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Search Results: 1 - 10 of 262232 matches for " B.K. Mohapatra "
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Upgradation of Low-Grade Siliceous Manganese Ore from Bonai-Keonjhar Belt, Orissa, India  [PDF]
P.P. Mishra, B.K. Mohapatra, K. Mahanta
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.81005
Abstract: The low-grade siliceous manganese ores from Bonai-Keonjhar belt, Orissa, India was mineralogically characterized and investigated for their possible upgradation. Different physical beneficiation techniques like gravity, magnetic separation etc. were employed and results reported. The results reveal that a feed having 26% Mn could be upgraded to more than 45% Mn by using a dry belt type magnetic separator with 69% recovery at 1.00 tesla magnetic intensity at finer sizes.
Apatite Microstructure and Composition in Manganese Formation of Eastern Ghats, Orissa, India  [PDF]
Subhasmita Jena, B.K. Mohapatra, P. P. Singh
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.105030
Abstract: Apatite grains in a stratabound manganese ore body from Eastern Ghats in Leliguma, Koraput district south Orissa, India were studied under optical and electron microscope. Apatite shows bimodal occurrence: one associated with granite/pegmatitic phase and other with manganese phase, and exhibits different microstructure and composition. Apatite in pegmatitic association (occurring as inclusion in quartz and feldspar) is small in size and occurs as subhedral grains having irregular boundaries and poor in manganese content (MnO: 0.16%). Apatite associated with manganese mineral phases (cryptomelane / romanechite) is mostly euhedral, relatively larger in size, contains higher manganese value, and exhibits some peculiar features like twinning, zoning, overgrowth, and occasionally contains inclusion of quartz and feldspar grains. Apatite grains occurring as inclusions within quartz and feldspar are of hydrothermal origin and formed along with pegmatitic minerals. Such apatite is almost devoid of manganese but relatively enriched in Sr, F and LREE content. The apatite in manganese mineral association formed during supergene process. The apatite of latter generation appears as idiomorphic crystals; contains up to 6.85% of MnO in solid solution and shows relatively higher HREE values. The higher HREE values may be due to its derivation from stratiform Mn-ore bodies and associated granitised rock during remobilization, solution and precipitation of Mn –rich fluid along structurally weak planes resulting in development of a stratabound ore body.
The Effect of Heat Treatment on Titania Slag  [PDF]
S. Samal, B.K. Mohapatra, P.S. Mukherjee
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.99057
Abstract: The paper embodies the influence of thermal treatment on the morphology, composition and leaching behaviour of titania slag. When Ti-slag was subjected to heat treatment, it developed pores and oxidized at high temperature. This slag consists mainly of a M3O5 phase with an orthorhombic structure. The decrepitation was studied by oxidizing the titania slag sample produced in a pot/muffle furnace at temperature 750℃. Sample oxidized at 750℃ cracked while sample treated at further high temperature did not show any cracking. The cracking of the samples was linked to decrepitation of the slags which is evidenced from the development of pores in the surface of the sample. From the available information it is postulated that cracks occurs due to change in the crystal lattice of the M3O5 phase of the slag after oxidation. The present study is directed to a process for the upgrading of titania slags into a product having a very high TiO2 content with low levels of alkaline-earth and other impurities.
Pb(II), Cd(II) and Zn(II) adsorption on low grade manganese ore
K. Rout,M. Mohapatra,B.K. Mohapatra,S. Anand
International Journal of Engineering, Science and Technology , 2009,
Abstract: Low grade manganese ore (LMO) of Orissa containing 58.37% SiO2, 25.05% MnO2, 8.8% Al2O3, and 5.03% Fe2O3 as the main constituents was taken to study its adsorption behaviour for Pb(II), Cd(II) and Zn(II) from aqueous solutions. The XRD studies showed the crystalline phases to be quartz, β-MnO2, -MnO2 and Fe2O3. Batch adsorption studies were carried out by varying the experimental parameters which included contact time, pH, adsorbate and adsorbent concentrations and temperature. The time data fitted well to pseudo second order kinetics for Pb(II), Cd(II) and Zn(II) adsorption. With the increase in adsorbent dose, loading capacities decreased. With the increase in pH from 2.0 to 5.5, Pb(II) adsorption increased while Cd(II) and Zn(II) adsorption increased till an initial pH of 3.0. Positive ΔH° values confirmed the adsorption process to be endothermic and positive ΔS° values suggest the increased randomness at the solid-solution interface during the adsorption of cations on the sample. The adsorption data showed good fit to both Langmuir and Freundlich isotherm models for the three cations. The Langmuir monolayer capacities for Pb(II), Cd(II) and Zn(II) were estimated to be ~142.85, 59.17 and 98.0 mg per gram of LMO sample respectively. From the XRD studies of loaded samples, it was observed that Pb((II) adsorption affects silica phase whereas Cd(II) adsorption affects both silica and β-MnO2 phases. With Zn(II) adsorption both the intensity and peak position of silica phase were disturbed. From the electron probe micro analysis (EPMA) it was observed that Pb(II), Cd(II) and Zn(II) adsorption are more prone to silica, iron oxide and β-MnO2 phase respectively though their distribution in other phases was also marked but to a lesser extent. Due to high loading capacities obtained for Pb(II) and Zn(II), low grade manganese ore can be regarded as a potential adsorbent for these metals.
