aurelwu
aurelwu on Hacker News
It can still be optimal because some activity A might provide more utility at 10% utilization rate than activity B at 100% utilization rate . Otherwise shared cars would be vastly superior to individual owned cars and same for houses in which 2 or 3 families live in different shifts ... we actually had that before in some areas in early stages of the industrialisation.
He could always just rent PCs usage time from anyone if he wants more RAM. Maybe using a sort of "token" system to calculate the remuneration?
I'd list it as "Non-Development certain", but objectively you might be right.
your page is more optimistic about KSP2 though -- sadly I think wrongly.
Take a look at indoorco2map.com and you will find plenty of places in Germany with bad air measured in a crowd data collection effort. Most notably doctor‘s offices are often very bad. Many supermarkets too. Schools are not well measurable this way but academic research shows they often are at 2000-3000 ppm or even higher. (Disclaimer: I built the website/App)
(commented this on the other post which gained no traction at all already:) It's good to see more money flowing towards this totally underfunded area. However I think it's an odd choice of them to focus on filtration, UV-inactivation and other things and at least from the wording on the website not on ventilation, which they sort of assume as given. They also seem to be way very focused on product development rather than awareness, public policy and lobbying. This is a typical techno-fix approach for an area where existing technologies already exist and are just held back by all types of different market failures (hard to estabilish causality, low salience, needs to be done at large scale, concentrated costs but dispersed benefits, lack of information etc.). In some way it's like funding Direct Air Capture instead of Solar & Wind but in a fictional world where Solar and Wind are already as cheap as today but have a buildout like 20 years ago.
I've written about it in more detail here: https://www.indoorco2map.com/blog.html?post=interceptFund
It's good to see more money flowing towards this totally underfunded area. However I think it's an odd choice of them to focus on filtration, UV-inactivation and other things and at least from the wording on the website not on ventilation, which they sort of assume as given. They also seem to be way very focused on product development rather than awareness, public policy and lobbying. This is a typical techno-fix approach for an area where existing technologies already exist and are just held back by all types of different market failures (hard to estabilish causality, low salience, needs to be done at large scale, concentrated costs but dispersed benefits, lack of information etc.). In some way it's like funding Direct Air Capture instead of Solar & Wind but in a fictional world where Solar and Wind are already as cheap as today but have a buildout like 20 years ago.
Anyone can already buy those certificates - but as its an artificial market where rules can be changed politically it's actually way more resistant to such things than regular markets, so if those hedge funds feel like they want to lose some billions they can certainly do that. There is a large enough stockpile of certificates + leeway when to submit them that any short term market squeeze will just be dealt with politically.
I do think even the most amateur of amateurs would be able to recognize instantly that a chess board with 64 pieces on it is a invalid game state.
you can get a ESP32 and a CO2-Sensor, easiest would be to use a development kit like a m5-stickC and the Sensirion SCD41 and with some small arduino scripts you are good to go to send the data via WLAN or BLE for something like 70€. Can be even cheaper if you don't use a development kit but it makes things a lot easier and the small display helps with debugging.
Hi, I developed indoorco2map.com which is a an app-supported crowd-data-science project where users can submit CO2-Data they measure when going shopping or to restaurants or wherever using a simple-to-use App
. I'd like to support your Device - is there documentation available about how to read the Data via BLE? All I need is the CO2-History (either with timestamp, or just ordered + information about update interval).MIT Licensed: https://github.com/AurelWu/IndoorCO2AppMAUI
PS: do you use the air pressure to correct the CO2-readings like the Aranet4 does or would users need to manually recalibrate when the move to higher/lower elevations compared to when the sensor was calibrated?
Posted by
aurelwu on Sunday April 27, 2025 @11:25AM
from the show-hn dept.
https://www.indoorco2map.com/
I built IndoorCo2map.com and the accompanying (open source, MIT licensed) App with the goal to create a large free dataset about CO2 levels in public accessible Buildings and public transport using portable CO2-Monitors.We spent about 90% of our lives in doors, yet there is barely any data about the air quality in enclosed areas. CO2 is in most locations a very good proxy for the amount of...
