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lrasinen

411 karma · joined December 11, 2023

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lrasinen··on How Delhi cut electricity loss from 50 to 5 percent
Elering reports only their part, the very high voltage transmission losses. Then there are the distribution losses on the local level are they're about 4%.

https://www.ceer.eu/wp-content/uploads/2025/02/3rd-CEER-Repo...

lrasinen··on Replacing the old battery on rechargeable bike lights
There are also reflector pedals (see above for reliability etc)
lrasinen··on Unknown number of Texas voter registrations went unprocessed due to DPS error
The US doesn't have a population register in the same way as European countries do.

For reference, the Finnish voting experience is such that about a month before the election you get a card to your registered address, telling what the election is and what's your polling place. Then you show up on the day in question, show an ID, they check that against their list and off you go.

lrasinen··on Netherlands bracing for potentially devastating US sanctions against the ICC
ICC was established in 2002, hardly "in the aftermath."
lrasinen··on Black Holes or Black Hole Stars? Astronomers Spar over 'Little Red Dots'
Average density for non-uniform objects is pretty useless, since the cubic volume scaling makes a mess of things.

As an example, I pulled the stats for an electric locomotive. 19x3x4.4 meters, mass 90 metric tonnes. That's an average density of about 1/3rd of water.

lrasinen··on Canada welcomes EU proposal to become 'associate member'
Well, Finland's gonna insist on getting Celebrini in the trade.
lrasinen··on EU chief opens door for Canada to become 'associate member'
The main sponsor did not renew the sponsorship deal for next year, though.
lrasinen··on Suspected sabotage causes major Netherlands rail disruption
NOS thinks it's individual farmers getting a bit too frisky: https://nos.nl/artikel/2631141-boerenactivisten-mogelijk-ver...
lrasinen··on Google will buy half the electricity from one of Finland's nuclear power plants
The new planned datacenters aren't near major population centers, so potential for district heating might be limited. Eyeballing from the map one of them is about has about 25 km from Oulu (pop 200k), and another is 30 km from Kajaani (30k). But that's about it.

Edit: I was wrong, the locations do have small (5-10 MW) district heating networks.

lrasinen··on Ask HN: Resources to get good at soldering?
I'm going to put in a good word for the SN100C / Sn100+ / SnCuNiGe lead-free solder. It's been my go-to for the past 8 years or so, and it flows almost as nicely as leaded.
lrasinen··on Sweden pauses Denmark power cable over EU grid rules
Oh for Pete's sake, Sweden. Anything to avoid building more North-South connectivity.

Sweden is currently split into four pricing areas due to lack of grid capacity. All the cheap electricity is typically in the north (hydro) and then the price creeps up when you head south.

It's too bad the live electricity flow data is offline today, but there's a common pattern where SE1 pricing area in the north sends little under 2 GW to Finland (single zone) and most of it gets exported to SE3 around Stockholm.

lrasinen··on Show HN: We Implemented the IPv8 Internet-Draft in Linux, Libc, and BGP
There's precedent, IP over Avian Carriers was tested back in 2001.
lrasinen··on I stopped trusting USB-C cable labels and started testing them
The Treedix cable tester is awesome. Ordered one after reading Terence Eden's positive review* and went through all my cables the day it arrived. My favorite was the cable with only the ground connected; went immediately into the bin.

*) https://shkspr.mobi/blog/2025/06/gadget-review-treedix-usb-c...

lrasinen··on The Golden Age of British Ice Cream
Xanthan is the best if you need non-toxic slime for artistic purposes (e.g. Halloween decorations).

Just make a stiff gel and hit it with a stick blender for desired consistency and lumpiness. This does introduce a lot of small air bubbles in it, so if you need clear slime let it stand for a few hours.

lrasinen··on Decathlon Germany adds Wero payment option to decathlon.de website
"valuable asset for Europe", and it's available in 5 countries. Yay.

We already have a bunch of local non-interoperable systems, so what's one more?

lrasinen··on Future euro banknote design proposals
Sibelius was already in the last series of Finnish notes, so personally I'd pick Tove Jansson.
lrasinen··on Future euro banknote design proposals
I'm in the EU and you absolutely can put a French building on a banknote. I'd much rather look at the Eiffel tower or the Tower of Pisa or Neuschwanstein castle than the European Court of Auditors.

