We consider slender languages, that is, languages for which the number of words of the same length is bounded from above by a constant. We prove that the slenderness problem is decidable for context-free languages and that the maximal number of words of the same length in a given context-free language is computable. Some e ective representations of slender context-free languages, as well as oth...

The present paper investigates the transverse vibration of a non-uniform axially functionally graded Timoshenko beam with cross-sectional and material properties varying in length direction. Chebyshev collocation method is used to spatially discretize governing partial differential equations motion into time-dependent ordinary terms differentiation matrices. An algebraic eigenvalue equation mat...

This paper describes an experimental program that deals with retrofitting of infill un-reinforced masonry walls (URM) with Fiber Reinforced Polymer (FRP). The primary objective of this research is to develop a retrofit strategy that while economical will minimize the influence of the retrofit on the overall performance of structural frames in predominant seismic regions. Allowing some damage to...

The stability and design of fixed-ended stainless steel equal-leg angle section members subjected to axial compression are studied herein. An experimental investigation, comprising material testing, initial geometric imperfection measurements tests on hot-rolled austenitic columns is first presented. test results, in combination with existing data collected from the literature, then used for va...

In a recent paper we introduced Parikh slender languages as a generalization of slender languages defined and studied by AndraSiu, Dassow, Pgun and Salomaa. Results concerning Pa&h slender languages can be applied in ambiguity proofs of context-free languages. In this paper an algorithm is presented for deciding whether or not a given context-free language is Parikh slender.

This paper introduces a procedure to model the dynamics of active slender structures with embedded actuators and sensors. The objective is to construct a loworder high-accuracy formulation for easy parameterization of the design space in nonlinear aeroelastic analysis. Main assumptions are small local strains and local rotations, large deflections and global rotations, quasielectrostatic behavi...

The concrete-filled double steel tube (CFDST) has been more and widely used in infrastructure due to its greater moment of inertia compared the ordinary (CFST). With increase collision accidents occurring recent years, research on CFDST under impact needs attention. To study dynamic responses columns lateral impact, finite element package ABAQUS was simulate force mid-span deflection column cou...

The grain shape and orientation distribution of metal sheets at mesoscales are usually irregular, which has an impact on the elastic properties materials. A function (GSF) is constructed to represent grains. expansion coefficient GSF basis Wigner D called coefficient. In this paper, we study influence average constitutive relation orthogonal polycrystalline materials, obtain a new expression ma...

This paper summarizes and discusses some critical aspects of flying hypersonically. The first is the L/D (lift over drag) ratio determining thrust that in turn depends on slenderness Küchemann’s τ parameter. second parameter found to depend relative importance wave versus friction drag. Ultimately, all engineering drag argued vorticity formed at expense vehicle kinetic energy, thus requiring wo...