The question of whether unobserved short-wavelength modes of the gravitational field can induce decoherence in the long-wavelength modes (“the decoherence of spacetime”) is addressed using a simplified model of perturbative general relativity, in which the metric is assumed to be conformally flat and the quantity of interest is the deviation from unity of some power of the conformal factor. For...

This study presents the design and implementation of a spatial H∞ controller for the active vibration control of a cantilevered smart beam. The smart beam consists of a passive aluminum beam (507x51x2mm) and eight symmetrically surface bonded SensorTech BM500 type PZT (Lead-Zirconate-Titanate) patches (25x20x0.5mm). PZT patches are used as actuators and a laser displacement sensor is used as se...

Non-Symmetrical Plastic Collapse Modes of a Symmetrically Loaded Circular Cylinder. P18stic collapse modes of a thick-walled homogeneous cylinder under circularly-symmetrical loading (internal and external normal pressures) are analyzed. Ideal plasticity, I-IUBEIt-~ISES-HENC]~Y yield condition, incompressibility and plane strain conditions are assumed. The possibility of existence of non-syrm~e...

We present a relational technique to write formal specifications which not only say what the system is intended to do but also in which ways it might misbehave because of damage or other failure. For this kind of specifications we use the term failure-sensitive. Specifications are given by sets of rules out of which a complete list of failure modes for the system can be constructed. Most classi...

This paper has introduced two kinds of combined hybrid variational formulations for plate bending finite elements based upon the Reissner–Mindlin theory, according to whether assumed constant moment stress is introduced when assumed constant shear stress has been introduced. Due to two options for incompatible displacement modes, four new types of combined hybrid elements are proposed. A set of...

This paper presents a new scheme of strain-constructed point interpolation method (SC-PIM) for static, free and forced vibration analysis of solids and structures using triangular cells. In the present scheme, displacement fields are assumed using shape functions created via the point interpolation method (PIM), which possess the Kronecker delta property facilitating the straightforward enforce...

one of the ways to be informed on the extent of activities in various industries is to measure the rate of nominal protection. this paper tries to calculate the nominal and effective protection in order to examine the exchange rate unification impacts on the protection of pulp and paper industries with the aim of performing the exchange rate unification policy. therefore, nominal protection rat...