Studies on Parametric Optimization of HVOF-Sprayed Cr2O3 Coatings on Al6061 Alloy
Adhesion; Chromium oxide coating; Microhardness; Porosity; Taguchi method
High-velocity oxy-fuel (HVOF) is a widely used thermal spray technique to obtain high density, high bond strength, and improved hardness coatings. In the present work, optimization of HVOF process parameters was carried out using the Taguchi method to minimize porosity and improve microhardness, and bond strength of Cr2O3 coatings. Based on the signal-to-noise ratio and analysis of variance, the significance of each process parameter and optimum parameter combination is obtained. Based on the signal-to-noise ratio, the most significant process parameter affecting porosity and microhardness was standoff distance, while for bond strength, it was powder feed rate. An optimal combination of process parameters for porosity, microhardness, and bond strength was obtained from S/N ratio analysis. For porosity, optimal parameters were standoff distance of 100rpm, powder feed rate of 30g/min, and gun speed of 250mm/s. The optimal process parameters for microhardness were standoff distance of 300rpm, powder feed rate of 50g/min, and gun speed of 200mm/s. Finally, for bond strength, the optimal process parameters were standoff distance of 300rpm, powder feed rate of 50g/min, and gun speed of 250mm/s. Statistical results for porosity, microhardness, and bond strength showed that the difference between the predicted R2 and adjusted R2 values were relatively minimal and close to the one highlighting the fitness of the regression model employed for analysis. Fracture analysis after bond strength test showed combined adhesion/cohesion type failure for the Cr2O3 coatings. 2021, The Indian Institute of Metals - IIM.
Pradeep Kumar G.S.; Harish Kumar M.; Thomas S.; Yegnesh H.M.; Bharadwaj S.; Hebbar G.S.
Transactions of the Indian Institute of Metals, Vol-74, No. 8, pp. 2013-2025.
Pradeep Kumar G.S., Department of Mechanical and Automobile Engineering, CHRIST (Deemed To Be University), Bangalore, 560074, India; Harish Kumar M., Department of Mechanical and Automobile Engineering, CHRIST (Deemed To Be University), Bangalore, 560074, India; Thomas S., Department of Mechanical and Automobile Engineering, CHRIST (Deemed To Be University), Bangalore, 560074, India; Yegnesh H.M., Department of Mechanical and Automobile Engineering, CHRIST (Deemed To Be University), Bangalore, 560074, India; Bharadwaj S., Department of Mechanical and Automobile Engineering, CHRIST (Deemed To Be University), Bangalore, 560074, India; Hebbar G.S., Department of Mechanical and Automobile Engineering, CHRIST (Deemed To Be University), Bangalore, 560074, India
Heat transport of hybrid nanomaterial in an annulus with quadratic Boussinesq approximation
annulus; hybrid nanoliquid; non-uniform heat source/sink; O368; quadratic Boussinesq approximation; response surface methodology (RSM); sensitivity analysis
The convective heat transfer of hybrid nanoliquids within a concentric annulus has wide engineering applications such as chemical industries, solar collectors, gas turbines, heat exchangers, nuclear reactors, and electronic component cooling due to their high heat transport rate. Hence, in this study, the characteristics of the heat transport mechanism in an annulus filled with the Ag-MgO/H2O hybrid nanoliquid under the influence of quadratic thermal radiation and quadratic convection are analyzed. The non-uniform heat source/sink and induced magnetic field mechanisms are used to govern the basic equations concerning the transport of the composite nanoliquid. The dependency of the Nusselt number on the effective parameters (thermal radiation, nonlinear convection, and temperature-dependent heat source/sink parameter) is examined through sensitivity analyses based on the response surface methodology (RSM) and the face-centered central composite design (CCD). The heat transport of the composite nanoliquid for the space-related heat source/sink is observed to be higher than that for the temperature-related heat source/sink. The mechanisms of quadratic convection and quadratic thermal radiation are favorable for the momentum of the nanoliquid. The heat transport rate is more sensitive towards quadratic thermal radiation. 2021, Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature.
Applied Mathematics and Mechanics (English Edition), Vol-42, No. 6, pp. 885-900.
Springer Science and Business Media B.V.
Thriveni K., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India
Significance of inclined magnetic field on nano-bioconvection with nonlinear thermal radiation and exponential space based heat source: a sensitivity analysis
The characteristics of heat transport in nanoliquids under the influence of bio-convection (motile microorganism) have significant applications, since nanoliquids have greater capacity to improve heat transport properties than conventional liquids. With these incredible nanoliquid characteristics, the main objective of current research is to examine the impact of the exponential heat source linked to space and the inclined magnetic force on the nano-bioconvective flow between two turntables. The effect of nonlinear thermal radiation, variable thermal conductivity and viscosity aspects are also considered. The complicated nonlinear problem is treated numerically by using Finite difference method. Optimization procedure implemented via Response surface Methodology for the effective parameters thermophoresis parameter, Hartmann number and radiation parameter on the heat transfer rate. The axial velocity is a dwelling function of the inclined angle of the magnetic field, and the variable viscosity parameter. The temperature profile hikes with an exponential space-related heat source and thermal radiation aspects. Also, the heat transport rate is highly sensitive towards nonlinear thermal radiation parameter compared to the thermophoresis effect and Hartmann number. 2021, The Author(s), under exclusive licence to EDP Sciences, SocietItaliana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.
