IOSR-JAP   Volume-8 ~ Issue-1 ~ Jan-Feb 2016

ABSTRACT: The first order chemical reaction effects on transient free convective flow of a viscous incompressible flow past a vertical plate with mass transfer in the presence of magnetic field is considered. Solutions of the governing equations are obtained by the Laplace transform method and are presented graphically for the different values of physical parameters. It is observed that magnetic field parameter and chemical reaction parameter influence the velocity and concentration profiles significantly. Key words: Chemical Reaction, Free Convection, MHD, Variable Temperature

[1] Abramowitz B. M. and Stegum I. A.(1965) : Handbook of Mathematical Functional function, Dover Publications, NewYork.
[2] Chaudhary R. C. and Jain A. (2009): MHD heat and mass diffusion flow by natural convection past a surface embedded in a porous medium, Theoret. Appl. Mech., 36(1),1-27
[3] Das U. N., Deka R. K. and Soundalgekar V. M. (1994): Effects of mass transfer on flow past an impulsively started vertical infinite plate with constant heat flux and chemical reaction, Forschung in Ingenieurwesen, 60, 284-287.
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ABSTRACT: In recent years physics education research (PER) has gained lot of prominence in effective delivery and understanding of physics learning. Understanding students' prior belief in nuclear physics is a first step towards improving nuclear physics instructions. Hence development of research-based multiple-choice questions tests about Nuclear Physics is important for assessing student's difficulties and for evaluating curriculum and pedagogies to reduce the difficulties. Nuclear Physics is taught at the bachelor degree B.Sc.
programme and master degree M.Sc. level in all the colleges and universities of Himachal Pradesh. We explore the difficulties that the undergraduate B.Sc. and postgraduate M.Sc. students have with nuclear physics.

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ABSTRACT: Studies have shown that most planetary bodies, the sun and earth inclusive, are better described as oblate spheroids rather than spherical. In this paper, using the Golden Metric tensor, we derive the expression for the Riemannian Laplacian in Oblate Spheroidal coordinate systems by the method of tensor analysis. The derived expression for the Riemannian Laplacian in Oblate Spheroidal coordinate systems reduce to pure Newtonian Laplacian in the limit c0 and contains post-Newtonian correction terms of all orders c-2. The result obtained here opens the way for applications of the Riemannian Laplacian to all bodies in the Spheroidal coordinate system.
Keywords: Golden metric tensor, Riemannian Laplacian, Oblate Spheroidal coordinates Post-Newtonian correction

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ABSTRACT: This study introduces an MBL (Microcomputer based laboratory) experiment which can be used to study motion along a trajectory. IR Sensors placed in the path of motion collect experimental data which is used in a software program to calculate accurately the displacement, velocity and acceleration as a function of time. There is a real time graphical representation of motion parameters like displacement, velocity and acceleration as a function of time. This was used to explain motion qualitatively as well as quantitatively to the students. The accuracy of the method was established through its ability to correctly measure the values of the acceleration due to gravity 'g'.

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[5] Brasell, H. (1987). The effect of real-time laboratory graphing on learning graphic representation of distance and velocity. Journal of Research in Science Teaching, 24(2), 385-395. [6] Kurt Wick and Keith Ruddick, (1999) "An accurate measurement of g using falling balls," Am. J. Phys. AJPIAS0002-9505 67, 962–965.

ABSTRACT: The effects of ion bombardment on sputtering behaviour of Cu, Ni and Cu-Ni targets in inert and active gas atmospheres were investigated separately using a dc planar magnetron sputtering system. It was found that the hysteresis loops (current-voltage characteristics) obtained for the different sputtered targets were greatly affected by target material, gas type and gas pressure. The occurance of these loops were due to: (1) residual ionization in case of using dry argon atmosphere; (2) formation of copper oxide and/or nickel oxide on the target surface when using oxygen in the glow discharge. The results also showed the formation of rough deposit circles on the outer face of each sputtered target and their diameters were depending on the above mentioned parameters. Scanning electron microscopy was also used to examine different morphological features formed on the sputtered targets in different plasma atmospheres.

Keywords: Cu; Ni; Cu-Ni; Magnetron Sputtering; Hysteresis Behaviour.

