Sensei

Collapse of civilization can cause lost of knowledge. It's plausible. It happened couple times already. They're known as "dark ages", Greek dark ages, because there is no written records (or in very limited quantity) what happened in that times.. Information from ancient times, and history were stored traditionally on stones (it can survive quite a lot, but has limited capacity and quantity of copies), later replaced by paper (quite vulnerable, won't survive inappropriate environment, too large humidity etc. but can be used to heat room in cold winter..), now we have digital data stored on tapes (you can't even read tapes from '80 years the most likely), data stored on CD, DVD, Blu-ray.. They are practicability not readable without enormous amount of knowledge and/or device designed to read them, thus way far more vulnerable to be lost (by which I understand "unable to be read/understood/decoded anymore") in the case hypothetical collapse of civilization.. Store data in PDF, and imagine that you have no PDF reader anymore, and you're pretty much screwed... It's pretty hard to decode file-format, it can use different compression algorithms for different object streams (I wrote (pretty basic) PDF reader, terminology from file-format specification). It can have embedded image files (from scanner). Language of human evolves with time. Introducing yet another way of losing data because inability to read even not compressed raw text, in in the future, unknown language.

There can be created (or modified already existing one) electric tractors.. There can be made tractors using ethanol/methanol as fuel, which can be produced from remains of agricultural production even by farmers by them self and being self sustainable. Collapse of civilization does not necessarily means immediate lost of knowledge. Knowledge will be the most valuable thing you can have.

These people are mostly not interested in politics. They knew him only as celebrity, as TV presenter, as businessman, and judge him from this side..

Not only. Two stars are made of matter in plasma state. And there is center of mass of binary star system. There is center of mass of Solar system etc.

What does it mean to you "move like particle"... "move like wave"... ? Matter-wave (aka "Broglie wavelength") is calculated from kinetic energy/momentum of matter-particle. Photon-wave is calculated from energy of photon particle [math]\lambda = \frac{h c}{E}[/math] From cumulative interactions between particles there is produced wave-like pattern effect like in interference or diffraction.

Proton is stable only when it's free particle. Two (or more) bound together protons, e.g. extremely unstable nucleus of Helium-2, can decay via beta decay plus, emitting positron and electron neutrino, and release energy in this process. [math]_2^2 He^{+2} \rightarrow D^+ + e^+ + v_e[/math] https://en.wikipedia.org/wiki/Isotopes_of_helium#Helium-2_(diproton) If you're more interested read Wikipedia article about beta decay plus (aka "positron emission"): https://en.wikipedia.org/wiki/Positron_emission This decay mode is allowed only in proton-rich unstable isotopes. Protons fuse together, creating bound to nucleus neutron(s). Nucleus can be destroyed (e.g. photodisintegration , artificial induced radioactivity ) and it will liberate free neutrons (or protons, or other particles). Newly created neutrons can be e.g. captured , scattered , or decay . If we will replace proton by antiproton, and try to fuse them together, we should get exactly symmetrical reaction i.e. [math]p^- + p^- \rightarrow D^- + e^- + \bar{v}_e[/math] (prior fusion you had proton (or antiproton), after fusion, you don't have proton (or antiproton) anymore! There is bound neutron/antineutron instead) It's important, to explain why and how, there are formed chemical bounds between different atoms. e.g. why there is H2 molecule (not H alone), why He, Ne, Ar, Kr, Xe are monoatomic gases, etc. etc. Elementary charge (e) is also quantum number.

Are you expert in this specialized field by yourself.. ?

You used here -M and +M.. Does it mean negative mass and positive mass.. ? Antimatter does not have negative mass.. For example, if you have typical pair production, energy of gamma photon is 1.022 MeV prior pair production, after we have electron with rest-mass 510998.928 eV/c^2 and positron also with rest-mass 510998.928 eV/c^2. Sum of rest-masses of particle and antiparticle, multiplied by c^2, is equal to energy of gamma photon, prior reaction. If rest-mass of antiparticle would be negative, sum of their energies would be equal to 0.

