A novel laccase-based biocatalyst for selective electro-oxidation of 2-thiophene methanol
2-thiophene carboxaldehyde; Carbon fiber paper electrode; Immobilization; Laccase; Poly (3-aminobenzoic acid); TEMPO
An effective biocatalyst was fabricated for TEMPO-mediated electrooxidation of 2-thiophene methanol. Laccase obtained from Trametes versicolor was covalently immobilized onto electrochemically polymerized ortho-amino benzoic acid (PABA) layer on carbon fiber paper (CFP) electrode. The composite material was characterized by Fourier transformed infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Optical profilometry (OP), and scanning electron microscopy (SEM). Electrochemical parameters were studied using cyclic voltammetry (CV). Moreover, the developed biocatalyst (Lac-PABA/CFP) was used for selective conversion of 2-thiophene methanol to 2-thiophene carboxaldehyde using 2,2,6,6-Tetramethyl-1-piperidinyloxy, free radical (TEMPO) as a mediator. The formation of the product was confirmed via FTIR, GCMS, 1HNMR and 13CNMR. The enzyme activity of free and immobilized laccase was studied using 2, 2?-Azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) substrate at optimal conditions. Computational In silico analysis also suggested the presence of active sites (T2/T3 trimeric sites-copper ions) in laccase (PDB id: 1KYA's) interacting amino acid residues with the TEMPO and 2-thiophene methanol. Additionally, molecular dynamics simulations revealed that 2-thiophene methanol as compared to TEMPO is more stable (better RMSD, RMSF) in interacting with laccase specifically having strong interaction residues at Asp206, Glu242, Gly262, Gln293, and Glu302. Furthermore, the proposed strategy was confirmed by assessing the various interactions using computational tools. This work would be highly beneficial to develop an electrocatalyst for effective synthesis of 2-thiophene carboxaldehyde, a common intermediate in pharmaceutical, agrochemical, dye, fertilizer and chemical industries. 2021
Benny L.; Cherian A.R.; Varghese A.; Sangwan N.; Avti P.K.; Hegde G.
https://doi.org/10.1016/j.mcat.2021.111999 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119287683&doi=10.1016%2fj.mcat.2021.111999&partnerID=40&md5=eb1538da8a533179a641f58f36e74f93
Benny L., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Cherian A.R., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Varghese A., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Sangwan N., Department of Biophysics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India; Avti P.K., Department of Biophysics, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012, India; Hegde G., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India, Center for Advanced Research and Development (CARD), CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India
A Novel Approach for Fractional (1 + 1 ) -Dimensional BiswasMilovic Equation
Caputo fractional derivative; Fractional BiswasMilovic equation; Laplace transform; q-Homotopy analysis method
In this paper, we find the solution for (1 + 1 ) -dimensional fractional Biswas-Milovic (FBM) equation using the q-homotopy analysis transform method (q-HATM). The Biswas-Milovic equation is a generalization of the nonlinear Schringer (NLS) equation. The future scheme is the elegant mixture of q-homotopy analysis scheme with Laplace transform technique and fractional derivative considered in Caputo sense. To validate and illustrate the competence of the method, we examine the projected model in terms of arbitrary order. Moreover, the nature of the attained results have been presented in 3D plots and contour plots for different value of the order. The gained consequences show that, the hired algorithm is highly accurate, easy to implement, and very operative to investigate the nature of complex nonlinear models ascended in science and engineering. 2021, The Author(s), under exclusive licence to Springer Nature India Private Limited.
Prakasha D.G.; Veeresha P.; Baskonus H.M.
International Journal of Applied and Computational Mathematics, Vol-7, No. 5
Prakasha D.G., Department of Mathematics, Davangere University, Shivagangothri, Davangere, 577007, India; Veeresha P., Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed To Be University), Bengaluru, 560029, India; Baskonus H.M., Department of Mathematics and Science Education, Faculty of Education, Harran University, Sanliurfa, Turkey
A hybrid level shifted carrier-based PWM technique for modular multilevel converters
This paper presents a hybrid level shifted carrier-based pulse width modulation (HLSC-PWM) technique for modular multilevel converters (MMCs). The concept of the proposed HLSC-PWM method is developed by combining the principles of phase disposition PWM (PD-PWM), phase opposition disposition PWM (POD-PWM), and alternate phase opposition disposition PWM (APOD-PWM) methods. The main aim of the proposed HLSC-PWM method is to generate an output voltage with half-wave and quarter-wave symmetries. The generated symmetrical PWM output voltage based on the proposed HLSC-PWM method provides less total harmonic distortion (THD) and enhances the DC-Link voltage utilization (DCLVU). A generalized mathematical model is formulated to develop a single HLSC for MMC with an N number of submodules (SMs) per arm. Theoretical analysis of DCLVU for the proposed method is described. The functionality and performance of the HLSC-PWM method are carried out on a three-phase five-level MMC in MATLAB/Simulink. A hardware prototype of a single-phase five-level MMC is designed for experimental validation. The proposed HLSC-PWM method is implemented on an Altera/Cyclone I series (EP1C12Q240C8N) field-programmable gate array (FPGA), simulation and experimental results are presented. 2021 The Authors. IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology
Aswini Kumar M.; Gopi A.K.; Biswas J.; Barai M.
