Oh wonderful!
sodium_nitride
Why are we pretending that nation-states are singular entities with their own "wills"? They are networks of intelligent actors exchanging information and "energy" (money in this case). The "israel" net is heavily overlapped with the "america" net, and there is a large flow of information/energy across the 2 nets. The "america" net being much larger gives more of its energy to "israel" than vice versa, but the word "control" is meaningless for describing interactions as complicated geopolitics.
A lot of the discourse around this whole topic uses the verbal short-hand of treating nation-states as if they were entities with a will. And for good reason because a lot of the times, it's an OK approximation. But other times, you just end up arguing about meaningless things.
Although in theory digital circuits have to deal with quantisation error, the imprecision of analog computing also makes it face a similar problem. There is always going to be an error bar. If it will be lower with analog computers, that's great.
As for the AI sigmoid curves, they do not need to actually be sigmoid curves. The point is to clip output and add non-linearity. The discrete steps are not a problem and I've seen some AI architectures for even 2-bit models.
But you are correct that digital circuits experience fundamental limitations of accuracy that could in theory be bypassed by analog circuits. I don't think analog circuits are bad, and am quite excited for them. I'm just wary of the overwhelming amounts of clickbait from journalists.
its voltage just is the gradient.
I'm not sure what set up the peking university experiment uses, but the voltage is proportional to the gradient of current only if you feed current to an inductor, and the proportionality constant is dependent on the inductor and surrounding components.
I think I will try to read the paper when I'm done with exams, because I am curious on the peking researchers' technique.
the breakthrough achieves analog computation accuracy comparable to digital systems, improving analog precision by five orders of magnitude — or nearly 100,000 times.
This statement needs much elaboration before it becomes meaningful.
Unlike digital chips that move data back and forth between memory and processor cores (a process that consumes huge energy), RRAM executes computations directly within memory cells.
I'm 90% sure you can do in-memory computing with digital as well
Throughput hundreds to thousands of times higher than top-tier GPUs. Energy efficiency improvements of up to 1,000x
This seems rather amazing and extravagant. I would say that there are many obstacles before this type of thing could be put into the real world, but with China, they can do it. Probably they won't get thousands of times the performance of digital GPUs outside lab conditions, and not for all applications, but this could be a big leap forward.
Certainly, but under capitalism, capital is always overpriced, especially in less developed countries. Many places where this kind of thing would be useful would look at the upfront costs and just go for lithium batteries instead. They might even take the pakisthan approach of having large numbers of individual consumers install solar+battery packs for individual use.
Doing some calculations about space usage, it's also not good, even if you pack shit tons of mass together.
Supposing a 100 m column using blocks that have a density of 3000 kg/m^3. Blocks are lifted from when their bottom touches h=0 m to when their top touches h=100 m
The energy stored is maximised when the total height of all blocks in this column is 50 m. Their center of mass travels from 25m to 75m for 50m difference.
The energy stored per unit area= densityg(height difference^2)
This comes out to 73.575 MJ per square meter, or 20.4 kWh per square meter. This is, not a lot.
So you mean that getting battery materials is polluting? Yes, that's true, but the energy density of gravity batteries (excl. Hydro) is simply too low. Their adoption rates will be low. Battery chemistries and configurations will continue to improve, while gravity batteries are already close to the best they will ever be.
I'm not sure what you mean by chowing through to get to the battery.
I think this project makes more sense as a short term grid stabiliser rather than an energy storage unit.
The power output is good, and would be clean and have inertia. That's something batteries struggle with.
This kind of facility could replace flywheels. But not batteries.
A good lithium battery can store 250 Wh/kg. That's 900 kilo joules.
How high would have to lift a kilogram of matter to get the same energy storage?
Approximately 91,743 meters
Technically, you could replace a kilo of lithium ion battery with 1000 kilos of waste material and lift it by 100 meters to get similar energy output
But at that point, how many poor countries are going to bother? It's a lot of construction costs and space usage.
At the end of the day, the electoral system is a contest of strength between 2 or more cults of personality. This is more prevalent in some countries than other, but the very basic aspect of representative "democracy", aka elections (selecting a person to rule) basically boils down to giving a few people the power to make decisions for everybody else. It's dictatorial by nature.

(Source)[https://www.iea.org/countries/china/electricity]

(Source)[https://www.iea.org/countries/united-states/electricity]
Energy data from 2023 indicates that Chinese households and the service consume way less energy than American households (per capita). For households, it's about 1/4rth. For services, it's about 1/8th per capita (rounded figures).


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Absolutely based.
This user gets it.