rklaehn

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211.
by rklaehn 6y ago
Sandy Munro has covered this. There are some bars in the front of the front casting. If those were damaged, you would just cut them away and weld replacements in place. If the main part of the casting gets bent, it will have been a very sev
212.
by rklaehn 6y ago
That would be awesome PR, and not that expensive with starship. But for low production rate things like telescopes, launch cost is almost negligible even at current launch prices. A replacement for hubble could be launched with a single fal
213.
by rklaehn 6y ago
Any major space power (Russia, China, India) will be able to dictate the conditions of Starlink operations. Basically: dear SpaceX, please switch off your sats over our territory, or we will do it for you.
214.
by rklaehn 6y ago
I think SpaceX would sell them launches. First of all, why wouldn't they? They are confident that their satellite tech is superior. And second, SpaceX is dominating the commercial launch market to such a degree that they would run into
215.
by rklaehn 6y ago
SpaceX has put in a lot of effort to reduce the visual pollution aspect of starlink. See https://twitter.com/ralfvandebergh/status/136999054076322611... for how the visibility of Starlink sats has changed over tim
216.
by rklaehn 6y ago
No idea. Just saying what I am observing. I got signal, telegram and element.io . I encourage non technically savvy people to go to signal and technically savvy people to go to element. But I see a lot of normal people switching to telegram
217.
by rklaehn 6y ago
My personal impression is that there has been a huge movement away from WhatsApp to Signal and Telegram in Germany in the last months. Not just typically privacy sensitive people, but also lots of normal people. Most people still have Whats
218.
by rklaehn 6y ago
Great opportunity to try out decentralised alternatives like https://radicle.xyz/
219.
by rklaehn 6y ago
I somehow still prefer ?, even in places where unwrap would be perfectly fine, like tests. unwrap is somehow unpleasant to look at. E.g. you can have tests that return an anyhow::Result<()>, and use ? anywhere in the test. The test wi
220.
by rklaehn 6y ago
Bad internet is not just a thing in developing nations. It is also an issue in developed countries as soon as you leave the cities. And factories are often in rural areas. E.g. in Germany, as soon as you leave the big cities, the options ar
221.
by rklaehn 6y ago
I would love this as well. There is a lot of ready made tech for off grid living these days. E.g. you can buy an island capable solar+storage system from many vendors, not just Tesla. You can buy very efficient and clean log-powered heating
222.
by rklaehn 6y ago
Local first is often just plain the better technical solution. E.g. you put a pin on a map to mark the parking spot, and want to share it with somebody standing right next to you. But it does not work because the connection to some data cen
223.
by rklaehn 6y ago
Rust error handling is great for reliable systems. But it used to be really annoying when just doing exploratory coding. With the anyhow crate, this problem is solved as well. Just use anyhow if you just want to try something out quickly wi
224.
by rklaehn 6y ago
Nice. Did not know about this. There is another company https://www.calysta.com/ that have a similar product called feedkind. Basically animal food that is made in a bioreactor from methane. Methane can be easily made from
225.
by rklaehn 6y ago
Sure. But electrolysis is >70% efficient, so even if the bacterial metabolism is only 30% efficient the end to end efficiency is a factor of 10 higher. You are also going straight to complex proteins, whereas photosynthesis produces just
226.
by rklaehn 6y ago
I think to create calorie rich base food, photosynthesis might be the completely wrong approach. It is extremely inefficient compared to photovoltaics. <1% vs >20%. A better approach might be to produce hydrogen via photovoltaics and
227.
by rklaehn 6y ago
I wasted a lot of time in my life. I was into C++ programming many years before the first dotcom boom. But I did not really profit from it. Instead I studied for many years, then slacked off for a few years, and only started working full ti
228.
by rklaehn 6y ago
I would say they are reasonably efficient. Of course many orders of magnitude slower than keeping it all in in memory maps and doing the traversal there, but fast enough to not be a limiting factor. Traversing a medium depth DAG with a mill
229.
by rklaehn 6y ago
Interesting. SQLite is awesome. I did something similar recently, a block store for a rust implementation of ipfs, which models a directed acyclic graph of content-addressed nodes. https://github.com/actyx/ipfs-sqlite-b
230.
by rklaehn 6y ago
An almost pure fusion bomb is technically possible and has been done multiple times. Usually it is not done for weapons designs since you got all those neutrons and can just double the yield by adding some 238U outer layer. But e.g. the US
231.
by rklaehn 6y ago
https://www.unisonweb.org/ Functional programming language where the canonical representation is a content-addressed directed acyclic graph. Solves all kinds of problems from dependencies to deployment and moving code betwe
232.
by rklaehn 6y ago
Any progress on the rust implementation? There was a lot of activity a few months ago, but now it seems that things have stalled.
233.
by rklaehn 6y ago
Can be quite high, in the 100 bar range and above.
234.
by rklaehn 6y ago
With the anyhow crate and ? syntax I find current rust error handling a pleasure to work with. Of course there are a few rough edges, but nothing major. I also don't mind having to wrap the successful result of a fn in Ok(...). I hope
235.
by rklaehn 6y ago
How is that different from aerocapture, which is what Starship is going to do? You are coming in at hyperbolic velocity and have to use the thin and very variable atmosphere to break into an orbit. At least the tether is completely predicta
236.
by rklaehn 6y ago
Yes, that is correct. But the end to end efficiency of Electricity -> H2 -> Electricity is much better than Electricity -> H2 -> CH4 -> Electricity. Hydrogen at 0°C and 100 Bar (~10MPa) has a density of 8.3447 kg/m^3. It
237.
by rklaehn 6y ago
For very large scale storage we are not talking about steel pressure vessels that are subject to hydrogen embrittlement, but depleted natural gas reservoirs which are just gas-tight geological formations and have no issues whatsoever with h
238.
by rklaehn 6y ago
That is a limitation of the pipeline infrastructure, because of hydrogen embrittlement of steel pipes. It is not a limitation of the large storage facilities, which are just exhausted natural gas wells and work just fine with hydrogen. The
239.
by rklaehn 6y ago
At small scale, this is correct. At very large scale, hydrogen is incredibly easy to store. You can just fill up and old depleted gas well and store terawatt-hours of energy easily. Germany has enough gas well storage to survive several mon
240.
by rklaehn 6y ago
This will work, obviously. But I don't see how it can be competitive with batteries. High energy density lithium batteries are currently being commoditized. They are also increasingly able to handle many thousands of cycles. E.g LiFePo

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