Ilocos, Philippines
Ilocos, Philippines

The Union Christian College, Aluva is one of the prominent educational institutions in Kerala, India. It is situated to the north of Aluva in Ernakulam District.Founded in 1921 as a centre of Christian Higher Education, UC College is an inter-denominational cooperation venture among four major Kerala Christian denominations, Church of South India, Malankara Orthodox Syrian Church, Mar Thoma Syrian Church, and Malankara Jacobite Syrian Church.The college was affiliated to The Travancore University and is now affiliated to Mahatma Gandhi University, Kottayam. Wikipedia.


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Anila E.I.,Union Christian College | Jayaraj M.K.,Cochin University of Science and Technology
Journal of Luminescence | Year: 2010

Photoluminescence (PL) and electroluminescence (EL) of SrS:Cu,F alternating current thin film electroluminescent (ACTFEL) device prepared by electron beam/thermal multi-source evaporation are presented. The active layer was grown at 380 °C and neither post-deposition annealing nor sulphur co-evaporation was performed. Two bands at 380 and 435 nm were present in the PL spectrum, which are suggested to be due to donor acceptor recombination. EL spectrum consisted of an additional band at 535 nm, which is attributed to Cu+ intracenter emission. The device exhibited yellowish white EL emission with chromaticity coordinates x=0.25, y=0.27 and low threshold voltage. © 2010 Elsevier B.V. All rights reserved.


Anila E.I.,Union Christian College | Jayaraj M.K.,Cochin University of Science and Technology
Journal of Alloys and Compounds | Year: 2010

The fundamental optical properties of dysprosium (Dy) doped strontium sulfide bulk samples for various dopant concentrations from 0.1 to 1.0 at.% were investigated by X-ray diffraction (XRD), electron paramagnetic resonance spectroscopy (EPR), room temperature photoluminescence (PL), photoluminescence excitation (PLE) and diffuse reflectance spectroscopy (DRS). Investigations by electron paramagnetic resonance yielded the state of Dy in the sample as Dy 3+. An additional ESR line due to F+ center was observed. The PL emission spectrum consisted of several intense lines and a number of weaker ones which were identified as transitions between energy levels of Dy3+. The optimum doping concentration for maximum intensity was found to be 0.25 at.%. Blue shift of the absorption edge energy and red shift of the PLE spectrum were observed with increasing doping concentration. The former is due to Burstein-Moss (BM) effect and the latter is attributed due to the presence of band tailing states. © 2010 Elsevier B.V. All rights reserved.


Philip R.R.,Union Christian College | Dhanya S.,Union Christian College | Namitha Ashokan T.,Cochin University of Science and Technology | Pradeep B.,Cochin University of Science and Technology
Journal of Physics and Chemistry of Solids | Year: 2011

Polycrystalline thin films of CuIn2.95Ga0.05Se 5 produced by the incorporation of Ga into the ordered vacancy compound CuIn3Se5 by a two-stage vacuum evaporation process were structurally, compositionally and optically characterized using X-ray diffraction, energy dispersive analysis of X-rays and optical absorbance measurements. From the X-ray diffraction data of the films, the structural parameters like lattice constants, tetragonal deformation, bond lengths and anion displacement were evaluated and their effect on the optical behavior of films was discussed. The Hopfields quasi-cubic model adapted for chalcopyrites with tetragonal deformation was used to elucidate the crystal field and spin orbital splitting parameters in the uppermost valence band of the compound, using the three energy gaps 1.649, 1.718 and 1.92 eV corresponding to the threefold absorption in the fundamental absorption region of the optical spectra of these films. The percentage contributions of Se p and Cu d orbitals to pd hybridization in this compound were calculated using linear hybridization of orbitals model and the effects of pd hybridization on the band gaps were studied. © 2011 Elsevier Ltd. All rights reserved.


Urmila K.S.,Cochin University of Science and Technology | Asokan T.N.,Cochin University of Science and Technology | Philip R.R.,Union Christian College | Ganesan V.,UGC-DAE Consortium for Scientific Research | And 2 more authors.
Physica Status Solidi (B) Basic Research | Year: 2014

Polycrystalline copper selenide thin films of composition Cu7Se4 with thickness of the order of 350nm are deposited on glass substrates at a temperature of 498±5K and pressure of 10-5mbar using reactive evaporation with high purity copper (99.999%) and selenium (99.99%) as the elemental starting materials. X-ray diffraction (XRD) shows the formation of Cu7Se4 thin films. Structural parameters such as lattice constant, particle size, dislocation density, number of crystallites per unit area and strain in the film are evaluated. The surface morphology and composition of the film are studied using 2D and 3D atomic force microscopy (AFM) and energy dispersive analysis of X-rays (EDAX), respectively. Hall effect measurement is done at room temperature to determine the conductivity type, carrier concentration, carrier mobility and Hall coefficient of the film. The carrier concentration of the film at room temperature is found to be nearly 1021cm-3 suggesting that the prepared films are degenerate semiconductors. The films possess a direct allowed transition with an optical band gap of 2.25eV. High reflectance and low transmittance of the film in the near-infrared region - a behaviour, which is typical of degenerate semiconductors is related to its high electrical conductivity (∼103Ω-1cm-1). Temperature variation of thermoelectric power (TEP) and electrical conductivity also suggests degenerate semiconductor like behaviour of the film. The observed positive Seebeck coefficient indicates p-type conduction mechanism. The data from the analyses of Hall measurements and TEP have been combined to evaluate important material parameters such as mean free path, relaxation time, Fermi energy and effective mass. Certain possible applications of the prepared film in various fields are also discussed. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Chakraborty A.,Union Christian College | Chand B.,Education College | Mondal B.C.,Sponsored Teachers Training College
Journal of the Indian Chemical Society | Year: 2013

