Nonlinear optical studies of sodium borate glasses embedded with gold nanoparticles
Optical glasses possessing large third-order optical nonlinear susceptibility and fast response times are promising materials for the development of advanced nonlinear photonic devices. In this context, gold nanoparticle (NP)-doped borate glasses were synthesized via the melt-quench method. The nonlinear optical (NLO) properties of thus prepared glasses were investigated at different wavelengths (i.e., at 532nm using nanosecond pulses, at 750nm, 800nm, and 850nm wavelengths using femtosecond, MHz pulses). At 532nm, open aperture (OA) Z-scan signatures of gold NP-doped borate glasses demonstrated reverse saturable absorption (RSA), attributed to mixed intra-band and interband transitions, while in the 750?850nm region, the OA Z-scan data revealed the presence of saturable absorption (SA), possibly due to intra-band transitions. The NLO coefficients were evaluated at all the spectral regions and further compared with some of the recently reported glasses. The magnitudes of obtained NLO coefficients clearly demonstrate that the investigated glasses are potential materials for photonic device applications. 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
Gangareddy J.; Bheemaiah E.; Gandhiraj V.; James J.T.; Jose J.K.; Katturi Naga K.; Soma V.R.
Applied Physics B: Lasers and Optics, Vol-124, No. 10
Gangareddy J., Department of Physics, Bangalore University, Bengaluru, 560056, Karnataka, India; Bheemaiah E., Department of Physics, Bangalore University, Bengaluru, 560056, Karnataka, India; Gandhiraj V., Division of Physics, School of Advanced Sciences, VIT Chennai, Chennai, 600127, Tamilnadu, India; James J.T., Department of Physics, Christ University, Bengaluru, 560029, Karnataka, India; Jose J.K., Department of Physics, Christ University, Bengaluru, 560029, Karnataka, India; Katturi Naga K., Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad, 500046, India; Soma V.R., Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad, 500046, India
Nonlinear radiated MHD flow of nanoliquids due to a rotating disk with irregular heat source and heat flux condition
AA7072-H2O; Nanofluid; Nonlinear radiation; Rotating disk; Ti6Al4V
This research is made to visualize the nonlinear radiated flow of hydromagnetic nano-fluid induced due to rotation of the disk. The considered nano-fluid is a mixture of water and Ti6Al4V or AA7072 nano-particles. The various shapes of nanoparticles like lamina, column, sphere, tetrahedron and hexahedron are chosen in the analysis. The irregular heat source and nonlinear radiative terms are accounted in the law of energy. We used the heat flux condition instead of constant surface temperature condition. Heat flux condition is more relativistic and according to physical nature of the problem. The problem is made dimensionless with the help of suitable similarity constraints. The Runge-Kutta-Fehlberg scheme is adopted to find the numerical solutions of governing nonlinear ordinary differential systems. The solutions are plotted by considering the various values of emerging physical constraints. The effects of various shapes of nanoparticles are drawn and discussed. 2018 Elsevier B.V.
Mahanthesh B.; Gireesha B.J.; Shehzad S.A.; Rauf A.; Kumar P.B.S.
Physica B: Condensed Matter, Vol-537, pp. 98-104.
https://doi.org/10.1016/j.physb.2018.02.009 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042006985&doi=10.1016%2fj.physb.2018.02.009&partnerID=40&md5=cce3b2e5a9586fe7979723096e355ea0
Mahanthesh B., Department of Mathematics, Christ University, Bangalore, 560029, India; Gireesha B.J., Department of Studies and Research in Mathematics, Kuvempu University, Shankaraghatta, Shimoga, 577 451, Karnataka, India; Shehzad S.A., Department of Mathematics, COMSATS Institute of Information Technology, Sahiwal, 57000, Pakistan; Rauf A., Department of Mathematics, COMSATS Institute of Information Technology, Sahiwal, 57000, Pakistan; Kumar P.B.S., Department of Studies and Research in Mathematics, Kuvempu University, Shankaraghatta, Shimoga, 577 451, Karnataka, India
Significance of Darcy-Forchheimer Porous Medium in Nanofluid Through Carbon Nanotubes
CNTs (SWCNT and MWCNT); convective surface condition; Darcy-Forchheimer porous space; nonlinear stretching surface; three-dimensional flow
This article manages Darcy-Forchheimer 3D flow of water based carbon nanomaterial (CNTs). A bidirectional nonlinear stretchable surface has been utilized to make the flow. Disturbance in permeable space has been represented by Darcy Forchheimer (DF) expression. Heat transfer mechanism is explored through convective heating. Outcomes for SWCNT and MWCNT have been displayed and compared. The reduction of partial differential framework into nonlinear common differential framework is made through reasonable variables. Optimal series scheme is utilized for arrangements advancement of associated flow issue. Optimal homotopic solution expressions for velocities and temperature are studied through graphs by considering various estimations of physical variables. Moreover surface drag coefficients and heat transfer rate are analyzed through plots. 2018 Chinese Physical Society and IOP Publishing Ltd.
