background: the aim of this study is to evaluate the long and short ten postoperative results after the notaras procedure as a surgical treatment of rectal prolapse in adults. methods: thirty-one patients suffering from rectal prolapse who were operated with notaras posterior mesh rectopexy in shohada-e-tajrish hospital between 1991- 2000 were followed up for results and complications and the r...

A near-field electrospinning (NFES) process has been developed to deposit solid nanofibers in a direct, continuous, and controllable manner. A tungsten electrode with tip diameter of 25 microm is used to construct nanofibers of 50-500 nm line width on silicon-based collectors while the liquid polymer solution is supplied in a manner analogous to that of a dip pen. The minimum applied bias volta...

A very thin liquid jets can be obtained using electric fields. The electrically-driven bending instability of the jet enormously increases the jet elongation path and effectively leads to its tinning by very large ratios and can be used to produce nanofibres. The mechanism of electro-thinning of liquid jets, discovered almost one century ago, is yet not fully understood. In the following study ...

Nanofiber-based nonwoven mats produced in electrospinning setups are usually very fragile, which often limits their applicability. Yarns have the potential to enable incorporation of nanofibers into other materials using well-established techniques such as sewing, knitting, weaving and embroidering, thus broadening application nanofibers. Here, we review development continuous yarn processes. A...

The following manuscript presents a comprehensive investigation regarding the influence of electrospinning parameters on fiber quality and mechanical properties nanofibrous poly(amino acid) meshes. At first, we examine including: solvent options, polymer concentrations, collector speed distance, voltage, needle sizes flow rates to prepare fibrous scaffolds based polysuccinimide. main objective ...

Electrospinning refers to the process of generating nanofibers from electrified viscous polymeric jets. Though relatively easy to perform, this process is quite complex in its nature, given the large number of parameters that are involved. This study attempts to derive a relation between the final fiber diameter and the major process parameters. Two new dimensionless numbers describing viscous ...

Electrospinning is based on so-called bending instability which results in an erratic spiralling motion of the liquid jet as it proceeds towards a collecting electrode, where it is eventually deposited as a mat of micro/nanosized fibres. Most electrospinning models formulated within the slender approximation rely, however, on an inconsistent description of electrostatic interactions which rende...