Verrry interesting…but Shtupit!
I see how they work. First of all, 10db is not useful to the demographic that
typically enquires about sound deadening. But the main deterrent is the fact the head stays proud of the surface and exposed. We already have systems at very reasonable cost fara bette superior. This is definitely not a better mouse trap. :whazzat
I see how they work. First of all, 10db is not useful to the demographic that
typically enquires about sound deadening. But the main deterrent is the fact the head stays proud of the surface and exposed. We already have systems at very reasonable cost fara bette superior. This is definitely not a better mouse trap. :whazzat
so I’ll eat a bit of crow here. I thought there was a spacer below the top of the screw but it’s actually constructed like a drywall laminating
screw. However though it may be somewhat effective, it renders the drywall very fragile since it’s not held securely against the substrate. I definitely would not use it on a ceiling.
Nuclear-powered spaceships for fast trips to Mars may now be one step closer to reality.
NASA, DOE fund three nuclear thermal space propulsion concepts | Space
Nuclear thermal propulsion systems "would transfer the heat generated by a nuclear reactor to a liquid propellant such as hydrogen, which would then transition to the gas phase, expand and be funneled through a nozzle, creating thrust."
Not to be confused with the nuclear pulse propulsion of NASA's Project Orion in the 1950s which proposed propelling a spacecraft by detonating a series of atomic bombs behind the vehicle
NASA, DOE fund three nuclear thermal space propulsion concepts | Space
Nuclear thermal propulsion systems "would transfer the heat generated by a nuclear reactor to a liquid propellant such as hydrogen, which would then transition to the gas phase, expand and be funneled through a nozzle, creating thrust."
Not to be confused with the nuclear pulse propulsion of NASA's Project Orion in the 1950s which proposed propelling a spacecraft by detonating a series of atomic bombs behind the vehicle
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The neat thing about nuclear thermal propulsion is you can use just about anything for fuel (within reason).
I didn't know that the Hubble Space Telescope has been out of action for the past month after suffering a computer glitch.
Engineers have traced the fault to the Power Control Unit (PCU) and plan to start implementing a fix tomorrow (Thursday July 15).
NASA may finally know what caused the Hubble Space Telescope's major computer glitch | Space
Engineers have traced the fault to the Power Control Unit (PCU) and plan to start implementing a fix tomorrow (Thursday July 15).
NASA may finally know what caused the Hubble Space Telescope's major computer glitch | Space
This was proposed in a novel I read in the early '90s. Been awhile, so I'm fuzzy on the author's name. Crawford Kilian maybe?
He's a Canadian author previously unknown to me.
His body of work looks interesting. Can you recognise the novel you read in this list?
Crawford Kilian
I think it was Gryphon. I vaguely recall some of the characters used hehe tecquiques to alter their appearances and characteristics to suit their activities. But as I said, it was decades ago for me. Maybe I'll find another copy.
The main character's "steamship" certainly fits the nuclear thermal propulsion profile.
SF Adventure With a Bit of Everything: Gryphon by Crawford Kilian | Tor.com
You don't need vacuum for zero gravity.
I even heard some reporter say: "they went up to 50 miles, high enough to experience zero gravity.". Lots of people have trouble to unravel vacuum, gravity, free fall and high altitude apparently.
Jan
Mega comet Bernardinelli-Bernstein has become active at the incredible distance of 19 astronomical units from the Sun - roughly double the orbital radius of Saturn.
At the end of June, astronomers in New Zealand were the first to spot a coma, or zone of gas and dust, spreading around the mega comet.
Bernardinelli-Bernstein is truly of gargantuan size. It may have 1,000 times the mass of a typical comet and, at around 100km in diameter, it is three times as large as the next-known largest comet nucleus - that of Comet Hale-Bopp, the famous naked-eye comet that passed by Earth in 1998.
However, there's no need to worry about this monster coming dangerously close to Earth, as its distance of closest approach will still be beyond Saturn in January 2031.
Astronomers spot first activity on giant megacomet beyond Saturn | Space
C/2014 UN271 (Bernardinelli-Bernstein) - the largest comet ever discovered
At the end of June, astronomers in New Zealand were the first to spot a coma, or zone of gas and dust, spreading around the mega comet.
Bernardinelli-Bernstein is truly of gargantuan size. It may have 1,000 times the mass of a typical comet and, at around 100km in diameter, it is three times as large as the next-known largest comet nucleus - that of Comet Hale-Bopp, the famous naked-eye comet that passed by Earth in 1998.
However, there's no need to worry about this monster coming dangerously close to Earth, as its distance of closest approach will still be beyond Saturn in January 2031.
Astronomers spot first activity on giant megacomet beyond Saturn | Space
C/2014 UN271 (Bernardinelli-Bernstein) - the largest comet ever discovered
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That's correct, but I was up for a bit of fun! 😀
We've all experienced free-fall for that brief instant when the lift (elevator) starts its downward descent and the floor seems to fall away from under our feet.
Just pray the lift cable doesn't break or your period of weightlessness will be unhappily extended!
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Like this
Mine Elevator Crash Kills 100 In South Africa
I’ve been 7 000 feet down a mine to fix some instrumentation. The rock face was so hot you could not touch it. They pump ice down there to cool it. The guys only work 4 hour shifts. I’d say one of the more sobering things I’ve done.
The top ten deepest mines in the world
Mine Elevator Crash Kills 100 In South Africa
I’ve been 7 000 feet down a mine to fix some instrumentation. The rock face was so hot you could not touch it. They pump ice down there to cool it. The guys only work 4 hour shifts. I’d say one of the more sobering things I’ve done.
The top ten deepest mines in the world
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I had read a little about this giant comet in 2031. As big as a asteroid. But it won't be very bright. We won't be able to see it.
Bonsai's list of the 10 deepest mines rung a bell on Sudbury, Canada. I used to work for International Nickel. It's the remains of a giant 10-15km meteorite. The second biggest impact crater at 130km. in the last 2Bn years. Presumably Cupro-Nickel.
Most of the world's gold production comes from deep mines in South Africa. Again a meteorite, but probably deep crust thrown to the surface by the largest impact crater at 160km.
The second biggest meteorite was 66M years ago off Mexico. Wiped out the dinosaurs.
List of impact craters on Earth - Wikipedia
You could say Meteorites have considerable Economic Impact in the Mining Game...
Impact crater - Wikipedia
Bonsai's list of the 10 deepest mines rung a bell on Sudbury, Canada. I used to work for International Nickel. It's the remains of a giant 10-15km meteorite. The second biggest impact crater at 130km. in the last 2Bn years. Presumably Cupro-Nickel.
Most of the world's gold production comes from deep mines in South Africa. Again a meteorite, but probably deep crust thrown to the surface by the largest impact crater at 160km.
The second biggest meteorite was 66M years ago off Mexico. Wiped out the dinosaurs.
List of impact craters on Earth - Wikipedia
You could say Meteorites have considerable Economic Impact in the Mining Game...
Impact crater - Wikipedia
Agree with that Steve. Gold is heavy, so should have all sunk towards the centre of the earth when it was still molten. Some later event(s) must have stirred things up.
That's correct Pete. Gold sank to the Earth's core during the planet's formation. It's only accessible today because of asteroid bombardment.
How Is Gold Formed? Origins and Process
How Is Gold Formed? Origins and Process
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