European Physical Journal: Special Topics, Vol-230, No. 5, pp. 1487-1501.
Springer Science and Business Media Deutschland GmbH
https://doi.org/10.1140/epjs/s11734-021-00045-9 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104078327&doi=10.1140%2fepjs%2fs11734-021-00045-9&partnerID=40&md5=e891c24ffc5bf2b73bfc8d828a8302ab
Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India; Thriveni K., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India
Influence of hydrothermal synthesis conditions on lattice defects in cerium oxide
Ceria synthesis; Hydrothermal conditions; Oxidation activity; Redox character
Cerium oxide makes one of the most promising materials for chemical transformations in environmental and energy applications. Herein, the influence of hydrothermal conditions on the physico-chemical characteristics of cerium oxide prepared from salt solution via ammonia precipitation is analyzed. The systems are well characterized using SEM, TEM, XRD analysis, photoluminescence spectra, Raman spectra, TPR study. and XPS analysis. Normal aqueous conditions lead to particles of size ~8 ?nm, with truncated octahedral geometry, closer to spheroid shape (RT-Ce) bound by {111} and {100} planes. Elevated temperature facilitated preferential exposed {100} plane bounded cubic ceria structures of size ~15 ?nm (HT-Ce), which are stabilized by more number of anion vacancies. Low temperature synthesis yielded smaller sized particles with less crystallinity and higher surface area, when compared to hydrothermal route. Lattice defects, represented in terms of Ce3+ ions and associated lattice oxygen vacancies are seen in higher amounts in ceria synthesised via hydrothermal path, as supported by various characterization results. CeO2 achieved via hydrothermal path exhibited higher catalytic oxidation activity, which is examined using a model oxidation reaction, vis., CO oxidation. The enhanced activity of HT-Ce is explained through the defect structure induced facile redox shift in the system. 2021 Elsevier Inc.
Divya T.; Anjali C.; Sunajadevi K.R.; Anas K.; Renuka N.K.
Journal of Solid State Chemistry, Vol-300
https://doi.org/10.1016/j.jssc.2021.122253 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105557078&doi=10.1016%2fj.jssc.2021.122253&partnerID=40&md5=b4d4ee8449da9d00833ee11d5d912d2e
Divya T., Department of Chemistry, University of Calicut, 673635, Kerala, India; Anjali C., Department of Chemistry, University of Calicut, 673635, Kerala, India; Sunajadevi K.R., Department of Chemistry, CHRIST (Deemed to Be University), 560029, Karnataka, India; Anas K., R&D Division, Sud-Chemie India Pvt. Limited, Binanipuram, 683502, Kerala, India; Renuka N.K., Department of Chemistry, University of Calicut, 673635, Kerala, India
Effects of Variable Viscosity and Internal Heat Generation on RayleighBard Convection in Newtonian Dielectric Liquid
Electric field dependent variable viscosity; Electric Rayleigh number; Internal heat generation; Smart liquids; Temperature dependent variable viscosity
The onset of RayleighBard convection of variable-viscosity Newtonian dielectric liquid confined between two parallel plates is subject to free-free isothermal boundary condition. The combined and individual effects of temperature-dependent and electric-field-dependent variable-viscosity along with the internal heat generation are studied using the higher order Galerkin technique. This theoretical study shows that even a mild temperature-dependent variable-viscosity destabilizes the system and the electric-field-dependent variable-viscosity stabilizes the system both in the absence/presence of heat source/sink. 2021, The Author(s), under exclusive licence to Springer Nature India Private Limited.
