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Bubble-Enriched Smoothed Finite Element Methods for Nearly-Incompressible Solids

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Computer Modeling in Engineering & Sciences 2021年第5期127卷 411-436页

作者： Changkye Lee Sundararajan natarajan Jack S.Hale Zeike A.Taylor Jurng-Jae Yee Stephane P.A.Bordas University Core Research Center for Disaster-Free and Safe Ocean City Construction Dong-A UniversityBusan49315Korea Department of Mechanical Engineering Indian Institute of Technology MadrasChennai600036India Faculty of Science Technology and CommunicationUniversity of LuxembourgEsch-sur-AlzetteL-4364Luxembourg CISTIB-Center for Computational Imaging&Simulation Technologies in Biomedicine School of EngineeringLeedsLS29JTUK

This work presents a locking-free smoothed finite element method(S-FEM)for the simulation of soft matter modelled by the equations of quasi-incompressible *** proposed method overcomes well-known issues of standard finite element methods(FEM)in the incompressible limit:the over-estimation of stiffness and sensitivity to severely distorted *** concepts of cell-based,edge-based and node-based S-FEMs are extended in this paper to ***,a cubic bubble function is utilized to improve accuracy and *** the bubble function,an additional displacement degree of freedom is added at the centroid of the *** numerical studies are performed demonstrating the stability and validity of the proposed *** obtained results are compared with standard FEM and with analytical solutions to show the effectiveness of the method.

关键词： Strain smoothing smoothed finite element method bubble functions hyperelasticity mesh distortion

sp^(2)碳用于3D打印技术综述:材料、性能和应用

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新型炭材料（中英文） 2022年第6期37卷 1046-1065页

作者： Satendra Kumar Manoj Goswami Netrapal Singh Sathish natarajan Surender Kumar Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India CSIR-Advanced Materials and Processes Research Institute(AMPRI) Bhopal 462026India

3D打印可以改变现有的生产方法,是第四次工程革命中的一项现代技术。它从成型原理上提出了分层制造、逐层叠加成型的新颖生产方法,从根本上简化了制造工艺,实现了大规模定制生产。然而,这一新技术仍存在许多问题。除了纯石墨烯外,sp^(2... 详细信息

3D打印可以改变现有的生产方法,是第四次工程革命中的一项现代技术。它从成型原理上提出了分层制造、逐层叠加成型的新颖生产方法,从根本上简化了制造工艺,实现了大规模定制生产。然而,这一新技术仍存在许多问题。除了纯石墨烯外,sp^(2)碳具有好的亲水性,3D打印难度较小。sp^(2)碳还可在3D打印中的各种阶段应用。纯石墨烯的疏水性使其难以在水系介质中打印和加工。毛细管油墨的发展使得纯石墨烯的3D打印成为可能。本文综述了sp^(2)碳的3D打印技术的最新进展。首先简要概述了3D打印技术,随后概述了sp^(2)碳的3D打印及其在各种方面的应用。最后,讨论了这一新领域的发展前景和机遇。

关键词： 3D打印技术 sp^(2)碳碳基复合材料应用

Magnetic,thermal stability and dynamic mechanical properties of beta isotactic polypropylene/natural rubber blends reinforced by NiZn ferrite nanoparticles

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Defence Technology（防务技术） 2019年第6期15卷 958-963页

作者： Lih-Jiun Yu Sahrim Hj Ahmad Ing Kong Mouad ATarawneh Shamsul Bahri Bin Abd Razak Elango natarajan Chun Kit Ang Department of Mechanical Engineering Faculty of EngineeringTechnology and Built EnvironmentUCSI UniversityNo 1Jalan Menara GadingUCSI Heights(Taman Connaught)Cheras56000Kuala LumpurMalaysia School of Applied Physics Faculty of Science and TechnologyUniversity Kebangsaan Malaysia43600BangiSelangor Darul EhsanMalaysia School of Engineering and Mathematical Sciences La Trobe UniversityBundooraVIC3086Australia Department of Physics College of ScienceAl-Hussein Bin Talal UniversityP.O Box 20Ma'anJordan Department of Food Science and Technology University Malaysia TerengganuKuala NerusTerengganuMalaysia

The dispersion of magnetic nanoparticles in matrix is crucial to ensure optimum performance of the *** difficulty level of achieving good dispersion is further increase when a multi-phases of matrix is present.A pre-coating technique of magnetic nanoparticles with polypropylene using ball-mill prior to melt-blending process was employed to prepare a multi-phases thermoplastic natural rubber *** effect of filler loading(2 wt%-10 wt%) on morphology,structure,magnetic properties,thermal stability and dynamic mechanical properties of the composites were *** was found that the NiZn ferrite nanoparticles act as nucleating agent to form beta isostatic polypropylene thermoplastic *** composites’ magnetic properties are directly dependent on the filler *** dispersion of magnetic fillers in polymer matrix plays role in affecting the magnetic properties and thermal *** preference of filler to locate at amorphous phase has distorted the chain orientation of natural rubber and ***,the polymorphism and crystallinity of the matrix varied as the filler loading increased,affecting the dynamic mechanical *** was found that 8 wt% NiZn nanocomposite exhibits highest E’ and tanδ,indicating the dynamic mechanical properties of NiZn nanocomposite are affected by β-phase degree.

