axial vibration effect of shell particles on dynamic stability of a cantilevered cylindrical shell under an axial follower force was addressed. in spite of free-ended shells, the reduced axial force under this effect cannot be derived analytically. instead, an approximate method was proposed based on the fact that the static (and harmonic) axial deformation under an axial load in a free-ended b...

At the very early Universe the matter fields are described by the GUT models in curved space-time. At high energies these fields are asymptotically free and conformally coupled to external metric. The only possible quantum effect is the appearance of the conformal anomaly, which leads to the propagation of the new degree of freedom-conformal factor. Simultaneously with the expansion of the Univ...

Mohammed Abu-Hilal Department of Mechanical and Industrial Engineering, Applied Science Private University Amman 11931 JORDAN Received: 04/01/2006 Accepted: 03/04/2006 Abu-Hilal , Mohammed 2007 Amplification Factors of Beams with General Boundary Conditions Due to a Moving Constant Load J. J. Appl. Sci Abstract: In this paper the amplification factors of an Euler-Bernoulli beam with different b...

The mechanism for the relaxation of the cosmological constant is studied and elaborated. In the model used for the analysis of the relaxation mechanism the universe contains two components: a cosmological constant of an arbitrary size and sign and a component with an inhomogeneous equation of state. Owing to the dynamics of the second component the universe asymptotically tends to a de Sitter p...

Positive vacuum energy together with extra dimensions of space imply that our fourdimensional Universe is unstable, generically to decompactification of the extra dimensions. Either quantum tunneling or thermal fluctuations carry one past a barrier into the decompactifying regime. We give an overview of this process, and examine the subsequent expansion into the higher-dimensional geometry. Thi...

We determine an expression ξs g(γ) for the virtual Euler characteristics of the moduli spaces of s-pointed real (γ = 1/2) and complex (γ = 1) algebraic curves. In particular, for the space of real curves of genus g with a fixed point free involution, we find that the Euler characteristic is (−2)s−1(1−2g−1)(g+s−2)!Bg/g! where Bg is the gth Bernoulli number. This complements the result of Harer a...