International Journal of Applied and Computational Mathematics, Vol-7, No. 3
Shivaraj B., Department of Mathematics, Dayananda Sagar Academy of Technology and Management, Bengaluru, 560082, Karnataka, India; Siddheshwar P.G., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, Karnataka, India; Uma D., Department of Computer Science and Engineering, PES University, Bengaluru, 560085, Karnataka, India
Molecularly Imprinted Scaffold Based on poly (3-aminobenzoic acid) for Electrochemical Sensing of Vitamin B6
Inadequate or excess consumption of Vitamin B6 (Vit B6) can have ill effects on the overall well-being of humans, thereby making it necessary to control their content and composition in the food we consume. A simple sensor is fabricated in this work for Vit B6 detection based on employing an electropolymerized molecularly imprinted polymer (MIP) of 3-amino benzoic acid. The poly (3- aminobenzoic acid) (P-(3ABA)) film was electrodeposited by potentiodynamic cycling of potential with and without Vit B6 (template) on carbon fiber paper electrode (CFP). The modified working electrodes were characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Field emission scanning microscopy, Energy dispersive X-ray spectrometry, Fourier Transform Infrared spectroscopy, Optical profilometry and X-ray photon electron spectroscopy were used for characterization. Nyquist plots revealed least charge transfer resistance at MIP/CFP than other control electrodes due to the molecularly imprinted sites. Under the optimized experimental conditions the developed MIP sensor showed a linear range 0.6 ?M to 700 ?M, with a detection limit of 0.010 ?M. Also a value of the imprinting factor (? = 3.50) indicates very good selectivity of the prepared sensor towards Vit B6 detection over its structurally similar analogues in the analysis of real sample matrices. 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
Cherian A.R.; Benny L.; Varghese A.; John N.S.; Hegde G.
Journal of the Electrochemical Society, Vol-168, No. 7
Cherian A.R., Department of Chemistry, CHRIST (Deemed to Be University), Bengaluru, 560029, India; Benny L., Department of Chemistry, CHRIST (Deemed to Be University), Bengaluru, 560029, India; Varghese A., Department of Chemistry, CHRIST (Deemed to Be University), Bengaluru, 560029, India; John N.S., Centre for Nano and Soft Matter Sciences, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India; Hegde G., Centre for Nano-materials and Displays, B.M.S. College of Engineering, Bengaluru, 560019, India
Transition metal oxides in electrochemical and bio sensing: A state-of-art review
Detection limit; Electrochemical sensing; Graphene oxide; Linear range; Selectivity; Transition metal oxide nanoparticles
This review article portrays the progress in developing novel electrochemical sensors using morphologically varied transition metal oxides. The role and applications of transition metal oxide nanoparticles of iron, titanium, manganese, zirconium, cobalt, nickel and their composites in the field of electrochemical and bio sensing are conferred in detail. Appropriate chemical functionalization of these nanomaterials guarantees the selective and sensitive determination of target molecules including DNA or creating antigen/antibody complexes. Substantial data is summed up in the tables. This review article highlights the significance of transition metal oxide nanoparticles as promising electrode modifiers for fabrication of sensors. The review ends up with a relevant discussion, existing challenges and future scopes. 2021 The Author(s)
https://doi.org/10.1016/j.apsadv.2021.100072 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111864384&doi=10.1016%2fj.apsadv.2021.100072&partnerID=40&md5=ec18fcc4a3b99a17297f9598fc795c34
Agnihotri A.S., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560 029, India; Varghese A., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560 029, India; M N., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560 029, India
Tamarindusindica Mediated Combustion Synthesis of BiOCl: Photocatalytic Degradation of Dyes and Synthesis of ?-Enaminones
BiOCl flakes; combustion; photocatalytic degradation; ?-enaminones
Environmental pollution due to dyes has been increasing continuously due to the large number of textile industries, which affects living systems. Photocatalytic degradation (PCD) is one of the most efficient methods to expel organic dyes in wastewater. In this respect, synthesizing photocatalytic nanoparticles to degrade organic dyes by a simple and cost-effective method is the real challenge. In this article, a carcinogenic dye, methylene blue, is considered for our study as it releases highly toxic species into the ecosystem and causes severe health problems such as cancer, skin and kidney problems, etc. Bismuth oxychloride has been synthesized by simple, low cost and rapid combustion method using low cost, easily available Tamarindusindica as a fuel at 500 C for ~10 min. The obtained BiOCl has been characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), UV-Vis spectroscopy, photoluminescence spectroscopy and surface area by BrunauerEmmettTeller (BET). The XRD pattern shows a tetragonal phase and the FT-IR spectrum shows the presence of Bi-Cl at 1109 cm?1. SEM shows a flake-like morphology and HR-TEM displays d-spacing values of 0.13 nm. Photoluminescence studies show a green emission peak at 530 nm. Synthesis of ?-enaminones was also examined using analogues of aniline and dimedone in presence of BiOCl as a photocatalyst. 2021, The Minerals, Metals & Materials Society.
Shashikanth J.; Shashank M.; Sumedha H.N.; Alharthi F.A.; Nizam A.; Reddy M.; Nagaraju G.
Journal of Electronic Materials, Vol-50, No. 8, pp. 4650-4662.