Muhammad T.; Lu D.-C.; Mahanthesh B.; Eid M.R.; Ramzan M.; Dar A.
Communications in Theoretical Physics, Vol-70, No. 3, pp. 361-366.
Muhammad T., Department of Mathematics, Faculty of Science, Jiangsu University, Zhenjiang, 212013, China, Department of Mathematics, Government College Women University, Sialkot, 51310, Pakistan; Lu D.-C., Department of Mathematics, Faculty of Science, Jiangsu University, Zhenjiang, 212013, China; Mahanthesh B., Department of Mathematics, Christ University, Bengaluru, Karnataka, 560029, India; Eid M.R., Department of Mathematics, Faculty of Science, New Valley Branch, Assiut University, Assiut, 71511, Egypt, Department of Basic Science, Deanship of Preparatory Year, Northern Border University, Arar, 91431, Saudi Arabia; Ramzan M., Department of Computer Science, Bahria University, Islamabad Campus, Islamabad, 44000, Pakistan, Department of Mechanical Engineering, Sejong University, Seoul, 143-747, South Korea; Dar A., Department of Mathematics, University of Kotli Azad, Jammu and Kashmir, Kotli, 11100, India
Brinkman-Forchheimer flow of SWCNT and MWCNT magneto-nanoliquids in a microchannel with multiple slips and Joule heating aspects
Brinkman-Forchheimer model; Carbon nanotubes; Joule heating; Multiple slips; Nanofluid; Porous microchannel
Purpose: The microfluidics has a wide range of applications, such as micro heat exchanger, micropumps, micromixers, cooling systems for microelectronic devices, fuel cells and microturbines. However, the enhancement of thermal energy is one of the challenges in these applications. Therefore, the purpose of this paper is to enhance heat transfer in a microchannel flow by utilizing carbon nanotubes (CNTs). MHD Brinkman-Forchheimer flow in a planar microchannel with multiple slips is considered. Aspects of viscous and Joule heating are also deployed. The consequences are presented in two different carbon nanofluids. Design/methodology/approach: The governing equations are modeled with the help of conservation equations of flow and energy under the steady-state situation. The governing equations are non-dimensionalized through dimensionless variables. The dimensionless expressions are treated via Runge-Kutta-Fehlberg-based shooting scheme. Pertinent results of velocity, skin friction coefficient, temperature and Nusselt number for assorted values of physical parameters are comprehensively discussed. Also, a closed-form solution is obtained for momentum equation for a particular case. Numerical results agree perfectly with the analytical results. Findings: It is established that multiple slip effect is favorable for velocity and temperature fields. The velocity field of multi-walled carbon nanotubes (MWCNTs) nanofluid is lower than single-walled carbon nanotubes (SWCNTs)-nanofluid, while thermal field, Nusselt number and drag force are higher in the case of MWCNT-nanofluid than SWCNT-nanofluid. The impact of nanotubes (SWCNTs and MWCNTs) is constructive for thermal boundary layer growth. Practical implications: This study may provide useful information to improve the thermal management of microelectromechanical systems. Originality/value: The effects of CNTs in microchannel flow by utilizing viscous dissipation and Joule heating are first time investigated. The results for SWCNTs and MWCNTs have been compared. 2018, Emerald Publishing Limited.
Shashikumar N.S.; Gireesha B.J.; Mahanthesh B.; Prasannakumara B.C.
Multidiscipline Modeling in Materials and Structures, Vol-14, No. 4, pp. 769-786.
https://doi.org/10.1108/MMMS-01-2018-0005 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048567522&doi=10.1108%2fMMMS-01-2018-0005&partnerID=40&md5=5672b190726c00b264b2b5412e72f5cc
Shashikumar N.S., Department of Studies and Research in Mathematics, Kuvempu University, Shimoga, India; Gireesha B.J., Department of Studies and Research in Mathematics, Kuvempu University, Shimoga, India; Mahanthesh B., Department of Mathematics, Christ University, Bengaluru, India; Prasannakumara B.C., Department of Mathematics, Government First Grade College, Koppa, India
Enhancements to greedy web proxy caching algorithms using data mining method and weight assignment policy
Classification; Fuzzy bi-clustering; Web proxy caching; Weight assignment policy
A Web proxy caching system is an intermediary between the users and servers that tries to alleviate the loads on the servers by caching selective Web objects and behaves as the proxy for the server and service the requests that are made to the servers by the users. In this paper the performance of a proxy system is measured by the number of hits at the proxy. A higher number of hits at the proxy server reflects the effectiveness of the proxy system. The number of hits is determined by the replacement policies chosen by the proxy systems. Traditional replacement policies that are based on time and size are reactive and do not consider the events that will possibly happen in the future. The outcomes of the paper are proactive strategies that augment the traditional replacement policies with data mining techniques. In this paper, the performances of the greedy replacement policies such as GDS, GDSF and GD* are adapted by the data mining method and weight assignment policy. Experiments were conducted on various data sets. Hit ratio and byte hit ratio were chosen as parameters for performance. 2018 ISSN.
