d) 2021-Scopus Open Access (PDF)

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Start date: 2021End date: 2021

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    RECENT DEVELOPMENT IN PREPARATION OF FOOD PACKAGING FILMS USING BIOPOLYMERS (Article)
    (Rynnye Lyan Resources, 2021-12) Suresh, S; Pushparaj, C; Subramani, R
    In the past decades, most materials used in the food packaging industry are nonbiodegradable materials that pose increased environmental concerns and sustainability issues. Hence, polymer-based biodegradable materials and edible films have been developed to increase the shelf life of food products. Especially, biopolymer-based nanomaterials are engineered with multifunctional characteristics because of their size, surface area, shelf life, thermal stability, and mechanical and barrier strength. These materials display enriched properties of biodegradability, antimicrobial activity, and biocompatibility and may have the possibility to replace plastic materials in future. Thus, this review offers a brief overview of the classification of biopolymers, key parameters that are important in food packaging films (including the role of plasticizers, cross-linkers, pH, temperature, and relative humidity), and recent applications of novel biopolymer nanocomposite materials used in the food industries.
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    CONTROLLABILITY OF HIGHER-ORDER FRACTIONAL DAMPED STOCHASTIC SYSTEMS WITH DISTRIBUTED DELAY (Article)
    (Springer Open, 2021) Arthi, G; Suganya, K; Yong-Ki, Ma
    In this paper, the controllability analysis is proposed for both linear and nonlinear higher-order fractional damped stochastic dynamical systems with distributed delay in Hilbert spaces which involve fractional Caputo derivative of different orders. Based on the properties of fractional calculus, the fixed point technique, and the construction of controllability Gramian matrix, we establish the controllability results for the considered systems. Finally, examples are constructed to illustrate the applicability of obtained results.
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    FINITE-TIME STABILITY OF MULTITERM FRACTIONAL NONLINEAR SYSTEMS WITH MULTISTATE TIME DELAY
    (Springer Open, 2021-02-06) Arthi, G; Brindha, N; Yong-Ki, Ma
    This work is mainly concentrated on finite-time stability of multiterm fractional system for with multistate time delay. Considering the Caputo derivative and generalized Gronwall inequality, we formulate the novel sufficient conditions such that the multiterm nonlinear fractional system is finite time stable. Further, we extend the result of stability in the finite range of time to the multiterm fractional integro-differential system with multistate time delay for the same order by obtaining some inequality using the Gronwall approach. Finally, from the examples, the advantage of presented scheme can guarantee the stability in the finite range of time of considered systems.
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    STOCK MARKET VOLATILITY TRANSMISSION AND INTERLINKAGE: EVIDENCE FROM BRICS
    (Horizon Research Publishing Corporation, 2021) Qamruzzaman, Md.; Rajnish, Kler; Theivanayaki, M; Salma, Karim
    No isolated financial markets are available due to global financial integration through trade liberation and FDI presence. Therefore, financial markets are subject to response to home economy events and pair economy movements. The study's motivation is to investigate the volatility transmission and interlinkage between financial markets in BRICS nations from January 01, 2001 to December 31, 2019. The study applies unit root tests, the test of cointegration, ARCH-GARCH effects, and the Non-granger causality test to expose interlinkages. Results of unit root tests expose variables are integrated in mixed order, i.e., few variables are stationary at a level I (0), and few variables are after first difference I (0). The cointegration test reveals the long-run association available in the empirical model, implying that the long-run BRICS stock markets act in the same direction. Results of ARCH-GARCH (1.1) disclose the presence of volatility persistence in the financial markets. Furthermore, the directional causality under the error correction term discloses that the feedback hypothesis explains the causality among financial markets in BRICS nations in the long run. On the other hand, a similar conclusion also derives from the Non-granger causality test.
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    AG-NI BIMETALLIC FILMON CAF2PRISM FOR HIGHSENSITIVE SURFACE PLASMON RESONANCE SENSOR
    (Photonics Letters of Poland, 2021-09-30) Ananthan, Nisha; Pandaram, Maheswari; Santhanakumar, Subanya; Ponnusamy, Munusamy Anbarasan; Karuppaiya, Balasundaram Rajesh; Zbigniew, Jaroszewicz
    We presenta surface plasmon resonance (SPR) structure based on the Kretschmann configurationincorporating bimetallic layers of noble (Ag) and magnetic materials (Ni)over a CaF2prism. Extensive numerical analysis based on transfer matrix theory has been performed to characterizesensor response considering sensitivity, full width at half maxima, and minimum reflection. Notably, the proposed structure, aftersuitably optimizing thethickness of bimetallic layer provides consistent enhancement of sensitivity over other competitive SPR structures. Hence,we believe that theproposed SPR sensor could find a new platform formedical diagnosis, chemical examination,and biological detection.