Shashikanth J., Department of Chemistry, Siddaganga Institute of Technology (Affiliated to VTU, Belagavi), Tumakuru, 572103, Karnataka, India, School of Chemical Sciences, REVA University, Bengaluru, 560064, Karnataka, India; Shashank M., Department of Chemistry, Siddaganga Institute of Technology (Affiliated to VTU, Belagavi), Tumakuru, 572103, Karnataka, India, Department of Studies and Research in Industrial Chemistry, School of Chemical Science, Kuvempu University, Shankaraghatta, 577451, Karnataka, India; Sumedha H.N., Department of Chemistry, Siddaganga Institute of Technology (Affiliated to VTU, Belagavi), Tumakuru, 572103, Karnataka, India; Alharthi F.A., Department of Chemistry, College of Science, King Saud University, P.O. 2455, Riyadh, 11451, Saudi Arabia; Nizam A., Department of Chemistry, Christ University, Hosur Road, Bengaluru, 560029, India; Reddy M., School of Chemical Sciences, REVA University, Bengaluru, 560064, Karnataka, India; Nagaraju G., Department of Chemistry, Siddaganga Institute of Technology (Affiliated to VTU, Belagavi), Tumakuru, 572103, Karnataka, India
An analysis of the ethical challenges of blockchain-enabled E-healthcare applications in 6G networks
6G Network; Access; Accountability; Blockchain; E-healthcare; Ethical Challenges; Fairness; Governance; Privacy; Right to be Forgotten
Developments in blockchain technology coupled with rapid developments in network technologies have disrupted traditional business and service models. One such application is in the domain of healthcare. However, the domain's sensitive nature and complexity require blockchain-enabled e-healthcare to ensure utilitarianism while suitably addressing the associated ethical challenges. In this milieu, the paper attempts to identify and evaluate the parameters of ethical challenges associated with blockchain adoption in e-healthcare. This paper contributes to the extant body of knowledge by presenting a critical review of the ethical considerations at the meso level of blockchains in e-healthcare. Based on findings from the literature, the study identified nine parameters of blockchain ethics. Of these, Accuracy and Right to be Forgotten were found to be most critical in terms of ethical dilemmas in healthcare applications. No evidence of ethical dilemma could be found with respect to Accountability and Data Ownership. As these services are deployed over networks, all these challenges are further evaluated in the context of 6G network-based models. This will not only provide the stakeholders with a holistic view of the ethical challenges in various blockchain-enabled healthcare applications but also enable a meticulous transition to the 6G network. 2021
International Journal of Cognitive Computing in Engineering, Vol-2, pp. 171-179.
https://doi.org/10.1016/j.ijcce.2021.10.002 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124511361&doi=10.1016%2fj.ijcce.2021.10.002&partnerID=40&md5=8e0735d7e3ef1a070fbc5ce24c525f21
Srivastava V., School of Business and Management, Christ University, Bengaluru, India; Mahara T., School of Business and Management, Christ University, Bengaluru, India; Yadav P., MJP Rohilkhand University, Bareilly, India
Multilayer flow and heat transport of nanoliquids with nonlinear Boussinesq approximation and viscous heating using differential transform method
differential transform method; hybrid nanoliquid; multilayer flow; nanoparticles; nonlinear Boussinesq approximation; viscous dissipation
Multilayer fluid flow models are significant in various applications, namely, cooling electronic systems, solar thermal systems, and nuclear reactors. The density of a fluid fluctuates nonlinearly due to large temperature difference circumstances in thermal systems. Thus, the linear Boussinesq approximation is no longer relevant. Therefore, this article describes a multilayer flow of nanoliquids in the presence of nonlinear Boussinesq approximation. The hybrid nanoliquid layer is sandwiched between two nanoliquid layers. The single-phase khanafer-vafai-lightstone model is implemented to simulate the nanoliquids. The quadratic density temperature fluctuation and viscous heating are taken into account. The temperature and velocity across the interface are assumed to be continuous. The equations that govern the problem are solved analytically by using the differential transformation method. The results show that the presence of a hybrid nanoliquid layer affects the velocity and heat transfer properties of the nanofluid flow. Hybrid nanofluid can be used to achieve the desired multilayer flow properties of a nanofluid and its heat transfer properties. Further, the quadratic convection aspect increases the velocity distributions. 2021 Wiley Periodicals LLC
Heat Transfer, Vol-50, No. 5, pp. 4309-4327.