关键词： Magnetic Thermoplastic natural rubber Nanoparticles Composites

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

Fluid-driven Hydrovolcanic Activity along Fracture Zones and near Seamounts:Evidence from Deep-sea Fe-rich Spherules,Central Indian Ocean Basin

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1591-1603页

作者： Ankeeta AMONKAR Sridhar D.IYER Elapavalooru V.S.S.K.BABU natarajan SHAILAJHA Areef SARDAR S.MANJU CSIR-National Institute of Oceanography Dona PaulaGoa 403004India Marine Science School of EarthOcean and Atmospheric SciencesGoa UniversityGoa 403206India Formerly with CSIR-National Institute of Oceanography Dona PaulaGoa 403004India CSIR-National Geophysical Research Institute HyderabadTelangana 500007India Department of Earth Science Pondicherry UniversityPondicherry 605014India

An insight on occurrence of Fe-rich spherules from the Central Indian Ocean Basin(CIOB)provides an understanding of their distribution at a water depth of>5,000 *** the present study,Fe-rich spherules are identified to occur in two different sediment types(i.e.,siliceous and pelagic)and tectonic settings(*** seamounts and fracture zones).These are single spheres or aggregates,of different sizes(63 to 390μm)and show textural variability(smooth/quenched,brickwork,corkscrew,interlocking and dendritic).A comparative study based on physical morphology and chemical composition suggests a common mechanism of *** association of spherules with fracture zones(FZ)and seamounts signifies that morpho-tectonic features play an important role in fluid-driven *** on the evidence and geologic conditions existing in the basin,we conclude that molten fuel-coolant interaction(MFCI)coupled with submarine hydrothermal exhalations could be an ideal mechanism for the formation of spherules and *** accretion of the spherules on the surface sediments could be a result of recent volcanic phenomena,while those occurring at different depths(280-355,and 460-475 cm-bsf)within the sediment core indicate two different *** study provides a global implication in understanding fluid-driven magmatism in a deep-sea intraplate environment.

关键词： Fe-rich spherules deep-sea sediments hydrovolcanic activity CIOB

Two types of uranium mineralization in Gulcheru quartzite:Fracture-controlled in Ambakapalle area and litho-controlled in Tummalapalle area,Cuddapah Basin,Andhra Pradesh,India

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China Geology 2019年第2期2卷 142-156页

作者： Sukanta Goswami Pradeep Kumar Upadhyay Bhaskaran Saravanan V natarajan Mohan Babu Verma Atomic Minerals Directorate for Exploration and Research Department of Atomic EnergyBangalore 560072India Atomic Minerals Directorate for Exploration and Research Department of Atomic Energy BegumpetHyderabad 500016India

The Cuddapah Basin in southern India has a potential for uranium mineralization due to some favorable factors such as its temporal, stratigraphic and tectonic settings. Systematic exploration program conducted by the Atomic Minerals Directorate for Exploration and Research (AMD) within the Cuddapah Basin resulting in the recognition of distinct types of uranium mineralization, viz., strata bound type, fracture/shear-controlled type and tabular type. The Gulcheru Formation which is the lowermost unit of the Cuddapah Basin is dominantly arenitic in nature. During the exploration works, a number of uranium anomalies were identified with dimensions ranging from 1 m to 1.5 km. Gulcheru quartzite hosted uranium mineralization is intermittent and inconsistent in nature. The anomalous outcrops are distributed over a strike length of ca. 60 km between Gandi in the SE and Ambakapallein the NW. Presently, two different types of uranium mineralization are characterized on the basis of field observations, mapping and structural interpretation, petro-mineralogy and geochemistry. Although the host rock is same for both types, the mechanism of uranium enrichment is totally different. The Ambakapalle uranium mineralization is controlled by fault zone and associated hydrothermal activity. Whereas, the Tummalapalle uranium mineralization is litho-controlled in nature influenced by suitable four ‘P’ factors, i.e., provenance, porositypermeability, precipitation and preservation. The geochemical characterization of Gulcheru quartzite suggest a passive margin type of provenance setting. Petro-mineralogically the quartz arenite suggests enough textural as well as mineralogical maturity. Ambakapalle quartzite is slightly strained and deformed due to faulting. Analysis of selected samples recorded 0.01% to 0.048% U3O8 and <0.01% ThO2. Petrographic observation revealed that the anomalies were appeared due to secondary uranium minerals occurring as surficial encrustations, fracture filling an

