I had to scan some historic books and papers for a research project and tried a couple desktop apps and python libraries. Still the Android scan to document worked better, so I just photographed all pages which was faster, then wrote an unsupervised python script to loop through the images in the camera folder and send them to Google Document AI for OCR, added some metadata and merged them. This outperformed the other even commercial solutions I tried by far and was dirt cheap.
If you're interested I'll clean up the code and put it on github.
- push-pull ventilation is easy to install and comparatively cheap
- it's prone to hygiene issues like blowing dirt out of the filters back into the air and providing a moist environment for microorganisms in some operational conditions
- it's prone to windy conditions
- the numbers stated by commercial vendors seem to have no basis in reality, there seems to be no vendor providing data based on the relevant testing standard for these systems. OPenERV states they want to get it tested by Passivehause institute but also say no lab data measured yet.
Might be just my counter-factual gut-feeling, maybe a mechanical window opener based on EspHome for short pulsed passive ventilation intervals is actually more efficient, easier to implement and need less maintenance? Not aware of any comparisons though and last time I checked I could only find some finicky 3d printed actors that might not survive a guest opening the window.
The TW4 is light years ahead. Higher flow, better efficiency, much quieter, wind compensation, Internet of things functionality. It's not just yet another machine of the same kind. The heat exchanger is very different, the whole design and construction is quite different.
Interesting reports of individuals turning their life upside down. Just don't understand how they account for confounders and seem to make carbs responsible for everything that went wrong before their transition. But since sometimes it's those individual reports that get people to take action, I don't judge, happy for everyone taking charge of their health.
There are many factors driving weigth loss or gain, the macronutrients per se seem to be irrelevant in the long term though: https://pubmed.ncbi.nlm.nih.gov/19246357/
There are health risks involved in low/no carb diets and the article mentions none of those.
Too much carbohydrate creates issues, but I think the real culprit is sugar. The science is pretty solid there. Refined sugar can border on toxic.
Close behind sugar would be heavily processed carbohydrates like white bleached flour, etc., which are not that much better.
But there are of course confounding factors. There are people who eat more of this stuff and are healthy, but they seem to get a lot of exercise. That probably helps in multiple ways including burning up extra sugar quickly.
I'd hypothesize that high carb and especially high sugar diets are really unhealthy when coupled with a more sedentary lifestyle.
I like your concept, can imagine it to look quite aesthetic.
Consider you need to create a fair pressure gradient between the two sides of the filter and it needs to be higher the more the filter clogs up. AFAIK radial fans are more efficient for that purpose. Downside is the noise.
If you are running the ceiling fan anyway just for the turbulence it creates on a hot day, it's probably fine even if just a small percentage of the airflow is pulled through the filters, your data certainly looks promising.
That’s why those filters are full of zigzags. The CFM/m² is very small, and so it can capture small particles instead of them zipping through. Also takes longer for them to clog up. Way longer than the oil change place wants you to think. The test of a dirty filter is that it looks dark when backlit, not when it is covered with surface lint. When they show your your filter, take it out of their hands.
From what I understood about how the system works in most European countries:
A test has a specific sensitivity and a rate of false positives. So for screening (CT in this case) you would want a high sensitivity and low cost, while the false positives would not be your priority. The positives should go through a confirming test (biopsy in this case) with a high specificity. Here cost and sensitivity are usually secondary.
Now insurers look at the screening tests rate of false positives. If they deem it too high, they don't want doctors to do those tests on a population with a low probability of having the condition you are screening for (low base rate). If the patient belongs to a subgroup shown to have a high enough base rate of a condition, then it makes sense to do the screening.
Then you have different patients, some want to get one MRI each year, some only want to run diagnostic after they experience symptoms. I believe most doctors respect that individual risk tolerance within the given framework.
Now the thresholds obviously should be revised regularly as cost, test properties and even base rates of diseases change, but I don't see a systemic defect here, my blind spot?
Starting an article with an emotional war picture makes me sceptical of the authors intentions.
IMHO he shrugs of the main issues without discussing in on the technical level you would expect for the risks involved here. He basically argues politics should trump engineering realities to cut corners. While this is usually fine in a startup environment, it's a bad idea for environments like space, healthcare, aviation or nuclear. We all know how it worked out for Boeing recently.
I would really like to see the numbers if you remove some of the heavy industry we don't need to keep running in Europe. This load removed, how much of the remaining base load throughout the hole year is really provided by gas, as this is the true load that could possibly be replaced by nuclear, from 2023 onwards if I may believe other comments.
I'm curious, but I find it hard to believe this would do anything for our friends in Ukraine NOW, so if this is our concern we should probably talk about other levers instead of recycling the nuclear debate.
Interesting details brought up here about location specifics.
At least in Zurich most ads contain an address. I fed it to google maps api to get the time by bike to my workplace which gave us some cheaper options we wouldn't have considered before. We also ended up taking/getting the one with the worst pictures.
Imagine someone would scrape all platforms for your city of choice and aggregate those with some value added and maybe automatically apply with your personal documents to make sure your application gets in first even when you're busy, what would it be worth to you? Despite local differences it might still scale.
