We give a Dehn-Nielsen type theorem for the homology cobordism group of homology cylinders by considering its action on the acyclic closure, which was defined by Levine in [13] and [14], of a free group. Then we construct an additive invariant of those homology cylinders which act on the acyclic closure trivially. We also describe some tools to study the automorphism group of the acyclic closur...

• Small cylinders endure longer lives under fatigue loading. The maximum pore size is larger in taller cylinders, which conditions their lower performance. A wall effect induces an inverse monotonic static effect. Cylinders fewer cycles than cubes of comparable size. law Sparks and Menzies insensitive to cylinder This study deals with the influence fiber concrete mesostructure on compressive Fo...

The steady flow of an electrically conducting, incompressible micropolar fluid in a narrow gap between two concentric rotating vertical cylinders, with porous lining on inside of outer cylinder, under an imposed axial magnetic field is studied. Beavers and Joseph slip condition is taken at the porous lining boundary. The velocity profiles, coefficient of skin friction on the cylinders are calcu...

Optimization algorithms for the design of mold temperature control systems based on deep-hole bores have to assure that the minimal distances between the bores meet given safety margins. If the bores are geometrically modeled as cylinders, this leads to the necessity of determining the minimal Euclidean distances between cylinders and testing them against the corresponding margins. In this pape...

Experimental measurements of acoustic transmission through a solid-solid two-dimensional binary-composite medium constituted of a triangular array of parallel circular steel cylinders in an epoxy matrix are reported. Attention is restricted to propagation of elastic waves perpendicular to the cylinders. Measured transmitted spectra demonstrate the existence of absolute stop bands, i.e., band ga...

Topological insulators (TIs) exhibit many exotic properties. In particular, a topological magneto-electric (TME) effect, quantized in units of the fine structure constant, exists in TIs. Here, we theoretically study the scattering properties of electromagnetic waves by TI circular cylinders particularly in the Rayleigh scattering limit. Compared with ordinary dielectric cylinders, the scatterin...

This paper deals with the elastic stresses of internally or externally pressurized long thick-walled composite cylinders fixed ends. Cylinders are made unidirectionally aligned transversely isotropic fibers and matrix. Axial radial fiber alignments considered, analytical solutions derived accordingly. Effects direction volume fraction alteration on limit analyzed. It is observed for both intern...

We take steps toward constructing explicit solutions that describe non-extremal charged dilatonic branes of string/M-theory with a transverse circle. Using a new coordinate system we find an ansatz for the solutions with only one unknown function. We show that this function is independent of the charge and our ansatz can therefore also be used to construct neutral black holes on cylinders and n...

Axisymmetrical stresses in an infinitely long hollow isotropic circular cylinder (plane strain) quickly approach their asymptotic values as the external radius increases. This is not the case if the cylinder is even slightly anisotropic -asymptotic solutions (for an infinitely large external radius) do not exist. We find the mechanical meaning of this disparity by using formulas for radial and ...