关键词： Uranium mineralization Fracture-controlled mineralization Litho-contralled mineralization Gulcheru quartzite Hydrothermal alteration Andhra Pradesh India

Exposure to polycyclic aromatic hydrocarbons with special focus on cancer

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Asian Pacific Journal of Tropical Biomedicine 2015年第3期5卷 182-189页

作者： Thamaraiselvan Rengarajan Peramaiyan Rajendran natarajan Nandakumar Boopathy Lokeshkumar Palaniswami Rajendran Ikuo Nishigaki Department of Chemical Pathology School of medical SciencesUniversiti Sains Malaysia.Health Campus NPO-International Laboratory of Biochemistry Department of Microbiology Immunology and Genetics.Ben Gurion University of the Negev Department of Pharmacology and Environmental Toxicology.Dr.ALM PG IBMS University of Madras Department of Applied Zoology and Biotechnology Vivekananda CollegeAffiliated to Madurai Kamaraj University

Polycyclie aromatic hydrocarbons(PAHs) are a group of compounds consisting of two or more fused aromatic *** of them are formed during incomplete combustion of organic materials such as wood and fossil fuels,petroleum products,and *** composition of PAH mixtures varies with the source and is also affected by selective weathering effects in the *** are ubiquitous pollutants frequently found in a variety of environments such as fresh water and marine sediments,the atmosphere,and *** to their widespread distribution,the environmental pollution due to PAHs has aroused global *** PAHs and their epoxides are highly toxic,mutagenic and/or carcinogenic to microorganisms as well as to higher forms of life including *** main aim of this review is to provide contemporary information on PAH sources,route of exposure,worldwide emission rate,and adverse effects on humans,especially with reference to cancer.

关键词： PAH Environmental pollution DMBA Benzo(a)pyrene Cancer

Curcumin： A putative chemopreventive agent

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Journal of Life Sciences 2009年第5期3卷 47-53页

作者： Loganathan Palanikumar natarajan Panneerselvam Research Centre and Post Graduate Studies in Botany The Madura College Madurai 625011 India

Curcumin （diferuloylmethane）, the main yellow bioactive component of turmeric has been shown to have a wide spectrum of biological actions. It is anti-inflammatory, antioxidant, anticarcinogenic, antimutagenic, anticoagulant, antidiabetic, antibacterial, antifungal, antiprotozoal, antiviral, antifibrotic, antivenom, anti-ulcer and hypocholesteremic. Its anticancer effect is mainly mediated through induction of apoptosis. Its anti-inflammatory, anticancer and antioxidant roles may be clinically exploited to control rheumatism, carcinogenesis and oxidative stress-related pathogenesis. Clinically, curcumin has already been used to reduce post-operative inflammation, Thus, curcumin has the potential of chemopreventive action and has been used in the development of modern medicine to treat various diseases.

关键词： curcumin anticancer and chemo-preventive agent

MicroRNAs in neuroblastoma tumorigenesis,therapy resistance,and disease evolution

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Cancer Drug Resistance 2019年第4期2卷 1086-1105页

作者： natarajan Aravindan Karthikeyan Subramanian Dinesh Babu Somasundaram Terence S.Herman Sheeja Aravindan Department of Radiation Oncology University of Oklahoma Health Sciences CenterOklahoma CityOK 73104USA Stephenson Cancer Center Oklahoma CityOK 73104USA

Neuroblastoma(NB)deriving from neural crest cells is the most common extra-cranial solid cancer at *** originates within the peripheral sympathetic ganglia in adrenal medulla and along the midline of the ***,NB exhibits significant heterogeneity stretching from spontaneous regression to rapid progression to therapy ***(miRNAs,miRs)are small(19-22 nt in length)non-coding RNAs that regulate human gene expression at the post-transcriptional level and are known to regulate cellular signaling,growth,differentiation,death,stemness,and ***,the function of miRs in tumorigenesis,progression and resistance is of utmost importance for the understanding of dysfunctional cellular pathways that lead to disease evolution,therapy resistance,and poor clinical *** the last two decades,much attention has been devoted to understanding the functional roles of miRs in NB *** review focuses on highlighting the important implications of miRs within the context of NB disease progression,particularly miRs’influences on NB disease evolution and therapy *** this review,we discuss the functions of both the“oncomiRs”and“tumor suppressor miRs”in NB progression/therapy *** are the critical components to be considered during the development of novel miR-based therapeutic strategies to counter therapy resistance.

关键词： miRNAs progressive neuroblastoma therapy resistance oncomiRs tumor suppressor miRs tumor progression