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Comparison of Velocity Shear with Turbulence Reduction Driven by Biasing in a Simple Cylindrical Slab Plasma

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Plasma Science and Technology 2010年第4期12卷 391-396页

作者： k.W.GENTLE k.LIAO k.LEE W.L.ROWAN Institute of Fusion Studies University of Texas at Austin

In an experimental realization of the sheared cylindrical slab, the level of plasma turbulence is strongly reduced by application of a sufficient bias potential difference in the radial direction. Density fluctuation levels △nrms/n decrease by more than a factor of five. The ion flow velocity profile is measured spectroscopically from the Doppler shift of an argon ion line. Comparison of the shearing rates with the turbulent amplitudes as a function of bias show no relation between the shearing rate and turbulence reduction, contrary to expectations.

关键词： turbulence suppression shear stabilization velocity shear bias

Effect of Welding Processes on Tensile and Impact Properties,Hardness and Microstructure of AISI 409M Ferritic Stainless Joints Fabricated by Duplex Stainless Steel Filler Metal

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Journal of Iron and Steel Research International 2009年第5期16卷 66-72页

作者： A k Lakshminarayanan k Shanmugam V Balasubramanian Centre for Materials Joining and Research(CEMAJOR) Department of Manufacturing EngineeringAnnamalai University

The effect of welding processes such as shielded metal arc welding, gas metal arc welding and gas tungsten arc welding on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade is studied. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure and fracture surface morphology of the welded joints have been evaluated and the results are compared. From this investigatio.n, it is found that gas tungsten arc welded joints of ferritic stainless steel have superior tensile and impact properties compared with shielded metal arc and gas metal arc welded joints and this is mainly due to the presence of finer grains in fusion zone and heat affected zone.

关键词： ferritic stainless steel shielded metal arc welding gas metal arc welding gas tungsten arc welding tensile impact property

Gottfried konecny:the ambassador of photogrammetry and remote sensing for 75 years

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Geo-Spatial Information Science 2021年第1期24卷 27-32,I0006页

作者： Charles k.Toth Department of Civil Environmental and Geodetic EngineeringThe Ohio State UniversityColumbusOHUSA

A 90th birthday would be a milestone celebration for any person,but exceptionally rare if the person is still active after 75 years of working and serving the photogrammetric and remote sensing communities *** unprecedented career is the motivation to reflect on the technological developments of the past 75 years in the light of Gottfried konecny’s lifetime achievements.I started to get to know Gottfried not long before he officially retired from the Institute for Photogrammetry and Engineering Surveys in ***,I was not even born when he,as a young and talented scholar supported by the Fulbright Scholarship from the US Government,arrived at the Ohio State University(OSU),which has been my professional home for three *** the second half of Gottfried’s 75-year career,the technological changes have been phenomenal,and,furthermore,shown an accelerating trend in the past few *** is absolutely remarkable how Gottfried has been able to keep up with these rapid changes and advancing technologies and exploits them for mapping and,in general,for all the users of the geospatial field at ***,his open-minded and kind personality has been always a major plus to his technical skills and experiences,and ultimately helped him assist many colleagues to advance their careers,and along the way developed and increased the use of geospatial data and systems in support of many countries worldwide.

关键词： Photogrammetry remote sensing space observation

Hydromagnetic flow through uniform channel bounded by porous media

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Applied Mathematics and Mechanics(English Edition) 2011年第7期32卷 837-846页

作者： k.RAMAkRISHNAN k.SHAILENDHRA Department of Mathematics Sri Krishna College of Engineering and TechnologySugunapuramKuniamuthurCoimbatore 641008TamilnaduIndia Department of Mathematics Amirta School of EngineeringAmirta Vishwa VidyapeethamCoimbatore 641105TamilnaduIndia

The combined effects of the magnetic field, permeable walls, Darcy velocity, and slip parameter on the steady flow of a fluid in a channel of uniform width are studied. The fluid flowing in the channel is assumed to be homogeneous, incompressible, and Newtonian. Analytical solutions are constructed for the governing equations using Beavers-Joseph slip boundary conditions. Effects of the magnetic field, permeability, Darcy velocity, and slip parameter on the axial velocity, slip velocity, and shear stress are discussed in detail. It is shown that the Hartmann number, Darcy velocity, porous parameter, and slip parameter play a vital role in altering the flow and in turn the shear stress.

关键词： uniform channel permeable wall magnetic field slip velocitY shear stress

Generalization properties of restricted Boltzmann machine for short-range order

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Chinese Physics B 2023年第6期32卷 556-562页

作者： M A Timirgazin A k Arzhnikov Udmurt Federal Research Center Ural Branch of RASIzhevsk 426067Russia

A biased sampling algorithm for the restricted Boltzmann machine(RBM) is proposed, which allows generating configurations with a conserved quantity. To validate the method, a study of the short-range order in binary alloys with positive and negative exchange interactions is carried out. The network is trained on the data collected by Monte–Carlo simulations for a simple Ising-like binary alloy model and used to calculate the Warren–Cowley short-range order parameter and other thermodynamic properties. We demonstrate that the proposed method allows us not only to correctly reproduce the order parameters for the alloy concentration at which the network was trained, but can also predict them for any other concentrations.