It was annihilation channels of proton-antiproton at rest prior annihilation. Rules of speculation section of this forum is that the only creator of thread is speculating, and the all other members of forum are using well-tested mainstream physics to answer questions and point out any problems. If somebody would start debating, it could be treated as thread hijacking, if he/she will be making his/her own model of sub-particles (building "bricks" of regular particles). We should start from: - what are charges of your sub-particles? - what are masses (rest-masses?) of your sub-particles? - what are other quantum numbers of your sub-particles.. ? - what are other properties of your sub-particles.. ?

Make computer script. It should connect to atomic Internet clock (google: "atomic internet clock time" e.g. https://time.is/ or "International Atomic Time"), and at the same time take local computer clock, and store them somewhere, then wait quite a long period of time e.g. 24h and repeat readings. If they are different, you will be able to calculate loss per day, loss per hour, or loss per second.. Computers/smartphones/tablets can be manually or automatically synchronized to "time servers". Google "how to synchronize time server android" (or replace Android by other OS name).

We have too little data to make any judgment. That's why I asked to use IR camera to check temperatures inside house and outside, in the worst cases.. It's plausible. John Jeffkins didn't say which country, which state, he is living.. Something which works good in Canada, or Europe, not necessarily will work in Florida or Texas, or Mexico etc. etc. But how manufacturer will learn about it.. ? The most likely only from customers experiences.. That's what I said in the first row of my the first reply "I agree. There is too few UV photons alone to cause such effect.".... That's wrong. Because you would truly understand the nature of the problem. And be able to prevent in the future.. or even warn other customers to not make the same "mistake"... You might not need any refund.. any new door.. simply you might just need transparent paint, which will reflect more photons, which will prevent from heating it up..

I am surprised by your comment. I was simply honest.. Don't you like honest people? what are your expectations from manufacturer of the door.. ? Questions what do you want from manufacturer are insulting you? How come? It appears so you want something (some action) from manufacturer, and they have no idea what do you want from them, and they have no idea how to fix it (probably never had such customer, search the net if somebody else complained prior you!).. (or they have exact idea that their door is crap product, and simply lying to you... but still there are questions: what do you want from them? what action? return of money? replacement?) Sorry, honestly, but nobody will do this investigation for you..

I agree. There is too few UV photons alone to cause such effect. Surely color of paint can decrease warming effect of the Sun, if you will use whitish (reflective) colour... It will be probably pointless. Because what do you expect? Replacement? Replacement to the same color door the most likely will end up the same effect as you have already.. Replacement to different color door? White? (It probably won't match other elements of house) Return of money? And then what you will have instead of door? There are paints which can change characteristics of how much surface is reflective or transmissive. https://en.wikipedia.org/wiki/Optical_coating If you could get access to IR camera, you could measure temperature of your door.. then paint a bit of it with some reflective (transparent) paint, and compare the next day whether that area has smaller temperature (on IR camera screen!)..

Example of "how not to teach"... Right now people could simply make photo using their smartphone (or even entire video), and not bother to rewrite what has been written on chalkboard anymore.. I laughed a lot while watching one sci-fi movie in which students sent their personal cameras to assembly hall, instead of attending personally. Cameras had rotation, following teacher movement, and were sending data through Internet to them, at home, without them bothering to walk to University building. The next scene - teacher did the same as students. Camera+screen with teacher + dozen of cameras of students+screens (with feedback image).

Many on-line internet shop are just catalogues (in the more or less percentage), what they can deliver. Not exactly what they have for real in warehouse. Basically, people see item on the page, they're interested, click "Buy Now", and then internet on-line shop is ordering that item from producer.. It's such optimization of required warehouse area. None the real off-line shop can beat it- they must have item in the shop so customers can immediately see it and get it with them. It would only work reliable like my above mentioned on-line catalogue.. Imagine: now fruits, vegetables, are cut from trees, plants, in advance, then delivered to shop, and they wait for customers. Some of them, if customers are not interested, or if demand for them is overestimated, are ending up in trash.. But if customer is clicking "buy", then can be cut from tree, or plant, in the moment of clicking. Exact amount of them is cut from trees, no more than needed. So there is no waste.

W3Schools is for learning HTML, CSS, and tiny tiny amount of JavaScript. PHP you should learn from php.net reference. The real computer programming is in C/C++/assembler..

