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

ABSTRACT: Zinc Oxide (ZnO) thin films of 150 nm thickness were prepared by electrostatic spray pyrolysis and subjected to gamma irradiation of 5 Gy, 10 Gy and 15 Gy dose. The as-deposited and irradiated films were subjected to XRD, SEM and UV-VIS spectrophotometer characterizations. XRD pattern of as-deposited and irradiated ZnO thin films were amorphous hexagonal wurtzite structure with preferred orientation along (100) plane. The SEM images exhibited aggregated nanosized particles with visible voids and the exposed ZnO thin films become more and more uniform with fewer voids. The optical band gap and energies band tail of localised states of ZnO thin films decreases with increase in gamma irradiation dose.

Keywords: Thin films, Zinc Oxide, Gamma Irradiation, Dosimetry, Optical Band Gap

[1]. T. K. Maity, & S. L. Sharma, Effect of gamma radiation on electrical, optical and structural properties of tellurium dioxide thin films, Indian Journal of Pure & Applied Physics, 49, 2011, 606-612.
[2]. A. Khalil, & K. Olga, Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures. Sensors, 2, 2002, 347-355.
[3]. V. S. Senthil Srinivasan, M. K. Patra, V. S. Choudhary, & A. Pandya, Gamma irradiation study of tin oxide thin films for dosimetric applications. Journal of optoelectronics and Advanced Materials, 9(12), 2007, 3725-3728.
[4]. T. K. Maity, & S. L. Sharma, Effect of gamma radiation on optical and electrical properties of tellurium dioxide thin films. Bulletin of Materials Sciince, 31(6), 2008, 841-846.
[5]. S. L. Sharma & T. K. Maity, Effect of gamma radiation on electrical and optical properties of (TeO2)0.9(In2O3)0.1 thin films. Bulletin of Materials Sciince, 34(1), 2011, 61-69.
[6]. M. Mohil, & G. A. Kumar, Gamma radiation induced effects in TeO2 thin films. Journal of Nano and Electronic Physiscs, 5 (2), 2013, 1-3.
[7]. N. Shakti & P. S. Gupta, Structural and Optical Properties of Sol-gel Prepared ZnO Thin Film. Applied Physics Research, 2(1), 2010, 19-28.

ABSTRACT: It is known that aluminium and its alloys are of low modulus and medium strength. In order to improve the modulus and strength the composites are made by adding reinforcement in the aluminium and its alloys. Reinforcement can be in fibre form as well as in particulate form. Both have their own advantages. Fibers provide greater strength than particulate while particulate provide isotropic properties. In the present work. MMC has been prepared by reinforcing graphite particles of 50-350 ASTM size range into the base matrix alloy.

Keywords: Reinforcement, MMC,X-Ray Analysis, Tensile test, Deep drawing test, drawability.

[1] Huda M.D., Haskmi M.S.J. , E.I. Baradie (M.A., "Metal matrix composite part 1 : Apple & processing", edited by Newaz G.M., Wahlbier F.H. & Neber-Aeschbacher H, Trans Tech. Publication, Switzerland-Germany-U.K. U.S.A., 1985, PP 37-64.
[2] A.M. Patton, J. Inst Metals, 100 (1972), 197.
[3] F.A. Badia and P.K. Rohatgi, AFS Trans 79 (1969), 402.
[4] Vikash Narian M.E. Thesis University of Roorkee, Roorkee.
[5] D.N. Willaims, J.H. Roberts & R.I. Jaffee, Met. Trans, A.I.M.E., 218 (1960), 574.

ABSTRACT: In this work , we study the transport properties for a quantum dot under magnetic field, embedded between two normal leads in the presence of spin and charge bias .We use the theory of Keldysh non-equilibrium Green's functions technique when the correlation energy on the quantum dot is in the strong interaction limit. We derive model calculation to calculate the occupation numbers on the quantum dot , the spin and charge currents following through it and the differential charge and spin conductance as a function of spin bias. All the spin transport properties are discussed as a function of spin bias. We conclude that the spin transport properties of the device considered in our work are determined by the magnetic field and the spinbias.

Keywords: Spin transport; Quantum Dot; Correlation interaction; magnetic field.

