Recent Articles in IJAERD
Comparison of Right-of-way in Mountainous and Valley Forest Roads
Author(s)- Mehran Nasiri
Abstract
The aesthetic quality of hyrcanian forest roadsides is influenced by a number of factors. Among these factors are right-of-way width, earth working (cut and fill slopes), adjacent land use, topography and existing vegetation. The main objectives of this study were to comparison of right-of-way in mountainous and valley forest roads. For this purpose, were measured real right of way and earth working limit using laser rangefinder and mapping index for each road. Results showed, there was significant difference between the earth working limit and real right of way in valley and mountainous forest roads (P< 0.05). Also, was found significant linear relationship, with equation of Y = 0.249X + 2.202 (R² = 0.69) between range slope and real right of way in mountainous forest road. The rate of earth working limit and real right of way increased with increasing range slope. Horizontal curve radius has an important effect on geometric design of road. So that, the rate of earth work limit decreased with increasing horizontal curve radius. Also, there was a significant linear relationship between horizontal curve radius and real right of way in mountainous (R² = 0.65) and valley (R² = 0.49) forest roads. According to results, right of way and earth working limit should be carefully selected, not only to minimize the total road cost but also to reduce the environmental impact and to improve driver safety.
Thermal Convection in Walters’ (Model B‘) Rotating Fluid Permeated With Suspended Particles and Variable Gravity Field in Porous Medium in Hydromagnetics
Author(s)-Sharma V, Rana G.C
Abstract
The thermal convection in Walters’ (Model B’) elastico-viscous rotating fluid permitted with suspended particles (fine dust) and variable gravity field in porous medium in hydromagnetics is considered. By applying normal mode analysis method, the dispersion relation has been derived and solved numerically. For stationary convection, Walters’ (Model 
) elastico-viscous fluid behaves like an ordinary Newtonian fluid and it is observed the rotation has stabilizing effect and suspended particles are found to have destabilizing effect on the system, whereas the medium permeability has stabilizing or destabilizing effect on the system under certain conditions. The magnetic field has destabilizing effect in the absence of rotation, whereas in the presence of rotation, magnetic field has stabilizing or destabilizing effect under certain conditions. The effect of rotation, suspended particles, magnetic field and medium permeability has also been shown graphically. It is observed that the rotation, magnetic field, gravity field, suspended particles and viscoelasticity introduce oscillatory modes.
