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Behavior of an indigenously fabricated transferred arc plasma furnace for smelting studies

Plasma Science and Technology 2018年第3期20卷 136-145页

作者： A k MANDAL R k DISHWAR O P SINHA Department of Metallurgical Engineering IIT(BHU)

The utilization of industrial solid waste for metal recovery requires high-temperature tools due to the presence of silica and alumina, which is reducible at high temperature. In a plasma arc furnace, transferred arc plasma furnace（TAP） can meet all requirements, but the disadvantage of this technology is the high cost. For performing experiments in the laboratory, the TAP was fabricated indigenously in a laboratory based on the different inputs provided in the literature for the furnace design and fabrication. The observed parameters such as arc length, energy consumption, graphite electrode consumption, noise level as well as lining erosion were characterized for this fabricated furnace. The nitrogen plasma increased by around 200 k（200 ℃） melt temperature and noise levels decreased by ~10 d B compared to a normal *** plasma offered 100 k（100 ℃） higher melt temperature with ~5 d B higher sound level than nitrogen plasma. Nitrogen plasma arc melting showed lower electrode and energy consumption than normal arc melting, whereas hydrogen plasma showed lower energy consumption and higher electrode consumption in comparison to nitrogen plasma. The higher plasma arc temperature resulted in a shorter meltdown time than normal arc with smoother arcing. Hydrogen plasma permitted more heats, reduced meltdown time, and lower energy consumption, but with increased graphite consumption and crucible wear. The present study showed that the fabricated arc plasma is better than the normal arc furnace with respect to temperature generation, energy consumption, and environmental friendliness. Therefore, it could be used effectively for smelting-reduction studies.

关键词： smelting transferred arc plasma furnace characterization hydrogen and nitrogen plasma hollow electrode graphite and magnesite lining

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Evaluation of particle packing models by comparing with published test results

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Particuology 2014年第5期12卷 108-115页

作者： k.W.Chan A.k.H.kwan Department of Civil Engineering The University of Hong Kong

The existing particle packing density models each with two or more parameters accounting for certain particle interactions （the loosening effect parameter, wall effect parameter, wedging effect parameter, and compaction index, denoted by a, b, c, and k, respectively） may be classified into the 2-parameter model （with a and b incorporated）, the compressible model （with a, b, and 1（incorporated）, and the 3- parameter model （with a, b, and c incorporated）. This paper evaluates these models by comparing their respective packing density predictions with the test results published in the literature. It was found that their accuracy varies with both the size ratio and volumetric fractions of the binary mix. In general, when the size ratio is larger than 0.65, all the packing models are sufficiently accurate. However, when the size ratio is smaller than 0.65, some of them become inaccurate and the errors tend to be larger at around the volumetric fractions giving maximum packing density. Relatively, the 3-parameter model is the most accurate and widely applicable.

关键词： Packing density Particle packing models Particle interactions

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Evaluation of flocculation characteristics of kaolinite dispersion system using guar gum:A green flocculant

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International Journal of Mining Science and Technology 2019年第5期29卷 745-755页

作者： R.k.Dwari B.k.Mishra Mineral Processing Department CSIR-Institute of Minerals and Materials TechnologyBhubaneswar 751013India Indian Institute of Technology Goa 403401India

This paper reports the systematic investigation on the flocculation,sedimentation and consolidation characteristics of kaolinite using guar gum as a green ***-situ flocculation behavior of kaolinite at various pH,guar gum dosages,and ionic strength were studied using a light scattering *** effect of these parameters on the settling rate,solid consolidation,and supernatant liquid clarity was *** morphology of kaolinite and flocculated kaolinite aggregates were analyzed using *** morphology studies suggest that it is poorly crystalline with multiple steps on edge,broken edge;laminar with high aspect ratio and have rough basal *** complex irregularity on the basal surface and the presence of multiple steps in the edges,broken edges(hydroxyl groups)have facilitated the guar gum *** isoelectric point of kaolinite is pH *** pH,ionic strength and flocculant dosage have a significant effect on the kaolinite settling *** guar gum has exhibited excellent turbidity removal efficiency at pH *** turbidity removal is inefficient at pH ***,guar gum has shown high turbidity removal with 80%transmission at pH 10 in the presence of a kNO3 electrolyte.