https://doi.org/10.1002/htj.22076 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099770880&doi=10.1002%2fhtj.22076&partnerID=40&md5=14731cc5933a3d1dfe0740fff7a85a0d
Rajeev A., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, India; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, India
Effect of Non-inertial Acceleration on BrinkmanBard Convection in Water-Copper Nanoliquid-Saturated Porous Enclosures
Enclosures; GinzburgLandau equation; Linear analysis; Lorenz model; Nanoparticles; Non-linear analysis; Realistic boundary condition
In the present paper we have considered rotating porous tall, square and shallow enclosures heated from below. Linear and non-linear analyses are made using a minimal representation by Fourier trigonometric series. The study is done for realistic boundary condition. Thermophysical properties of water-copper nanoliquid as a function of properties of water as base liquid, copper as nanoparticle and 30% glass fiber reinforced polycarbonate as porous medium are obtained from either phenomenological laws or mixture theory. Non-existence of oscillatory convection is discussed. The range for the existence of unicellular convection is mentioned. The effects of Brinkman number (?), porous parameter (?2), aspect ratio (A) and volume fraction (?) in the presence of rotation on the onset of convection and heat transfer are studied and illustrated graphically. The analytically intractable Lorenz model is derived and transformed into the tractable GinzburgLandau equation using the multiscales method. The definition of Ozoe heat transfer parameter is introduced to discuss the rate of heat transfer enhancement or reduction. It is observed that Ta, ? and ?2 have stabilizing effect on the system and thereby leading to diminished heat transfer whereas A and ? have destabilizing effect on the system and thereby leading to increased heat transfer. Among the three enclosures considered in the study enhanced heat transfer takes place in tall enclosure followed by square and shallow enclosures respectively. It is further observed that presence of nanoparticles advances the onset of convection and enhances the heat transfer. The results of the paper are compared with previous existing results in the absence of rotation and the good agreement is found between them. 2021, The Author(s), under exclusive licence to Springer Nature India Private Limited.
https://doi.org/10.1007/s40819-021-01045-y https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106892180&doi=10.1007%2fs40819-021-01045-y&partnerID=40&md5=2d7ae2dc125a8ff7e5bba591ea8b7019
Siddheshwar P.G., Department of Mathematics, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Veena B.N., Department of Mathematics, M. S. Ramaiah Institute of Technology, M S Ramaiah Nagar, MSRIT Post, Bengaluru, 560054, India
The COVID-19 vaccine preference for youngsters using promethee-ii in the ifss environment
COVID-19 vaccine; Extension of PROMETHEE-II; Intuitionistic fuzzy soft set; Preference structure
Extensive decision-making during the vaccine preparation period is unpredictable. An account of the severity of the disease, the younger people with COVID-19 comorbidities and other chronic diseases are also at a higher risk of the COVID-19 pandemic. In this research article, the preference ranking structure for the COVID-19 vaccine is recommended for young people who have been exposed to the effects of certain chronic diseases. Multiple Criteria Decision-Making (MCDM) approach effectively handles this vague information. Furthermore, with the support of the Intuitionistic Fuzzy Soft Set (IFSS), the entries under the new extension of the Preference Ranking Organization Method for Enrichment Evaluation-II (PROMETHEE-II) is suggested for Preference Ranking Structure. The concept of intuitionistic fuzzy soft sets is parametric in nature. IFSS suggests how to exploit an intuitionistic ambiguous input from a decision-maker to make up for any shortcomings in the information provided by the decider. The weight of the inputs is calculated under the Intuitionistic Fuzzy Weighted Average (IFWA) operator, the Simply Weighted Intuitionistic Fuzzy Average (SWIFA) operator, and the Simply Intuitionistic Fuzzy Average (SIFA) operator. An Extended PROMETHEE-based ranking, outranking approach is used, and the resultant are recommended under the lexicographic order. Its sustainability and feasibility are explored for three distinct priority structures and the possibilities of the approach. To demonstrate the all-encompassing intuitionistic fuzzy PROMETHEE approach, a practical application regarding COVID-19 severity in patients is given, and then it is compared to other existing approaches to further explain its feasibility, and the sensitivity of the preference structure is examined according to the criteria. 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Narayanamoorthy S.; Pragathi S.; Parthasarathy T.N.; Kalaiselvan S.; Kureethara J.V.; Saraswathy R.; Nithya P.; Kang D.
