Evidence for modified electronic structure in double-walled carbon nanotubes with respect to their individual inner and outer constituent single-walled nanotubes is provided by scanning tunneling microscopy and spectroscopy experiments. The contribution originating from the inner tube to the local density of states of the double-walled system was identified in agreement with previous theoretica...

INTRODUCTION Tracheostomy is a common airway procedure for life support. The fracture of the tracheostomy tube is a rare complication. We report a case of a 14-year-old boy whose fractured stainless steel tracheostomy tube dislodged into the tracheobronchial tree. We include a literature review and proposed recommendations for tracheostomy care. CASE PRESENTATION A 14-year-old Thai boy who ha...

The inner tube layer of Pomatoceros americanus has a complex oriented ultrastructure, which cannot be explained by the standard granular secretion model, predicting a largely unoriented structure of the tube. In the lamello-fibrillar structure of the inner tube layer, the crystallization axis of crystals has a uniform orientation, which is not continuous through successive growth increments. Th...

Abstract Viscous flow between two sinusoidally deforming curved concentric tubes is mathematically investigated for the first time. Exact solutions are computed to analyse these and graphical outcomes included a thorough analysis of solutions. The present article has prime applications in endoscopy as novel peristaltic endoscope introduced time sinusoidal tube. This nature outer tube with flexi...

INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY Peristaltic Transport of a Conducting Jeffrey Fluid in a Vertical Annulus K.Komala, S. Sreenadh, A.N.S.Sreenivas Department of Mathematics, S.V.College of Engg. & Technology, Chittoor, India Department of Mathematics,Sri Venkateswara University, Tirupati, India School of Advanced Sciences,VIT University,Vellore, India profsreen...

A theoretical investigation has been made of the attenuation and lag of an oscillatory pressure variation applied to one end of a tube, when the other end is connected to a pressuresensitive element. An elementary theory based on incompressible viscous-fluid flow is first developed. The elementary solution is then modified to take into account compressibility; finite pressure amplitudes; apprec...

BACKGROUND Advancements in tracheostomy tube design now provide clinicians with a range of options to facilitate communication for individuals receiving ventilator assistance through a cuffed tube. Little is known about the impact of these modern design features on resistance to air flow. METHODS We undertook a bench model test to measure pressure-flow characteristics and resistance of a rang...