Dielectric elastomers represent today excellent materials for the realisation of electric field driven polymer actuators capable of high performances. A new kind of actuator made of dielectric elastomers, able to show in principle electrically activated linear contractions, is here theoretically described. The device consists of an elastomeric hollow cylinder, having two helical electrodes inte...

Microstrip antennas are conformable to planar and nonplanar surfaces, simple and inexpensive to fabricate using modern printed-circuit technology. Circular polarization of low-profile microstrip patch with high bandwidth is achieved in this research through the use of a three-cross-arms branch-line coupler with sequential rotated arrays, another low-profile antenna of hollow cylinder is also pr...

We report progress on a feasibility study of Proton Computed Tomography and Proton Transmission Radiography for applications in treatment planning and patient positioning for proton radiation therapy. We analyzed data from proton transmission studies through a hollow aluminum cylinder taken with a telescope of silicon detectors with very high spatial and good energy resolution. In addition, we ...

In this work, we study the influence of different parameters on the final microstructure of the part. For this we used a trial geometry which is formed of a kind of hollow cylinder with different widths. This variation of widths is interesting because it creates high shear rates in the part. The most common defects occurring during the forming are cracks and porosity. They are shown on Fig. 1. ...

n a recent paper [l], Van Blade1 discussed in detail the behavior I of fields j . ' and surface charges near singularities of metallic struc$res, such as a hollow circular cylinder, a circulai cone, a thin prolate spheroid, and a uniformly charged segment. At times, the reasoning in [I] leads to conclusions not as definitive as one might wish because of the various approximations introduced, su...

In this paper ,the general solution of steady-state one dimensional asymmetric thermal stresses and electrical and mechanical displacements of a hollow cylinder made of functionally graded material and piezoelectric layers is developed .The material properties ,except the Poisson's ration, are assumed to depend on the variable radius and they are expressed as power functions of radius. The temp...