IET Power Electronics, Vol-14, No. 13, pp. 2219-2233.
https://doi.org/10.1049/pel2.12173 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111887984&doi=10.1049%2fpel2.12173&partnerID=40&md5=809b0a5fade6e4f763cb8c3a78530a47
Aswini Kumar M., Electrical Engineering Department, NIT-Calicut, Calicut, India; Gopi A.K., Electrical Engineering Department, NIT-Calicut, Calicut, India; Biswas J., Department of Computer Science, Christ University, Bengaluru, India; Barai M., Electrical Engineering Department, NIT-Calicut, Calicut, India
NLP-based personal learning assistant for school education
Intelligent tutoring system chatbot; Natural language processing; Rasa; Scratch
Computer-based knowledge and computation systems are becoming major sources of leverage for multiple industry segments. Hence, educational systems and learning processes across the world are on the cusp of a major digital transformation. This paper seeks to explore the concept of an artificial intelligence and natural language processing (NLP) based intelligent tutoring system (ITS) in the context of computer education in primary and secondary schools. One of the components of an ITS is a learning assistant, which can enable students to seek assistance as and when they need, wherever they are. As part of this research, a pilot prototype chatbot was developed, to serve as a learning assistant for the subject Scratch (Scratch is a graphical utility used to teach school children the concepts of programming). By the use of an open source natural language understanding (NLU) or NLP library, and a slack-based UI, student queries were input to the chatbot, to get the sought explanation as the answer. Through a two-stage testing process, the chat-bot's NLP extraction and information retrieval performance were evaluated. The testing results showed that the ontology modelling for such a learning assistant was done relatively accurately, and shows its potential to be pursued as a cloud-based solution in future. 2021 Institute of Advanced Engineering and Science. All rights reserved.
International Journal of Electrical and Computer Engineering, Vol-11, No. 5, pp. 4522-4530.
Institute of Advanced Engineering and Science
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.11591/ijece.v11i5.pp4522-4530 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85107272854&doi=10.11591%2fijece.v11i5.pp4522-4530&partnerID=40&md5=764508c4a3ce0bf31deab1eb52fa501c
Mathew A.N., Department of Computer Science, CHRIST (Deemed to Be University), India; Rohini V., Department of Computer Science, CHRIST (Deemed to Be University), India; Paulose J., Department of Computer Science, CHRIST (Deemed to Be University), India
An efficient nonlinear access policy based on quadratic residue for ciphertext policy attribute based encryption
Access policy; Ciphertext policy attribute based encryption; Encryption; Non-linear secret- sharing scheme; Quadratic residue
Ciphertext Policy Attribute Based Encryption (CP-ABE) is an efficient encryption scheme as data owner is making decision about the attributes that can access his data and adding that attributes to access structure while encrypting that message. Most existing CP-ABE scheme are based traditional access structure such as linear secret sharing scheme which incur large ciphertext size and linearly increases according to the number of attributes. And those schemes have more computational overhead for calculating share for each attribute and when recalculating secret in data user side. In this paper, we propose a different secret sharing scheme that can be used in access policy for CP-ABE which will reduce the size of ciphertext and there by communication overhead. Furthermore, the proposed scheme reduced computational overhead of secret sharing scheme and improved overall efficiency of the scheme. 2021 Little Lion Scientific
Journal of Theoretical and Applied Information Technology, Vol-99, No. 21, pp. 5050-5057.
Ancy P.R., CSE Dept, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, India; Krishna A.V.N., CSE Dept, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, India
Discovery of 2716 hot emission-line stars from LAMOST DR5
We present a catalog of 3339 hot emission-line stars (ELSs) identified from 451 695 O, B and A type spectra, provided by LAMOST Data Release 5 (DR5). We developed an automated Python routine that identified 5437 spectra having a peak between 6561 and 6568 False detections and bad spectra were removed, leaving 4138 good emission-line spectra of 3339 unique ELSs. We re-estimated the spectral types of 3307 spectra as the LAMOST Stellar Parameter Pipeline (LASP) did not provide accurate spectral types for these emission-line spectra. As Herbig Ae/Be stars exhibit higher excess in near-infrared and mid-infrared wavelengths than classical Ae/Be stars, we relied on 2MASS and WISE photometry to distinguish them. Finally, we report 1089 classical Be, 233 classical Ae and 56 Herbig Ae/Be stars identified from LAMOST DR5. In addition, 928 B[em]/A[em] stars and 240 CAe/CBe potential candidates are identified. From our sample of 3339 hot ELSs, 2716 ELSs identified in this work do not have any record in the SIMBAD database and they can be considered as new detections. Identification of such a large homogeneous set of emission-line spectra will help the community study the emission phenomenon in detail without worrying about the inherent biases when compiling from various sources. 2021 National Astronomical Observatories, CAS and IOP Publishing Ltd..
