Scottish Church College

About: Scottish Church College is a based out in . It is known for research contribution in the topics: Dissociative recombination & Quantum defect. The organization has 94 authors who have published 238 publications receiving 2172 citations.

Ratio-dependent predator–prey model: effect of environmental fluctuation and stability

Abstract: This paper deals with the problem of a ratio-dependent predator-prey model. The deterministic and stochastic behaviour of the model system around biologically feasible equilibria are studied. Conditions for which the deterministic model enter into Hopf-bifurcation are worked out. Stochastic stability of the system around positive interior equilibrium is studied. To substantiate our analytical findings numerical simulations are carried out for a hypothetical set of parameter values.

Dynamical analysis of toxin producing Phytoplankton–Zooplankton interactions

Abstract: In the present paper we consider a toxin producing phytoplankton–zooplankton model in which the toxin liberation by phytoplankton species follows a discrete time variation Firstly we consider the elementary dynamical properties of the toxic-phytoplankton–zooplankton interacting model system in absence of time delay Then we establish the existence of local Hopf-bifurcation as the time delay crosses a threshold value and also prove the existence of stability switching phenomena Explicit results are derived for stability and direction of the bifurcating periodic orbit by using normal form theory and center manifold arguments Global existence of periodic orbits is also established by using a global Hopf-bifurcation theorem Finally, the basic outcomes are mentioned along with numerical results to provide some support to the analytical findings

Investigating the role of globalization, and energy consumption for environmental externalities: Empirical evidence from developed and developing economies

Abstract: Achieving sustainable environmental development, while further avoiding environmental degradation is an unprecedented challenge for policymakers. This article aims to explore whether the Environmental Kuznets Curve (EKC) hypothesis holds if the relevant carbon emissions modelling approach includes both energy consumption and the Konjunkturforschungsstelle (KOF) globalization index. The analysis is performed through panel methods and for 67 developed and developing countries, spanning the period 1971–2018. The empirical results demonstrate that there is a significant and positive association between globalization and carbon emissions. At the same time, higher GDP increases carbon emissions, while higher coal energy also leads to higher emissions, with the coefficient of the squared GDP turning out to be negative, which lends amble support to the validity of the EKC hypothesis. The findings of this article might be helpful in policy making regarding overall energy structure, carbon emissions, and globalization trends in developing and developed countries.

Green Synthesized Copper Oxide Nanoparticles Ameliorate Defence and Antioxidant Enzymes in Lens culinaris.

Abstract: Biosynthesis of copper oxide nanoparticles (CuONPs) in a cost-effective and eco-friendly way has gained its importance. CuONPs has been prepared from copper sulfate by using Adiantum lunulatum whole plant extract. CuONPs have been characterized by X-ray diffraction, Fourier transform infrared spectroscopic, transmission electron microscope, etc. Mono-disperse, spherical, pure, and highly stable CuONPs have formed with an average diameter of 6.5 ± 1.5 nm. Biosynthesized CuONPs at different concentrations were applied to seeds of Lens culinaris. Physiological characteristics were investigated in the germinated seeds. Roots obtained from the seeds treated with 0.025 mgmL-1 concentration of CuONPs showed highest activity of different defence enzymes and total phenolics. However, at higher concentration it becomes close to control. It showed gradual increase of antioxidative enzymes, in accordance with the increasing dose of CuONPs. Likewise, lipid peroxidation and proline content gradually increased with the increasing concentration. Reactive oxygen species and nitric oxide generation was also altered due to CuONPs treatment indicating stress signal transduction. Finally, this study provides a new approach of the production of valuable CuONPs, is a unique, economical, and handy tool for large scale saleable production which can also be used as a potent plant defence booster instead of other commercial uses.

Multi-objective possibilistic model for portfolio selection with transaction cost

Abstract: In this paper, we introduce the possibilistic mean value and variance of continuous distribution, rather than probability distributions. We propose a multi-objective Portfolio based model and added another entropy objective function to generate a well diversified asset portfolio within optimal asset allocation. For quantifying any potential return and risk, portfolio liquidity is taken into account and a multi-objective non-linear programming model for portfolio rebalancing with transaction cost is proposed. The models are illustrated with numerical examples.