[1] I. Z. J. Fabian, and S. D. Sarma, Rev. Mod. Phys., 76( 323), 2004.
[2] W. T. Ning, C. J. Chen, Q. Chen, et al. "Physica C", Vol. 487, 42-46 , 2013.
[3] M. Johnson, and R. H. Silsbee; "Phys Rev Lett" ,Vol. 55, No. (17), 1985.
[4] M. N. Baibich, J. M. Broto, A. Fert, N. V. Dau, F. N, F. Petroff, P . Etienne, G. Creuzet, A. Friederich, and J. Chazelas; " Phys Rev Lett",Vol. 61,No. (21), 1988.
[5] G . Binasch, P. Grünberg, F. Saurenbach, and W. Zinn; " Physical Review ", Vol. 39, No. (7) ,1989.

ABSTRACT: A new theory has been developed for the nature and properties of radiation which is the modified corpuscular theory and named as corpuscular sphere theory of light and radiation. All the properties of light and radiation like the phenomenon of diffraction and interference inverse square law, photoelectric effect and relativistic mass are clearly explained by the present theory with number of new deductions.

[1]. The theory of heat radiation. Max Planck Dover publication.Inc. Newyork 1959.
[2]. A. Einstein. Ann.d.Physik 17,145,1905.
[3]. W.Dvane; F.L.Hunt. Phys.Rev 6, 166,1915.
[4]. E.G.Dvane, Palmer,Chi-sun-yeh. J.Opt.soc.Am. 5,376,1921.
[5]. N. Bohr. Phil, Mag 26,1,476 and 857,1913.
[6]. C.T.R.Wilson. Proc.Roy.Soc A104,1,1923.
[7]. F.W.Bubb. Phy.Rev.23,137,1924.

ABSTRACT:We studied squeezing in the sum and difference of the field amplitude in parametric down conversion process under the short-time approximation based on a fully quantum mechanical approach. It is shown that for uncorrelated modes the normal squeezing in the sum and difference-frequency field depends on the sum and difference squeezing of input field modes respectively, which can generate normal squeezing in the sum and difference-frequency field mode. We shown that if the high-frequency mode is in a coherent state and the low-frequency mode is squeezed...........

Keywords: Sum and difference squeezing; Higher-order squeezing; Parametric down conversion process; Optical parametric oscillator; Photon number operator.

[1]. D. F. Walls, "Squeezed states of light" Nature 306 141-146 (1983).
[2]. R. Loudon and P. L. Knight, "Squeezed light" J. Mod. Opt. 34 709-759 (1987).
[3]. M. C. Teich and B. E. A. Saleh, "Squeezed states of light" Quant. Opt. 1 153-191 (1989).
[4]. J. Perina, "Quantum Statistics of Linear and Nonlinear Optical Phenomena‖ Kluwer, Dordrecht, Chapters 9 and 10 (1991).
[5]. L. Mandel, ―Nonclassical states of the electromagnetic field‖ Phys. Scr. T 12 34-42 (1986).

ABSTRACT: We have investigated Bianchi type VI0 cosmological model with the matter bulk viscous fluid coupled with electromagnetic field in general theory of relativity. To obtain the deterministic solution of Einstein's field equation, by assuming a relation between metric potential n A C further some physical and geometrical properties of the model are also discussed.

Keywords: Bianchi type VI0, Bulk viscous fluid, electromagnetic field, general theory of relativity.

[1] J. D. Barrow, "Heliam Formation in cosmologies with anisotropic curvature", royal Astronomical society, vol. 211, No.1, 1984,
pp.221-227.
[2] Dunn and Tupper, "A class of Bianchi type VI0 perfect fluid cosmological model with electromagnetic field", the astrophysical
journal, vol. 204,No. 1, 1976, pp. 322-329.
[3] R. Bali, A. Pradhan and A. Hassan, "Bianchi type VI0 magnetized barotropic bulk viscous fluid massive string universe in general
relativity", IJTP, vol.47, No. 10, 2008,pp. 2594-2604.
[4] R. Bali, R. Banerjee and S. K. Banerjee , "Bianchi type VI0 Bulk viscous massive string cosmological models in general theory of
relativity" Astrophysics and Space Science, vol.317, No. 1-2, 2008,pp.21-26.

