Macrocystis blades develop longitudinal corrugations in regions with strong current and wave action. This study examined the effect of corrugations on blade motion and blade drag by constructing flexible blades with different corrugation amplitude and a control blade with no corrugation. The models were designed to be dynamically and geometrically similar to natural blades. Acrylic molds were e...

The present research investigates the torsional aeroelasticity of the blade of an H-type vertical axis wind turbine subject to stall and post-stall conditions in various Reynolds regimes, which is experienced by the blade in a full revolution. In order to simulate the aerodynamics, a new model based on a combination of the Double Multi Streamtubes (DMST) model and the nonlinear multi-criteria C...

The main purpose of this article is the structural analysis of a composite blade of a selected helicopter. In this study, the stresses on rotors' blades caused by centrifugal forces, lift, drag and torque are analyzed. The governing equations of the structure behavior and solving processes were carried out by MATLAB software, and simulation is carried out by ABAQUS software, and they are compar...

Planar cell polarity (PCP) proteins form polarized cortical domains that govern polarity of external structures such as hairs and cilia in both vertebrate and invertebrate epithelia. The mechanisms that globally orient planar polarity are not understood, and are investigated here in the Drosophila wing using a combination of experiment and theory. Planar polarity arises during growth and PCP do...

We created a model physical system to investigate the role of blade rigidity in setting forces and rates of mass exchange for a blade exposed to unsteady flow in a vortex street. Using a combination of experimental and theoretical investigations, we find that, broadly, both the forces and the mass exchange are higher for more flexible blades. Below a critical value of the dimensionless blade ri...

background tracheal intubation using storz’s c-mac d-bladetm videolaryngoscope is associated with difficult negotiation of the tracheal tube into the glottis due to steep angulation of its blade. objectives in this study, we hypothesized that truflextm articulating stylet with its ability to dynamically tailor the ett shape to patients’ oropharyngeal anatomy would be better suited to the d-blad...

In reference to our recent paper (1), Melillo (2) makes three claims: (i) the adult WoransoMille (KSD-VP-1/1) scapula, which we did not consider in our analyses, suggests Australopithecus afarensis shoulders may be more derived than we report; (ii) our reconstructions indicate homoplasy, consistent with an “ape convergence” model; and (iii) Australopithecus shoulder shape is best explained by “...

The first thing we could see about throwing sticks1 is their curved shapes. Though, even if their curved shape stabilise their flight by lowering their center of gravity, this seeming parameter isn't the only one to govern their trajectory. Others parameters, like their airfoil cross section, blade wideness, thickness, surface, and mass are also decisive. One another parameter less studied in d...