taken into consideration.

关键词： Data mining classification decision tree majority voting naive Bayes (NB) k nearest neighbour (k NN) association rule mining (ARM)

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A comprehensive investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： s.sAURABH R.kIRAN D.sINGH R.VAIsH V.s.CHAUHAN school of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHsDT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. Various helicoidal layup configurations including helicoidal recursive(HR), helicoidal exponential(HE), helicoidal semi-circular(Hs), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is validated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

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semantic segmentation of Lumbar Vertebrae Using Meijering U-Net(MU-Net)on spine Magnetic Resonance Images

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Computer Modeling in Engineering & sciences 2025年第1期142卷 733-757页

作者： Lakshmi s V V shiloah Elizabeth Darmanayagam sunil Retmin Raj Cyril Department of Computer science and Engineering College of Engineering GuindyAnna UniversityChennai600025India Department of Information Technology Madras Institute of TechnologyAnna UniversityChrompetChennai600044India

Lower back pain is one of the most common medical problems in the world and it is experienced by a huge percentage of people *** to its ability to produce a detailed view of the soft tissues,including the spinal cord,nerves,intervertebral discs,and vertebrae,Magnetic Resonance Imaging is thought to be the most effective method for imaging the *** semantic segmentation of vertebrae plays a major role in the diagnostic process of lumbar *** is difficult to semantically partition the vertebrae in Magnetic Resonance Images from the surrounding variety of tissues,including muscles,ligaments,and intervertebral discs.U-Net is a powerful deep-learning architecture to handle the challenges of medical image analysis tasks and achieves high segmentation *** work proposes a modified U-Net architecture namely MU-Net,consisting of the Meijering convolutional layer that incorporates the Meijering filter to perform the semantic segmentation of lumbar vertebrae L1 to L5 and sacral vertebra ***-colour mask images were generated and used as ground truth for training the *** work has been carried out on 1312 images expanded from T1-weighted mid-sagittal MRI images of 515 patients in the Lumbar spine MRI Dataset publicly available from Mendeley *** proposed MU-Net model for the semantic segmentation of the lumbar vertebrae gives better performance with 98.79%of pixel accuracy(PA),98.66%of dice similarity coefficient(DsC),97.36%of Jaccard coefficient,and 92.55%mean Intersection over Union(mean IoU)metrics using the mentioned dataset.

关键词： Computer aided diagnosis(CAD) magnetic resonance imaging(MRI) semantic segmentation lumbar vertebrae deep learning U-Net model

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Predicting Maximum Lifespan Limits at Mean Menopausal Age

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Journal of Mathematical Research with Applications 2025年第1期 133-142页

作者： M.sUMATHI s.ANTONY CARLA Department of Mathematics N.M.S.S.Vellaichamy Nadar College Research scholar (Part-time) Madurai Kamaraj University

The age at which a woman enters natural menopause has also been associated to death from any cause. Menopause is a natural component of aging that happens between the ages of 45 and 55, with the average menopausal age being 51. Previous research has revealed the age at which women reach menopause, but there is no evidence to support the link between menopause and longevity. We made a study in assessing the limits of maximum lifespan at menopausal age in our previous article. In this paper, we aim to predict the maximum lifespan of women at mean menopausal age.

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structural,Dielectric,and Magnetic studies on Electrospun Magnesium Ferrite-Polyvinylidene Fluoride Core–shell Composite Fibers

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Acta Metallurgica sinica(English Letters) 2014年第4期27卷 557-562页

作者： V.Revathi s.Dinesh kumar P.Chithra Lekha V.subramanian T.s.Natarajan C.Muthamizhchelvan New Horizon College of Engineering Bangalore 560103India Microwave Laboratory Department of PhysicsIIT MadrasChennai 600036India sRM University KattankulathurChennai 603203India