Zooplankton diversity of two floodplain lakes (pats) of Manipur, northeast India
Sharma, B.K.
Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis , 2011,
Abstract: Plankton samples collected (November, 2002 – October, 2004) from Waithou and Utra pats, two floodplain lakesin Manipur state of northeast India, revealed species rich zooplankton (121 species) with diverse nature of Rotifera (75 species).The individual pats exhibited rich species diversity (110 and 103 species) and high monthly richness (68±7 and 61±8 species)respectively with higher community similarities. Zooplankton formed important quantitative component (56.0±4.3 % and55.1±5.1 %) of net plankton of the two pats; Rotifera dominantly contributed to their abundance while Cladocera > Copepodawere sub-dominant groups. The richness and abundance showed significant variations between pats and between months andfollowed oscillating annual patterns in each pat except for peaks during winter. Zooplankton indicated higher species diversityand evenness, lower dominance, lack of quantitative importance of individual species, low densities and equitable abundance ofthe majority of species in both pats. The richness correlated inversely only with nitrate in Waithou pat and abundance positivelycorrelated with alkalinity only in Utra Pat. Canonical correspondence analysis (CCA) with abiotic factors explained 55.6 % and61.8% cumulative variance of zooplankton assemblages of Waithou and Utra pats respectively along axis 1 and 2.
B.K. Ravi
Academic Research International , 2012,
Abstract: For healthy, meaningful, harmless, non-interfering and contributive functioning with maximized benefits, every media theory has reiterated that the intricacies of media practices should essentially be compatible with the social structure, cultural ethos and psycho-social ramifications of the land and the region. However, the practices currently adopted are more often borrowed or imitative of the extraneous, foreign and strange to be deciphered and accepted, especially in a nation like India. In such a context, mass media has constantly been lured into overstepping the fire line of informing,educating or entertaining the public. The habits and practices of media have time and again often resulted in sensationalizing, misleading, instigating or giving ulterior ideas leading to mistakes,triggering catastrophe or toppling governance established by law. The trend is also trickling down to the domestic media. The study looks into many such deviations in compatible practices, instances andcase studies and their repercussions on society as well as on media itself. The study analyses and tries to provide for alternative healthy practices, at least put them into theory to begin with, with ahope that the stakeholders will introspect and imbibe the essence of a disciplined approach to the functioning of media. This study has its significance as more and more types of media are joining the train of existing media while the relationship between them and the people has got entangled and often conflicting to each other as the fundamentals of media functioning seems to have got blurred in this convergence era. The methodology is of theoretical type with Critical Study along with case studies and observations. The findings of the study reveal the relationship between the commercial aspects of media, theoretical model, ethical lines and the psycho-social aberrations resulting out of wrongly treaded paths by the media. The inferences concentrate on treating the culture of mass media with innovative penicillin. The conclusions of the study are derived purely for the intentions ofbridging the gap of understanding between the common masses and the specialized sector called mass communication.