International Journal of Innovative Computing, Information and Control, Vol-14, No. 4, pp. 1311-1326.
https://doi.org/10.24507/ijicic.14.04.1311 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85050560787&doi=10.24507%2fijicic.14.04.1311&partnerID=40&md5=0bad8548cedc93f8cb60bf4363d10ac7
Pernabas J.B., Department of Computer Science and Engineering, Faculty of Engineering, Christ University, Kengeri Campus Mysore Road, Kanmanike, Kumbalgodu, Bangalore, 560074, India; Fidele S.F., Department of Computer Science and Engineering, Pondicherry Engineering College, Pillaichavadi, 605014, Puducherry, India
Effect of multiwalled carbon nanotube alignment on the tensile fatigue behavior of nanocomposites
digital image correlation; fatigue; Multi-walled carbon nanotubes; nanocomposites; nanotube alignment; toughening mechanisms
The one-dimensional structure of carbon nanotubes makes them highly anisotropic, making them to possess unusual mechanical properties, and hence employed as promising nanofiller for the composite structures. However, various carbon nanotube properties are not completely utilized when they are used as reinforcement in composites due to inadequate and immature processing techniques. In the present work, an attempt has been made to utilize the strong anisotropic nature of multi-walled carbon nanotubes (MWCNTs) for improving the fatigue life of nanocomposites only by considering a very low weight percentage (<0.5 wt%). The anisotropy of MWCNTs was imparted into the nanocomposites by aligning them in the epoxy matrix with DC electric field during composite curing. Nanocomposites were made for three MWCNT loadings (0.1, 0.2, and 0.3 wt%). The tensile fatigue behavior was investigated under stress control by applying cyclic sinusoidal load with the frequency range of 13 Hz and stress ratio, R = 0.1. The specimens were tested for the fatigue load until the failure or 1E+05 cycles. The fractured surfaces were examined through scanning electron microscope to analyze the fatigue fracture behavior. A small weight percentage of MWCNT loading (0.2 wt%) into the polymer composite has enhanced on an average 13% to 15% fatigue life, which is encouraging to develop the low cost, improved fatigue life composite structures. Also, the energy dissipation mechanism in MWCNT dispersed nanocomposites has shown a reduced crack propagation rate. The Author(s) 2017.
Journal of Composite Materials, Vol-52, No. 17, pp. 2365-2374.
Jangam S., Structural Technologies Division, CSIR National Aerospace Laboratories, India, Department of Mechanical Engineering, Jawaharlal Nehru Technological University, Anantapur, India, Department of Mechanical Engineering, Faculty of Engineering, Christ University, Bangalore, India; Raja S., Structural Technologies Division, CSIR National Aerospace Laboratories, India; Reddy K.H., Department of Mechanical Engineering, Jawaharlal Nehru Technological University, Anantapur, India
Effect of vacancies on thermopower of molybdenum disulfide monolayers
monolayer MoS2 ; thermopower; vacancies
A detailed theoretical investigation of the effect of scattering of electrons and phonons by lattice vacancies in molybdenum disulfide (MoS2) monolayers (MLs) on diffusion, S d, and phonon-drag, S g, components of thermoelectric power (TEP), S, is presented over a wide-temperature range (1 < T < 300 K) using the Boltzmann transport formalism. The diffusion component is assumed to be influenced, not only by vacancies via short-range and Coulomb disorder scattering, but also by charged impurities (CIs) and acoustic and optical phonons. In the case of S g, the phonons are considered to be scattered, besides the vacancies, by sample boundaries, substitutional isotopic impurities, as well as other phonons via both N- and U-processes. Numerical calculations of S d and S g, as functions of temperature and vacancy defect density are presented for MoS2 MLs with n s = 1017 m-2 supported on SiO2/Si substrates. The role of carrier scatterings by mono-sulfur and mono-molybdenum vacancies in influencing the overall electron and phonon relaxation rates and in determining S d and S g are investigated. The behavior of S d and S g is found to be noticeably influenced by vacancy scattering. The influence on S d is seen to be more for mono-sulfur vacancies for densities lesser than 1%. The influence, is to enhance S d slightly for MLs with realizable CI concentrations. On the other hand, S g is found to depend sensitively on the vacancy disorder for T < 50 K; a S-vacancy density of 0.1% is found to suppress the characteristic peak of S g by almost 60%. The extent of reduction in the characteristic peak of S g, observable in low temperature measurements of S, can provide information about defect density. The calculations demonstrate that defect engineering of MoS2 ML systems can be used to tune their thermoelectric performance. A need for detailed experimental studies is suggested. 2018 IOP Publishing Ltd.
