Iris Publishers Journal Of Engineering Sciences

  Research Challenges for Nigerian Road Transportation Sector in Covid-19 Pandemic Era Authored by Danladi Slim Matawal   Introduction The growing number of studies on the impact of COVID-19 is often chosen in the context of developed countries, highlighting a gap in the understanding of how the pandemic is impacting developing countries. There is need to acknowledge the effect/ impact on transportation in emerging economies where lockdowns and restrictions on movement may not be wholly ineffective but even more suited to the level of psychological response of the people. There is not just poor transportation infrastructure but also lack of a clearly defined transportation system that is effectively managed and regulated by operators while the economy is largely informal. The outbreak of the COVID-19 coronavirus was deemed a pandemic by the World Health Organization (WHO) on 11th March 2020. To date, there have been cases confirmed in at least 203 countries, areas or territ...

  On Computational Modeling and Analysis of Transonic Aerodynamics Authored by Jun Yu Introduction There has been considerable amount of researches conducted on the studies of transonic aerodynamics due to its use in airplane wing design. Using a general theory of expansion procedures, transonic flow past slender bodies and thin wings is investigated [1]. Asymptotic expansions with appropriate limiting procedures reduce the full equations to an approximation involving the steady transonic small-disturbance (TSD) equation. Expansion procedures of thin airfoil theory at various Mach numbers can be found in Section 5.3 of [2]. The TSD equation is mathematically interesting as the freestream Mach number approaching to unity it becomes a partial differential equation of mixed type (elliptic and hyperbolic). This creates a challenge for obtaining solution of the equation. There are several theoretical and computational methods based on the hodograph method. A series of interesting res...

The Contribution of Sedimentological Studies to River Engineering Projects in Khuzestan Province, Iran Authored by A Barjasteh Introduction Khuzestan Province in the southwest of Iran has the longest and largest rivers of the country (Figure 1). Accordingly, river engineering studies including sedimentological and geomorphological investigations are of especial concern in the province. Erosion and weathering of easily erodible geological formations particularly evaporitic ones in the region is a significant problem that could affect the projects. This is due to the impact of erosion on river morphology. However, most of these studies are concentrated on hydraulic aspects of sedimentation and little has been devoted to sedimentary geology of river sediments. In this regard some of the related projects related could not attain their forecasted aims. Geological Setting The Zagros Fold Belt in the northeast of the Persian Gulf is a branch of the Alpine-Himalayan Orogenic belt divide...