Antioxidant activity represents one of the important features of phenolic acids, such as hydroxyderivatives of cinnamic acid. However, in the case of cis-cinnamic acid derivatives, corresponding thermochemistry data can be still considered scarce. This work is focused on the two most relevant mechanisms of primary antioxidant action in gas-phase, n...

By Monika Biela, Peter Poliak, Andrea Kleinová, Vladimír Lukeš, Erik Klein

This study is focused on the joint effects of thermal radiation and magnetic field on an unsteady flow of natural convective, electrically conducting fluid past an irregular vertical channel in the presence of viscous dissipation. The magnetic field is applied normal to the channel. The coupled ordinary differential equations (ODE) are obtained usi...

By T. L. Oyekunle, S. A. Agunbiade

This research paper deals with a numerical algorithm based on the RCW method to solve a set of first-order ordinary differential equations. In this algorithm, the answer of each equation is considered as a polynomial of degree 2. The coefficients used in this polynomial are categorized into groups of free and fixed coefficients. The free coefficien...

By M. Rahmanzadeh, T. Asadi, M. Atashafrooz

An analytical model is developed for the flexural wave propagation of a continuous Timoshenko beam resting on elastic and metamaterial foundations. The metamaterial foundation consists of positive and negative springs with a damper. This added negative stiffness component is constructed in such a way to provide the same static stiffness and the sam...

By A. O. Oyelade, O. M. Sadiq

Ascorbyl radical is often used as a biomarker of oxidative stress in human organism. It is a product of the antioxidant activity of ascorbic acid and it is not expected to react further with biologically important molecules. For the first time, the reactivity of catecholamines and their precursors was investigated theoretically and experimentally t...

By Dušan Dimić, Đura Nakarada, Miloš Mojović, Jasmina Dimitrić Marković

In the current study, the interaction mechanisms between protonated neurotransmitters: octopamine (4-(2-amino-1-hydroxyethyl)phenol) and norepinephrine (4-[(1R)-2-amino-1-hydroxyethyl]benzene-1,2-diol) with the β-1 adrenergic receptor (β1AR) were examined by molecular docking, molecular dynamics (MD) simulations and MM/PBSA free energy ca...

By Žiko Milanović, Dušan Dimić, Jasmina Dimitrić Marković, Marijana Stanojević-Pirković, Edina Avdović, Zoran Marković

In this study, a new numerical method based on the combination of High Exploration Particle Swarm Optimization (HEPSO) and Moving Least Squares (MLS) is introduced to solve nonlinear porous media equations. The MLS scheme is employed to describe an appropriate discretized function, and the penalty method is implemented to convert the constrained pr...

By Mohammad Javad Mahmoodabadi, Ali Reza Ghanizadeh

In this research, analysis of entropy generation for mixed convection fluid flow in a trapezoidal enclosure is numerically investigated. To achieve this goal, the influences of Grashof number, Reynolds number and inclination angle of enclosure side walls on the distributions of the velocity and temperature fields and the values of entropy generatio...

By Meysam Atashafrooz, Mohsen Shafie

In this paper, the governing equations of continuity and momentum subjected to suitable boundary conditions have been solved numerically to investigate the fluid flow in stirred vessel of two-bladed impeller. The numerical simulations have been carried out in three-dimensions for laminar flow. The studied fluid was considered Newtonian and incompre...

By Houssem Laidoudi

Erosion caused by solid particles in curve pipes is one of the major concerns in the oil and gas industries. Small solid particles flow with a carrier liquid fluid and impact the inner wall of the piping, valves, and other equipment. These components face a high risk of solid particle erosion due to the constant collision, which may result in equip...

By Mohammad Sheikh Mamoo, Ataallah Soltani Goharrizi, Bahador Abolpour