Vol. 2 & Issue 3 ; Section C : Physical Sciences

Date : May. to Jul.2012

 

Suitable Vertical and Horizontal Shadow Angles for Shading Devices at Port Blair, India

Amita Maurya, Usha Bajpai

  • Abstract

    In this paper an analysis has been carried out using the design method based on solar path diagram for the suitable shadow angles required to protect the windows from direct entry of solar radiation for buildings in Port Blair. These results are concluded by drawing overheated periods on a stereographic sun path diagrams for Port Blair and possibility of shading and shading devices are estimated. The vertical shadow angle () and horizontal shadow angle (

Negative ion mode mass spectrometry- an overview

Pavani Challamalla, Somsubhra Ghosh, N. Parthiban, K. N. V Rao and David Banji

  • Abstract

    Negative ion mode Mass spectrometry is the most comprehensive and versatile tool. Recent advances in negative ion mode mass spectrometry have improved sensitivity, identification and elucidation of organic and inorganic compounds. All compounds will not produce negative ions but many important compounds of environmental or biological interest can produce negative ions under the right conditions. For such compounds, negative ion mode mass spectrometry is more efficient, sensitive and selective than positive ion mass spectra. In this review, discuss the overall framework of the negative ion mode mass experiments into its key components, such as principle, ionization techniques, instrumentation, fragmentation and applications.

Structural and optical studies of thermally evaporated CdSexTe1-x thin films

S.S.Patil  and P.H.Pawar

  • Abstract

    Using CdSe and CdTe powders (Sigma-Aldrich 99.99+ % purity) in molecular stoichiometry proportional weights, the ternary thin films of CdSex Te1-x of different compositions were deposited onto well cleaned glass substrates by thermal evaporation in vacuum (≈10-5 Torr). The selected samples were annealed at 400 K for 30 min. in vacuum and used for the characterization. The XRD study shows that all the films are polycrystalline exhibiting single phase (zinc blend structure) with strong preferential orientation of the crystallites along (111) C direction for all compositions. The d-values and lattice parameter values ‘a’ for the cubic phase have been determined and are observed to vary with composition according to Vegard’s law. The Micro-structural parameters such as grain size, dislocation density and strain have been evaluated and their composition depen

Frequency Distribution of Noise Due to Cutting Machines

K. B. Patange , Nazneen Akhter, S. H. Behere and Yusuf H Shaikh

  • Abstract

    Urban activities of various kinds are contributing to sizable noise and it is becoming serious concern. The noise is found to have serious effects on quality of life, particularly with reference to health and psychology. In view of this, the study of noise assumed importance in recent times. In urban areas, most of the noise comes from traffic, heavy industry, construction activity and machinery. The noise resulting from traffic and similar activities is found to be prominent at lower frequencies. We studied the noise contributed by cutting machines mostly used during construction activity. The noise was recorded and data analyzed for frequency distribution and it was found that there is qualitative difference in the frequency distribution of noise as compared to noise due to other sources. The noise due to cutting machines is found to be spread over a wide range of frequencies in contrast to that due to other

Time Series Analysis of Kaprekar’s (Constant) Number

Yusuf H Shaikh, K. B. Patange , Nazneen Akhter  and S. H. Behere

  • Abstract

    It is observed that Kaprekar discovered a constant which was named after him. The number of steps required to arrive at the Kaprekar’s number for all the four digit numbers change randomly. The Rescale Range Analysis of Sequence of these random numbers is carried out and interesting results are presented.

Study in Glycerol-Azure A-NaLS System: Solar energy conversion

R.K.Gunsaria, S.S.Nadeem and Ram Narayan Meena

  • Abstract

    Solar energy conversion and storage by use of photogalvanic cell was studied in Glycerol –Azure ANaLS System. Photogalvanic effect was studied in photogalvanic cell consisting of Glycerol as a reductant, Azure A as photosensitizer and NaL as surfactant in aqueous solution. The photopotential and photocurrent generated were 855.0 mV and 250 μA respectively. The observed power of the cell was 213.75μW at its power point. The conversion efficiency and fill factor was determined as 1.1826 and 0.4762 respectively. The cell performance was 63 min. in dark. A mechanism for the photogeneration of electricity has also been proposed. The effect of different parameters (pH, diffusion length, electrode area, light intensity) on the electrical output of the cell were also been observed

Vibrational studies of LiN2H5SO4 crystals

Azha.Periasamy and S.Muruganand

  • Abstract

    Vibrational assignments have been made for the lithium hydrazinium sulphate crystals. The crystals were grown using aqueous solution method. The grown crystals were characterized by FTIR and Raman spectra. The study of the crystals showed ferroelectric in nature at room temperature with a spontaneous polarization along c axis.

Dielectric and emissive behavior of red soils of North Maharash

Avinash.A.Patil, D.V.Ahire and P.R.Chaudhari

  • Abstract

    The dielectric properties of red soil have been study with various percentage of moisture content. Microwave transmission line waveguide technique has been used for this purpose. The dielectric properties including dielectric constant (ε’) and dielectric loss (ε”) have been measured for the red soil samples collected from the three places located each in the Dhule (S1,S3) and Jalgaon (S2) districts of north Maharashtra region (India) at 9.2 GHz frequency of varied moisture content at X-band . The experimental observations shows that the dielectric constant of these red soil samples increased from about 2.69 to 19.5 for sample S1, 2.65 to 19.2 for sample S2 and 2.53 to 20.2 for sample S3, when its corresponding gravimetric MC changed from 0 % (oven dry) to around 30 %. Estimations of emissivity ep(

Structural and Transport Properties of PbTe Thin Films by Thermal Evaporation

U. P. Khairnar, S. S. Behere, and P. H. Pawar

  • Abstract

    Thin films of lead telluride (PbTe) of thicknesses from 500 Å to 3000 Å have been prepared by physical evaporation technique, onto precleaned amorphous glass substrates at constant substrate temperature. The deposited samples were annealed and annealed samples were used for characterization. Resistivity of these samples was measured by four-probe technique as a function of thickness and temperature. Activation energy for charge transport have been evaluated and found in the range of 0.14 to 0.20 eV. Thermoelectric power has been measured and found to be positive indicating that the samples are p-type semiconducting material. Mobility variation with temperature has been estimated (evaluated) and co-related with scattering mechanism in the entire range of temperature studied. The X-ray diffraction analysis confirmed that films are polycrystalline having cubic structure cell and lattice parameters are

Effect of Substituents on the Photoluminescence Performance of

H.K. Dahule and S.J.Dhoble

  • Abstract

    A series of substituted 2,4 diphenyl quinoline ligands namely (Cl-DPQ),(OMe –DPQ),and M-DPQ) have synthesized. These compounds readily undergo cyclometalation with iridium trichloride and form iridium (III) dopants of the substituted 2,4 diphenyl quinoline ligands. Synthesized compounds emit red color in solid as well as in solution phase. The peak emission wavelength of the dopants (λmax = 610-650 nm) can be tuned depending upon the electronic properties of the methoxy, chloronine and methyl substituents as well as their positions in the 2,4 diphenyl quinoline ring. These synthesized iridium complexes were characterized by 1HNMR, DTA/TGA, XRD, and FTIR . The molecular structure of M-DPQ,OMe-DPQ, Cl-DPQ Ir(M-DPQ)2(acac) ,Ir(OMe-DPQ)2(acac) and Ir(Cl-DPQ)2(acac) is confirmed by the FTIR spectra. The photo physical properties were studied by UV-vis absorption a

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