One of the most important conflicts that shaft spillways have to deal with is vortex formation. This phenomenon leads to some unfavorable effects such as vibration in the body of structures, air entrainment and reduced overflow capacity of the spillway. Among all solutions for disrupted vortex formation, an innovative one called circular piano-key spillway, based upon piano key weir principles ...

In dry lands, semi-circular bund has been considered as a management practice used to restore the ecological revival in terms of vegetation enrichment and soil amelioration. This study was conducted to investigate the effects of semi-circular bunds on vegetation cover and some soil properties in Koteh rangeland, Sistan and Baloochestan province, Iran (2014). Adjacent to the semi-circular bund a...

in this paper, analysis of fluid flow and heat transfer over the bank of tubes is considered. k-ω sst model is applied for simulation of turbulent flow. in this paper, the improvement of efficiency of a bundle of circular tubes by changing the shape of the cross section of one row of the pipes to the elliptical cross section as an innovative plan is considered. as know, friction factor in turbu...

The current study deals with free vibration analysis of a sandwich beam in presence different cutouts. PVC foam and glass fiber were used for the core surface layers structures, respectively. First 6 frequencies structures determined cutout shapes to see effect on behavior structures. For this, beams but same area modeled. To cutouts-shape only shape cutouts was changed all other parameters kep...

The exploitation of yerba mate goes beyond economic issues, due to its insertion in a dynamic multidimensional territorial context. Therefore, the initial analysis construction occurs from relations object/subject study territory. plot inherent territory is marked by diversity subjects, elements and dynamics that compose territorialities, resulting complexity specific each clipping. This paper ...

background: stereotactic radiosurgery is an important clinical tool for the treatment of small lesions in the brain, including benign conditions, malignant and localized metastatic tumors. a dosimetry study was performed for elekta ‘synergy s ’ as a dedicated stereotactic radiosurgery unit, capable of generating circular radiation fields with diameters of 1-5 cm at isocentre using the beam/egs4...

This paper presents two methods to design cutouts that allow damage-free folding of the stiffest possible composite self-deployable thin shell structures complex shapes. The first method uses level-set functions define a general number cutouts. second spline representation contour single cutout and optimizes its shape. Material failure detection is implemented in solution. Both are applied depl...

Abstract This study carried out finite element dynamic analyses of carbon nanotubes/fiber/polymer composites (CNTFPC) with various geometries. In the first application, effects CNTs on nonlinear transient responses doubly curved shells for cutout sizes and curvatures are studied. The numerical results obtained in good agreement those reported by other investigators. For practical focus this is ...