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Song of the Day - oldviolin - Nov 13, 2024 - 1:06pm
 
Lyrics that strike a chord today... - oldviolin - Nov 13, 2024 - 1:05pm
 
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Israel - Proclivities - Nov 13, 2024 - 12:58pm
 
Trump - Red_Dragon - Nov 13, 2024 - 12:46pm
 
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NYTimes Connections - islander - Nov 13, 2024 - 9:28am
 
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Today in History - islander - Nov 13, 2024 - 9:04am
 
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Yes - Isabeau - Nov 13, 2024 - 8:55am
 
TWO WORDS - GeneP59 - Nov 13, 2024 - 7:47am
 
Poll (if such things were possible): Influence of CanuckB... - kurtster - Nov 13, 2024 - 12:23am
 
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Agents of TRUTH - oldviolin - Nov 12, 2024 - 7:42am
 
Little known information... maybe even facts - oldviolin - Nov 12, 2024 - 7:14am
 
• • • The Once-a-Day • • •  - oldviolin - Nov 12, 2024 - 6:24am
 
Photography Forum - Your Own Photos - Alchemist - Nov 11, 2024 - 11:40pm
 
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Bluesky - instead of Twitter - Beaker - Nov 11, 2024 - 8:50pm
 
Kamala Harris - Beaker - Nov 11, 2024 - 8:24pm
 
Positive Thoughts and Prayer Requests - GeneP59 - Nov 11, 2024 - 8:14pm
 
Election Predictions - ScottFromWyoming - Nov 11, 2024 - 6:04pm
 
Dialing 1-800-Manbird - oldviolin - Nov 11, 2024 - 5:52pm
 
Photos you have taken of yourself - Isabeau - Nov 11, 2024 - 1:05pm
 
GHOST RIDERS IN THE SKY - oldviolin - Nov 11, 2024 - 11:22am
 
The Obituary Page - oldviolin - Nov 11, 2024 - 9:46am
 
Outstanding Covers - oldviolin - Nov 11, 2024 - 9:03am
 
Food Democracy - black321 - Nov 11, 2024 - 7:28am
 
New Music - R_P - Nov 10, 2024 - 8:53pm
 
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Media Bias - ScottFromWyoming - Nov 8, 2024 - 11:07am
 
One Partying State - Wyoming News - islander - Nov 8, 2024 - 8:32am
 
• • • Things Magicians Exclaim • • •  - Manbird - Nov 7, 2024 - 3:23pm
 
Derplahoma! - Red_Dragon - Nov 7, 2024 - 3:02pm
 
Internet Radio - ScottFromWyoming - Nov 7, 2024 - 12:19pm
 
Periodic wake up call - oldviolin - Nov 7, 2024 - 7:58am
 
Index » Internet/Computer » The Web » Tech & Science Page: 1, 2, 3 ... 194, 195, 196  Next
Post to this Topic
Red_Dragon

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Location: Gilead


Posted: Sep 30, 2024 - 4:29pm

A tiny town just got slammed by Helene. It could massively disrupt the tech industry
Manbird

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Location: La Villa Toscana
Gender: Male


Posted: Jul 12, 2024 - 2:46pm

 R_P wrote:
Most accurate clock in history made by ‘quieting’ atoms
Strontium-based timepiece gains or loses only one second every 40 billion years.


prove it
R_P

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Gender: Male


Posted: Jul 12, 2024 - 2:40pm

Most accurate clock in history made by ‘quieting’ atoms
Strontium-based timepiece gains or loses only one second every 40 billion years.

Strontium Lattice Is Now the World's Most Accurate Clock
thisbody

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Location: out of space
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

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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

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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

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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

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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

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


Posted: May 7, 2023 - 9:32am


Red_Dragon

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Location: Gilead


Posted: Mar 15, 2023 - 8:01pm

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

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Location: Gilead


Posted: Oct 24, 2022 - 3:09pm

Aluminium alloy could boost spacecraft radiation shielding 100-fold
Red_Dragon

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Location: Gilead


Posted: Aug 29, 2022 - 5:53pm

 R_P wrote:



awesome
R_P

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Gender: Male


Posted: Aug 29, 2022 - 5:25pm


R_P

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Gender: Male


Posted: Aug 24, 2022 - 9:39pm


Red_Dragon

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Location: Gilead


Posted: Aug 6, 2022 - 3:17pm

Why the Rotary Engine Is Perfect for Hydrogen Fuel
Red_Dragon

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Location: Gilead


Posted: Jul 23, 2022 - 1:13pm

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

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


Posted: Jul 2, 2022 - 1:29pm

 Steely_D wrote:






Steely_D

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Location: Biscayne Bay
Gender: Male


Posted: Jul 2, 2022 - 6:26am

 haresfur wrote:




haresfur

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Location: The Golden Triangle
Gender: Male


Posted: Jul 1, 2022 - 8:30pm


miamizsun

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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


Page: 1, 2, 3 ... 194, 195, 196  Next