Patil S.B.; Sankeshwar N.S.; Mulimani B.G.
Journal of Physics D: Applied Physics, Vol-51, No. 30
https://doi.org/10.1088/1361-6463/aaccc8 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049966430&doi=10.1088%2f1361-6463%2faaccc8&partnerID=40&md5=ced981d1ec5629fa2a5ca547b0d4f373
Patil S.B., Department of Physics, Karnatak University, Dharwad, Karnataka, 580003, India; Sankeshwar N.S., Department of Physics, Karnatak University, Dharwad, Karnataka, 580003, India, Department of Physics, Christ University, Bangalore, Karnataka, 560029, India; Mulimani B.G., Department of Physics, Karnatak University, Dharwad, Karnataka, 580003, India
On the Motion of Non-Newtonian EyringPowell Fluid Conveying Tiny Gold Particles Due to Generalized Surface Slip Velocity and Buoyancy
Chemical reaction; EyringPowell fluid; Homogeneousheterogeneous reactions; Nonlinear thermal radiation; Paraboloid of revolution; Quartic autocatalysis
In the painting industry, space science and biomedical science, the nature of relaxation in the flow of non-Newtonian fluid (i.e. blood) containing gold (Ag) suits the characteristics of EyringPowell fluid flow induced by generalized surface slip velocity and buoyancy. However, flow of various non-Newtonian fluids on the horizontal surface of a slanted paraboloid of revolution objects (i.e. rocket, as in space science), over a bonnet of a car and over a pointed surface of an aircraft is of importance to experts in all these fields. In this article, the analysis of the motion within the thin layer formed on a horizontal object which is neither a perfect horizontal nor vertical and neither an inclined surface nor a cone/wedge is presented. The transformed governing equations which model the flow was non-dimenzionalized, parameterized and solved numerically using a well-known RungeKutta integration procedure along with shooting technique. The influence of increasing the magnitude of major parameters on the temperature distribution, local heat transfer rate, concentration of the fluid, local skin friction coefficient and velocity of the flow are illustrated graphically and discussed. Velocity slip parameter is found to be a decreasing function of temperature distribution across the flow. Heat transfer rate (NuxRex-1/2) at the wall (?= 0) is an increasing function of velocity slip parameter. Maximum coefficient of concentration of homogeneous bulk fluid at the wall exists at larger values of the emerged velocity slip and volume fraction parameters. 2018, Springer Nature India Private Limited.
Animasaun I.L.; Mahanthesh B.; Koriko O.K.
International Journal of Applied and Computational Mathematics, Vol-4, No. 6
Animasaun I.L., Department of Mathematical Sciences, Federal University of Technology, Akure, Nigeria; Mahanthesh B., Department of Mathematics, Christ University, Bangalore, 560058, India; Koriko O.K., Department of Mathematical Sciences, Federal University of Technology, Akure, Nigeria
Performance Analysis of Novel Compact Octagonal Shaped Fractal Antenna for Broadband Wireless Applications
Fractal antennas; HFSS; Octagon; Return loss; UWB technology; VSWR; Wireless applications
Antenna plays an important role in any part of the communication system. It has to be designed very cautiously to provide improved system performance to meet the developments in wireless technologies with various design constraints such as small size, low cost, high data, low power consumption and wideband capabilities. Several efforts have been made by various investigators around the globe to amalgamate benefits of fractal structures with electromagnetic concepts and applications to reduce the size of the antenna without obstructing the performance of the antennas. This paper proposes a novel compact octagonal shaped broadband fractal antenna. The proposed antenna was designed on an inexpensive FR4-epoxy substrate and simulated using the High Frequency Structure Simulator. The antenna resonates in dual bands in 3.8 and 1GHz with lowest return loss of ?32.80dB and gain of 10.22dB while maintaining the VSWR in the 2:1 level. Attempts have been made to reduce the size and improve the bandwidth using fractal concept and truncation of ground plane. The fabricated antenna was verified experimentally and the results are agreeing with the simulations. The point of attraction of this antenna is the use of single patch for broadband coverage with easy fabrication. 2018, Springer Science+Business Media, LLC, part of Springer Nature.
Vivek R.; Yamuna G.; Suganthi S.; Kosta Y.P.; Jivani M.N.
