… Recently we found evidence that spacetime curvature alone without the need for an event horizon leads to black hole evaporation (… this is pair generation !). …

Great ! Now tell me : what’s the implications of this on cosmological spacetime curvature ?

Original free access article :
https://iopscience.iop.org/article/10.1088/1361-6633/adc82e
Gravity generated by four one-dimensional unitary gauge symmetries and the Standard Model

if i get even 0.01% of what this is, then, they really reached a “Theory of Everything” but it can’t be experimentally tested until quantum gravity things are detected.

i agree with all of this except, you know, when they will have to do maintenance … i guess they will be (they would be) more simply hauling the whole thing out to work at the surface of the sea … in this scenario the mechanical components would be at the top of the sphere and out of the water.

Perfect guess ! (afaik) ρ(concrete) ≈ 2.5 tons/m³
so full sphere ≈ (2.5 x 382) tons = 955 tons
they have 400 t so the cavity removes :
955 - 400 = 555 t … so 7.51m diam. cavity
… so, yes 3/4m thick wall 😌👍 !

indeed i made a very simplified calculation not taking into account increase density of salted water nor increased density because of compressibility of water at 500 m deep. Basically i took 1m³(water) is 1 (metric) ton.

… a sphere nine metres in diameter and weighing 400 tonnes will be submerged off the coast of California at a depth of 500 to 600 metres. It will have a storage capacity of 0.4 megawatt hours (400 kWh) …

i will try a rough calculations : suppose we can have concrete at $100 per ton, then it’s a minimum investment of $40,000. Also suppose electricity is stored with a large added value of 10 cents per kilowatt hour, so, for every cycle a rough gain of $40. By these numbers, 1,000 cycles would pay for the concrete … so, it may look good considering they plan a life of about 50 years for such devices.
On the other hand if competitive battery storage cost only one cents per kilowatt hour (temporary in and out storage) and if concrete and fabrication goes up 10 times to $1,000 per ton then it is not economically viable anymore.

A good calculation of profitability would need to take into account the less than 100% energy efficiency of batteries cycling and of hydraulic energy cycling, … and so many more parameters which have to be studied.

… you’d need some massive …
from the srticle :
… a sphere nine metres in diameter and weighing 400 tonnes will be submerged …

Can you calculate the weight of a sphere of 9 m of displaced water ?
No ? Well, it is 382 tons.
So, the concrete sphere is already massive by itself. “You” don’t need any complicated anchoring.
Same goes with the rest of your mechanical engineering intuitions : you did not work in this domain or study it, did you 😆 ?
Also, stress cycling is bad on most material, yes. But here it is compressive stress and the geometry is symmetric. Without further study, i want to believe this thing has good potential and my intuitions tells me it looks nice. Time will tell 😁 !

it’s a basic human right to get rid of waste, including that Trump turd.

if proportional “messages” were sent by other countries, Israel would shut it’s fucking mouth. For good.

Why would the robots doing all the other jobs listen to this delusional human ?

title : U.S. Chipmakers Fear They Are Ceding China’s A.I. Market to Huawei

After failing to destroy A.I. in China, Americans regret not dominating it.

i like this part :

There’s no specific reason why the reported Chain-of-Thought must accurately reflect the true reasoning process; there might even be circumstances where a model actively hides aspects of its thought process from the user.

Even people don’t always say what they think … and this applies to the few ones who do.

Booby trapped packages aimed to explode in warehouses and eventually in cargo planes across the Atlantic … i think such attacks will trigger war measures on shipments.

(…) quenching supercurrents in a superconducting YBa₂Cu₃O₇ thin disc exposed to an external magnetic field. Supercurrents naturally form to expel magnetic fields from superconductors. "By abruptly disrupting these currents using ultrashort laser pulses, we could generate ultrafast magnetic field steps with rise times of approximately one picosecond (…)

Such a magnetic field (change) will propagate (at the speed of light in vacuum) during that time (10^-12 s) to a distance of about 0.3 millimeter. So, don’t go too far away if you want to see that change happened this fast !

inept demagogue has delusion that crashing the economy makes it better … go figure.

Promising :

“The reason why China is making rapid progress today is because we are combining it with actual applications and iterating and improving rapidly in real scenarios,” said Cheng Yuhang, a sales director with Deep Robotics, one of China’s robot startups. “This is something the U.S. can’t match.”

Quantum Ampere Standard
https://www.nist.gov/noac/technology/current-and-voltage/quantum-ampere-standard
.
there also been research for defining a quantum volt and quantumly stable resistors

https://www.nist.gov/noac/technology/current-and-voltage
Quantum-based measurements for voltage and current are moving toward greater miniaturization

P.S. :
https://en.m.wikipedia.org/wiki/Quantum_Hall_effect
Quantum Hall effect →
Applications →
Electrical resistance standards :

(…) Later, the 2019 revision of the SI fixed exact values of h and e, resulting in an exact
RK = h/e² = 25812.80745… Ω.

(this is precise to at least 10 significant digits)

Why sustain all those nasty pink pricks and self questionings when you can simply have hundred or thousand of horrendous deaths so smoothly ? /S

We do agree that the war is bad and we do agree why it is bad.
We will not agree on the causes of the war - - it will take many, many years of peace, for the fog of war to dissipate, on both sides, before we see what really happened.