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Search Results: 1 - 10 of 151967 matches for " H. Prakash "
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Teleportation of Superposition of Coherent States Using 4-Partite States and Effect of Decoherence on Fidelity  [PDF]
H. Prakash, N. Chandra, Shivani A. Kumar, Ranjana Prakash
Journal of Quantum Information Science (JQIS) , 2012, DOI: 10.4236/jqis.2012.24019

A scheme of teleporting a superposition of coherent states |α> and |-α> using a 4-partite state, a beam splitter and two phase shifters was proposed by N. Ba An (Phys. Rev. A, 68, 022321, 2003). The author concluded that the probability for successful teleportation is only 1/4 in the limit |α| and 1/2 in the limit |α|. In this paper it is shown that the author’s scheme can be altered slightly so as to obtain an almost perfect teleportation for an appreciable value of |α|2. We find the minimum assured fidelity i.e., the minimum fidelity for an arbitrarily chosen information state, which we write MAF in this paper, for different cases. We also discuss the effect of decoherence on teleportation fidelity. We find that if no photons are counted in both final outputs, MAF, is still nonzero except when there is no decoherence and the initial state (the state to be teleported) is even coherent state. For non-zero photon counts, MAF decreases with increase in |α|2 for low noise. For high noise, however, it increases, attains a maximum value and then decreases with |α|2. The average fidelity depends appreciably on the initial state for low values of |α|2 only.

ICF in Physical Medicine and Rehabilitation
Prakash H,Anand V
Indian Journal of Physical Medicine and Rehabilitation , 2010,
Abstract: The International Statistical Classification of Disease(ICD 10) and related health problems focuses ondiagnosis, disorders, morbidity and mortality. TheInternational Classification of Functioning, Disability andHealth by World Health Assembly (ICF) augments andenriches the ICD 10 in a way of a multipurposeclassification for description and measurement of aperson's functional status and associated health condition.Together the ICF and ICD 10 form the WHO Family ofInternational Classifications and provide a meaningfulpicture of health. In May 2001, the world health assemblyratified and approved the ICF for implementation in variousfields.
The role of nonlinear Landau damping and the bounced motion of protons in the formation of dissipative structures in the solar wind plasma
M. Prakash,P. H. Diamond
Nonlinear Processes in Geophysics (NPG) , 1999,
Abstract: The present work examines the effects arising from the nonlinear Landau damping and the bounced motion of protons (trapped in the mirror geometry of the geomagnetic field) in the formation of nonlinear Alfvénic structures. These structures are observed at distances 1-5AU in the solar wind plasma (with ~ 1). The dynamics of formation of these structures can be understood using kinetic nonlinear Schrodinger (KNLS) model. The structures emerge due to balance of nonlinear steepening (of large amplitude Alfvén waves) by the linear Landau damping of ion-acoustic modes in a finite solar wind plasma. The ion-acoustic mode is driven nonlinearly by the large amplitude Alfvén waves. At the large amplitudes of Alfvén wave, the effects due to nonlinear Landau damping become important. These nonlinear effects are incorporated into the KNLS model by modifying the heat flux dissipation coefficient parallel to the ambient magnetic field. The effects arising from the bounced motion (of mirroring protons) are studied using a one-dimensional Vlasov equation. The bounced motion of the protons can lead to growth of the ion-acoustic mode, propagating in the mirror geometry of the geomagnetic field. The significance of these studies in the formation of dissipative quasistationary structures observed in solar wind plasma is discussed.
Anterior Crossbite Correction in Early Mixed Dentition Period Using Catlan's Appliance: A Case Report
Prashanth Prakash,B. H. Durgesh
ISRN Dentistry , 2011, DOI: 10.5402/2011/298931
Aroylketene dithioacetal chemistry: facile synthesis of 4-aroyl-3-methylsulfanyl-2-tosylpyrroles from aroylketene dithioacetals and TosMIC
Prakash Rao H Surya,Sivakumar S
Beilstein Journal of Organic Chemistry , 2007, DOI: 10.1186/1860-5397-3-31
Abstract: The cycloaddition of the von Leusen's reagent (p-tolylsulfonyl)methyl isocyanide (TosMIC) to α-aroylketene dithioacetals (AKDTAs) in the presence of sodium hydride in THF at rt resulted in a facile synthesis of the 4-aroyl-3-methylsulfanyl-2-tosylpyrroles 3 in good yield along with a minor amount of 4-[(4-methylphenyl)sulfonyl]-1-[(methylsulfanyl)methyl]-1H-imidazole 4. This study lead to the synthesis of 2,3,4-trisubstiuted pyrroles having 1-naphthoyl/2-naphthoyl/ferrocenoyl/pyrenoyl scaffolds on C-4 of the pyrrole ring. In this transformation, the AKDTAs behave as a 3-(methylsulfanyl)-1-aryl-2-propyn-1-one (ArCOC≡CSMe) equivalent. Competition experiments clearly showed that the cycloaddition of TosMIC to "push-pull" alkenes like AKDTAs is slower compared to general α,β-unsaturated carbonyl compounds.
Effect of Single Event Multilevel Soft Tissue Surgery on Gait Parameters in Spastic Diplegia
Prakash H,Ganesh T,Bhattacharji S
Indian Journal of Physical Medicine and Rehabilitation , 2007,
Abstract: Locomotion in subjects with Cerebral Palsy is complicated by a variety of deformities and their respective compensatory mechanisms. Children presenting with cerebral diplegia have reduced range of motion in their joints, short stride length, and increase in the energy requirement during standing and walking. In this study instrumented gait analysis data of 14 subjects with cerebral diplegia, prior to intervention was compared with data from similar analysis after multilevel soft tissue surgery and rehabilitation. Following intervention there was an increase in the range of motion in the hip and knee joints; stride length, single limb support and reduction in the energy cost of ambulation. Statistically significant differences were notedonly for the stride length data (p=0.004). Overall the gait was improved by multilevel soft tissue surgery, as there was an increase in the degrees of freedom of movement in the kinetic chain.
Elliptical Iris Detection using Morphological Operations
Prakash J. Kulkarni,Vidya H. Kopanar
International Journal of Computer Science and Mobile Computing , 2013,
Abstract: This paper presents a method to detect an iris to operate in 3D coordinate system. As perprojective geometry, circle in 3D is projected as an ellipse in 2D. Hence, iris is detected as an ellipse insteadof a circle. Morphological operations of light computations are used to detect an iris, which reduces time todetect an iris. Eye images with high resolution provide more number of pixels giving accuracy. Such detectedellipse can be further used to map to a circle in 3D using calibrated camera.
1-D Paracrystalline Model to Simulate a Bragg Reflection: Computation of Crystallite Size and Lattice Strain  [PDF]
M. B. Nanda Prakash, G. Thejas Urs, H. T. Ananda, R. Somashekar
Crystal Structure Theory and Applications (CSTA) , 2014, DOI: 10.4236/csta.2014.32006