Wireless Personal Communications, Vol-103, No. 2, pp. 1325-1340.
https://doi.org/10.1007/s11277-018-5511-1 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85045149863&doi=10.1007%2fs11277-018-5511-1&partnerID=40&md5=e1a142fab6c9014aeb1c70d88bba72be
Vivek R., Annamalai University, Chidambaram, India; Yamuna G., Annamalai University, Chidambaram, India; Suganthi S., Christ University, Bengaluru, India; Kosta Y.P., Marwadi University, Rajkot, India; Jivani M.N., Saurastra University, Rajkot, India
Template-based classification of SDSS-GALEX point sources
photometric classification; point-sources; QSOs; SDSS-GALEX; SED fitting; UV-optical photometry
We have classified a sample of 37,492 objects from SDSS into QSOs, galaxies and stars using photometric data over five wave bands (u, g, r, i and z) and UV GALEX data over two wave bands (near-UV and far-UV) based on a template fitting method. The advantage of this method of classification is that it does not require any spectroscopic data and hence the objects for which spectroscopic data is not available can also be studied using this technique. In this study, we have found that our method is consistent by spectroscopic methods given that their UV information is available. Our study shows that the UV colours are especially important for separating quasars and stars, as well as spiral and starburst galaxies. Thus it is evident that the UV bands play a crucial role in the classification and characterization of astronomical objects that emit over a wide range of wavelengths, but especially for those that are bright at UV. We have achieved the efficiency of 89% for the QSOs, 63% for the galaxies and 84% for the stars. This classification is also found to be in agreement with the emission line diagnostic diagrams. 2018, Indian Academy of Sciences.
Anjum A.; Das M.; Murthy J.; Gudennavar S.B.; Gopal R.; Bubbly S.G.
Journal of Astrophysics and Astronomy, Vol-39, No. 5
https://doi.org/10.1007/s12036-018-9552-3 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053881028&doi=10.1007%2fs12036-018-9552-3&partnerID=40&md5=b4ede5abebb6aeb4486002b94e059d3f
Anjum A., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560 029, India; Das M., Indian Institute of Astrophysics, II Block, Kormamangala, Bengaluru, 560 034, India; Murthy J., Indian Institute of Astrophysics, II Block, Kormamangala, Bengaluru, 560 034, India; Gudennavar S.B., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560 029, India; Gopal R., Department of Physics, CMR Institute of Technology, Bengaluru, 560 037, India; Bubbly S.G., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560 029, India
A study on optimal portfolio construction with special reference to NSE CNX Nifty pharma index
Pharma index; Portfolio constructions; Portfolio performance; Sharpe single index
Portfolio is a process of blending together the broad asset classes so as to obtain optimum return with minimum risk is called portfolio construction. In order to reduce the risk, investors need to diversify, spread their portfolio across a broad mix of assets. Diversifying the portfolio can help smooth out market ups and downs and returns from better performing assets help to offset those that arent performing so well. The present study has empirically examined the portfolio construction with special reference to NSE CNX Nifty Pharma Index. The study applied the Sharpe Single Index model to generate an efficient combination of securities from sample Pharma companies and has come up with a subsequent pattern. The study found that out the sample Pharma companies, Aurobindo Pharma Ltd attracted high risk while Glenmark Pharmaceuticals Ltd experienced the least risk, on the basis of return earned by the companies in the Pharma Index; Aurobindo Pharma Ltd has high return while Lupin Ltd has lowest return. Experimental results have demonstrated the feasible of the investment strategy, portfolio idea and electiveness of the combination assets on the investment strategy. IAEME Publication.
Raja M.; Venkatamuni Reddy R.; Muthu Gopalakrishnan M.; Patil A.
International Journal of Civil Engineering and Technology, Vol-9, No. 13, pp. 1355-1363.
Raja M., P.G and Research Department of Commerce, Bharathidasan University Constituent College, Tiruchirappalli, India; Venkatamuni Reddy R., Department of Commerce, MIT Campus, Manipal Academy of Higher Education, Manipal, India; Muthu Gopalakrishnan M., School of Business Studies and Social Sciences, CHRIST (Deemed to be University), BGR Campus, Bangalore, India; Patil A., School of Business Studies and Social Sciences, CHRIST (Deemed to be University), BGR Campus, Bangalore, India
Transformation of hydrocarbon soot to graphenic carbon nanostructures
Camphor; Graphenic carbon; Hydrocarbon soot; Kerosene; Liquid paraffin
Graphenic carbon nanostructures were synthesized from different precursors of petroleum and agricultural origin by oxidative scissoring. In the present study soot, an environmental pollutant is converted to a value-added product by facile synthesis techniques. The physicochemical changes of the nanostructures are investigated by means of XRD, AFM, FTIR, Raman spectroscopy, XPS analyses SEM-EDS and TEM analysis. XRD analysis confirms the formation of few layer oxidized carbon nanostructures with smaller lateral dimensions. Raman spectra reveal the existence of graphenic layer with a fewer defect. AFM and SEM analyses reveal the formation of stacked tiny fragments of graphenic carbon lamellae. XPS and IR analyses confirm the incorporation of oxygen functionalities into the carbon backbone. 2018 by the authors.
