Has there been any research into why picrel happened?
>>16381173It's like society shut down around that time and instead of pointing that out, we're buying into another culture war about gender
>>16385856employers never fear employee lawsuits because employees can never afford better lawyers than the corporate ownership. employers only fear government lawyers intervening on behalf of employees, but that only happens when employers act against a government desire
>>16381173A significant portion of the men who required antidepressants now identify as women.Men became disillusioned with Big Pharma.Being able to WFH made social-anxiety men less reliant on antidepressants.
>>16382042So what?Thousands of people on antidepressants have killed themselves. Thousands of people going to therapy have killed themselves.Working out works for lots of men.
>>16383883The word you're looking for is psychology you retard
Previous thread: >>16334617 >what is /sqt/ for?Questions regarding maths and science. Also homework.>where do I go for advice?>>>/sci/scg or >>>/adv/>where do I go for other questions and requests?>>>/wsr/ >>>/g/sqt >>>/diy/sqt etc.>how do I post math symbols (Latex)?rentry.org/sci-latex-v1>a plain google search didn't return anything, is there anything else I should try before asking the question here?scholar.google.com>where can I search for proofs?proofwiki.org>where can I look up if the question has already been asked here?warosu.org/scieientei.xyz/sci>how do I optimize an image losslessly?trimage.orgpnggauntlet.comComment too long. Click here to view the full text.
>>16386444Never mind, I didn't consider that "not both true" also implies "both can be false"(T | T) | (T | T ) \ / F F \ / T
>>16385179Does the limit along the curve imply the actual limit is the same aswell though? Isn't it the opposite implication?
>>16386557To prove that the function is not continuous you need to find at least two curves with different limits. There are obvious ones that give a limit of 0 so you need to find one curve with a different limit like the one in >>16385179.
>>16386444This threw me for a loop at first because the bar is used for or nowadays but he seems to use it for nand
>>16386444u just substitute the previous equivalency of not (p and q) in for every p|q
Winter is cooming and my father is already shidding himself over Euro regulations when it comes to heating with solid fuels.He contacted a company that makes pic related which really looks like snake oil to me.It's an insert that you put into chimney and it supposedly:>increases heating efficiency (reduced fuel consumption) up to 40%>reduces various emissions such as carbon monoxide, NOx, various unspecified organic compounds, dust and more>Improves draft stability and improves resistance to wind back-draft>Blocks out rain so it doesn't rain down the chimney I can get two last lines as true, doesn't take a genius how it helps with those two things but the rest?I mean, how 4.2kg (9.25 freedom-units) of stainless steel sheet metal without moving parts is able to do all those miraculous things?Mind you, my boomer father is rather gullible when it comes to such things and instantly believes everything that is said on the internet, a trait which he carried over from TV.He was right though about few things, like starting fire in fireplace at the top which resulted in less soot and cleaning required, although no noticeable savings in fuel which he probably was mostly after.There's very little documentation on how this works provided by the producer. They do however supply buyers with bunch of papers that basically boil down to "the experts agree this thing works, here their stamp of approval". Nothing about their testing methodology in those papers though, just bunch of data.
>>16386238So you would expect this type of baffle to be optimizing air flow leaving the chimney which helps keep air feeding the fire and optimizing the burn temperature. In general, would that mean this is just stopping burping and other such things where air is pulled down into the chimney?
>>16386251OP here, that's what I'm askingInefficient burn of biomass implies it's burning incompletely due to lack of oxygen. It's why american Indians were making smoke signals by putting hides over fires (cutting oxygen supply and generating lots of smoke) and then letting the stored smoke go. Similarly If your cars engine is running rich, you can expect more smoke than usual out of exhaust pipe, same principle applies to fireplaces.It's why when the fireplace is just starting to be lit it creates the most smoke, it still has to warm up and insufficient heat creates incomplete combustion. If you want to increase the efficiency of burn, you should make your fireplace hotter. Increasing airflow seems like a straightforward thing to do until you realize that you're basically increasing the rate at which heat is leaving your home out of chimney.I believe this product is simply working on presumption that>improved draft stability = more airflow = more heat = more gooderbut the more I think about it the more I realize it's not as simple
>>16386202This is dependent on adjustability. If there isn't any adjustment happening then it won't be able to maximize fireplace efficiency. It can be too open or too closed for the desired fire intensity.