Shridharan B.; Mathew B.; Nidhi S.; Anusha R.; Arun R.; Kartha S.S.; Kumar Y.B.
Research in Astronomy and Astrophysics, Vol-21, No. 11
Shridharan B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Mathew B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Nidhi S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Anusha R., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Arun R., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Kartha S.S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Kumar Y.B., Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, China
Optimized task group aggregation-based overflow handling on fog computing environment using neural computing
ABC; Fog computing; Neural computing and ANN; Overflow handling; Resource scheduling; TGA; Virtual machines
It is a non-deterministic challenge on a fog computing network to schedule resources or jobs in a manner that increases device efficacy and throughput, diminishes reply period, and maintains the system well-adjusted. Using Machine Learning as a component of neural computing, we developed an improved Task Group Aggregation (TGA) overflow handling system for fog computing environments. As a result of TGA usage in conjunction with an Artificial Neural Network (ANN), we may assess the models QoS characteristics to detect an overloaded server and then move the models data to virtual machines (VMs). Overloaded and underloaded virtual machines will be balanced according to parameters, such as CPU, memory, and bandwidth to control fog computing overflow concerns with the help of ANN and the machine learning concept. Additionally, the Artificial Bee Colony (ABC) algorithm, which is a neural computing system, is employed as an optimization technique to separate the services and users depending on their individual qualities. The response time and success rate were both enhanced using the newly proposed optimized ANN-based TGA algorithm. Compared to the present works minimal reaction time, the total improvement in average success rate is about 3.6189 percent, and Resource Scheduling Efficiency has improved by 3.9832 percent. In terms of virtual machine efficiency for resource scheduling, average success rate, average task completion success rate, and virtual machine response time are improved. The proposed TGA-based overflow handling on a fog computing domain enhances response time compared to the current approaches. Fog computing, for example, demonstrates how artificial intelligence-based systems can be made more efficient. 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Arri H.S.; Khosa R.S.; Jha S.; Prashar D.; Joshi G.P.; Doo I.C.
https://doi.org/10.3390/math9192522 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116607183&doi=10.3390%2fmath9192522&partnerID=40&md5=d392508c32f799bad2ed9bb8ef9f6a09
Arri H.S., School of Computer Science and Engineering, Lovely Professional University, Phagwara, Punjab, 144411, India; Khosa R.S., School of Computer Science and Engineering, Lovely Professional University, Phagwara, Punjab, 144411, India; Jha S., School of Computational Sciences, CHRIST (Deemed to be University), Mariam Nagar, Meerut Road, Delhi NCR, Ghaziabad, 201003, India; Prashar D., School of Computer Science and Engineering, Lovely Professional University, Phagwara, Punjab, 144411, India; Joshi G.P., Department of Computer Science and Engineering, Sejong University, Gwangjin-gu, Seoul, 05006, South Korea; Doo I.C., Artificial Intelligence Education, Hankuk University of Foreign Studies, Dongdaemun-gu, Seoul, 02450, South Korea
Tracking Greenfield FDI During the COVID-19 Pandemic: Analysis by Sectors
COVID-19 crisis; foreign direct investment (FDI); GFDI countries; GFDI industries; global financial crisis; Greenfield foreign direct investment (GFDI)
We study the trends and fluctuations in greenfield foreign direct investment (GFDI) during the first wave of the COVID-19 pandemic crisis on a global scale. We analyse the data of a data set of GFDI provided by fDi Markets (Financial Times) to understand the contraction of GFDI during the first three quarters of the year 2020, taking into account the sector of the investment and the host and home country. We analyse both the long-run trends and the quarter-over-quarter changes in GFDI to capture its fluctuations before and during the first wave of the COVID-19 crisis and the 2008 global financial crisis. Our findings cast light on which countries and industries GFDIs were most affected by the pandemic crisis and draw a comparison to the global financial crisis. To our surprise, many services industries have shown unexpected resilience of GFDI due to the flexibility for remote work. On the contrary, GFDI in the manufacturing industries, as well as the extractives and the utility industries, has shown a dramatic decline during the pandemic. These contractions raise questions of stability and resilience of the global supply chains these industries are a part of. JEL Codes: F21. 2021 Indian Institute of Foreign Trade.
Doytch N.; Yonzan N.; Reddy K.; De Beule F.
Foreign Trade Review, Vol-56, No. 4, pp. 454-475.
