Methane >> carbon dioxide as a polyethylene/linear polymers feed stock. Double bonded oxygens are hella higher affinity than four loose hydrogens. Also as pointed out, even in a concentrated combustion effluent stack CO2 is low concentration at atmospheric pressure.
I don’t know about methane as an aromatic/hybridized ring building block. Anything is possible with chemical synthesis but is it energy feasible.
There’s always plant hydrocarbon feed stocks but I think using arable land to make plastics is dumb and also carbon intensive. (I do wear cotton clothing tho because you need to make trade offs).
Siemens has a collaboration with Porsche are piloting already eFuel production. Cost is super high (think like $10/liter). But thermodynamically feasible.
The carbon isn’t valuable elementally as much as it is structurally and molecularly. I mean that as aromatic rings and other ready made building blocks that conveniently can be fractionally separated with pressure and temperature conditions in a column as a gross generalization. All of this is energy intensive but much less so than building up from three atom molecules with strong bonds. And much much less energy intensive than separating a trace % molecule from the atmosphere at low atmospheric pressure and translating that to complex molecules.
There needs to be more appreciation for the laws of thermodynamics when discussing technology. Everything is not a 1-dimensional reduced abstraction.
The #1 rule of HN that must never be violated: software developers are the smartest people on earth, and literally every field could benefit from their definitely not stunningly overconfident and reductionist contributions. I dread threads about engineering subjects I get paid to be competent in because I can't handle the tsunami of neckbeard opinions that I'm about to see.
Don’t use hsv color wheel to intuit color space. CIE x,y $year_standard is superior to view color space and understand the tricolor values Z = f(X,Y) in every way.
Nah, I like organizing and packing my own bags to unpack into my refrigerator and pantry. And I appreciate the reprieve from small talk to the cashier or feeling the person behind me being inconvenienced by my slowness putting bags in the cart. Plus it helps me get a secondary feedback on relative costs of items in my cart. I’m all for self checkout as an awkward dude that appreciates some quiet time when shopping.
I go to wholefoods (self checkout) and trader joes (cashier) and other local branded stores with cashiers. I feel the least amount of rushed at wholefoods and the most at trader joes.
Edit - I hate the self checkout at home depot in my area where they show the facial recognition bounding boxes on the screen. Like I know that’s happening behind the scenes but home depot makes the whole experience so blatantly loss-prevention and customer profiling motivated vs a good transparent customer experience that I’ve made a point to go to smaller branded hardware stores.
Latitude may affect the eddy currents and resulting convective shear on the film surface imparted by angular momentum from the earth’s spin.
This is what humors me about analytical minded computation focused people vs dumb simple engineer and physics (practical) people. That is imagining all the infinities of what may change a physical result vs knowing by experience or education.
ANOVA: analysis of variance from linear fit parameters will show you in experimental data or simulation the contributing factors. Or you can read a chapter in an undergraduate heat transfer book.
Decay rate of (T(t) - T_inf)/(T(0) - T_inf) is probably dominated by the wind speed in your room. For an 8-12oz cup a sphere or cylinder will get you pretty close.
> all javascript on this website is optional (light/dark theme, particles background, and image lightboxing) and resides outside of the document body. localstorage is used to persist light/dark theme and mono/sans font state while surfing, as well as handle an over-18 check.
Hitting the reader mode of your favorite browser will help.
Usually it sounds like a weird advice and we'd want site owners to aim for readability...but TBH, blaming a site on a .pink domain on a page explaining the codepoints of an emoji flag to not be universally accessible seems beside the point.
Non-scientific anecdote here but I feel like the lawlessness is due to lack of enforcement for traffic violations vs an uptick in weed usage. Possibly covid scrambled our brains and promotes aggressive impulsive behavior. Maybe cops are afraid to pull people over because they might inadvertently shoot them and become a national news story. Maybe the adoption of big trucks makes people feel invincible (two distinct trucks on my drive have cut in line at a left turn lane with a red arrow and crossed 2 lanes opposing traffic at different lights, what would possess someone to do that(?))
Whatever the cause I feel in my gut that if our police did basic standards enforcement people would think twice about lawlessness. I’m in Pennsylvania.
Dandelions are really, really hard to eradicate by pulling. The roots grow very deep, and if you don't get them completely, the plant can re-grow from what's left.
Even if you do successfully get it out, it really is going to be more work than painting a weed killer on them.
My dad use to have my brother and I work for hours during the summer pulling dandelions in the lawn (to be fair he was out there with us doing it himself also). We each had a knife with about a 4" long blade, we would cut the root as deep as we could and pull the top out. Never really seemed to reduce the number we had.
It depends on the target and the surrounding soil. It’s often easier to pull especially for the random weed that sprouts up around your landscaping. However if you are trying to manage an infestation of invasive species, where the surrounding soil will have a seed bank heavily contaminated with seeds from the years of invasive reproduction, it’s usually a bad idea to merely pull. You can expose soil to sunlight and cause an explosion of dormant seeds. And some nasty invasives are nearly impossible to remove by hand because of their root structure — some species even leave little rhizomes broken off in the soil along the root structure when you pull off the foliage causing a hydra effect.
tl;dr targeted herbicide is a much less evolutionarily selected-for offense, as opposed to hand cultivation which mimics attacks plants have evolved to survive for eons
I think this says more about how much of our tasks and demonstrations of ability as developers revolve around boilerplate and design patterns than it does about the Cognitive abilities of modern LLMs.
I say this fully aware that a kitted out tech company will be using LLMs to write code more conformant to style and higher volume with greater test coverage than I am able to individually.
Sorry, that's what I meant to imply about off label use. I should have stated it explicitly.
Household cleaning one would otherwise moderate their exposure "by smell", so I'm comfortable trusting my sense of smell through an activated charcoal filter even though it's not a listed use, is past expiration, etc.
For things (eg painting with isocyanates), I follow the directions religiously.
I don’t know about methane as an aromatic/hybridized ring building block. Anything is possible with chemical synthesis but is it energy feasible.
There’s always plant hydrocarbon feed stocks but I think using arable land to make plastics is dumb and also carbon intensive. (I do wear cotton clothing tho because you need to make trade offs).
reply