ABSTRACT: In the present study we report the synthesis of mix Zinc oxide and Cadmium sulphide nanoparticles by a chemical route. The obtained nanoparticles were characterized by X-ray diffraction (XRD) and UV–VIS absorption. The studies confirmed the nanometer size particles formation within the polymer matrix. A UV-VIS optical spectroscopy study was carried out to determine the band gap of the nanocrystalline mix Zinc oxide and Cadmium sulphide thin film and it showed a blue shift with respect to the bulk value. The synthesized nanoparticles showed interesting optoelectronic properties and tremendous antibacterial activity and can be used for water purification.

Keywords: Nanoparticle, XRD, UV–VIS absorption, antibacterial

[1]. R.K. Visaria, R.J. Griffin, B.W. Williams, E.S. Ebbini, G.F. Paciotti, C.W. Song et al., Enhancement of tumor thermal therapy using gold nanoparticleassisted tumor necrosis factor delivery, Mol Cancer Ther. 5(2006) 1014–1020. [2] J. Barman, K.C. Sarma, M. Sarma, K. Sarma ,Structural and optical studies of chemically prepared nanocrystalline thin films, Indian Journal of Pure and Applied Physics., 46(2008) 339 [3]. J.P. Bora ,J.Barman and K.C. Sarma, Effect of pH on ZnS nanocrystalline thin film embedded in a polyvinyl alcohol matrix , International Journal of modern physics B Vol. 24, No. 29 (2010) 5663–5673.

[4]. J.Barman, K.C. Sarma, Structural and optical properties of CdS nanoparticles, Indian Journal of phys, 82(7) (2008), 855

[5]. J.Barman ,Structural and optical properties of Zinc Oxide Quantum dot and application in optoelectronics and water treatment, International Journal of Nanoscience and Nanotechnology, 2015; 5(2): 25-28

ABSTRACT:The composite material nickel doped lithium manganese oxides has been prepared by simple molten salt method to enhance the electrical property. X-ray diffraction pattern of the material revealed the formation of cubic spinel structure with fd3m space group. The presences of functional groups were identified by FT-IR spectrum. The formation of sub-micron sized polyhedral shape of the particles was studied with the help of SEM analysis. Electrical studies were carried out using HIOKI LCR meter for wide range of temperatures (100oC-400oC) and maximum conductivity has been obtained as 7.01 x 10-5S.cm-1 at 400oC.

Keywords: Li-ion batteries, cathode, Ni doped, polyhedral shape, conductivity analysis.

[1]. Wei Wang, Bo Jiang, WeiyiXiong, Zhen Wang, Shuqiang Jiao, A nanoparticle Mg-doped Li4Ti5O12for high rate lithium-ion batteries, Electrochimica Acta, 114 (2013) 198– 204.
[2]. Ok Kyung Park, Yonghyun Cho, Sanghan Lee, Ho-Chun Yoo, Hyun-Kon Song and Jaephil Cho, Who will drive electric vehicles, olivine or spinel? Energy and Environmental Science, 4 (2011) 1621.
[3]. V.D. Nithya, R. KalaiSelvan, Kumaran Vediappan, S. Sharmila, Chang Woo Lee, Molten salt synthesis and characterization of Li4Ti5−xMnxO12 (x = 0.0, 0.05 and 0.1) as anodes for Li-ion batteries, Applied Surface Science, 261 (2012) 515– 519.
[4]. Dong Luo, Guangshe Li, Xiangfeng Guan, Chuang Yu, Jing Zheng, Xinhui Zhang and Liping Li, Novel synthesis of Li1.2Mn0.4Co0.4O2 with an excellent electrochemical performance from -10.4 to 45.4oC, Journal of Materials Chemistry A, 1 (2013) 1220.
[5]. S.Soiron, A.Rougier, L.Aymard, J-M.Tarason, Mechanochemical synthesis of Li-Mn-O spinels: positive electrode for lithium batteries, Journal of Power Sources, 97-98 (2001) 402-405.