All Open Access; Hybrid Gold Open Access
Doytch N., Brooklyn College, Koppelman School of Business, City University of New York, Brooklyn, NY, United States, Graduate Center, Program in Economics, City University of New York, Brooklyn, NY, United States, School of Government, Ateneo de Manila University, Quezon City, Philippines; Yonzan N., Graduate Center, Program in Economics, City University of New York, Brooklyn, NY, United States, The World Bank, Washington, DC, United States; Reddy K., Department of Economics, Christ (Deemed to be University), BGR Campus, Bangalore, India; De Beule F., Department of Management, Strategy and Innovation, Faculty of Economics and Business, KU Leuven, Belgium
Value-based teaching English language and literature
dharma (duty); human behaviour; moral; value education
Aim. The ultimate aim became the realisation of the political ideas of democracy, equality, and social justice (Orlenius, 2001; Svingby, 1994, p. 57). The current study aimed to explore the concept of value education at Poornaprajna institutions that have adopted value education in their curriculum. Methods. The study was designed in a qualitative exploratory research approach. The researcher had adopted the interviews for a case study as a microscopic social study through observation and also studied the archival records in Poornaprajna institutions. The informal group interviews were administered as part of a qualitative research approach, which aimed to collect data from twenty eight English teachers and students of Poornaprajna institutions. Result. The validity and trustworthiness of the study were established by adopting Miles and Hubemans formula, which amounted to 0.91. The exploration and findings revealed the need and implication of value education in the present scenario. Further-more, the data analysis revealed that value education is a process that begins at home and continues in society, and further, it continues in formal educational institutions. Conclusion. The study envisions that the educational institutions must integrate the curriculum with value education so that students cultural worlds, meanings they attribute to behaviour, events which essentially lead to the developmental process of the society. The National Education Policy 2020, aims to universalise education in India by 2025; it also aims at inter-and multidisciplinary approaches in Indian education. The pre-sent study juxtaposes an interdisciplinary approach to English and value education. 2021, Pro Scientia Publica Foundation. All rights reserved.
Journal of Education Culture and Society, Vol-12, No. 2, pp. 59-66.
https://doi.org/10.15503/jecs2021.2.59.66 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85149323516&doi=10.15503%2fjecs2021.2.59.66&partnerID=40&md5=acb012b1f565ecb9a00b9a6dbf717b47
Prahaladaiah D., Department of Education, CHRIST (Deemed to be University), Hosur Road, Bhavaninagar, Bengaluru, 560029, India
Effect of rotation on Brinkman-Bard convection of a Newtonian nanoliquid using local thermal non-equilibrium model
Convection; Local thermal non-equilibrium; Nanoliquid; Porous medium; Rotation
Rayleigh-Bard-Taylor convection in a Newtonian, nanoliquid-saturated high porous medium using the local thermal non-equilibrium model (LTNE) is studied analytically using the single term Galerkin technique. The Bousinessq approximation is considered to be valid and the exerted centrifugal force due to rotation is taken. A high porosity porous material glass reinforced fiber with porosity 0.88% is considered and hence the Brinkman model is adopted. The rate of rotation is quantified by the Taylor number and the stability of the system is controlled by thermal Rayleigh number. The expression for the critical eigenvalue (Rayleigh number) is obtained for both idealistic and realistic boundary conditions, that is, stress-free, isothermal and rigid-rigid, isothermal boundary conditions. The presumption of LTNE advances the inception of convection and increases the transport of heat in comparison with that of the local thermal equilibrium (LTE) assumption whereas the opposite phenomenon is seen with the effect of rotation. The effect of various non-dimensional parameters on the convection onset and on transport of heat is also investigated. The results of Rayleigh-Bard-Taylor convection using the LTE assumption are obtained as limiting cases of the present study for infinite values of the ratio of thermal conductivities and the interphase heat transfer coefficient. 2021 Elsevier Ltd
Siddheshwar P.G.; Sakshath T.N.; Siddabasappa C.
Thermal Science and Engineering Progress, Vol-25
https://doi.org/10.1016/j.tsep.2021.100994 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108992803&doi=10.1016%2fj.tsep.2021.100994&partnerID=40&md5=501bc35f4566d2b32ef7dd24447fe701
Siddheshwar P.G., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, India; Sakshath T.N., Department of Mathematics and Statistics, M S Ramaiah University of Applied Sciences, Bengaluru, 560058, India; Siddabasappa C., Department of Mathematics and Statistics, M S Ramaiah University of Applied Sciences, Bengaluru, 560058, India
Non-enzymatic electrochemical determination of salivary cortisol using ZnO-graphene nanocomposites
Electrochemically deposited ZnO nanoparticles on a pencil graphite electrode (PGE) coated with graphene generate a noteworthy conductive and selective electrochemical sensing electrode for the estimation of cortisol. Electrochemical techniques such as cyclic voltammetry (CV) analysis and electrochemical impedance spectroscopic (EIS) tests were adopted to analyze and understand the nature of the modified sensor. Surface morphological analysis was done using various spectroscopic and microscopic techniques like X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Structural characterization was conducted by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The effect of scan rate, concentration, and cycle numbers was optimized and reported. Differential pulse voltammetric (DPV) analysis reveals that the linear range for the detection of cortisol is 5 10-10M - 115 10-10 M with a very low-level limit of detection value (0.15 nM). The demonstrated methodology has been excellently functional for the determination of salivary cortisol non-enzymatically at low-level concentration with enhanced selectivity despite the presence of interfering substances. The Royal Society of Chemistry.
