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Index » Internet/Computer » The Web » Tech & Science Page: 1, 2, 3 ... 194, 195, 196  Next
Post to this Topic
thisbody

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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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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)
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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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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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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
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Posted: May 7, 2023 - 9:32am


Red_Dragon

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Location: Dumbf*ckistan


Posted: Mar 15, 2023 - 8:01pm

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

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Location: Dumbf*ckistan


Posted: Oct 24, 2022 - 3:09pm

Aluminium alloy could boost spacecraft radiation shielding 100-fold
Red_Dragon

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Location: Dumbf*ckistan


Posted: Aug 29, 2022 - 5:53pm

 R_P wrote:



awesome
R_P

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Posted: Aug 29, 2022 - 5:25pm


R_P

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Posted: Aug 24, 2022 - 9:39pm


Red_Dragon

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Location: Dumbf*ckistan


Posted: Aug 6, 2022 - 3:17pm

Why the Rotary Engine Is Perfect for Hydrogen Fuel
Red_Dragon

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Location: Dumbf*ckistan


Posted: Jul 23, 2022 - 1:13pm

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

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Posted: Jul 2, 2022 - 1:29pm

 Steely_D wrote:






Steely_D

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Posted: Jul 2, 2022 - 6:26am

 haresfur wrote:




haresfur

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Posted: Jul 1, 2022 - 8:30pm


miamizsun

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Location: (3283.1 Miles SE of RP)
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Posted: Jun 26, 2022 - 8:29am

such an inspiring video regarding science, especially biology/biotech

neurosurgeon turned researcher to develop tools and treatments


miamizsun

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Posted: Jun 23, 2022 - 5:38pm


Steely_D

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Posted: May 30, 2022 - 9:38am

Possible meteor shower this evening.
Red_Dragon

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Location: Dumbf*ckistan


Posted: May 30, 2022 - 8:01am

How a cheap component could help kill off combustion cars
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