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Bhīmavaram, India

Radhika T.S.L.,Vishnu Institute of Technology | Iyengar T.K.V.,National Institute of Technology Warangal
Proceedings of the International MultiConference of Engineers and Computer Scientists 2010, IMECS 2010 | Year: 2010

The present paper deals with the problem of the Stokes flow of a couple stress fluid past a porous spheroidal shell consisting of a pair of con focal spheroids S0 and S1 where S0 is within S 1. The region within S0 is filled with couple stress fluid, the annular region between S0 and S1 is assumed to be porous and the same couple stress fluid as that within S0 flows with a uniform velocity in the free region (i.e) outside S1. The problem is formulated using the V.K. Stokes' equation describing the flow outside the shell as well as the flow inside the shell while an analogue of the classical Darcy law in the theory of porous media is used within the shell region. Under Stokesian approximation, the solution is then, sought analytically and the expressions for the flow field variables are obtained in terms of Legendre functions, associated Legendre functions, radial prolate spheroidal wave functions and angular prolate spheroidal wave functions. The stresses acting on the shell are estimated and the drag experienced by the body is obtained. Numerical study is undertaken to study the effect of the permeability of the medium, couple stress parameter and the geometric parameter on the drag and the results are presented using graphs. It is found that, for a fixed S 0 as the eccentricity of the outer spheroid increases, the drag decreases. Source

Sablok G.,Research and Innovation Center | Mudunuri S.B.,Vishnu Institute of Technology | Patnana S.,International Institute of Information Technology, Hyderabad | Popova M.,Plovdiv University | And 3 more authors.
DNA Research | Year: 2013

Microsatellites or simple sequence repeats (SSRs) are repetitive stretches of nucleotides (A, T, G, C) that are distributed either as single base pair stretches or as a combination of two- to six-nucleotides units that are non-randomly distributed within coding and in non-coding regions of the genome. ChloroMitoSSRDB is a complete curated web-oriented relational database of perfect and imperfect repeats in organelle genomes. The present version of the database contains perfect and imperfect SSRs of 2161 organelle genomes (1982 mitochondrial and 179 chloroplast genomes). We detected a total of 5838 chloroplast perfect SSRs, 37 297 chloroplast imperfect SSRs, 5898 mitochondrial perfect SSRs and 50 355 mitochondrial imperfect SSRs across these genomes. The repeats have been further hyperlinked to the annotated gene regions (coding or non-coding) and a link to the corresponding gene record in National Center for Biotechnology Information(www.ncbi.nlm.nih.gov/) to identify and understand the positional relationship of the repetitive tracts. ChloroMitoSSRDB is connected to a user-friendly web interface that provides useful information associated with the location of the repeats (coding and non-coding), size of repeat, motif and length polymorphism, etc. ChloroMitoSSRDB will serve as a repository for developing functional markers for molecular phylogenetics, estimating molecular variation across species. Database URL: ChloroMitoSSRDB can be accessed as an open source repository at www.mcr.org.in/chloromitossrdb. © The Author 2012. Source

Hima Bindu K.,Vishnu Institute of Technology | Raghavendra Rao C.,Telangana University
Advances in Intelligent Systems and Computing | Year: 2015

This paper considers a decision system with a fuzzy decision attribute (with finite set of values) to account for uncertainty. A novel fuzzy classification approach using a class of decision trees is developed. A decision tree is constructed for each decision category using Coefficient of Variation Gain as the attribute selection measure. A metric based on Residual Sum of Squares (RSS) to compare the fuzzy classifier is presented. The methodology of constructing the classifier and its performance aspects are presented. © Springer International Publishing Switzerland 2015. Source

Rajyalakshmi C.,Vishnu Institute of Technology | Benjamin T.,P.A. College | Rambabu C.,Acharya Nagarjuna University
Der Pharma Chemica | Year: 2013

A stability indicating reverse phase high performance liquid chromatography method has been developed for the estimation of Dronedarone in tablet dosage form. A symmetry C18 column having dimensions of 150×4.6mm and 3μm particle size, with mobile phase containing a mixture of acetonitrile and phosphate buffer in the ratio of 60:40 v/v was used. PH of mobile phase was adjusted to 6.8 with sodium hydroxide. The flow rate was 1ml/min and the column effluents were monitored at 290 nm. The retention time for Dronedarone was found to be 2.65min. The proposed method was validated in terms of linearity, accuracy, precision, LOD, LOQ and robustness. The LOD and LOQ were found to be 0.018μg/ml and 0.06μg/ml respectively. The method was found to be linear in the range of 10-50 μg/ml with regression coefficient (r = 0.9996). The % recovery for the Dronedarone was found to be 99.6 and the forced degradation studies were also carried out as per ICH guidelines. There was complete separation of degradation peak and Dronedarone peak, which demonstrate the specificity of assay method for estimation of Dronedarone in the presence of its degradation products; it can be employed as a stability indicating one. Due to simplicity, rapidity and accuracy of the proposed stability indicating HPLC method is useful for quality control analysis. Source

Yasmeena,Vishnu Institute of Technology | Das G.T.R.,Jawaharlal Nehru Technological University
IEEE International Conference on Circuit, Power and Computing Technologies, ICCPCT 2015 | Year: 2015

This paper presents the structural and operational comparison of line commutated converter (LCC), voltage source converter (VSC) and Modular Multi level converter(MMC) for High voltage applications and also presents the simulation model of modular multilevel converter (MMC) which is one of the most promising converter topologies for highvoltage applications, especially for high-voltage direct-current (HVDC) transmission systems. The converter is characterized by a modular arm structure, formed by a cascaded connection of a large number of simple chopper cells with floating DC capacitors. These cells are called Sub-Modules (SM) and can be easily assembled into a converter for high-voltage or mediumvoltage power conversion systems. A control scheme also presented for voltage balancing control and a leg total voltage control in order to achieve a stable behavior in all operating conditions. The validity and the effectiveness of the voltage control strategy are confirmed by numerical simulations. Simulations are done by using MATLAB/Simulink software. © 2015 IEEE. Source

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