The sub-micron（of the order of 150 nm） thick core–shell composite fibers of magnesium ferrite-polyvinylidene fluoride are prepared by *** loading of magnesium ferrite is varied from 1 to 10 wt%.The study results by X-ray diffraction,scanning electron microscope,and infra-red spectroscopy indicate the formation of core–shell structure and an enhancement in the amount of b-phase compared to a-phase in the polyvinylidene *** particle size of the magnesium ferrite in the fiber is evaluated to be 30 *** low frequency dielectric studies indicate that the addition of the magnesium ferrite increases the polarization resulting in the increase in the dielectric constant but decreases the dielectric *** magnetization measurements indicate an increased value of coercivity compared to bulk due to the nano-size of the magnesium *** microwave absorption at the ferromagnetic resonance increases with the increase in the concentration of magnesium *** resonance field is found to vary with the loading of MFO.

关键词： Electrospinning Polymer composites Dielectric properties Magnetic properties X-ray diffraction(XRD) Microwave absorption

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Human endogenous retrovirus type-W and multiple sclerosis–related smoldering neuroinflammation

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Neural Regeneration Research 2025年第3期20卷 813-814页

作者： Joel Gruchot Laura Reiche Andrew Chan Robert Hoepner Patrick küry Department of Neurology Medical Faculty and University Hospital DüsseldorfHeinrich Heine University DüsseldorfDüsseldorfGermany Department of Neurology InselspitalBern University Hospital and University of BernBernSwitzerland

Introduction to human endogenous retrovirus type-W(HERV-W): Genomic inheritance from the past includes retroviral sequences that have been stably incorporated into our genomes and account for up to 8% of human DNA.

关键词： endogenous inflammation Human

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Refractory gastroesophageal reflux disease

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Gastroenterology Report 2015年第1期3卷 41-53页

作者： Charumathi Raghu subramanian George Triadafilopoulos Internal Medicine Guthrie ClinicSayrePAUSA Division of Gastroenterology Stanford University School of MedicineStanfordCAUSA

Gastroesophageal reflux disease(GERD)is a condition that develops when the reflux of stomach contents into the esophagus causes troublesome symptoms,esophageal injury,and/or *** of proton pump inhibitors(PPI)remains the standard therapy for GERD and is effective in most *** whose symptoms are refractory to PPIs should be evaluated further and other treatment options should be considered,according to individual patient *** to PPIs could be total(no symptoms),partial(residual breakthrough symptoms),or absent(no change in symptoms).Patients experiencing complete response do not usually need further *** with partial response can be treated surgically or by using emerging endoscopic *** who exhibit no response to PPI need further evaluation to rule out other causes.

关键词： gastroesophageal reflux disease acid-related diseases pH monitoring endoscopy

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Diagnosis and therapy of esophageal squamous cell dysplasia and early esophageal squamous cell cancer

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Gastroenterology Report 2017年第4期5卷 247-257,I0001页

作者： Charumathi Raghu subramanian George Triadafilopoulos Internal Medicine Guthrie clinicSayrePAUSA and Division of Gastroenterology and Hepatology Stanford UniversityStanfordCAUSA

Esophageal squamous cell carcinoma(EsCC)and esophageal adenocarcinoma(EAC)comprise the majority of esophageal cancers,and they differ from each other in several *** the incidence of EAC is increasing in the West,EsCC is still the predominant cancer type *** dysplasia is considered to be a premalignant lesion to EsCC;however,the exact probability and timeline of malignant transformation are not known,hence the lack of guidelines for management of such *** carries a poor prognosis if not detected early,so there has been a trend towards early detection and *** modalities include endoscopic ultrasound,white light endoscopy,non-endoscopic methods such as biomarkers,*** diagnosis can identify a subset of patients who could benefit from less invasive endoscopic eradication *** review aims to discuss the different modalities for diagnosis and treatment of early esophageal squamous lesions,including the newer endoscopic therapies,and comparison of different techniques.

关键词： esophageal squamous cell carcinoma esophageal squamous cell dysplasia endoscopic resection radiofrequency ablation

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