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Experimental study on behaviors of polypropylene fibrous concrete beams

Journal of Zhejiang University-science A(Applied Physics & Engineering) 2007年第7期8卷 1101-1109页

作者： sUJI D. natesan s. C. MURUGEsAN R. sathyabama Institute of science and Technology Chennai Tamil Nadu India VLB Janakiammal College of Engineering and Technology Coimbatore Tamil Nadu India Gojan school of Business and Technology Red Hills Chennai Tamil Nadu India

synthetic fibers made from nylon or polypropylene have gained application when loose and woven into geo textile form although no information on the matrix’s mechanical performance is obtained so that more understanding of their structural contribution to resist cracking can be determined. This paper presents the results of an experimental investigation to determine the performance characteristics of concrete reinforced with a polypropylene structural fiber. In this investigation “Fiber mesh” brand of fibers manufactured by sL Concrete system, Tennessee, UsA and marketed by M/s Millennium Building system, Inc., Ban-galore, India are used. The lengths of the fibers used were 24 mm. Fiber dosages used were 0.9, 1.8, 2.7 kg/m3. A total of three mixtures, one for each fiber dosage were made. A standard slump cone test was conducted on the fresh concrete mix with and without fibers to determine the workability of the mix. The test program included the evaluation of hardened concrete properties such as compressive, split tensile, modulus of rupture and flexural strengths. The increase in compressive strength is about 36.25%, 26.20%, and 23.75% respectively that of plain concrete. This increase in strength was directly proportional to amount of fibers present in the mix. The increase in flexural strength for Mixes I^III is about 21%, 16.6%, and 23% respectively that of plain concrete specimens. An experimental investigation was also made to study the behaviors of reinforced fibers concrete beams (with longitudinal reinforcements) under two-point loading. The deflection and crack patterns were also studied. The improvements in strength and ductility characteristics were discussed.

关键词： Fiber Reinforcement Concrete Mechanical properties Polypropylene Fibre Reinforced Concrete (PFRC)

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Lichens of the sirumalai hills,Eastern Ghats with one genus and six species new to India

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studies in Fungi 2021年第1期6卷 204-212页

作者： Nayaka s Joseph s Rajaram sK natesan s sankar K David MLR Upreti DK Lichenology Laboratory CSIR-National Botanical Research InstituteRana Pratap MargLucknow-226001Uttar PradeshIndia Department of Biotechnology Kamaraj College of Engineering and TechnologyK.VellakulamNear VirudhunagarMadurai-625701Tamil NaduIndia

Lichens of sirumalai hills are reported here for the first *** biota comprised of 95 *** genus Japewiella is reported for the first time in India and is represented by ***(***.)***,the following six taxa including one variety are new to India *** atra(Pers.)***.,Graphis brevicarpa ***.,Kashiw.&***,Micarea erratica(Körb.)Hertel,Rambold&Pietschm.,Pertusaria cicatricosa *** ***,Elix&streimam,Porina subargillacea Müll Arg.,and Pyxine schmidtii *** accounts for all the new records to India are provided to facilitate their *** redingeri Grube and Lepraria caesiella *** are reported for the first time from south *** all above,29 species are recorded for the first time from the state of Tamil *** lichen biota of the area is primarily corticolous in habitats and dominated by crustose form.

关键词： lichenized fungi new records south India Tamil Nadu tropical lichens

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南印度茶树的不同部分及红茶茶汤中各种元素的含量

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广东茶业 1991年第3期 34-42页

作者： s natesan 莫治雄

用电感偶合等离子体原子发射光谱测定茶树的不同部分(茶芽、老熟叶、小枝、粗枝和根系)CTC红茶和传统红茶、泡制1分钟和5分钟的茶汤中各种元素的含量。根据这些测定结果,计算和讨论了1000公斤商品茶叶中每种元素的含量、泡制后每种元素... 详细信息

用电感偶合等离子体原子发射光谱测定茶树的不同部分(茶芽、老熟叶、小枝、粗枝和根系)CTC红茶和传统红茶、泡制1分钟和5分钟的茶汤中各种元素的含量。根据这些测定结果,计算和讨论了1000公斤商品茶叶中每种元素的含量、泡制后每种元素进入茶汤中的数量,以及人们通过喝茶对各种元素的可能吸收量。在茶树同化的各种元素中,茶芽(用于制造商品茶叶,具有重要的经济价值)中含N、P、K和Mg较高,而老熟叶含Al、Ba、Ca、Cd、Mn、Pb和sr较高。泡制时进入红茶茶汤的各种元素中,K的含量最高(>10000微克/克茶叶),其次是P(700—1200微克/克),Mg(300—700微克/克)Ca和Al(每种150—300微克/克),Mn(60—150微克/克),Cu、Na、si和Zn(每种6—50微克/克),B、Ba、Cr、Fe、Ni和Pb(每种1—6微克/克),sr、Co和Cd(每种sr的可溶性较低(小于总量的10%),Al、B、Cd、Co、Cr、Cu、Mg、Mn、P、Pb、si和Zn的可溶性中等(10—50%),K、Na和Ni的可溶性最高(>50%)。在泡制1分钟和5分钟的茶汤中所有元素的溶解度的总平均结果表明,1分钟溶解进入茶汤的数量占5分钟的68%。