Precision of helicopter-based total-area counts of large ungulates in bushveld
B.K. Reilly
Koedoe : African Protected Area Conservation and Science , 2002, DOI: 10.4102/koedoe.v45i2.33
Abstract: Precision in helicopter total-area counts in bushveld for a range of common species are evaluated. Counts were conducted on properties ranging in size from 250 ha to 10 000 ha as part of experiments on precision and power. Counts were conducted in three vegetation types: mopane veld, sourish mixed bushveld and arid bushveld. Scant regard is given to precision as a factor in large herbivore monitoring, with more effort often devoted to accuracy. Coefficients of variation varied from 3.2 % to 70.9 %. Median values are generally acceptable for the establishment of trends for long-term monitoring, but might be inadequate for annual population size monitoring and evaluation. A regression of all species and vegetation types by the standard error showed a significant correlation. Similar regressions were also developed for impala, kudu, warthog, and zebra. Regressions by vegetation type for mopane veld, sourish mixed bushveld, and northwest arid bushveld were also significant. However, the high correlation for some vegetation types might be an artifact of the small sample sizes.
B.K. Ravi
Academic Research International , 2012,
Abstract: Usage of languages in media plays a significant role in making people to initiate and set agenda for the generation next. The positive aspects of media in producing cultural enrichment more often than not overshadow the pitfalls accompanying it. As communication expert, Wilbur Schramm says, ‘no mass media can exist in a cultural vacuum’. After language based unification of states in India, in the absence of clear-cut Communication Policy, unilingual influences dominated in the country. Limitations of media practitioners and technology contributed to the linguistic divide. The rural dialects and art forms were started to decline due to the presence of urban professionals inside media houses. The entry of global media houses also led to the better technological advancement in media and entertainment business. Commercial media houses also started dictating the language component; as a result writing and reading habits of younger generation is fast disappearing. Since the media has the capability to make people imitate, whatever language practices are on the media, the media consumers quickly pick them up. Researchers have often overlooked the potential to study language usages in media. In the convergence era with dominating mobile phones and SMS usages, the situation has still worsened. Transnational media has subtly started imposing English on a conventional society, negatively affecting the youth. In view of the situation, there is an urgent need to save many of the endangered languages. In this background, this article critically evaluates the pitfalls of non-judicious adaptations of language usages overelectronic media. The inferences drawn calls for major changes in media language practices.
Growth and yield performance of shingi, Heteropneustes fossilis and koi, Anabas testudineus in Bangladesh under semi-intensive culture systems
B.K. Chakraborty
International Journal of Agricultural Research, Innovation and Technology : IJARIT , 2012,
Abstract: Production potential of shingi, Heteropneustes fossilis and koi, Anabas testudineus in polyculture were assessed at a stocking density of 2, 47,000 and 3, 70,500 ha-1, respectively in treatment T1 and T2. Monoculture of H. fossilis and A. testudineus was designed at a stocking density of 2, 47,000 ha-1 in treatment T3 and T4, respectively. Culture period of shingi was 120 days and koi was 100 days in all treatments. All fingerlings were of the same age at stocking, with a mean weight of 2.54±0.08 g for shingi and 0.50±0.01 g for koi, respectively. Commercial fish feeds (30.0% crude protein) supplied at the rate of 100 to 5% of total biomass twice daily. Fish production in treatment T1, T2, T3 and T4 were 18,803±111, 12,388±115, 10,042±5 kg ha-1 day-120 and 22,176±7 kg ha-1 day-100, respectively. The feed conversion ratio (FCR) was significantly (P<0.05) lower in T4 than that of the other three treatments. The net financial benefits incurred from treatment T1, T2, T3 and T4 were Bangladeshi Taka 17,65,769; 6,691; 15,83,990 and 16,29,409 BDT ha-1, respectively. The mean differences of gross yields and net benefits among different treatments were significant (P<0.05). The polyculture technology of shingi and koi, and monoculture technology of koi may help to meet the dietary needs and improve the socio-economic status of the people of Bangladesh.
An Experimental Study on Mechanical and Fracture Behavior of Phosphoric Iron  [PDF]
A. K. Vishnoia, B.K. Mishra, S. Prakash
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.912079
Abstract: Phosphoric iron of two different phosphorus content, namely P1 (Fe-0.30P-0.226C), P2 (Fe-0.11P-.028C) were first prepared by ingot casting route. The ingot were soaked and forged at 1150℃. The microstructures of the phosphoric iron and its relevant mechanical properties such as hardness and tensile properties have been characterized. J-R curves of the material have been determined at room temperature. Fracture behaviour under tearing load has been studied through fracture toughness tests on phosphoric iron using Compact Tension (CT) specimens of Width (W) =50 mm and thickness (B) =12.5mm. J-R curves were obtained from specimens precracked to a/W = 0.5 .The single specimen unloading compliance method have been used for generating J-R curves.
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