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.3390/sym13061030 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108342906&doi=10.3390%2fsym13061030&partnerID=40&md5=0ae0145b7f985bd0f915631b8fbadcab
Narayanamoorthy S., Department of Mathematics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India; Pragathi S., Department of Mathematics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India; Parthasarathy T.N., Department of Mathematics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India; Kalaiselvan S., Department of Social Work, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, SRMV, Coimbatore, Tamil Nadu, 641020, India; Kureethara J.V., CHRIST (Deemed to Be University), Bangalore, Karnataka, 560029, India; Saraswathy R., Karpagam Medical College and Hospital, Coimbatore, Tamil Nadu, 641032, India; Nithya P., Government Primary Health Center, Kallakurichi, Kalamaruthur, Tamil Nadu, 606202, India; Kang D., Department of Industrial and Management Engineering, Institute of Digital Anti-Aging Health Care, Inje University, 197 Inje-ro, Gimhae-si 50834, Gyeongsangnam-do, South Korea
Hybrid models for intraday stock price forecasting based on artificial neural networks and metaheuristic algorithms
Artificial bee colony algorithm; Artificial neural network; Genetic algorithm; Hit rate; Intraday stock prediction; Nature inspired algorithm; Stock market prediction
Stock market prediction is one of the critical issues in fiscal market. It is important issue for the traders and investors. Artificial Neural Networks (ANNs) associated with nature inspired algorithms are playing an increasingly vital role in many areas including medical field, security systems and stock market. Several prediction models have been developed by researchers to forecast stock market trend. However, few studies have focused on improving stock market prediction accuracy especially when utilizing artificial neural networks to perform the analysis. This paper proposed nine new integrated models for forecasting intraday stock price based on the potential of three ANNs, Back Propagation Neural Network (BPNN), Radial Basis Function Neural Network (RBFNN), Time Delay Neural Network (TDNN) and nature inspired algorithms such as Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Artificial Bee Colony (ABC).The developed models were named as GA-BPNN, PSO-BPNN, ABC-BPNN, GA-RBFNN, PSO-RBFNN, ABC-RBFNN, GA-TDNN, PSO-TDNN and ABC-TDNN. Nature inspired algorithms are employed for optimizing the parameters of ANNs. Technical indicators calculated from historical data are fed as input to developed models. Proposed hybrid models validated on four datasets representing different sectors in NSE. Four statistical metrics, Root Mean Square Error (RMSE), Hit Rate (HR), Error Rate (ER) and prediction accuracy were utilized to gauge the performance of the developed models. Results proved that the PSO-BPNN model yielded the highest prediction accuracy in estimating intraday stock price. The other models, GA-BPNN, ABC-BPNN, GA-RBFNN, PSO-RBFNN, ABC-RBFNN, GA-TDNN, PSO-TDNN and ABC-TDNN produced lower performance with mean prediction accuracy of 97.24%, 98.37%, 84.01%, 85.15%, 84.01%, 83.87%, 89.95% and 78.61% respectively. 2021
Pattern Recognition Letters, Vol-147, pp. 124-133.
https://doi.org/10.1016/j.patrec.2021.03.030 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105116690&doi=10.1016%2fj.patrec.2021.03.030&partnerID=40&md5=393862b59147e7a09b83488a2b5bfc53
S K.C., School of Business & Management, CHRIST (Deemed to be University), Bangalore, India
Study to assess attitudes towards statistics of business school students: An application of the SATS-36 in India
Attitude; Business education; Curriculum; Factor analysis; Post-test; Pre-test; SATS-36; Statistics education
Students attitudes towards Statistics are pivotal to their learning process as positive attitudes lead to highly satisfactory course achievement and lead to positive outcomes outside class as well. In this paper we are exploring the perception of students of management apropos Statistics, familiarity with which is imperative in todays world of Analytics. The quantitative approach was used to compare attitudes of the students using the two versions of the SATS-36 instrument validated and copyrighted by Candace Schau. A Google form was used to collect responses and was sent to all the students who were enrolled in the Business Statistics course. 172 students responded for the pre-test study while 71 students responded for the post-test study. Data was analysed to see if gender, specialisation choices and previous math experiences accounted for differences in perceptions towards Statistics. It was found that students overall perception of statistics is positive and surprisingly they were more positive towards the beginning of the semester. These results are important as they can lead towards understanding of business students attitudes towards statistics and a way to refine the teaching learning process so that students are in a strong position to exploit the supply demand gap in the Analytics domain and deliver value to organisations. 2021 Eskisehir Osmangazi University. All rights reserved.
International Journal of Instruction, Vol-14, No. 3, pp. 207-222.
Gate Association for Teaching and Education
https://doi.org/10.29333/iji.2021.14312a https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109635079&doi=10.29333%2fiji.2021.14312a&partnerID=40&md5=e23f0fbaec0afe1ee04237a62848a187
Sharma A.M., Department of Professional Studies, Christ University, Karnataka, Bengaluru, 560029, India; Srivastav A., Mumbai, India
Size Tuning, Phase Stabilization, and Anticancer Efficacy of Amorphous Selenium Nanoparticles: Effect of Ion-Pair Interaction, ?OH Functionalization, and Reuse of RTILs as Host Matrix
Se nanoparticles (NPs) of predominantly amorphous phase (?-Se) have been prepared in room-temperature ionic liquids (RTILs). The effects of ion-pair combination and ?OH functionalization of RTILs on the size and phase stability of Se NPs were investigated. The RTILs used were 1-ethyl-3-methyl imidazolium boron tetrafluoride ([EMIM][BF4]), 1-(2-hydroxyethyl)-3-methyl imidazolium boron tetrafluoride ([EOHMIM][BF4]), and 1-ethyl-3-methyl imidazolium methane sulfonate ([EMIM][MS]). The size of Se NPs@[EOHMIM][BF4] was found to be the smallest (?32 nm), followed by Se NPs@[EMIM][BF4] (?57 nm) and Se NPs@[EMIM][MS] (?60 nm), respectively. Interestingly, the stability studies revealed minimal size variations for Se NPs@[EMIM][MS], followed by Se NPs@[EOHMIM][BF4] and Se NPs@[EMIM][BF4], respectively. The observed trends could be correlated with the strength of interionic interactions in the respective RTILs, as well as their packing order (density). Importantly, the RTILs played the role of a solvent, a stabilizer, and an in situ source of reducing species. Pulse radiolysis study revealed imidazolium-originated radical species-driven formation of Se NPs. Further, anticancer efficacy studies demonstrated the role of NP size, wherein Se NPs@[EOHMIM][BF4] exhibited the highest cancer cell killing, followed by Se NPs@[EMIM][BF4] and Se NPs@[EMIM][MS]. Another significant highlight of this work is the reuse of the spent RTILs for the synthesis of the next batch of Se NPs. 2021 American Chemical Society
Guleria A.; Baby C.M.; Tomy A.; Maurya D.K.; Neogy S.; Debnath A.K.; Adhikari S.