Science educators have agreed that understanding of chemical bonding is the basis of chemistry education. In this field, many articles dealing with the problem of learning difficulties of students in the concept of mole, chemical equilibrium, solutions, electrochemistry and atomic structure can be found in the science education literature. Learning science is a cumulative process where new information is added to students' existing knowledge, constructing the knowledge based on what they already have. What students do with information which is presented to them depends largely on what they already think and believe. Constructivist approach seems to be effective in providing meaningful learning. According to this approach, this kind of learning can take place only when the learner relates the new information to his already existing knowledge. Knowledge cannot be transmitted to the learner's mind from a textbook or by the teacher. Instead, students construct their knowledge by making links between their ideas and new concepts through experience they acquire in school or society. Teacher, thus, must help students' correct alternative conceptions and assist meaningful learning. In this article we have concentrated the basic misconceptions of students to explain different types of chemical bonds and advocate some measures to eradicate the misconceptions related to chemical bonding.


Maniyan P.,Union Christian College | Shivakumar B.L.,Sri Ramakrishna Engineering College
International Journal of Applied Engineering Research | Year: 2015

This paper surveys on the importance of human nail analysis through digital image processing for the prediction of various systemic and dermatological diseases. This paper covers the various diseases that can be predicted through nail analysis and on how a model for nail analysis can easily assist the medical practitioners in detecting various diseases. © Research India Publications.


Gupta M.,Guru Nanak Dev University | Gupta M.,D A V College | Gupta M.,Sri Guru Gobind Singh College | Anu,Union Christian College | And 2 more authors.
Materials Today: Proceedings | Year: 2016

A comparative study on physico-chemical analysis of Cd ferrites nanofabricated by sol-gel method using citric acid as a complexing agent, with/without aqueous ammonia as a combustion process chemical additive (CPCA) has been carried out. Ferrites obtained by two different methods were characterized by various spectroscopic techniques and reveal that CPCA helps in the nanofabrication of ferrites (38 nm) at a lower temperature (500°C), with high surface area (14.5067 m2/g) and novel electro-magnetic parameters(MS = 5.4273 emu/g). © 2016 Elsevier Ltd.


Bindu K.R.,Sree Sankara Vidyapeetom College | Martinez A.I.,CINVESTAV | Vasudevan P.,Mahatma Gandhi University | Unnikrishnan N.V.,Mahatma Gandhi University | Anila E.I.,Union Christian College
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2012

We report the synthesis and characterization of nanostructured ZnS powders without using any capping agent. The synthesis was carried out by the wet chemical method. From X-ray diffraction analysis, it was found that nanostructured ZnS exhibited the cubic structure with an average size of 2.5 nm. High resolution transmission electron microscopy (HR-TEM) observations revealed the cubic structure with grain size of around 2.5 nm. In the UV-vis absorption spectrum, the absorption peak shows a blue shift with respect to bulk ZnS. The particle size estimated by considering the effective mass approximation is 2.1 nm. Photoluminescence spectrum exhibits two peaks at 360 nm and 450 nm. The emission color is blue for excitation at 245 nm with CIE coordinates x=0.14 and y=0.038 and it is bluish white when excited at 360 nm with CIE coordinates x=0.2 and y=0.36. It is demonstrated that quantum confinement effects are present in the nanostructured powders without the addition of any capping agent. © 2012 Elsevier B.V.


Archanayadav,Union Christian College
International Journal of Pharma and Bio Sciences | Year: 2013

Aluminum third most abundant element of earth's crust usually found in bounded form due to its highly reactive nature. Different environmental factors and pollutants decrease yield of food crops. During this study toxicity of aluminum on drought variety of gram (Cicer arietinum variety RSG - 973) was recorded on different parameters. Aluminum decreases its root- shoot length, biomass, dry weight, and R/S ratio at different concentrations; but nutrient supply (Hoagland's medium) decreases the toxic effects.


Safeera T.A.,Union Christian College | Anju K.J.,Union Christian College | Joffy P.J.,Union Christian College | Anila E.I.,Union Christian College
AIP Conference Proceedings | Year: 2013

ZnS is a promising II-VI semiconductor with wide applications in optoelectronic devices. We report the synthesis of nanostructured ZnS thin film by chemical spray pyrolysis (CSP). Previous reports on ZnS thin films prepared by spray pyrolysis have been found to be of cubic structure at deposition temperatures below 500°C. Here we report the synthesis of ZnS thin film with hexagonal structure at a deposition temperature of 350°C. XRD result showed that the film was hexagonal in structure with average grain size 20nm. From the absorption studies the band gap was found to be 4.04eV. © 2013 American Institute of Physics.

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