关键词： Guar gum Dewatering kaolinite Light scattering Morphology Flocculation

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POLY(METHYL METHACRYLATE)/SOY PROTEIN GREEN COMPOSITES AS GAS BARRIER MATERIALS

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Chinese Journal of Polymer Science 2012年第3期30卷 397-404页

作者： Sudhir k.kisku Sarat k.Swain Department of Chemistry North Orissa UniversityTakatpurBaripada-757003India Department of Chemistry Veer Surendra Sai University of TechnologyBurlaSambalpur-768018India

Poly（methyl methacrylate）/soy protein （PMMA/SP） composites were prepared by emulsion polymerization method using potassium persulphate （kPS） as the radical initiator. The interaction of soy protein with PMMA was evidenced by Fourier transformed infrared （FTIR） spectroscopy. The structure of PMMA/SP composite： was investigated by X-ray diffraction （XRD） study and scanning electron microscopy （SEM）. The thermal properties of soy protein and PMMA/SP composites were compared with soy protein and virgin PMMA sample. PMMA/SP composites were found to be flame retardant materials from the measurement of limiting oxygen index （LOI） of samples. The oxygen permeability of PMMA/SP composites was substantially decreased as compared to virgin PMMA.

关键词： Soy protein Emulsion polymerization Biodegradability Oxygen permeability.

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Influence of Various Parameters on Collapse Behaviour of Thin Cylinders

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上海交通大学学报 2004年第Z2期38卷 1-7页

作者： N k Gupta Applied Mechanics Department ⅡT Delhi India - 110016

Axial compression experiments on as received aluminum tubes and tubes with wall thickness eccentricity incorporated by off centre machining showed that the eccentricity caused transition of their collapse mode from axisymmetric to diamond. The numerical simulation of the collapse phenomenon was undertaken using a static non-linear Finite Element Analysis in ANSYS, and results are found to compare well with the experimental load compression and energy absorption responses for axisymmetric concertina and non-axisymmetric diamond modes. Having validated the numerical model with experiments, it has been used to undertake a systematic study of the load - compression characteristics and collapse mode transitions of the tubes with varying eccentricities in wall thickness and boundary conditions, as well as the material properties.

关键词： thin tube collapse thickness eccentricity ANSYS axial compression

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Characteristics of horizontal ground motion measures along principal directions

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Earthquake Engineering and Engineering Vibration 2010年第1期9卷 9-22页

作者： k.Goda Department of Civil and Environmental Engineering University of Western Ontario

Ground motion records are often used to develop ground motion prediction equations （GMPEs） for a randomly oriented horizontal component, and to assess the principal directions of ground motions based on the Arias intensity tensor or the orientation of the major response axis. The former is needed for seismic hazard assessment, whereas the latter can be important for assessing structural responses under multi-directional excitations. However, a comprehensive investigation of the pseudo-spectral acceleration （PSA） and of GMPEs conditioned on different axes is currently lacking. This study investigates the principal directions of strong ground motions and their relation to the orientation of the major response axis, statistics of the PSA along the principal directions on the horizontal plane, and correlation of the PSA along the principal directions on the horizontal plane. For these, three sets of strong ground motion records, including intraplate California earthquakes, inslab Mexican earthquakes, and interface Mexican earthquakes, are used. The results indicate that one of the principal directions could be considered as quasi-vertical. By focusing on seismic excitations on the horizontal plane, the statistics of the angles between the major response axis and the major principal axis are obtained; GMPEs along the principal axes are provided and compared with those obtained for a randomly oriented horizontal component; and statistical analysis of residuals associated with GMPEs along the principal directions is carried out.

关键词： Arias intensity attenuation relation bi-directional seismic excitation ground motion prediction equation principal direction pseudo-spectral acceleration response axis

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Improvement in Production Yield of Hot-rolled Coil by Controlling Process Cobbles

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Journal of Iron and Steel Research International 2016年第10期23卷 1035-1043页

作者： k.CHAkRAVARTY Department of Research and Development Tata Steel Ltd.