Rison S.; Rajeev R.; Bhat V.S.; Mathews A.T.; Varghese A.; Hegde G.
https://doi.org/10.1039/d1ra07366d https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120652046&doi=10.1039%2fd1ra07366d&partnerID=40&md5=e2ee2ab67950b608297242b5d9f7209e
Rison S., Christ Academy Institute for Advanced Studies, Christ Nagar, Bangalore, 560083, India, Department of Chemistry, Christ (Deemed to Be University), Bangalore, 560029, India; Rajeev R., Department of Chemistry, Christ (Deemed to Be University), Bangalore, 560029, India; Bhat V.S., Centre for Nano-materials and Displays, B.M.S College of Engineering, Bull Temple Road, Bangalore, 560019, India; Mathews A.T., Department of Chemistry, Christ (Deemed to Be University), Bangalore, 560029, India; Varghese A., Department of Chemistry, Christ (Deemed to Be University), Bangalore, 560029, India; Hegde G., Department of Chemistry, Christ (Deemed to Be University), Bangalore, 560029, India, Centre for Advanced Research and Development (CARD), Christ (Deemed to Be University), Bangalore, 560029, India
Assembly of discrete and oligomeric structures of organotin double-decker silsesquioxanes: Inherent stability studies
Double-decker silsesquioxane (DDSQ), a type of incompletely condensed silsesquioxane, has been used as a molecular precursor for synthesizing new organotin discrete and oligomeric compounds. The equimolar reaction between DDSQ tetrasilanol (DDSQ-4OH) and Ph2SnCl2 in the presence of triethylamine leads to obtaining discrete [Ph4Sn2O4(DDSQ)(THF)2] (1). The change of sterically bulky aryl Ph2SnCl2 precursor to linear alkyl nBu2SnCl2 led to the isolation of oligomeric [nBu4Sn2O4(DDSQ)] (2). The structures of compounds 1 and 2 have been demonstrated using single-crystal X-ray diffraction measurements. Indeed, the formation of oligomeric organotin DDSQ compound (2) was determined using GPC and MALDI-TOF mass spectroscopy. In compound 1, the geometry of the tin atom is five-coordinated trigonal bipyramidal by two phenyl groups, two Si-O from DDSQ and one tetrahydrofuran. Compound 2 contains four coordinated two peripheral tin atoms and two five-coordinated central tin atoms, in which, the fifth coordinating oxo groups in the central tin atoms create the bridge between two different DDSQ units that leads to the formation of oligomeric structure. Density functional theory calculations on organotin DDSQs infer that the obtained lattice energy for compound 1 is far higher than for the case of compound 2, which indicates that the crystal of compound 1 is better stabilized in its crystal lattice with stronger close packing via intermolecular interactions between discrete molecules with coordinated THF compared to the crystal of compound 2. The greater stability arises mainly due to the sterically bulkier phenyl groups attached to the tin centers in compound 1, which provide accessibility for accommodating the THF molecule per tin via Sn-THF bonding, while contrarily the smaller n-butyl groups aid the polymerization of the four repeating units of [SnSi4O7] or two Sn2O4(DDSQ) through ?-oxo groups. Both compounds 1 and 2 were chosen to be promising precursors for the synthesis of ceramic tin silicates. The thermolysis of 2 at 1000 C afforded the mixture of crystalline SnSiO4 and SiO2 but the same mixture was only formed by thermolysis of 1 at relatively higher temperature (1500 C), which infers that compound 1 is more stable than compound 2 that is in good synergy with theoretical lattice energy. The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
Loganathan P.; Pillai R.S.; Jeevananthan V.; David E.; Palanisami N.; Bhuvanesh N.S.P.; Shanmugan S.
New Journal of Chemistry, Vol-45, No. 43, pp. 20144-20154.
