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Search Results: 1 - 10 of 263692 matches for " B.K.Mishra "
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Two Dimensional Modeling of Nonuniformly Doped MESFET Under Illumination
B.K.Mishra,Lochan Jolly,Kalawati Patil
International Journal of VLSI Design & Communication Systems , 2010,
Abstract: A two dimensional numerical model of an optically gated GaAs MESFET with non uniform channel doping hasbeen developed. This is done to characterize the device as a photo detector. First photo induced voltage (Vop) atthe Schottky gate is calculated for estimating the channel profile. Then Poisson’s equation for the device issolved numerically under dark and illumination condition. The paper aims at developing the MESFET 2-Dmodel under illumination using Monte Carlo Finite Difference method. The results discuss about the opticalpotential developed in the device, variation of channel potential under different biasing and illumination andalso about electric fields along X and Y directions. The Cgs under different illumination is also calculated. Ithas been observed from the results that the characteristics of the device are strongly influenced by the incidentoptical illumination.
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.
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.
Performance Evaluation of UWB Wireless Link
Joanne Gomes,B.K. Mishra
International Journal of Information and Network Security (IJINS) , 2012, DOI: 10.11591/ijins.v1i3.722
Abstract: An Ultra wideband technology played an important role in home networks to facilitate the transmission of multimedia contents between two consumer devices using wireless USB. This paper investigated the performance of UWB Transmitter-Receiver system, based on 2-dimensional hermite modulation, in view of its practical implementation. Performance of the UWB system was evaluated here with a cost effective and simple receiver structure, for short distance communication of 4 meters, by limiting the transmitter power, to maintain the Effective Isotropic Radiated Power (EIRP) of -41.3dBm/MHz as per FCC rule for UWB radio. The performance of the said system was also analyzed for different data rates using different sampling frequencies over multipath UWB channel, with and without the use of error correcting code. Simulations were performed in MatLAb Simulink for single user, for the image transmission application, as an extension to the previous work. System BER of 10e-5 was required to receive an image with 100% accuracy at the receiver end. It was observed that over UWB channel, at 10 GHz sampling rate, with 1.5 ns pulse width and with 10dBm transmission power, an image was received accurately at symbol SNR of 35dB without ECC and that of 12dB with (8 2 5) double error correcting code, of code rate designed in earlier work. The simulation results presented in this paper support the future implementation of UWB system that is cheaper and simpler for better performance.
Panda B.K,Patro V.J,Mishra U.S,Panigrahi B.K
International Journal of Research in Ayurveda and Pharmacy , 2011,
Abstract: Spondias Pinnata (Linn.F) Kurz is found in tribal area of Mayurbhanj district and extensively used traditionally by the tribal people as Anthelmintic, Anti-inflammatory, Regulate menstruation, Anti-pyretic, Anti-tumor and Anti-bacterial activity1-6. The present study is attempted to explore the anthelmintic activity of acetone and ethanol extract of bark of plant Spondias Pinnata in a comparative study. The various doses of acetone and ethanol extracts were evaluated for their anthelmintic activities on adult Indian earthworms, Pheretima postuma. All extracts of both the solvents were able to show anthelmintic activity at (10, 25, 50 and 100 mg/ml) concentration. The activities are well comparable with standard drugs, Piperazine citrate and Albendazole (10 mg/ml).All the doses of acetone and ethanol extract of Spondias Pinnata showed better anthelmintic activities than the standard drugs. When the dose of extract is increased, a gradual increase in anthelmintic activity was observed. Ethanol extract showed better anthelmintic activity in comparison to the acetone extract of Spondias Pinnata. The data was verified as statistically significance by using ANOVA at 5% level of significance (P< 0.05).
Simultaneous Saccharification and Fermentation of Overnight Soaked Sweet Potato for Ethyl Alcohol Fermentation
S.R. Purohit,B.K. Mishra
Advance Journal of Food Science and Technology , 2012,
Abstract: The aim of the study is to develop an efficient method of production of ethyl alcohol by fermentation of sweet potato powder. The method emphasized on enhancement of "-amylase accessibility by overnight soaking of sweet potato powder and decreasing unwanted bacterial fermentation by utilizing simultaneous saccharification and fermentation. The crystalline structure of starch limits the accessibility of "-amylase to starch during enzymatic hydrolysis and thus reduces hydrolysis rate. This might be the reason for longer hydrolysis time. Effect of overnight soaking in water on eight variety of sweet potato was investigated followed by Simultaneous Saccharification and Fermentation (SSF). The result reflected the advantage of overnight soaking on "-amylase accessibility to starch, which favor higher hydrolysis rate. Implementing SSF, the fermentation process become efficient due to less free sugar at an instant and maximum efficiency of 96.7% was achieved in a 64.65% starch containing substrate.
Cytological Studies in Asteracantha longifolia (L.) Nees-A Medicinal Herb
M. Behera,R.R. Mishra,B.K. Bindhani,J. Panigrahi
International Journal of Botany , 2010,
Abstract: The present study was accentuated upon karyotype analysis and meiotic chromosome behavior in Asteracantha longifolia (L.) Nees. The chromosome number of Astercantha longifolia (L.) Nees-a medicinal herb-found to be 2n = 2x = 32 through mitotic and meiotic analysis. Karyotype analysis revealed eight (6Am + 4Bsm+4Cst+4Dm+4Esm+4Fst+2Gt+4Hsm) morphologically distinct chromosome types. Karyotype analysis showed prevalence of chromosomes with submedian and median primary constrictions. The chromosome length varied from 1.43 to 3.32 μm. The karyotype was symmetric in nature with TF% = 32.8. Meiotic analysis showed the gametic number n = 16 consistently with an average of 15.65±0.65 II and 0.7±0.98 I. The meiocytes revealed predominance of ring bivalents (10.05±0.76) over rod bivalents (5.6±0.68), which had mostly terminalised chiasmata with terminalization coefficient of 0.89. Anaphase-I segregation showed normal 16:16 separation to two poles, although univalents in the form of laggards were often observed. Pollen stainability was 80.3±8.63% indicating the partial heterozygosity in constituent genome of A. longifolia.
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.
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