Journal of Physical Chemistry C, Vol-125, No. 25, pp. 13933-13945.
https://doi.org/10.1021/acs.jpcc.1c02894 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85110419962&doi=10.1021%2facs.jpcc.1c02894&partnerID=40&md5=e1a3bf8e940c74c31eb99f65f8e8f498
Guleria A., Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Baby C.M., Christ University, Bengaluru, 560029, India; Tomy A., Christ University, Bengaluru, 560029, India; Maurya D.K., Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Neogy S., Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Debnath A.K., Technical Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Adhikari S., Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
Numerical simulation for coupled nonlinear Schringer-Korteweg-de Vries and Maccari systems of equations
coupled nonlinear Maccari system; Coupled nonlinear Schringer-Korteweg-de Vries system; Laplace transform; q -homotopy analysis method
The primary goal of this paper is to seek solutions to the coupled nonlinear partial differential equations (CNPDEs) by the use of q-homotopy analysis transform method (q-HATM). The CNPDEs considered are the coupled nonlinear Schringer-Korteweg-de Vries (CNLS-KdV) and the coupled nonlinear Maccari (CNLM) systems. As a basis for explaining the interactive wave propagation of electromagnetic waves in plasma physics, Langmuir waves and dust-acoustic waves, the CNLS-KdV model has emerged as a model for defining various types of wave phenomena in mathematical physics, and so forth. The CNLM model is a nonlinear system that explains the dynamics of isolated waves, restricted in a small part of space, in several fields like nonlinear optics, hydrodynamic and plasma physics. We construct the solutions (bright soliton) of these models through q-HATM and present the numerical simulation in form of plots and tables. The solutions obtained by the suggested approach are provided in a refined converging series. The outcomes confirm that the proposed solutions procedure is highly methodological, accurate and easy to study CNPDEs. 2021 World Scientific Publishing Company.
Modern Physics Letters B, Vol-35, No. 20
Akinyemi L., Department of Mathematics, Prairie View AandM University, Prairie View, United States; Veeresha P., Department of Mathematics, Christ Deemed to Be University, Bengaluru, 560029, India; Ajibola S.O., Department of Mathematics, University of Benin, Benin City, Nigeria
3-Sequent vertex coloring; 3-sequent vertex coloring number; 3s achromatic number; 3s achromatic sum
Three vertices x,y,z in a graph G are said to be 3-sequent if xy and yz are adjacent edges in G. A 3-sequent coloring (3s coloring) is a function ?: V (G) ?{1, 2,...,k} such that if x,y and z are 3-sequent vertices, then either ?(x) = ?(y) or ?(y) = ?(z) (or both). The 3-sequent achromatic number of a graph G, denoted ?3s(G), equals the maximum number of colors that can be used in a coloring of the vertices' of G such that if xy and yz are any two sequent edges in G, then either x or z is colored the same as y. The 3-sequent achromatic sum of a graph G, denoted a'3s(G), is the greatest sum of colors among all proper 3s-coloring that requires ?3s(G) colors. This research initiates the study of 3-sequent achromatic sum and finds the exact values of this parameter for some known graphs. Furthermore, we calculate the a'3s(G) of corona product, Cartesian product of the graphs and some important results have been proved and a comparative study is carried out. 2021 World Scientific Publishing Company.