Or if you like to have something modern, Paimio Sanatorium or Turning Torso.

lrasinen··on A Beautiful Theory Falls to Ugly Data
The conjecture assumes durable goods, so it doesn't apply to medicine. Also no resale, so that narrows the scope even more.

The gist of the conjecture is that if the customers can wait out for price drops and the monopolist wants to sell their thing, then after a few rounds of "he knows that we know that..." the price ends up to be the marginal cost.

Now, real world disagrees with the model, so next steps are to examine why this happens and maybe discover some new economic interaction.

lrasinen··on Lessons from the Vasa Shipwreck
That's a bit unfair, since one of the achievements of Gustavus Adolphus was establishing governing institutions and professional bureucracy.

The bigger issue with that plan was be that the king was off fighting a war in Poland.

lrasinen··on Designing and assembling my first PCB
EU has Aisler but what you win in shipping times you lose in production lead time (unless you pay for faster service).

And there are probably others but with even less visibility / willingness to interact with private customers. Hell, I used to live next door to a sales office for a local PCB fab, but they never bothered to answer my inquiry about prototypes.

(That's another thing the proto-friendly companies do right: instant quotes without log-in requirement)

lrasinen··on What Ozempic does to the gut-brain axis
My personal experience is like getting eye glasses for your appetite. Easier to eat reasonably sized portions and they're nutritionally well-balanced.

Also the late night cravings are more specific: instead of vague "need to eat something", it's "I'd love a tomato" or "mmm yogurt" or "actually a load of carbs would hit the spot".

lrasinen··on Epidurals are a miracle technology
Got knee surgery with an epidural that leaked. The surgery itself went fine but the headache and nausea afterwards were absolutely brutal.
lrasinen··on 45°C cooling design cuts data center water use to near zero
55 C might be enough to heat buildings but it's right on the edge where domestic hot water needs to be to kill Legionella. So traditional DH systems need to run hotter.

There low-temp/cold DH systems out there that rely on heatpumps in the buildings to extract the heat. Less losses in the network and you can even use them for cooling, but needs heat pumps everywhere.

In comparison, a traditional heat exhanger is pretty simple technology; just a hunk of metal with a valve.

lrasinen··on 45°C cooling design cuts data center water use to near zero
Not yet, the Microsoft center is still in planning/construction.

But up north there's at least one city (Kajaani) on data center heat; details in another comment.

lrasinen··on 45°C cooling design cuts data center water use to near zero
Nice!

Apparently the local supercomputer cluster in Kajaani has also been hooked up in 2021 and is responsible for a fifth of heating.

lrasinen··on 45°C cooling design cuts data center water use to near zero
Microsoft's already building data centers hooked up to district heating (Espoo and Kirkkonummi, Finland). Heatpumps are amazing.

(Seasonal heat storage is also a thing, Espoo's neighbours have tens of GWh of storage, with a new 90 GWh cavern in the works. Not sure if the systems are interlinked.)

lrasinen··on The case against geometric algebra (2024)
And then there are us engineers. I don't care much either way whether Maxwell's equations are ∇F = J or some other form, as long as it makes the problem easier to solve.

If I were in the GA Marketing Committee I'd publish a paper with suitably hand-picked worked examples where the vector approach is long and tedious, and GA version is short and sweet.

lrasinen··on Denmark's wind and solar investments shield it from global energy turmoil
The electricity can flow both ways in a cable, and for example right now Denmark is exporting to most of its neighbours.

https://www.svk.se/om-kraftsystemet/kontrollrummet/ is a wonderful resource

lrasinen··on Clay PCB Tutorial
They're not great for anything that might produce heat. Seeing a MOSFET slowly starting to imitate the Tower of Pisa after dissipating a measly 1 W for a few moments was a sight to behold.

For about two seconds before I cut the power.

lrasinen··on Brunost: The Nynorsk Programming Language
Perhaps more inspired by the INTERCAL's PLEASE.
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