The tubed vortex reducer in the axial compressor can destroy disk cavity, by a thin-walled tube, to reduce total pressure loss. tube may suffer from vibration problems, such as flutter and forced vibration, which are closely related aerodynamic damping. In this paper, energy method influence coefficient used study damping of tube. Based on modal characteristics, steady unsteady flow characteris...

Spin-polarized density functional theory is used to investigate hydrogen-induced magnetism in single-walled carbon nanotubes SWNTs . Hydrogen trapped at a carbon vacancy can trigger delocalized electron spin polarization on semiconducting zigzag SWNTs. Hydrogen pinned by a carbon adatom on the surface of the SWNT can induce spin polarization localized at the carbon adatom, independent of the di...

We report the nanoscale loading and confinement of aquated Gd3+n-ion clusters within ultra-short single-walled carbon nanotubes (US-tubes); these Gd3+n@US-tube species are linear superparamagnetic molecular magnets with Magnetic Resonance Imaging (MRI) efficacies 40 to 90 times larger than any Gd3+-based contrast agent (CA) in current clinical use.

The propagation of small-amplitude waves in a thick-walled long viscoelastic tube of variable cross-section, filled with a viscous incompressible fluid, is considered with account for wave reflection at the tube end in application to arterial pulse wave propagation. A solution is obtained in the form of expansions in a small parameter. The effect of the coefficient of wave reflection at the tub...

Formation of the ventricular system begins at the time the neural groove closes to form a neural tube. Fluid is present within the tube, even before the choroid plexus anlage appears. This fluid serves as a structural support for the tube, as well as a pathway for diffusion of metabolites prior to the formation of blood vessels. In the small, thin-walled fetal brain, fluid movement is character...

The dynamics of excitons in individual semiconducting single-walled carbon nanotubes was studied using time-resolved photoluminescence (PL) spectroscopy. The PL decay from tubes of the same (n,m) type was found to be monoexponential, however, with lifetimes varying between less than 20 and 200 ps from tube to tube. Competition of nonradiative decay of excitons is facilitated by a thermally acti...

Carbon nanotubes are chiral molecular objects and therefore exist in two forms that are each other’s mirror image. Many aspects of these fascinating new materials have recently been explored but their chirality has hardly been addressed. We have investigated the charge transport through individual single-walled carbon nanotubes in the presence of a magnetic field parallel to the tube axis. For ...

Tube flaring process involves a conical tool of certain length which is displaced to get an end flared tube, utilized form tight seal between pipes or tubes. refers kind forging often cold working operation. The tube forming widely used in several industries condenser pipes, car seat structures, exhaust piping, etc. Thin-walled tubes were automobiles reduce the total weight for better performan...

Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles ...

Energy absorber systems like metallic dampers for controlling the structural vibrations due to earthquake have witnessed considerable development in the past few decades. Also there are some studies on the energy absorption of thin-walled tubes due to impact load. Thin-walled tubes have a large deformation capacity and are suitable energy absorbers in the structure during an earthquake provided...