IOSR-JAP   Volume-3 ~ Issue-6 ~ May–June 2013

Abstract: We report on the 130 MeV Ni ion irradiation induced modification of the surface roughness of DLC films grown by microwave plasma CVD method. The MWCVD system which was used to grow the DLC thin films was designed and developed in-house. The growth of thin films of DLC was studied with different substrate dc bias using Ar/H2 (2%) and Methane as feedstock. The deposited films were irradiated with 130 MeV Ni ion irradiation to doses of 3e11, 3e12 and 1e13 ions/cm2. Atomic force microscopy and Raman spectroscopy were used to study the 130 MeV Ni ion irradiation induced modification of surface topography and structure of the DLC films. Raman spectroscopy results of the deposited films show D and G bands at 1380 cm-1 and 1558 cm-1 characteristic of DLC films and indicate change in sp3 content with change in –dc bias. The Atomic force microscopy results show that the deposited DLC films have smooth surface and the RMS roughness decreased in the irradiated films relative to the pristine film which can be due to the electronic energy loss of 130 MeV Ni ions being lower than the energy loss threshold for track formation.

Key words : MWCVD, DLC, raman, direct dc bias, RMS surface roughness.

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Abstract: Single crystals of cadmium mercury tetrathiocyanate dimethylsulphoxide [CdHg(SCN)4(H6C2OS)2],CMTD was conveniently grown from a DMSO-water mixed solvent by slow evaporation technique. The good quality single crystal has been harvested in a period of 40-45 days. Different characterization studies have been carried out for finding its suitability in device fabrications. The lattice parameters of the crystal have been studied by single crystal X-ray diffraction analysis and the crystal system was identified as Orthorhombic. The Fourier transform infrared spectrum of CMTD has been recorded in the region 450-4000 cm-1 to identify the presence of functional groups. The optical studies have been carried out and it was found that the tendency of transmission observed from the specimen with respect to the wavelength of light is practically more suitable for opto-electronic applications. The photoconductivity studies confirm that the title compound has negative photoconducting nature. The relative second harmonic generation efficiency of the crystal has been tested by Kurtz-Perry powder technique.

Keywords: organometallic, non-linear optical crystals, characterization, synthesis, X-ray diffraction, dimethylsulphoxide

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Abstract: SITUS INVERSUS TOTALIS is a congenital positional anomaly characterized by transposition of abdominal viscera associated with a right sided heart (Dextrocardia) .It was Mathew Baillie who first described situs inversus totalis in early twentieth century. A transposed thoracic and abdominal organ is a mirror image of the normal anatomy when examined or visualized by tests such as x-ray filming. The term situs inversus is a short form of the Latin meaning inverted position of the internal organs. Generally individuals with situs inversus totalis are asymptomatic and have a normal life expectancy. Many people with situs inversus totalis are unaware of their unusual anatomy until they seek medical attention for an unrelated condition. The reversal of the organs may lead to some confusion as many signs and symptoms will be on the reverse side. A 27 years old male patient reported to the Department of Nephrology with the c/o left sided flank pain since 1 week. The Chest X-ray, Ultrasonography, CT scan and MRI were done and he was diagnosed as SITUS INVERSUS TOTALIS. The anatomic, pathologic, embryologic and etiology of complete Situs inversus and related abnormalities are presented in this case with special emphasis to genetic correlation.

Key words: Situs inversus totalis, Dextrocardia, Congenital, Transposition, Thoracic and abdominal organs.

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Abstract: We present the result of a preliminary assessment of radio-frequency radiation exposure from selected mobile base stations in Ajaokuta environs. The Power density of RF radiation within a radial distance of 125m was measured. Although values fluctuated due to the influence of other factors, including wave interference from other electromagnetic sources around reference base stations, we show from analysis that radiation exposure level is below the standard limit (4.5W/m2 for 900MHz and 9W/m2 for 18000MHz) set by the International Commission on Non-ionizing Radiation Protection (ICNIRP) and other regulatory agencies.