关键词：茶树生长南印度茶园土壤粗枝元素对泡制商品茶多年生作物一芽二叶摄取量

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作物种植地的土壤测定

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土壤学进展 1990年第4期18卷 20-24页

作者： V.Ranganathan li s.natesan 林智

了解土壤的理化特性和对土壤测定值与作物产量进行相关性研究的传统土壤测定系统,在肥料的经济利用方面已起了显著作用。表示养分有效性的土壤测定参数随作物产量的增加而减小;pH、土壤耕性和理化特性等基本土壤肥力参数,则随产量的增... 详细信息

了解土壤的理化特性和对土壤测定值与作物产量进行相关性研究的传统土壤测定系统,在肥料的经济利用方面已起了显著作用。表示养分有效性的土壤测定参数随作物产量的增加而减小;pH、土壤耕性和理化特性等基本土壤肥力参数,则随产量的增加而增大。在以保持作物高产为目的的集约栽培系统中,除要探明营养元素吸收率及在植物体内运转、分配和代谢外,还需进一步了解保持有效养分平衡的动力学,在土壤中(特别是根吸收区)的移动速率、单位时间(年)来自土壤和其它来源的有效养分数量及达到一定产量目标,作物对各种营养元素的总需要量等等。随着产量的增加,则更要注意通过良好的耕作、植保和有效的施肥措施,保证作物的健壮生长。本文着重介绍了茶树集约栽培系统中进行的典型分析。

关键词：作物土壤测定种植地

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茶树对施钾肥的反应

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福建茶叶 1987年第4期 44-48页

作者： Y.Ranganathan ,s.natesan ,彭伟正

施钾对茶树的效应大小主要取决于主导土壤中钾素的状态,土壤满足不同年龄、不同生长势、不同产量的茶树对钾素需要的能力。无论土壤本身含有的钾还是外施的钾,其持续效力决定于土壤的理化特性（schroeder1974;Van Diest,1978）。一般地... 详细信息

施钾对茶树的效应大小主要取决于主导土壤中钾素的状态,土壤满足不同年龄、不同生长势、不同产量的茶树对钾素需要的能力。无论土壤本身含有的钾还是外施的钾,其持续效力决定于土壤的理化特性（schroeder1974;Van Diest,1978）。一般地,土壤中K+的动态可表示如下: 非交换性K+交换性钾土壤溶液中的K+植物体中的K+。上面的动态图表明:土壤溶液中的K+与土壤固态K+的反映是可逆的,这说明土壤矿质既是K+源,又是K+库。至于矿质,将K+保

关键词：茶树施钾量第一年茶丛反应

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synthesis and characterization of Nd^(3+)-doped Ce_(0.6)Zr_(0.4)O_(2) and its doping significance on oxygen storage capacity

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Rare Metals 2021年第1期40卷 231-236页

作者： natesan shanmuga Priya Chandramohan somayaji s.Kanagaraj siddaganga Institute of Technology TumkurKarnataka 572103India Indian institute of Technology Guwahati 781039India

Cerium and cerium-based oxides are found to be an important element in three-way catalytic converter(TWC).The effective utilization of TWC is found to be reduced due to thermal loading which results in structural deformation of ceria,Doping Zr^(4+)into the rare earth element can increase the oxygen storage capacity and thermal ***,an attempt was made to study the oxygen storage capacity and thermal stability of ceria by doping Zr^(4+)and Nd^(3+).Cerium-based nanocrystallite in the composition of Ce_(0.6)Zr_(0.4-x)Nd_(1.3)xO_(2)(0≤x≤0.4)was prepared by sol-gel synthesize technique with citric acid as a gel-forming agent.X-ray diffraction(XRD)result shows that doping Nd^(3+)into ceria lattice forms homogenous solid solution of cubic fluorite structure up to 25%of substitute *** higher amount of Nd^(3+)into ceria lattice leads to the formation of Nd_(2)O_(3).Raman spectrum study confirms that oxygen storage capacity band is present in Ce_(0.6)Zr_(0.4)O2 and Ce_(0.6)Zr_(0.3)Nd_(0.13)O_(2).The oxygen storage capacity was calculated through weight loss of the sample during the second heating cycle with cyclic heating from30 to 800℃in thermogravimetric analysis(TGA).The TGA study reveals that the oxygen storage capacity of Ce_(0.6)Zr_(0.4)O2 decreases after the substitution of Nd^(3+),which is due to the larger ionic radius of Nd^(3+)compared with that of Zr4+and CeO2.

