HNHacker News
TopNewBestAskShowJobs

NGC404

48 karma · joined September 1, 2019

submissionscomments
NGC404··on Bicycle
Somewhat related:

How many neurons does it take to ride a bycicle?

https://paradise.caltech.edu/~cook/papers/TwoNeurons.pdf

NGC404··on Small Asteroid Impacts Moon
Nasa has a Program called "Lunar Impact Monitoring".

See:

https://link.springer.com/article/10.1007/s11038-007-9184-0

https://ntrs.nasa.gov/api/citations/20150021386/downloads/20...

http://lunarnetworks.blogspot.com/2013/05/brightest-impact-r...

The data collected by the "Lunar Reconnaissance Orbiter" can be used to estimate the frequency of impacts.

https://www.lroc.asu.edu/posts/943

NGC404··on Deutschlandticket for regional bus and rail services to be offered for €49/month
It truely is. I found it years ago and have used the data in various projects since then. :)
NGC404··on Deutschlandticket for regional bus and rail services to be offered for €49/month
it indeed is hardly possible. See: https://www.openrailwaymap.org/
NGC404··on Ionocaloric refrigeration cycle
That is indeed interesting to think about. What exact mechanism did you had in mind for thermal energy transport?
NGC404··on July 8 99% of the world’s population in sunlight simultaneously?
<irony with a whiff of doom> Perfect timing for an X1000 solar flare.

"The old Axolotl" - Jacek Dukaj

NGC404··on What Flips Your Bit: Cosmic Ray Errors at Mozilla
http://energysfe.ufsc.br/slides/Paolo-Rech-260917.pdf
NGC404··on The Unix timestamp will begin with 16 this Sunday
correct
NGC404··on The Unix timestamp will begin with 16 this Sunday
Next iteration of unix-time should include the concept of local time in context of relativty if we are going to travel or communicate over significant distances.
NGC404··on The Unix timestamp will begin with 16 this Sunday
anyone throwing a party for the illuminated?
NGC404··on The Unix timestamp will begin with 16 this Sunday
All dates describing pattern:

code:

#!/bin/bash

for t in $(seq 0 100000000 $((2* * 31))); do date -u -d @$t +'%s -> %c'; done

output:

0 -> Do 01 Jan 1970 00:00:00 UTC

100000000 -> Sa 03 Mär 1973 09:46:40 UTC

200000000 -> Mo 03 Mai 1976 19:33:20 UTC

300000000 -> Do 05 Jul 1979 05:20:00 UTC

400000000 -> Sa 04 Sep 1982 15:06:40 UTC

500000000 -> Di 05 Nov 1985 00:53:20 UTC

600000000 -> Do 05 Jan 1989 10:40:00 UTC

700000000 -> Sa 07 Mär 1992 20:26:40 UTC

800000000 -> Di 09 Mai 1995 06:13:20 UTC

900000000 -> Do 09 Jul 1998 16:00:00 UTC

1000000000 -> So 09 Sep 2001 01:46:40 UTC

1100000000 -> Di 09 Nov 2004 11:33:20 UTC

1200000000 -> Do 10 Jan 2008 21:20:00 UTC

1300000000 -> So 13 Mär 2011 07:06:40 UTC

1400000000 -> Di 13 Mai 2014 16:53:20 UTC

1500000000 -> Fr 14 Jul 2017 02:40:00 UTC

1600000000 -> So 13 Sep 2020 12:26:40 UTC

1700000000 -> Di 14 Nov 2023 22:13:20 UTC

1800000000 -> Fr 15 Jan 2027 08:00:00 UTC

1900000000 -> So 17 Mär 2030 17:46:40 UTC

2000000000 -> Mi 18 Mai 2033 03:33:20 UTC

2100000000 -> Fr 18 Jul 2036 13:20:00 UTC

--------------------------------------------------------------

overflow of currently used datatype for timer happening at:

code:

#!/bin/bash date -u -d @2147483648 +'%s -> %c'

output:

2147483648 -> Di 19 Jan 2038 03:14:08 UTC

info:

https://en.wikipedia.org/wiki/Year_2038_problem

--------------------------------------------------------------

other interesting date:

pi day:

date -u -d @3141592653 +'%s -> %c'

3141592653 -> So 21 Jul 2069 00:37:33 UTC (100th birthday for moonlanding mission on pi-day/sec)

NGC404··on Scientists Develop Plasma Thruster That Could One Day Power Planes
Thank you for you insight.
NGC404··on Scientists Develop Plasma Thruster That Could One Day Power Planes
Can someone maybe with lab experience in propulsion or comparable knowledge confirm that their method to measure the thrust of the plasmathruster is in any way comparable to proper thrustmeasurement / produces forcevalues correlatable to those measured with an unobstructed outlet and proper equipment?
NGC404··on Tesla’s European gigafactory will be built in Berlin
The number sold electric vehicles in germany is still exponential not saturated, the government recently announced to build additional charging stations across the country in the order of 10 thousands and to increase the (tax) incentives for hybrid and fully electric cars. It is a good time to build a factory for electric cars in germany. Berlin is a sweet spot when it comes to talent in high tech, suppliers and transport connection.
NGC404··on Tesla’s European gigafactory will be built in Berlin
I bet elon will not be able to land in BER for the celebation of the millionth car rolled out there.
NGC404··on Molekule Air Mini home air purifier will debut for $400
This industry needs more players to drive the price down. 400$ for extruded plastic hull, cheap electronics, a fan, a filter (and a battery pack for a mobile device) is way to much. I build one for my flat for less than 50$...
NGC404··on Tom Delonge’s UFO Research Center Is Making Politicians Demand Answers
~same topic

now:

https://news.ycombinator.com/item?id=21008930

https://news.ycombinator.com/item?id=21008988

https://news.ycombinator.com/item?id=20997012

older:

https://news.ycombinator.com/item?id=19828448

NGC404··on Energy of the 229 Th nuclear clock transition
Full preprint/paper:

https://arxiv.org/abs/1710.11398

NGC404··on An innovative approach to making electricity from the wind
Solar and Wind are free and widely availabe primary energy sources. No infrastructure is needed to dig it/pump it up, transport it and process it befor it is usable, as with fossile fuels and nuclear power.
NGC404··on Spaceflight from the Backyard
some general information:

http://www.hobbyspace.com/SatWatching/

http://www.satobs.org/satintro.html

http://www.astrophoto.fr/satellites.html (well known guy)

https://www.n2yo.com/?s=39030

NGC404··on Spaceflight from the Backyard
@location: Light Pollution has gotten worse over time (with the exception of a few countrys with policies regarding that). VIIRS Data might offer a basis for choosing a backyard: https://www.lightpollutionmap.info/#zoom=3&lat=4695853&lon=-...