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Search Results: 1 - 10 of 192927 matches for " Bansi D. Pandey "
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Efficacy of Bacterial Adaptation on Copper Biodissolution from a Low Grade Chalcopyrite Ore by A. ferrooxidans  [PDF]
. Abhilash, K. D. Mehta, Bansi D. Pandey
International Journal of Nonferrous Metallurgy (IJNM) , 2012, DOI: 10.4236/ijnm.2012.11001
Abstract: A low-grade ore containing ~0.3% Cu, remains unutilized for want of a viable process at Malanjkhand Copper Project (MCP), India in which copper is present as chalcopyrite associated with pyrite in quartz veins and granitic rocks. In order to extract copper from this material, bioleaching has been attempted on bench scale using Acidithiobacillus fer-rooxidans (A. ferrooxidans) isolated from the native mine water. The enriched culture containing A. ferrooxidans when adapted to the ore and employed for the bioleaching at 5% (w/v) pulp density, pH 2.0 and 25°C with three particle sizes viz.150 -76 μm, 76 - 50 μm and <50 μm, resulted in recovery of 38.31%, 29.68% and 47.5% Cu respectively with a maximum rise in redox potential (ESCE) from 530 to 654 mV in 35 days. Under similar conditions, the unadapted strains gave a recovery of 44.0% for <50 μm size particles with a rise in ESCE from 525 to 650 mV. On using unadapted bacte-rial culture directly in shake flask at pH 2.0 and 35°C temperature and 5% (w/v) pulp density (PD) for <50 μm size par-ticles, 72% Cu bio-dissolution was achieved in 35 days. Copper biorecovery increased to 75.3% under similar condi-tions with a rise in bacterial count from 1 × 107 cells/mL to 1.13 × 109 cells/mL in 35 days. The higher bio-recovery of copper with the adapted bacterial culture may be attributed to the improved iron oxidation (Fe2+ to Fe3+) exhibiting higher ESCE as compared to that of unadapted strains.
Relationship between pterygium and lacrimation-a clinical study
Pandey D,Mishra V,Rekha,Pandey D
Indian Journal of Ophthalmology , 1983,
Abstract:
Improved Round Robin Policya Mathematical Approach
Prof . D. Pandey,Vandana
International Journal on Computer Science and Engineering , 2010,
Abstract: This work attempts to mathematically formulize the computation of waiting time of any process in a static n-process, CPU-bound round robin scheme. That in effect, can calculate other performance measures also. An improvement in the existing round robin algorithm has also been worked out that provides priority to processes nearing completion. The suggested approach uses two ready queues, wherein a process is returned to the second ready queue after the completion of its penultimate round. This policy reduces the average waiting timeand increases the throughput, in comparison to the conventional round robin scheme, while maintaining the same level of CPU utilization and no substantial increase in the overheads. The mathematical formulation of this policy is transparent enough; it provides, for each process, the actual order of shifting to the second queue and also the order of termination.
Surgical management of recurrent and nonhealing corneal ulcer
Pandey D,Agarwal M
Indian Journal of Ophthalmology , 1983,
Abstract:
Familial incidence of pseudopelade of brocq
Sharma D,Pandey S
Indian Journal of Dermatology, Venereology and Leprology , 1993,
Abstract: Pseudopelade of Brocq is an asymptomatic, beginning insidiously with small, white, depressed, bald spots, devoid of normal hair that mark the borders of some of the earlier lesions with atrophy and minimal perifollicular erythema, if at all. We report here a family of 3 members (2 brothers and 1 sister) with similar findings of cicatricial alopecia for more than 10 years duration but without any cause which may lead to scarring and loss of hair of primary type of pseudopelade. To the best of our knowledge no familial incidence of pseudopelade has been reported any where in the literature so far.
Fuzzy optimization of primal-dual pair using piecewise linear membership functions
Pandey D.,Kumar S.
Yugoslav Journal of Operations Research , 2012, DOI: 10.2298/yjor090519008p
Abstract: Present paper improves the model of Bector and Chandra [Fuzzy Sets and Systems, 125 (2002) 317-325] on duality in fuzzy linear programming by using non-linear membership functions. Numerical problem discussed by these authors has also been worked out through our non-linear model to demonstrate improved optimality of the results.
Single and Competitive Sorption of Heavy Metal Ions (Cd2+ & Cu2+) on a Clayey Soil
Vibhawari,N. D. Pandey
Journal of Chemistry , 2010, DOI: 10.1155/2010/710546
Abstract:
Response of Maize to Cement Dust Pollution
Arti Kumari,D D Pandey
World Journal of Science and Technology , 2011,
Abstract: The study area was confined to the prevailing wind direction of Kalyanpur Cement Limited, Banjari, Rohtas, Bihar (240 57' North latitude and 840 East longitude) about 200 km south from Patna to know the response of maize (Zea mays) to cement dust pollution to growth parameters, chlorophyll, nutrients and characteristics of grains. Growth parameters were found higher on each sampling date of the control maize plant than the polluted one. The chlorophyll of control and polluted maize plant were compared and it was found that a maximum reduction of 14.71 per cent of total chlorophyll was recorded at the age of 60 days. Nitrogen and phosphorus was comparatively higher on control maize than polluted one where potassium was reverse. Characteristics of grain of maize had higher value in control maize than polluted maize grains except carbohydrate and calcium.
Wear Characteristics in Al-SiC Particulate Composites and the  [PDF]
Z. Hasan, R. K. Pandey, D.K. Sehgal
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1014104
Abstract: The Al-Si alloy with near eutectic composition has been conventionally used as a piston material for automobile applications. It is required to possess high abrasive wear resistance for enhanced life of the engine. The alloy is known to have fairly good wear resistance due to increased percentage of silicon present in fine form. In the present investigation, Al-SiC particulate composites have been studied for their wear resistance against emery paper (400 grit SiC particles) counterface and a comparison has been made with existing piston alloy i.e. Al-Si alloy. The Al-SiC composites have been prepared using Liquid Metallurgy technique employing 2124 Al alloy as the base material with 10 and 20 % SiC particulates by weight. The abrasive wear study has been conducted on a Pin on Disc machine. The wear rate in terms of weight loss per unit sliding distance as well as the volumetric wear rate have been obtained for the Al-SiC composites. The characteristics of worn surface were investigated using SEM. The composites are found to possess very high wear resistance as compared to Al-Si piston alloy. The results have been discussed and important conclusions are outlined.
Role of circular cornea incisions in myopia
Pandey D,Singh Y,Agrawal M,Pandey D
Indian Journal of Ophthalmology , 1984,
Abstract:
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