>>16386202I'm going to vote for scam.First off, the principle is right about combustion, but the place to fix that is in the hearth, that is why there are fireplace inserts with fans. The electric fan and sensors in the insert maximize combustion. Fireplace inserts work; I doubt doing anything at the top of the chimney has any effect. Secondly, when they made your chimney, the builder should have tested it for flow, and adjusted its height and bore accordingly. Unfortunately, most modern houses with fireplaces are made to be decorative, not effective, since the house is heated with a furnace, not a hearth. So, assuming the chimney flows properly -- which is dependent upon its height, and the flow of air in your neighborhood, and your builder -- your best bet for efficiency is an hearth insert, not something that is messing with the already maximized flow of your chimney.
>>16386694yeah that's what I'm thinkingbasically if fireplace and chimney was put together by someone competent (which usually means recently, not like a pre-war build) I doubt there's much to improve upon. Especially if there's thin or no smoke at all after fireplace fully warmed up since it signifies there's enough oxygen and heat for complete burn, meaning everything that could be turned into heat was turned into heat. Increased airflow in this situation decreases efficiency as now more hot air escapes trough chimney than it should.I think best investment here would be a roof cam pointed at chimney where I can see how much smoke goes out and adjust draft flaps in hearth appropriately.
Glow discharge editionPrevious thread: >>16233254>What is /ppg/?A thread for discussing plasma physics topics:>General plasma-related questions>Recent papers and developments>Fusion plasmas>Astrophysical plasmas>Low temperature and atmospheric plasmas>Complex/dusty plasmas>Plasma generation and processing>Plasma instrumentation and diagnostics>etc.Contributing papers, discussing research interests, and general effort-posting is encouraged. Suggestions for resources to add to the list are also welcome.
Neat that my annual scan of the catalog overlapped with this thread.>>16341133Yep. Alas I don't know physics so I'm just trusting the boffins. The going copium on stability is that various advances will make even shitty plasmas/pulsed operation economical (for a power plant). Or something like that.>>16325541Yep, I can see it as I eat lunch. Or the job site that'll become it, anyway.The YouTube channel has a surprising amount of footage, by the way, including plenty of aerial shots, so you don't have to trust me. Certainly a lot of activity (as you can tell from the videos).
>>16378774Chen is pretty good. It's not exhaustive, but it's a good general summary of topics, and he's pretty approachable in how he presents the content.Piel is more graduate level. He's more exhaustive on topics, particularly fusion, but he also tends to do that same skipping of 'trivially obvious' steps that Jackson does in Electrodynamics that irks me. Still a good text though.Gurnett's actually pretty underrated. His book focuses more on space stuff and waves, but it's got some good introductory chapters as well.
>>16383339thank youI have Chen's book and I appreciated it (as an engineer, not physicist).Maybe I will challenge myself with the others later.
>>16382591glad for /ppg/ its nice to have more generals on /sci/ since most of the other threads are dog shit for actual discussion unless they are in general format
bump
If a colony of modern humans (as in, more than enough of them to sustain a stable non-interbreeding population) were transported to a copy of Earth that is more or less identical to ours minus any existing human civilisation or technology, supplied with the collective knowledge of every technological advancement from fire to the modern day, how short a time could it take them to manufacture a single smartphone?This is a theoretical situation where there's no infighting, cultural divisions, natural disasters, plagues or whatever to significantly hinder their work, and they aren't being forced to work unhealthy amounts of time every day.For example, with the right knowledge of materials and how to use them it's possible to set up furnaces and basic smelting 'equipment' within a week, even a day with a lot of people working on them, but you won't exactly be able to make precision instruments immediately.
>>16383125is the guy in the picture on board? then yes.
>>16383125An important number is missing: how many of them.Before making smartphones they would have to first build the infrastructure for their living necessities, housing water food etc. Only after that you can have minining and furnaces for metals, plastics production, a huge variety of materials and tools, I don't think you realize how diversified is the industrial production, and it's all needed.Even if they are millions of people it would take at least decades before having microelectronics, with just a few thousands there is simply no way. They first need to grow in number and conserve the knowledge.
