Inhibition performances of imidazoline derivatives with different alkyl chain length for carbon steel in H2S acid solutions has been studied by polarization curves, AC impedance measurements, current transient, Atomic Force Microscopy (AFM) and Density Functional Theory (DFT) techniques. Results showed that the inhibition occurs through adsorption of the inhibitors molecules ...

The ecology of the human intestinal microflora and its interaction with the host are poorly understood. Though more and more data are being acquired, in part using modern molecular methods, development of a quantitative theory has not kept pace with this increase in observing power. This is in part due to the complexity of the system, and to the lack of simulation environments in which to test ...

The paper presents the methodology of modelling tooth flanks of cylindrical gears in the CAD environment. The modelling consists in a computer simulation of gear generation. A model of tooth flanks is an envelope curve of a family of envelopes that originate from the rolling motion of a solid tool model in relation to a solid model of the cylindrical gear. The surface stereometry and topography...

This paper concerns modelling and simulation of coupled heat and air flow in buildings. A brief overview of the current state in modelling this issue is included. Starting from a zonal mass balance approach, the paper describes a method used for the simultaneous solution of the associated non-linear equations, and the solution coupling of the heat and mass conservation equation-sets. By means o...

reservoir dams are among the main storage systems employed in agriculture for the several past decades. proper operation of these reservoirs is important for irrigation espe-cially in such arid and semi-arid areas like iran, and particularly during dry years. a computational framework for reservoir simulation and flood routing is hereby presented. a key aspect of the reservoir simulation is the...

Proposed object-oriented approaches are still in an initial stage of investigation and are mainly limited to modelling CAD applications which manipulate ill-deened, evolving and multifaceted objects. In this paper , we argue in favour of a model, called CEDAR, which aims at easing the modelling process by endowing object-oriented approach with a viewpoint notion. keywords: object-oriented datab...

In the face of Global Climate Change the scientific evaluation of possible impacts on the natural and social environment became more and more important in recent years. In this context computer-based simulation has emerged as a means of choice in many scientific disciplines as it facilitates predictions about future impacts of climate change based on well-known physical and societal relations. ...

This paper is an attempt to Numerical Modeling and Experimental Study of Air Flow in the Yazdi Wind-Towers. Wind Towers has been known as one of the most effective climatic elements in Iranian traditional architecture. This paper is an attempt to evaluating Yazdi wind-tower to discussion the two main questions: 1. What is the role of Orientation of wind-towers span, regarding to climate and he...

Ž . This paper presents a modelling method—GI-SIM GRAIrIDEF-Simulation —developed to meet the requirements of manufacturing system analysis and design. The GI-SIM method combines three important concepts of modelling methods Ž . conceptual, functional and simulation in an integrated structure. It enables a system analyst and designer to build system models from the basic functional specificatio...