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Search Results: 1 - 10 of 544827 matches for " M. C. Prasad "
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Functionalization of Cobalt Ferrite Nanoparticles with Alginate Coating for Biocompatible Applications  [PDF]
Prasad M. Tamhankar, Aparna M. Kulkarni, Shrikant C. Watawe
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29179
Abstract: The soft magnetic materials have potential applications in the field of bioengineering as carriers for targeted drug delivery. The magnetic properties, particle size after coating, Curie temperature and its biocompatibility are important parameters for the synthesis of materials. In the present communication cobalt ferrite nanoparticles have been synthesized using co-precipitation method and coated with sodium alginate. The X-ray diffraction and infrared spectroscopic measurements have been used to confirm the ferrite structure formation and coating of the samples with alginate. The SEM micrographs have been used to confirm the particle size which is found to be 45 nm before coating and 78 nm after coating. The saturation magnetization obtained using the hysteresis data for the uncoated cobalt ferrite sample is 19.8 emu/gm while for the coated sample it reduces to 10.2 emu/gm. The AC susceptibility measurements indicate SP structure for the uncoated samples with Curie temperature less than 100℃. The thermo gravimetric measurements have been used to estimate the amount of alginate coating on the sample and it has been correlated with retention of magnetic properties after coating. The value of saturation magnetization reduces after coating due to mass reduction of magnetic material in the sample in accordance with the TGA measurements.
Location of approximations of a Markoff theorem
K. C. Prasad,M. Lari,P. Singh
International Journal of Mathematics and Mathematical Sciences , 1990, DOI: 10.1155/s0161171290000308
Abstract: Relative to the first two theorems of the well known Markoff Chain (J.W.S. Cassels, “An introduction to diophantine approximation ” approximations are well located. Literature is silent on the question of location of approximations in reference to the other theorems of the Chain. Here we settle it for the third theorem of the Chain.
Interlaminar Fracture Toughness of Epoxy Glass Fiber Fly Ash Laminate Composite  [PDF]
Ajit Bhandakkar, Niraj Kumar, R. C. Prasad, Shankar M. L. Sastry
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.54028
Abstract:

Epoxy glass fiber laminate composite (PMCs) are finding ever increasing applications in aerospace and automobile industries due to its high strength to weight ratio and resistance to aqueous environment. Additions of particulate reinforcements in the polymer matrix are reported to improve the Interlaminar Shear Strength and Interlaminar Fracture Toughness of the composites. In the present investigation, epoxy glass fiber laminate composites were processed using hand layup and vacuum bagging technique. The particulate reinforcement precipitator fly ash (25 - 45 μm) was added in the epoxy matrix by mechanical mixing up to 10 wt%. The effects of fly ash reinforcement on the mechanical properties and Interlaminar Fracture Toughness were studied before and after exposure to aqueous fog in a salt fog chamber at 45°C. In unexposed condition Mode I interlaminar fracture toughness of epoxy glass fiber laminate composite improved by the addition of fly ash reinforcement 10% (By weight) by 49.43% and when it was subjected to aqueous fog for 10 days the interlaminar fracture toughness improved 58.42%. Exposure to aqueous fog for 10 days causes plasticization of resin matrix and weakening of fiber/matrix interface results in improvement in interlaminar fracture toughness. The fracture surfaces were analyzed using scanning electron microscopy.

Experimental Methods of Determining Fracture Toughness of Fiber Reinforced Polymer Composites under Various Loading Conditions  [PDF]
M.S. Sham Prasad, C.S. Venkatesha, T. Jayaraju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1013099
Abstract: Polymer composites is a typical material consisting of a matrix reinforced with fiber/filler and the general nature of construction of the material itself provides innumerable sites for the initiation of a defect or for the growth of delamination. The life expectancy of composite structure requires a clear understanding of the material’s response to the growth of interlaminar delamination under Mode I, Mode II, Mode III and Mixed Modes. Fracture testing of fiber reinforced polymer-matrix composites is an active area of research. Even though substantial progress in the area of fracture testing has been achieved, there are still several problems awaiting solution. The new aspects in the experimental studies of interlaminar and intralaminar fracture toughness of polymer matrix composites were emphasized in this review paper. The different modes to evaluate the fracture energy were listed and their suitability was mentioned.
ADVECTION-DIFFUSION NUMERICAL MODEL OF AN AIR POLLUTANT EMITTED FROM AN AREA SOURCE OF PRIMARY POLLUTANT WITH WET DEPOSITION
C M SURESHA,LAKSHMINARAYANACHARI K,M SIDDALINGA PRASAD,PANDURANGAPPA C
International Journal of Engineering Science and Technology , 2012,
Abstract: A two dimensional advection-diffusion numerical model of air pollutant emitted from an area source of primary pollutant with wet deposition is presented. We study the effect of removal mechanism i.e. wet deposition on primary pollutant with respect to distance and height for stable and neutral cases. The numerical model has been solved by using Crank-Nicolson implicit finite difference technique. Concentration contours are plotted and results are analysed for primary pollutant in stable and neutral atmospheric situations for various meteorological parameters.
Carbon Dioxide Emissions from the Tropical Dowleiswaram Reservoir on the Godavari River, Southeast of India  [PDF]
M. H. K. Prasad, V. V. S. S. Sarma, V. V. Sarma, M. S. Krishna, N. P. C. Reddy
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.55054
Abstract:

Time-series observations were conducted in the Dowleiswaram dam reservoir that was constructed on the largest monsoonal river in India to understand the source of inorganic carbon, and fluxes to the atmosphere. The reservoir stores water during dry period of six months and water increases during the period when Indian subcontinent receives significant rainfall. Significant modification of organic matter was noticed during storage period indicated by decrease in pH from 7.5 to 6.4 and oxygen saturation from ~95% to 65%. The relationship of dissolved inorganic carbon (DIC) with oxygen saturation, dissolved organic carbon (DOC) and isotopic ratios of DIC suggests that heterotrophic activities are the major source of inorganic carbon to the reservoir. In addition to this, ground water exchange also contributes significantly to the inorganic carbon pool in the reservoir. Nutrients released due to decomposition of organic matter in the reservoir supports both autotrophic and heterotrophic activities. The pCO2 levels in the reservoir varied between 3944 and 16,042 μatm and higher pCO2 levels were noticed during peak discharge period. The annual mean CO2 fluxes from the reservoir amounted to 112 ± 126 mmolC m-2·d-1 and ~6 times higher fluxes were noticed during discharge period compared to dry period and such high fluxes during discharge

Genetics of resistance to Fusarium wilt in castor caused by Fusarium oxysporum f. sp . ricini
C. Lavanya,M.A Raoof,M. Santha Lakshmi Prasad
Indian Phytopathology , 2011,
Abstract: Wilt caused by Fusarium oxysporum f. sp . ricini is a major problem in all castor growing areas of India leading to heavy loss of plant population of susceptible varieties in different stages of the crop. Six generations of three crosses of castor were evaluated in the wilt sick plot to study the genetics of wilt resistance. The disease resistance in F1 of the cross VP-1 x 48- 1 indicated that resistance to Fusarium wilt is recessive while in the other two crosses, DCP 13 / RG 297 and DPC 9 / RG 297 resistance is incompletely dominant. The cross DPC 9 x RG 297 involving both resistant parents gave higher level of resistance compared to the other two crosses involving one resistant parent. The inheritance of resistance to wilt is governed by oligogenes with epistatic interactions. Haymans scaling test indicated that both allelic and nonallelic interactions were significant for inheritance of the trait.
Effect of Oxalate Precursor Formation Temperature on Magnetic Properties of Nicuzn Ferrites  [PDF]
Neelam S. Shinde, Sujata S. Khot, Bhimrao P. Ladgaonkar, Bharat B. Kale, Sanjay Apte, Prasad M. Tamhankar, Shrikant C. Watawe
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.28148
Abstract: Ni-Cu-Zn ferrites with general formula Ni0.5Zn0.5-x/2Cux/2Fe2O4 (with x = 0.3, 0.4, 0.5 and 0.6) have been synthesized using oxalate precursor method with different precursor reaction temperatures in the range 10℃ to 70℃. The Curie temperatures obtained using AC susceptibility measurements are found to be in the range 150℃ to 350℃, the measurements also show single domain structure for all the samples except few compositions obtained at 35℃ precursor reaction temperature, show a multi-domain behaviour. The saturation magnetization is found to be in the range 20 to 51 emu/gm, while the magnetic moment is found to be in the range 0.63 to 1.5 µB. The hysteresis losses were found to be maximum for the samples obtained at precursor reaction temperature of 35℃. The grain size is found to be in the range 0.4 to 2.0 µm.
Automatic Clustering Using Teaching Learning Based Optimization  [PDF]
M. Ramakrishna Murty, Anima Naik, J. V. R. Murthy, P. V. G. D. Prasad Reddy, Suresh C. Satapathy, K. Parvathi
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.58111
Abstract:

Finding the optimal number of clusters has remained to be a challenging problem in data mining research community. Several approaches have been suggested which include evolutionary computation techniques like genetic algorithm, particle swarm optimization, differential evolution etc. for addressing this issue. Many variants of the hybridization of these approaches also have been tried by researchers. However, the number of optimal clusters and the computational efficiency has still remained open for further research. In this paper, a new optimization technique known as “Teaching-Learning-Based Optimization” (TLBO) is implemented for automatic clustering of large unlabeled data sets. In contrast to most of the existing clustering techniques, the proposed algorithm requires no prior knowledge of the data to be classified rather it determines the optimal number of partitions of the data “on the run”. The new AUTO-TLBO algorithms are evaluated on benchmark datasets (collected from UCI machine repository) and performance comparisons are made with some well-known clustering algorithms. Results show that AUTO-TLBO clustering techniques have much potential in terms of comparative results and time of computations.

Systematic Review of Complete Denture Impression Techniques
Rajendra Prasad Bitragunta,Sashi purna C R,Mallikarjun M
Indian Journal of Dental Advancements , 2011, DOI: 10.5866/3.4.673
Abstract: Much has been spoken about complete denture impression procedures. It is evident from the voluminous literature available on the subject that there has been a persistent disagreement among various authors ever since 1850 regarding the various concepts. The importance of an in-depth review of impression making for complete dentures lies in the assessment of the historical value of all the factors related to physical, biologic and behavioral areas and the time in which they were discussed and taught as well.
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