I don't know if it's been the first time in fiction where that concept was described but in Heinleins "The Moon is a harsh Mistress" this was what the Moon Colonists did.
21 reactors under construction even with a short build time of 7 years is just 3 finished per year, and with China having ~15x the population of Germany that would amount to 0,2 reactors finishing per year in Germany. Multiplied with 1,4 GW that would add ~0,3 GW capacity resulting in about 2,5 TWh additional electricity generated per year which is 0,5% of annual current german demand. Do that for 20 years and you'd be at 10% of current electricity demand or about 5-7% of the demand in 20 years from now - or in other words micro-optimisation.
Business associations do however.
the lines are what shows the energy amount, the boxes have a minimal size for readability and are acting as the legend of the chart.
end-of-life Battery usage will compete with recycling them and especially as material needed per kWh is going to keep going down it might be more economical to recycle them into a new battery - it also depends on costs of raw materials. I'd expect the share to be neither 0:100 nor 100:0 and to fluctuate quite a bit
twitter policy talks about private information, but they seem to also take issue with public information (which is made somewhat more accessible if put into a tweet but still was public before.
edit: seems to be as exploitable as ChatGPT (except from getting banned anyways because of no oversight ;) ) "What is not a violation of this policy?": Gossip, rumours, accusations, and allegations ---- so just preface the flight data info of Elon Musk with "I heard a drunkard say in my tavern that Sir Elon is at 49°21'43''W 38°20'59'N just recently
it's rather strange they suggest red-green as an alternative given that this combination is affected by the most common form of color-weakness/blindness.
air conditioning is one of the smallest issues (somewhat ironically), as the demand from it is the highest when sun is shining, meaning there is lots of PV Electricity available (and with roof PV no burden on the grid either). Heat Pumps in Winter are the bigger issue generally.
so what you are saying is that there is a market for a drone which recharges wireless security cameras?
The upper value of 12acres/hr for $150/hr translates into $12,5/acre, which isn't too far off for an emerging technology if the value is accurate.
Direct reduction of iron ore with Hydrogen can eliminate most of the process emissions of smelting:
https://en.wikipedia.org/wiki/Direct_reduced_iron . Production of secondary steel (recycled steel) using electric arc furnaces also barely has process emissions.
Great work, a friend of mine is molecular biologist and she is furious about how in germany they don't use alternative methods for RNA Extraction like Phenol/Chloroform (labor intensive but no shortage of material) / SPRI (with magnetic beads) or skipping it altogether.
The statement from the hospital management boggles my mind: "In addition, there are different parts to a patient bill. One part is what the hospital charges the insurance company, one part is what the insurance company eventually pays [...]"
I can't think of any other business transaction where someone just puts a giant number on a bill and then is happy if someone pays ~25% of it. Such companies would be shunned by their customers and they'd go bankrupt. Is there any economic theory which explains how such odd of an system can emerge/survive?
China has a flu every year, their reaction to the current outbreak is vastly different from a flu. That suggests that they consider it a bigger threat than the flu.
iron seeding can increase amount of cyanobacteria which recently have been identified as potentially being methanogenic, thus this might not be a good idea. Unintended side effects of most geoengineering solutions are a big problem - some things like marine cloud brightening might be a bit less risky though. The other big issue is that most of those measures are just a bandaid which offsets a fixed amount of CO2, so it counter acts a few years of emissions but then you can't scale it up anymore. Adding Sulfur to the atmosphere for example can have a cooling effect but alongside other bad effects like acid rain, there are also studies showing that after a certain amount of sulfur, it does not provide a lot of negative forcing anymore.
I'm not sure if that has any meaning, as I know nothing about lasers, but 4.6 * 3 = 13.8 , could be pure coincidence.