Bi-viscosity Bingham plastic fluids are used to understand the rheological characteristics of pigment–oil suspensions, polymeric gels, emulsions, heavy oil, etc. In many industrial and engineering problems involving high-temperature situation, a linear density-temperature variation is inadequate describe convective heat transport. Therefore, nonlinear flow bi-viscous fluid (BVBF) through three ...

This paper presents a research and development project that will provide an extension to 2D geo-databases for handling large terrain data. It first discusses application requirements and system design, and then elaborates system architecture for optimal data organization and updating, efficient multi-resolution queries, and dynamic DTM generation. It then addresses technical issues related to d...

Computational fluid dynamic (CFD); Linearized two-dimensional transient flow (LTDT); Polar gridline transformation method. Abstract A novel derivation to transfer an actual domain with circular geometries to the computational domain, which is competent for application to computational fluid dynamics, is derived. Outcome formulas could be employed in cases of gridline transformation in the metho...

Digital Terrain Model (DTM) databases are one of the more common tools for precise and continuous representation of our natural environment. New data acquisition technologies yield rapid and frequent updating of existing topographic databases (from here on it will be referred to as DTMs). These technologies present high accuracies and resolution levels that were not known until recently. As a r...

LIght Detection And Ranging (LIDAR) is a technique, which allows for measuring a huge amount of object point coordinates with accuracies up to some centimeters in short time. Their conversion into a highly accurate Digital Terrain Model (DTM) requires a careful handling of the single processing steps, from the flight planning until the manual revision of the generated DTM, considering the diffe...

Until 1997, there was no formal teaching in tropical medicine in Arabian Peninsular countries, although many tropical diseases (for example, malaria, schistosomiasis, leishmaniasis, filariasis), are endemic in the region. A six month, part time Diploma in Tropical Medicine and Hygiene (DTM&H) course was established in the Sultan Qaboos University, Muscat, Sultanate of Oman, in 1997, for small g...

A new method of DTM construction based on quadrangular irregular networks (QINs) that considers all the original data points and has a topological matrix is presented. A numerical test and a real-world example are used to comparatively analyse the accuracy of QINs against classical interpolation methods and other DTM representation methods, including SPLINE, KRIGING and triangulated irregular n...

In general, the scene change for video indexing could be detected by using an appropriate threshold. However, the single fixed threshold value used in previous researches cannot perform well for all videos equally. In this paper, we propose a dynamic threshold method(DTM) in order to improve the performance of the scene change detection. The proposed method utilizes variable parameters obtained...

Building a digital terrain model (DTM) from LiDAR data can successfully be performed using a few techniques, but the quality of the resulted model and the way the terrain information is handled during the processing phase remain a challenge. A new framework for creating a DTM from LiDAR data within ArcGIS ® utilizes the new ESRI data structure known as Terrain Data Set (TDS). This article prese...