>>16383125Depends a lot on how educated they were, carrying a bunch of books wont do much. Most people in this so-called colony will have to busy themselves with hunting and building somewhat in excess of their own needs, to support a smaller group of people that needs to work in these technological projects full time.Normally they would organize this with a bank. They would set up a market to sell their squirrel meat, and the proceeds saved in a bank, which could decide then to fund tech startups, such as "copper"
>>16384338Also modern minning has discovered and used up all the near surface ores and oil, so unless this scenario is of an 'untouched' planet it would be significantly harder to aquire most metals and hydrocarbons. Oil used to give a ratio of 1:30 energy return per drilling investment, today it is more like 1:7
>>16383125>If a colony of modern humans (as in, more than enough of them to sustain a stable non-interbreeding population) were transported to a copy of Earth that is more or less identical to ours minus any existing human civilisation or technology, supplied with the collective knowledge of every technological advancement from fire to the modern day, how short a time could it take them to manufacture a single smartphone?We have this discussion regularly.Last time, it was estimated stone age to atomic age in 50 years, and the rest mostly as it evolved. That makes for 100 - 150 years.
Why is it ok for scientific theories to so badly contradict history?Can we really afford to think that people of the past were just stupid and had nothing to teach us?
>>16386642Smart =/= no knowledge>Be high IQ>Live life never being presented with a book or writing>Your entire education is from retired war general elders who teach you oral myths >Use that high IQ to maybe design a nice house in the forest>Die never understanding geometry, gravity or electricityThis is why immortality would be based. Humans with multiple lifetimes of exposure would be able to notice things about the world they would never be capable of in just 80 years
>>16386673Written history anon Science contradicts written history
>>16386642You are generalizing. Give an example worth discussing.
>>16386685Maybe the history of your third world shithole is false?
>>16386700If you knew history you would know exactly what I was talking about sad
Hermetic pathology editionPrevious: >>16351484We discuss research, DO NOT offer medical advice (just fucking go see your doctor), make fun of premeds and shitpost.Keep vaccination/clamping/vitamin K/soliciting advice out of this thread and start your own because it takes a lot of space.
Medical history loreThe seven causes of disease according to Hermetic philosophers:>1. Evil spirits>2. Disjunction between spiritual and material natures of an individual>3. Unhealthy or abnormal mental attitudes>4. The Law of Compensation AKA Karma>5. Motion and aspects of the heavenly bodies>6. Misuse of a faculty or organ>7. Presence of foreign substances in the body as well as obstruction
The Hermetic philosophers also had seven forms of therapy:>1. Exorcism of evil spirits>2. Healing by vibration (music and colour)>3. Channelling of the planets in talismans of different metals>4. Channelling of the planets in herbs for consumption>5. Prayer>6. Regulation of diet and daily habits>7. Practical medicine such as bleedingDiscuss.
i fucking hate Gaylen. he fucked ober medicine for millenia.
Radbros, any advice on making a program list? It's hard to know which places are reaches vs targets these days since residency explorer decided to fuck everyone and just not show us the relevant data anymore.
Male science only
>>16385114This low IQ board is not interested in math
>>16385200>Male science only>not interested in math>mathNice math thread you fucking dipshit
I never have time to learn math. I can decide if I want to learn more math or publish one more paper per year. Witten said something about Geometric Langlands.https://arxiv.org/pdf/hep-th/0604151But it's unrelated to my work so I can't afford to spend time on it...
>>16385200You could have added to the discussion instead of becoming a worthless meta baby on a thread less than five minutes old.
Dividing vectors like this isn't a "standard" notation but there's no good reason for it not to be.
>>16386532A notational convention along those lines could definitely be reasonable in some setting, although it might not have all the properties you might want from a division operation over a field. E.g. a vector space with a division operation would not form a field, because even when the notation is well defined*, the result of performing the operation is not another element of the vector space you're working in, but rather just a scalar in the underlying field of scalars. *Moreover, the operation will not always be well defined, since e.g. there may not be a unique scalar whose product with B is closest to A. E.g. if you vector space is not topologically complete, and we we can find a sequence of scalars c_1, c_2, ... whose product c_i B --> A converges to A in the limit but never actually reaches it.
>>16386532>closest to Adefine "closest" in terms of vectorspace axioms.you'll find out that vectorspaces by themselves don't have enough structure to define closest beyond things being exactly equal to each other (i.e. their difference is the 0 vector).you need to at least introduce a norm.
