IOSR-JAP   Volume-1 ~ Issue-2 ~ July–August 2012

Abstract: Flow of water at its maximum density past a vertical plate is considered. Effects of a transversely applied magnetic field, variation of the plate temperature and a first order chemical reaction on the flow field are studied by a similarity transformation of the governing equations. For various values of the magnetic, plate temperature exponent and chemical reaction parameter, numerical values proportionate to Skin friction, Nusselt number and Sherwood number are tabulated and graphical results for the velocity, temperature and concentration profiles are presented. Computed values and graphical results for flow of water at a normal temperature are compared with that of flow at 4⁰C.
Key words: Chemical reaction, density of water, plate temperature, Prandtl number , Schmidt number.

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Abstract : Single charge transfer cross-section in H⁺-Li (2s) collisions has been studied in the frame work of the Coulomb-Born Distorted Wave approximation (CBDWA). The differential as well as total cross-sections have been calculated in the energy range from 10keV to 1MeV.The results so obtained have been compared with other's available results.
Key words: Coulomb-Born distorted wave approximation. Differential cross-sections, Electron captureTotal cross-sections

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Abstract: Pure and Doped L- Arginine Maleate (LArM) a nonlinear optical material has been successfully
grown from slow evaporation method. FTIR analysis was used to confirm the presence of various functional
groups in the grown crystals. Kurtz powder SHG measurements confirm the NLO property of the grown crystal.
X- Ray powder diffraction studies have been carried out in order to calculate the lattice parameter values.

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Abstract: Good optical quality single crystals of pure and doped L-Alaninium Maleate (LAM) crystals have been grown. The crystals have been grown by slow evaporation method at a constant temperature of 35˚C from its aqueous solution. The grown single crystals of pure and doped LAM were characterized by employing FTIR, SHG, ICP, Dielectric study and X- ray diffraction methods.
Keywords: Dielectric, Ftir, Icp, Shg, X-Ray Diffraction

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ABSTRACT : A new model of lattice dynamics has been developed by incorporating the effect of van der Waals interactions and three-body interactions in the frame work of rigid shell model where short range interactions are effective upto the second neighbour. This model has been applied to study the complete lattice dynamics of strontium oxide (SrO). A good agreement has been obtained between theory and experiment.
Keywords: Lattice dynamics, Phonon dispersion curves, Debye temperature, two phonon IR and Raman Spectra, An harmonic elastic constants, combined density of states, strontium oxide.

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Abstract : A liquid crystal nanocomposite, comprised of 5wt% ferroelectric type BaTiO3 nanoparticles in antiferroelectric phase liquid crystal host MHPOBC, has been prepared to study the effect of nanodope. Experimentally, it has been observed that the spontaneous polarization (Ps) has been reduced and SmC*-SmA* transition temperature (T*) has been shifted towards the lower temperature side in case of BaTiO3 doped MHPOBC. In order to explain the above facts a new phenomenological model has been developed and formulated. Further studies on dielectric measurement and effect of higher doping concentration have satisfied the outcome of the model.
Keywords– barium titanate nanoparticles; nanowall; domain formation; Goldstone mode; system entropy

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Abstract: Electron capture differential and integral cross-sections for collisions of deuterons with hydrogen atom in the ground state have been calculated in the high energy range from 20keV to 40MeV using the Coulomb-Born approximation. The differential cross-sections have been calculated in the energy range from 0-4mrad.The isotopic effect of mass on the integral cross-sections have been compared with that of protonhydrogen collisions.
Key Words: Differential cross sections, deuterons, Coulomb Born approximation, Isotopic effect

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Abstract: Sum and difference squeezing was defined by Hillery who showed that these turn into normal squeezing in sum and difference frequency generation. We re-examine this using an intense coherent pump mode and with a much better approximation. Our results are valid for much larger interaction times and therefore enable detection of smaller sum and difference squeezings, in principle., Moreover, if both, our and Hillary's results are regarded holding, our results lead to more squeezing.
Keywords: Coherent state; squeezing; sum a

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