https://doi.org/10.1039/d1nj03128g https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119263516&doi=10.1039%2fd1nj03128g&partnerID=40&md5=3a7e18ac4be8c6528e07ead8dd79c281
Loganathan P., Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Pillai R.S., Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India, Department of Chemistry, Christ University, Karnataka, Bangalore, 56029, India; Jeevananthan V., Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; David E., Centre for Functional Materials, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Tamil Nadu, Vellore, 632014, India; Palanisami N., Centre for Functional Materials, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Tamil Nadu, Vellore, 632014, India; Bhuvanesh N.S.P., X-ray Diffraction Laboratory, Department of Chemistry, Texas AandM University, College Station, 77842, TX, United States; Shanmugan S., Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India
Reiner-Rivlin nanomaterial heat transfer over a rotating disk with distinct heat source and multiple slip effects
exponential space-based heat source; multiple slip effect; nanomaterial; O363; regression analysis; Reiner-Rivlin fluid; rotating surface
The thermodynamic features of the Reiner-Rivlin nanoliquid flow induced by a spinning disk are analyzed numerically. The non-homogeneous two-phase nanofluid model is considered to analyze the effect of nanoparticles on the thermodynamics of the Reiner-Rivlin nanomaterial, which also includes a temperature-dependent heat source (THS) and an exponential space-dependent heat source (ESHS). Further, the transfer of heat and mass is analyzed with velocity slip, volume fraction jump, and temperature jump boundary conditions. The finite difference method-based routine is used to solve the complicated differential equations formed after using the von-Karman similarity technique. Limiting cases of the present problem are found to be in good agreement with benchmarking studies. The relationship of the pertinent parameters with the heat and mass transport is scrutinized using correlation, which is further evaluated based on the probable error estimates. Multivariable models are fitted for the friction factor at the disk and heat transport, which accurately predict the dependent variables. The Reiner-Rivlin nanoliquid temperature is influenced comparatively more by the ESHS than by the THS. The Nusselt number is decreased by the ESHS and THS, whereas the friction factor at the disk is predominantly decremented by the wall roughness aspect. The increment in the non-Newtonian characteristic of the liquid leads more fluid to drain away in the radial direction far from the disk compared with the fluid nearby the disk in the presence of the centrifugal force during rotation. The increased thermal and volume fraction slip lowers the nanoliquid temperature and nanoparticle volume fraction profiles. 2021, Shanghai University.
Sabu A.S.; Mackolil J.; Mahanthesh B.; Mathew A.
Applied Mathematics and Mechanics (English Edition), Vol-42, No. 10, pp. 1495-1510.
Springer Science and Business Media B.V.
Sabu A.S., Department of Mathematics, St. Thomas College (Autonomous), Thrissur, 680001, Kerala, India; Mackolil J., Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, Karnataka, India; Mahanthesh B., Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, Karnataka, India; Mathew A., Department of Mathematics, St. Thomas College (Autonomous), Thrissur, 680001, Kerala, India
A numerical approach to the coupled atmospheric ocean model using a fractional operator
CaputoFabrizio derivative; El Nino-Southern oscillation model; fixed point theorem
In the present framework, the coupled mathematical model of the atmosphere-ocean system called El Nino-Southern Oscillation (ENSO) is analyzed with the aid Adams-Bashforth numerical scheme. The fundamental aim of the present work is to demonstrate the chaotic behaviour of the coupled fractional-order system. The existence and uniqueness are demonstrated within the frame of the fixed-point hypothesis with the CaputoFabrizio fractional operator. Moreover, we captured the chaotic behaviour for the attained results with diverse order. The effect of the perturbation parameter and others associated with the model is captured. The obtained results elucidate that, the present study helps to understand the importance of fractional order and also initial conditions for the nonlinear models to analyze and capture the corresponding consequence of the fractional-order dynamical systems. 2021 by the authors.
Mathematical Modelling and Numerical Simulation with Applications, Vol-1, No. 1, pp. 1-10.
https://doi.org/10.53391/mmnsa.2021.01.001 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116482235&doi=10.53391%2fmmnsa.2021.01.001&partnerID=40&md5=b0833684613fbb157de85c1bb103ace7
Veeresha P., Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India
Acacia auriculiformisDerived Bimodal Porous Nanocarbons via Self-Activation for High-Performance Supercapacitors
organic electrolyte; porous carbon; pyrolysis; self-activation; supercapacitors
Carbon nanomaterials derived from Acacia auriculiformis pods as electrodes for the electrochemical double-layer capacitors were explored. Four pyrolysis temperatures were set (400, 600, 800, and 1,000C) to understand the role of temperature in biomass pyrolysis via a possible self-activation mechanism for the synthesis of carbon materials. The carbon materials synthesized at 800C (AAC800) were found to exhibit a well-organized hierarchical porous structure, quantified further from N2 adsorption/desorption isotherms with a maximum specific surface area of 736.6m2/g. Micropores were found to be contributing toward enhancing the specific surface area. AAC800 exhibited a maximum specific capacitance of 176.7F/g at 0.5A/g in 6.0M KOH electrolyte in a three-electrode setup. A symmetric supercapacitor was fabricated using AAC800 as an active material in an organic electrolyte composed of 1.0M tetraethylammonium tetrafluoroborate (TEABF4) as a conducting salt in the acetonitrile (ACN) solvent. The self-discharge of the cell/device was analyzed from fitting two different mathematical models; the cell also exhibited a remarkable coulombic efficiency of 100% over 10,000 charge/discharge cycles, retaining ?93% capacitance at 2.3V. Copyright 2021 Bhat, Jayeoye, Rujiralai, Sirimahachai, Chong and Hegde.
