Showing papers by "All Saints' College published in 2016"
TL;DR: In this paper, a transparent glass system was characterized using UV-visible and Fourier transform infrared spectroscopy (FT-IR) spectra, and it was shown that the glass system behaves as a direct band gap semiconductor.
Abstract: Transparent glasses are widely used for making optical and electronic devices. Transparent 20SrO–(15−x)Bi2O3−xCeO2–65B2O3 (0 ≤ x ≤ 5, mol%) glasses are prepared via melt-quench technique and characterized using UV–visible and Fourier transform infrared spectroscopy (FT-IR) spectra. The ac conductivities of the glasses increase within the addition of CeO2. The physical parameter, density of the glass samples are characterized by Archimedes’ method. The optical absorption studies show that the present glass system behaves as a direct band gap semiconductor. The FT-IR studies show that the glasses are made up of [BO4] and [BO3] structural units. The conductivity analysis suggests that the charge transport occurs through the participation of nonbridging oxygen atoms.
25 citations
TL;DR: In this article, the phase formation of the powder samples were confirmed by taking X-ray diffraction analysis and the mechanoluminescence (ML) property of the samples by impact method was studied by using ML measuring apparatus.
14 citations
TL;DR: In this article, the authors presented the climatology of prevailing horizontal winds in the 0-98 km region over an equatorial station Thiruvananthapuram, which was derived by making use of monthly mean zonal and meridional winds obtained from four decades of balloon flights (1970-2010), three decades of rocket flights (1971-1993, 2002-2007) and one decade of SKiYMET meteor wind radar (2004-2014) observations.
Abstract: The climatology of prevailing horizontal winds in the 0-98 km region over an equatorial station Thiruvananthapuram is presented here. The climatology of horizontal winds is derived by making use of monthly mean zonal and meridional winds obtained from four decades of balloon flights (1970-2010), three decades of rocket flights (1971-1993, 2002-2007) and one decade of SKiYMET meteor wind radar (2004-2014) observations. The observed climatology is compared with the global scale wave model (GSWM-09), and similarities and differences are discussed. Seasonal trends in the horizontal winds and features specific to the equatorial region are also discussed.
3 citations
TL;DR: In this paper, the authors evaluated the water quality of three major sub-tributaries of Shendurney river viz. Kallar, Uruliyar and Kallada, and the results revealed a general trend of increasing pollution load from upstream to downstream.
Abstract: Water pollution is a major problem worldwide, the management of which requires continuous monitoring and the effective implementation of water resource policy at all levels. The objective of the present study is to evaluate the water quality of three major sub-tributaries of Shendurney river viz. Kallar, Shendurney and Uruliyar which drains through the Shendurney wildlife sanctuary which also forms the catchment of the Kallada reservoir. The reservoir was also brought into the purview of the study and the results revealed a general trend of increasing pollution load from upstream to the downstream. Values of parameters such as pH and DO are higher in samples from the upstream whereas the BOD values which indicate the high concentration of organic matter is higher in the downstream portion of the three streams. The results of the study indicate the deterioration caused due to human interference in the outer and buffer zones of the protected area.
3 citations
01 Dec 2016
TL;DR: This paper proposes a analysis approach for characterizing the broadband Log Periodic Planar Dipole Array (LPPDA) antenna useful for C-band applications and performs parametric analysis using CST software.
Abstract: This paper proposes a analysis approach for characterizing the broadband Log Periodic Planar Dipole Array (LPPDA) antenna useful for C-band applications. A simplest geometry of the edge fed Log Periodic Planar Dipole Array is designed and developed. Parameters like length, width of the elements, and spacing between elements are the varied using defined scale factor (τ) and a spacing factor (σ), keeping others constant and their impact was noted down. A parametric analysis is performed. using CST software. A transmission line equivalent circuit of the proposed LPPDA is constructed. Log periodicity behaviour of the proposed antenna is checked by plotting input impedance with respect to logarithm of frequency. An antenna is fabricated and measured in laboratory.
2 citations