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chuckledog

253 karma · joined February 4, 2011

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chuckledog··on War and subsidies have turbocharged the green transition
We remodeled to tight envelope + radiant heat but our architect failed to spec fresh air ventilation. We had to DIY it mid remodel and learned a lot in a hurry.

The one room that we didn’t get any fresh air flow to, now stinks. The others are fine.

In a nutshell: blow fresh air into bedrooms / closets. 10 CFM is enough (small cpu fan level of airflow). Exhaust with quiet bathroom fans on constantly at low CFM. In + out = flow. Rooms with no flow = stinky, musty, germ contamination, good for growing mushrooms, bad for people and pets

chuckledog··on The Match Girls
Just saw it. Good movie and history lesson
chuckledog··on A Last Gasp of 2D: The Cave CV1000
Great site. Takes me right back to the 8 bit days!
chuckledog··on My goal of closing 10% of Emacs bugs (2020)
Looks like since this was posted, the page author has closed another 10% of open emacs bugs: https://lars.ingebrigtsen.no/2022/01/20/13x10/
chuckledog··on The forty-year programmer
Great article. As another 40 year programmer I strongly agree with the “software is young” sentiment. Coding is fun but the way we tend to go about it is insanely boneheaded! I was in the Computer History museum in Santa Clara the other day (awesome place) which maybe provided some perspective. We haven’t really come all that far from the punch cards era, we’ve certainly added a lot of talent and people, but the punch cards are still essentially unchanged. Consider:

- the interface for telling a computer what to do is still a “text editor”, barely changed since 1980. Basically, a bigger punchcard. We’re still arguing about whether 120 columns is better than 80. Scratch’s blocks are a hint of fresh air but only the kids use this

- code execution is still totally decoupled from code creation. We use insanely rich compilers to “talk” to our machines, but pretty much nothing to “listen” to them. We “log” things then ignore the logs. There’s no way to tell how often a line of code has been run, or what the universe of values has been for a given variable, short of digging into an awkward field called “tracing”. Borland Turbo Pascal offered live code tracing 40 years ago (Ctrl-N to execute to the next line) but nobody has meaningfully improved upon it.

I don’t mean to gripe — we’ve accomplished so much with these and the other simple metaphors —- but they do reinforce the idea that the software field is still very young.

chuckledog··on MySQL Raytracer
Imperative and eschewing of newlines… maybe change the subject line here to “25-line MySQL Raytracer” ;D
chuckledog··on Engineer turns plastic into bricks that are reportedly stronger than concrete
Article states this is “plastic that otherwise would be dumped in the city’s overflowing garbage heaps.” Environmental impact of these plastics should be weighed relative to the impact of those same plastics sitting in said garbage heaps. It’s likely safer sequestered in a processed brick optimized for durability than it would be rapidly degrading from e.g. thin plastic bag material into microplastics leaching into the soils and water tables around the dump.
chuckledog··on Detailed Assemblies for an Airtight Small Home
To have your tight house (and your family) breathe properly you’ll want to couple your smart bathroom exhaust fans with filtered air intakes. HRV/ERVs can do this but are overkill in many mild climates. A set of simple fan+filter pairs does the trick for us, can’t believe we lived so many years in poor ventilation.
chuckledog··on A Concise History of (Television) Test Cards
The PM5544 brings me back to many a late night long ago. When every one of the 16 channels (where I lived at the time) showed one of these patterns, you knew it was time to go to bed…
chuckledog··on Switching to an N95 mask gives a 75x boost in Covid protection
That’s what I tell my kids (tweens): if you could smell their fart, you could catch their COVID.
chuckledog··on Switching to an N95 mask gives a 75x boost in Covid protection
Def liking my new kf94’s
chuckledog··on The humble water heater could be the savior of our energy infrastructure woes
Yes and add to that the ability of many of these large-battery vehicles to self-drive. For example when the owner is working during the day, the vehicle could drive to a regional charging station. This could help with the distribution component e.g. in rural areas with no power lines for the last few miles — the vehicle simply drives the power from where it’s available to where it’s needed.
chuckledog··on The Decadent Society: How We Became the Victims of Our Own Success
Awesome to hear Kargyraa throatsinging again! Hadn’t heard this since Paul Pena / Genghis Blues. Music transcends culture...
chuckledog··on Ask HN: Irradiation to reuse surgical masks?
Effects of Ultraviolet Germicidal Irradiation (UVGI) on N95 Respirator Filtration Performance and Structural Integrity, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699414/

NYTimes.com: As Coronavirus Looms, Mask Shortage Gives Rise to Startling Solution, https://nyti.ms/3b8C1HQ

chuckledog··on Why N95 masks are hard to make
@jennyyang did you make your UVC setup yet? Here is what I wound up with over the weekend https://twitter.com/choser/status/1241933729536200709?s=21 I also found the system a bit hazardous and am treating it with more respect now. It seems pretty powerful even at 13W. I was sterilizing my masks for 2 hours, now am just doing one minute per side.
chuckledog··on Why N95 masks are hard to make
Yes and there is another commercial product that uses UV-C light to sterilize baby pacifiers:

https://www.amazon.com/Munchkin-Portable-Sterilizer-Viruses-...

