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Thin Film Dome Protects Cities From Nuclear Blasts

How is it possible that a thin film dome could protect a city from harm in the event of nuclear attack? Read on.


(Cheap Method for Shielding a City from Rocket
and Nuclear Warhead Impacts
)

His idea is a thin dome covering a city with that is a very transparent film 2 (Fig.1). The film has thickness 0.05 0.3 mm. One is located at high altitude (5 - 20 km). The film is supported at this altitude by a small additional air pressure produced by ground ventilators. That is connected to Earth's ground by managed cables 3. The film may have a controlled transparency option. The system can have the second lower film 6 with controlled reflectivity, a further option.

The offered protection defends in the following way. The smallest space warhead has a minimum cross-section area 1 m2 and a huge speed 3 5 km/s. The warhead gets a blow and overload from film (mass about 0.5 kg). This overload is 500 1500g and destroys the warhead (see computation below). Warhead also gets an overpowering blow from 2 -5 (every mass is 0.5 - 1 kg) of the strong stones. Relative (about warhead) kinetic energy of every stone is about 8 millions of Joules! (It is in 2-3 more than energy of 1 kg explosive!). The film destroys the high speed warhead (aircraft, bomber, wing missile) especially if the film will be armored by stone...


(Cheap Method for Shielding a City from Rocket
and Nuclear Warhead Impacts
)

Regular Technovelgy readers might be thinking of the long history of science-fictional domes, like the glass dome described in A Modern Utopia (1905) by H.G. Wells or the moon dome described in Brigands of the Moon by Ray Cummings, published by Astounding Stories of Super Science magazine in 1930.

However, I was thinking of the roofed valley from Misfit, written by Robert Heinlein in 1939. In the story, a valley on an asteroid is selected for habitation. It is fitted with a "roof":

The Captain selected a little bowl-shaped depression in the hills, some thousand feet long and half as broad, in which to establish a permanent camp. This was to be roofed over, sealed, and an atmosphere provided...

"Is this roof going to be just fifty feet high?"

"No, it will average maybe a hundred. It bellies up in the middle from the air pressure..."

Libby concentrated for an instant, then looked puzzled. "But look -- This valley is a thousand feet long and better than five hundred wide. At half of fifteen pounds per square inch, and allowing for the arch of the roof, that's a load of one and an eighth billion pounds. What fabric can take that kind of a load?"

"Cobwebs."

"Cobwebs?"

"Yeah, cobwebs. Strongest stuff in the world, stronger than the best steel. Synthetic spider silk. This gauge we're using for the roof has a tensile strength of four thousand pounds a running inch."

Don't miss these dome-related stories; Glass Dome Cities On Mars, Dreamed By Elon Musk and Space Domes Over-rated? Science Fiction Authors Have Answers.

Thanks to Dr. Rachel Pawling for posting about this study.

Scroll down for more stories in the same category. (Story submitted 11/1/2022)

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Related News Stories - (" Engineering ")

Thin Film Dome Protects Cities From Nuclear Blasts
'What fabric can take that kind of a load? Synthetic spider silk.' - Robert Heinlein, 1939.

Cyborg Eye Flashlight Lights Up The Room
'Foyle pressed a tooth with his tongue and the peripheral cells of his retina were excited into emitting a soft light.' - Alfred Bester, 1956.

Aeromine Technologies Rooftop Wind Energy
'...a windmill on his roof for light and heat.' - John Jacob Astor IV, 1894.

Roomba Hoovers Up More Than Dirt
'He had brought that tiny instrument to map their movements.' - Jack Williamson, 1936.

 

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