Biointerface Research in Applied Chemistry, Vol-8, No. 3, pp. 3187-3192.
Krishnan R., Materials Research Laboratory, Department of Physics and electronics, Christ University, Bengaluru, Karnataka, India; Balachandran M., Materials Research Laboratory, Department of Physics and electronics, Christ University, Bengaluru, Karnataka, India
What is beautiful is good: An evalutation of effectiveness of attractiveness in celebrity endorsements
Advertising; Attitude towards brand; Celebrity endorsement; Purchase intention
The studies in the field of marketing have shown that characteristics of the source will influence persuasiveness of an advertisement. Attractiveness is one such celebrity characteristic that is widely studied by researchers in the field of marketing. However, still, literature failed to explain how attractiveness of celebrity endorsers influenced purchase intentions. This study tried to fill this gap by modelling the influence of celebrity attractiveness on purchase intention. It also evaluated the effect of respondents' gender on the model. The data collection for the study were carried out during March - June 2017. The study found that the effect of celebrity attractiveness on purchase intention was mediated by celebrity brand fit, attitude towards the advertisement, and attitude towards the brand. The study also evaluated the moderating effect of respondents' gender using chi- square analysis, which found no significant model difference among male and female respondents. These findings indicated that celebrity attractiveness created purchase intention in a mediated manner among the respondents, irrespective of their gender. 2018, Associated Management Consultants Private Limited.
Indian Journal of Marketing, Vol-48, No. 8, pp. 24-36.
Associated Management Consultants Pvt. Ltd.
https://doi.org/10.17010/ijom/2018/v48/i8/130538 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052444688&doi=10.17010%2fijom%2f2018%2fv48%2fi8%2f130538&partnerID=40&md5=26562dc09766c5f3dcb24eff1b617e13
Johnson J., School of Management and Business Studies, Mahatma Gandhi University, Priyadarsini Hills P.O., Kottayam, Kerala, 686 560, India; Thomas T., Department of Management Studies, Christ (Deemed to be University), Bangalore, Karnataka, 560 029, India
Mining the web data for classifying and predicting users' requests
Classification; Customer; E-commerce; Prediction; Product Recommendation; Segmentation; Trend
Consumers are the most important asset of any organization. The commercial activity of an organization booms with the presence of a loyal customer who is visibly content with the product and services being offered. In a dynamic market, understanding variations in client?s behavior can help executives establish operative promotional campaigns. A good number of new consumers are frequently picked up by traders during promotions. Though, several of these engrossed consumers are one-time deal seekers, the promotions undeniably leave a positive impact on sales. It is crucial for traders to identify who can be converted to loyal consumer and then have them patronize products and services to reduce the promotion cost and increase the return on investments. This study integrates a classifier that allows prediction of the type of purchase that a customer would make, as well as the number of visits that he/she would make during a year. The proposed model also creates outlines of users and brands or items used by them. These outlines may not be useful only for this particular prediction task, but could also be used for other important tasks in e-commerce, such as client segmentation, product recommendation and client base growth for brands. Copyright 2018 Institute of Advanced Engineering and Science. All rights reserved.
Girish S.; Ramamurthy B.; Senthilnathan T.
International Journal of Electrical and Computer Engineering, Vol-8, No. 4, pp. 2390-2398.
Institute of Advanced Engineering and Science
All Open Access; Green Open Access; Hybrid Gold Open Access
https://doi.org/10.11591/ijece.v8i4.pp2390-2398 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049571427&doi=10.11591%2fijece.v8i4.pp2390-2398&partnerID=40&md5=1a91b08884f0e6b1ef3f2be356ef3aab
Girish S., Department of Computer Science, Christ University, Hosur Road, Bengaluru, Karnataka, India; Ramamurthy B., Department of Computer Science, Christ University, Hosur Road, Bengaluru, Karnataka, India; Senthilnathan T., Department of Computer Science, Christ University, Hosur Road, Bengaluru, Karnataka, India
Parental Involvement in School Counseling Services: Challenges and Experience of Counselor
Parents; School counseling; School counselor experience
School counselors include parents as informants in school counseling for various reasons like for consultation and clients intervention which could lead to a different experience. The objective of the present study was to explore the challenges faced by school counselors when involving parents in the school counseling process and the ways they handle the challenges. The participants consisted of seven school counselors, with whom in-depth interviews were conducted. The subjective experiences of the school counselors were objectively interpreted by the researcher using interpretative phenomenological analysis. The research results were categorized into master and subordinate themes using double hermeneutics. The results revealed that although school counselors have their own individual perceptions of challenges and methods of handling parental inclusion in the school counseling context, there still exist similarities in their methods of handling. The study highlights school counselors beliefs about parents perceptions and expectations of counseling as well as parents reaction toward their childs problem as a challenge. The findings throw light on the need for stronger evidence-based practices and policies for school counseling programs. Training and competence-building programs for school counselors would improve the service delivery. 2018, National Academy of Psychology (NAOP) India.