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    MOLECULAR INSIGHTS ON THE DIHYDROGEN BOND PROPERTIES OF METAL BOROHYDRIDE COMPLEXES UPON AMMONIATION
    (IOP Science, 2021) Saravanapriya, Arumugam; Abiram, Angamuthu; Praveena, Gopalan
    The dihydrogen bond (DHB) that exists between BHbold dotbold dotbold dotHN containing systems is known for the improved thermodynamic properties of complex hydrides. This study explores the stability and electronic properties of dihydrogen bonds (Hδ−bold dotbold dotbold dotHδ+) that exist between the protic hydrogen, Hδ+ in NH3 and hydridic hydrogen, Hδ− of BH4 in AMgBbold dotbold dotbold dotMB and AMgBbold dotbold dotbold dotAMB complexes (where M = Li, Na, K, Mg and Zn; and A = Amino group) using second order Moller-Plesset perturbation theory (MP2). The effect of metals and ammoniation in varying the nature of the DHB was revealed in quantum theory of atoms in molecule (QTAIM) analysis with the identification of non-covalent interactions. The calculated values of interaction energies were correlated well with the topological results. Furthermore, energy decomposition analysis (EDA), interaction energy and Bader charge analysis were calculated in order to interpret the role of non-bonded interaction on decomposition process. The calculated structural, QTAIM and EDA analysis reveal the presence of non bonded interaction in all the complexes. Overall analysis of the study reported that the process of adding amine group in alkali metal borohydrides increases charge distribution around the dispersion interaction which plays a vital role in hydrogen evolution process.
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    MAXIMUM INDEPENDENT SEIDEL ENERGY OF A GRAPH
    (IOP Science, 2021) Mary, U; Sreeja, S
    The concept of Maximum Independent Seidel energy EImaxS(G)of a simple connected graph Ghas been innovated by us and we have calculated the maximum independent seidel energies of some standard graphs. Also we have discovered few basic properties related to maximum independent seidel energy.
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    THEORETICAL INVESTIGATION OF INTERMOLECULAR DIHYDROGEN BONDS IN C2H2•••HM AND C2H4•••HM (M = LI, NA AND K) COMPLEXES: A DFT AND AB INITIO STUDY
    (Asian Journal of Chemistry, 2021-07-26) Parimala devi, D; Tom, Giju; Praveena, G; Abiram, A
    This study aims to investigate the dihydrogen bond formation in ethyne (C2H2) and ethene (C2H4) with alkali metal hydrides (HM; M = Li, Na and K) complexes using density functional theory (DFT) and ab initio methods. It mainly focuses on the comparison of the performances of different functionals of DFT and ab initio method on the intermolecular dihydrogen bonded complexes. The geometrical parameter and energy values agree with the formation of dihydrogen bonds in the complexes. Among the ethyne and ethene complexes, the smallest dihydrogen bond distance was formed by C2H2···HK and C2H4···HK, respectively. The C2H2 is found to form better dihydrogen bond (DHB) with alkali metal hydrides than C2H4. Among all the functionals, M06L was observed to predict shortest H···H bond distance, while M062X the longest. Natural bond orbital (NBO), quantum theory of atom in molecules (QTAIM) along with molecular electrostatic potential (MEP) analysis further confirms the dihydrogen bond formation.
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    INHIBITIVE EFFECT OF AN ALCOHOLIC EXTRACT OF A SEAWEED SARGASSUM MUTICUM IN CONTROLLING CORROSION OF MILD STEEL IN 0.5 N HCL
    (International Journal of Corrosion and Scale Inhibition, 2021-10-20) Jeslina, V; Kirubavathy, S J; Al-Hashem, A; Rajendran, S; Lacnjevac, C; Joany, R.M.
    The inhibitive effect of an alcoholic extract of a seaweed, namely, Sargassum Muticum, in controlling corrosion of mild steel in 0.5 N HCl has been evaluated by weight loss method (immersion period 1 day) and electrochemical techniques such as polarization study and AC impedance spectra. The protective film has been investigated by AFM and Vickers Hardness test. Weight loss method reveals that 500 ppm of inhibitor offers 99% inhibition efficiency to mild steel immersed in 0.5 N HCl. The adsorption of inhibitor molecules on the metal surface follows Langmuir adsorption isotherm. The R 2 value is very high, 0.998. Polarization study reveals that the corrosion potential is slightly shifted to anodic side. It is inferred that the inhibitor solution functions as mixed type corrosion inhibitor. In the presence of the inhibitor, the linear polarization resistance (LPR) increases and the corrosion current decreases. Because of the Blanket effect (formation of a protective film on the metal surface blocking the anodic sites and cathodic), electron transfer from the metal to the bulk of the solution is blocked. AC impedance spectra confirm the formation of a protective film on the metal surface. As the inhibitor concentration increases, the Rct value increases and the double layer capacitance (Cdl) decreases, the impedance increases and the phase angle increases due to the blocking effect on the metal surface. It is found to be a monolayer of protective film. The Vickers hardness of the inhibited metal surface is lower than that of polished metal but higher than that of corroded surface. The average roughness, RMS roughness and maximum peak-to-valley height of inhibited metal surface are lower than those of corroded metal surface but higher than those of polished metal surface. The outcome of the study may be used in pickling industry where HCl is used to remove rust and at the same time metal surface is protected.
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    INHIBITION OF CORROSION OF MILD STEEL BY AN ALCOHOLIC EXTRACT OF A SEAWEED SARGASSUM MUTICUM
    (Zastita Materijala, 2021) Victor David Arockiaraj, Mallika Jeslina; Suyambulingam, Jone Kirubavathy; Abdulhameed, Al-Hashem; Susai, Santhammal Rajendran; Joany, RM; Caslav, Lacnjevac
    An alcoholic extract of a sea weed Sargassum muticum has been used to control corrosion of mild steel in 0.5 N HCl. Weight loss method and Electrochemical studies have been used in this study. Weight loss study reveals that 500 ppm of the inhibitor offers 99.25 % inhibition efficiency. Polarization study reveals that the inhibitor functions as an anodic inhibitor at higher concentration. The AC impedance spectra confirm the formation of a protective film on the metal surface. Adsorption of inhibitor molecules on the metal surface follows Langmuir adsorption isotherm