[ ]   [ ]   [ ]                        [ ]      [ ]   [ ]

Trump - kcar - Jun 12, 2024 - 10:08pm
 
Derplahoma! - ScottFromWyoming - Jun 12, 2024 - 9:29pm
 
June 2024 Photo Theme - Eyes - fractalv - Jun 12, 2024 - 9:05pm
 
Florida - Red_Dragon - Jun 12, 2024 - 7:59pm
 
Business as Usual - R_P - Jun 12, 2024 - 6:17pm
 
NYTimes Connections - geoff_morphini - Jun 12, 2024 - 4:10pm
 
Israel - R_P - Jun 12, 2024 - 3:47pm
 
NY Times Strands - rgio - Jun 12, 2024 - 1:10pm
 
Wordle - daily game - islander - Jun 12, 2024 - 10:05am
 
The Obituary Page - ScottFromWyoming - Jun 12, 2024 - 9:16am
 
Guantánamo Resorts & Other Fun Trips - R_P - Jun 12, 2024 - 8:41am
 
Joe Biden - rgio - Jun 12, 2024 - 8:28am
 
Radio Paradise Comments - miamizsun - Jun 12, 2024 - 8:04am
 
Name My Band - oldviolin - Jun 12, 2024 - 5:17am
 
Today in History - DaveInSaoMiguel - Jun 12, 2024 - 2:46am
 
Right, Left, Right of Left, Left of Right, Center...? - kurtster - Jun 11, 2024 - 10:36pm
 
USA! USA! USA! - R_P - Jun 11, 2024 - 7:10pm
 
What Are You Going To Do Today? - thisbody - Jun 11, 2024 - 3:54pm
 
Mixtape Culture Club - KurtfromLaQuinta - Jun 11, 2024 - 3:51pm
 
Things You Thought Today - thisbody - Jun 11, 2024 - 2:45pm
 
Breaking News - Isabeau - Jun 11, 2024 - 2:29pm
 
Calling all RP Roku users! - RPnate1 - Jun 11, 2024 - 12:50pm
 
Vinyl Only Spin List - Steely_D - Jun 11, 2024 - 10:40am
 
Words that should be put on the substitutes bench for a year - sunybuny - Jun 11, 2024 - 4:38am
 