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ABSTRACT: Preferable estimate to the amount of agricultural yield is performed by using high-resolution satellite images. Unfortunately free available satellite images provide by the Earth Resources and Science Center (EROS) are either of low or moderate resolutions. For example the available Landsat satellite images are of 30meter/pixel resolution. Accordingly, analysis capability of such images may not be accurate because of the overlapping between the specifications of land cover components. This paper presents a method to estimate the areas of crop of rice by using Landsat images based on normalized difference vegetation Index (NDVI) and scatterplot classification methods (SCP). The crop of rice estimation is implemented on Landsat-8 (Operational Land Imager OLI) images.

[1] S.M. Ali, and S.S. Salman, "Estimating the Yield of Rice Farms in Southern Iraq using Landsat images," International Journal of Scientific & Engineering Research, Volume 6, Issue 8, pp. 1607-1614, August-2015
[2] S.M. Ali, and S.S. Salman, "Chronological Calibration Methods for Landsat Satellite Images," IOSR Journal of Applied Physics, Volume 7, Issue 6,PP 107-115, Nov. - Dec. 2015.
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ABSTRACT: The microstructure, the wear and corrosion behavior of WC-CoCr coatings, deposited on mild steel substrate by High Velocity Oxygen-Fuel (HVOF) flame-spraying, were examined as a function of oxygen flow ratio, standoff distance and powder feed rate during the deposition process. It is observed that the surface roughness, micro hardness and fretting wear of the coated film depends on the stand off distance at a constant power feed rate. At elevated stand off distance the surface roughness increases while the micro-hardness decreases. Fretting wear study shows the applicability of the coating whereas potentio-dynamics scanning reveals the corrosion property as well as the possible galvanic coupling effects between the substrate and the coating.

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ABSTRACT: Vibrational behaviour of vacancy in bcc transition metal Ta is discussed using the modified embedded atom method (MEAM) potential. A second neighbours MEAM model is considered to obtain the force-constants of pure Ta and first and second neighbour atoms of vacancy. With the application of MEAM potential, the obtained force-constants are used to calculate the local vibrational density of states and mean square thermal displacements of first and second neighbours of vacancy using Green's function method and compared with that of the atoms in pure lattice. The value of vacancy formation entropy is also calculated and found to be in agreement with other available results.

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ABSTRACT: Single crystals of semiorganic material BIS L-alanine Strontium Nitrate (BLASN) of size 17 x 10 x 3 mm3 have been grown by the slow evaporation of an aqueous solution of deionized water. The crystal belongs to orthorhombic system with the space group P222. The lattice parameter values of BLASN crystal are identified using single crystal XRD studies. The crystalline perfection of the crystal have been studied by powder XRD analysis. The presence of functional groups and the protonation of ions were confirmed by Fourier transform infrared transmission (FTIR). Optical transmittance of the grown crystals have been studied by UV-vis NIR spectrum. The optical band gap of the grown crystal is 5.511 eV. Thermal stability of the crystal was investigated using thermogravimetric and differential thermal analysis. The mechanical behavior has been analyzed by Vickers microhardness test. The second harmonic generation efficiency has been studied using Kurtz powder technique.

Keywords: Crystal growth; solubility; single crystal XRD; Powder XRD; FTIR; UV-Vis- NIR; TG/DTA; Microhardness; SHG

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ABSTRACT: Generalized special relativity is one of the most promising models that is found to cure many defects of special relativity. These defects include un capability of explaining gravitational red shift and satisfaction of the Newtonian limit. Despite these successes generalized special relativity suffers from noticeable setbacks. First of all its way of derivation make it restricted to weak fields only. Although recent derivation make it applicable to fields other than the weak and gravitational field, but this derivation needs to be strengthen.

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ABSTRACT: For describing the dynamics of blood flow, the viscoelastic parameters such as viscosity and elasticity, should be obtained from the measurements under oscillatory shear flow.Viscoelastic materials have interesting properties. They exhibit both viscous behaviour as well as elasticity. When a constant displacement is applied, the stresses of a viscoelastic material gradually relax over time because of these properties. Conversely, under a constant applied force, elastic strains continue to accumulate, deforming further more. Because of this complex behaviour, the use of linear material properties is generally inadequate in accurately determining the final shape of viscoelastic material, the time taken to arrive at that geometry, and the stresses on the part. In these cases, the material's viscoelasticity must be taken into account in the simulation.......

Key Words : Elastic Constant, coefficient of absorption, modulus of elasticity and loss modulus

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