Discrete Mathematics, Algorithms and Applications, Vol-13, No. 4
https://doi.org/10.1142/S1793830921500397 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097382406&doi=10.1142%2fS1793830921500397&partnerID=40&md5=4e61a2febc0c2d2d0348e833bc2d2ca0
Dominic C., Department of Mathematics, Christ (Deemed to Be University), Bangalore, Karnataka, 560029, India; Devassia J.V., Tecnologico de Monterrey, School of Engineering and Sciences, Mexico, Mexico
A new combinational technique in image steganography
Bi-Orthogonal Wavelet Transform; MSE; Particle Swarm Optimization; PSNR; Steganography
Internet is used for exchanging information. Sometimes it is needed to transmit confidential data via internet. Here the authors use image steganography to pass confidential data within a cover image. To construct the algorithm, they take the combinational help of particle swarm optimization (PSO), bi-orthogonal wavelet transform (BWT), and genetic algorithm (GA). They use PSO to take the enhanced version of cover image. They use BWT to choose the selective sub bands of cover image and we utilize GA to select a particular stego image among a set of stego images. Thus, an innovative technique of image steganography has been made to transmit confidential data via cover image generating stego image. This combinational approach of image steganography is quite safe for confidential data transmission and makes it hard for the attackers to retrieve the confidential data. 2021 IGI Global. All rights reserved.
Pramanik S.; Samanta D.; Bandyopadhyay S.K.; Ghosh R.
International Journal of Information Security and Privacy, Vol-15, No. 3, pp. 48-64.
https://doi.org/10.4018/IJISP.2021070104 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108116672&doi=10.4018%2fIJISP.2021070104&partnerID=40&md5=f309155d5b6fcd18d41c3a363e37c6c3
Pramanik S., Haldia Institute of Technology, India; Samanta D., Christ University, India; Bandyopadhyay S.K., University of Calcutta, India; Ghosh R., Haldia Institute of Technology, India
Nontoxic photoluminescent tin oxide nanoparticles for cell imaging: Deep eutectic solvent mediated synthesis, tuning and mechanism
Non-toxic and photoluminescent (PL) tin oxide nanoparticle synthesis in Deep Eutectic Solvents (DESs) is being reported herein. Both radiation (electron beam and ? radiation) and solvothermal methods were employed for the synthesis. An electron beam radiation technique proved to be more appropriate in tuning the size and morphology compared to the solvothermal process. Addition of any external oxido-reductive or stabilizing agent could be avoided by the use of Reline (choline chloride?:?urea; 1?:?2) as the host matrix. Detailed analysis of the PL behaviour of the nanoparticles is another important aspect of this study. The oxygen vacancies and tin interstitials responsible for photoluminescence have been identified from the de-convoluted PL spectra of the nanoparticles. Time dependent PL kinetics depicts PL decay at ?1.2 ns due to near band edge emission and at ?3.15 ns due to defect state emission. The synthetic process has been standardized focusing on the size of the particles by varying all possible experimental parameters such as the temperature, concentration of the precursors, reaction time, dose of irradiation and dose rate. Synthesized nanoparticles have been characterized using XRD, XPS and EDX. TEM images illustrate nanomorphological differences obtained in the two methods. The probable mechanism of synthesis (both radiation and thermal) has been proposed based on the results obtained from transient studies using electron pulses and FTIR experiments. Cytotoxicity data demonstrate that the nanoparticles are suitable for application in biological studies involving cells up to a concentration of 10 ?M. Imaging experiments with these photoluminescent nanoparticles exhibit their ubiquitous distribution including the nucleus of the tumour cells, which signifies potential application of these NPs for targeted drug delivery in cancer chemotherapy. Furthermore, the nanoparticles exhibited excellent antioxidant properties in vitro. The findings herein can open up enormous possibilities for more advanced and dedicated research towards using this cheap and versatile nanomaterial in a variety of biomedical applications. 2021 The Royal Society of Chemistry.
Das L.; Koonathan L.D.; Kunwar A.; Neogy S.; Debnath A.K.; Adhikari S.
Materials Advances, Vol-2, No. 13, pp. 4303-4315.
https://doi.org/10.1039/d1ma00042j https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109303584&doi=10.1039%2fd1ma00042j&partnerID=40&md5=f84c44df1cf72f2e4ac06c5546aba09a
Das L., Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India, HomiBhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400094, India; Koonathan L.D., Christ College (Deemed to Be University), Bangalore, India; Kunwar A., Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India, HomiBhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400094, India; Neogy S., Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India; Debnath A.K., Technical Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India; Adhikari S., Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
Stirling number of the fourth kind and Lucky partitions of a finite set
Bell number; Lucky partition; Stirling number of the fourth kind; Stirling number of the second kind
The concept of Lucky k-polynomials and in particular Lucky ?polynomials was recently introduced. This paper introduces Stirling number of the fourth kind and Lucky partitions of a finite set in order to determine either the Lucky k- or Lucky ?-polynomial of a graph. The integer partitions influence Stirling partitions of the second kind. 2021 Azarbaijan Shahid Madani University.
Communications in Combinatorics and Optimization, Vol-6, No. 2, pp. 211-219.
Kok J., City of Tshwane, South Africa; Kureethara J.V., Department of Mathematics, Christ University, Bengaluru, India