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Experimental Investigation on the Performance of Armour grade Q&T Steel Joints Fabricated by Flux Cored Arc Welding with Low Hydrogen Ferritic Consumables

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Journal of Materials Science & Technology 2009年第5期25卷 583-591页

作者： g.Magudeeswaran V.Balasubramanian g.Madhusudhan Reddy g.gopalakrishnan Metal Joining Research Center(MJRC) Sri Ramakrishna Engineering CollegeN.G.G.O Colony-Post Centre for Materials Joining&Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai University Scientist-F Metal Joining SectionDefence Metallurgical Research Laboratory(DMRL)Kanchanbagh(P.O)

Quenched and Tempered （Q＆T） steels are widely used in the construction of military vehicles due to its high strength to weight ratio and high hardness. These steels are prone to hydrogen induced cracking （HIC） and softening in the heat affected zone （HAZ） after welding. The use of austenitic stainless steel （ASS） consumables to weld the above steel was the only available remedy to avoid HIC because of higher solubility for hydrogen in austenitic phase. Recent studies revealed that low hydrogen ferritic （LHF） steel consumables can also be used to weld Q＆T steels, which can give very low hydrogen levels in the weld deposits and required resistance against cold cracking. Hence, in this investigation an attempt has been made to study the performance of armour grade Q＆T steel joints fabricated by flux cored arc welding with LHF steel consumables. Two different consumables namely （i） austenitic stainless steel and （ii） low hydrogen ferritic steel have been used to fabricate the joints by flux cored arc welding （FCAW） process. The joints fabricated by LHF consumable exhibited superior transverse tensile properties due to the presence of ferrite microstructure in weld metal. The joints fabricated by ASS consumable showed higher impact toughness due to the presence of austenitic phase in weld metal microstructure. The HAZ softening in coarse grain heat affected zone （CgHAZ） is less in the joints fabricated using LHF consumable due to the lower heat input involved during fabrication compared to the joints fabricated using ASS consumables.

关键词： Quenched and tempered steel Flux cored arc welding process Low hydrogen ferritic steel Tensile properties

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ZnO/CdS nanocomposites:Synthesis,structure and morphology

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Particuology 2012年第6期10卷 722-728页

作者： g.Murugadoss Department of Physics Annamalai UniversityAnnamalai Nagar 608 002TamilnaduIndia

Uncoated ZnO, CdS and ZnO/CdS nanocomposites were successtully synthestzecl cnemJcally in atmo-spheric air using a water-ethanol matrix. The as-obtained samples were characterized by X-ray diffraction, transmission electron microscopy （TEM）, UV-vis and photoluminescence （PL） spectropho-tometry. The luminescence measurements ofZnO/CdS nanocomposites showed narrow and enhanced PL emission in the blue region, PL quenching was observed in ZnO/CdS nanocomposites by increasing Cd and S concentrations.

关键词： NanocompositesSurface defectQuantum confinement TEM Photoluminescence

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Some studies on transient behaviours of sheath formation in dusty plasma with the effect of adiabatically heated electrons and ions

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Plasma Science and Technology 2017年第9期19卷 35-40页

作者： g C DAS gyan Darshan Academy VIP RoadGuwahati-781022India

Based on quasipotential analysis, a plasma sheath is studied through the derivation of the Sagdeev potential equation in dusty plasma coexisting with adiabatically heated electrons and ions. Salient features as to the existence of sheaths are shown by solving the Sagdeev potential equation through the Runge–Kutta method, with appropriate consideration of adiabatically heated electrons and ions in the dynamical system. It has been shown that adiabatic heating of plasma sets a limit to the critical dust speed depending on the densities and Mach number, and it is believed that its role is very important to the sheath. One present problem is the contraction of the sheath region whereby dust grains levitated into the sheath lead to a crystallization similar to the formation of nebulons and are compressed to a larger chunk of the dust cloud by shrinking of the sheath. Our overall observations advance knowledge of sheath formation and are expected to be of interest in astroplasmas.

