Labyrinth seals are used in turbo-machinery for reducing the leakage of working fluid. The energy lost by the fluid passing through the gap between labyrinth seal and rotor causes the reduction in leakage rate. But the fluid in between the labyrinth seal and rotor induce various forces (radial and tangential forces). These forces can be represented by certain numbers of coefficients, such as st...

Gate-leakage reduction is the key motivation for the replacement of SiO2 with alternative gate dielectrics. 45nm gate length scaled grooved and bulk nMOSFETs are evaluated to bring out the most compatible and power saving dielectric option using Si3N4 and SiO2 using Silvaco ATLAS device simulator. At the scaled thickness, SiO2 controls the leakage better than Si3N4, whereas at increased thickne...

Introduction: Grooved terrain on Ganymede records an episode of extensional tectonics and possibly cryovolcanism [1], but the cause of groove formation remains uncertain. With little evidence for surface contraction to balance out extension, various mechanisms have been proposed to increase the interior volume of Ganymede and thus cause global expansion. Global expansion may be caused by the in...

The reflection spectra of composite materials on a base of grooved silicon and grooved silicon infiltrated with nematic liquid crystal (LC) have been calculated using the optimal parameters of a grooved silicon matrix suitable for the infrared range. The grooved silicon structures with different lattice constants (A=16, 12, 8 and 4 μm) have been designed and prepared. An important parameter of ...

We show t than a flat one. Two d of strong magnetic fie Linear Collider Collaboration Tech Notes act This note documents a set of expressions used to explore the issue of whether or not it is reasonable to er a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the sion target and the comparison of the induced stress with the ultimate ten...

Grooved surfaces are effective to suppress the secondary electron emission, and can be a promising technique to mitigate the electron cloud effect in positron/proton storage rings. Aiming for the application in a dipole-type magnetic field, various shapes of triangular grooved surfaces have been studied at KEK. The grooves tested here have vertex angles of 20−30°, depths of 2.5−5.0 mm, and vert...

A numerical investigation of surface heat transfer characteristics of turbulent air flows in different parallel plate grooved channels is performed using CFD code. The results are obtained for Reynolds number ranging from 10,000 to 30,000 and for arc-shaped and rectangular grooved channels. The influence of different geometric parameters of dimples as well as the number of them and the geometri...

Introduction: Grooved terrain on Ganymede generally occurs as individual lanes and polygonal crosscutting swaths of bright terrain. Internally, grooved terrain swaths consist of parallel to sub-parallel ridges and troughs at a variety of scales (Fig. 1); the ridges and troughs show generally similar morphology, size, and orientation. Grooved terrain on Ganymede has been interpreted by most auth...