Bhat V.S.; Jayeoye T.J.; Rujiralai T.; Sirimahachai U.; Chong K.F.; Hegde G.
https://doi.org/10.3389/fenrg.2021.744133 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117115763&doi=10.3389%2ffenrg.2021.744133&partnerID=40&md5=3d60ae24b10dd13346124601e9b3a469
Bhat V.S., Centre for Nano-materials and Displays (CND), B.M.S. College of Engineering, Bangalore, India, Department of Materials Science, Mangalore University, Mangalore, India; Jayeoye T.J., Division of Physical Science, Faculty of Science, Prince of Songkla University, Songkhla, Thailand; Rujiralai T., Division of Physical Science, Faculty of Science, Prince of Songkla University, Songkhla, Thailand; Sirimahachai U., Division of Physical Science, Faculty of Science, Prince of Songkla University, Songkhla, Thailand; Chong K.F., Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang, Gambang, Malaysia; Hegde G., Centre for Nano-materials and Displays (CND), B.M.S. College of Engineering, Bangalore, India, CHRIST (Deemed to be University), Bengaluru, India
The onset of RayleighBard convection and heat transfer under two-frequency rotation modulation
Coriolis force; nonsinusoidal waveform; rotation modulation; sinusoidal waveform; two-frequency
The impact of 16 combinations of sinusoidal (sine) and nonsinusoidal (square, triangular, and sawtooth) time-periodic Coriolis force (rotation modulation) on RayleighBard convection in a Newtonian liquid is studied in this paper. This consideration is made to capture the possible effects of two-frequency rotation modulation on stability, that is, the onset of convection and the simultaneous amount of heat transfer in the system. The Venezian approach has been asserted on the linearized Lorenz model to derive the correction Rayleigh number as a function of the two frequencies. The Lorenz model with nonlinearities is evaluated numerically to assess the quantity of heat transfer in the system. The present study states that in comparison with existing studies of no-modulation and single-frequency rotation modulation, two-frequency rotation modulation yields higher stability bounds and thus diminishes the heat transfer. Heat transfer is found to be enhanced by a pair of coprime integers associated with the harmonics in the system. 2021 Wiley Periodicals LLC
Heat Transfer, Vol-50, No. 7, pp. 7472-7494.
https://doi.org/10.1002/htj.22239 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109587808&doi=10.1002%2fhtj.22239&partnerID=40&md5=786e273cedcfbdd672e15c6a105d091f
Mathew A., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, Karnataka, India; Pranesh S., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, Karnataka, India
A global perspective on psychologists' and their organizations' response to a world crisis; [Una perspectiva global sobre la respuesta de los psicogos y sus organizaciones a una crisis mundial]
COVID-19; Governance; International psychology; Organizational response; Public policy
Around the world, individual psychologists have stepped up to deliver essential services to address the social and emotional sequelae of the COVID-19 pandemic. Many psychological organizations have also responded to this public health crisis, though their efforts may be less widely recognized. Psychological organizations engaged in preventive and mitigation efforts targeted, among others, the general public, local communities, and high-risk groups such as health care providers. They disseminated mental health information to the general public, trained laypersons to provide psychological first aid, and used research to design and evaluate public health responses to the pandemic. In some countries, psychological organizations contributed to the design and implementation of public health policies and practices. The nature of these involvements changed throughout the pandemic and evolved from reactive to proactive, from local to international. Several qualities appear key to the value, impact, and success of these efforts. These include organizational agility and adaptability, the ability to overcome their political inertia and manage conflict, recognizing the need to address cultural differences, and allocating limited resources to high-risk and resource-depleted constituencies where it was needed most. 2021, Sociedad Interamericana de Psicologia. All rights reserved.
Gutirez G.; Barbarin O.; KlicperovBaker M.; Padakannaya P.; Thompson A.; Crowe S.; Khoury B.
Interamerican Journal of Psychology, Vol-55, No. 2
https://doi.org/10.30849/ripijp.v55i2.1713 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85118228839&doi=10.30849%2fripijp.v55i2.1713&partnerID=40&md5=93b778d2b5eea3ff4e012f5012a6bcf7
Gutirez G., Universidad Nacional de Colombia, Bogot Colombia; Barbarin O., University of Maryland, College Park, United States; KlicperovBaker M., Czech Academy of Sciences, Prague, Czech Republic; Padakannaya P., Christ University, Bengaluru, India; Thompson A., University of the Bahamas, Nassau, Bahamas; Crowe S., La Trobe University, Melbourne, Australia; Khoury B., American University of Beirut, Beirut, Lebanon
Analyzing online food delivery industries using pythagorean fuzzy relation and composition
Choice of restaurants; Payment option; Pythagorean Fuzzy Relation; Quality of device; Speed of delivery
Food and beverages constitute a significant portion of the family expenditure, which motivates the food delivery companies in striving hard to meet the customer needs through their dynamic food delivery apps. The online food ordering system is one of the most profitable marketing strategies for restaurant businesses. The face of the restaurant industry has shifted from the traditional dine-in culture to takeaways, online ordering, and home deliveries. Digital technology and social media have a significant role in ensuring the efficiency and popularity of a food delivery app. The four essential factors for a food delivery company to satisfy the needs of the consumers in day to day life are choice of restaurants, speed of delivery, payment option and quality of service. The objective of this study is to discern and analyse these four essential factors adopted by the leading four food delivery companies and evaluate the perceptions of the consumers. The best online food delivering company is identified using Pythagorean Fuzzy Relation (PFR)and composition. The analysis concludes that Zomato food application is the best in consumers perception.The outcome of the survey is made more efficient by adopting a mathematical approach. Copyright IJHTS.
