IOSR-JAP   Volume-6 ~ Issue-6 ~ Nov-Dec 2014

ABSTRACT: The solvent dependence of the peptides, N-for-Met-Tyr-Ala-OMe and N-for-Leu-Tyr-Gly-OMe, at different concentration of DMSO-d6 using H-1 and 2D-NOESY NMR is studied. The investigated peptides indicate that chemical shifts of the NH values lie between 6.33 and 6.85, where Gly NH is 6.33 ppm, Leu NH is 6.85 ppm and Tyr NH is 6.64 ppm. The differences of chemical shifts are significantly identified. From the results, it is observed that when solvent concentration is increased, Leu NH protons are in slow exchange situation and signal for NH proton appears as a doublet. This disappears at 100% DMSO-d6 concentration. The NOESY spectrum of the peptides is obtained at 20mM concentration in DMSO-d6. Based on the analysis of the spectra from solvent dependence and the NOESY experiments, intermolecularly hydrogen bond conformers such as ones are proposed for the peptides. The formation of hydrogen bond between the amide NH proton and DMSO-d6 explains the downfield shift of the NH protons and upfield shift of the formyl H. The conformers explain a cross peak observed between the two groups in the NOESY spectrum of the peptides and these conformers support the conclusions arrived at from various NMR studies.

Keywords: Peptides, Conformational Studies, H-1 and 2-D NMR

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ABSTRACT: The silver sulfide (Ag2S) nanocrystalline thin films have been prepared on the glass substrate by successive ionic layer adsorption and reaction (SILAR) technique at 40 oC. Several sets of films were prepared by keeping number of cycles of immersion as 20, 30, 40, and 50 and the effects of number of immersion cycles on the structural properties and surface morphology together with the optical and electrical properties are studied. The XRD studies showed that the number of immersion cycles affect the crystallinity and the peak intensity of (1 2 0 ) plane increases with the immersion cycles. The morphology of the films was characterized by field emmission scanning electron microsopy (FE-SEM).

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ABSTRACT: In this contribution, a comparative study on the theoretical efficiency and experimental efficiency of silicon solar cell has been carried out. By modifying the surface recombination velocity equation and accommodating required standard equations, a modified version of spectral p-n junction model has been developed and by using this model the theoretical efficiencies of silicon solar cell have been simulated as 20.9% and 22% for airmass AM1.5G global and AM 1.5D direct normal under one sun condition respectively using MATLAB (R2010a). The experimental efficiency of this same cell has been determined as 13.5% for airmass AM1.5 by using solar simulator (Sun Simulator K3000 LAB55). Finally, a comparison has been done among these efficiencies and found that the main cause for this deviation among these efficiencies is the short circuit current density.

Keywords: Comparative study, experimental efficiency, theoretical efficiency and solar cell.

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ABSTRACT: A solid biopolymer electrolytes (BEs) based on hydroxypropyl methylcellulose (HPMC) doped with different concentrations of ceric ammonium nitrate (NH4)2Ce(NO3)6 (CAN) were prepared by solution cast method. Different techniques has been employed to investigate the effects of structural, thermal and ionic conductivity behavior of these polymer electrolyte films upon gamma irradiation with different doses of 20, 60 and 100 kGy. The dissolution of the salt into the polymer host and the structural properties of pure and CAN (0.5% - 2%) (wt. %) complexed HPMC polymer electrolyte films before and after irradiation was confirmed by X – ray diffraction (XRD) studies. XRD results revealed that the amorphous domains of HPMC polymer matrix was increased with increase in the salt concentration and with the gamma dose. The percentage of crystallanityis found to be high in pristine unirradiated HPMC films.

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ABSTRACT: A new semiorganic non-linear optical crystal of Di-Ammonium Hydrogen Phospho Tartrate (DAHPT) was grown successfully by slow evaporation technique. The grown crystal was subjected to different characterization in order to test its suitability for device fabrication. The lattice parameters of the grown crystals were determined by single crystal X-ray diffraction technique and the crystalline nature of the grown crystal was confirmed by powder XRD analysis. The presence of the functional groups in the crystal lattice was confirmed by FTIR spectral analysis. The elements present in the grown crystal was confirmed by EDAX. The UV-Vis-NIR spectrum of DAHPT shows zero absorbance in the entire visible region which enables it to be suitable for optical applications. Thermal stability of DAHPT was determined from TG/DTA curves. The SHG activity of the grown crystal was confirmed by Kurtz-Perry powder technique. The mechanical strength of the crystal was determined by Vickers hardness test.

Keywords: L-Tartaric acid, Crystal growth, EDAX, Optical properties, Thermo-gravimetric analysis

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ABSTRACT: Pure Manganese sulphide thin films have been deposited on commercial glass substrates by chemical bath deposition method. Experimental results show that pre-treatment of the substrates by HF etching play an important role in the formation of crystalline films. The structure and morphology of the obtained manganese sulphide thin films were characterized for thickness, X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX) and optical absorption spectroscopy. XRD measurements show that all the films are crystallize in the wurtzite phase. SEM studies confirm crystalline nature of films with grain size varying in the range between 1-2 μm. EDAX analysis shows that average ratio of atomic percentage of Mn:S is 1:1.The optical band gap of thin film is found to be 2.7 eV.

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ABSTRACT: This paper presents impact of noise on the environment and the analysis of noise bother by survey method in Itu Local Government Area. Noise level measurements with a sound level meter at selected locations were conducted. The selected locations which included schools, churches, markets, workshops/factories, roads/streets and road junctions/parks were taken as interview areas, hence, copies of questionnaires were distributed and the results were analysed using the Percentage Analysis Method (PAM). The results of the findings reveal that noise creates negative impact in Itu Local Government Area. The results of the findings reveal that there are numerous sources of noise in Itu Local Government Area. They include traffic, workshops/factories and compact disk sellers, among others. Workshop/factory noise bothers them most. Also, the results of the findings reveal that there is no well-defined relationship between levels of noise and degree of bother, instead the degree of bother increases as energy content of the noise increases. Keywords: Analysis, environment, impact, Itu Local Government Area, noise,

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