关键词： Cerium oxide sol-gel technique Thermogravimetric analysis Ionic radius Homogeneous solid solution Oxygen storage capacity

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Uniform Convergence Analysis of Finite Difference scheme for singularly Perturbed Delay Differential Equation on an Adaptively Generated Grid

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Numerical Mathematics(Theory,Methods and Applications) 2010年第1期3卷 1-22页

作者： Jugal Mohapatra srinivasan natesan Department of Mathematics Indian Institute of Technology GuwahatiGuwahati-781 039India

Adaptive grid methods are established as valuable computational technique in approximating effectively the solutions of problems with boundary or interior layers. In this paper,we present the analysis of an upwind scheme for singularly perturbed differential-difference equation on a grid which is formed by equidistributing arc-length monitor *** is shown that the discrete solution obtained converges uniformly with respect to the perturbation *** experiments illustrate in practice the result of convergence proved theoretically.

关键词： singular perturbation problems delay differential equations boundary layer upwind scheme adaptive mesh uniform convergence.

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Transient Evolution of Inter Vessel Gap Pressure Due to Relative Thermal Expansion Between Two Vessels

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Journal of Thermal science 2002年第3期11卷 220-225页

作者： K.natesan P.selvaraj P.Chellapandi s.C.Chetal Mechanics and Hydraulics Division Indira Gandhi Centre for Atomic Research Kalpakkam India

In a typical liquid metal cooled fast breeder reactor (LMFBR), a cylindrical sodium filled main vessel, which carries the internals such as reactor core, pumps, intermediate heat exchangers etc. is surrounded by another vessel called safety vessel. The inter vessel gap is filled with nitrogen. During a thermal transient in the pool sodium, because of the relative delay involved in the thermal diffusion between MV and sV, they are subjected to relative thermal expansion or contraction between them. This in turn results in pressurisation and depressurisation of inter vessel gap nitrogen respectively. In order to obtain the external pressurization for the buckling design of MV, transient thermal models for obtaining the evolutions of MV, sV and inter gap nitrogen temperatures and hence their relative thermal expansion and inter vessel gap pressure have been developed. This paper gives the details of the mathematical model, assumptions made in the calculation and the results of the analysis.

关键词： transient thermal calculation relative thermal expansion LMFBR Runga Kutta method.

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Mechanical property and biocompatibility of co-precipitated nano hydroxyapatite-gelatine composites

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Journal of Advanced Ceramics 2015年第3期4卷 237-243页

作者： Huirong LE Kiruthika natesan sundaram PRANTI-HARAN school of Marine science and Engineering Plymouth UniversityUnited Kingdom Peninsular schools of Medicine and Dentistry Plymouth UniversityUnited Kingdom school of Engineering Physics and MathematicsUniversity of DundeeUnited Kingdom

Uniform and well dispersed nano hydroxyapatite(HA)-gelatine composites were obtained by co-precipitation of hydroxyapatite and denatured calf skin *** process allowed much higher concentration of hydroxyapatite to be produced over conventional hydrothermal process to improve the *** effect of gelatine on the morphology,mechanical properties,and biocompatibility of hydroxyapatite particles was *** cell tests of the consolidated hydroxyapatite-gelatine composites showed that the composites have excellent biocompatibility.

关键词： biomaterials nanocomposites hydroxyapatite(HA) gelatine biocompatibility

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An alternative treatment process for upgrade of petroleum refinery wastewater using electrocoagulation

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Petroleum science 2013年第3期10卷 421-430页

作者： Dhorgham skban Ibrahim Mohan Lathalakshmi Appusamy Muthukrishnaraj natesan Balasubramanian Department of Chemical Engineering AC Tech Campus Anna UniversityChennai 600025 India Department of Petroleum Engineering College of Engineering University of BaghdadIraq

An electrocoagulation treatment process was developed for treatment and upgrade of petroleum refinery effluent （wastewater）, instead of the conventional methods, which can consume higher amounts of chemicals and produce larger amounts of sludge. The effect of the operation parameters, such as current density, initial pH, anode material, anode dissolution, energy consumption and electrolysis time, on treatment efficiency was investigated. The experimental results showed that the effluent can be effectively treated under optimal conditions. Fourier transform infrared （FTIR） analysis of the effluent, and scanning electron microscopy （sEM） coupled with energy dispersive analysis of X-rays （EDAX） of the sludge produced, revealed that the unwanted pollutants can be eliminated. The electrocoagulation treatment process was assessed by using the removal efficiency of chemical oxygen demand （COD）, total suspended solids （Tss）, and the general physicochemical characteristics of wastewater, and the results showed that the electrocoagulation is an efficient process for recycling of petroleum wastewater; it is faster and provides better quality of treated water than the conventional methods.

关键词： COD/Tss reduction electrocoagulation petroleum refinery effluent recycle sludge analysis.

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