Globalisation and the state Doornbos, Martin; Seethi, K M; Seth, Sanjay ...
Indian journal of political science,
09/2001, Volume:
62, Issue:
3
Journal Article
Window happens to be the most critical and vulnerable component in high-power gyrotrons. For the first Indian gyrotron window, a face cooled double sapphire disc structure has been decided for ...delivering 200 kW power at 42 GHz. Development of sapphire machining and techniques for its UHV grade joining to metals are the major achievements so far. Optimisation of electrical and thermal parameters is in progress.
Viscous fingers have been produced in the lifting Hele-Shaw cell, with
concentric circular grooves etched onto the lower plate. The invading fluid
(air) enters the defending newtonian fluid - olive ...oil as fingers proceeding
radially inwards towards the centre. The fingers are interrupted at the
circular groove, and reform as secondary fingers. The effect of the grooves is
to speed up the fingering process considerably and the fingers now reach the
centre much faster. We explain this by comparing the variation in velocity of
the fingers in the normal HS cell and the grooved cells with time. In the
normal HS cell the fingers move fastest on initial formation and slow down
later. Since in case of the grooved plate, the fingers reform and receive a
boost in their speed each time they encounter a groove, the fingers proceed to
the centre faster. PACS nos. 47.20.Gv, 47.54.+r, 68.03.-g
Viscous fingers have been produced in the lifting Hele-Shaw cell, with concentric circular grooves etched onto the lower plate. The invading fluid (air) enters the defending newtonian fluid - olive ...oil as fingers proceeding radially inwards towards the centre. The fingers are interrupted at the circular groove, and reform as secondary fingers. The effect of the grooves is to speed up the fingering process considerably and the fingers now reach the centre much faster. We explain this by comparing the variation in velocity of the fingers in the normal HS cell and the grooved cells with time. In the normal HS cell the fingers move fastest on initial formation and slow down later. Since in case of the grooved plate, the fingers reform and receive a boost in their speed each time they encounter a groove, the fingers proceed to the centre faster. PACS nos. 47.20.Gv, 47.54.+r, 68.03.-g
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