Psychological Studies, Vol-63, No. 4, pp. 359-364.
Vaishnavi J., Department of Psychology, Christ University, Bengaluru, India; Kumar A., Department of Psychology, Christ University, Bengaluru, India
Synthesis and Characterization of Cyclopentadithiophene and Thienothiophene-Based Polymers for Organic Thin-Film Transistors and Solar Cells
donor-donor type conjugated polymers; organic solar cells; organic thin film transistors
Novel donor-donor type alternating copolymers (8CDT-TT and 16CDT-TT) derived from cyclopentadithiophene (CDT) and thienothiophene (TT) moieties that differ from solubilizing side chains were successfully synthesized and characterized. After the synthesis of CDT-TT-based conjugated polymers with dioctyl and dihexadecyl side chains, their optical, thermal, structural and semiconducting properties were investigated. Organic thin-film transistors fabricated from 8CDT-TT and 16CDT-TT exhibit carrier mobilities as high as 3.920-4 and 1.050-3 cm2V-1s-1, respectively. Bulk heterojunction solar cells fabricated using a polymer:PCBM blend ratio of 1:3 exhibit power conversion efficiencies of 2.12 and 1.84% for 8CDT-TT and 16CDT-TT, respectively. 2018, The Polymer Society of Korea and Springer Nature B.V.
Madathil P.K.; Cho S.; Choi S.; Kim T.-D.; Lee K.-S.
Macromolecular Research, Vol-26, No. 10, pp. 934-941.
Madathil P.K., Department of Advanced Materials, Hannam University, Daejeon, 34054, South Korea, Department of Chemistry, Christ University, Bangalore, 560029, India; Cho S., Department of Physics and EHSRC, University of Ulsan, Ulsan, 44610, South Korea; Choi S., Department of Advanced Materials, Hannam University, Daejeon, 34054, South Korea; Kim T.-D., Department of Advanced Materials, Hannam University, Daejeon, 34054, South Korea; Lee K.-S., Department of Advanced Materials, Hannam University, Daejeon, 34054, South Korea
Numerical study of thermal performance in a circular pipe using angle plate inserts directed in horizontal and vertical directions
Angle plate inserts; Backward/forward arrangements; Friction factor; Nusselt number; Thermo-hydraulic performance
A novel type of angle plate inserts (APIs) was designed to improve the convection heat transfer in a circular pipe. In the present work characteristics of heat transfer, flow resistance, and overall thermo-hydraulic performance of turbulent airflow in a circular tube fitted with APIs were investigated at the Reynolds numbers range of 6000-18000 through numerical simulation. Our main attention was paid to the effects of the APIs with forward or backward arrangements, and the angle plates with various inclined angles (? = 30, 45 and 60) inserted in the circular tube for a constant pitch of 0.03 m. The results show that the Nusselt number is augmented by 2.39-4.63 times (Nu = 124.25-239.76) as that of the smooth tube. The value of performance index (PI) lies in the range of 1.34-1.63, which demonstrates that the angle plate insert has a very good overall thermo-hydraulic performance. The numerical results obtained were compared with those from plain tubes of published data and empirical relations. The maximum increases in Nusselt number for the inclined forward angle plate insert were 1.34 to 1.5 times and, while those for the backward angle plate insert were 1.46 to 1.63 over the plain tube, respectively. The friction factor ( f ) resulted in an increase of 4.28-23.12 times in case of forward arrangement and 8.09-31.76 times in case of backward arrangement. In addition, the use of the angle plate insert strip with backward arrangement leads to better overall enhancement ratio than that with forwarding arrangement around 8% to 9%. 2018 Pushpa Publishing House, Allahabad, India.
Thejaraju R.; Bedi R.; Joseph S.P.; Paul E.
JP Journal of Heat and Mass Transfer, Vol-15, No. 4, pp. 791-811.
