Ship's Locker: Out of the Closet

Discuss the Traveller RPG and its many settings
Condottiere
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Re: Ship's Locker: Out of the Closet

Postby Condottiere » Sat Sep 15, 2018 12:10 am

Why we need all-new space suits to survive Mars

https://www.youtube.com/watch?v=x6yyjmcfp_U

Not all space suits are created equal! Verge space reporter Loren Grush tries on a prototype suit that’s custom-made for survival on the Moon, and a totally different model for Mars. It isn’t easy.
legozhodani
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Re: Ship's Locker: Out of the Closet

Postby legozhodani » Sat Sep 15, 2018 8:47 am

Cool vid, thanks.
Condottiere
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Re: Ship's Locker: Out of the Closet

Postby Condottiere » Sat Sep 22, 2018 4:54 am

Atomic Radio will be with us soon: Nick Farrell

Image

Will still only play Taylor Swift and other junk

Boffins are close to shaking up wi-fi and broadcasting with the development of atomic radio thanks to the development of a new type of antenna capable of receiving signals across a much wider range of frequencies (more than four octaves) that is highly resistant to electromagnetic interference.

Antennas are typically a collection of metal rods that pick up passing radio waves and convert their energy into an electrical current, which is then amplified. According to David Anderson of Rydberg Technologies, those antennae are wavelength-dependent, so their size depends on whatever wavelength of signal they are trying to measure - they need to be about half the size of whatever wavelength they are designed to receive. That means you need antennae of several different sizes to measure different radio frequencies.

According to Technology Review Anderson has penned a new paper which suggests a novel alternative to conventional antennae, based on vapourcells filled with a gas of so-called "Rydberg atoms." That just means the atoms are in an especially excited state, well above their ground (lowest-energy) state.

This makes them especially sensitive to passing electric fields, like the alternating fields of radio waves. All you need is a means of detecting those interactions to turn them into quantum sensors.

"You can design the receiver to operate at whatever frequencies you want and avoid intentional electromagnetic interference much more easily."

His team worked out that it could zap vapor cells filled with excited cesium atoms with laser light tuned to just the right critical frequency. This saturates the atoms so they can't absorb any more light, such that a second laser beam can pass right through them, effectively making the gas transparent. The critical frequency at which this transition happens will change in response to a passing radio wave, so the light from that second laser beam will flicker in response. The vapor cell becomes a purely optical radio wave detector, with no need for any wires or circuitry.

The team has already tested the concept with AM and FM microwaves to transmit recordings of various team members singing "Mary Had a Little Lamb"—a nod to Thomas Edison, who sang the same song when he invented the phonograph in 1877.

The all-optical nature of the vapor cells means that even if they are hit with a massive burst of electromagnetic radiation, like that from a solar flare, they won't be permanently damaged because there is no circuitry.

The detector cells are quite small, merely millimeters in size, with the potential to scale them down even more. However, they require a significant backup system to operate, which has not been miniaturized. "You're not going to have a radio receiver that fits into a car dashboard today", said Anderson.

Within the next couple of years, he is confident they will have a suitcase-sized system that would fit neatly into an airplane or a ship, for example—vessels that would welcome the added protection from interference and electromagnetic pulses conferred by these detector cells.

https://www.fudzilla.com/news/47231-ato ... th-us-soon


Radios probably can be improved by three technological levels.
Condottiere
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Re: Ship's Locker: Out of the Closet

Postby Condottiere » Fri Sep 28, 2018 5:50 am

How to Succeed with Brunettes 1967 US Navy Dating Etiquette Training Film MN-10283C

https://www.youtube.com/watch?v=rAuwpUfObcI


How to interact with those groupies that your navy uniform attracts, and your chain of command when you're off the clock.
Condottiere
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Re: Ship's Locker: Out of the Closet

Postby Condottiere » Fri Sep 28, 2018 11:51 pm

World War II bombings weakened upper atmosphere at edge of space


The Earth's electrified upper atmosphere (the ionosphere) experiences a lot of natural variation, changing with the days and from season to season. The ionosphere can also be affected by certain big events, including solar flares, volcanic eruptions, lightning—and the massive bombs dropped on Germany during World War II. Those bombings produced shockwaves strong enough to weaken the ionosphere right near the edge of space.

That's the conclusion of a new study by University of Reading researchers, just published in the journal Annales Geophysicae. More than a historic curiosity, the finding matters because ionospheric disturbances can disrupt key communications technology, including GPS systems, radio telescopes, and radio communications...

“Aircrew involved in the raids reported having their aircraft damaged by the bomb shockwaves, despite being above the recommended height," says co-author and historian Patrick Major. "Residents under the bombs would routinely recall being thrown through the air by the pressure waves of air mines exploding, and window casements and doors would be blown off their hinges. There were even rumours that wrapping wet towels around the face might save those in shelters from having their lungs collapsed by blast waves, which would leave victims otherwise externally untouched.”

The effects also apparently spread throughout the atmosphere. The ionosphere is composed of three different ionized regions within the Earth's various atmospheric layers (the upper mesosphere and the lower and upper thermosphere, specifically). This means they have a significantly higher density of electrically charged atoms and molecules than the surrounding regions. This happens because the Sun's high-energy X-rays and ultraviolet rays collide with atoms and molecules in the atmosphere with sufficient energy to knock off electrons, thereby creating ions (atoms and molecules with missing electrons) and free electrons.

https://www.youtube.com/watch?time_cont ... OVz5x6RqR4

https://arstechnica.com/science/2018/09 ... -of-space/
Linwood
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Re: Ship's Locker: Out of the Closet

Postby Linwood » Sat Sep 29, 2018 10:52 pm

Talk about unintended consequences....

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