INTRODUCTION Ureteral access sheaths (UAS) facilitate flexible ureteroscopy in the treatment of urolithiasis. The physical properties of UAS vary by manufacturer and model. We compared three new UAS: Glideway (GW, Terumo, 11/13Fr, 12/14Fr), Pathway (PW, Terumo 12/14F) and Navigator HD (NHD, Boston Scientific, 11/13Fr, 12/14Fr) in the domains of safety characteristics, positioning characteristic...

This paper aims to investigate the buckling and post-buckling analyses of composite cellular beams. For this, numerical model is calibrated by experimental tests via analysis. A parametric study developed, considering six cross sections. each section, opening diameter web post length are varied. Regarding for symmetrical sections, it was concluded that end an important parameter in strength bea...

For a market with an atomless continuum of assets, we formulate the intuitive idea of a ‘‘well-diversified’’ portfolio, and present a notion of ‘‘exact arbitrage’’, strictly weaker than the more conventional notion of ‘‘asymptotic arbitrage’’, and necessary and sufficient for the validity of an APT pricing formula. Our formula involves ‘‘essential’’ risk, one based on a specific index portfolio...

The study aims to further standardize the construction process, improve quality, and ensure stability of infrastructure construction. continuous rigid-frame bridge is taken as research object, finite element model body established by using beam element, overall analyzed in completion stages. Moreover, coefficient buckling mode are under different working conditions each stage, linear variation ...

In this article, an exact analysis of compressors spool in a turbojet engine has been investigated. The spool is modeled as a rotating thick-walled hollow circular cylinder with free-clamp ends. It is subjected to centrifugal load due to its constant rotational speed, uniform internal and external radial loads and arbitrary thermal gradients. The analysis is initially investigated for the homog...

We study the compression of viscous filaments at constant velocity. If slender enough, the filament bends, a viscous analogue of Euler elastic buckling. We measure the characteristic time of this viscous buckling and discuss the link with the elastic critical compression. We show that the analogy only holds in the limit of large capillary numbers. Otherwise capillarity has a stabilizing effect,...

The buckling failure of the afterburner cylinder is a serious safety concern for aero-engines. To tackle this issue, simulation analysis was carried out by using finite element method (FEM) software to obtain mode and critical loads. It found that susceptible when subjected differential pressure or compressive force rear flange. Buckling would occur reached 0.4 times atmospheric axial on flange...

The Basic Document, Structural Safety, Steel of the Spanish Technical Building Code provides mathematical expressions to obtain lateral buckling resistance hot-rolled steel beams. These include a coefficient, {\displaystyle C_{1}}, that accounts for variation bending moment along beam. However, this document only values linear diagrams moments. instruction Steel, copy latest version Eurocode 3,...

the spline finite strip method (s.f.s.m.) for buckling analysis of plates and plate assemblies subjected to longitudinal compression and bending, transverse compression as well as shear is described. the method allows for the boundary conditions. local buckling coefficients of plates with different boundary conditions under compression, bending and shear are calculated. convergence studies with...