The yield is dependent upon many factors,such as cobbles,total scrap generation,crop loss and scale *** appears that the huge quantity of scale is mainly responsible for the yield ***,by the correlation study,it reveals that the number of cobbles is the major contributor to the yield *** innovation lies in changing the focus of attacking the real problem by analysing the operating data which was not surfaced *** focus shifted from the furnace to the mill and the cobbles studied through the years *** the analysis proved to be helpful for the future prevention of the similar kind of *** internal target of bringing down the number of cobbles per month in single digit was *** also helped in improving the maintenance practice and reducing the amount of delays *** yield was improved by 0.93%.

关键词： hot-rolled coil yield cobble scale loss finishing mill correlation

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Microbial aspects of acid mine drainage and its bioremediation

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中国有色金属学会会刊：英文版 2008年第6期18卷 1352-1360页

作者： k.A.NATARAJAN Department of Materials Engineering Indian Institute of Science

象从一些被孤立的 Acidithiobacillus ferrooxidans， Acidithiobacillus thiooxidans 和 Leptospirillum ferrooxidans 那样的 chemolithotrophs 的角色放弃了矿并且在酸矿排水和有毒的金属溶解的产生处理了废物跟踪被讨论。酸形成和从铜，铅锌和忍受毒砂的硫化物矿石和跟踪的铜，锌，铁和砷的溶解的机制面对细菌的 Acidithiobacillus 组被建立。从上述矿地点孤立的硫酸盐减少细菌(SRB ) 能被用来猛抛溶解金属象铜，锌，铁和砷那样。砷 bioremediation 通过本国的微生物的使用被表明如此的 Thiomonas spp。它能氧化亚砷酸盐到砷酸盐。通过 jarosite 的使用的砷的 Bioremoval 猛抛由 Acidithiobacillus ferrooxidans 产生了， Leptospirillum ferrooxidans 也被发现很有效。Biotechnological 过程在酸矿排水和象铜，锌和砷那样的有毒的金属离子的有效移动的补习保持大诺言。

关键词：酸矿排水生物治疗砷含量硫酸盐硫化物沉淀

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Nitrous oxide emissions in nonflooding period from fallow paddy fields

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Journal of Environmental Sciences 2008年第11期20卷 1335-1340页

作者： Hari k Pant Department of Environmental Geographic and Geological Sciences Lehman College of the City University of New York250 Bedford Park Blvd WestBronxNY 10468US

The study was conducted to investigate the N2O emissions and dissolved N2O in the leachate during the nonflooding period in nongrowing paddy *** kinds of paddy soils were repacked to soil columns and were supersaturated with water initially and dried gradually in a greenhouse to attain the N2O emissions flux during the *** with the texture of silty clay-loam (Q and H) produced cracks during the drying of soil,but soil with the texture of silty loam (X) did not form the *** s...

关键词： nitrous oxide emission cracks soil drying paddy soil

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Event-Triggered Sliding Mode Control for Trajectory Tracking of Nonlinear Systems

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 307-314页

作者： Aquib Mustafa Narendra k.Dhar Nishchal k Verma Department of Electrical Engineering Indian Institute of Technology KanpurUP 208016India

In this paper, an event-triggered sliding mode control approach for trajectory tracking problem of nonlinear input affine system with disturbance has been proposed. A second order robotic manipulator system has been modeled into a general nonlinear input affine system. Initially, the global asymptotic stability is ensured with conventional periodic sampling approach for reference trajectory tracking. Then the proposed approach of event-triggered sliding mode control is discussed which guarantees semi-global uniform ultimate boundedness. The proposed control approach guarantees non-accumulation of control updates ensuring lower bounds on inter-event triggering instants avoiding Zeno behavior in presence of the disturbance. The system shows better performance in terms of reduced control updates, ensures system stability which further guarantees optimization of resource usage and cost. The simulation results are provided for validation of proposed methodology for tracking problem by a robotic manipulator. The number of aperiodic control updates is found to be approximately 44% and 61% in the presence of constant and time-varying disturbances respectively.

关键词： Event-trigger inter execution time stability sliding mode control trajectory tracking

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