关键词： sheath heated dynamical Kutta Runge derivation shrinking coexisting grains compressed

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紧急避孕方法

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生殖与避孕 2006年第6期26卷 373-377页

作者： gülmezoglu am Ezcurra E vanLook PFA 陈军玲程利南机构不详

非意愿妊娠是一个常见的问题。世界上每年约有5千万例流产(van Look 1995)。对这一问题的标准解决方法一直是预防(避孕),并以人工流产作为补救。但是长期以来在世界上避孕仅仅意味着事先避孕,意外妊娠的一级预防定义应该也必须扩展到事... 详细信息

非意愿妊娠是一个常见的问题。世界上每年约有5千万例流产(van Look 1995)。对这一问题的标准解决方法一直是预防(避孕),并以人工流产作为补救。但是长期以来在世界上避孕仅仅意味着事先避孕,意外妊娠的一级预防定义应该也必须扩展到事后避孕(grimes1997)。[第一段]

关键词：紧急避孕方法人工流产一级预防非意愿妊娠事后避孕意外妊娠意味着世界

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Partition Functions for Diatomic Molecules in Plasmas out of Thermal Equilibrium

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Plasma Science and Technology 2012年第3期14卷 192-200页

作者： graldine FAURE Clermont Universit Universit Blaise PascalLAEPTBP 10448F-63000 Clermont-FerrandFrance

Two calculation methods on the partition functions for diatomic molecules in plas- mas out of thermal equilibrium are reported. A Boltzmann distribution for the electronic, vi- brational and rotational quantum levels is assumed in the two calculation methods. The results obtained by two methods are displayed for four sorts of diatomic molecules, 02, N2, OH and NO, that are present in humid air plasmas. The calculation method of density for the electronically excited states is developed. Finally, a method to calculate the partition functions for simulating the non-normalized diatomic spectra is discussed.

关键词： partition function Boltzmann distribution diatomic molecule

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Raman Scattering Study on Vibrational Modes and .Structure of Lanthanum Tellurite glasses

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Chinese Journal of Chemical Physics 2012年第5期25卷 519-525,I0003页

作者： Angelos g Kalampounias Department of Chemical Engineering University of Patras and Institute of Chemical Engineering andHigh Temperature Chemical Processes FORTH/ICE-HT P.O. Box 1414 Patras GR-26 504 Greece

Raman spectra of xLa203-（1-x）TeO2 （x=0, 0.05, 0.10, 0.15, 0.20, and 0.25） lanthanum tellurite glasses were measured and analyzed over the entire glass-forming region in an effort to quantitatively follow the structural changes caused by lanthanum oxide variation. For the first time, systematic intensity measurements have been performed to elucidate the composition induced structural changes in tile high-frequency stretching vibration region and a possible mechanism was proposed. The network structure of the glasses is formed by mixing TeO4 trigonal bipyramid and Te03 trigonal pyramid units. The change of the lanthanum oxide content results in conversion of the TeO4 units to TeO3 units with a varying number of non-bridging oxygen atoms. Analysis of the Raman band contours in terms of vibrations due to different oxygen bridged trigonal bipyramid and trigonal pyramid tellurite structural units, allowed to calculate the relative amounts of the species involved in the structural changes with composition. The fraction of the terminal oxygen atoms has been estimated from the Raman intensities with the aid of a structural model concerning the structure of tellurite network systems. The simulation of the experimental density of lanthanum tellurite glasses with modifier content up to 25% revealed that the short range order building units assumed here are sufficient to account for the overall structure in these glasses.

关键词： Tellurite glass Raman spectroscopy Short-range order Density model

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Synthesis and Characterization of Transition Metals Doped ZnO Nanorods

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Journal of Materials Science & Technology 2012年第7期28卷 587-593页

作者： g.Murugadoss Department of Physics Annamalai University

Different morphologies of undoped and transition metals （Mn, Co and Ni） doped one-dimensional （ID） ZnO nanocrystals were successfully synthesized by chemical method in an air atmosphere using polyvinylpyrrolidone （PVP） as a surfactant. The structure and optical properties were studied by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, thermal gravimetric analysis （TgA）, ultraviolet visible （UV-vis） absorption spectra and photoluminescence （PL） spectra. The doped ZnO nanorods exhibited a blue-shifted band gap and enhanced ultraviolet （UV） emission. In addition defect related emission was observed for the doped ZnO.