chuckledog··on Why N95 masks are hard to make
Agreed. The use case I am hoping to help solve for is health care workers (eg. Nursing home aides) who have a very limited supply of N95 masks that they wind up having to re-use for multiple days / weeks at a stretch. If they have access to a quick affective way to sterilize them without ruining them (I like the microwave idea too) then they can stay healthier, and their patients can stay healthier.
chuckledog··on Why N95 masks are hard to make
Browsing Amazon, it seems that there are some UVC bulbs that specifically avoid ozone creation. Other variants are marked “with ozone”, and for some reason both variants typically cost the same. I bought one “no ozone” and plan to put it in inside a reflective “pouch” (actually just a silver lined grocery carrier) for sterilizing things without exposing anything outside the bag to the UVC light.
chuckledog··on Why N95 masks are hard to make
There is quite is quite a bit of information readily available about sterilizing disposable N95 masks with UV-C light. While not nearly as good as a fresh mask, this might be a preferable alternative to reusing the same mask unsterilized.

https://www.ajicjournal.org/article/S0196-6553(18)30140-8/pd...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699414/

https://www.peakprosperity.com/forum-topic/can-uv-light-disi...

The UV light needs to have a wavelength around 260nm (shorter wavelength than standard UV light). Such UVC lamps are cheap and readily available, commonly used in consumer products for aquarium water sterilization and air purification. Example replacement bulb: GermGuardian LB4000 GENUINE UV-C Replacement Bulb for AC4300BPTCA, AC4825, AC4850PT & AC4900CA Germ Guardian Air Purifiers https://www.amazon.com/dp/B0055522F6/ref=cm_sw_r_cp_api_i_4D...

chuckledog··on Ask HN: Sterilizing used N95 respirators with UVC light?
OP comment: Here's a link that supports the idea https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699414/

Also clickable links for the Amazon items mentioned in the post:

https://www.amazon.com/Light-Clean-Ozone-minutes-Capacity/dp...

https://www.amazon.com/gp/product/B00FB140TU/ref=ppx_yo_dt_b...

chuckledog··on How to Work During a Pandemic
Agreed
chuckledog··on Doing: CLI tool for remembering what you were doing and tracking what's done
Looks very helpful. It would be great to hear a testimonial from anyone using this in their everyday workflow.
chuckledog··on Hundreds of dogs in Norway hit by mystery illness
This does sound awfully similar to the plot of https://en.m.wikipedia.org/wiki/The_Thing_(1982_film) —- ancient/alien parasitic organism buried in thawing Norwegian permafrost affecting a sled dog ... also reminded me of the recent warnings of bacteria in permafrost e.g. https://link.springer.com/chapter/10.1007/978-3-540-74335-4_... ... of course this is an idle association and apologies to all the real dog owners whose dogs are ill from this very real disease.
chuckledog··on Crazy LORA ranges today
OP observed up to 20x that range https://www.distancefromto.net/distance-from-sheffield-gb-to...
chuckledog··on Crazy LORA ranges today
Some context: LoRa is a new, private and spread-spectrum modulation technique which allows sending data at extremely low data-rates to extremely long ranges. The low data-rate (down to few bytes per second) and LoRa modulation lead to very low receiver sensitivity (down to -134 dBm), which combined to an output power of +14 dBm means extremely large link budgets: up to 148 dB., what means more than 22km (13.6 miles) in LOS links and up to 2km (1.2miles) in NLOS links in urban environment (going through buildings).

From https://www.cooking-hacks.com/documentation/tutorials/extrem...

chuckledog··on Gary Gygax Memorial
Gary Gygax Memorial Lake Geneva, WI 53147 https://goo.gl/maps/dP5B9GqqBvnY6Pup7
chuckledog··on Hayabusa 2 rovers send new images from Ryugu surface
すごいよ Sugoiyo! Super! Cool! Wow! Awesome achievement Japan.

I really admire that its means of propulsion doesn’t involve wheels (since the gravity is so low)

chuckledog··on A cheap way of storing information in DNA
Article is a bit light on the “how” part. Found this over at https://www.wired.com/story/the-rise-of-dna-data-storage/ :

“What Catalog does, instead, is cheaply generate large quantities of just a few different DNA molecules, none longer than 30 base pairs. Then it uses billions of enzymatic reactions to encode information into the recombination patterns of those prefab bits of DNA. Instead of mapping one bit to one base pair, bits are arranged in multidimensional matrices, and sets of molecules represent their locations in each matrix.”

chuckledog··on Rotor sail helps Finnish ferry Viking Grace reduce fuel consumption
Some of the rotors are retractable.
chuckledog··on Rotor sail helps Finnish ferry Viking Grace reduce fuel consumption
Wikipedia link: https://en.m.wikipedia.org/wiki/Rotor_ship “Flettner constructed an experimental rotor vessel; October 1924”... Not practical. Renewed interest this century, improved design. New ships: Viking Line to reduce fuel consumption up to 15%. Maersk to start testing 2018. Norsepower to cut 7-10% of fuel cost in big tankers.
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