International Journal of Hospitality and Tourism Systems, Vol-14, No. 2, pp. 36-45.
Dinakaran U., Department of Hotel Management, Christ (Deemed to be University), Bangalore, Karnataka, India
Magnetic property applications of microwave method prepared zinc ion modified CoAl2O4 nanoparticles
Cobalt aluminate; DRS-UV and magnetic analysis; HR-SEM; XRD
Employing Microwave combustion technique and utilizing L-arginine as fuel pure Cobalt Aluminate and Zn doped Cobalt Aluminate nanoparticles (NPs) were prepared. XRD, DRS-UV, HRSEM and VSM techniques were used to investigate the structural, optical, morphological, and magnetic properties. The average crystallite size is found in the range of 15-24 nm. Elemental confirmation is done by aid of EDX spectra. The band gap values of the produced samples were discovered to be between 2.57 and 2.45 eV. At room temperature, the prepared samples showed diamagnetic magnetic characteristics, which were corroborated by MagnetizationField (MH) hysteresis curves. 2021, S.C. Virtual Company of Phisics S.R.L. All rights reserved.
Dash C.S.; Kamalakannan M.; Ramalingam R.J.; Lohedan H.; Arokiyaraj S.; Yuvaraj S.; Anitha G.; Subramani A.; Devi K.R.S.; Sundararajan M.
Digest Journal of Nanomaterials and Biostructures, Vol-16, No. 4, pp. 1287-1294.
Dash C.S., Department of Electronics and Communication Engineering, Centurion University of Technology and Management, Odisha, Bhubaneswar, 752 050, India; Kamalakannan M., Department of Basic Sciences, College of Fisheries Engineering, Dr. J. Jayalalithaa Fisheries University, Nagapattinam, 611 002, India; Ramalingam R.J., Department of Chemistry, College of Science, Kind Saud university, Riyadh, 11451, Saudi Arabia; Lohedan H., Department of Chemistry, College of Science, Kind Saud university, Riyadh, 11451, Saudi Arabia; Arokiyaraj S., Department of Food Science and Biotechnology, Sejong University, South Korea; Yuvaraj S., Department of Physics, Loyola College of Arts and Science, Mettala, Namakkal, 636 202, India; Anitha G., Department of Electronics and Communication Engineering, Saveetha University, Chennai, 602 105, India; Subramani A., Department of Chemistry, Apollo Arts and Science College, Poonamallee, 602 105, India; Devi K.R.S., Department of Chemistry, CHRIST(Deemed to be University), Bangalore, Karnataka, 560 029, India; Sundararajan M., PG& Research Department of Physics, Paavendhar College of Arts & Science, Salem, 636 121, India
Synthesis and characterization of Cr2AlC MAX phase for photocatalytic applications
Cationic dyes; Cr2AlC MAX phase; Degradation; Photocatalysis
MAX phase, a layered ternary carbide/nitride, displays both ceramic and metallic properties, which has significantly attracted the materials research. In this work, Cr2AlC MAX phase powder with high purity was fabricated via a facile and cost-effective pressure-less sintering methodology and utilized for photocatalytic degradation of different organic pollutants for the first time. Various characterization techniques were used for confirming the morphological and other physico-chemical properties of the catalyst. Cr2AlC MAX phase with a low band gap of 1.28 eV has shown 99% efficiency in the degradation of malachite green, an organic pollutant under visible light irradiation. The scavenger studies conclude that, O2?and h+ as the active species during the photocatalytic reaction. Furthermore, the kinetic study revealed that the reaction obeys pseudo-first-order kinetics and can be reused for four cycles without losing the activity. This novel approach can give new insight into the potential application of MAX phase materials in the field of wastewater treatment under visible light irradiation. 2021 Elsevier Ltd
Shalini Reghunath B.; Davis D.; Sunaja Devi K.R.
ISSN: 456535; PubMed ID: 34467941; CODEN: CMSHA
https://doi.org/10.1016/j.chemosphere.2021.131281 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109470646&doi=10.1016%2fj.chemosphere.2021.131281&partnerID=40&md5=a419f5bded7834fa7a7d856d9582ebd5
Shalini Reghunath B., Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India; Davis D., Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM Institute of Science and Technology (Deemed to be University), Chennai, 603203, Tamil Nadu, India; Sunaja Devi K.R., Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India