Stargate Command used this technique themselves during a later incident to penetrate a "natural iris" that had formed over Edora 's Stargate after it had been hit by an asteroid and buried while still active.
Major Samantha Carter constructed her own particle accelerator and used it to save O'Neill, who had been trapped on Edora by the asteroid strike; the plasma weapon was able to create enough of a gap for Earth to dial the Edoran Stargate, creating a cavern above the now-buried gate via the 'kawoosh' effect that gave Teal'c enough space and oxygen to dig to the surface.
The Tollan possessed phase-shifting technology that allowed them to walk through solid matter, including Earth's iris. This technology was almost turned against Earth with the use of phase-shifting weapons , created on the orders of Tanith acting as the agent of Anubis after Anubis demonstrated his advanced defences against the Tollans' usual technological advantage, but the cache was destroyed before they could be put to use.
Certain types of dangerous energy can also pass through the iris. Closing the iris temporarily decreased the radiation in the gate room, but the iris would have overheated and melted had the Stargate not shut down at its minute limit. Anubis fired an Ancient energy weapon into the Earth Stargate which caused energy to build up in the naquadah, eventually overloading the gate's capacity and causing a massive explosion. The iris significantly reduced the rate of energy buildup, but couldn't stop it.
The Stragoth managed to breach the iris and establish a Foothold situation on the base by masquerading as SG They took over the base and started plans to take over the world.
Thanks to their encounters with the Goa'uld , Teal'c and Carter were immune to their technology. Carter managed to escape the base and get help. Most of the remaining aliens escaped through the Stargate and the rest self-destructed to prevent capture. Countermeasures were employed to negate any further attempts at intrusion by that unknown species.
SG1 : " Foothold ". Replicators once breached the iris by remotely hacking into the control system through an incoming wormhole and stormed the SGC, trying to get out of the base to infest Earth. The Asgard were also capable of doing this, though defenses were presumably employed against it following the capture of Thor by Anubis.
In a less harmful type of breach, Asgard holographic projectors are capable of bypassing the Stargate's iris, allowing the user to appear a short distance in front of the gate. The nanoscopic space between the shutters of the iris are enough for the holographic material to reintegrate. The Wraith were able to bypass the iris through the use of the Midway space station , which Stargate Command believed to be secure against intrusion and thus recognized automatically from the dialing sequence.
The clinical consequences include a smaller change in iris volume on pupil dilation in closed-angle eyes, thereby bringing the iris and trabecular meshwork closer in apposition. In this review, we summarise the potential role of the iris in the pathogenesis of angle closure disease. Keywords: angle closure; anterior chamber; glaucoma; iris; public health. No commercial re-use. All it really is, is a half-filled iris on one side of the actuator plane, and another half-filled iris on the other side.
And by having the blade arrays separate, they are free to move beyond the center of the iris without meshing into one-another — as they do in a single-plane iris — allowing the iris to close completely. Take a look at our article on making a quick cardboard mock-up version and blade making tips and tricks. The 2 slip blades shown mounted on top and mostly hidden underneath the actuator ring.
Left and right-handed blades.
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