A simple and elegant method to simulate single order reflection profile based on 1-D paracrystalline model has been proposed here. For variety of polymer films this approach has been applied to compute microcrystalline parameters like crystallite size and lattice strain. Other metallic oxide compounds are also analysed using this approach. Employing this model, X-ray diffraction patterns from various polymer samples have been analysed and corresponding microstructure parameters have been reported in this article.

Viscometric Functions for a Dilute Solution of Polymers in a Good Solvent
J. Ravi Prakash,H. C. Oettinger
Physics , 1998, DOI: 10.1021/ma981534b
Abstract: A dilute polymer solution is modeled as a suspension of non-interacting Hookean dumbbells and the effect of excluded volume is taken into account by incorporating a narrow Gaussian repulsive potential between the beads of each dumbbell. The narrow Gaussian potential is a means of regularising a delta-function potential---it tends to the delta-function potential in the limit of the width parameter going to zero. Exact predictions of viscometric functions in simple shear flow are obtained with the help of a retarded motion expansion and by Brownian dynamics simulations. It is shown that for relatively small non-zero values of the width parameter, the presence of excluded volume causes a swelling of the dumbbell at equilibrium, and shear thinning in simple shear flow. On the other hand, a delta function excluded volume potential does not lead to either swelling or to shear thinning. Approximate viscometric functions, obtained by assuming that the bead-connector vector is described by a Gaussian non-equilibrium distribution function, are found to be accurate above a threshold value of the width parameter, for a given value of the strength of excluded volume interaction. A first order perturbation expansion reveals that the Gaussian approximation is exact to first order in the strength of excluded volume interaction. The predictions of an alternative quadratic excluded volume potential suggested earlier by Fixman (J. Chem. Phys., 1966, 45, 785; 793) are also compared with those of the narrow Gaussian potential.
A Calculus for $SU(3)$ Leading to an Algebraic Formula for Clebsch-Gordan Coefficients
J. S. Prakash,H. S. Sharatchandra
Mathematics , 1996, DOI: 10.1063/1.531750
Abstract: We develop a simple computational tool for $SU(3)$ analogous to Bargmann's calculus for $SU(2)$. Crucial new inputs are, (i) explicit representation of the Gelfand-Zetlin basis in terms of polynomials in four variables and positive or negative integral powers of a fifth variable (ii) an auxiliary Gaussian measure with respect to which the Gelfand-Zetlin states are orthogonal but not normalized (iii) simple generating functions for generating all basis states and also all invariants. As an illustration of our techniques, an algebraic formula for the Clebsch-Gordan coefficients is obtained for the first time. This involves only Gaussian integrations. Thus $SU(3)$ is made as accessible for computations as $SU(2)$ is.
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