A microtubule (MT) is a hollow tube of approximately 25 nm diameter. The two ends of the tube are dissimilar and are designated as ‘plus’ and ‘minus’ ends. Motivated by the collective push and pull exerted by a bundle of MTs during chromosome segregation in a living cell, we have developed here a much simplified theoretical model of a bundle of parallel dynamic MTs. The plusend of all the MTs i...

To achieve an easily established, safe, and reproducible animal model for the study of heterotopic bone formation around vessels, a small animal series using New Zealand White rabbits was performed. Three different dosages of recombinant human bone morphogenic protein (rhBMP-2) carried by fibrin matrix were tested. A guided tissue regeneration (GTR) membrane sheet was formed into a tube and all...

In this paper we consider a rational eigenvalue problem governing the vibrations of a tube bundle immersed in an inviscid compressible fluid. Taking advantage of eigensolutions of appropriate sparse linear eigenproblems the large nonlinear eigenvalue problem is projected to a much smaller one which is solved by inverse iteration.

This article discusses a projection method for nonlinear eigenvalue problems. The subspace of approximants is constructed by a Jacobi–Davidson type approach, and the arising eigenproblems of small dimension are solved by safeguarded iteration. The method is applied to a rational eigenvalue problem governing the vibrations of tube bundle immersed in an inviscid compressible fluid.

We calculate the structural and electronic properties of an ordered ‘‘bundle’’ of ~10,10! carbon nanotubes. Our results indicate that intertube coupling causes an additional band dispersion of &0.2 eV and opens up a pseudogap of the same magnitude at EF . Soft librations at n'12 cm 21 are predicted to occur below the orientational melting temperature which marks the onset of tube rotations abou...

The paper presents a survey of the experimental and numerical studies shell-and-tube systems in which phase change material (PCM) is used. Due to multitude design solutions for systems, emphasis placed on double-tube (DT), triplex-tube (TT), multi-tube (MT) units. Additionally, only single-pass are considered. Particular attention paid method heat transfer intensification. analysis research res...