Some Bianchi type I cosmological models of the universe with time dependent gauge function β for viscous fluid distribution within the framework of Lyra geometry are investigated in which the expansion is considered only in two dimensions i.e. one of the Hubble parameter (H1 = Ȧ A) is zero. To get the deterministic solutions of Einstein’s modified field equations, the viscosity coefficient of b...

The Diffraction coefficient for electromagnetic waves incident obliquely incident on a curved edge formed by perfectly conducting plane surfaces. This diffraction coefficient remains valid in the transition region adjacent to shadow and reflection boundaries where the diffraction coefficients of Keller’s original theory fail. Our method is proposed on Keller’s method of the canonical problem, w...

The elastic, piezoelectric, and dielectric constants of 0.67Pb~Mg1/3Nb2/3!O3–0.33PbTiO3 domain engineered single crystal were determined experimentally by using ultrasonic and resonance methods. It was confirmed that the single crystal system has large electromechanical coupling coefficient k33 ~;94%! and piezoelectric constant d33 ~;2800 pC/N! if the poling is done along the @001# of pseudocub...

Simplified procedures are commonly employed to estimate seismic displacements of earth and waste fills. The landmark work of Makdisi and Seed (1978) has been widely adopted in practice. Although this work is widely used, it has a number of significant limitations such as decoupling the sliding block analysis from the seismic response analysis, use of a limited number of recorded earthquake moti...

recent developments in nanostructured products draw considerable attention to ultrafine grained materials. these materials are normally manufactured by different severe plastic deformation (spd) methods. in the present study, analytical models and finite element method (fem) are used to calculate strain imposed to a specimen that was deformed by equal channel angular pressing (ecap). in additio...

At present, the mechanical properties analysis method of prefabricated shear wall structure based on static test is low overall simulation precision. In this paper, finite element used to analyze force performance structure. Based concrete material, elastic modulus, Poisson ratio, open fracture, transfer coefficients and closed tensile strength parameters, model established by ANSYS. The vertic...