>>16386580>you need to at least introduce a norm.And the relationship between normed spaces (a topological concept) and division operations (an algebraic concept) is actually a pretty important topic in math and physics. There are a number of similar theorems addressing these matters, e.g. Hurwicz theorem tells us that the only real-valued, normed division algebras are the reals, the complex numbers, the quarternions, and the octonions. See https://en.wikipedia.org/wiki/Hurwitz%27s_theorem_(composition_algebras)See also Frobenius' Theorem for a related concepthttps://en.wikipedia.org/wiki/Frobenius_theorem_(real_division_algebras)
My initial goal was to use this in [math]\mathbb{R}^n[/math] with the usual Euclidean norm to help motivate the dot product for people encountering the first time. Not original, this is done in the "new math" era text "A Vector Approach to Euclidean Geometry" with different notation. But it would certainly be interesting to explore which normed vector spaces this operation is defined in, and how it behaves in those spaces.>>16386622This is definitely not the sort of division you have in a division algebra, because it has a remainder like integer division does.
>This is definitely not the sort of division you have in a division algebra, because it has a remainder like integer division does.Although it is notable that it's the scalar part of quaternion division.
I'm in incredible pain every time I eat and I don't know what it is. Here's a picture of hospital food. The left side of my head has a burning migraine after I eat food and lasts as long as there's food in my stomach. Does anyone have any ideas?
>>16386620Shit, please hang in there man. I don't know what it is but that sounds like some sort of inflammation or allergic reaction. I was in a similar situation as you a few years ago. hope they're giving you anti inflammatories.
what are the mathematical preliminaries and prerequisites to fully comprehend calculus of variations and optimal control theory?
Why don’t modern day scientists know what philosophy is? Do they not realize that theoretical physicists can’t avoid taking philosophical positions?Also, why is semantics killing science?
>>16384742>Why don’t modern day scientists know what philosophy is?assertion without a proof or source.>Do they not realize that theoretical physicists can’t avoid taking philosophical positions?assertion without a proof or source.insinuation physicists wouldnt philosophize.>Also, why is semantics killing science?assertion without a proof or source.
>>16386285I farted
Scientists don’t even realize how much they look like evil wizards.
>>16385646There's no point in questioning the truth, only the false should be questioned, that's why religion lost.
>>16384742Why can't scientists learn some graphic design if they're so smart?
I saw this was done successfully in mice so I tried it on myself. Ofc this is the cheap version with mustard since I don't have 20+ bucks to spare for concentrated tartrazine.But yea if some of you madlads wanna try this, just rub yellow food coloring in your skin and it should become see-through.Works way better in mice due to their skin thickness and my crappy ingredient.Here's the experiment video I only got 4 views lol. https://www.youtube.com/watch?v=daMrb7X8PHM
>>16384364if cheeto dust makes us transparent why aren't cheeto fingers see-thru?
>>16386499You need to make it a fluid Post pics if you do I'm interested to see if it'll work better in higher concentration
>>16385116literally just watch my other videos :D
>>16386468female lol
>>16384364Not falling for that trick again!
What if Mars looked like this?
>>16384378if you were to terraform the moon would it remove it's mystic powers?
>>16384747If we in the distant part could see lunar cities lighting up at night, it would be even more mysterious. Imagine seeing another civilisation but not being able to reach them for millennia?On the other hand, the romantic powers would instantly double if we had a second moon, perhaps also one orbiting the moon. And with a ring like Saturn, the Zen would be off the charts.
>>16379589Fpbp
>>16384375Literal wet dream for any pirate autist get me a ship and drop me off, it doesn't even have to be rocket powered
>>16386199venus with an earthlike surface and atmosphere would be warmer too, infinite carribean
Are there any known scientists who are also gnostics?
>>16375176Depends what you're saying here. There are varieties of mathematical Platonist who might claim "Of course, a perfect circle isn't physically realizable," while still maintaining the existence of one or many perfect circles. This is a gnostic tendency that is maybe saved from outright gnosticism by certain beliefs about how we process sensory data or how the universe itself came into being. You can draw a dotted line either way.
>>16377247lmao it looks just like him
>>16382592and yet she exists and people jerk off to her bikini photos
>>16360519I don't know about the egg chair but the eames chair is a famous chair that's frequently knocked off. You can get an imitation for a few hundred
>>16366393