Keywords – Ajaokuta environ, Electrosmog meter, ICNIRP, Base station site, Non-ionising radiation

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Abstract: The present paper deals with the analysis of unsteady free convection heat and mass transfer flow through a non-homogeneous porous medium with variable permeability bounded by an infinite porous vertical plate in slip flow regime taking into account the radiation, chemical reaction and temperature gradient dependent heat source. The flow is considered under the influence of magnetic field applied normal to the flow. The permeability of the porous medium and the suction velocity at the plate decrease exponentially with time about a constant mean. Approximate solutions for velocity, temperature and concentration fields are obtained using perturbation technique. The expressions for skin-friction and rate of heat transfer and rate of mass transfer are also derived. The results obtained are discussed for cooling case (Gr>0) of the plate. The effects of various physical parameters, encountered into the problem, on the velocity field are numerically shown through graphs while the effects on skin-friction and rate of heat and mass transfer are numerically discussed with the help of tables.

Key words: MHD, Free convection, heat and mass transfer, radiation, non homogeneous porous medium, temperature gradient dependant heat source and chemical reaction.

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Abstract: Nano particles of Cu0.61-xCoxZn0.39Fe2O4 (0 ≤ x ≤ 0.5) synthesized through sol-gel auto combustion method. Nitrates of elements and citric acid are used as starting materials. X-ray Diffraction, Thermo Gravimetric Analysis and Vibrating Sample Magnetometer are used to analyze the properties. Effect of variation in the Co substitution and its impact on particle size, lattice constant, density, cation distribution, ferritization temperature, associated water content, magnetic properties like saturation magnetization(MS), coercivity(HC) and remanent magnetization(Mr) is observed. Lattice parameter increases with increasing Co+2 concentration whereas X-ray density, bulk density decreases with the Co+2 content. In Cation distribution the Co and Cu ion show preference towards octahedral B-site, Zn occupy A site whereas Fe occupy both A and B site. Cation redistribution takes place for x > 0.3. Saturation magnetization increases from (x ≤ 0.3). For x > 0.3, Ms decreases suggesting that significant canting exists at B site. However, coercivity, magnetocrystalline anisotropy and remanant magnetization increases with the Co2+ substitution.

Keywords: Coercivity(HC), Remanent and Saturation Magnetization , Sol-gel synthesis, Thermo Gravimetric Analysis and Vibrating Sample Magnetometer, X-ray Diffraction.

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Abstract: In this paper a linear relationship in stellar optical spectra has been found by using a spectroscopical method used on optical light sources where it is possible to organize atomic and ionic data. This method is based on a new intensity formula in optical emission spectroscopy (OES). Like the HR-diagram , it seems to be possible to organize the luminosity of stars from different spectral classes. From that organization it is possible to determine the temperature , density and mass of stars by using the new intensity formula. These temperature, density and mass values agree well with literature values. It is also possible to determine the mean electron temperature of the optical layers (photospheres) of the stars as it is for atoms in the for laboratory plasmas. The mean value of the ionization energies of the different elements of the stars has shown to be very significant for each star. This paper also shows that the hydrogen Balmer absorption lines in the stars follow the new intensity formula.

Keyword: Astrophysics, Emission Spectroscopy Linear, Relationships.

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Abstract: Nano-sized Carbon materials are synthesized from edible oils by a simple pyrolysis route. Three different vegetable oils, coconut oil with medium chain fatty acid, Mustard oil with short chain fatty acid, and Gingelly oil with long chain fatty acid were selected as precursors. The process conditions were an open air laboratory atmosphere and no chamber or inert gas ambient was used. The prepared agglomerates were subjected for Atomic absorption analysis to investigate their chemical contents. X-ray diffraction analysis was performed to analyze the crystallinity of the samples. A Fourier transform infrared spectroscope (FTIR) was used to identify the inorganic components and surface organic functional groups of the grown material. The electrical conductivity of the sample is investigated by conventional four probe method within a temperature range of 30 to 180 Degree Celsius. SEM micrographs reveal the Carbon powder constituted very fine and quasi spherical particles which are aggregated and the size of the particle ranges from 60 nm to 90nm.

Key Words: Edible oils, Tryglycerol, Carbon nano material, Pyrolysis, Carbonisation .

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