Tubular structural members with slender cross-sections are susceptible to failure through local buckling of their tube walls. Previous numerical studies steel elliptical hollow sections in compression predicted the modes and ultimate loads particularly specimens, results used calibrate design methods for sections. Although these parametric were conducted across a wide slenderness range, it was ...

We report on the investigation of the photon energy dependence of double 1s photoionization of light atoms and compare the cross sections for hollow atom and He-like ion production. Measurements of the Kα hypersatellite x-ray spectra of Mg, Al, and Si were carried out using the Fribourg high-resolution x-ray spectrometer installed at the ID21 and ID26 beam lines at the ESRF. The double-to-singl...

porous hollow glass microspheres have many uses, including encapsulation of active materials. in this paper a fast and facile method for fabricating porous hollow glass-microspheres was demonstrated by etching them using dilute hydrofluoric acid. then, a highly reactive amine was infiltrated into the etched glass microspheres. scanning electron microscopy was conducted for the hollow glass micr...

The chord length is an essential geometric property that must be defined in the analysis of isolated joints composed hollow steel sections, as well boundary conditions test. these parameters’ effect on behavior has been addressed by other studies, mostly with between circular sections compact or semi-compact cross-sections. Recent research about tubular cases slender where design containing sti...

A complete analysis of light propagation through a hollow coupling with a uniformly varying cross section and specularly reflecting walls is given. This enables one to relate the entrance and exit intensity distributions when the input is incoherent but collimated. Results indicate that the input aperture can be partitioned into sections characterized by the total number of reflections an incom...

We determine the different possible space-time metrics inside an infinite rotating hollow cylinder with given energy density and longitudinal and azimuthal stresses, the metric outside the cylinder being chosen of the spinning cosmic string type. The solutions we obtain for various domains of values of the cylinder parameters include a space-time with topologically Euclidean spatial sections, a...

Lactate dehydrogenase-elevating virus (LDV) was purified from culture fluid of infected primary cultures of various mouse tissues (peritoneal macrophage, bone marrow, spleen, and embryo) and from plasma of infected mice. Electron microscopy of negatively stained virus and positively stained sections of LDV revealed spherical particles of uniform size with a diameter of about 55 nm, containing a...