It's misunderstanding. Proton-antiproton annihilates together. But annihilation branches are very complicated. It's not so simple case like with electron-positron annihilation. There are created intermediate particles: neutral pions, charged pions, rarely kaons. The most common decay mode of neutral pion is two gamma photons. But they have half of mass-energy of neutral pion (~67.5 MeV), not proton's mass-energy. I uploaded annihilation branches with their ratios (copied from yet another thread about this subject, where I initially uploaded these data from CERN): https://www.scienceforums.net/topic/112412-why-dont-proton-and-anti-proton-collisions-produce-3-neutral-pions/ (notice x-axis is non-linear scale!)

Why are you multiplying by e? When somebody wants to convert units from Joules to eV , he/she is dividing by e.. not multiply by e.. Like here: [math]\frac{m_e c^2}{e}[/math] [math]\frac{9.11*10^{-31} * 299792458^2}{1.602176565*10^{-19}} \approx 510998.928 eV[/math] Mass in SI is in kg, multiplied by (m/s)^2, gives you energy in kg*m^2*s^-2 which is J.. after dividing it by e, there is received energy in quantum physics unit of energy eV.. ps. Units must match.. Equations must match.. in the all of yours equations..

(as always) the best one (or the luckiest) from match day (repeat as many times as there is matches)..

dhimokritis, it would be easier to decipher what you mean, if you will start using LaTeX.. Read one of many threads about LaTeX https://www.scienceforums.net/topic/108127-typesetting-equations-with-latex-updated/ https://www.scienceforums.net/topic/3751-quick-latex-tutorial/ Why are you multiplying by e? What is c2?

Scientist-to-be make experiments, to gain knowledge, and experience. Failure might teach you more than success. Because you will have to repeat experiment. Why not try to put (blended?) mint leaves in sugar solution 1410.. ? Then distill it after two-tree weeks or so. It will cost as much as 1 kg of sugar. So if it won't have acceptable smell, you will throw it away.

You misunderstood my point. Mordred said rest-mass of particle must be calculated from observation of how particle reacts to applied external force (" In all cases the mass will be determined via experimentation with its relation to inertia ie mass is resistance to inertia change. "). I don't disagree with it. It's the most widely used method. It's good for stable charged particles. My point was that we are not required to use it (i.e. it's not the only way). Rest-mass of electron can be measured indirectly from measurement of gamma photon energy. In high-energy particles physics, particles have extremely short half-lives, 10^-12 s .... 10^-20 s and less. It's (at the moment) not possible to measure their rest-masses directly from inertia change. Rest-mass of such extremely unstable particles is measured indirectly from remains of their decay, instead of directly ultra-fast decaying particle (and its inertia change).

During annihilation of electron-positron there are created two gamma photons, which have 510998.928 eV energy each.. and it's exactly electron's Compton wavelength/frequency.. [math]e^- + e^+ \rightarrow \gamma + \gamma + 1.022 MeV[/math] [math]m_e c^2=\frac{h c}{\lambda_c}[/math] [math]\lambda_c =\frac{h c}{m_e c^2}[/math] [math]\lambda_c =\frac{h}{m_e c}[/math] [math]\lambda_c =\frac{6.62607004*10^{-34}}{9.11*10^{-31} * 299792458} \approx 2.42631 pm[/math] It's impossible to do the same with annihilation of proton-antiproton, as they don't annihilate straight to gamma photons..

If something computer-related does not work, restart it.. Restart both (unplug power for a while). How roku device is updating to newer version of software? Maybe one side updated, while second one didn't update to newer version of software, and cannot longer understand older data transmission. Just a thought. https://support.roku.com/en-gb/article/208755668-how-to-update-the-software-on-your-roku-streaming-device Personally I have satellite dish with HDD recorder with HDMI. It's trying to download newer software from satellite every day at 4 at night. I can imagine situation in which software has some nasty bug in auto-updating and installation procedure, which can render entire device useless.

You could explain that coal ores will be the all exhausted, sooner or later, and then what.. ? In the case of Solar energy, photons are produced by the Sun all the time, and will be for couple billions years more.. There will be exactly reverse problem- there will be more photons produced by the Sun, than Earth can handle it in the future.. The future generations of living organisms on the Earth will have to fight with too large radiation from the Sun, than now, to protect surface of the Earth, from entire vaporization..