关键词： machine learning short-range order Ising model restricted Boltzmann machine

Effect of Autogenous Arc Welding Processes on Tensile and Impact Properties of Ferritic Stainless Steel Joints

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Journal of Iron and Steel Research International 2009年第1期16卷 62-68,16页

作者： A k Lakshminarayanan k Shanmugam V Balasubramanian Centre of Materials Joining and Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar-608002Tamil NaduIndia

The effect of autogeneous arc welding processes on tensile and impact properties of ferritic stainless steel conformed to AISI 409M grade is studied. Rolled plates of 4 mm thickness have been used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure, and fracture surface morphology of continuous current gas tungsten arc welding （CCGTAW）, pulsed current gas tungsten arc welding （PCGTAW）, and plasma arc welding （PAW） joints are evaluated and the results are compared. It is found that the PAW joints of ferritic stainless steel show superior tensile and impact properties when compared with CCG-TAW and PCGTAW joints, and this is mainly due to lower heat input, finer fusion zone grain diameter, and higher fusion zone hardness.

关键词： ferritic stainless steel plasma arc welding continuous current gas tungsten arc welding pulsed currentgas tungsten arc welding tensile property impact property

Production of pig iron from red mud waste fines using thermal plasma technology

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International Journal of Minerals,Metallurgy and Materials 2012年第8期19卷 679-684页

作者： k. Jayasankar P.k. Ray A.k. Chaubey A. Padhi B.k. Satapathy P.S. Mukherjee CSIR-Institute of Minerals & Materials Technology Bhubaneswar India National Aluminum Company Ltd. Bhubaneswar India

Red mud, an insoluble residue produced during alkali leaching of bauxite, is considered as a low-grade iron ore containing 30% to 50% iron. The present paper deals with the use of thermal plasma technology for producing pig iron from red mud waste fines. The smelting reduction of red mud was carried out in a 35 kW DC extended arc thermal plasma reactor. Red mud was properly mixed with fluxes and graphite （fixed carbon, 99%） as a reductant as per stoichiometric requirement. The effect of various process parameters like a reductant, fluxes and smelting time on iron recovery was studied and optimized. An optimum condition for the maximum recovery of iron was obtained. A new thermal plasma process applicable to direct iron making from red mud waste fines that would achieve significant utilization of red mud was proposed.

关键词： pig iron waste utilization red mud smelting dolomite limestone thermal plasma

Hydrodynamics of three-phase fluidization of homogeneous ternary mixture in a conical conduit-Experimental and statistical analysis

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Chinese Journal of Chemical Engineering 2016年第10期24卷 1335-1343页

作者： R.k.Padhi D.T.k.Dora Y.k.Mohanty G.k.Roy B.Sarangi Department of Chemical Engineering GIETGunupur-765 022RayagadaOdishaIndia Department of metallurgical Engineering ICITSarangaDhenkanalOdishaIndia

Hydrodynamics of conical fluidized bed differ from that of columnar beds by the fact that a velocity gradient exists along the axial direction of the *** gas–liquid–solid fluidized bed has emerged in recent years as one of the most promising devices for three-phase *** a device is of considerable industrial importance as evident from its wide applications in chemical,refining,petrochemical,biochemical processing,pharmaceutical and food *** explore this,a series of experiments have been carried out for homogeneous well-mixed ternary mixtures of dolomite of varying compositions in a three-phase conical fluidized *** hydrodynamic characteristics determined included the bed pressure drop,bed fluctuation and bed expansion *** single and combined effects of operating parameters such as superficial gas velocity,superficial liquid velocity,initial static bed height,average particle size and cone angle on the responses have been analyzed using response surface methodology(RSM).A 25 full factorial central composite experimental design has been *** of variance(ANOVA) showed a high coefficient of determination value and satisfactory prediction second-order regression models have been *** values of bed pressure drop,bed fluctuation and bed expansion ratios have been found to agree well with the developed correlations.

关键词： Gas-liquid-solid fluidization Conical bed Bed pressure drop Bed fluctuation ratio and bed expansion ratio ANOVA

Tensile and Impact Properties of Shielded Metal Arc Welded AISI 409M Ferritic Stainless Steel Joints

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Journal of Materials Science & Technology 2009年第2期25卷 181-186页

作者： k. Shanmugam A.k. Lakshminarayanan V. Balasubramanian Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing Engineering Annamalai UniversityAnnamalai Nagar 608 002 Tamil Nadu India

The present study is concerned with the effect of filler metals such as austenitic stainless steel, ferritic stainless steel and duplex stainless steel on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure and fracture surface morphology of the joints fabricated by austenitic stainless steel, ferritic stainless steel and duplex stainless steel filler metals were evaluated and the results were reported. From this investigation, it is found that the joints fabricated by duplex stainless steel filler metal showed higher tensile strength and hardness compared to the joints fabricated by austenitic and ferritic stainless steel filler metals. Joints fabricated by austenitic stainless steel filler metal exhibited higher ductility and impact toughness compared with the joints fabricated by ferritic stainless steel and duplex stainless steel filler metals.

关键词： Ferritic stainless steel Shielded metal arc welding Tensile properties Impact toughness