关键词： ZnO Luminescence Defect Transmission electron microscopy (TEM)

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Synthesis and photoluminescence properties of zinc sulfide nanoparticles doped with copper using effective surfactants

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Particuology 2013年第5期11卷 566-573页

作者： g.Murugadoss Centre for Nanoscience and Technology Anna University

Zinc sulfide （ZnS）, various concentrations of Cu2＋（0.25%-1.25%）-doped ZnS and ZnS：Cu2~ nanoparticles capped with various surfactants have been successfully synthesized by a chemical precipitation method in ambient air at 80 ~C. The synthesized particles were characterized by UV-visible absorption （UV-vis）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and Fourier transform infrared （FT-1R） and photoluminescence （PL） spectroscopy. The absorption peaks of the synthesized nanoparticles were noticeably blue-shifted from the bulk material. The XRD analysis confirmed the formation of a cubic phase for all samples. The average size of the particles ranged from 3.2 to 5.3 nm. The TEM analysis showed that the particles were highly monodispersed and spherical in shape. Particles with increased Cu2＋ concentrations had a red shift in their PL emission spectra. Enhanced PL emissions were observed for surfactant-capped particles. The experimental results indicate that, as expected, the PL spectrum confirms the presence of Cu2＋ ions in the ZnS nanoparticles.

关键词： NanoparticlesDopingSurfactantQuantum confinementRed shift

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generalized analytical solutions for certain coupled simple chaotic systems

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Chinese Physics B 2017年第5期26卷 71-81页

作者： g Sivaganesh A Arulgnanam Department of Physics Alagappa Chettiar College of Engineering & Technology Karaikudi Tamilnadu-630 004 India Department of Physics St. John's College Palayamkottai Tamilnadu-627 002 India

We present a generalized analytical solution to the normalized state equations of a class of coupled simple secondorder non-autonomous circuit systems. The analytical solutions thus obtained are used to study the synchronization dynamics of two different types of circuit systems, differing only by their constituting nonlinear element. The synchronization dynamics of the coupled systems is studied through two-parameter bifurcation diagrams, phase portraits, and time-series plots obtained from the explicit analytical solutions. Experimental figures are presented to substantiate the analytical results. The generalization of the analytical solution for other types of coupled simple chaotic systems is discussed. The synchronization dynamics of the coupled chaotic systems studied through two-parameter bifurcation diagrams obtained from the explicit analytical solutions is reported for the first time.

关键词： chaotic bifurcation normalized identical chaos exponent Pecora generalization circuits explicit

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Tomographic study of the deep tectonics in the Yecheng-Shiquanhe area of the Tibetan Plateau

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Science China Earth Sciences 2005年第4期48卷 477-483页

作者： g. Wittlinger g. Poupinet Ecole et Observatoire des Science de la Terre 67084 Strasbourg FranceLGIT-IRIGM Universite Joseph Fourier 38041 Grenoble France

The Yecheng-Shiquanhe profile runs over the western Tibetan Plateau from the south margin of the Tarim Basin, crossing the west Kunlun orogeny, to the east of Karakorum. The authors applied body waves to 3-dimensional inversion of travel time residuals and outlined the deep tectonic pattern of the northwestern Tibetan Plateau. An image was obtained, showing that the Tarim lithosphere is subducted southwards underneath the west Kunlun orogeny at an angle of 40° and a depth of 280 km. Surface structures are well expressed in the image and can be further traced in deeper levels. The prominent finding is that the gozha Fault and Karakax Fault are likely to join together beyond a depth of ～200 km, which is the very zone of active seismicity.

关键词： west Kunlun, lithosphere, velocity perturbation, subduction.

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