Europe - thisbody - Jun 11, 2024 - 1:23am
 
Marijuana: Baked News. - R_P - Jun 10, 2024 - 12:01pm
 
Climate Change - R_P - Jun 10, 2024 - 11:45am
 
Streaming Marantz/HEOS - rgio - Jun 10, 2024 - 11:43am
 
Is there any DOG news out there? - thisbody - Jun 9, 2024 - 12:38pm
 
Quick! I need a chicken... - thisbody - Jun 9, 2024 - 10:38am
 
Song of the Day - Proclivities - Jun 9, 2024 - 8:34am
 
China - R_P - Jun 8, 2024 - 7:42pm
 
Economix - Bill_J - Jun 8, 2024 - 5:25pm
 
Gotta Get Your Drink On - Antigone - Jun 8, 2024 - 2:42pm
 
Snakes & streaming images. WTH is going on? - rasta_tiger - Jun 8, 2024 - 2:16pm
 
Strips, cartoons, illustrations - R_P - Jun 8, 2024 - 11:28am
 
Great guitar faces - thisbody - Jun 8, 2024 - 10:39am
 
TEXAS - maryte - Jun 8, 2024 - 9:21am
 
NASA & other news from space - Beaker - Jun 8, 2024 - 8:23am
 
Live Music - oldviolin - Jun 7, 2024 - 10:03pm
 
• • • The Once-a-Day • • •  - oldviolin - Jun 7, 2024 - 9:54pm
 
Republican Party - kcar - Jun 7, 2024 - 8:11pm
 
favorite love songs - Manbird - Jun 7, 2024 - 8:06pm
 
Lyrics that are stuck in your head today... - Manbird - Jun 7, 2024 - 8:04pm
 
What the hell OV? - oldviolin - Jun 7, 2024 - 7:42pm
 
Can you afford to retire? - JrzyTmata - Jun 7, 2024 - 2:05pm
 
Old timers, crosswords & - ScottFromWyoming - Jun 7, 2024 - 12:09pm
 
Military Matters - R_P - Jun 7, 2024 - 11:31am
 
Bug Reports & Feature Requests - Laptopdog - Jun 7, 2024 - 11:09am
 
Favorite Quotes - black321 - Jun 7, 2024 - 7:45am
 
What makes you smile? - Red_Dragon - Jun 7, 2024 - 6:32am
 
Artificial Intelligence - johkir - Jun 6, 2024 - 3:57pm
 
Cryptic Posts - Leave Them Guessing - oldviolin - Jun 6, 2024 - 12:35pm
 
What's with the Sitar? ...and Robert Plant - thisbody - Jun 6, 2024 - 11:16am
 
songs that ROCK! - thisbody - Jun 6, 2024 - 10:39am
 
Democratic Party - kurtster - Jun 5, 2024 - 9:23pm
 
Canada - Beaker - Jun 5, 2024 - 1:58pm
 
the Todd Rundgren topic - miamizsun - Jun 5, 2024 - 5:00am
 
Photos you have taken of your walks or hikes. - MrDill - Jun 5, 2024 - 2:26am
 
What Makes You Laugh? - Steely_D - Jun 5, 2024 - 12:44am
 
Automotive Lust - KurtfromLaQuinta - Jun 4, 2024 - 9:28pm
 
Art Show - Manbird - Jun 4, 2024 - 8:20pm
 
Bad Poetry - Isabeau - Jun 4, 2024 - 12:11pm
 
Classic TV Curiosities - Isabeau - Jun 4, 2024 - 12:09pm
 
What's that smell? - Isabeau - Jun 4, 2024 - 11:50am
 
Music Videos - black321 - Jun 4, 2024 - 10:11am
 
Baseball, anyone? - ScottFromWyoming - Jun 4, 2024 - 8:28am
 
Your First Albums - Manbird - Jun 3, 2024 - 5:42pm
 
King Crimson - Steely_D - Jun 3, 2024 - 2:25pm
 
2024 Elections! - R_P - Jun 3, 2024 - 10:19am
 
Your favourite conspiracy theory? - Beaker - Jun 3, 2024 - 8:00am
 
Beer - Red_Dragon - Jun 3, 2024 - 5:20am
 
Ukraine - R_P - Jun 2, 2024 - 3:07pm
 
RP on Twitter - R_P - Jun 1, 2024 - 2:47pm
 
Football, soccer, futbol, calcio... - thisbody - Jun 1, 2024 - 10:20am
 
Index » Internet/Computer » The Web » Tech & Science Page: 1, 2, 3 ... 194, 195, 196  Next
Post to this Topic
thisbody

thisbody Avatar

Location: empty pages
Gender: Male


Posted: Nov 23, 2023 - 9:08am

Bright Satellites Are Disrupting Astronomy
Summary: Astronomers spent a lot of time asking SpaceX and other large satellite operators to pretty please make their satellites fainter and/or use fewer satellites. And then BlueWalker 3 was launched by some tiny company and is one of the brightest things in the sky. Asking nicely isn't working: international regulation and pollution penalties are needed.

From the author:
...
This article required weeks of back-and-forth with the editor, the editor-in-chief, and Nature's lawyers, so I hope that means it's a good one.
During this process, I learned that satellite companies are so powerful and litigious that even giant publishers like Nature are terrified of getting sued. Which is...rather worrying.

Lazy8

Lazy8 Avatar

Location: The Gallatin Valley of Montana
Gender: Male


Posted: Jul 29, 2023 - 9:19am

 Red_Dragon wrote:
I bet they use portable water filtration systems too, and shovels and shoes! When will this technological madness end?

When we look back on the media's breathless criticism of Elon Musk this article this article may prove to be peak hysteria.

miamizsun

miamizsun Avatar

Location: (3283.1 Miles SE of RP)
Gender: Male


Posted: Jul 29, 2023 - 7:21am

i've seen a bit of buzz about the "super conductivity" breakthrough
just check your science news feed
obviously i'm super skeptical
but in this case i would love to be wrong

NoEnzLefttoSplit

NoEnzLefttoSplit Avatar

Gender: Male


Posted: Jul 28, 2023 - 11:41pm

Toyota announces new battery tech
  and because I was intrigued about the implications for aviation.. here is a great paper summarizing current technologies. 
best bit:

"By comparison, state-of-the-art Li-ion batteries with an energy density of approximately 250 Wh/kg are 48 times less than jet fuels, which possess a staggering energy density of 12,000 Wh/kg <26>. However, according to Åhman <47> and, Haung and Zhang <48>, the fuel-to-wheel efficiency of an internal combustion engine averages ∼28%, while electric motors are ∼90% efficient. This reduces the ratio of batteries to aviation fuels from 1:48 to 1:15. Considering an average improvement of 600 Wh/kg battery energy density, the ratio is further reduced to 1:6.2. In addition, it has been proven through research that efficient aerodynamic designs such as distributed propulsion and boundary layer injection which are much more practical with electric aviation can reduce the overall energy consumption during flight by a factor of 3 to 5 <49>. Using the mean value of 4 reduces the ratio of batteries to aviation fuel to 1:1.5. In summary, the development approaches towards electric propulsion can be described as a three-point approach predicated on: 1. battery chemistries of minimum 600 Wh/kg, 2. advancement in electric motor design for high power applications, and 3. efficient aerodynamic design."

There is obviously a lot of blind optimism behind those figures. For instance jet turbines display 50% fuel efficiency, not the 28% cited here, but the trend is looking better than it did a couple of years ago. The new Toyota battery is expected to have an energy density of 450 Wh/kg, which is still some way off the minimum 600 Wh/kg stated above, so the more realistic alternative for zero-carbon aviation will probably remain synthetic bio-fuels for some time to come.






oldviolin

oldviolin Avatar

Location: esse quam videri
Gender: Male


Posted: May 7, 2023 - 11:46am

 DaveInSaoMiguel wrote:
 
Finally a solution for my infrequent magneto-reluctance! I was afraid I'd never get a sparkle...{#Wink}
DaveInSaoMiguel

DaveInSaoMiguel Avatar

Location: No longer in a hovel in effluent Damnville, VA
Gender: Male


Posted: May 7, 2023 - 9:32am


Red_Dragon

Red_Dragon Avatar

Location: Dumbf*ckistan


Posted: Mar 15, 2023 - 8:01pm

Musk brought internet to Brazil’s Amazon. Criminals love it.
Red_Dragon

Red_Dragon Avatar

Location: Dumbf*ckistan


Posted: Oct 24, 2022 - 3:09pm

Aluminium alloy could boost spacecraft radiation shielding 100-fold
Red_Dragon

Red_Dragon Avatar

Location: Dumbf*ckistan


Posted: Aug 29, 2022 - 5:53pm

 R_P wrote:



awesome
R_P

R_P Avatar

Gender: Male


Posted: Aug 29, 2022 - 5:25pm


R_P

R_P Avatar

Gender: Male


Posted: Aug 24, 2022 - 9:39pm


Red_Dragon

Red_Dragon Avatar

Location: Dumbf*ckistan


Posted: Aug 6, 2022 - 3:17pm

Why the Rotary Engine Is Perfect for Hydrogen Fuel
Red_Dragon

Red_Dragon Avatar

Location: Dumbf*ckistan


Posted: Jul 23, 2022 - 1:13pm

Google fires software engineer who claimed its AI chatbot is sentient
GeneP59

GeneP59 Avatar

Location: On the edge of tomorrow looking back at yesterday.
Gender: Male


Posted: Jul 2, 2022 - 1:29pm

 Steely_D wrote:






Steely_D

Steely_D Avatar

Location: Biscayne Bay
Gender: Male


Posted: Jul 2, 2022 - 6:26am

 haresfur wrote:




haresfur

haresfur Avatar

Location: The Golden Triangle
Gender: Male


Posted: Jul 1, 2022 - 8:30pm


miamizsun

miamizsun Avatar

Location: (3283.1 Miles SE of RP)
Gender: Male


Posted: Jun 26, 2022 - 8:29am

such an inspiring video regarding science, especially biology/biotech

neurosurgeon turned researcher to develop tools and treatments


miamizsun

miamizsun Avatar

Location: (3283.1 Miles SE of RP)
Gender: Male


Posted: Jun 23, 2022 - 5:38pm


Steely_D

Steely_D Avatar

Location: Biscayne Bay
Gender: Male


Posted: May 30, 2022 - 9:38am

Possible meteor shower this evening.
Red_Dragon

Red_Dragon Avatar

Location: Dumbf*ckistan


Posted: May 30, 2022 - 8:01am

How a cheap component could help kill off combustion cars
Page: 1, 2, 3 ... 194, 195, 196  Next