AIM One of the most common problems with transpedicular screws is screw pullout. This study was conducted to measure the pullout strengths of newly designed transpedicular screws. MATERIAL AND METHODS The design of the three group screws were conical cored standard pedicle screw (Type A), dual threaded pedicle screw (Type B), dual core and dual threaded pedicle screw (Type C), respectively. P...

OBJECTIVES Fractures of the proximal femur are a common clinical problem, and a number of orthopaedic devices are available for the treatment of such fractures. The objective of this study was to assess the rotational stability, a common failure predictor, of three different rotational control design philosophies: a screw, a helical blade and a deployable crucifix. METHODS Devices were compar...

• Helical reinforcement screwed into fresh printed mortar has high mechanical interlock. Pull-out performance did not change when placed up to 200 min post deposition. is an effective way for reinforcing 3DCP structures. The incompatibility of 3D concrete printing (3DCP) with conventional methods well known. Recently, solutions have suggested the insertion helical rods through a screwing motion...

Helical pile foundations are a new foundation type for offshore wind power applications with high bearing capacity and good recovery that can be quickly easily constructed. In this study, the finite element method was used to simulate characteristics of helical after installation. For simulations, blade, deeply buried in single layer sand, selected. Through numerical vertical screw an ordinary ...

The handedness or chirality of molecules, organisms, and elementary particles has been widely appreciated, vindicating Pasteur’s perceptive generalization, “L‘univers est dissymktrique.” Ambidexterity is rare not only in biological organisms but also in molecules. One of the most striking chiral features in biopolymers is the twist or handedness of the helices that are frequently formed. Cylind...

The non-stationary heat transfer inside a cylindrical channel of shafted screw conveyor, electrically heated, and filled with moving biomass was analyzed. problem transport is encountered in the processes pyrolysis food products’ sterilization. To solve conduction equation initial boundary conditions, methods expansion given unknown functions into Fourier series angular coordinate, Laplace inte...