https://doi.org/10.17654/HM015040791 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063280200&doi=10.17654%2fHM015040791&partnerID=40&md5=7feea9a1ff3b2be1fb8476ea835299f8
Thejaraju R., Department of Mechanical and Automobile Engineering, Faculty of Engineering, Christ University, Kumbalgodu P.O., Mysore Road, Bengaluru, 560 074, Karnataka, India; Bedi R., Department of Mechanical and Automobile Engineering, Faculty of Engineering, Christ University, Kumbalgodu P.O., Mysore Road, Bengaluru, 560 074, Karnataka, India; Joseph S.P., Department of Mechanical and Automobile Engineering, Faculty of Engineering, Christ University, Kumbalgodu P.O., Mysore Road, Bengaluru, 560 074, Karnataka, India; Paul E., Department of Mechanical and Automobile Engineering, Faculty of Engineering, Christ University, Kumbalgodu P.O., Mysore Road, Bengaluru, 560 074, Karnataka, India
Evaluation of cytotoxicity and antioxidant properties of some Zingiberaceae plants
2,3,5-triphenyltetrazolium chloride; Cytotoxicity; Reactive oxygen species; Zingiberaceae
Aim: Zingiberaceae family is widely distributed in the tropical realm of Asia. Considering its diverse applications as spices and therapeutics, the present study was undertaken to evaluate the cytotoxic and antioxidant effect of the ethanolic rhizome extracts of five plants, namely Alpinia galanga (L.) Willd., Alpinia zerumbet (Pers.) B.L. Burtt and R. M. Smith, Curcuma caesia Roxb., Zingiber officinale Rosc., and Zingiber zerumbet (L.) Smith on Allium cepa Linn. system. Materials and Methods: Cytotoxicity was evaluated by 2,3,5-triphenyltetrazolium chloride (TTC) and 2',7'-dichlorofluorescein diacetate (DCFDAH 2 ) assays. Further, in vitro DNA protection assay was performed to confirm the antioxidant potentials of the extracts. Characterization of phytochemicals was done by performing qualitative tests. Results and Discussion: TTC reduction assay revealed that the extracts (2.5, 5, and 10 g/ml) had no cytotoxic effect on A. cepa root cells. Roots treated with extracts (2.5 g/ml) were stained with reactive oxygen species-sensitive dye DCFDAH 2 and visualized under the fluorescence microscope. The result confirmed that the extracts did not exert any prooxidant effect. Further, the extracts established their substantial antioxidant potential by inhibiting oxidative DNA damage in an in vitro system. In addition, qualitative analysis showed that the rhizomes are rich in phytochemicals. Conclusion: From the current observations, it can be concluded that the selected herbs can be utilized safely for human consumption. 2019 BRNSS Publication Hub. All Rights Reserved.
Nag A.; Chakraborty M.; Banerjee R.; Mukherjee A.
International Journal of Green Pharmacy, Vol-12, No. 4, pp. S870-S875.
https://doi.org/10.22377/ijgp.v12i04.2268 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063179009&doi=10.22377%2fijgp.v12i04.2268&partnerID=40&md5=160786d16739dc3b072196eee7dde1d6
Nag A., Department of Life Sciences, CHRIST (Deemed to be University), Bengaluru, Karnataka, 560 029, India; Chakraborty M., Department of Botany, Cell Biology and Genetic Toxicology Laboratory, University of Calcutta, Kolkata, West Bengal, India; Banerjee R., Department of Botany, Cell Biology and Genetic Toxicology Laboratory, University of Calcutta, Kolkata, West Bengal, India; Mukherjee A., Department of Botany, Cell Biology and Genetic Toxicology Laboratory, University of Calcutta, Kolkata, West Bengal, India
The hope and the dilemma of the urban poor
A common view about economically weaker sections and lower-income groups in India is that they live in slums because they cannot afford to buy or rent decent accommodation in the formal market. However, some can pay a monthly rent and/or for the services such as garbage disposal and water, but they, and others who can afford to buy, are deterred by institutional constraints. Many slum households face a dilemma: opting for better and more secure living conditions would mean losing some of the advantages of living in a slum and the possibility of a free home. 2018 Economic and Political Weekly. All rights reserved.
Economic and Political Weekly, Vol-53, No. 40, pp. 40-47.
Ram P., Christ University, Bengaluru, India; Needham B., Radboud University, Nijmegen, Netherlands
Tailoring of low grade coal to fluorescent nanocarbon structures and their potential as a glucose sensor
Lignite is an abundantly utilized feedstock for the facile synthesis of fluorescent carbon dots and carbon nanomaterials. Its value is appreciated as an energy source for combustion for long time. Herein we report a novel top-down strategy to synthesis lignite based fluorescent nano carbon structures by combined acidic oxidation and chemical reflux. The nanocarbon crystallites in lignite are converted to oxygenated nano carbon dots and graphene sheets. They exhibited stable fluorescence property in the visible region depending on their size, functionalities and defects which were highly stable in all the pH conditions. These nanocarbon structures are an effective probe for fluorescent sensing of label-free and selective detection of glucose ions with detection limit as low as 0.125 mM, promising real-world sensor applications. These findings establish a scalable method for the production of fluorescent carbon based glucose sensor from lignite. 2018, The Author(s).
All Open Access; Gold Open Access; Green Open Access
Manoj B., Department of Physics & Electronics, CHRIST (Deemed to be University) Bengaluru, Karnataka, 560029, India; Raj A.M., Department of Physics & Electronics, CHRIST (Deemed to be University) Bengaluru, Karnataka, 560029, India; Thomas G.C., Department of Physics & Electronics, CHRIST (Deemed to be University) Bengaluru, Karnataka, 560029, India