mersenneforum.org  

Go Back   mersenneforum.org > Extra Stuff > Science & Technology

Reply
 
Thread Tools
Old 2020-12-18, 09:49   #2850
retina
Undefined
 
retina's Avatar
 
"The unspeakable one"
Jun 2006
My evil lair

608310 Posts
Default

Quote:
Originally Posted by LaurV View Post
They even were not clever enough to hide it completely. I mean, it will cost you money to read it, but only if you are silly (correctly: computer illiterate).
I suspect the website "designer" is also somewhat computer illiterate. Haha, "wrappro-paywall", they were misled by the name of the tool, thinking it was some super-uber pro thing.
retina is online now   Reply With Quote
Old 2020-12-18, 13:20   #2851
Xyzzy
 
Xyzzy's Avatar
 
"Mike"
Aug 2002

24·499 Posts
Default

For retina: https://motherfuckingwebsite.com/

PS - Some may say this is NSFW. If the people you work for are that sensitive maybe consider getting a new job!
Xyzzy is offline   Reply With Quote
Old 2020-12-18, 13:37   #2852
retina
Undefined
 
retina's Avatar
 
"The unspeakable one"
Jun 2006
My evil lair

10111110000112 Posts
Default

Quote:
Originally Posted by Xyzzy View Post


http://bettermotherfuckingwebsite.com/
https://thebestmotherfucking.website/
https://perfectmotherfuckingwebsite.com/
retina is online now   Reply With Quote
Old 2021-01-16, 15:07   #2853
TommyJ
 
"Tom Johnson"
Dec 2020
United Kingdom

11 Posts
Default Oldest "Super Earth"

A hot, rocky “super Earth,” near one of the oldest stars in the galaxy has taken a team of planet-hunting scientists by surprise.

rocky planet graphic
Artist’s rendition of TOI-561, one of the oldest, most metal-poor planetary systems discovered yet in the Milky Way galaxy. (W. M. Keck Observatory/Adam Makarenko)
The planet is about 50 percent larger than Earth but requires less than half a day to orbit its star.

“For every day you’re on Earth, this planet orbits its star twice,” said UC Riverside planetary astrophysicist and team member Stephen Kane.

https://news.ucr.edu/articles/2021/0...s-oldest-stars
TommyJ is offline   Reply With Quote
Old 2021-01-19, 14:39   #2854
retina
Undefined
 
retina's Avatar
 
"The unspeakable one"
Jun 2006
My evil lair

608310 Posts
Default

https://phys.org/news/2021-01-smart-aerogel-air.html
Quote:
In a humid environment, one kilogram of [a type of aerogel] will produce 17 liters of water a day.
I'm not sure what they define as a requirement for a "humid environment". I suppose that discounts Antarctica. But the tropics are fair game, and probably the type of place where you'd need it the most.
Quote:
It also does not need a battery.

Last fiddled with by retina on 2021-01-19 at 14:41
retina is online now   Reply With Quote
Old 2021-01-19, 16:42   #2855
Dr Sardonicus
 
Dr Sardonicus's Avatar
 
Feb 2017
Nowhere

434210 Posts
Default

Quote:
Originally Posted by retina View Post
https://phys.org/news/2021-01-smart-aerogel-air.html
Quote:
In a humid environment, one kilogram of [a type of aerogel] will produce 17 liters of water a day.
I'm not sure what they define as a requirement for a "humid environment". I suppose that discounts Antarctica. But the tropics are fair game, and probably the type of place where you'd need it the most.
Quote:
It also does not need a battery.
Hmm. The question "What about the heat?" occurs to me. I may be overlooking something obvious, or messing up the calculation, but it seems like this thing would be putting out a significant amount of heat: When water condenses into liquid from vapor, it releases its "latent heat of vaporization." The latent heat of vaporization of water is huge - I recall 540 calories per gram from high school chem class which is (Google Google) 2260 kJ/kg. (That's at 100C, I'm guessing it's not too different and possibly higher at ambient.)

A liter of water has a mass of just about 1kg, so condensing 17 liters of water releases 17*2260*1000 joules of heat, which over 24 hours comes out to putting out heat at a rate of

(17*2260*1000)/(24*60*60) J/sec, i.e. 444.67+ watts

You might be able to use that much heat to do some useful work...
Dr Sardonicus is offline   Reply With Quote
Old 2021-01-20, 03:37   #2856
retina
Undefined
 
retina's Avatar
 
"The unspeakable one"
Jun 2006
My evil lair

7×11×79 Posts
Default

Quote:
Originally Posted by Dr Sardonicus View Post
Hmm. The question "What about the heat?" occurs to me. ... 2260 kJ/kg. (That's at 100C, I'm guessing it's not too different and possibly higher at ambient.)
According to WP: https://en.wikipedia.org/wiki/File:H...2BWater%29.png

At room temperature (20C) it is about 44kJ/mol. Which translates to ~480W continuous heat output. A thermocouple could convert that to a flow of electrons.

But I'm unsure of the power density. The aerogel is very sparse, so 1kg would be quite large in physical size. So maybe the temperature increase is quite modest.

Also with no battery they don't say how the air is kept flowing over the aerogel. So perhaps the excess heat can be used to drive fans to create the airflow.

Last fiddled with by retina on 2021-01-20 at 03:38
retina is online now   Reply With Quote
Old 2021-01-26, 02:47   #2858
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

927510 Posts
Default

Related to that, I remember a nice SF story I read over 40 years ago (and which is about 111 years old - that's a decimal number, not a binary one, hehe). It was called "the machine stops" (lucky, the original title is the same as the Ro version I read, so it was easy to gulugulu it). Must to read.
LaurV is offline   Reply With Quote
Old 2021-01-26, 03:21   #2859
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

100100001110112 Posts
Default

Quote:
Probability of success: 8/10. Russia knows how to land a spacecraft on the moon. Its chaotic space agency just needs to launch it.
Bwhaaa haha! Genau! Richtig!
LaurV is offline   Reply With Quote
Old 2021-01-26, 07:23   #2860
jwaltos
 
jwaltos's Avatar
 
Apr 2012
Standing, top right.

32×41 Posts
Default

Quote:
Originally Posted by LaurV View Post
"[URL="https://en.wikipedia.org/wiki/The_Machine_Stops"]
Just read the wiki synopsis...reminds me of a recent political situation where the machine was already broken but the mending apparatus was able to patch up what it could so it could toddle on.
jwaltos is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Official "Faits erronés dans de belles-lettres" thread ewmayer Lounge 39 2015-05-19 01:08
Official "all-Greek-to-me Fiction Literature and Cinema" Thread ewmayer Science & Technology 41 2014-04-16 11:54
Official "Lasciate ogne speranza" whinge-thread cheesehead Soap Box 56 2013-06-29 01:42
Official "Ernst is a deceiving bully and George is a meanie" thread cheesehead Soap Box 61 2013-06-11 04:30
Official "String copy Statement Considered Harmful" thread Dubslow Programming 19 2012-05-31 17:49

All times are UTC. The time now is 02:23.

Sat Mar 6 02:23:52 UTC 2021 up 92 days, 22:35, 0 users, load averages: 2.27, 2.09, 1.66

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.