Influence of convective cooling at the extrudate’s free surfaces on its own swelling behaviour is examined numerically when viscous fluids of a Newtonian type are extruded. In circular die extrusion, increasing the surface heat transfer coefficient h increases extrudate’s thickness swell at low Nahme-Griffith number Na; at high Na, however, this trend tends to be reversed. With annular dies, a ...

It has been recently proposed that the combined action of inertia and non-linear viscoelasticity may be the origin of very peculiar behaviors with dramatic changes of flow type. Two examples are the problem of delayed die swell and the orientation of elongated particles sedimenting in solutions of wormlike micelles. These solutions give rise to well defined viscoelastic properties which can be ...

-----------------------------------------------------------ABSTRACT----------------------------------------------------Dynamic Voltage Restorer (DVR) is used in power distribution system to protect sensitive loads in voltage disturbances. The performance of DVR is related to the adopted configuration and control strategy used for inverters. In this paper, matrix converter with reduced number of...

Quality of power has always been an area of interest and needs continuous improvement for transmission and distribution system. In this paper the power quality issues viz. sag and swell are being analysed for a distribution network. The effectiveness of DSTATCOM has been explored so that these above said power quality issues are mitigated up to a considerable extent. The behaviour of the device...

The use of sensitive electronic equipment has increased now a days which has lead to power quality problems. The various power quality disturbances are transients, interruptions, voltage sag, voltage swell, voltage collapse, harmonics etc. To solve these power quality problems various custom power devices are used. Dynamic voltage restorer (DVR) is a custom power device used for the Compensatio...

But Green's history of smoking a pack a day for 30 years and his doctor's insistence changed his mind. And when his low-dose CT scan (LDCT) identified an early stage tumor in his left lung, Green underwent surgery at Lahey Hospital & Medical Center, a teaching affiliate of the Tufts University School of Medicine, Burlington, Mass. He has been cancer-free since. “It wasn't so long ago that lung ...

This paper presents the results of element testing and centrifuge modelling to investigate behaviour piled foundations in swelling clays. The study revealed that preparation procedure implemented, was able retain key hydromechanical properties when compared with undisturbed specimens. Furthermore, method utilised create an artificially ‘fissured’ fabric allowed for significant swell magnitudes ...

Superporous hydrogels (SPHs) were originally developed as a novel drug delivery system to retain drugs in the gastric medium. These systems should instantly swell in the stomach and maintain their integrity in the harsh stomach environment, while releasing the pharmaceutical active ingredient. For years, the synthetic features and properties of these SPH materials have been modified and improve...

Abstract---In this paper we present a wavelet compression technique for power quality disturbance data. Power quality transient data are compressed and stored for analysis and classification purposes. Original data can be reconstructed and then analyzed using wavelet transform. Different power quality disturbances including voltage sag, swell, sag with harmonic and swell with harmonics are used...

This study is purposed with the preparation of polyacrylamide/Polypyrrole hydrogel composite, in which the hydrogel of crosslinked polyacrylamide is a matrix and Polypyrrole is an electro-conducting component. The effects of synthesis conditions on the structure of the composite systems, their ability to swell in water, and mechanical characteristics are studied. The proposed synthesis procedur...